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Sweden-Number/dlls/ntdll/signal_i386.c

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/*
* i386 signal handling routines
*
* Copyright 1999 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifdef __i386__
#include "config.h"
#include "wine/port.h"
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYSCALL_H
# include <syscall.h>
#else
# ifdef HAVE_SYS_SYSCALL_H
# include <sys/syscall.h>
# endif
#endif
#ifdef HAVE_SYS_SIGNAL_H
# include <sys/signal.h>
#endif
#ifdef HAVE_SYS_SYSCTL_H
# include <sys/sysctl.h>
#endif
#ifdef HAVE_SYS_UCONTEXT_H
# include <sys/ucontext.h>
#endif
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "wine/library.h"
#include "ntdll_misc.h"
#include "wine/exception.h"
#include "wine/debug.h"
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif
#undef ERR /* Solaris needs to define this */
WINE_DEFAULT_DEBUG_CHANNEL(seh);
WINE_DECLARE_DEBUG_CHANNEL(relay);
/* not defined for x86, so copy the x86_64 definition */
typedef struct DECLSPEC_ALIGN(16) _M128A
{
ULONGLONG Low;
LONGLONG High;
} M128A;
typedef struct
{
WORD ControlWord;
WORD StatusWord;
BYTE TagWord;
BYTE Reserved1;
WORD ErrorOpcode;
DWORD ErrorOffset;
WORD ErrorSelector;
WORD Reserved2;
DWORD DataOffset;
WORD DataSelector;
WORD Reserved3;
DWORD MxCsr;
DWORD MxCsr_Mask;
M128A FloatRegisters[8];
M128A XmmRegisters[16];
BYTE Reserved4[96];
} XMM_SAVE_AREA32;
/***********************************************************************
* signal context platform-specific definitions
*/
#ifdef __linux__
#ifndef HAVE_SYS_UCONTEXT_H
enum
{
REG_GS, REG_FS, REG_ES, REG_DS, REG_EDI, REG_ESI, REG_EBP, REG_ESP,
REG_EBX, REG_EDX, REG_ECX, REG_EAX, REG_TRAPNO, REG_ERR, REG_EIP,
REG_CS, REG_EFL, REG_UESP, REG_SS, NGREG
};
typedef int greg_t;
typedef greg_t gregset_t[NGREG];
struct _libc_fpreg
{
unsigned short significand[4];
unsigned short exponent;
};
struct _libc_fpstate
{
unsigned long cw;
unsigned long sw;
unsigned long tag;
unsigned long ipoff;
unsigned long cssel;
unsigned long dataoff;
unsigned long datasel;
struct _libc_fpreg _st[8];
unsigned long status;
};
typedef struct _libc_fpstate* fpregset_t;
typedef struct
{
gregset_t gregs;
fpregset_t fpregs;
unsigned long oldmask;
unsigned long cr2;
} mcontext_t;
typedef struct ucontext
{
unsigned long uc_flags;
struct ucontext *uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
sigset_t uc_sigmask;
} ucontext_t;
#endif /* HAVE_SYS_UCONTEXT_H */
#define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX])
#define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX])
#define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX])
#define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX])
#define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI])
#define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI])
#define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP])
#define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP])
#define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS])
#define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS])
#define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES])
#define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS])
#define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS])
#define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS])
#define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL])
#define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
#define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
#define FPUX_sig(context) (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL)
#ifdef __ANDROID__
/* custom signal restorer since we may have unmapped the one in vdso, and bionic doesn't check for that */
void rt_sigreturn(void);
__ASM_GLOBAL_FUNC( rt_sigreturn,
"movl $173,%eax\n\t" /* NR_rt_sigreturn */
"int $0x80" );
#endif
struct modify_ldt_s
{
unsigned int entry_number;
void *base_addr;
unsigned int limit;
unsigned int seg_32bit : 1;
unsigned int contents : 2;
unsigned int read_exec_only : 1;
unsigned int limit_in_pages : 1;
unsigned int seg_not_present : 1;
unsigned int usable : 1;
unsigned int garbage : 25;
};
static inline int modify_ldt( int func, struct modify_ldt_s *ptr, unsigned long count )
{
return syscall( 123 /* SYS_modify_ldt */, func, ptr, count );
}
static inline int set_thread_area( struct modify_ldt_s *ptr )
{
return syscall( 243 /* SYS_set_thread_area */, ptr );
}
#elif defined (__BSDI__)
#include <machine/frame.h>
typedef struct trapframe ucontext_t;
#define EAX_sig(context) ((context)->tf_eax)
#define EBX_sig(context) ((context)->tf_ebx)
#define ECX_sig(context) ((context)->tf_ecx)
#define EDX_sig(context) ((context)->tf_edx)
#define ESI_sig(context) ((context)->tf_esi)
#define EDI_sig(context) ((context)->tf_edi)
#define EBP_sig(context) ((context)->tf_ebp)
#define CS_sig(context) ((context)->tf_cs)
#define DS_sig(context) ((context)->tf_ds)
#define ES_sig(context) ((context)->tf_es)
#define SS_sig(context) ((context)->tf_ss)
#define EFL_sig(context) ((context)->tf_eflags)
#define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
#define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
#define FPU_sig(context) NULL /* FIXME */
#define FPUX_sig(context) NULL /* FIXME */
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
#include <machine/trap.h>
#include <machine/segments.h>
#include <machine/sysarch.h>
#define EAX_sig(context) ((context)->uc_mcontext.mc_eax)
#define EBX_sig(context) ((context)->uc_mcontext.mc_ebx)
#define ECX_sig(context) ((context)->uc_mcontext.mc_ecx)
#define EDX_sig(context) ((context)->uc_mcontext.mc_edx)
#define ESI_sig(context) ((context)->uc_mcontext.mc_esi)
#define EDI_sig(context) ((context)->uc_mcontext.mc_edi)
#define EBP_sig(context) ((context)->uc_mcontext.mc_ebp)
#define CS_sig(context) ((context)->uc_mcontext.mc_cs)
#define DS_sig(context) ((context)->uc_mcontext.mc_ds)
#define ES_sig(context) ((context)->uc_mcontext.mc_es)
#define FS_sig(context) ((context)->uc_mcontext.mc_fs)
#define GS_sig(context) ((context)->uc_mcontext.mc_gs)
#define SS_sig(context) ((context)->uc_mcontext.mc_ss)
#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
#define EFL_sig(context) ((context)->uc_mcontext.mc_eflags)
#define EIP_sig(context) ((context)->uc_mcontext.mc_eip)
#define ESP_sig(context) ((context)->uc_mcontext.mc_esp)
#define FPU_sig(context) NULL /* FIXME */
#define FPUX_sig(context) NULL /* FIXME */
#elif defined (__OpenBSD__)
#include <machine/segments.h>
#include <machine/sysarch.h>
#define EAX_sig(context) ((context)->sc_eax)
#define EBX_sig(context) ((context)->sc_ebx)
#define ECX_sig(context) ((context)->sc_ecx)
#define EDX_sig(context) ((context)->sc_edx)
#define ESI_sig(context) ((context)->sc_esi)
#define EDI_sig(context) ((context)->sc_edi)
#define EBP_sig(context) ((context)->sc_ebp)
#define CS_sig(context) ((context)->sc_cs)
#define DS_sig(context) ((context)->sc_ds)
#define ES_sig(context) ((context)->sc_es)
#define FS_sig(context) ((context)->sc_fs)
#define GS_sig(context) ((context)->sc_gs)
#define SS_sig(context) ((context)->sc_ss)
#define TRAP_sig(context) ((context)->sc_trapno)
#define ERROR_sig(context) ((context)->sc_err)
#define EFL_sig(context) ((context)->sc_eflags)
#define EIP_sig(context) ((context)->sc_eip)
#define ESP_sig(context) ((context)->sc_esp)
#define FPU_sig(context) NULL /* FIXME */
#define FPUX_sig(context) NULL /* FIXME */
#define T_MCHK T_MACHK
#define T_XMMFLT T_XFTRAP
#elif defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
#if defined(_SCO_DS) || defined(__sun)
#include <sys/regset.h>
#endif
#ifdef _SCO_DS
#define gregs regs
#endif
#define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
#define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
#define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
#define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
#define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
#define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
#define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
#define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
#define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
#define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
#define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
#define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
#define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
#define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
#define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
#ifdef UESP
#define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
#elif defined(R_ESP)
#define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
#else
#define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
#endif
#ifdef ERR
#define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR])
#endif
#ifdef TRAPNO
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
#endif
#define FPU_sig(context) NULL /* FIXME */
#define FPUX_sig(context) NULL /* FIXME */
#elif defined (__APPLE__)
#include <i386/user_ldt.h>
/* work around silly renaming of struct members in OS X 10.5 */
#if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
#define EAX_sig(context) ((context)->uc_mcontext->__ss.__eax)
#define EBX_sig(context) ((context)->uc_mcontext->__ss.__ebx)
#define ECX_sig(context) ((context)->uc_mcontext->__ss.__ecx)
#define EDX_sig(context) ((context)->uc_mcontext->__ss.__edx)
#define ESI_sig(context) ((context)->uc_mcontext->__ss.__esi)
#define EDI_sig(context) ((context)->uc_mcontext->__ss.__edi)
#define EBP_sig(context) ((context)->uc_mcontext->__ss.__ebp)
#define CS_sig(context) ((context)->uc_mcontext->__ss.__cs)
#define DS_sig(context) ((context)->uc_mcontext->__ss.__ds)
#define ES_sig(context) ((context)->uc_mcontext->__ss.__es)
#define FS_sig(context) ((context)->uc_mcontext->__ss.__fs)
#define GS_sig(context) ((context)->uc_mcontext->__ss.__gs)
#define SS_sig(context) ((context)->uc_mcontext->__ss.__ss)
#define EFL_sig(context) ((context)->uc_mcontext->__ss.__eflags)
#define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip))
#define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp))
#define TRAP_sig(context) ((context)->uc_mcontext->__es.__trapno)
#define ERROR_sig(context) ((context)->uc_mcontext->__es.__err)
#define FPU_sig(context) NULL
#define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
#else
#define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
#define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
#define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
#define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
#define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
#define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
#define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
#define CS_sig(context) ((context)->uc_mcontext->ss.cs)
#define DS_sig(context) ((context)->uc_mcontext->ss.ds)
#define ES_sig(context) ((context)->uc_mcontext->ss.es)
#define FS_sig(context) ((context)->uc_mcontext->ss.fs)
#define GS_sig(context) ((context)->uc_mcontext->ss.gs)
#define SS_sig(context) ((context)->uc_mcontext->ss.ss)
#define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
#define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
#define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
#define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
#define ERROR_sig(context) ((context)->uc_mcontext->es.err)
#define FPU_sig(context) NULL
#define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
#endif
#elif defined(__NetBSD__)
#include <machine/segments.h>
#include <machine/sysarch.h>
#define EAX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EAX])
#define EBX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBX])
#define ECX_sig(context) ((context)->uc_mcontext.__gregs[_REG_ECX])
#define EDX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDX])
#define ESI_sig(context) ((context)->uc_mcontext.__gregs[_REG_ESI])
#define EDI_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDI])
#define EBP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBP])
#define ESP_sig(context) _UC_MACHINE_SP(context)
#define CS_sig(context) ((context)->uc_mcontext.__gregs[_REG_CS])
#define DS_sig(context) ((context)->uc_mcontext.__gregs[_REG_DS])
#define ES_sig(context) ((context)->uc_mcontext.__gregs[_REG_ES])
#define SS_sig(context) ((context)->uc_mcontext.__gregs[_REG_SS])
#define FS_sig(context) ((context)->uc_mcontext.__gregs[_REG_FS])
#define GS_sig(context) ((context)->uc_mcontext.__gregs[_REG_GS])
#define EFL_sig(context) ((context)->uc_mcontext.__gregs[_REG_EFL])
#define EIP_sig(context) _UC_MACHINE_PC(context)
#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
#define FPU_sig(context) NULL
#define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&((context)->uc_mcontext.__fpregs))
#define T_MCHK T_MCA
#define T_XMMFLT T_XMM
#elif defined(__GNU__)
#include <mach/i386/mach_i386.h>
#include <mach/mach_traps.h>
#define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX])
#define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX])
#define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX])
#define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX])
#define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI])
#define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI])
#define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP])
#define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP])
#define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS])
