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Sweden-Number/dlls/ntdll/unix/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
*/
#if 0
#pragma makedep unix
#endif
#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>
#include <assert.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_UCONTEXT_H
# include <sys/ucontext.h>
#endif
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "ddk/wdm.h"
#include "wine/asm.h"
#include "wine/exception.h"
#include "unix_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
#undef ERR /* Solaris needs to define this */
/***********************************************************************
* 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 */
#ifndef FP_XSTATE_MAGIC1
#define FP_XSTATE_MAGIC1 0x46505853
#endif
#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) ? (XSAVE_FORMAT *)(FPU_sig(context) + 1) : NULL)
#define XState_sig(fpu) (((unsigned int *)fpu->Reserved4)[12] == FP_XSTATE_MAGIC1 ? (XSTATE *)(fpu + 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(__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 */
#define XState_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 XState_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
#define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR])
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
#define FPU_sig(context) NULL /* FIXME */
#define FPUX_sig(context) NULL /* FIXME */
#define XState_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) ((XSAVE_FORMAT *)&(context)->uc_mcontext->__fs.__fpu_fcw)
#define XState_sig(context) NULL /* FIXME */
#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) ((XSAVE_FORMAT *)&(context)->uc_mcontext->fs.fpu_fcw)
#define XState_sig(context) NULL /* FIXME */
#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) ((XSAVE_FORMAT *)&((context)->uc_mcontext.__fpregs))
#define XState_sig(context) NULL /* FIXME */
#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
#define XState_sig(context) NULL /* FIXME */
#else
#error You must define the signal context functions for your platform
#endif /* linux */
static ULONG first_ldt_entry = 32;
enum i386_trap_code
{
#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 syscall_frame
{
DWORD restore_flags; /* 000 */
DWORD eflags; /* 004 */
DWORD eip; /* 008 */
DWORD esp; /* 00c */
WORD cs; /* 010 */
WORD ss; /* 012 */
WORD ds; /* 014 */
WORD es; /* 016 */
WORD fs; /* 018 */
WORD gs; /* 01a */
DWORD eax; /* 01c */
DWORD ebx; /* 020 */
DWORD ecx; /* 024 */
DWORD edx; /* 028 */
DWORD edi; /* 02c */
DWORD esi; /* 030 */
DWORD ebp; /* 034 */
DWORD syscall_flags; /* 038 */
struct syscall_frame *prev_frame; /* 03c */
union /* 040 */
{
XSAVE_FORMAT xsave;
FLOATING_SAVE_AREA fsave;
} u;
/* Leave space for the whole set of YMM registers. They're not used in
* 32-bit mode, but some processors fault if they're not in writable memory.
*/
DECLSPEC_ALIGN(64) XSTATE xstate; /* 240 */
};
C_ASSERT( sizeof(struct syscall_frame) == 0x380 );
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 */
struct syscall_frame *syscall_frame; /* 1f8 frame pointer on syscall entry */
};
C_ASSERT( sizeof(struct x86_thread_data) <= sizeof(((struct ntdll_thread_data *)0)->cpu_data) );
C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, gs ) == 0x1d8 );
C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, exit_frame ) == 0x1f4 );
C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, syscall_frame ) == 0x1f8 );
/* flags to control the behavior of the syscall dispatcher */
#define SYSCALL_HAVE_XSAVE 1
#define SYSCALL_HAVE_XSAVEC 2
#define SYSCALL_HAVE_FXSAVE 4
static inline struct x86_thread_data *x86_thread_data(void)
{
return (struct x86_thread_data *)ntdll_get_thread_data()->cpu_data;
}
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)); }
/***********************************************************************
* unwind_builtin_dll
*/
NTSTATUS CDECL unwind_builtin_dll( ULONG type, struct _DISPATCHER_CONTEXT *dispatch, CONTEXT *context )
{
return STATUS_UNSUCCESSFUL;
}
/***********************************************************************
* 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);
}
/***********************************************************************
* 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) + teb_offset);
}
/***********************************************************************
* is_inside_syscall
*/
static BOOL is_inside_syscall( ucontext_t *sigcontext )
{
return ((char *)ESP_sig(sigcontext) >= (char *)ntdll_get_thread_data()->kernel_stack &&
(char *)ESP_sig(sigcontext) <= (char *)x86_thread_data()->syscall_frame);
}
struct xcontext
{
CONTEXT c;
CONTEXT_EX c_ex;
ULONG64 host_compaction_mask;
};
extern BOOL xstate_compaction_enabled DECLSPEC_HIDDEN;
static inline XSTATE *xstate_from_context( const CONTEXT *context )
{
CONTEXT_EX *xctx = (CONTEXT_EX *)(context + 1);
if ((context->ContextFlags & CONTEXT_XSTATE) != CONTEXT_XSTATE) return NULL;
return (XSTATE *)((char *)xctx + xctx->XState.Offset);
}
static inline void context_init_xstate( CONTEXT *context, void *xstate_buffer )
{
CONTEXT_EX *xctx;
xctx = (CONTEXT_EX *)(context + 1);
xctx->Legacy.Length = sizeof(CONTEXT);
xctx->Legacy.Offset = -(LONG)sizeof(CONTEXT);
xctx->XState.Length = sizeof(XSTATE);
xctx->XState.Offset = (BYTE *)xstate_buffer - (BYTE *)xctx;
xctx->All.Length = sizeof(CONTEXT) + xctx->XState.Offset + xctx->XState.Length;
xctx->All.Offset = -(LONG)sizeof(CONTEXT);
context->ContextFlags |= CONTEXT_XSTATE;
}
#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()->GdiTebBatch;
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) DECLSPEC_HIDDEN;
__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 )
{
TEB *teb = get_current_teb();
clear_alignment_flag();
#ifndef __sun /* see above for Solaris handling */
{
struct x86_thread_data *thread_data = (struct x86_thread_data *)&teb->GdiTebBatch;
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->SystemReserved1[0];
}
return (void *)(ESP_sig(sigcontext) & ~3);
}
/***********************************************************************
* save_fpu
*
* Save the thread FPU context.
