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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
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@@ -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