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Move SmmDebug feature from ASM to C.

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SmmDebug feature is implemented in ASM, which is not easy to maintain.
So we move it to C function.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Kinney, Michael D" <michael.d.kinney@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18946 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Yao, Jiewen
2015-11-25 08:51:15 +00:00
committed by jyao1
parent 0b256fb1dd
commit f45f2d4ad4
5 changed files with 113 additions and 122 deletions
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39
UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.S
View File

@@ -24,7 +24,6 @@ ASM_GLOBAL ASM_PFX(gcSmiHandlerSize)
ASM_GLOBAL ASM_PFX(gSmiCr3)
ASM_GLOBAL ASM_PFX(gSmiStack)
ASM_GLOBAL ASM_PFX(gSmbase)
ASM_GLOBAL ASM_PFX(FeaturePcdGet (PcdCpuSmmDebug))
ASM_GLOBAL ASM_PFX(gSmiHandlerIdtr)
#
@@ -163,20 +162,7 @@ LongMode: # long mode (64-bit code) starts here
# jmp _SmiHandler ; instruction is not needed
_SmiHandler:
movabsq $ASM_PFX(FeaturePcdGet (PcdCpuSmmDebug)), %rax
cmpb $0, (%rax)
jz L1
.byte 0x48, 0x8b, 0x0d # mov rcx, [rip + disp32]
.long SSM_DR6 - (. + 4 - _SmiEntryPoint + 0x8000)
.byte 0x48, 0x8b, 0x15 # mov rdx, [rip + disp32]
.long SSM_DR7 - (. + 4 - _SmiEntryPoint + 0x8000)
movq %rcx, %dr6
movq %rdx, %dr7
L1:
movabsq $ASM_PFX(SmiRendezvous), %rax
movq (%rsp), %rcx
movq (%rsp), %rbx
# Save FP registers
subq $0x208, %rsp
@@ -184,7 +170,19 @@ L1:
fxsave (%rsp)
addq $-0x20, %rsp
movq %rbx, %rcx
movabsq $ASM_PFX(CpuSmmDebugEntry), %rax
call *%rax
movq %rbx, %rcx
movabsq $ASM_PFX(SmiRendezvous), %rax
call *%rax
movq %rbx, %rcx
movabsq $ASM_PFX(CpuSmmDebugExit), %rax
call *%rax
addq $0x20, %rsp
#
@@ -193,17 +191,6 @@ L1:
.byte 0x48 # FXRSTOR64
fxrstor (%rsp)
movabsq $ASM_PFX(FeaturePcdGet (PcdCpuSmmDebug)), %rax
cmpb $0, (%rax)
jz L2
movq %dr7, %rdx
movq %dr6, %rcx
.byte 0x48, 0x89, 0x15 # mov [rip + disp32], rdx
.long SSM_DR7 - (. + 4 - _SmiEntryPoint + 0x8000)
.byte 0x48, 0x89, 0x0d # mov [rip + disp32], rcx
.long SSM_DR6 - (. + 4 - _SmiEntryPoint + 0x8000)
L2:
rsm
ASM_PFX(gcSmiHandlerSize): .word . - _SmiEntryPoint

47
UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
View File

@@ -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