*/
static inline void save_fpu( CONTEXT *context )
{
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) );
}
/***********************************************************************
* restore_fpu
*
* Restore the x87 FPU context
*/
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;
__asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
}
/***********************************************************************
* save_context
*
* Build a context structure from the signal info.
*/
static inline void save_context( struct xcontext *xcontext, const ucontext_t *sigcontext )
{
FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
XSAVE_FORMAT *fpux = FPUX_sig(sigcontext);
CONTEXT *context = &xcontext->c;
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 = LOWORD(FS_sig(sigcontext));
context->SegGs = LOWORD(GS_sig(sigcontext));
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)
{
XSTATE *xs;
context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
if ((cpu_info.ProcessorFeatureBits & CPU_FEATURE_AVX) && (xs = XState_sig(fpux)))
{
context_init_xstate( context, xs );
xcontext->host_compaction_mask = xs->CompactionMask;
}
}
if (!fpu && !fpux) save_fpu( context );
}
/***********************************************************************
* restore_context
*
* Restore the signal info from the context.
*/
static inline void restore_context( const struct xcontext *xcontext, ucontext_t *sigcontext )
{
FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
XSAVE_FORMAT *fpux = FPUX_sig(sigcontext);
const CONTEXT *context = &xcontext->c;
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;
FS_sig(sigcontext) = context->SegFs;
GS_sig(sigcontext) = context->SegGs;
SS_sig(sigcontext) = context->SegSs;
if (fpu) *fpu = context->FloatSave;
if (fpux)
{
XSTATE *src_xs, *dst_xs;
memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
if ((dst_xs = XState_sig(fpux)) && (src_xs = xstate_from_context( context )))
{
memcpy( &dst_xs->YmmContext, &src_xs->YmmContext, sizeof(dst_xs->YmmContext) );
dst_xs->Mask |= src_xs->Mask;
dst_xs->CompactionMask = xcontext->host_compaction_mask;
}
}
if (!fpu && !fpux) restore_fpu( context );
}
/***********************************************************************
* signal_set_full_context
*/
NTSTATUS signal_set_full_context( CONTEXT *context )
{
NTSTATUS status = NtSetContextThread( GetCurrentThread(), context );
if (!status && (context->ContextFlags & CONTEXT_INTEGER) == CONTEXT_INTEGER)
x86_thread_data()->syscall_frame->restore_flags |= CONTEXT_INTEGER;
return status;
}
/***********************************************************************
* get_native_context
*/
void *get_native_context( CONTEXT *context )
{
return is_wow64 ? NULL : context;
}
/***********************************************************************
* get_wow_context
*/
void *get_wow_context( CONTEXT *context )
{
return is_wow64 ? context : NULL;
}
/***********************************************************************
* NtSetContextThread (NTDLL.@)
* ZwSetContextThread (NTDLL.@)
*/
NTSTATUS WINAPI NtSetContextThread( HANDLE handle, const CONTEXT *context )
{
NTSTATUS ret = STATUS_SUCCESS;
struct syscall_frame *frame = x86_thread_data()->syscall_frame;
DWORD flags = context->ContextFlags & ~CONTEXT_i386;
BOOL self = (handle == GetCurrentThread());
if ((flags & CONTEXT_XSTATE) && (cpu_info.ProcessorFeatureBits & CPU_FEATURE_AVX))
{
CONTEXT_EX *context_ex = (CONTEXT_EX *)(context + 1);
XSTATE *xs = (XSTATE *)((char *)context_ex + context_ex->XState.Offset);
if (context_ex->XState.Length < offsetof(XSTATE, YmmContext) ||
context_ex->XState.Length > sizeof(XSTATE))
return STATUS_INVALID_PARAMETER;
if ((xs->Mask & XSTATE_MASK_GSSE) && (context_ex->XState.Length < sizeof(XSTATE)))
return STATUS_BUFFER_OVERFLOW;
}
else flags &= ~CONTEXT_XSTATE;
/* debug registers require a server call */
if (self && (flags & CONTEXT_DEBUG_REGISTERS))
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)
{
ret = set_thread_context( handle, context, &self, IMAGE_FILE_MACHINE_I386 );
if (ret || !self) return ret;
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_INTEGER)
{
frame->eax = context->Eax;
frame->ebx = context->Ebx;
frame->ecx = context->Ecx;
frame->edx = context->Edx;
frame->esi = context->Esi;
