diff options
Diffstat (limited to 'UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm')
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm | 47 |
1 files changed, 15 insertions, 32 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm index 4d53db5b00..4f5c03c5cf 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm @@ -22,12 +22,13 @@ ; Variables referenced by C code
;
EXTERNDEF SmiRendezvous:PROC
+EXTERNDEF CpuSmmDebugEntry:PROC
+EXTERNDEF CpuSmmDebugExit:PROC
EXTERNDEF gcSmiHandlerTemplate:BYTE
EXTERNDEF gcSmiHandlerSize:WORD
EXTERNDEF gSmiCr3:DWORD
EXTERNDEF gSmiStack:DWORD
EXTERNDEF gSmbase:DWORD
-EXTERNDEF FeaturePcdGet (PcdCpuSmmDebug):BYTE
EXTERNDEF gSmiHandlerIdtr:FWORD
@@ -157,26 +158,7 @@ Base: ; jmp _SmiHandler ; instruction is not needed
_SmiHandler:
-;
-; The following lines restore DR6 & DR7 before running C code. They are useful
-; when you want to enable hardware breakpoints in SMM.
-;
-; NOTE: These lines might not be appreciated in runtime since they might
-; conflict with OS debugging facilities. Turn them off in RELEASE.
-;
- mov rax, offset FeaturePcdGet (PcdCpuSmmDebug) ;Get absolute address. Avoid RIP relative addressing
- cmp byte ptr [rax], 0
- jz @1
-
- DB 48h, 8bh, 0dh ; mov rcx, [rip + disp32]
- DD SSM_DR6 - ($ + 4 - _SmiEntryPoint + 8000h)
- DB 48h, 8bh, 15h ; mov rdx, [rip + disp32]
- DD SSM_DR7 - ($ + 4 - _SmiEntryPoint + 8000h)
- mov dr6, rcx
- mov dr7, rdx
-@1:
- mov rcx, [rsp] ; rcx <- CpuIndex
- mov rax, SmiRendezvous ; rax <- absolute addr of SmiRedezvous
+ mov rbx, [rsp] ; rbx <- CpuIndex
;
; Save FP registers
@@ -186,7 +168,19 @@ _SmiHandler: fxsave [rsp]
add rsp, -20h
+
+ mov rcx, rbx
+ mov rax, CpuSmmDebugEntry
+ call rax
+
+ mov rcx, rbx
+ mov rax, SmiRendezvous ; rax <- absolute addr of SmiRedezvous
+ call rax
+
+ mov rcx, rbx
+ mov rax, CpuSmmDebugExit
call rax
+
add rsp, 20h
;
@@ -195,17 +189,6 @@ _SmiHandler: DB 48h ; FXRSTOR64
fxrstor [rsp]
- mov rax, offset FeaturePcdGet (PcdCpuSmmDebug) ;Get absolute address. Avoid RIP relative addressing
- cmp byte ptr [rax], 0
- jz @2
-
- mov rdx, dr7
- mov rcx, dr6
- DB 48h, 89h, 15h ; mov [rip + disp32], rdx
- DD SSM_DR7 - ($ + 4 - _SmiEntryPoint + 8000h)
- DB 48h, 89h, 0dh ; mov [rip + disp32], rcx
- DD SSM_DR6 - ($ + 4 - _SmiEntryPoint + 8000h)
-@2:
rsm
gcSmiHandlerSize DW $ - _SmiEntryPoint
|