diff options
Diffstat (limited to 'SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/Ia32/AsmFuncs.asm')
| -rw-r--r-- | SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/Ia32/AsmFuncs.asm | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/Ia32/AsmFuncs.asm b/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/Ia32/AsmFuncs.asm index 377ade7c3b..44ed6f7710 100644 --- a/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/Ia32/AsmFuncs.asm +++ b/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/Ia32/AsmFuncs.asm @@ -230,9 +230,21 @@ NoExtrPush: ;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
;; insure FXSAVE/FXRSTOR is enabled in CR4...
;; ... while we're at it, make sure DE is also enabled...
+ mov eax, 1
+ push ebx ; temporarily save value of ebx on stack
+ cpuid ; use CPUID to determine if FXSAVE/FXRESTOR and
+ ; DE are supported
+ pop ebx ; retore value of ebx that was overwritten by CPUID
mov eax, cr4
- push eax ; push cr4 firstly
- or eax, 208h
+ push eax ; push cr4 firstly
+ test edx, BIT24 ; Test for FXSAVE/FXRESTOR support
+ jz @F
+ or eax, BIT9 ; Set CR4.OSFXSR
+@@:
+ test edx, BIT2 ; Test for Debugging Extensions support
+ jz @F
+ or eax, BIT3 ; Set CR4.DE
+@@:
mov cr4, eax
mov eax, cr3
push eax
@@ -313,7 +325,12 @@ NoExtrPush: mov ecx, 128 ;= 512 / 4
rep stosd
mov edi, esp
+
+ test edx, BIT24 ; Test for FXSAVE/FXRESTOR support.
+ ; edx still contains result from CPUID above
+ jz @F
db 0fh, 0aeh, 00000111y ;fxsave [edi]
+@@:
;; save the exception data
push dword ptr [ebp + 8]
@@ -329,7 +346,12 @@ NoExtrPush: ;; FX_SAVE_STATE_IA32 FxSaveState;
mov esi, esp
+ mov eax, 1
+ cpuid ; use CPUID to determine if FXSAVE/FXRESTOR are supported
+ test edx, BIT24 ; Test for FXSAVE/FXRESTOR support
+ jz @F
db 0fh, 0aeh, 00001110y ; fxrstor [esi]
+@@:
add esp, 512
;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
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