frame->edi = context->Edi;
}
if (flags & CONTEXT_CONTROL)
{
frame->esp = context->Esp;
frame->ebp = context->Ebp;
frame->eip = context->Eip;
frame->eflags = context->EFlags;
frame->cs = context->SegCs;
frame->ss = context->SegSs;
}
if (flags & CONTEXT_SEGMENTS)
{
frame->ds = context->SegDs;
frame->es = context->SegEs;
frame->fs = context->SegFs;
frame->gs = context->SegGs;
}
if (flags & CONTEXT_EXTENDED_REGISTERS)
{
memcpy( &frame->u.xsave, context->ExtendedRegisters, sizeof(frame->u.xsave) );
/* reset the current interrupt status */
frame->u.xsave.StatusWord &= frame->u.xsave.ControlWord | 0xff80;
frame->xstate.Mask |= XSTATE_MASK_LEGACY;
}
else if (flags & CONTEXT_FLOATING_POINT)
{
if (cpu_info.ProcessorFeatureBits & CPU_FEATURE_FXSR)
{
fpu_to_fpux( &frame->u.xsave, &context->FloatSave );
}
else
{
frame->u.fsave = context->FloatSave;
}
frame->xstate.Mask |= XSTATE_MASK_LEGACY_FLOATING_POINT;
}
if (flags & CONTEXT_XSTATE)
{
CONTEXT_EX *context_ex = (CONTEXT_EX *)(context + 1);
XSTATE *xs = (XSTATE *)((char *)context_ex + context_ex->XState.Offset);
if (xs->Mask & XSTATE_MASK_GSSE)
{
frame->xstate.Mask |= XSTATE_MASK_GSSE;
frame->xstate.YmmContext = xs->YmmContext;
}
else frame->xstate.Mask &= ~XSTATE_MASK_GSSE;
}
frame->restore_flags |= flags & ~CONTEXT_INTEGER;
return STATUS_SUCCESS;
}
/***********************************************************************
* 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 WINAPI NtGetContextThread( HANDLE handle, CONTEXT *context )
{
struct syscall_frame *frame = x86_thread_data()->syscall_frame;
DWORD needed_flags = context->ContextFlags & ~CONTEXT_i386;
BOOL self = (handle == GetCurrentThread());
NTSTATUS ret;
/* debug registers require a server call */
if (needed_flags & CONTEXT_DEBUG_REGISTERS) self = FALSE;
if (!self)
{
if ((ret = get_thread_context( handle, context, &self, IMAGE_FILE_MACHINE_I386 ))) return ret;
}
if (self)
{
if (needed_flags & CONTEXT_INTEGER)
{
context->Eax = frame->eax;
context->Ebx = frame->ebx;
context->Ecx = frame->ecx;
context->Edx = frame->edx;
context->Esi = frame->esi;
context->Edi = frame->edi;
context->ContextFlags |= CONTEXT_INTEGER;
}
if (needed_flags & CONTEXT_CONTROL)
{
context->Esp = frame->esp;
context->Ebp = frame->ebp;
context->Eip = frame->eip;
context->EFlags = frame->eflags;
context->SegCs = frame->cs;
context->SegSs = frame->ss;
context->ContextFlags |= CONTEXT_CONTROL;
}
if (needed_flags & CONTEXT_SEGMENTS)
{
context->SegDs = frame->ds;
context->SegEs = frame->es;
context->SegFs = frame->fs;
context->SegGs = frame->gs;
context->ContextFlags |= CONTEXT_SEGMENTS;
}
if (needed_flags & CONTEXT_FLOATING_POINT)
{
if (!(cpu_info.ProcessorFeatureBits & CPU_FEATURE_FXSR))
{
context->FloatSave = frame->u.fsave;
}
else if (!xstate_compaction_enabled ||
(frame->xstate.Mask & XSTATE_MASK_LEGACY_FLOATING_POINT))
{
fpux_to_fpu( &context->FloatSave, &frame->u.xsave );
}
else
{
memset( &context->FloatSave, 0, sizeof(context->FloatSave) );
context->FloatSave.ControlWord = 0x37f;
}
context->ContextFlags |= CONTEXT_FLOATING_POINT;
}
if (needed_flags & CONTEXT_EXTENDED_REGISTERS)
{
XSAVE_FORMAT *xs = (XSAVE_FORMAT *)context->ExtendedRegisters;
if (!xstate_compaction_enabled ||
(frame->xstate.Mask & XSTATE_MASK_LEGACY_FLOATING_POINT))
{
memcpy( xs, &frame->u.xsave, FIELD_OFFSET( XSAVE_FORMAT, MxCsr ));
memcpy( xs->FloatRegisters, frame->u.xsave.FloatRegisters,
sizeof( xs->FloatRegisters ));
}
else
{
memset( xs, 0, FIELD_OFFSET( XSAVE_FORMAT, MxCsr ));
memset( xs->FloatRegisters, 0, sizeof( xs->FloatRegisters ));
xs->ControlWord = 0x37f;
}
if (!xstate_compaction_enabled || (frame->xstate.Mask & XSTATE_MASK_LEGACY_SSE))
{
memcpy( xs->XmmRegisters, frame->u.xsave.XmmRegisters, sizeof( xs->XmmRegisters ));
xs->MxCsr = frame->u.xsave.MxCsr;
xs->MxCsr_Mask = frame->u.xsave.MxCsr_Mask;
}
else
{
memset( xs->XmmRegisters, 0, sizeof( xs->XmmRegisters ));
xs->MxCsr = 0x1f80;
xs->MxCsr_Mask = 0x2ffff;
}
context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
}
if ((needed_flags & CONTEXT_XSTATE) && (cpu_info.ProcessorFeatureBits & CPU_FEATURE_AVX))
{
CONTEXT_EX *context_ex = (CONTEXT_EX *)(context + 1);
XSTATE *xstate = (XSTATE *)((char *)context_ex + context_ex->XState.Offset);
unsigned int mask;
