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wine-wine/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>
#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 "wine/asm.h"
#include "wine/exception.h"
#include "unix_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
/* 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__
struct modify_ldt_s
{
unsigned int entry_number;
void *base_addr;
unsigned int limit;
unsigned int seg_32bit : 1;
unsigned int contents : 2;
unsigned int read_exec_only : 1;
unsigned int limit_in_pages : 1;
unsigned int seg_not_present : 1;
unsigned int usable : 1;
unsigned int garbage : 25;
};
static inline int modify_ldt( int func, struct modify_ldt_s *ptr, unsigned long count )
{
return syscall( 123 /* SYS_modify_ldt */, func, ptr, count );
}
static inline int set_thread_area( struct modify_ldt_s *ptr )
{
return syscall( 243 /* SYS_set_thread_area */, ptr );
}
#elif defined (__BSDI__)
#include <machine/frame.h>
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
#include <machine/trap.h>
#include <machine/segments.h>
#include <machine/sysarch.h>
#elif defined (__OpenBSD__)
#include <machine/segments.h>
#include <machine/sysarch.h>
#elif defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
#if defined(_SCO_DS) || defined(__sun)
#include <sys/regset.h>
#endif
#elif defined (__APPLE__)
#include <i386/user_ldt.h>
#elif defined(__NetBSD__)
#include <machine/segments.h>
#include <machine/sysarch.h>
#elif defined(__GNU__)
#include <mach/i386/mach_i386.h>
#include <mach/mach_traps.h>
#else
#error You must define the signal context functions for your platform
#endif /* linux */
static const size_t teb_size = 4096; /* we reserve one page for the TEB */
static ULONG first_ldt_entry = 32;
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)); }
/***********************************************************************
* is_gdt_sel
*/
static inline int is_gdt_sel( WORD sel )
{
return !(sel & 4);
}
/***********************************************************************
* 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) );
}
/***********************************************************************
* set_full_cpu_context
*
* Set the new CPU context.
*/
extern void set_full_cpu_context( const CONTEXT *context );
__ASM_GLOBAL_FUNC( set_full_cpu_context,
"movl 4(%esp),%ecx\n\t"
"movw 0x8c(%ecx),%gs\n\t" /* SegGs */
"movw 0x90(%ecx),%fs\n\t" /* SegFs */
"movw 0x94(%ecx),%es\n\t" /* SegEs */
"movl 0x9c(%ecx),%edi\n\t" /* Edi */
"movl 0xa0(%ecx),%esi\n\t" /* Esi */
"movl 0xa4(%ecx),%ebx\n\t" /* Ebx */
"movl 0xb4(%ecx),%ebp\n\t" /* Ebp */
"movw %ss,%ax\n\t"
"cmpw 0xc8(%ecx),%ax\n\t" /* SegSs */
"jne 1f\n\t"
/* As soon as we have switched stacks the context structure could
* be invalid (when signal handlers are executed for example). Copy
* values on the target stack before changing ESP. */
"movl 0xc4(%ecx),%eax\n\t" /* Esp */
"leal -4*4(%eax),%eax\n\t"
"movl 0xc0(%ecx),%edx\n\t" /* EFlags */
"movl %edx,3*4(%eax)\n\t"
"movl 0xbc(%ecx),%edx\n\t" /* SegCs */
"movl %edx,2*4(%eax)\n\t"
"movl 0xb8(%ecx),%edx\n\t" /* Eip */
"movl %edx,1*4(%eax)\n\t"
"movl 0xb0(%ecx),%edx\n\t" /* Eax */
"movl %edx,0*4(%eax)\n\t"
"pushl 0x98(%ecx)\n\t" /* SegDs */
"movl 0xa8(%ecx),%edx\n\t" /* Edx */
"movl 0xac(%ecx),%ecx\n\t" /* Ecx */
"popl %ds\n\t"
"movl %eax,%esp\n\t"
"popl %eax\n\t"
"iret\n"
/* Restore the context when the stack segment changes. We can't use
* the same code as above because we do not know if the stack segment
* is 16 or 32 bit, and 'movl' will throw an exception when we try to
* access memory above the limit. */
"1:\n\t"
"movl 0xa8(%ecx),%edx\n\t" /* Edx */
"movl 0xb0(%ecx),%eax\n\t" /* Eax */
"movw 0xc8(%ecx),%ss\n\t" /* SegSs */
"movl 0xc4(%ecx),%esp\n\t" /* Esp */
"pushl 0xc0(%ecx)\n\t" /* EFlags */
"pushl 0xbc(%ecx)\n\t" /* SegCs */
"pushl 0xb8(%ecx)\n\t" /* Eip */
"pushl 0x98(%ecx)\n\t" /* SegDs */
"movl 0xac(%ecx),%ecx\n\t" /* Ecx */
"popl %ds\n\t"
"iret" )
/***********************************************************************
* set_cpu_context
*
* Set the new CPU context. Used by NtSetContextThread.
