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ntdll: Reimplement the i386 relay entry point in assembler.

This commit is contained in:
Alexandre Julliard 2013-05-23 13:16:23 +02:00
parent f4e58868d4
commit fb75238f7e
1 changed files with 58 additions and 9 deletions
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67
dlls/ntdll/relay.c
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@ -416,15 +416,64 @@ __ASM_GLOBAL_FUNC( call_entry_point,
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret" )
static LONGLONG WINAPI relay_call( struct relay_descr *descr, unsigned int idx, const INT_PTR *stack )
{
BYTE nb_args = LOBYTE(HIWORD(idx));
BYTE flags = HIBYTE(HIWORD(idx));
void *func = relay_trace_entry( descr, idx, stack );
LONGLONG ret = call_entry_point( func, nb_args, stack + 1, flags );
relay_trace_exit( descr, idx, stack, ret );
return ret;
}
extern LONGLONG WINAPI relay_call( struct relay_descr *descr, unsigned int idx, const INT_PTR *stack );
__ASM_GLOBAL_FUNC( relay_call,
"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 %esi\n\t"
__ASM_CFI(".cfi_rel_offset %esi,-4\n\t")
"pushl %edi\n\t"
__ASM_CFI(".cfi_rel_offset %edi,-8\n\t")
"pushl %ecx\n\t"
__ASM_CFI(".cfi_rel_offset %ecx,-12\n\t")
/* trace the parameters */
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"call " __ASM_NAME("relay_trace_entry") "\n\t"
/* copy the arguments*/
"movzbl 14(%ebp),%ecx\n\t" /* number of args */
"jecxz 1f\n\t"
"leal 0(,%ecx,4),%edx\n\t"
"subl %edx,%esp\n\t"
"andl $~15,%esp\n\t"
"movl 16(%ebp),%esi\n\t"
"addl $4,%esi\n\t"
"movl %esp,%edi\n\t"
"cld\n\t"
"rep; movsl\n\t"
"testb $2,15(%ebp)\n\t" /* (flags & 2) -> thiscall */
"jz 1f\n\t"
"popl %ecx\n"
/* call the entry point */
"1:\tcall *%eax\n\t"
"movl %eax,%esi\n\t"
"movl %edx,%edi\n\t"
/* trace the return value */
"leal -20(%ebp),%esp\n\t"
"pushl %edx\n\t"
"pushl %eax\n\t"
"pushl 16(%ebp)\n\t"
"pushl 12(%ebp)\n\t"
"pushl 8(%ebp)\n\t"
"call " __ASM_NAME("relay_trace_exit") "\n\t"
/* restore return value and return */
"leal -12(%ebp),%esp\n\t"
"movl %esi,%eax\n\t"
"movl %edi,%edx\n\t"
"popl %ecx\n\t"
__ASM_CFI(".cfi_same_value %ecx\n\t")
"popl %edi\n\t"
__ASM_CFI(".cfi_same_value %edi\n\t")
"popl %esi\n\t"
__ASM_CFI(".cfi_same_value %esi\n\t")
"popl %ebp\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret $12" )
void WINAPI __regs_relay_call_regs( struct relay_descr *descr, unsigned int idx,
unsigned int orig_eax, unsigned int ret_addr,