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ntdll: Add support for dynamically generated stub entry points. 

Based on a patch by Maarten Lankhorst.
This commit is contained in:
Alexandre Julliard 2008-12-16 12:25:07 +01:00
parent ce63574425
commit ccdfa4941e
1 changed files with 37 additions and 13 deletions
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50
dlls/ntdll/loader.c
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@ -172,24 +172,20 @@ static inline BOOL call_dll_entry_point( DLLENTRYPROC proc, void *module,
#endif /* __i386__ */
#ifdef __i386__
#if defined(__i386__) || defined(__x86_64__)
/*************************************************************************
* stub_entry_point
*
* Entry point for stub functions.
*/
static void stub_entry_point( const char *dll, const char *name, ... )
static void stub_entry_point( const char *dll, const char *name, void *ret_addr )
{
EXCEPTION_RECORD rec;
rec.ExceptionCode = EXCEPTION_WINE_STUB;
rec.ExceptionFlags = EH_NONCONTINUABLE;
rec.ExceptionRecord = NULL;
#ifdef __GNUC__
rec.ExceptionAddress = __builtin_return_address(0);
#else
rec.ExceptionAddress = *((void **)&dll - 1);
#endif
rec.ExceptionAddress = ret_addr;
rec.NumberParameters = 2;
rec.ExceptionInformation[0] = (ULONG_PTR)dll;
rec.ExceptionInformation[1] = (ULONG_PTR)name;
@ -198,17 +194,29 @@ static void stub_entry_point( const char *dll, const char *name, ... )
#include "pshpack1.h"
#ifdef __i386__
struct stub
{
BYTE popl_eax; /* popl %eax */
BYTE pushl1; /* pushl $name */
const char *name;
BYTE pushl2; /* pushl $dll */
const char *dll;
BYTE pushl_eax; /* pushl %eax */
BYTE jmp; /* jmp stub_entry_point */
BYTE call; /* call stub_entry_point */
DWORD entry;
};
#else
struct stub
{
BYTE movq_rdi[2]; /* movq $dll,%rdi */
const char *dll;
BYTE movq_rsi[2]; /* movq $name,%rsi */
const char *name;
BYTE movq_rsp_rdx[4]; /* movq (%rsp),%rdx */
BYTE movq_rax[2]; /* movq $entry, %rax */
const void* entry;
BYTE jmpq_rax[2]; /* jmp %rax */
};
#endif
#include "poppack.h"
/*************************************************************************
@ -233,14 +241,30 @@ static ULONG_PTR allocate_stub( const char *dll, const char *name )
return 0xdeadbeef;
}
stub = &stubs[nb_stubs++];
stub->popl_eax = 0x58; /* popl %eax */
#ifdef __i386__
stub->pushl1 = 0x68; /* pushl $name */
stub->name = name;
stub->pushl2 = 0x68; /* pushl $dll */
stub->dll = dll;
stub->pushl_eax = 0x50; /* pushl %eax */
stub->jmp = 0xe9; /* jmp stub_entry_point */
stub->call = 0xe8; /* call stub_entry_point */
stub->entry = (BYTE *)stub_entry_point - (BYTE *)(&stub->entry + 1);
#else
stub->movq_rdi[0] = 0x48; /* movq $dll,%rdi */
stub->movq_rdi[1] = 0xbf;
stub->dll = dll;
stub->movq_rsi[0] = 0x48; /* movq $name,%rsi */
stub->movq_rsi[1] = 0xbe;
stub->name = name;
stub->movq_rsp_rdx[0] = 0x48; /* movq (%rsp),%rdx */
stub->movq_rsp_rdx[1] = 0x8b;
stub->movq_rsp_rdx[2] = 0x14;
stub->movq_rsp_rdx[3] = 0x24;
stub->movq_rax[0] = 0x48; /* movq $entry, %rax */
stub->movq_rax[1] = 0xb8;
stub->entry = stub_entry_point;
stub->jmpq_rax[0] = 0xff; /* jmp %rax */
stub->jmpq_rax[1] = 0xe0;
#endif
return (ULONG_PTR)stub;
}