*/
void DECLSPEC_HIDDEN set_cpu_context( const CONTEXT *context )
{
DWORD flags = context->ContextFlags & ~CONTEXT_i386;
if (flags & CONTEXT_EXTENDED_REGISTERS) restore_fpux( context );
else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
if (flags & CONTEXT_DEBUG_REGISTERS)
{
x86_thread_data()->dr0 = context->Dr0;
x86_thread_data()->dr1 = context->Dr1;
x86_thread_data()->dr2 = context->Dr2;
x86_thread_data()->dr3 = context->Dr3;
x86_thread_data()->dr6 = context->Dr6;
x86_thread_data()->dr7 = context->Dr7;
}
if (flags & CONTEXT_FULL)
{
if (!(flags & CONTEXT_CONTROL))
FIXME( "setting partial context (%x) not supported\n", flags );
else if (flags & CONTEXT_SEGMENTS)
set_full_cpu_context( context );
else
{
CONTEXT newcontext = *context;
newcontext.SegDs = get_ds();
newcontext.SegEs = get_ds();
newcontext.SegFs = get_fs();
newcontext.SegGs = get_gs();
set_full_cpu_context( &newcontext );
}
}
}
/***********************************************************************
* get_server_context_flags
*
* Convert CPU-specific flags to generic server flags
*/
static unsigned int get_server_context_flags( DWORD flags )
{
unsigned int ret = 0;
flags &= ~CONTEXT_i386; /* get rid of CPU id */
if (flags & CONTEXT_CONTROL) ret |= SERVER_CTX_CONTROL;
if (flags & CONTEXT_INTEGER) ret |= SERVER_CTX_INTEGER;
if (flags & CONTEXT_SEGMENTS) ret |= SERVER_CTX_SEGMENTS;
if (flags & CONTEXT_FLOATING_POINT) ret |= SERVER_CTX_FLOATING_POINT;
if (flags & CONTEXT_DEBUG_REGISTERS) ret |= SERVER_CTX_DEBUG_REGISTERS;
if (flags & CONTEXT_EXTENDED_REGISTERS) ret |= SERVER_CTX_EXTENDED_REGISTERS;
return ret;
}
/***********************************************************************
* context_to_server
*
* Convert a register context to the server format.
