178 lines
3.4 KiB
C
178 lines
3.4 KiB
C
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/*++
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Copyright (c) Microsoft Corporation. All rights reserved.
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Module Name:
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xprofile.c
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Abstract:
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XAPI profiling support functions
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Notes:
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We access the kernel's profiling data buffer directly.
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If the kernel's data structure changes, be sure to
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update the CAP_Start_Profiling and CAP_End_Profiling
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functions accordingly.
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--*/
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#include "basedll.h"
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#ifdef _XBOX_ENABLE_PROFILING
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#include "xprofp.h"
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//
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// Pointer to the kernel's global profiling data structure
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//
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XProfpGlobals* XapipProfileData;
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VOID XapipInitProfiling() {
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XapipProfileData = XProfpGetData();
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}
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VOID __declspec(naked) __stdcall
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_CAP_Start_Profiling(
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VOID* caller,
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VOID* callee
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)
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/*++
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Routine Description:
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Just before a function is about to be called
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Arguments:
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caller - Specifies the caller function
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callee - Specifies the called function
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Return Value:
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NONE
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Notes:
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All registers are preserved.
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--*/
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{
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/*
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ULONG* buf;
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loop:
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buf = XProfpData.bufnext
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if buf >= XProfpData.bufend, return
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Atomical incremnt XProfpData.bufnext by 4 ULONGs
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if failed, goto loop
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buf[0] = timestamp-high
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buf[1] = timestamp-low
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buf[2] = caller
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buf[3] = callee
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*/
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__asm {
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push ecx
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mov ecx, XapipProfileData
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test ecx, ecx
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jz ret2
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push eax
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push edx
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mov eax, [ecx] ; eax = XProfpData.bufnext
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loop1:
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cmp eax, [ecx+4] ; XProfpData.bufnext >= XProfpData.bufend?
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jae ret1
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lea edx, [eax+16] ; XProfpData.bufnext += 4
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cmpxchg [ecx], edx
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jnz loop1
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mov ecx, eax
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rdtsc
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mov [ecx], edx ; timestamp-high
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mov [ecx+4], eax ; timestamp-low
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mov eax, [esp+16] ; caller - 3 pushes + return address
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mov [ecx+8], eax
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mov eax, [esp+20] ; callee
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mov [ecx+12], eax
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ret1:
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pop edx
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pop eax
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ret2:
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pop ecx
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ret 8
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}
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}
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VOID __declspec(naked) __stdcall
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_CAP_End_Profiling(
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VOID* caller
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)
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/*++
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Routine Description:
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Just after a function call is made
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Arguments:
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caller - Specifies the caller function
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Return Value:
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NONE
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Notes:
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All registers are preserved.
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--*/
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{
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// Same logic as above, except the record is smaller by 1 ULONG
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__asm {
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push ecx
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mov ecx, XapipProfileData
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test ecx, ecx
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jz ret2
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push eax
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push edx
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mov eax, [ecx] ; eax = XProfpData.bufnext
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loop1:
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cmp eax, [ecx+4] ; XProfpData.bufnext >= XProfpData.bufend?
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jae ret1
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lea edx, [eax+12] ; XProfpData.bufnext += 3
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cmpxchg [ecx], edx
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jnz loop1
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mov ecx, eax
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rdtsc
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bts edx, 29 ; timestamp-high | XPROFREC_CALL_END
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mov [ecx], edx
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mov [ecx+4], eax ; timestamp-low
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mov eax, [esp+16] ; caller
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mov [ecx+8], eax
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ret1:
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pop edx
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pop eax
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ret2:
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pop ecx
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ret 4
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}
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}
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#endif // _XBOX_ENABLE_PROFILING
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