if (context_ex->XState.Length < offsetof(XSTATE, YmmContext)
|| context_ex->XState.Length > sizeof(XSTATE))
return STATUS_INVALID_PARAMETER;
mask = (xstate_compaction_enabled ? xstate->CompactionMask : xstate->Mask) & XSTATE_MASK_GSSE;
xstate->Mask = frame->xstate.Mask & mask;
xstate->CompactionMask = xstate_compaction_enabled ? (0x8000000000000000 | mask) : 0;
memset( xstate->Reserved, 0, sizeof(xstate->Reserved) );
if (xstate->Mask)
{
if (context_ex->XState.Length < sizeof(XSTATE)) return STATUS_BUFFER_OVERFLOW;
xstate->YmmContext = frame->xstate.YmmContext;
}
}
/* update the cached version of the debug registers */
if (needed_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 (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;
}
/***********************************************************************
* set_thread_wow64_context
*/
NTSTATUS set_thread_wow64_context( HANDLE handle, const void *ctx, ULONG size )
{
return STATUS_INVALID_INFO_CLASS;
}
/***********************************************************************
* get_thread_wow64_context
*/
NTSTATUS get_thread_wow64_context( HANDLE handle, void *ctx, ULONG size )
{
return STATUS_INVALID_INFO_CLASS;
}
/***********************************************************************
* 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 );
GS_sig(sigcontext) = system_gs;
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, EXCEPTION_RECORD *rec, CONTEXT *context )
{
const union atl_thunk *thunk = (const union atl_thunk *)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 *)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 *)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 *)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 void *setup_exception_record( ucontext_t *sigcontext, EXCEPTION_RECORD *rec, struct xcontext *xcontext )
{
void *stack = init_handler( sigcontext );
rec->ExceptionAddress = (void *)EIP_sig( sigcontext );
save_context( xcontext, sigcontext );
return stack;
}
/***********************************************************************
* setup_raise_exception
*
* Change context to setup a call to a raise exception function.
*/
static void setup_raise_exception( ucontext_t *sigcontext, void *stack_ptr,
EXCEPTION_RECORD *rec, struct xcontext *xcontext )
{
CONTEXT *context = &xcontext->c;
size_t stack_size;
XSTATE *src_xs;
struct stack_layout
{
EXCEPTION_RECORD *rec_ptr; /* first arg for KiUserExceptionDispatcher */
CONTEXT *context_ptr; /* second arg for KiUserExceptionDispatcher */
CONTEXT context;
CONTEXT_EX context_ex;
EXCEPTION_RECORD rec;
DWORD ebp;
DWORD eip;
char xstate[0];
} *stack;
C_ASSERT( (offsetof(struct stack_layout, xstate) == sizeof(struct stack_layout)) );
NTSTATUS status = send_debug_event( rec, context, TRUE );
if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
{
restore_context( xcontext, sigcontext );
return;
}
/* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
stack_size = sizeof(*stack);
if ((src_xs = xstate_from_context( context )))
{
stack_size += (ULONG_PTR)stack_ptr - (((ULONG_PTR)stack_ptr
- sizeof(XSTATE)) & ~(ULONG_PTR)63);
}
stack = virtual_setup_exception( stack_ptr, stack_size, rec );
stack->rec = *rec;
stack->context = *context;
if (src_xs)
{
XSTATE *dst_xs = (XSTATE *)stack->xstate;
assert(!((ULONG_PTR)dst_xs & 63));
context_init_xstate( &stack->context, stack->xstate );
memset( dst_xs, 0, offsetof(XSTATE, YmmContext) );
dst_xs->CompactionMask = xstate_compaction_enabled ? 0x8000000000000004 : 0;
if (src_xs->Mask & 4)
{
dst_xs->Mask = 4;
memcpy( &dst_xs->YmmContext, &src_xs->YmmContext, sizeof(dst_xs->YmmContext) );
}
}
stack->rec_ptr = &stack->rec;
stack->context_ptr = &stack->context;
ESP_sig(sigcontext) = (DWORD)stack;
EIP_sig(sigcontext) = (DWORD)pKiUserExceptionDispatcher;
/* 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();
}
/***********************************************************************
* setup_exception
*
* Do the full setup to raise an exception from an exception record.
*/
static void setup_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec )
{
struct xcontext xcontext;
void *stack = setup_exception_record( sigcontext, rec, &xcontext );
setup_raise_exception( sigcontext, stack, rec, &xcontext );
}
/* stack layout when calling an user apc function.
