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rpcrt4: Reimplement the stubless proxy entry point entirely in assembly.

This commit is contained in:
Alexandre Julliard 2011-06-15 12:26:35 +02:00
parent 779a8fcddb
commit 915a0769e5
1 changed files with 26 additions and 30 deletions
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56
dlls/rpcrt4/cproxy.c
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@ -71,46 +71,42 @@ static inline StdProxyImpl *impl_from_proxy_obj( void *iface )
#ifdef __i386__ #ifdef __i386__
#include "pshpack1.h"
struct thunk {
BYTE mov_eax;
DWORD index;
BYTE jmp;
LONG handler;
};
#include "poppack.h"
extern void call_stubless_func(void); extern void call_stubless_func(void);
__ASM_GLOBAL_FUNC(call_stubless_func, __ASM_GLOBAL_FUNC(call_stubless_func,
"pushl %eax\n\t" /* method index */ "movl 4(%esp),%ecx\n\t" /* This pointer */
"movl (%ecx),%ecx\n\t" /* This->lpVtbl */
"movl -8(%ecx),%ecx\n\t" /* MIDL_STUBLESS_PROXY_INFO */
"movl 8(%ecx),%edx\n\t" /* info->FormatStringOffset */
"movzwl (%edx,%eax,2),%edx\n\t" /* FormatStringOffset[index] */
"addl 4(%ecx),%edx\n\t" /* info->ProcFormatString + offset */
"movzwl 8(%edx),%eax\n\t" /* arguments size */
"pushl %eax\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl %esp\n\t" /* pointer to index */ "leal 8(%esp),%eax\n\t" /* &This */
"pushl %eax\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"call " __ASM_NAME("ObjectStubless") __ASM_STDCALL(4) "\n\t" "pushl %edx\n\t" /* format string */
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t") __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"popl %edx\n\t" /* args size */ "pushl (%ecx)\n\t" /* info->pStubDesc */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"call " __ASM_NAME("ndr_client_call") "\n\t"
"leal 12(%esp),%esp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset -12\n\t")
"popl %edx\n\t" /* arguments size */
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t") __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
"movl (%esp),%ecx\n\t" /* return address */ "movl (%esp),%ecx\n\t" /* return address */
"addl %edx,%esp\n\t" "addl %edx,%esp\n\t"
"jmp *%ecx" ); "jmp *%ecx" );
LONG_PTR WINAPI ObjectStubless(void **args) #include "pshpack1.h"
struct thunk
{ {
DWORD index = (DWORD)args[0]; BYTE mov_eax;
void **iface = (void **)args[2]; DWORD index;
const void **vtbl = (const void **)*iface; BYTE jmp;
const MIDL_STUBLESS_PROXY_INFO *stubless = *(const MIDL_STUBLESS_PROXY_INFO **)(vtbl - 2); LONG handler;
const PFORMAT_STRING fs = stubless->ProcFormatString + stubless->FormatStringOffset[index]; };
DWORD arg_size = *(const WORD*)(fs + 8); #include "poppack.h"
/* store bytes to remove from stack */
args[0] = (void *)arg_size;
TRACE("(%p)->(%d)([%d bytes]) ret=%p\n", iface, index, arg_size, args[1]);
return ndr_client_call(stubless->pStubDesc, fs, args + 2);
}
static inline void init_thunk( struct thunk *thunk, unsigned int index ) static inline void init_thunk( struct thunk *thunk, unsigned int index )
{ {