#define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS])
#define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES])
#define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS])
#define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS])
#define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS])
#define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL])
#define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
#define FPU_sig(context) ((FLOATING_SAVE_AREA *)&(context)->uc_mcontext.fpregs.fp_reg_set.fpchip_state)
#define FPUX_sig(context) NULL
#else
#error You must define the signal context functions for your platform
#endif /* linux */
/* stack layout when calling an exception raise function */
struct stack_layout
{
void *ret_addr; /* return address from raise_generic_exception */
EXCEPTION_RECORD *rec_ptr; /* first arg for raise_generic_exception */
CONTEXT *context_ptr; /* second arg for raise_generic_exception */
CONTEXT context;
EXCEPTION_RECORD rec;
DWORD ebp;
DWORD eip;
};
typedef int (*wine_signal_handler)(unsigned int sig);
static const size_t teb_size = 4096; /* we reserve one page for the TEB */
static size_t signal_stack_mask;
static size_t signal_stack_size;
static ULONG first_ldt_entry = 32;
static wine_signal_handler handlers[256];
enum i386_trap_code
{
TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
#if defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
TRAP_x86_NMI = T_NMI, /* NMI interrupt */
TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
TRAP_x86_DNA = T_DNA, /* Device not available exception */
TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
#else
TRAP_x86_DIVIDE = 0, /* Division by zero exception */
TRAP_x86_TRCTRAP = 1, /* Single-step exception */
TRAP_x86_NMI = 2, /* NMI interrupt */
TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
TRAP_x86_OFLOW = 4, /* Overflow exception */
TRAP_x86_BOUND = 5, /* Bound range exception */
TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
TRAP_x86_DNA = 7, /* Device not available exception */
TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
TRAP_x86_STKFLT = 12, /* Stack fault */
TRAP_x86_PROTFLT = 13, /* General protection fault */
TRAP_x86_PAGEFLT = 14, /* Page fault */
TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
TRAP_x86_MCHK = 18, /* Machine check exception */
TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable
otherwise Cache flush exception (via SIGSEV) */
#endif
};
struct x86_thread_data
{
DWORD fs; /* 1d4 TEB selector */
DWORD gs; /* 1d8 libc selector; update winebuild if you move this! */
DWORD dr0; /* 1dc debug registers */
DWORD dr1; /* 1e0 */
DWORD dr2; /* 1e4 */
DWORD dr3; /* 1e8 */
DWORD dr6; /* 1ec */
DWORD dr7; /* 1f0 */
void *exit_frame; /* 1f4 exit frame pointer */
/* the ntdll_thread_data structure follows here */
};
C_ASSERT( offsetof( TEB, SystemReserved2 ) + offsetof( struct x86_thread_data, gs ) == 0x1d8 );
C_ASSERT( offsetof( TEB, SystemReserved2 ) + offsetof( struct x86_thread_data, exit_frame ) == 0x1f4 );
static inline struct x86_thread_data *x86_thread_data(void)
{
return (struct x86_thread_data *)NtCurrentTeb()->SystemReserved2;
}
static inline WORD get_cs(void) { WORD res; __asm__( "movw %%cs,%0" : "=r" (res) ); return res; }
static inline WORD get_ds(void) { WORD res; __asm__( "movw %%ds,%0" : "=r" (res) ); return res; }
static inline WORD get_fs(void) { WORD res; __asm__( "movw %%fs,%0" : "=r" (res) ); return res; }
static inline WORD get_gs(void) { WORD res; __asm__( "movw %%gs,%0" : "=r" (res) ); return res; }
static inline void set_fs( WORD val ) { __asm__( "mov %0,%%fs" :: "r" (val)); }
static inline void set_gs( WORD val ) { __asm__( "mov %0,%%gs" :: "r" (val)); }
/* Exception record for handling exceptions happening inside exception handlers */
typedef struct
{
EXCEPTION_REGISTRATION_RECORD frame;
EXCEPTION_REGISTRATION_RECORD *prevFrame;
} EXC_NESTED_FRAME;
extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler );
/***********************************************************************
* is_gdt_sel
*/
static inline int is_gdt_sel( WORD sel )
{
return !(sel & 4);
}
/***********************************************************************
* ldt_is_system
*/
static inline int ldt_is_system( WORD sel )
{
return is_gdt_sel( sel ) || ((sel >> 3) < first_ldt_entry);
}
/***********************************************************************
* dispatch_signal
*/
static inline int dispatch_signal(unsigned int sig)
{
if (handlers[sig] == NULL) return 0;
return handlers[sig](sig);
}
/***********************************************************************
* get_trap_code
*
* Get the trap code for a signal.
*/
static inline enum i386_trap_code get_trap_code( const ucontext_t *sigcontext )
{
#ifdef TRAP_sig
return TRAP_sig(sigcontext);
#else
return TRAP_x86_UNKNOWN; /* unknown trap code */
#endif
}
/***********************************************************************
* get_error_code
*
* Get the error code for a signal.
*/
static inline WORD get_error_code( const ucontext_t *sigcontext )
{
#ifdef ERROR_sig
return ERROR_sig(sigcontext);
#else
return 0;
#endif
}
/***********************************************************************
* get_signal_stack
*
* Get the base of the signal stack for the current thread.
*/
static inline void *get_signal_stack(void)
{
return (char *)NtCurrentTeb() + 4096;
}
/***********************************************************************
* has_fpux
*/
static inline int has_fpux(void)
{
return (cpu_info.FeatureSet & CPU_FEATURE_FXSR);
}
/***********************************************************************
* get_current_teb
*
* Get the current teb based on the stack pointer.
*/
static inline TEB *get_current_teb(void)
{
unsigned long esp;
__asm__("movl %%esp,%0" : "=g" (esp) );
return (TEB *)(esp & ~signal_stack_mask);
}
/*******************************************************************
* is_valid_frame
*/
static inline BOOL is_valid_frame( void *frame )
{
if ((ULONG_PTR)frame & 3) return FALSE;
return (frame >= NtCurrentTeb()->Tib.StackLimit &&
(void **)frame < (void **)NtCurrentTeb()->Tib.StackBase - 1);
}
/*******************************************************************
* raise_handler
*
* Handler for exceptions happening inside a handler.
*/
static DWORD raise_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
return ExceptionContinueSearch;
/* We shouldn't get here so we store faulty frame in dispatcher */
*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
return ExceptionNestedException;
}
/*******************************************************************
* unwind_handler
*
* Handler for exceptions happening inside an unwind handler.
*/
static DWORD unwind_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
return ExceptionContinueSearch;
/* We shouldn't get here so we store faulty frame in dispatcher */
*dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
return ExceptionCollidedUnwind;
}
/**********************************************************************
* call_stack_handlers
*
* Call the stack handlers chain.
*/
static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
{
EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
DWORD res;
frame = NtCurrentTeb()->Tib.ExceptionList;
nested_frame = NULL;
while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
{
/* Check frame address */
if (!is_valid_frame( frame ))
{
rec->ExceptionFlags |= EH_STACK_INVALID;
break;
}
/* Call handler */
TRACE( "calling handler at %p code=%x flags=%x\n",
frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, raise_handler );
TRACE( "handler at %p returned %x\n", frame->Handler, res );
if (frame == nested_frame)
{
/* no longer nested */
nested_frame = NULL;
rec->ExceptionFlags &= ~EH_NESTED_CALL;
}
switch(res)
{
case ExceptionContinueExecution:
if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
return STATUS_NONCONTINUABLE_EXCEPTION;
case ExceptionContinueSearch:
break;
case ExceptionNestedException:
if (nested_frame < dispatch) nested_frame = dispatch;
rec->ExceptionFlags |= EH_NESTED_CALL;
break;
default:
return STATUS_INVALID_DISPOSITION;
}
frame = frame->Prev;
}
return STATUS_UNHANDLED_EXCEPTION;
}
/*******************************************************************
* raise_exception
*
* Implementation of NtRaiseException.
*/
static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
{
NTSTATUS status;
if (first_chance)
{
DWORD c;
TRACE( "code=%x flags=%x addr=%p ip=%08x tid=%04x\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
context->Eip, GetCurrentThreadId() );
for (c = 0; c < rec->NumberParameters; c++)
TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
{
if (rec->ExceptionInformation[1] >> 16)
MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
rec->ExceptionAddress,
(char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
else
MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
rec->ExceptionAddress,
(char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
}
else
{
TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
context->Eax, context->Ebx, context->Ecx,
context->Edx, context->Esi, context->Edi );
TRACE(" ebp=%08x esp=%08x cs=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
context->Ebp, context->Esp, context->SegCs, context->SegDs,
context->SegEs, context->SegFs, context->SegGs, context->EFlags );
}
/* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION) goto done;
if ((status = call_stack_handlers( rec, context )) == STATUS_SUCCESS) goto done;
if (status != STATUS_UNHANDLED_EXCEPTION) return status;
}
/* last chance exception */
status = send_debug_event( rec, FALSE, context );
if (status != DBG_CONTINUE)
{
if (rec->ExceptionFlags & EH_STACK_INVALID)
WINE_ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
WINE_ERR("Process attempted to continue execution after noncontinuable exception.\n");
else
WINE_ERR("Unhandled exception code %x flags %x addr %p\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
}
done:
return NtSetContextThread( GetCurrentThread(), context );
}
#ifdef __sun
/* We have to workaround two Solaris breakages:
* - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
* code crash badly.
* - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
* are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
*/
extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
__ASM_GLOBAL_FUNC( sigaction_syscall,
"movl $0x62,%eax\n\t"
"int $0x91\n\t"
"ret" )
/* assume the same libc handler is used for all signals */
static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );
static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
{
struct x86_thread_data *thread_data;
__asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");
thread_data = (struct x86_thread_data *)get_current_teb()->SystemReserved2;
set_fs( thread_data->fs );
set_gs( thread_data->gs );
libc_sigacthandler( signal, siginfo, sigcontext );
}
static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
{
struct sigaction real_act;
if (sigaction( sig, new, old ) == -1) return -1;
/* retrieve the real handler and flags with a direct syscall */
sigaction_syscall( sig, NULL, &real_act );
libc_sigacthandler = real_act.sa_sigaction;
real_act.sa_sigaction = wine_sigacthandler;
sigaction_syscall( sig, &real_act, NULL );
return 0;
}
#define sigaction(sig,new,old) solaris_sigaction(sig,new,old)
#endif
extern void clear_alignment_flag(void);
__ASM_GLOBAL_FUNC( clear_alignment_flag,
"pushfl\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"andl $~0x40000,(%esp)\n\t"
"popfl\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
"ret" )
/***********************************************************************
* init_handler
*
* Handler initialization when the full context is not needed.
* Return the stack pointer to use for pushing the exception data.
*/
static inline void *init_handler( const ucontext_t *sigcontext, WORD *fs, WORD *gs )
{
TEB *teb = get_current_teb();
clear_alignment_flag();
/* get %fs and %gs at time of the fault */
#ifdef FS_sig
*fs = LOWORD(FS_sig(sigcontext));
#else
*fs = get_fs();
#endif
#ifdef GS_sig
*gs = LOWORD(GS_sig(sigcontext));
#else
*gs = get_gs();
#endif
#ifndef __sun /* see above for Solaris handling */
{
struct x86_thread_data *thread_data = (struct x86_thread_data *)teb->SystemReserved2;
set_fs( thread_data->fs );
set_gs( thread_data->gs );
}
#endif
if (!ldt_is_system(CS_sig(sigcontext)) || !ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
{
/*
* Win16 or DOS protected mode. Note that during switch
* from 16-bit mode to linear mode, CS may be set to system
* segment before FS is restored. Fortunately, in this case
* SS is still non-system segment. This is why both CS and SS
* are checked.
*/
return teb->WOW32Reserved;
}
return (void *)(ESP_sig(sigcontext) & ~3);
}
/***********************************************************************
* save_fpu
*
* Save the thread FPU context.
*/
static inline void save_fpu( CONTEXT *context )
{
#ifdef __GNUC__
struct
{
DWORD ControlWord;
DWORD StatusWord;
DWORD TagWord;
DWORD ErrorOffset;
DWORD ErrorSelector;
DWORD DataOffset;
DWORD DataSelector;
}
float_status;
context->ContextFlags |= CONTEXT_FLOATING_POINT;
__asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
/* Reset unmasked exceptions status to avoid firing an exception. */
memcpy(&float_status, &context->FloatSave, sizeof(float_status));
float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
__asm__ __volatile__( "fldenv %0" : : "m" (float_status) );
#endif
}
/***********************************************************************
* save_fpux
*
* Save the thread FPU extended context.