* FIXME: match Windows ABI. */
struct apc_stack_layout
{
CONTEXT *context_ptr;
ULONG_PTR arg1;
ULONG_PTR arg2;
ULONG_PTR arg3;
PNTAPCFUNC func;
CONTEXT context;
};
/***********************************************************************
* call_user_apc_dispatcher
*/
NTSTATUS call_user_apc_dispatcher( CONTEXT *context, ULONG_PTR arg1, ULONG_PTR arg2, ULONG_PTR arg3,
PNTAPCFUNC func, NTSTATUS status )
{
struct syscall_frame *frame = x86_thread_data()->syscall_frame;
ULONG esp = context ? context->Esp : frame->esp;
struct apc_stack_layout *stack = (struct apc_stack_layout *)esp - 1;
if (!context)
{
stack->context.ContextFlags = CONTEXT_FULL;
NtGetContextThread( GetCurrentThread(), &stack->context );
stack->context.Eax = status;
}
else memmove( &stack->context, context, sizeof(stack->context) );
stack->context_ptr = &stack->context;
stack->arg1 = arg1;
stack->arg2 = arg2;
stack->arg3 = arg3;
stack->func = func;
frame->ebp = stack->context.Ebp;
frame->esp = (ULONG)stack - 4;
frame->eip = (ULONG)pKiUserApcDispatcher;
return status;
}
/***********************************************************************
* call_raise_user_exception_dispatcher
*/
void call_raise_user_exception_dispatcher(void)
{
x86_thread_data()->syscall_frame->eip = (DWORD)pKiRaiseUserExceptionDispatcher;
}
/***********************************************************************
* call_user_exception_dispatcher
*/
NTSTATUS call_user_exception_dispatcher( EXCEPTION_RECORD *rec, CONTEXT *context )
{
struct syscall_frame *frame = x86_thread_data()->syscall_frame;
void **stack = (void **)frame->esp;
if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
*(--stack) = context;
*(--stack) = rec;
frame->esp = (ULONG)stack;
frame->eip = (ULONG)pKiUserExceptionDispatcher;
return STATUS_SUCCESS;
}
struct user_callback_frame
{
struct syscall_frame frame;
void **ret_ptr;
ULONG *ret_len;
__wine_jmp_buf jmpbuf;
NTSTATUS status;
};
/***********************************************************************
* KeUserModeCallback
*/
NTSTATUS WINAPI KeUserModeCallback( ULONG id, const void *args, ULONG len, void **ret_ptr, ULONG *ret_len )
{
struct user_callback_frame callback_frame = { { 0 }, ret_ptr, ret_len };
if ((char *)ntdll_get_thread_data()->kernel_stack + min_kernel_stack > (char *)&callback_frame)
return STATUS_STACK_OVERFLOW;
if (!__wine_setjmpex( &callback_frame.jmpbuf, NULL ))
{
struct syscall_frame *frame = x86_thread_data()->syscall_frame;
void *args_data = (void *)((frame->esp - len) & ~15);
ULONG_PTR *stack = args_data;
memcpy( args_data, args, len );
*(--stack) = 0;
*(--stack) = len;
*(--stack) = (ULONG_PTR)args_data;
*(--stack) = id;
*(--stack) = 0xdeadbabe;
callback_frame.frame.esp = (ULONG_PTR)stack;
callback_frame.frame.eip = (ULONG_PTR)pKiUserCallbackDispatcher;
callback_frame.frame.eflags = 0x202;
callback_frame.frame.syscall_flags = __wine_syscall_flags;
callback_frame.frame.prev_frame = frame;
x86_thread_data()->syscall_frame = &callback_frame.frame;
__wine_syscall_dispatcher_return( &callback_frame.frame, 0 );
}
return callback_frame.status;
}
/***********************************************************************
* NtCallbackReturn (NTDLL.@)
*/
NTSTATUS WINAPI NtCallbackReturn( void *ret_ptr, ULONG ret_len, NTSTATUS status )
{
struct user_callback_frame *frame = (struct user_callback_frame *)x86_thread_data()->syscall_frame;
if (!frame->frame.prev_frame) return STATUS_NO_CALLBACK_ACTIVE;
*frame->ret_ptr = ret_ptr;
*frame->ret_len = ret_len;
frame->status = status;
x86_thread_data()->syscall_frame = frame->frame.prev_frame;
__wine_longjmp( &frame->jmpbuf, 1 );
}
/**********************************************************************
* 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, void *stack,
EXCEPTION_RECORD *rec, struct xcontext *xcontext )
{
CONTEXT *context = &xcontext->c;
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 (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;
}
}
context->Eip += 3;
rec->ExceptionCode = EXCEPTION_BREAKPOINT;
rec->ExceptionAddress = (void *)context->Eip;
rec->NumberParameters = is_wow64 ? 1 : 3;
rec->ExceptionInformation[0] = context->Eax;
rec->ExceptionInformation[1] = context->Ecx;
rec->ExceptionInformation[2] = context->Edx;
setup_raise_exception( sigcontext, stack, rec, xcontext );
return TRUE;
default:
return FALSE;
}
}
/***********************************************************************
* handle_syscall_fault
*
* Handle a page fault happening during a system call.
