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ntdll: Use the context argument as working variable instead of making a copy in RtlUnwindEx.

oldstable
Alexandre Julliard 2012-03-12 11:08:10 +01:00
parent bbb1bc3eee
commit de9330cbcb
1 changed files with 45 additions and 47 deletions
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92
dlls/ntdll/signal_x86_64.c
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@ -2885,17 +2885,18 @@ static void call_teb_unwind_handler( EXCEPTION_RECORD *rec, DISPATCHER_CONTEXT *
* RtlUnwindEx (NTDLL.@)
*/
void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec,
PVOID retval, CONTEXT *orig_context, UNWIND_HISTORY_TABLE *table )
PVOID retval, CONTEXT *context, UNWIND_HISTORY_TABLE *table )
{
EXCEPTION_REGISTRATION_RECORD *teb_frame = NtCurrentTeb()->Tib.ExceptionList;
EXCEPTION_RECORD record;
DISPATCHER_CONTEXT dispatch;
CONTEXT context, new_context;
CONTEXT new_context;
LDR_MODULE *module;
NTSTATUS status;
DWORD size;
RtlCaptureContext( orig_context );
RtlCaptureContext( context );
new_context = *context;
/* build an exception record, if we do not have one */
if (!rec)
@ -2903,7 +2904,7 @@ void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec
record.ExceptionCode = STATUS_UNWIND;
record.ExceptionFlags = 0;
record.ExceptionRecord = NULL;
record.ExceptionAddress = (void *)orig_context->Rip;
record.ExceptionAddress = (void *)context->Rip;
record.NumberParameters = 0;
rec = &record;
}
@ -2911,26 +2912,23 @@ void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec
rec->ExceptionFlags |= EH_UNWINDING | (end_frame ? 0 : EH_EXIT_UNWIND);
TRACE( "code=%x flags=%x end_frame=%p target_ip=%p rip=%016lx\n",
rec->ExceptionCode, rec->ExceptionFlags, end_frame, target_ip, orig_context->Rip );
rec->ExceptionCode, rec->ExceptionFlags, end_frame, target_ip, context->Rip );
TRACE(" rax=%016lx rbx=%016lx rcx=%016lx rdx=%016lx\n",
orig_context->Rax, orig_context->Rbx, orig_context->Rcx, orig_context->Rdx );
context->Rax, context->Rbx, context->Rcx, context->Rdx );
TRACE(" rsi=%016lx rdi=%016lx rbp=%016lx rsp=%016lx\n",
orig_context->Rsi, orig_context->Rdi, orig_context->Rbp, orig_context->Rsp );
context->Rsi, context->Rdi, context->Rbp, context->Rsp );
TRACE(" r8=%016lx r9=%016lx r10=%016lx r11=%016lx\n",
orig_context->R8, orig_context->R9, orig_context->R10, orig_context->R11 );
context->R8, context->R9, context->R10, context->R11 );
TRACE(" r12=%016lx r13=%016lx r14=%016lx r15=%016lx\n",
orig_context->R12, orig_context->R13, orig_context->R14, orig_context->R15 );
context->R12, context->R13, context->R14, context->R15 );
context = *orig_context;
dispatch.EstablisherFrame = context.Rsp;
dispatch.EstablisherFrame = context->Rsp;
dispatch.TargetIp = (ULONG64)target_ip;
dispatch.ContextRecord = &context;
dispatch.ContextRecord = context;
dispatch.HistoryTable = table;
while (dispatch.EstablisherFrame != (ULONG64)end_frame)
{
new_context = context;
/* FIXME: should use the history table to make things faster */
module = NULL;
@ -2939,7 +2937,7 @@ void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec
/* first look for PE exception information */
if (!LdrFindEntryForAddress( (void *)context.Rip, &module ))
if (!LdrFindEntryForAddress( (void *)context->Rip, &module ))
{
RUNTIME_FUNCTION *dir;
@ -2947,11 +2945,11 @@ void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec
if ((dir = RtlImageDirectoryEntryToData( module->BaseAddress, TRUE,
IMAGE_DIRECTORY_ENTRY_EXCEPTION, &size )))
{
if ((dispatch.FunctionEntry = find_function_info( context.Rip, module->BaseAddress,