*/
static inline void save_fpux( CONTEXT *context )
{
#ifdef __GNUC__
/* we have to enforce alignment by hand */
char buffer[sizeof(XMM_SAVE_AREA32) + 16];
XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
if (!has_fpux()) return;
context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
__asm__ __volatile__( "fxsave %0" : "=m" (*state) );
memcpy( context->ExtendedRegisters, state, sizeof(*state) );
#endif
}
/***********************************************************************
* restore_fpu
*
* Restore the FPU context to a sigcontext.
*/
static inline void restore_fpu( const CONTEXT *context )
{
FLOATING_SAVE_AREA float_status = context->FloatSave;
/* reset the current interrupt status */
float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
#ifdef __GNUC__
__asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
#endif /* __GNUC__ */
}
/***********************************************************************
* restore_fpux
*
* Restore the FPU extended context to a sigcontext.
*/
static inline void restore_fpux( const CONTEXT *context )
{
#ifdef __GNUC__
/* we have to enforce alignment by hand */
char buffer[sizeof(XMM_SAVE_AREA32) + 16];
XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
memcpy( state, context->ExtendedRegisters, sizeof(*state) );
/* reset the current interrupt status */
state->StatusWord &= state->ControlWord | 0xff80;
__asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
#endif
}
/***********************************************************************
* fpux_to_fpu
*
* Build a standard FPU context from an extended one.
*/
static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
{
unsigned int i, tag, stack_top;
fpu->ControlWord = fpux->ControlWord | 0xffff0000;
fpu->StatusWord = fpux->StatusWord | 0xffff0000;
fpu->ErrorOffset = fpux->ErrorOffset;
fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
fpu->DataOffset = fpux->DataOffset;
fpu->DataSelector = fpux->DataSelector;
fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
stack_top = (fpux->StatusWord >> 11) & 7;
fpu->TagWord = 0xffff0000;
for (i = 0; i < 8; i++)
{
memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
else
{
const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
{
tag = 2; /* special */
}
else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
{
if (reg->Low) tag = 2; /* special */
else tag = 1; /* zero */
}
else
{
if (reg->Low >> 63) tag = 0; /* valid */
else tag = 2; /* special */
}
}
fpu->TagWord |= tag << (2 * i);
}
}
/***********************************************************************
* save_context
*
* Build a context structure from the signal info.
*/
static inline void save_context( CONTEXT *context, const ucontext_t *sigcontext, WORD fs, WORD gs )
{
FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
memset(context, 0, sizeof(*context));
context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
context->Eax = EAX_sig(sigcontext);
context->Ebx = EBX_sig(sigcontext);
context->Ecx = ECX_sig(sigcontext);
context->Edx = EDX_sig(sigcontext);
context->Esi = ESI_sig(sigcontext);
context->Edi = EDI_sig(sigcontext);
context->Ebp = EBP_sig(sigcontext);
context->EFlags = EFL_sig(sigcontext);
context->Eip = EIP_sig(sigcontext);
context->Esp = ESP_sig(sigcontext);
context->SegCs = LOWORD(CS_sig(sigcontext));
context->SegDs = LOWORD(DS_sig(sigcontext));
context->SegEs = LOWORD(ES_sig(sigcontext));
context->SegFs = fs;
context->SegGs = gs;
context->SegSs = LOWORD(SS_sig(sigcontext));
context->Dr0 = x86_thread_data()->dr0;
context->Dr1 = x86_thread_data()->dr1;
context->Dr2 = x86_thread_data()->dr2;
context->Dr3 = x86_thread_data()->dr3;
context->Dr6 = x86_thread_data()->dr6;
context->Dr7 = x86_thread_data()->dr7;
if (fpu)
{
context->ContextFlags |= CONTEXT_FLOATING_POINT;
context->FloatSave = *fpu;
}
if (fpux)
{
context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
}
if (!fpu && !fpux) save_fpu( context );
}
/***********************************************************************
* restore_context
*
* Restore the signal info from the context.
*/
static inline void restore_context( const CONTEXT *context, ucontext_t *sigcontext )
{
FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
x86_thread_data()->dr0 = context->Dr0;
x86_thread_data()->dr1 = context->Dr1;
x86_thread_data()->dr2 = context->Dr2;
x86_thread_data()->dr3 = context->Dr3;
x86_thread_data()->dr6 = context->Dr6;
x86_thread_data()->dr7 = context->Dr7;
EAX_sig(sigcontext) = context->Eax;
EBX_sig(sigcontext) = context->Ebx;
ECX_sig(sigcontext) = context->Ecx;
EDX_sig(sigcontext) = context->Edx;
ESI_sig(sigcontext) = context->Esi;
EDI_sig(sigcontext) = context->Edi;
EBP_sig(sigcontext) = context->Ebp;
EFL_sig(sigcontext) = context->EFlags;
EIP_sig(sigcontext) = context->Eip;
ESP_sig(sigcontext) = context->Esp;
CS_sig(sigcontext) = context->SegCs;
DS_sig(sigcontext) = context->SegDs;
ES_sig(sigcontext) = context->SegEs;
SS_sig(sigcontext) = context->SegSs;
#ifdef GS_sig
GS_sig(sigcontext) = context->SegGs;
#else
set_gs( context->SegGs );
#endif
#ifdef FS_sig
FS_sig(sigcontext) = context->SegFs;
#else
set_fs( context->SegFs );
#endif
if (fpu) *fpu = context->FloatSave;
if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
if (!fpu && !fpux) restore_fpu( context );
}
/***********************************************************************
* RtlCaptureContext (NTDLL.@)
*/
__ASM_STDCALL_FUNC( RtlCaptureContext, 4,
"pushl %eax\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"movl 8(%esp),%eax\n\t" /* context */
"movl $0x10007,(%eax)\n\t" /* context->ContextFlags */
"movw %gs,0x8c(%eax)\n\t" /* context->SegGs */
"movw %fs,0x90(%eax)\n\t" /* context->SegFs */
"movw %es,0x94(%eax)\n\t" /* context->SegEs */
"movw %ds,0x98(%eax)\n\t" /* context->SegDs */
"movl %edi,0x9c(%eax)\n\t" /* context->Edi */
"movl %esi,0xa0(%eax)\n\t" /* context->Esi */
"movl %ebx,0xa4(%eax)\n\t" /* context->Ebx */
"movl %edx,0xa8(%eax)\n\t" /* context->Edx */
"movl %ecx,0xac(%eax)\n\t" /* context->Ecx */
"movl 0(%ebp),%edx\n\t"
"movl %edx,0xb4(%eax)\n\t" /* context->Ebp */
"movl 4(%ebp),%edx\n\t"
"movl %edx,0xb8(%eax)\n\t" /* context->Eip */
"movw %cs,0xbc(%eax)\n\t" /* context->SegCs */
"pushfl\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"popl 0xc0(%eax)\n\t" /* context->EFlags */
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
"leal 8(%ebp),%edx\n\t"
"movl %edx,0xc4(%eax)\n\t" /* context->Esp */
"movw %ss,0xc8(%eax)\n\t" /* context->SegSs */
"popl 0xb0(%eax)\n\t" /* context->Eax */
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
"ret $4" )
/***********************************************************************
* set_full_cpu_context
*
* Set the new CPU context.
*/
extern void set_full_cpu_context( const CONTEXT *context );
__ASM_GLOBAL_FUNC( set_full_cpu_context,
"movl 4(%esp),%ecx\n\t"
"movw 0x8c(%ecx),%gs\n\t" /* SegGs */
"movw 0x90(%ecx),%fs\n\t" /* SegFs */
"movw 0x94(%ecx),%es\n\t" /* SegEs */
"movl 0x9c(%ecx),%edi\n\t" /* Edi */
"movl 0xa0(%ecx),%esi\n\t" /* Esi */
"movl 0xa4(%ecx),%ebx\n\t" /* Ebx */
"movl 0xb4(%ecx),%ebp\n\t" /* Ebp */
"movw %ss,%ax\n\t"
"cmpw 0xc8(%ecx),%ax\n\t" /* SegSs */
"jne 1f\n\t"
/* As soon as we have switched stacks the context structure could
* be invalid (when signal handlers are executed for example). Copy
* values on the target stack before changing ESP. */
"movl 0xc4(%ecx),%eax\n\t" /* Esp */
"leal -4*4(%eax),%eax\n\t"
"movl 0xc0(%ecx),%edx\n\t" /* EFlags */
"movl %edx,3*4(%eax)\n\t"
"movl 0xbc(%ecx),%edx\n\t" /* SegCs */
"movl %edx,2*4(%eax)\n\t"
"movl 0xb8(%ecx),%edx\n\t" /* Eip */
"movl %edx,1*4(%eax)\n\t"
"movl 0xb0(%ecx),%edx\n\t" /* Eax */
"movl %edx,0*4(%eax)\n\t"
"pushl 0x98(%ecx)\n\t" /* SegDs */
"movl 0xa8(%ecx),%edx\n\t" /* Edx */
"movl 0xac(%ecx),%ecx\n\t" /* Ecx */
"popl %ds\n\t"
"movl %eax,%esp\n\t"
"popl %eax\n\t"
"iret\n"
/* Restore the context when the stack segment changes. We can't use
* the same code as above because we do not know if the stack segment
* is 16 or 32 bit, and 'movl' will throw an exception when we try to
* access memory above the limit. */
"1:\n\t"
"movl 0xa8(%ecx),%edx\n\t" /* Edx */
"movl 0xb0(%ecx),%eax\n\t" /* Eax */
"movw 0xc8(%ecx),%ss\n\t" /* SegSs */
"movl 0xc4(%ecx),%esp\n\t" /* Esp */
"pushl 0xc0(%ecx)\n\t" /* EFlags */
"pushl 0xbc(%ecx)\n\t" /* SegCs */
"pushl 0xb8(%ecx)\n\t" /* Eip */
"pushl 0x98(%ecx)\n\t" /* SegDs */
"movl 0xac(%ecx),%ecx\n\t" /* Ecx */
"popl %ds\n\t"
"iret" )
/***********************************************************************
* set_cpu_context
*
* Set the new CPU context. Used by NtSetContextThread.
*/
void DECLSPEC_HIDDEN set_cpu_context( const CONTEXT *context )
{
DWORD flags = context->ContextFlags & ~CONTEXT_i386;
if ((flags & CONTEXT_EXTENDED_REGISTERS) && has_fpux()) restore_fpux( context );
else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
if (flags & CONTEXT_DEBUG_REGISTERS)
{
x86_thread_data()->dr0 = context->Dr0;
x86_thread_data()->dr1 = context->Dr1;
x86_thread_data()->dr2 = context->Dr2;
x86_thread_data()->dr3 = context->Dr3;
x86_thread_data()->dr6 = context->Dr6;
x86_thread_data()->dr7 = context->Dr7;
}
if (flags & CONTEXT_FULL)
{
if (!(flags & CONTEXT_CONTROL))
FIXME( "setting partial context (%x) not supported\n", flags );
else if (flags & CONTEXT_SEGMENTS)
set_full_cpu_context( context );
else
{
CONTEXT newcontext = *context;
newcontext.SegDs = get_ds();
newcontext.SegEs = get_ds();
newcontext.SegFs = get_fs();
newcontext.SegGs = get_gs();
set_full_cpu_context( &newcontext );
}
}
}
/***********************************************************************
* get_server_context_flags
*
* Convert CPU-specific flags to generic server flags
*/
static unsigned int get_server_context_flags( DWORD flags )
{
unsigned int ret = 0;
flags &= ~CONTEXT_i386; /* get rid of CPU id */
if (flags & CONTEXT_CONTROL) ret |= SERVER_CTX_CONTROL;
if (flags & CONTEXT_INTEGER) ret |= SERVER_CTX_INTEGER;
if (flags & CONTEXT_SEGMENTS) ret |= SERVER_CTX_SEGMENTS;
if (flags & CONTEXT_FLOATING_POINT) ret |= SERVER_CTX_FLOATING_POINT;
if (flags & CONTEXT_DEBUG_REGISTERS) ret |= SERVER_CTX_DEBUG_REGISTERS;
if (flags & CONTEXT_EXTENDED_REGISTERS) ret |= SERVER_CTX_EXTENDED_REGISTERS;
return ret;
}
/***********************************************************************
* context_to_server
*
* Convert a register context to the server format.