*/
static BOOL handle_syscall_fault( ucontext_t *sigcontext, void *stack_ptr,
EXCEPTION_RECORD *rec, CONTEXT *context )
{
struct syscall_frame *frame = x86_thread_data()->syscall_frame;
DWORD i, *stack;
if (!is_inside_syscall( sigcontext )) return FALSE;
TRACE( "code=%x flags=%x addr=%p ip=%08x tid=%04x\n",
rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
context->Eip, GetCurrentThreadId() );
for (i = 0; i < rec->NumberParameters; i++)
TRACE( " info[%d]=%08lx\n", i, rec->ExceptionInformation[i] );
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 );
if (ntdll_get_thread_data()->jmp_buf)
{
TRACE( "returning to handler\n" );
/* push stack frame for calling __wine_longjmp */
stack = stack_ptr;
*(--stack) = 1;
*(--stack) = (DWORD)ntdll_get_thread_data()->jmp_buf;
*(--stack) = 0xdeadbabe; /* return address */
ESP_sig(sigcontext) = (DWORD)stack;
EIP_sig(sigcontext) = (DWORD)__wine_longjmp;
ntdll_get_thread_data()->jmp_buf = NULL;
}
else
{
TRACE( "returning to user mode ip=%08x ret=%08x\n", frame->eip, rec->ExceptionCode );
stack = (DWORD *)frame;
*(--stack) = rec->ExceptionCode;
*(--stack) = (DWORD)frame;
*(--stack) = 0xdeadbabe; /* return address */
ESP_sig(sigcontext) = (DWORD)stack;
EIP_sig(sigcontext) = (DWORD)__wine_syscall_dispatcher_return;
}
return TRUE;
}
/***********************************************************************
* handle_syscall_trap
*
* Handle a trap exception during a system call.
*/
static BOOL handle_syscall_trap( ucontext_t *sigcontext )
{
extern void __wine_syscall_dispatcher_prolog_end(void);
struct syscall_frame *frame = x86_thread_data()->syscall_frame;
/* disallow single-stepping through a syscall */
if ((void *)EIP_sig( sigcontext ) != __wine_syscall_dispatcher) return FALSE;
TRACE( "ignoring trap in syscall eip=%08x eflags=%08x\n", EIP_sig(sigcontext), EFL_sig(sigcontext) );
frame->eip = *(ULONG *)ESP_sig( sigcontext );
frame->eflags = EFL_sig(sigcontext);
frame->restore_flags = CONTEXT_CONTROL;
EIP_sig( sigcontext ) = (ULONG)__wine_syscall_dispatcher_prolog_end;
ECX_sig( sigcontext ) = (ULONG)frame;
ESP_sig( sigcontext ) += sizeof(ULONG);
EFL_sig( sigcontext ) &= ~0x100; /* clear single-step flag */
return TRUE;
}
/**********************************************************************
* segv_handler
*
* Handler for SIGSEGV and related errors.
*/
static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
EXCEPTION_RECORD rec = { 0 };
struct xcontext xcontext;
ucontext_t *ucontext = sigcontext;
void *stack = setup_exception_record( sigcontext, &rec, &xcontext );
switch (TRAP_sig(ucontext))
{
case TRAP_x86_OFLOW: /* Overflow exception */
rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
break;
case TRAP_x86_BOUND: /* Bound range exception */
rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
break;
case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
case TRAP_x86_STKFLT: /* Stack fault */
rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
break;
case TRAP_x86_SEGNPFLT: /* Segment not present exception */
case TRAP_x86_PROTFLT: /* General protection fault */
{
WORD err = ERROR_sig(ucontext);
if (!err && (rec.ExceptionCode = is_privileged_instr( &xcontext.c ))) break;
if ((err & 7) == 2 && handle_interrupt( err >> 3, ucontext, stack, &rec, &xcontext )) return;
rec.ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
rec.NumberParameters = 2;
rec.ExceptionInformation[0] = 0;
/* if error contains a LDT selector, use that as fault address */
if ((err & 7) == 4 && !ldt_is_system( err | 7 )) rec.ExceptionInformation[1] = err & ~7;
else
{
rec.ExceptionInformation[1] = 0xffffffff;
if (check_invalid_gs( ucontext, &xcontext.c )) return;
}
}
break;
case TRAP_x86_PAGEFLT: /* Page fault */
rec.NumberParameters = 2;
rec.ExceptionInformation[0] = (ERROR_sig(ucontext) >> 1) & 0x09;
rec.ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
rec.ExceptionCode = virtual_handle_fault( siginfo->si_addr, rec.ExceptionInformation[0], stack );
if (!rec.ExceptionCode) return;
if (rec.ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
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( ucontext, &rec, &xcontext.c ))
return;
/* send EXCEPTION_EXECUTE_FAULT only if data execution prevention is enabled */
if (!(flags & MEM_EXECUTE_OPTION_DISABLE)) rec.ExceptionInformation[0] = EXCEPTION_READ_FAULT;
}
break;
case TRAP_x86_ALIGNFLT: /* Alignment check exception */
/* FIXME: pass through exception handler first? */
if (xcontext.c.EFlags & 0x00040000)
{
EFL_sig(ucontext) &= ~0x00040000; /* disable AC flag */
return;
}
rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
break;
default:
WINE_ERR( "Got unexpected trap %d\n", TRAP_sig(ucontext) );
/* 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 */
rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
break;
}
if (handle_syscall_fault( ucontext, stack, &rec, &xcontext.c )) return;
setup_raise_exception( ucontext, stack, &rec, &xcontext );
}
/**********************************************************************
* trap_handler
*
* Handler for SIGTRAP.