*/
NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
{
DWORD flags = from->ContextFlags & ~CONTEXT_i386; /* get rid of CPU id */
memset( to, 0, sizeof(*to) );
to->cpu = CPU_x86;
if (flags & CONTEXT_CONTROL)
{
to->flags |= SERVER_CTX_CONTROL;
to->ctl.i386_regs.ebp = from->Ebp;
to->ctl.i386_regs.esp = from->Esp;
to->ctl.i386_regs.eip = from->Eip;
to->ctl.i386_regs.cs = from->SegCs;
to->ctl.i386_regs.ss = from->SegSs;
to->ctl.i386_regs.eflags = from->EFlags;
}
if (flags & CONTEXT_INTEGER)
{
to->flags |= SERVER_CTX_INTEGER;
to->integer.i386_regs.eax = from->Eax;
to->integer.i386_regs.ebx = from->Ebx;
to->integer.i386_regs.ecx = from->Ecx;
to->integer.i386_regs.edx = from->Edx;
to->integer.i386_regs.esi = from->Esi;
to->integer.i386_regs.edi = from->Edi;
}
if (flags & CONTEXT_SEGMENTS)
{
to->flags |= SERVER_CTX_SEGMENTS;
to->seg.i386_regs.ds = from->SegDs;
to->seg.i386_regs.es = from->SegEs;
to->seg.i386_regs.fs = from->SegFs;
to->seg.i386_regs.gs = from->SegGs;
}
if (flags & CONTEXT_FLOATING_POINT)
{
to->flags |= SERVER_CTX_FLOATING_POINT;
to->fp.i386_regs.ctrl = from->FloatSave.ControlWord;
to->fp.i386_regs.status = from->FloatSave.StatusWord;
to->fp.i386_regs.tag = from->FloatSave.TagWord;
to->fp.i386_regs.err_off = from->FloatSave.ErrorOffset;
to->fp.i386_regs.err_sel = from->FloatSave.ErrorSelector;
to->fp.i386_regs.data_off = from->FloatSave.DataOffset;
to->fp.i386_regs.data_sel = from->FloatSave.DataSelector;
to->fp.i386_regs.cr0npx = from->FloatSave.Cr0NpxState;
memcpy( to->fp.i386_regs.regs, from->FloatSave.RegisterArea, sizeof(to->fp.i386_regs.regs) );
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
to->flags |= SERVER_CTX_DEBUG_REGISTERS;
to->debug.i386_regs.dr0 = from->Dr0;
to->debug.i386_regs.dr1 = from->Dr1;
to->debug.i386_regs.dr2 = from->Dr2;
to->debug.i386_regs.dr3 = from->Dr3;
to->debug.i386_regs.dr6 = from->Dr6;
to->debug.i386_regs.dr7 = from->Dr7;
}
if (flags & CONTEXT_EXTENDED_REGISTERS)
{
to->flags |= SERVER_CTX_EXTENDED_REGISTERS;
memcpy( to->ext.i386_regs, from->ExtendedRegisters, sizeof(to->ext.i386_regs) );
}
return STATUS_SUCCESS;
}
/***********************************************************************
* context_from_server
*
* Convert a register context from the server format.
*/
NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
{
if (from->cpu != CPU_x86) return STATUS_INVALID_PARAMETER;
to->ContextFlags = CONTEXT_i386;
if (from->flags & SERVER_CTX_CONTROL)
{
to->ContextFlags |= CONTEXT_CONTROL;
to->Ebp = from->ctl.i386_regs.ebp;
to->Esp = from->ctl.i386_regs.esp;
to->Eip = from->ctl.i386_regs.eip;
to->SegCs = from->ctl.i386_regs.cs;
to->SegSs = from->ctl.i386_regs.ss;
to->EFlags = from->ctl.i386_regs.eflags;
}
if (from->flags & SERVER_CTX_INTEGER)
{
to->ContextFlags |= CONTEXT_INTEGER;
to->Eax = from->integer.i386_regs.eax;
to->Ebx = from->integer.i386_regs.ebx;
to->Ecx = from->integer.i386_regs.ecx;
to->Edx = from->integer.i386_regs.edx;
to->Esi = from->integer.i386_regs.esi;
to->Edi = from->integer.i386_regs.edi;
}
if (from->flags & SERVER_CTX_SEGMENTS)
{
to->ContextFlags |= CONTEXT_SEGMENTS;
to->SegDs = from->seg.i386_regs.ds;
to->SegEs = from->seg.i386_regs.es;
to->SegFs = from->seg.i386_regs.fs;
to->SegGs = from->seg.i386_regs.gs;
}
if (from->flags & SERVER_CTX_FLOATING_POINT)
{
to->ContextFlags |= CONTEXT_FLOATING_POINT;
to->FloatSave.ControlWord = from->fp.i386_regs.ctrl;
to->FloatSave.StatusWord = from->fp.i386_regs.status;
to->FloatSave.TagWord = from->fp.i386_regs.tag;
to->FloatSave.ErrorOffset = from->fp.i386_regs.err_off;
to->FloatSave.ErrorSelector = from->fp.i386_regs.err_sel;
to->FloatSave.DataOffset = from->fp.i386_regs.data_off;
to->FloatSave.DataSelector = from->fp.i386_regs.data_sel;
to->FloatSave.Cr0NpxState = from->fp.i386_regs.cr0npx;
memcpy( to->FloatSave.RegisterArea, from->fp.i386_regs.regs, sizeof(to->FloatSave.RegisterArea) );
