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Fix GDB backtrace

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svn path=/trunk/; revision=18038
This commit is contained in:
Gé van Geldorp 2005-09-25 00:00:03 +00:00
parent 3c14414c1d
commit e8bb7ed8ff
1 changed files with 32 additions and 0 deletions
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32
reactos/ntoskrnl/ke/i386/syscall.S
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@ -255,6 +255,22 @@ SharedCode:
mov ebx, [ebp+KTRAP_FRAME_EBP]
mov edi, [ebp+KTRAP_FRAME_EIP]
#ifdef DBG
/*
* We want to know the address from where the syscall stub was called.
* If PrevMode is KernelMode, that address is stored in our own (kernel)
* stack, at location KTRAP_FRAME_ESP.
* If we're coming from UserMode, we load the usermode stack pointer
* and go back two frames (first frame is the syscall stub, second call
* is the caller of the stub).
*/
mov edi, [ebp+KTRAP_FRAME_ESP]
test byte ptr [esi+KTHREAD_PREVIOUS_MODE], 0x01
jz PrevWasKernelMode
mov edi, [edi+4]
PrevWasKernelMode:
#endif
/* Write the debug data */
mov [ebp+KTRAP_FRAME_DEBUGPOINTER], edx
mov dword ptr [ebp+KTRAP_FRAME_DEBUGARGMARK], 0xBADB0D00
@ -334,6 +350,22 @@ NotWin32K:
mov edi, esp
rep movsd
#ifdef DBG
/*
* The following lines are for the benefit of GDB. It will see the return
* address of the "call ebx" below, find the last label before it and
* thinks that that's the start of the function. It will then check to see
* if it starts with a standard function prolog (push ebp, mov ebp,esp).
* When that standard function prolog is not found, it will stop the
* stack backtrace. Since we do want to backtrace into usermode, let's
* make GDB happy and create a standard prolog.
*/
KiSystemService:
push ebp
mov ebp,esp
pop ebp
#endif
/* Do the System Call */
call ebx