*/
NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
{
DWORD flags = from->ContextFlags & ~CONTEXT_i386; /* get rid of CPU id */
memset( to, 0, sizeof(*to) );
to->cpu = CPU_x86;
if (flags & CONTEXT_CONTROL)
{
to->flags |= SERVER_CTX_CONTROL;
to->ctl.i386_regs.ebp = from->Ebp;
to->ctl.i386_regs.esp = from->Esp;
to->ctl.i386_regs.eip = from->Eip;
to->ctl.i386_regs.cs = from->SegCs;
to->ctl.i386_regs.ss = from->SegSs;
to->ctl.i386_regs.eflags = from->EFlags;
}
if (flags & CONTEXT_INTEGER)
{
to->flags |= SERVER_CTX_INTEGER;
to->integer.i386_regs.eax = from->Eax;
to->integer.i386_regs.ebx = from->Ebx;
to->integer.i386_regs.ecx = from->Ecx;
to->integer.i386_regs.edx = from->Edx;
to->integer.i386_regs.esi = from->Esi;
to->integer.i386_regs.edi = from->Edi;
}
if (flags & CONTEXT_SEGMENTS)
{
to->flags |= SERVER_CTX_SEGMENTS;
to->seg.i386_regs.ds = from->SegDs;
to->seg.i386_regs.es = from->SegEs;
to->seg.i386_regs.fs = from->SegFs;
to->seg.i386_regs.gs = from->SegGs;
}
if (flags & CONTEXT_FLOATING_POINT)
{
to->flags |= SERVER_CTX_FLOATING_POINT;
to->fp.i386_regs.ctrl = from->FloatSave.ControlWord;
to->fp.i386_regs.status = from->FloatSave.StatusWord;
to->fp.i386_regs.tag = from->FloatSave.TagWord;
to->fp.i386_regs.err_off = from->FloatSave.ErrorOffset;
to->fp.i386_regs.err_sel = from->FloatSave.ErrorSelector;
to->fp.i386_regs.data_off = from->FloatSave.DataOffset;
to->fp.i386_regs.data_sel = from->FloatSave.DataSelector;
to->fp.i386_regs.cr0npx = from->FloatSave.Cr0NpxState;
memcpy( to->fp.i386_regs.regs, from->FloatSave.RegisterArea, sizeof(to->fp.i386_regs.regs) );
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
to->flags |= SERVER_CTX_DEBUG_REGISTERS;
to->debug.i386_regs.dr0 = from->Dr0;
to->debug.i386_regs.dr1 = from->Dr1;
to->debug.i386_regs.dr2 = from->Dr2;
to->debug.i386_regs.dr3 = from->Dr3;
to->debug.i386_regs.dr6 = from->Dr6;
to->debug.i386_regs.dr7 = from->Dr7;
}
if (flags & CONTEXT_EXTENDED_REGISTERS)
{
to->flags |= SERVER_CTX_EXTENDED_REGISTERS;
memcpy( to->ext.i386_regs, from->ExtendedRegisters, sizeof(to->ext.i386_regs) );
}
return STATUS_SUCCESS;
}
/***********************************************************************
* context_from_server
*
* Convert a register context from the server format.
*/
NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
{
if (from->cpu != CPU_x86) return STATUS_INVALID_PARAMETER;
to->ContextFlags = CONTEXT_i386;
if (from->flags & SERVER_CTX_CONTROL)
{
to->ContextFlags |= CONTEXT_CONTROL;
to->Ebp = from->ctl.i386_regs.ebp;
to->Esp = from->ctl.i386_regs.esp;
to->Eip = from->ctl.i386_regs.eip;
to->SegCs = from->ctl.i386_regs.cs;
to->SegSs = from->ctl.i386_regs.ss;
to->EFlags = from->ctl.i386_regs.eflags;
}
if (from->flags & SERVER_CTX_INTEGER)
{
to->ContextFlags |= CONTEXT_INTEGER;
to->Eax = from->integer.i386_regs.eax;
to->Ebx = from->integer.i386_regs.ebx;
to->Ecx = from->integer.i386_regs.ecx;
to->Edx = from->integer.i386_regs.edx;
to->Esi = from->integer.i386_regs.esi;
to->Edi = from->integer.i386_regs.edi;
}
if (from->flags & SERVER_CTX_SEGMENTS)
{
to->ContextFlags |= CONTEXT_SEGMENTS;
to->SegDs = from->seg.i386_regs.ds;
to->SegEs = from->seg.i386_regs.es;
to->SegFs = from->seg.i386_regs.fs;
to->SegGs = from->seg.i386_regs.gs;
}
if (from->flags & SERVER_CTX_FLOATING_POINT)
{
to->ContextFlags |= CONTEXT_FLOATING_POINT;
to->FloatSave.ControlWord = from->fp.i386_regs.ctrl;
to->FloatSave.StatusWord = from->fp.i386_regs.status;
to->FloatSave.TagWord = from->fp.i386_regs.tag;
to->FloatSave.ErrorOffset = from->fp.i386_regs.err_off;
to->FloatSave.ErrorSelector = from->fp.i386_regs.err_sel;
to->FloatSave.DataOffset = from->fp.i386_regs.data_off;
to->FloatSave.DataSelector = from->fp.i386_regs.data_sel;
to->FloatSave.Cr0NpxState = from->fp.i386_regs.cr0npx;
memcpy( to->FloatSave.RegisterArea, from->fp.i386_regs.regs, sizeof(to->FloatSave.RegisterArea) );
}
if (from->flags & SERVER_CTX_DEBUG_REGISTERS)
{
to->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
to->Dr0 = from->debug.i386_regs.dr0;
to->Dr1 = from->debug.i386_regs.dr1;
to->Dr2 = from->debug.i386_regs.dr2;
to->Dr3 = from->debug.i386_regs.dr3;
to->Dr6 = from->debug.i386_regs.dr6;
to->Dr7 = from->debug.i386_regs.dr7;
}
if (from->flags & SERVER_CTX_EXTENDED_REGISTERS)
{
to->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
memcpy( to->ExtendedRegisters, from->ext.i386_regs, sizeof(to->ExtendedRegisters) );
}
return STATUS_SUCCESS;
}
/***********************************************************************
* NtSetContextThread (NTDLL.@)
* ZwSetContextThread (NTDLL.@)
*/
NTSTATUS WINAPI NtSetContextThread( HANDLE handle, const CONTEXT *context )
{
NTSTATUS ret = STATUS_SUCCESS;
BOOL self = (handle == GetCurrentThread());
/* debug registers require a server call */
if (self && (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386)))
self = (x86_thread_data()->dr0 == context->Dr0 &&
x86_thread_data()->dr1 == context->Dr1 &&
x86_thread_data()->dr2 == context->Dr2 &&
x86_thread_data()->dr3 == context->Dr3 &&
x86_thread_data()->dr6 == context->Dr6 &&
x86_thread_data()->dr7 == context->Dr7);
if (!self)
{
context_t server_context;
context_to_server( &server_context, context );
ret = set_thread_context( handle, &server_context, &self );
}
if (self && ret == STATUS_SUCCESS) set_cpu_context( context );
return ret;
}
/***********************************************************************
* NtGetContextThread (NTDLL.@)
* ZwGetContextThread (NTDLL.@)
*
* Note: we use a small assembly wrapper to save the necessary registers
* in case we are fetching the context of the current thread.
*/
NTSTATUS CDECL DECLSPEC_HIDDEN __regs_NtGetContextThread( DWORD edi, DWORD esi, DWORD ebx, DWORD eflags,
DWORD ebp, DWORD retaddr, HANDLE handle,
CONTEXT *context )
{
NTSTATUS ret;
DWORD needed_flags = context->ContextFlags & ~CONTEXT_i386;
BOOL self = (handle == GetCurrentThread());
/* debug registers require a server call */
if (needed_flags & CONTEXT_DEBUG_REGISTERS) self = FALSE;
if (!self)
{
context_t server_context;
unsigned int server_flags = get_server_context_flags( context->ContextFlags );
if ((ret = get_thread_context( handle, &server_context, server_flags, &self ))) return ret;
if ((ret = context_from_server( context, &server_context ))) return ret;
needed_flags &= ~context->ContextFlags;
}
if (self)
{
if (needed_flags & CONTEXT_INTEGER)
{
context->Eax = 0;
context->Ebx = ebx;
context->Ecx = 0;
context->Edx = 0;
context->Esi = esi;
context->Edi = edi;
context->ContextFlags |= CONTEXT_INTEGER;
}
if (needed_flags & CONTEXT_CONTROL)
{
context->Ebp = ebp;
context->Esp = (DWORD)&retaddr;
context->Eip = *(&edi - 1);
context->SegCs = get_cs();
context->SegSs = get_ds();
context->EFlags = eflags;
context->ContextFlags |= CONTEXT_CONTROL;
}
if (needed_flags & CONTEXT_SEGMENTS)
{
context->SegDs = get_ds();
context->SegEs = get_ds();
context->SegFs = get_fs();
context->SegGs = get_gs();
context->ContextFlags |= CONTEXT_SEGMENTS;
}
if (needed_flags & CONTEXT_FLOATING_POINT) save_fpu( context );
if (needed_flags & CONTEXT_EXTENDED_REGISTERS) save_fpux( context );
/* FIXME: xstate */
/* update the cached version of the debug registers */
if (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386))
{
x86_thread_data()->dr0 = context->Dr0;
x86_thread_data()->dr1 = context->Dr1;
x86_thread_data()->dr2 = context->Dr2;
x86_thread_data()->dr3 = context->Dr3;
x86_thread_data()->dr6 = context->Dr6;
x86_thread_data()->dr7 = context->Dr7;
}
}
if (context->ContextFlags & (CONTEXT_INTEGER & ~CONTEXT_i386))
TRACE( "%p: eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n", handle,
context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi );
if (context->ContextFlags & (CONTEXT_CONTROL & ~CONTEXT_i386))
TRACE( "%p: ebp=%08x esp=%08x eip=%08x cs=%04x ss=%04x flags=%08x\n", handle,
context->Ebp, context->Esp, context->Eip, context->SegCs, context->SegSs, context->EFlags );
if (context->ContextFlags & (CONTEXT_SEGMENTS & ~CONTEXT_i386))
TRACE( "%p: ds=%04x es=%04x fs=%04x gs=%04x\n", handle,
context->SegDs, context->SegEs, context->SegFs, context->SegGs );
if (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386))
TRACE( "%p: dr0=%08x dr1=%08x dr2=%08x dr3=%08x dr6=%08x dr7=%08x\n", handle,
context->Dr0, context->Dr1, context->Dr2, context->Dr3, context->Dr6, context->Dr7 );
return STATUS_SUCCESS;
}
__ASM_STDCALL_FUNC( NtGetContextThread, 8,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"pushfl\n\t"
"pushl %ebx\n\t"
__ASM_CFI(".cfi_rel_offset %ebx,-8\n\t")
"pushl %esi\n\t"
__ASM_CFI(".cfi_rel_offset %esi,-12\n\t")
"pushl %edi\n\t"
__ASM_CFI(".cfi_rel_offset %edi,-16\n\t")
"call " __ASM_NAME("__regs_NtGetContextThread") "\n\t"
"leave\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret $8" )
/***********************************************************************
* is_privileged_instr
*
* Check if the fault location is a privileged instruction.
* Based on the instruction emulation code in dlls/kernel/instr.c.