*/
static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
EXCEPTION_RECORD rec = { 0 };
struct xcontext xcontext;
ucontext_t *ucontext = sigcontext;
void *stack = setup_exception_record( sigcontext, &rec, &xcontext );
if (handle_syscall_trap( ucontext )) return;
switch (TRAP_sig(ucontext))
{
case TRAP_x86_TRCTRAP: /* Single-step exception */
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 (!(xcontext.c.EFlags & 0x100) || (xcontext.c.Dr7 & 0xff))
{
/* (possible) hardware breakpoint, fetch the debug registers */
DWORD saved_flags = xcontext.c.ContextFlags;
xcontext.c.ContextFlags = CONTEXT_DEBUG_REGISTERS;
NtGetContextThread( GetCurrentThread(), &xcontext.c );
xcontext.c.ContextFlags |= saved_flags; /* restore flags */
}
xcontext.c.EFlags &= ~0x100; /* clear single-step flag */
break;
case TRAP_x86_BPTFLT: /* Breakpoint exception */
rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
/* fall through */
default:
rec.ExceptionCode = EXCEPTION_BREAKPOINT;
rec.NumberParameters = is_wow64 ? 1 : 3;
rec.ExceptionInformation[0] = 0;
rec.ExceptionInformation[1] = 0; /* FIXME */
rec.ExceptionInformation[2] = 0; /* FIXME */
break;
}
setup_raise_exception( sigcontext, stack, &rec, &xcontext );
}
/**********************************************************************
* fpe_handler
*
* Handler for SIGFPE.
*/
static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
EXCEPTION_RECORD rec = { 0 };
struct xcontext xcontext;
ucontext_t *ucontext = sigcontext;
void *stack = setup_exception_record( sigcontext, &rec, &xcontext );
switch (TRAP_sig(ucontext))
{
case TRAP_x86_DIVIDE: /* Division by zero exception */
rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
break;
case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
case TRAP_x86_ARITHTRAP: /* Floating point exception */
rec.ExceptionCode = get_fpu_code( &xcontext.c );
rec.ExceptionAddress = (void *)xcontext.c.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);
rec.ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
rec.ExceptionInformation[rec.NumberParameters++] = 0;
if (is_wow64) rec.ExceptionInformation[rec.NumberParameters++] = ((XSAVE_FORMAT *)xcontext.c.ExtendedRegisters)->MxCsr;
break;
default:
WINE_ERR( "Got unexpected trap %d\n", TRAP_sig(ucontext) );
rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
break;
}
setup_raise_exception( sigcontext, stack, &rec, &xcontext );
}
/**********************************************************************
* int_handler
*
* Handler for SIGINT.
*/
static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
HANDLE handle;
init_handler( sigcontext );
if (!p__wine_ctrl_routine) return;
if (!NtCreateThreadEx( &handle, THREAD_ALL_ACCESS, NULL, NtCurrentProcess(),
p__wine_ctrl_routine, 0 /* CTRL_C_EVENT */, 0, 0, 0, 0, NULL ))
NtClose( handle );
}
/**********************************************************************
* abrt_handler
*
* Handler for SIGABRT.
*/
static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
EXCEPTION_RECORD rec = { EXCEPTION_WINE_ASSERTION, EH_NONCONTINUABLE };
setup_exception( sigcontext, &rec );
}
/**********************************************************************
* quit_handler
*
* Handler for SIGQUIT.
*/
static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
init_handler( sigcontext );
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 )
{
struct xcontext xcontext;
init_handler( sigcontext );
if (is_inside_syscall( sigcontext ))
{
DECLSPEC_ALIGN(64) XSTATE xs;
xcontext.c.ContextFlags = CONTEXT_FULL;
context_init_xstate( &xcontext.c, &xs );
NtGetContextThread( GetCurrentThread(), &xcontext.c );
wait_suspend( &xcontext.c );
NtSetContextThread( GetCurrentThread(), &xcontext.c );
}
else
{
save_context( &xcontext, sigcontext );
wait_suspend( &xcontext.c );
restore_context( &xcontext, sigcontext );
}
}
/***********************************************************************
* 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 pthread_mutex_t ldt_mutex = PTHREAD_MUTEX_INITIALIZER;
static const LDT_ENTRY null_entry;
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_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 = page_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 )
{
sigset_t sigset;
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;
server_enter_uninterrupted_section( &ldt_mutex, &sigset );
if (sel1) ldt_set_entry( sel1, entry1 );
if (sel2) ldt_set_entry( sel2, entry2 );
server_leave_uninterrupted_section( &ldt_mutex, &sigset );
return STATUS_SUCCESS;
}
/**********************************************************************
* signal_init_threading
*/
void signal_init_threading(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
}
/**********************************************************************
* signal_alloc_thread
*/
NTSTATUS signal_alloc_thread( TEB *teb )
{
struct x86_thread_data *thread_data = (struct x86_thread_data *)&teb->GdiTebBatch;
if (!gdt_fs_sel)
{
static int first_thread = 1;
sigset_t sigset;
int idx;