if ((dispatch.FunctionEntry = find_function_info( context->Rip, module->BaseAddress,
dir, size )))
{
dispatch.LanguageHandler = RtlVirtualUnwind( UNW_FLAG_UHANDLER, dispatch.ImageBase,
context.Rip, dispatch.FunctionEntry,
context->Rip, dispatch.FunctionEntry,
&new_context, &dispatch.HandlerData,
&dispatch.EstablisherFrame, NULL );
goto unwind_done;
@ -2966,12 +2964,12 @@ void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec
if (!module || (module->Flags & LDR_WINE_INTERNAL))
{
struct dwarf_eh_bases bases;
const struct dwarf_fde *fde = _Unwind_Find_FDE( (void *)(context.Rip - 1), &bases );
const struct dwarf_fde *fde = _Unwind_Find_FDE( (void *)(context->Rip - 1), &bases );
if (fde)
{
dispatch.FunctionEntry = NULL;
status = dwarf_virtual_unwind( context.Rip, &dispatch.EstablisherFrame, &new_context, fde,
status = dwarf_virtual_unwind( context->Rip, &dispatch.EstablisherFrame, &new_context, fde,
&bases, &dispatch.LanguageHandler, &dispatch.HandlerData );
if (status != STATUS_SUCCESS) raise_status( status, rec );
if (dispatch.LanguageHandler && !module)
@ -2985,8 +2983,8 @@ void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec
/* no exception information, treat as a leaf function */
new_context.Rip = *(ULONG64 *)context.Rsp;
new_context.Rsp = context.Rsp + sizeof(ULONG64);
new_context.Rip = *(ULONG64 *)context->Rsp;
new_context.Rsp = context->Rsp + sizeof(ULONG64);
dispatch.EstablisherFrame = new_context.Rsp;
dispatch.LanguageHandler = NULL;
@ -2997,7 +2995,7 @@ void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec
{
TRACE( "frame %lx is inside signal stack (%p-%p)\n", dispatch.EstablisherFrame,
get_signal_stack(), (char *)get_signal_stack() + signal_stack_size );
context = new_context;
*context = new_context;
continue;
}
@ -3033,37 +3031,37 @@ void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec
dispatch.EstablisherFrame = new_context.Rsp;
}
context = new_context;
*context = new_context;
}
if (rec->ExceptionCode == STATUS_LONGJUMP && rec->NumberParameters >= 1)
{
struct MSVCRT_JUMP_BUFFER *jmp = (struct MSVCRT_JUMP_BUFFER *)rec->ExceptionInformation[0];
context.Rbx = jmp->Rbx;
context.Rsp = jmp->Rsp;
context.Rbp = jmp->Rbp;
context.Rsi = jmp->Rsi;
context.Rdi = jmp->Rdi;
context.R12 = jmp->R12;
context.R13 = jmp->R13;
context.R14 = jmp->R14;
context.R15 = jmp->R15;
context.Rip = jmp->Rip;
context.u.s.Xmm6 = jmp->Xmm6;
context.u.s.Xmm7 = jmp->Xmm7;
context.u.s.Xmm8 = jmp->Xmm8;
context.u.s.Xmm9 = jmp->Xmm9;
context.u.s.Xmm10 = jmp->Xmm10;
context.u.s.Xmm11 = jmp->Xmm11;
context.u.s.Xmm12 = jmp->Xmm12;
context.u.s.Xmm13 = jmp->Xmm13;
context.u.s.Xmm14 = jmp->Xmm14;
context.u.s.Xmm15 = jmp->Xmm15;
context->Rbx = jmp->Rbx;
context->Rsp = jmp->Rsp;
context->Rbp = jmp->Rbp;
context->Rsi = jmp->Rsi;
context->Rdi = jmp->Rdi;
context->R12 = jmp->R12;
context->R13 = jmp->R13;
context->R14 = jmp->R14;
context->R15 = jmp->R15;
context->Rip = jmp->Rip;
context->u.s.Xmm6 = jmp->Xmm6;
context->u.s.Xmm7 = jmp->Xmm7;
context->u.s.Xmm8 = jmp->Xmm8;
context->u.s.Xmm9 = jmp->Xmm9;
context->u.s.Xmm10 = jmp->Xmm10;
context->u.s.Xmm11 = jmp->Xmm11;
context->u.s.Xmm12 = jmp->Xmm12;
context->u.s.Xmm13 = jmp->Xmm13;
context->u.s.Xmm14 = jmp->Xmm14;
context->u.s.Xmm15 = jmp->Xmm15;
}
context.Rax = (ULONG64)retval;
context.Rip = (ULONG64)target_ip;
TRACE( "returning to %lx stack %lx\n", context.Rip, context.Rsp );
set_cpu_context( &context );
context->Rax = (ULONG64)retval;
context->Rip = (ULONG64)target_ip;
TRACE( "returning to %lx stack %lx\n", context->Rip, context->Rsp );
set_cpu_context( context );
}