*/
static inline DWORD is_privileged_instr( CONTEXT *context )
{
BYTE instr[16];
unsigned int i, len, prefix_count = 0;
if (!ldt_is_system( context->SegCs )) return 0;
len = virtual_uninterrupted_read_memory( (BYTE *)context->Eip, instr, sizeof(instr) );
for (i = 0; i < len; i++) switch (instr[i])
{
/* instruction prefixes */
case 0x2e: /* %cs: */
case 0x36: /* %ss: */
case 0x3e: /* %ds: */
case 0x26: /* %es: */
case 0x64: /* %fs: */
case 0x65: /* %gs: */
case 0x66: /* opcode size */
case 0x67: /* addr size */
case 0xf0: /* lock */
case 0xf2: /* repne */
case 0xf3: /* repe */
if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
continue;
case 0x0f: /* extended instruction */
if (i == len - 1) return 0;
switch(instr[i + 1])
{
case 0x20: /* mov crX, reg */
case 0x21: /* mov drX, reg */
case 0x22: /* mov reg, crX */
case 0x23: /* mov reg drX */
return EXCEPTION_PRIV_INSTRUCTION;
}
return 0;
case 0x6c: /* insb (%dx) */
case 0x6d: /* insl (%dx) */
case 0x6e: /* outsb (%dx) */
case 0x6f: /* outsl (%dx) */
case 0xcd: /* int $xx */
case 0xe4: /* inb al,XX */
case 0xe5: /* in (e)ax,XX */
case 0xe6: /* outb XX,al */
case 0xe7: /* out XX,(e)ax */
case 0xec: /* inb (%dx),%al */
case 0xed: /* inl (%dx),%eax */
case 0xee: /* outb %al,(%dx) */
case 0xef: /* outl %eax,(%dx) */
case 0xf4: /* hlt */
case 0xfa: /* cli */
case 0xfb: /* sti */
return EXCEPTION_PRIV_INSTRUCTION;
default:
return 0;
}
return 0;
}
/***********************************************************************
* check_invalid_gs
*
* Check for fault caused by invalid %gs value (some copy protection schemes mess with it).
*/
static inline BOOL check_invalid_gs( ucontext_t *sigcontext, CONTEXT *context )
{
unsigned int prefix_count = 0;
const BYTE *instr = (BYTE *)context->Eip;
WORD system_gs = x86_thread_data()->gs;
if (context->SegGs == system_gs) return FALSE;
if (!ldt_is_system( context->SegCs )) return FALSE;
/* only handle faults in system libraries */
if (virtual_is_valid_code_address( instr, 1 )) return FALSE;
for (;;) switch(*instr)
{
/* instruction prefixes */
case 0x2e: /* %cs: */
case 0x36: /* %ss: */
case 0x3e: /* %ds: */
case 0x26: /* %es: */
case 0x64: /* %fs: */
case 0x66: /* opcode size */
case 0x67: /* addr size */
case 0xf0: /* lock */
case 0xf2: /* repne */
case 0xf3: /* repe */
if (++prefix_count >= 15) return FALSE;
instr++;
continue;
case 0x65: /* %gs: */
TRACE( "%04x/%04x at %p, fixing up\n", context->SegGs, system_gs, instr );
#ifdef GS_sig
GS_sig(sigcontext) = system_gs;
#endif
return TRUE;
default:
return FALSE;
}
}
#include "pshpack1.h"
union atl_thunk
{
struct
{
DWORD movl; /* movl this,4(%esp) */
DWORD this;
BYTE jmp; /* jmp func */
int func;
} t1;
struct
{
BYTE movl; /* movl this,ecx */
DWORD this;
BYTE jmp; /* jmp func */
int func;
} t2;
struct
{
BYTE movl1; /* movl this,edx */
DWORD this;
BYTE movl2; /* movl func,ecx */
DWORD func;
WORD jmp; /* jmp ecx */
} t3;
struct
{
BYTE movl1; /* movl this,ecx */
DWORD this;
BYTE movl2; /* movl func,eax */
DWORD func;
WORD jmp; /* jmp eax */
} t4;
struct
{
DWORD inst1; /* pop ecx
* pop eax
* push ecx
* jmp 4(%eax) */
WORD inst2;
} t5;
};
#include "poppack.h"
/**********************************************************************
* check_atl_thunk
*
* Check if code destination is an ATL thunk, and emulate it if so.
*/
static BOOL check_atl_thunk( ucontext_t *sigcontext, struct stack_layout *stack )
{
const union atl_thunk *thunk = (const union atl_thunk *)stack->rec.ExceptionInformation[1];
union atl_thunk thunk_copy;
SIZE_T thunk_len;
thunk_len = virtual_uninterrupted_read_memory( thunk, &thunk_copy, sizeof(*thunk) );
if (!thunk_len) return FALSE;
if (thunk_len >= sizeof(thunk_copy.t1) && thunk_copy.t1.movl == 0x042444c7 &&
thunk_copy.t1.jmp == 0xe9)
{
if (!virtual_uninterrupted_write_memory( (DWORD *)stack->context.Esp + 1,
&thunk_copy.t1.this, sizeof(DWORD) ))
{
EIP_sig(sigcontext) = (DWORD_PTR)(&thunk->t1.func + 1) + thunk_copy.t1.func;
TRACE( "emulating ATL thunk type 1 at %p, func=%08x arg=%08x\n",
thunk, EIP_sig(sigcontext), thunk_copy.t1.this );
return TRUE;
}
}
else if (thunk_len >= sizeof(thunk_copy.t2) && thunk_copy.t2.movl == 0xb9 &&
thunk_copy.t2.jmp == 0xe9)
{
ECX_sig(sigcontext) = thunk_copy.t2.this;
EIP_sig(sigcontext) = (DWORD_PTR)(&thunk->t2.func + 1) + thunk_copy.t2.func;
TRACE( "emulating ATL thunk type 2 at %p, func=%08x ecx=%08x\n",
thunk, EIP_sig(sigcontext), ECX_sig(sigcontext) );
return TRUE;
}
else if (thunk_len >= sizeof(thunk_copy.t3) && thunk_copy.t3.movl1 == 0xba &&
thunk_copy.t3.movl2 == 0xb9 &&
thunk_copy.t3.jmp == 0xe1ff)
{
EDX_sig(sigcontext) = thunk_copy.t3.this;
ECX_sig(sigcontext) = thunk_copy.t3.func;
EIP_sig(sigcontext) = thunk_copy.t3.func;
TRACE( "emulating ATL thunk type 3 at %p, func=%08x ecx=%08x edx=%08x\n",
thunk, EIP_sig(sigcontext), ECX_sig(sigcontext), EDX_sig(sigcontext) );
return TRUE;
}
else if (thunk_len >= sizeof(thunk_copy.t4) && thunk_copy.t4.movl1 == 0xb9 &&
thunk_copy.t4.movl2 == 0xb8 &&
thunk_copy.t4.jmp == 0xe0ff)
{
ECX_sig(sigcontext) = thunk_copy.t4.this;
EAX_sig(sigcontext) = thunk_copy.t4.func;
EIP_sig(sigcontext) = thunk_copy.t4.func;
TRACE( "emulating ATL thunk type 4 at %p, func=%08x eax=%08x ecx=%08x\n",
thunk, EIP_sig(sigcontext), EAX_sig(sigcontext), ECX_sig(sigcontext) );
return TRUE;
}
else if (thunk_len >= sizeof(thunk_copy.t5) && thunk_copy.t5.inst1 == 0xff515859 &&
thunk_copy.t5.inst2 == 0x0460)
{
DWORD func, sp[2];
if (virtual_uninterrupted_read_memory( (DWORD *)stack->context.Esp, sp, sizeof(sp) ) == sizeof(sp) &&
virtual_uninterrupted_read_memory( (DWORD *)sp[1] + 1, &func, sizeof(DWORD) ) == sizeof(DWORD) &&
!virtual_uninterrupted_write_memory( (DWORD *)stack->context.Esp + 1, &sp[0], sizeof(sp[0]) ))
{
ECX_sig(sigcontext) = sp[0];
EAX_sig(sigcontext) = sp[1];
ESP_sig(sigcontext) += sizeof(DWORD);
EIP_sig(sigcontext) = func;
TRACE( "emulating ATL thunk type 5 at %p, func=%08x eax=%08x ecx=%08x esp=%08x\n",
thunk, EIP_sig(sigcontext), EAX_sig(sigcontext),
ECX_sig(sigcontext), ESP_sig(sigcontext) );
return TRUE;
}
}
return FALSE;
}
/***********************************************************************
* setup_exception_record
*
* Setup the exception record and context on the thread stack.
*/
static struct stack_layout *setup_exception_record( ucontext_t *sigcontext, void *stack_ptr,
WORD fs, WORD gs )
{
struct stack_layout *stack = stack_ptr;
DWORD exception_code = 0;
/* stack sanity checks */
if ((char *)stack >= (char *)get_signal_stack() &&
(char *)stack < (char *)get_signal_stack() + signal_stack_size)
{
WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
(unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
NtCurrentTeb()->Tib.StackBase );
abort_thread(1);
}
if (stack - 1 > stack || /* check for overflow in subtraction */
(char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
(char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
{
WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
(unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
NtCurrentTeb()->Tib.StackBase );
}
else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
{
/* stack overflow on last page, unrecoverable */
UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
(unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
abort_thread(1);
}
else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
{
/* stack access below stack limit, may be recoverable */
switch (virtual_handle_stack_fault( stack - 1 ))
{
case 0: /* not handled */
{
UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
(unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
abort_thread(1);
}
case -1: /* overflow */
exception_code = EXCEPTION_STACK_OVERFLOW;
break;
}
}
stack--; /* push the stack_layout structure */
#if defined(VALGRIND_MAKE_MEM_UNDEFINED)
VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
#elif defined(VALGRIND_MAKE_WRITABLE)
VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
#endif
stack->rec.ExceptionRecord = NULL;
stack->rec.ExceptionCode = exception_code;
stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
stack->rec.NumberParameters = 0;
save_context( &stack->context, sigcontext, fs, gs );
return stack;
}
/***********************************************************************
* setup_exception
*
* Setup a proper stack frame for the raise function, and modify the
* sigcontext so that the return from the signal handler will call
* the raise function.
*/
static struct stack_layout *setup_exception( ucontext_t *sigcontext )
{
WORD fs, gs;
void *stack = init_handler( sigcontext, &fs, &gs );
return setup_exception_record( sigcontext, stack, fs, gs );
}
/**********************************************************************
* raise_generic_exception
*
* Generic raise function for exceptions that don't need special treatment.
*/
static void WINAPI raise_generic_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
NTSTATUS status;
status = raise_exception( rec, context, TRUE );
raise_status( status, rec );
}
/***********************************************************************
* setup_raise_exception
*
* Change context to setup a call to a raise exception function.
*/
static void setup_raise_exception( ucontext_t *sigcontext, struct stack_layout *stack )
{
NTSTATUS status = send_debug_event( &stack->rec, TRUE, &stack->context );
if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
{
restore_context( &stack->context, sigcontext );
return;
}
ESP_sig(sigcontext) = (DWORD)stack;
EIP_sig(sigcontext) = (DWORD)raise_generic_exception;
/* clear single-step, direction, and align check flag */
EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
CS_sig(sigcontext) = get_cs();
DS_sig(sigcontext) = get_ds();
ES_sig(sigcontext) = get_ds();
FS_sig(sigcontext) = get_fs();
GS_sig(sigcontext) = get_gs();
SS_sig(sigcontext) = get_ds();
stack->ret_addr = (void *)0xdeadbabe; /* raise_generic_exception must not return */
stack->rec_ptr = &stack->rec; /* arguments for raise_generic_exception */
stack->context_ptr = &stack->context;
}
/**********************************************************************
* get_fpu_code
*
* Get the FPU exception code from the FPU status.
*/
static inline DWORD get_fpu_code( const CONTEXT *context )
{
DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);
if (status & 0x01) /* IE */
{
if (status & 0x40) /* SF */
return EXCEPTION_FLT_STACK_CHECK;
else
return EXCEPTION_FLT_INVALID_OPERATION;
}
if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
}
/***********************************************************************
* handle_interrupt
*
* Handle an interrupt.
*/
static BOOL handle_interrupt( unsigned int interrupt, ucontext_t *sigcontext, struct stack_layout *stack )
{
switch(interrupt)
{
case 0x2d:
if (!is_wow64)
{
/* On Wow64, the upper DWORD of Rax contains garbage, and the debug
* service is usually not recognized when called from usermode. */
switch (stack->context.Eax)
{
case 1: /* BREAKPOINT_PRINT */
case 3: /* BREAKPOINT_LOAD_SYMBOLS */
case 4: /* BREAKPOINT_UNLOAD_SYMBOLS */
case 5: /* BREAKPOINT_COMMAND_STRING (>= Win2003) */
EIP_sig(sigcontext) += 3;
return TRUE;
}
}
stack->context.Eip += 3;
stack->rec.ExceptionCode = EXCEPTION_BREAKPOINT;
stack->rec.ExceptionAddress = (void *)stack->context.Eip;
stack->rec.NumberParameters = is_wow64 ? 1 : 3;
stack->rec.ExceptionInformation[0] = stack->context.Eax;
stack->rec.ExceptionInformation[1] = stack->context.Ecx;
stack->rec.ExceptionInformation[2] = stack->context.Edx;
setup_raise_exception( sigcontext, stack );
return TRUE;
default:
return FALSE;
}
}
/**********************************************************************
* segv_handler
*
* Handler for SIGSEGV and related errors.
