/* * 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 #include #include #include #include #include #ifdef HAVE_UNISTD_H # include #endif #ifdef HAVE_SYS_PARAM_H # include #endif #ifdef HAVE_SYSCALL_H # include #else # ifdef HAVE_SYS_SYSCALL_H # include # endif #endif #ifdef HAVE_SYS_SIGNAL_H # include #endif #ifdef HAVE_SYS_UCONTEXT_H # include #endif #include "ntstatus.h" #define WIN32_NO_STATUS #include "windef.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 */ /* 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(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) #include #include #include #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 #include #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 #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 */ #elif defined (__APPLE__) #include /* 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 #include #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 #include #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; }; static const size_t teb_size = 4096; /* we reserve one page for the TEB */ 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 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)); } /*********************************************************************** * 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_signal_stack * * Get the base of the signal stack for the current thread. */ static inline void *get_signal_stack(void) { return (char *)NtCurrentTeb() + 4096; } /*********************************************************************** * 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); } #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 ) { 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->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 ) { 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) ); } /*********************************************************************** * save_fpux * * Save the thread FPU extended context. */ static inline void save_fpux( CONTEXT *context ) { /* 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); context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS; __asm__ __volatile__( "fxsave %0" : "=m" (*state) ); memcpy( context->ExtendedRegisters, state, sizeof(*state) ); } /*********************************************************************** * 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; __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) ); } /*********************************************************************** * restore_fpux * * Restore the FPU extended context to a sigcontext. */ static inline void restore_fpux( const CONTEXT *context ) { /* 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) ); } /*********************************************************************** * 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 ) { 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 = 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) { 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; FS_sig(sigcontext) = context->SegFs; GS_sig(sigcontext) = context->SegGs; SS_sig(sigcontext) = context->SegSs; if (fpu) *fpu = context->FloatSave; if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) ); if (!fpu && !fpux) restore_fpu( context ); } /*********************************************************************** * 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" ) /*********************************************************************** * 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; DWORD flags = context->ContextFlags & ~CONTEXT_i386; BOOL self = (handle == GetCurrentThread()); /* 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) { context_t server_context; context_to_server( &server_context, context ); ret = set_thread_context( handle, &server_context, &self ); 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_EXTENDED_REGISTERS) restore_fpux( context ); else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context ); 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 ); } } 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 WINAPI NtGetContextThread( 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->Ecx = 0; context->Edx = 0; /* other registers already set from asm wrapper */ context->ContextFlags |= CONTEXT_INTEGER; } if (needed_flags & CONTEXT_CONTROL) { context->SegCs = get_cs(); context->SegSs = get_ds(); /* other registers already set from asm wrapper */ 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; } /*********************************************************************** * 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, 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 ) { 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 ); 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 ) { void *stack = init_handler( sigcontext ); return setup_exception_record( sigcontext, stack ); } /*********************************************************************** * 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, &stack->context, TRUE ); if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED) { restore_context( &stack->context, sigcontext ); return; } ESP_sig(sigcontext) = (DWORD)stack; EIP_sig(sigcontext) = (DWORD)KiUserExceptionDispatcher; /* 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; /* KiUserExceptionDispatcher must not return */ stack->rec_ptr = &stack->rec; /* arguments for KiUserExceptionDispatcher */ 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 ) { struct stack_layout *stack; ucontext_t *context = sigcontext; void *stack_ptr = init_handler( sigcontext ); /* check for exceptions on the signal stack caused by write watches */ if (TRAP_sig(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, (ERROR_sig(context) >> 1) & 0x09, TRUE )) { return; } /* check for page fault inside the thread stack */ if (TRAP_sig(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 ); stack->rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW; goto done; } } stack = setup_exception_record( context, stack_ptr ); if (stack->rec.ExceptionCode == EXCEPTION_STACK_OVERFLOW) goto done; switch (TRAP_sig(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 */ { WORD err = ERROR_sig(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] = (ERROR_sig(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", TRAP_sig(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 (TRAP_sig(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 (TRAP_sig(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 */ 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", TRAP_sig(context) ); stack->rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION; break; } setup_raise_exception( context, stack ); } /********************************************************************** * int_handler * * Handler for SIGINT. */ static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { struct stack_layout *stack = setup_exception( sigcontext ); 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 ) { 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 ) { CONTEXT context; init_handler( sigcontext ); save_context( &context, sigcontext ); wait_suspend( &context ); restore_context( &context, 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 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 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 = 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 CDECL 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_section, &sigset ); if (sel1) ldt_set_entry( sel1, entry1 ); if (sel2) ldt_set_entry( sel2, entry2 ); server_leave_uninterrupted_section( &ldt_section, &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->SystemReserved2; if (!gdt_fs_sel) { static int first_thread = 1; sigset_t sigset; int idx; LDT_ENTRY 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 ); first_thread = 0; } else { server_enter_uninterrupted_section( &ldt_section, &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_section, &sigset ); if (idx == LDT_SIZE) return STATUS_TOO_MANY_THREADS; } thread_data->fs = (idx << 3) | 7; } else thread_data->fs = gdt_fs_sel; return STATUS_SUCCESS; } /********************************************************************** * signal_free_thread */ void signal_free_thread( TEB *teb ) { struct x86_thread_data *thread_data = (struct x86_thread_data *)teb->SystemReserved2; sigset_t sigset; if (gdt_fs_sel) return; server_enter_uninterrupted_section( &ldt_section, &sigset ); __wine_ldt_copy.flags[thread_data->fs >> 3] = 0; server_leave_uninterrupted_section( &ldt_section, &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->SystemReserved2; stack_t ss; 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(); __asm__ volatile ("fninit; fldcw %0" : : "m" (fpu_cw)); } /********************************************************************** * 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 | 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); } /*********************************************************************** * 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 ); } pthread_sigmask( SIG_UNBLOCK, &server_block_set, NULL ); ctx->ContextFlags = CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS; LdrInitializeThunk( ctx, (void **)&ctx->Eax, 0, 0 ); return ctx; } /*********************************************************************** * 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 %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 $1,4(%esp)\n\t" "movl %esi,(%esp)\n\t" "call " __ASM_NAME("NtContinue") ) /*********************************************************************** * signal_exit_thread */ __ASM_GLOBAL_FUNC( signal_exit_thread, "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" ) /********************************************************************** * NtCurrentTeb (NTDLL.@) */ __ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" ) #endif /* __i386__ */