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wow64cpu: Save non-volatile registers before switching to 32-bit code.

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To make it possible to unwind the stack.
This commit is contained in:
Alexandre Julliard 2024-03-22 13:06:40 +01:00
parent d91f16a24a
commit 567b31d7f3
1 changed files with 27 additions and 14 deletions
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41
dlls/wow64cpu/cpu.c
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@ -175,9 +175,12 @@ static void copy_context_64to32( I386_CONTEXT *ctx32, DWORD flags, AMD64_CONTEXT
extern void WINAPI syscall_32to64(void);
__ASM_GLOBAL_FUNC( syscall_32to64,
/* cf. BTCpuSimulate prolog */
__ASM_SEH(".seh_stackalloc 0x28\n\t")
__ASM_SEH(".seh_endprologue\n\t")
__ASM_CFI(".cfi_adjust_cfa_offset 0x28\n\t")
".seh_pushreg %rbp\n\t"
".seh_pushreg %rbx\n\t"
".seh_pushreg %rsi\n\t"
".seh_pushreg %rdi\n\t"
".seh_stackalloc 0x28\n\t"
".seh_endprologue\n\t"
"xchgq %r14,%rsp\n\t"
"movl %edi,0x9c(%r13)\n\t" /* context->Edi */
"movl %esi,0xa0(%r13)\n\t" /* context->Esi */
@ -238,9 +241,12 @@ __ASM_GLOBAL_FUNC( syscall_32to64,
extern void WINAPI unix_call_32to64(void);
__ASM_GLOBAL_FUNC( unix_call_32to64,
/* cf. BTCpuSimulate prolog */
__ASM_SEH(".seh_stackalloc 0x28\n\t")
__ASM_SEH(".seh_endprologue\n\t")
__ASM_CFI(".cfi_adjust_cfa_offset 0x28\n\t")
".seh_pushreg %rbp\n\t"
".seh_pushreg %rbx\n\t"
".seh_pushreg %rsi\n\t"
".seh_pushreg %rdi\n\t"
".seh_stackalloc 0x28\n\t"
".seh_endprologue\n\t"
"xchgq %r14,%rsp\n\t"
"movl %edi,0x9c(%r13)\n\t" /* context->Edi */
"movl %esi,0xa0(%r13)\n\t" /* context->Esi */
@ -269,14 +275,21 @@ __ASM_GLOBAL_FUNC( unix_call_32to64,
* BTCpuSimulate (wow64cpu.@)
*/
__ASM_GLOBAL_FUNC( BTCpuSimulate,
"subq $0x28,%rsp\n"
__ASM_SEH(".seh_stackalloc 0x28\n\t")
__ASM_SEH(".seh_endprologue\n\t")
__ASM_CFI(".cfi_adjust_cfa_offset 0x28\n\t")
"movq %gs:0x30,%r12\n\t"
"movq 0x1488(%r12),%rcx\n\t" /* NtCurrentTeb()->TlsSlots[WOW64_TLS_CPURESERVED] */
"leaq 4(%rcx),%r13\n" /* cpu->Context */
"jmp syscall_32to64_return\n" )
"pushq %rbp\n\t"
".seh_pushreg %rbp\n\t"
"pushq %rbx\n\t"
".seh_pushreg %rbx\n\t"
"pushq %rsi\n\t"
".seh_pushreg %rsi\n\t"
"pushq %rdi\n\t"
".seh_pushreg %rdi\n\t"
"subq $0x28,%rsp\n"
".seh_stackalloc 0x28\n\t"
".seh_endprologue\n\t"
"movq %gs:0x30,%r12\n\t"
"movq 0x1488(%r12),%rcx\n\t" /* NtCurrentTeb()->TlsSlots[WOW64_TLS_CPURESERVED] */
"leaq 4(%rcx),%r13\n" /* cpu->Context */
"jmp syscall_32to64_return\n" )
/**********************************************************************