}
if (from->flags & SERVER_CTX_DEBUG_REGISTERS)
{
to->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
to->Dr0 = from->debug.i386_regs.dr0;
to->Dr1 = from->debug.i386_regs.dr1;
to->Dr2 = from->debug.i386_regs.dr2;
to->Dr3 = from->debug.i386_regs.dr3;
to->Dr6 = from->debug.i386_regs.dr6;
to->Dr7 = from->debug.i386_regs.dr7;
}
if (from->flags & SERVER_CTX_EXTENDED_REGISTERS)
{
to->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
memcpy( to->ExtendedRegisters, from->ext.i386_regs, sizeof(to->ExtendedRegisters) );
}
return STATUS_SUCCESS;
}
/***********************************************************************
* NtSetContextThread (NTDLL.@)
* ZwSetContextThread (NTDLL.@)
*/
NTSTATUS WINAPI NtSetContextThread( HANDLE handle, const CONTEXT *context )
{
NTSTATUS ret = STATUS_SUCCESS;
BOOL self = (handle == GetCurrentThread());
/* debug registers require a server call */
if (self && (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386)))
self = (x86_thread_data()->dr0 == context->Dr0 &&
x86_thread_data()->dr1 == context->Dr1 &&
x86_thread_data()->dr2 == context->Dr2 &&
x86_thread_data()->dr3 == context->Dr3 &&
x86_thread_data()->dr6 == context->Dr6 &&
x86_thread_data()->dr7 == context->Dr7);
if (!self)
{
context_t server_context;
context_to_server( &server_context, context );
ret = set_thread_context( handle, &server_context, &self );
}
if (self && ret == STATUS_SUCCESS) set_cpu_context( context );
return ret;
}
/***********************************************************************
* NtGetContextThread (NTDLL.@)
* ZwGetContextThread (NTDLL.@)
*
* Note: we use a small assembly wrapper to save the necessary registers
* in case we are fetching the context of the current thread.
*/
NTSTATUS 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;
}
/***********************************************************************
* 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();
#ifdef __GNUC__
__asm__ volatile ("fninit; fldcw %0" : : "m" (fpu_cw));
#else
FIXME("FPU setup not implemented for this platform.\n");
#endif
}
/***********************************************************************
* init_thread_context
*/
static void init_thread_context( CONTEXT *context, LPTHREAD_START_ROUTINE entry, void *arg, void *relay )
{
context->SegCs = get_cs();
context->SegDs = get_ds();
context->SegEs = get_ds();
context->SegFs = get_fs();
context->SegGs = get_gs();
context->SegSs = get_ds();
context->EFlags = 0x202;
context->Eax = (DWORD)entry;
context->Ebx = (DWORD)arg;
context->Esp = (DWORD)NtCurrentTeb()->Tib.StackBase - 16;
context->Eip = (DWORD)relay;
context->FloatSave.ControlWord = 0x27f;
((XMM_SAVE_AREA32 *)context->ExtendedRegisters)->ControlWord = 0x27f;
((XMM_SAVE_AREA32 *)context->ExtendedRegisters)->MxCsr = 0x1f80;
}
/***********************************************************************
* attach_thread
*/
PCONTEXT DECLSPEC_HIDDEN attach_thread( LPTHREAD_START_ROUTINE entry, void *arg,
BOOL suspend, void *relay )
{
CONTEXT *ctx;
if (suspend)
{
CONTEXT context = { CONTEXT_ALL };
init_thread_context( &context, entry, arg, relay );
wait_suspend( &context );
ctx = (CONTEXT *)((ULONG_PTR)context.Esp & ~15) - 1;
*ctx = context;
}
else
{
ctx = (CONTEXT *)((char *)NtCurrentTeb()->Tib.StackBase - 16) - 1;
init_thread_context( ctx, entry, arg, relay );
}
ctx->ContextFlags = CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
LdrInitializeThunk( ctx, (void **)&ctx->Eax, 0, 0 );
return ctx;
}
/***********************************************************************
* signal_start_thread
*/
__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 %esi,(%esp)\n\t"
"call " __ASM_NAME("set_cpu_context") )
/***********************************************************************
* 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__ */
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