LDT_ENTRY entry = ldt_make_entry( teb, page_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 );
first_thread = 0;
}
else
{
server_enter_uninterrupted_section( &ldt_mutex, &sigset );
for (idx = first_ldt_entry; idx < LDT_SIZE; idx++)
{
if (__wine_ldt_copy.flags[idx]) continue;
ldt_set_entry( (idx << 3) | 7, entry );
break;
}
server_leave_uninterrupted_section( &ldt_mutex, &sigset );
if (idx == LDT_SIZE) return STATUS_TOO_MANY_THREADS;
}
thread_data->fs = (idx << 3) | 7;
}
else thread_data->fs = gdt_fs_sel;
teb->WOW32Reserved = __wine_syscall_dispatcher;
return STATUS_SUCCESS;
}
/**********************************************************************
* signal_free_thread
*/
void signal_free_thread( TEB *teb )
{
struct x86_thread_data *thread_data = (struct x86_thread_data *)&teb->GdiTebBatch;
sigset_t sigset;
if (gdt_fs_sel) return;
server_enter_uninterrupted_section( &ldt_mutex, &sigset );
__wine_ldt_copy.flags[thread_data->fs >> 3] = 0;
server_leave_uninterrupted_section( &ldt_mutex, &sigset );
}
/**********************************************************************
* 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->GdiTebBatch;
ldt_set_fs( thread_data->fs, teb );
thread_data->gs = get_gs();
__asm__ volatile ("fninit; fldcw %0" : : "m" (fpu_cw));
}
/**********************************************************************
* signal_init_process
*/
void signal_init_process(void)
{
struct sigaction sig_act;
void *kernel_stack = (char *)ntdll_get_thread_data()->kernel_stack + kernel_stack_size;
x86_thread_data()->syscall_frame = (struct syscall_frame *)kernel_stack - 1;
if (cpu_info.ProcessorFeatureBits & CPU_FEATURE_FXSR) __wine_syscall_flags |= SYSCALL_HAVE_FXSAVE;
if (cpu_info.ProcessorFeatureBits & CPU_FEATURE_XSAVE) __wine_syscall_flags |= SYSCALL_HAVE_XSAVE;
if (xstate_compaction_enabled) __wine_syscall_flags |= SYSCALL_HAVE_XSAVEC;
sig_act.sa_mask = server_block_set;
sig_act.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
#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 = trap_handler;
if (sigaction( SIGTRAP, &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;
if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
return;
error:
perror("sigaction");
exit(1);
}
/***********************************************************************
* call_init_thunk
*/
void DECLSPEC_HIDDEN call_init_thunk( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend, TEB *teb )
{
struct x86_thread_data *thread_data = (struct x86_thread_data *)&teb->GdiTebBatch;
struct syscall_frame *frame = thread_data->syscall_frame;
CONTEXT *ctx, context = { CONTEXT_ALL };
DWORD *stack;
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)teb->Tib.StackBase - 16;
context.Eip = (DWORD)pRtlUserThreadStart;
context.FloatSave.ControlWord = 0x27f;
((XSAVE_FORMAT *)context.ExtendedRegisters)->ControlWord = 0x27f;
((XSAVE_FORMAT *)context.ExtendedRegisters)->MxCsr = 0x1f80;
if ((ctx = get_cpu_area( IMAGE_FILE_MACHINE_I386 ))) *ctx = context;
if (suspend) wait_suspend( &context );
ctx = (CONTEXT *)((ULONG_PTR)context.Esp & ~3) - 1;
*ctx = context;
ctx->ContextFlags = CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
memset( frame, 0, sizeof(*frame) );
NtSetContextThread( GetCurrentThread(), ctx );
stack = (DWORD *)ctx;
*(--stack) = 0;
*(--stack) = 0;
*(--stack) = 0;
*(--stack) = (DWORD)ctx;
*(--stack) = 0xdeadbabe;
frame->esp = (DWORD)stack;
frame->eip = (DWORD)pLdrInitializeThunk;
frame->prev_frame = NULL;
frame->syscall_flags = __wine_syscall_flags;
frame->restore_flags |= CONTEXT_INTEGER;
pthread_sigmask( SIG_UNBLOCK, &server_block_set, NULL );
__wine_syscall_dispatcher_return( frame, 0 );
}
/***********************************************************************
* signal_start_thread
*/
__ASM_GLOBAL_FUNC( signal_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 20(%ebp),%ecx\n\t" /* teb */
"movl %ebp,0x1f4(%ecx)\n\t" /* x86_thread_data()->exit_frame */
/* set syscall frame */
"movl 0x1f8(%ecx),%eax\n\t" /* x86_thread_data()->syscall_frame */
"orl %eax,%eax\n\t"
"jnz 1f\n\t"
"leal -0x380(%esp),%eax\n\t" /* sizeof(struct syscall_frame) */
"andl $~63,%eax\n\t"
"movl %eax,0x1f8(%ecx)\n" /* x86_thread_data()->syscall_frame */
"1:\tmovl %eax,%esp\n\t"
"pushl %ecx\n\t" /* teb */
"pushl 16(%ebp)\n\t" /* suspend */
"pushl 12(%ebp)\n\t" /* arg */
"pushl 8(%ebp)\n\t" /* entry */
"call " __ASM_NAME("call_init_thunk") )
/***********************************************************************
* signal_exit_thread
*/
__ASM_GLOBAL_FUNC( signal_exit_thread,
"movl 8(%esp),%ecx\n\t"
"movl 12(%esp),%esi\n\t"
"xorl %edx,%edx\n\t"
/* fetch exit frame */
"xchgl %edx,0x1f4(%esi)\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 %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" )
/**********************************************************************
* NtCurrentTeb (NTDLL.@)
*/
__ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
#endif /* __i386__ */
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