*/
static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
WORD fs, gs;
struct stack_layout *stack;
ucontext_t *context = sigcontext;
void *stack_ptr = init_handler( sigcontext, &fs, &gs );
/* check for exceptions on the signal stack caused by write watches */
if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
(char *)stack_ptr >= (char *)get_signal_stack() &&
(char *)stack_ptr < (char *)get_signal_stack() + signal_stack_size &&
!virtual_handle_fault( siginfo->si_addr, (get_error_code(context) >> 1) & 0x09, TRUE ))
{
return;
}
/* check for page fault inside the thread stack */
if (get_trap_code(context) == TRAP_x86_PAGEFLT)
{
switch (virtual_handle_stack_fault( siginfo->si_addr ))
{
case 1: /* handled */
return;
case -1: /* overflow */
stack = setup_exception_record( context, stack_ptr, fs, gs );
stack->rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
goto done;
}
}
stack = setup_exception_record( context, stack_ptr, fs, gs );
if (stack->rec.ExceptionCode == EXCEPTION_STACK_OVERFLOW) goto done;
switch(get_trap_code(context))
{
case TRAP_x86_OFLOW: /* Overflow exception */
stack->rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
break;
case TRAP_x86_BOUND: /* Bound range exception */
stack->rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
break;
case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
stack->rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
case TRAP_x86_STKFLT: /* Stack fault */
stack->rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
break;
case TRAP_x86_SEGNPFLT: /* Segment not present exception */
case TRAP_x86_PROTFLT: /* General protection fault */
case TRAP_x86_UNKNOWN: /* Unknown fault code */
{
WORD err = get_error_code(context);
if (!err && (stack->rec.ExceptionCode = is_privileged_instr( &stack->context ))) break;
if ((err & 7) == 2 && handle_interrupt( err >> 3, context, stack )) return;
stack->rec.ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
stack->rec.NumberParameters = 2;
stack->rec.ExceptionInformation[0] = 0;
/* if error contains a LDT selector, use that as fault address */
if ((err & 7) == 4 && !ldt_is_system( err | 7 ))
stack->rec.ExceptionInformation[1] = err & ~7;
else
{
stack->rec.ExceptionInformation[1] = 0xffffffff;
if (check_invalid_gs( context, &stack->context )) return;
}
}
break;
case TRAP_x86_PAGEFLT: /* Page fault */
stack->rec.NumberParameters = 2;
stack->rec.ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
stack->rec.ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
stack->rec.ExceptionCode = virtual_handle_fault( (void *)stack->rec.ExceptionInformation[1],
stack->rec.ExceptionInformation[0], FALSE );
if (!stack->rec.ExceptionCode) return;
if (stack->rec.ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
stack->rec.ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT)
{
ULONG flags;
NtQueryInformationProcess( GetCurrentProcess(), ProcessExecuteFlags,
&flags, sizeof(flags), NULL );
if (!(flags & MEM_EXECUTE_OPTION_DISABLE_THUNK_EMULATION) && check_atl_thunk( context, stack ))
return;
/* send EXCEPTION_EXECUTE_FAULT only if data execution prevention is enabled */
if (!(flags & MEM_EXECUTE_OPTION_DISABLE))
stack->rec.ExceptionInformation[0] = EXCEPTION_READ_FAULT;
}
break;
case TRAP_x86_ALIGNFLT: /* Alignment check exception */
/* FIXME: pass through exception handler first? */
if (stack->context.EFlags & 0x00040000)
{
EFL_sig(context) &= ~0x00040000; /* disable AC flag */
return;
}
stack->rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
break;
default:
WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
/* fall through */
case TRAP_x86_NMI: /* NMI interrupt */
case TRAP_x86_DNA: /* Device not available exception */
case TRAP_x86_DOUBLEFLT: /* Double fault exception */
case TRAP_x86_TSSFLT: /* Invalid TSS exception */
case TRAP_x86_MCHK: /* Machine check exception */
case TRAP_x86_CACHEFLT: /* Cache flush exception */
stack->rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
}
done:
setup_raise_exception( context, stack );
}
/**********************************************************************
* trap_handler
*
* Handler for SIGTRAP.
*/
static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
ucontext_t *context = sigcontext;
struct stack_layout *stack = setup_exception( context );
switch(get_trap_code(context))
{
case TRAP_x86_TRCTRAP: /* Single-step exception */
stack->rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
/* when single stepping can't tell whether this is a hw bp or a
* single step interrupt. try to avoid as much overhead as possible
* and only do a server call if there is any hw bp enabled. */
if (!(stack->context.EFlags & 0x100) || (stack->context.Dr7 & 0xff))
{
/* (possible) hardware breakpoint, fetch the debug registers */
DWORD saved_flags = stack->context.ContextFlags;
stack->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
NtGetContextThread( GetCurrentThread(), &stack->context );
stack->context.ContextFlags |= saved_flags; /* restore flags */
}
stack->context.EFlags &= ~0x100; /* clear single-step flag */
break;
case TRAP_x86_BPTFLT: /* Breakpoint exception */
stack->rec.ExceptionAddress = (char *)stack->rec.ExceptionAddress - 1; /* back up over the int3 instruction */
/* fall through */
default:
stack->rec.ExceptionCode = EXCEPTION_BREAKPOINT;
stack->rec.NumberParameters = is_wow64 ? 1 : 3;
stack->rec.ExceptionInformation[0] = 0;
stack->rec.ExceptionInformation[1] = 0; /* FIXME */
stack->rec.ExceptionInformation[2] = 0; /* FIXME */
break;
}
setup_raise_exception( context, stack );
}
/**********************************************************************
* fpe_handler
*
* Handler for SIGFPE.
*/
static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
ucontext_t *context = sigcontext;
struct stack_layout *stack = setup_exception( context );
switch(get_trap_code(context))
{
case TRAP_x86_DIVIDE: /* Division by zero exception */
stack->rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
break;
case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
stack->rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
case TRAP_x86_ARITHTRAP: /* Floating point exception */
case TRAP_x86_UNKNOWN: /* Unknown fault code */
stack->rec.ExceptionCode = get_fpu_code( &stack->context );
stack->rec.ExceptionAddress = (LPVOID)stack->context.FloatSave.ErrorOffset;
break;
case TRAP_x86_CACHEFLT: /* SIMD exception */
/* TODO:
* Behaviour only tested for divide-by-zero exceptions
* Check for other SIMD exceptions as well */
if(siginfo->si_code != FPE_FLTDIV && siginfo->si_code != FPE_FLTINV)
FIXME("untested SIMD exception: %#x. Might not work correctly\n",
siginfo->si_code);
stack->rec.ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
stack->rec.NumberParameters = 1;
/* no idea what meaning is actually behind this but that's what native does */
stack->rec.ExceptionInformation[0] = 0;
break;
default:
WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
stack->rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
}
setup_raise_exception( context, stack );
}
/**********************************************************************
* int_handler
*
* Handler for SIGINT.
*
* FIXME: should not be calling external functions on the signal stack.
*/
static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
WORD fs, gs;
void *stack_ptr = init_handler( sigcontext, &fs, &gs );
if (!dispatch_signal(SIGINT))
{
struct stack_layout *stack = setup_exception_record( sigcontext, stack_ptr, fs, gs );
stack->rec.ExceptionCode = CONTROL_C_EXIT;
setup_raise_exception( sigcontext, stack );
}
}
/**********************************************************************
* abrt_handler
*
* Handler for SIGABRT.
*/
static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
struct stack_layout *stack = setup_exception( sigcontext );
stack->rec.ExceptionCode = EXCEPTION_WINE_ASSERTION;
stack->rec.ExceptionFlags = EH_NONCONTINUABLE;
setup_raise_exception( sigcontext, stack );
}
/**********************************************************************
* quit_handler
*
* Handler for SIGQUIT.
*/
static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
WORD fs, gs;
init_handler( sigcontext, &fs, &gs );
abort_thread(0);
}
/**********************************************************************
* usr1_handler
*
* Handler for SIGUSR1, used to signal a thread that it got suspended.
*/
static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
CONTEXT context;
WORD fs, gs;
init_handler( sigcontext, &fs, &gs );
save_context( &context, sigcontext, fs, gs );
wait_suspend( &context );
restore_context( &context, sigcontext );
}
/***********************************************************************
* __wine_set_signal_handler (NTDLL.@)
*/
int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
{
if (sig >= ARRAY_SIZE(handlers)) return -1;
if (handlers[sig] != NULL) return -2;
handlers[sig] = wsh;
return 0;
}
/***********************************************************************
* LDT support
*/
#define LDT_SIZE 8192
#define LDT_FLAGS_DATA 0x13 /* Data segment */
#define LDT_FLAGS_CODE 0x1b /* Code segment */
#define LDT_FLAGS_32BIT 0x40 /* Segment is 32-bit (code or stack) */
#define LDT_FLAGS_ALLOCATED 0x80 /* Segment is allocated */
struct ldt_copy
{
void *base[LDT_SIZE];
unsigned int limit[LDT_SIZE];
unsigned char flags[LDT_SIZE];
} __wine_ldt_copy;
static WORD gdt_fs_sel;
static RTL_CRITICAL_SECTION ldt_section;
static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
{
0, 0, &ldt_section,
{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": ldt_section") }
};
static RTL_CRITICAL_SECTION ldt_section = { &critsect_debug, -1, 0, 0, 0, 0 };
static sigset_t ldt_sigset;
static const LDT_ENTRY null_entry;
static void ldt_lock(void)
{
sigset_t sigset;
pthread_sigmask( SIG_BLOCK, &server_block_set, &sigset );
RtlEnterCriticalSection( &ldt_section );
if (ldt_section.RecursionCount == 1) ldt_sigset = sigset;
}
static void ldt_unlock(void)
{
if (ldt_section.RecursionCount == 1)
{
sigset_t sigset = ldt_sigset;
RtlLeaveCriticalSection( &ldt_section );
pthread_sigmask( SIG_SETMASK, &sigset, NULL );
}
else RtlLeaveCriticalSection( &ldt_section );
}
static inline void *ldt_get_base( LDT_ENTRY ent )
{
return (void *)(ent.BaseLow |
(ULONG_PTR)ent.HighWord.Bits.BaseMid << 16 |
(ULONG_PTR)ent.HighWord.Bits.BaseHi << 24);
}
static inline unsigned int ldt_get_limit( LDT_ENTRY ent )
{
unsigned int limit = ent.LimitLow | (ent.HighWord.Bits.LimitHi << 16);
if (ent.HighWord.Bits.Granularity) limit = (limit << 12) | 0xfff;
return limit;
}
static LDT_ENTRY ldt_make_entry( void *base, unsigned int limit, unsigned char flags )
{
LDT_ENTRY entry;
entry.BaseLow = (WORD)(ULONG_PTR)base;
entry.HighWord.Bits.BaseMid = (BYTE)((ULONG_PTR)base >> 16);
entry.HighWord.Bits.BaseHi = (BYTE)((ULONG_PTR)base >> 24);
if ((entry.HighWord.Bits.Granularity = (limit >= 0x100000))) limit >>= 12;
entry.LimitLow = (WORD)limit;
entry.HighWord.Bits.LimitHi = limit >> 16;
entry.HighWord.Bits.Dpl = 3;
entry.HighWord.Bits.Pres = 1;
entry.HighWord.Bits.Type = flags;
entry.HighWord.Bits.Sys = 0;
entry.HighWord.Bits.Reserved_0 = 0;
entry.HighWord.Bits.Default_Big = (flags & LDT_FLAGS_32BIT) != 0;
return entry;
}
static void ldt_set_entry( WORD sel, LDT_ENTRY entry )
{
int index = sel >> 3;
#ifdef linux
struct modify_ldt_s ldt_info = { index };
ldt_info.base_addr = ldt_get_base( entry );
ldt_info.limit = entry.LimitLow | (entry.HighWord.Bits.LimitHi << 16);
ldt_info.seg_32bit = entry.HighWord.Bits.Default_Big;
ldt_info.contents = (entry.HighWord.Bits.Type >> 2) & 3;
