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Store %gs in the TEB on every call to 16-bit code, and don't restore 

it from the TEB for signals that did not happen in 16-bit code.
oldstable
Alexandre Julliard 2003-03-25 00:36:16 +00:00
parent c342de17b8
commit 78675ba234
3 changed files with 41 additions and 25 deletions
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58
dlls/ntdll/signal_i386.c
View File

@ -147,12 +147,14 @@ __ASM_GLOBAL_FUNC(vm86_enter,
"pushl %ebx\n\t"
"movl $1,%ebx\n\t" /*VM86_ENTER*/
"pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
"pushl %gs\n\t"
"pushl %fs\n\t"
"int $0x80\n"
".globl " __ASM_NAME("vm86_return") "\n\t"
__ASM_FUNC("vm86_return") "\n"
__ASM_NAME("vm86_return") ":\n\t"
"popl %fs\n\t"
"popl %gs\n\t"
"popl %ecx\n\t"
"popl %ebx\n\t"
"popl %ebp\n\t"
@ -538,14 +540,17 @@ static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct
*/
static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
{
WORD fs;
/* get %fs at time of the fault */
/* get %fs and %gs at time of the fault */
#ifdef FS_sig
fs = FS_sig(sigcontext);
context->SegFs = LOWORD(FS_sig(sigcontext));
#else
fs = wine_get_fs();
context->SegFs = wine_get_fs();
#endif
#ifdef GS_sig
context->SegGs = LOWORD(GS_sig(sigcontext));
#else
context->SegGs = wine_get_gs();
#endif
context->SegFs = fs;
/* now restore a proper %fs for the fault handler */
if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
@ -558,28 +563,36 @@ static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
* SS is still non-system segment. This is why both CS and SS
* are checked.
*/
fs = SYSLEVEL_Win16CurrentTeb;
wine_set_fs( SYSLEVEL_Win16CurrentTeb );
wine_set_gs( NtCurrentTeb()->gs_sel );
}
#ifdef __HAVE_VM86
else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
{
unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
/* fetch the saved %fs on the stack */
fs = *(unsigned int *)ESP_sig(sigcontext);
wine_set_fs( stack[0] );
wine_set_gs( stack[1] );
if (EAX_sig(sigcontext) == VM86_EAX) {
struct vm86plus_struct *vm86;
wine_set_fs(fs);
/* retrieve pointer to vm86plus struct that was stored in vm86_enter
* (but we could also get if from teb->vm86_ptr) */
vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
/* get context from vm86 struct */
save_vm86_context( context, vm86 );
wine_set_gs( NtCurrentTeb()->gs_sel );
return;
}
}
#endif /* __HAVE_VM86 */
wine_set_fs(fs);
else /* 32-bit mode */
{
#ifdef FS_sig
wine_set_fs( FS_sig(sigcontext) );
#endif
#ifdef GS_sig
wine_set_gs( GS_sig(sigcontext) );
#endif
}
context->Eax = EAX_sig(sigcontext);
context->Ebx = EBX_sig(sigcontext);
@ -595,12 +608,6 @@ static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
context->SegDs = LOWORD(DS_sig(sigcontext));
context->SegEs = LOWORD(ES_sig(sigcontext));
context->SegSs = LOWORD(SS_sig(sigcontext));
#ifdef GS_sig
context->SegGs = LOWORD(GS_sig(sigcontext));
#else
context->SegGs = wine_get_gs();
#endif
wine_set_gs( NtCurrentTeb()->gs_sel );
}
@ -617,9 +624,10 @@ static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
EAX_sig(sigcontext) == VM86_EAX)
{
unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
/* retrieve pointer to vm86plus struct that was stored in vm86_enter
* (but we could also get it from teb->vm86_ptr) */
struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
restore_vm86_context( context, vm86 );
return;
}
@ -664,21 +672,25 @@ static void init_handler( const SIGCONTEXT *sigcontext )
!IS_SELECTOR_SYSTEM(SS_sig(sigcontext))) /* 16-bit mode */
{
wine_set_fs( SYSLEVEL_Win16CurrentTeb );
wine_set_gs( NtCurrentTeb()->gs_sel );
}
#ifdef __HAVE_VM86
else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
{
/* fetch the saved %fs on the stack */
wine_set_fs( *(unsigned int *)ESP_sig(sigcontext) );
wine_set_gs( NtCurrentTeb()->gs_sel );
}
#endif /* __HAVE_VM86 */
#ifdef FS_sig
else /* 32-bit mode, get %fs at time of the fault */
{
#ifdef FS_sig
wine_set_fs( FS_sig(sigcontext) );
#endif
#ifdef GS_sig
wine_set_gs( GS_sig(sigcontext) );
#endif
}
#endif /* FS_sig */
wine_set_gs( NtCurrentTeb()->gs_sel );
}

1
scheduler/sysdeps.c
View File

@ -83,7 +83,6 @@ void SYSDEPS_SetCurThread( TEB *teb )
wine_ldt_set_limit( &fs_entry, 0xfff );
wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
wine_ldt_init_fs( teb->teb_sel, &fs_entry );
teb->gs_sel = wine_get_gs();
#elif defined(__powerpc__)
/* On PowerPC, the current TEB is in the gpr13 register */
__asm__ __volatile__("mr 2, %0" : : "r" (teb));

7
tools/winebuild/relay.c
View File

@ -489,6 +489,7 @@ static void BuildCallTo16Core( FILE *outfile, int reg_func )
fprintf( outfile, "\tpushl %%edx\n" );
fprintf( outfile, "\tpushl %%esi\n" );
fprintf( outfile, "\tpushl %%edi\n" );
fprintf( outfile, "\t.byte 0x64\n\tmovl %%gs,(%d)\n", STRUCTOFFSET(TEB,gs_sel) );
if ( UsePIC )
{
@ -672,6 +673,8 @@ static void BuildCallTo16Core( FILE *outfile, int reg_func )
fprintf( outfile, "\tmovw %%ax,%%es\n" );
fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(SegFs) );
fprintf( outfile, "\tmovw %%ax,%%fs\n" );
fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(SegGs) );
fprintf( outfile, "\tmovw %%ax,%%gs\n" );
fprintf( outfile, "\tmovl %d(%%edx),%%ebp\n", CONTEXTOFFSET(Ebp) );
fprintf( outfile, "\tmovl %d(%%edx),%%esi\n", CONTEXTOFFSET(Esi) );
fprintf( outfile, "\tmovl %d(%%edx),%%edi\n", CONTEXTOFFSET(Edi) );
@ -688,9 +691,11 @@ static void BuildCallTo16Core( FILE *outfile, int reg_func )
/* Push the called routine address */
fprintf( outfile, "\tpushl %d(%%edx)\n", STACK32OFFSET(target) );
/* Set %fs to the value saved by the last CallFrom16 */
/* Set %fs and %gs to the value saved by the last CallFrom16 */
fprintf( outfile, "\tmovw %d(%%ebp),%%ax\n", STACK16OFFSET(fs)-STACK16OFFSET(bp) );
fprintf( outfile, "\tmovw %%ax,%%fs\n" );
fprintf( outfile, "\tmovw %d(%%ebp),%%ax\n", STACK16OFFSET(gs)-STACK16OFFSET(bp) );
fprintf( outfile, "\tmovw %%ax,%%gs\n" );
/* Set %ds and %es (and %ax just in case) equal to %ss */
fprintf( outfile, "\tmovw %%ss,%%ax\n" );