ldt_info.read_exec_only = !(entry.HighWord.Bits.Type & 2);
ldt_info.limit_in_pages = entry.HighWord.Bits.Granularity;
ldt_info.seg_not_present = !entry.HighWord.Bits.Pres;
ldt_info.usable = entry.HighWord.Bits.Sys;
if (modify_ldt( 0x11, &ldt_info, sizeof(ldt_info) ) < 0) perror( "modify_ldt" );
#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
/* The kernel will only let us set LDTs with user priority level */
if (entry.HighWord.Bits.Pres && entry.HighWord.Bits.Dpl != 3) entry.HighWord.Bits.Dpl = 3;
if (i386_set_ldt(index, (union descriptor *)&entry, 1) < 0)
{
perror("i386_set_ldt");
fprintf( stderr, "Did you reconfigure the kernel with \"options USER_LDT\"?\n" );
exit(1);
}
#elif defined(__svr4__) || defined(_SCO_DS)
struct ssd ldt_mod;
ldt_mod.sel = sel;
ldt_mod.bo = (unsigned long)ldt_get_base( entry );
ldt_mod.ls = entry.LimitLow | (entry.HighWord.Bits.LimitHi << 16);
ldt_mod.acc1 = entry.HighWord.Bytes.Flags1;
ldt_mod.acc2 = entry.HighWord.Bytes.Flags2 >> 4;
if (sysi86(SI86DSCR, &ldt_mod) == -1) perror("sysi86");
#elif defined(__APPLE__)
if (i386_set_ldt(index, (union ldt_entry *)&entry, 1) < 0) perror("i386_set_ldt");
#elif defined(__GNU__)
if (i386_set_ldt(mach_thread_self(), sel, (descriptor_list_t)&entry, 1) != KERN_SUCCESS)
perror("i386_set_ldt");
#else
fprintf( stderr, "No LDT support on this platform\n" );
exit(1);
#endif
__wine_ldt_copy.base[index] = ldt_get_base( entry );
__wine_ldt_copy.limit[index] = ldt_get_limit( entry );
__wine_ldt_copy.flags[index] = (entry.HighWord.Bits.Type |
(entry.HighWord.Bits.Default_Big ? LDT_FLAGS_32BIT : 0) |
LDT_FLAGS_ALLOCATED);
}
static void ldt_init(void)
{
#ifdef __linux__
/* the preloader may have allocated it already */
gdt_fs_sel = get_fs();
if (!gdt_fs_sel || !is_gdt_sel( gdt_fs_sel ))
{
struct modify_ldt_s ldt_info = { -1 };
ldt_info.seg_32bit = 1;
ldt_info.usable = 1;
if (set_thread_area( &ldt_info ) >= 0) gdt_fs_sel = (ldt_info.entry_number << 3) | 3;
else gdt_fs_sel = 0;
}
#elif defined(__FreeBSD__) || defined (__FreeBSD_kernel__)
gdt_fs_sel = GSEL( GUFS_SEL, SEL_UPL );
#endif
}
WORD ldt_alloc_fs( TEB *teb, int first_thread )
{
LDT_ENTRY entry;
int idx;
if (gdt_fs_sel) return gdt_fs_sel;
entry = ldt_make_entry( teb, teb_size - 1, LDT_FLAGS_DATA | LDT_FLAGS_32BIT );
if (first_thread) /* no locking for first thread */
{
/* leave some space if libc is using the LDT for %gs */
if (!is_gdt_sel( get_gs() )) first_ldt_entry = 512;
idx = first_ldt_entry;
ldt_set_entry( (idx << 3) | 7, entry );
}
else
{
ldt_lock();
for (idx = first_ldt_entry; idx < LDT_SIZE; idx++)
{
if (__wine_ldt_copy.flags[idx]) continue;
ldt_set_entry( (idx << 3) | 7, entry );
break;
}
ldt_unlock();
if (idx == LDT_SIZE) return 0;
}
return (idx << 3) | 7;
}
static void ldt_free_fs( WORD sel )
{
if (sel == gdt_fs_sel) return;
ldt_lock();
__wine_ldt_copy.flags[sel >> 3] = 0;
ldt_unlock();
}
static void ldt_set_fs( WORD sel, TEB *teb )
{
if (sel == gdt_fs_sel)
{
#ifdef __linux__
struct modify_ldt_s ldt_info = { sel >> 3 };
ldt_info.base_addr = teb;
ldt_info.limit = teb_size - 1;
ldt_info.seg_32bit = 1;
if (set_thread_area( &ldt_info ) < 0) perror( "set_thread_area" );
#elif defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__DragonFly__)
i386_set_fsbase( teb );
#endif
}
set_fs( sel );
}
/**********************************************************************
* get_thread_ldt_entry
*/
NTSTATUS get_thread_ldt_entry( HANDLE handle, void *data, ULONG len, ULONG *ret_len )
{
THREAD_DESCRIPTOR_INFORMATION *info = data;
NTSTATUS status = STATUS_SUCCESS;
if (len < sizeof(*info)) return STATUS_INFO_LENGTH_MISMATCH;
if (info->Selector >> 16) return STATUS_UNSUCCESSFUL;
if (is_gdt_sel( info->Selector ))
{
if (!(info->Selector & ~3))
info->Entry = null_entry;
else if ((info->Selector | 3) == get_cs())
info->Entry = ldt_make_entry( 0, ~0u, LDT_FLAGS_CODE | LDT_FLAGS_32BIT );
else if ((info->Selector | 3) == get_ds())
info->Entry = ldt_make_entry( 0, ~0u, LDT_FLAGS_DATA | LDT_FLAGS_32BIT );
else if ((info->Selector | 3) == get_fs())
info->Entry = ldt_make_entry( NtCurrentTeb(), 0xfff, LDT_FLAGS_DATA | LDT_FLAGS_32BIT );
else
return STATUS_UNSUCCESSFUL;
}
else
{
SERVER_START_REQ( get_selector_entry )
{
req->handle = wine_server_obj_handle( handle );
req->entry = info->Selector >> 3;
status = wine_server_call( req );
if (!status)
{
if (reply->flags)
info->Entry = ldt_make_entry( (void *)reply->base, reply->limit, reply->flags );
else
status = STATUS_UNSUCCESSFUL;
}
}
SERVER_END_REQ;
}
if (status == STATUS_SUCCESS && ret_len)
/* yes, that's a bit strange, but it's the way it is */
*ret_len = sizeof(info->Entry);
return status;
}
/******************************************************************************
* NtSetLdtEntries (NTDLL.@)
* ZwSetLdtEntries (NTDLL.@)
*/
NTSTATUS WINAPI NtSetLdtEntries( ULONG sel1, LDT_ENTRY entry1, ULONG sel2, LDT_ENTRY entry2 )
{
if (sel1 >> 16 || sel2 >> 16) return STATUS_INVALID_LDT_DESCRIPTOR;
if (sel1 && (sel1 >> 3) < first_ldt_entry) return STATUS_INVALID_LDT_DESCRIPTOR;
if (sel2 && (sel2 >> 3) < first_ldt_entry) return STATUS_INVALID_LDT_DESCRIPTOR;
ldt_lock();
if (sel1) ldt_set_entry( sel1, entry1 );
if (sel2) ldt_set_entry( sel2, entry2 );
ldt_unlock();
return STATUS_SUCCESS;
}
/**********************************************************************
* signal_alloc_thread
*/
NTSTATUS signal_alloc_thread( TEB **teb )
{
static size_t sigstack_alignment;
struct x86_thread_data *thread_data;
SIZE_T size;
void *addr = NULL;
NTSTATUS status;
int first_thread = !sigstack_alignment;
if (!sigstack_alignment)
{
size_t min_size = teb_size + max( MINSIGSTKSZ, 8192 );
/* find the first power of two not smaller than min_size */
sigstack_alignment = 12;
while ((1u << sigstack_alignment) < min_size) sigstack_alignment++;
signal_stack_mask = (1 << sigstack_alignment) - 1;
signal_stack_size = (1 << sigstack_alignment) - teb_size;
ldt_init();
}
size = signal_stack_mask + 1;
if (!(status = virtual_alloc_aligned( &addr, 0, &size, MEM_COMMIT | MEM_TOP_DOWN,
PAGE_READWRITE, sigstack_alignment )))
{
*teb = addr;
(*teb)->Tib.Self = &(*teb)->Tib;
(*teb)->Tib.ExceptionList = (void *)~0UL;
thread_data = (struct x86_thread_data *)(*teb)->SystemReserved2;
if (!(thread_data->fs = ldt_alloc_fs( *teb, first_thread )))
{
size = 0;
NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
status = STATUS_TOO_MANY_THREADS;
}
}
return status;
}
/**********************************************************************
* signal_free_thread
*/
void signal_free_thread( TEB *teb )
{
SIZE_T size = 0;
struct x86_thread_data *thread_data = (struct x86_thread_data *)teb->SystemReserved2;
ldt_free_fs( thread_data->fs );
NtFreeVirtualMemory( NtCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
}
/**********************************************************************
* signal_init_thread
*/
void signal_init_thread( TEB *teb )
{
const WORD fpu_cw = 0x27f;
struct x86_thread_data *thread_data = (struct x86_thread_data *)teb->SystemReserved2;
stack_t ss;
#ifdef __APPLE__
int mib[2], val = 1;
mib[0] = CTL_KERN;
mib[1] = KERN_THALTSTACK;
sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
#endif
ss.ss_sp = (char *)teb + teb_size;
ss.ss_size = signal_stack_size;
ss.ss_flags = 0;
if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
ldt_set_fs( thread_data->fs, teb );
thread_data->gs = get_gs();
#ifdef __GNUC__
__asm__ volatile ("fninit; fldcw %0" : : "m" (fpu_cw));
#else
FIXME("FPU setup not implemented for this platform.\n");
#endif
}
/**********************************************************************
* signal_init_process
*/
void signal_init_process(void)
{
struct sigaction sig_act;
sig_act.sa_mask = server_block_set;
sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
#ifdef SA_ONSTACK
sig_act.sa_flags |= SA_ONSTACK;
#endif
#ifdef __ANDROID__
sig_act.sa_flags |= SA_RESTORER;
sig_act.sa_restorer = rt_sigreturn;
#endif
sig_act.sa_sigaction = int_handler;
if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = fpe_handler;
if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = abrt_handler;
if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = quit_handler;
if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = usr1_handler;
if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
sig_act.sa_sigaction = segv_handler;
if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
#ifdef SIGBUS
if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
#endif
#ifdef SIGTRAP
sig_act.sa_sigaction = trap_handler;
if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
#endif
return;
error:
perror("sigaction");
exit(1);
}
/*******************************************************************
* RtlUnwind (NTDLL.@)
*/
void WINAPI DECLSPEC_HIDDEN __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID targetIp,
PEXCEPTION_RECORD pRecord, PVOID retval, CONTEXT *context )
{
EXCEPTION_RECORD record;
EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
DWORD res;
context->Eax = (DWORD)retval;
/* build an exception record, if we do not have one */
if (!pRecord)
{
record.ExceptionCode = STATUS_UNWIND;
record.ExceptionFlags = 0;
record.ExceptionRecord = NULL;
record.ExceptionAddress = (void *)context->Eip;
record.NumberParameters = 0;
pRecord = &record;
}
pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
TRACE( "eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi );
TRACE( "ebp=%08x esp=%08x eip=%08x cs=%04x ds=%04x fs=%04x gs=%04x flags=%08x\n",
context->Ebp, context->Esp, context->Eip, LOWORD(context->SegCs), LOWORD(context->SegDs),
LOWORD(context->SegFs), LOWORD(context->SegGs), context->EFlags );
/* get chain of exception frames */
frame = NtCurrentTeb()->Tib.ExceptionList;
while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
{
/* Check frame address */
if (pEndFrame && (frame > pEndFrame))
raise_status( STATUS_INVALID_UNWIND_TARGET, pRecord );
if (!is_valid_frame( frame )) raise_status( STATUS_BAD_STACK, pRecord );
/* Call handler */
TRACE( "calling handler at %p code=%x flags=%x\n",
frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, unwind_handler );
TRACE( "handler at %p returned %x\n", frame->Handler, res );
switch(res)
{
case ExceptionContinueSearch:
break;
case ExceptionCollidedUnwind:
frame = dispatch;
break;
default:
raise_status( STATUS_INVALID_DISPOSITION, pRecord );
break;
}
frame = __wine_pop_frame( frame );
}
NtSetContextThread( GetCurrentThread(), context );
}
__ASM_STDCALL_FUNC( RtlUnwind, 16,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"leal -(0x2cc+8)(%esp),%esp\n\t" /* sizeof(CONTEXT) + alignment */
"pushl %eax\n\t"
"leal 4(%esp),%eax\n\t" /* context */
"xchgl %eax,(%esp)\n\t"
"call " __ASM_STDCALL("RtlCaptureContext",4) "\n\t"
"leal 24(%ebp),%eax\n\t"
"movl %eax,0xc4(%esp)\n\t" /* context->Esp */
"pushl %esp\n\t"
"pushl 20(%ebp)\n\t"
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"call " __ASM_STDCALL("__regs_RtlUnwind",20) "\n\t"
"leave\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret $16" ) /* actually never returns */
/*******************************************************************
* NtRaiseException (NTDLL.@)
*/
NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
{
if (first_chance)
{
NTSTATUS status = send_debug_event( rec, TRUE, context );
if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
NtSetContextThread( GetCurrentThread(), context );
}
return raise_exception( rec, context, first_chance );
}
/*******************************************************************
* raise_exception_full_context
*
* Raise an exception with the full CPU context.
*/
void raise_exception_full_context( EXCEPTION_RECORD *rec, CONTEXT *context )
{
save_fpu( context );
save_fpux( context );
/* FIXME: xstate */
context->Dr0 = x86_thread_data()->dr0;
context->Dr1 = x86_thread_data()->dr1;
context->Dr2 = x86_thread_data()->dr2;
context->Dr3 = x86_thread_data()->dr3;
context->Dr6 = x86_thread_data()->dr6;
context->Dr7 = x86_thread_data()->dr7;
context->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
RtlRaiseStatus( NtRaiseException( rec, context, TRUE ));
}
/***********************************************************************
* RtlRaiseException (NTDLL.@)
*/
__ASM_STDCALL_FUNC( RtlRaiseException, 4,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"leal -0x2cc(%esp),%esp\n\t" /* sizeof(CONTEXT) */
"pushl %esp\n\t" /* context */
"call " __ASM_STDCALL("RtlCaptureContext",4) "\n\t"
"movl 4(%ebp),%eax\n\t" /* return address */
"movl 8(%ebp),%ecx\n\t" /* rec */
"movl %eax,12(%ecx)\n\t" /* rec->ExceptionAddress */
"leal 12(%ebp),%eax\n\t"
"movl %eax,0xc4(%esp)\n\t" /* context->Esp */
"movl %esp,%eax\n\t"
"pushl %eax\n\t"
"pushl %ecx\n\t"
"call " __ASM_NAME("raise_exception_full_context") "\n\t"
"leave\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret $4" ) /* actually never returns */
/*************************************************************************
* RtlCaptureStackBackTrace (NTDLL.@)
*/
USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
{
CONTEXT context;
ULONG i;
ULONG *frame;
RtlCaptureContext( &context );
if (hash) *hash = 0;
frame = (ULONG *)context.Ebp;
while (skip--)
{
if (!is_valid_frame( frame )) return 0;
frame = (ULONG *)*frame;
}
for (i = 0; i < count; i++)
{
if (!is_valid_frame( frame )) break;
buffer[i] = (void *)frame[1];
if (hash) *hash += frame[1];
frame = (ULONG *)*frame;
}
return i;
}
extern void DECLSPEC_NORETURN start_thread( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend,
void *relay );
__ASM_GLOBAL_FUNC( start_thread,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"pushl %ebx\n\t"
__ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
"pushl %esi\n\t"
__ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
"pushl %edi\n\t"
__ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
/* store exit frame */
"movl %ebp,%fs:0x1f4\n\t" /* x86_thread_data()->exit_frame */
/* switch to thread stack */
"movl %fs:4,%eax\n\t" /* NtCurrentTeb()->StackBase */
"leal -0x1000(%eax),%esp\n\t"
/* attach dlls */
"pushl 20(%ebp)\n\t" /* relay */
"pushl 16(%ebp)\n\t" /* suspend */
"pushl 12(%ebp)\n\t" /* arg */
"pushl 8(%ebp)\n\t" /* entry */
"xorl %ebp,%ebp\n\t"
"call " __ASM_NAME("attach_thread") "\n\t"
"movl %eax,%esi\n\t"
"leal -12(%eax),%esp\n\t"
/* clear the stack */
"andl $~0xfff,%eax\n\t" /* round down to page size */
"movl %eax,(%esp)\n\t"
"call " __ASM_NAME("virtual_clear_thread_stack") "\n\t"
/* switch to the initial context */
"movl %esi,(%esp)\n\t"
"call " __ASM_NAME("set_cpu_context") )
extern void DECLSPEC_NORETURN call_thread_exit_func( int status, void (*func)(int) );
__ASM_GLOBAL_FUNC( call_thread_exit_func,
"movl 8(%esp),%ecx\n\t"
/* fetch exit frame */
"movl %fs:0x1f4,%edx\n\t" /* x86_thread_data()->exit_frame */
"testl %edx,%edx\n\t"
"jnz 1f\n\t"
"jmp *%ecx\n\t"
/* switch to exit frame stack */
"1:\tmovl 4(%esp),%eax\n\t"
"movl $0,%fs:0x1f4\n\t"
"movl %edx,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa %ebp,4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
__ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
__ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
__ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
"leal -20(%ebp),%esp\n\t"
"pushl %eax\n\t"
"call *%ecx" )
extern void call_thread_entry(void) DECLSPEC_HIDDEN;
__ASM_GLOBAL_FUNC( call_thread_entry,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"pushl %ebx\n\t" /* arg */
"pushl %eax\n\t" /* entry */
"call " __ASM_NAME("call_thread_func") )
/* wrapper for apps that don't declare the thread function correctly */
extern DWORD call_thread_func_wrapper( LPTHREAD_START_ROUTINE entry, void *arg );
__ASM_GLOBAL_FUNC(call_thread_func_wrapper,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"subl $4,%esp\n\t"
"pushl 12(%ebp)\n\t"
"call *8(%ebp)\n\t"
"leave\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret" )
/***********************************************************************
* call_thread_func
*/
void DECLSPEC_HIDDEN call_thread_func( LPTHREAD_START_ROUTINE entry, void *arg )
{
__TRY
{
TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", entry, arg );
RtlExitUserThread( call_thread_func_wrapper( entry, arg ));
}
__EXCEPT(call_unhandled_exception_filter)
{
NtTerminateThread( GetCurrentThread(), GetExceptionCode() );
}
__ENDTRY
abort(); /* should not be reached */
}
/***********************************************************************
* init_thread_context
*/
static void init_thread_context( CONTEXT *context, LPTHREAD_START_ROUTINE entry, void *arg, void *relay )
{
context->SegCs = get_cs();
context->SegDs = get_ds();
context->SegEs = get_ds();
context->SegFs = get_fs();
context->SegGs = get_gs();
context->SegSs = get_ds();
context->EFlags = 0x202;
context->Eax = (DWORD)entry;
context->Ebx = (DWORD)arg;
context->Esp = (DWORD)NtCurrentTeb()->Tib.StackBase - 16;
context->Eip = (DWORD)relay;
context->FloatSave.ControlWord = 0x27f;
((XMM_SAVE_AREA32 *)context->ExtendedRegisters)->ControlWord = 0x27f;
((XMM_SAVE_AREA32 *)context->ExtendedRegisters)->MxCsr = 0x1f80;
}
/***********************************************************************
* attach_thread
*/
PCONTEXT DECLSPEC_HIDDEN attach_thread( LPTHREAD_START_ROUTINE entry, void *arg,
BOOL suspend, void *relay )
{
CONTEXT *ctx;
if (suspend)
{
CONTEXT context = { CONTEXT_ALL };
init_thread_context( &context, entry, arg, relay );
wait_suspend( &context );
ctx = (CONTEXT *)((ULONG_PTR)context.Esp & ~15) - 1;
*ctx = context;
}
else
{
ctx = (CONTEXT *)((char *)NtCurrentTeb()->Tib.StackBase - 16) - 1;
init_thread_context( ctx, entry, arg, relay );
}
ctx->ContextFlags = CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
LdrInitializeThunk( ctx, (void **)&ctx->Eax, 0, 0 );
return ctx;
}
/***********************************************************************
* signal_start_thread
*
* Thread startup sequence:
* signal_start_thread()
* -> start_thread()
* -> call_thread_entry()
* -> call_thread_func()
*/
void signal_start_thread( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend )
{
start_thread( entry, arg, suspend, call_thread_entry );
}
/**********************************************************************
* signal_start_process
*
* Process startup sequence:
* signal_start_process()
* -> start_thread()
* -> kernel32_start_process()
*/
void signal_start_process( LPTHREAD_START_ROUTINE entry, BOOL suspend )
{
start_thread( entry, NtCurrentTeb()->Peb, suspend, kernel32_start_process );
}
/***********************************************************************
* signal_exit_thread
*/
void signal_exit_thread( int status )
{
call_thread_exit_func( status, exit_thread );
}
/***********************************************************************
* signal_exit_process
*/
void signal_exit_process( int status )
{
call_thread_exit_func( status, exit );
}
/**********************************************************************
* DbgBreakPoint (NTDLL.@)
*/
__ASM_STDCALL_FUNC( DbgBreakPoint, 0, "int $3; ret")
/**********************************************************************
* DbgUserBreakPoint (NTDLL.@)
*/
__ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "int $3; ret")
/**********************************************************************
* NtCurrentTeb (NTDLL.@)
*/
__ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
/**************************************************************************
* _chkstk (NTDLL.@)
*/
__ASM_STDCALL_FUNC( _chkstk, 0,
"negl %eax\n\t"
"addl %esp,%eax\n\t"
"xchgl %esp,%eax\n\t"
"movl 0(%eax),%eax\n\t" /* copy return address from old location */
"movl %eax,0(%esp)\n\t"
"ret" )
/**************************************************************************
* _alloca_probe (NTDLL.@)
*/
__ASM_STDCALL_FUNC( _alloca_probe, 0,
"negl %eax\n\t"
"addl %esp,%eax\n\t"
"xchgl %esp,%eax\n\t"
"movl 0(%eax),%eax\n\t" /* copy return address from old location */
"movl %eax,0(%esp)\n\t"
"ret" )
/**********************************************************************
* EXC_CallHandler (internal)
*
* Some exception handlers depend on EBP to have a fixed position relative to
* the exception frame.
* Shrinker depends on (*1) doing what it does,
* (*2) being the exact instruction it is and (*3) beginning with 0x64
* (i.e. the %fs prefix to the movl instruction). It also depends on the
* function calling the handler having only 5 parameters (*4).
*/
__ASM_GLOBAL_FUNC( EXC_CallHandler,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"pushl %ebx\n\t"
__ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
"movl 28(%ebp), %edx\n\t" /* ugly hack to pass the 6th param needed because of Shrinker */
"pushl 24(%ebp)\n\t"
"pushl 20(%ebp)\n\t"
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"call " __ASM_NAME("call_exception_handler") "\n\t"
"popl %ebx\n\t"
__ASM_CFI(".cfi_same_value %ebx\n\t")
"leave\n"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret" )
__ASM_GLOBAL_FUNC(call_exception_handler,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"subl $12,%esp\n\t"
"pushl 12(%ebp)\n\t" /* make any exceptions in this... */
"pushl %edx\n\t" /* handler be handled by... */
".byte 0x64\n\t"
"pushl (0)\n\t" /* nested_handler (passed in edx). */
".byte 0x64\n\t"
"movl %esp,(0)\n\t" /* push the new exception frame onto the exception stack. */
"pushl 20(%ebp)\n\t"
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"movl 24(%ebp), %ecx\n\t" /* (*1) */
"call *%ecx\n\t" /* call handler. (*2) */
".byte 0x64\n\t"
"movl (0), %esp\n\t" /* restore previous... (*3) */
".byte 0x64\n\t"
"popl (0)\n\t" /* exception frame. */
"movl %ebp, %esp\n\t" /* restore saved stack, in case it was corrupted */
"popl %ebp\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret $20" ) /* (*4) */
#endif /* __i386__ */
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