From 43a99f081e9af6aef9c24d35540f1299441b2970 Mon Sep 17 00:00:00 2001 From: vanjeff Date: Mon, 15 Dec 2008 10:05:10 +0000 Subject: [PATCH] Port AsmFuncs.s to pass CYGWINGCC build for x64. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7033 6f19259b-4bc3-4df7-8a09-765794883524 --- .../DebugSupportDxe/Ia32/PlDebugSupport.c | 1 - .../DebugSupportDxe/Ia32/PlDebugSupportIa32.c | 2 + .../Universal/DebugSupportDxe/X64/AsmFuncs.S | 560 +++++++++++++++++- .../DebugSupportDxe/X64/PlDebugSupportX64.c | 2 + 4 files changed, 535 insertions(+), 30 deletions(-) diff --git a/MdeModulePkg/Universal/DebugSupportDxe/Ia32/PlDebugSupport.c b/MdeModulePkg/Universal/DebugSupportDxe/Ia32/PlDebugSupport.c index 24e2cd0700..3c96f9b518 100644 --- a/MdeModulePkg/Universal/DebugSupportDxe/Ia32/PlDebugSupport.c +++ b/MdeModulePkg/Universal/DebugSupportDxe/Ia32/PlDebugSupport.c @@ -18,7 +18,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. // This the global main table to keep track of the interrupts // IDT_ENTRY *IdtEntryTable = NULL; -IA32_IDT_GATE_DESCRIPTOR NullDesc = {0}; /** Read IDT Gate Descriptor from IDT Table. diff --git a/MdeModulePkg/Universal/DebugSupportDxe/Ia32/PlDebugSupportIa32.c b/MdeModulePkg/Universal/DebugSupportDxe/Ia32/PlDebugSupportIa32.c index ff21ed7f2a..c75c040152 100644 --- a/MdeModulePkg/Universal/DebugSupportDxe/Ia32/PlDebugSupportIa32.c +++ b/MdeModulePkg/Universal/DebugSupportDxe/Ia32/PlDebugSupportIa32.c @@ -14,6 +14,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. #include "DebugSupport.h" +IA32_IDT_GATE_DESCRIPTOR NullDesc = {{0}}; + /** Get Interrupt Handle from IDT Gate Descriptor. diff --git a/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S b/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S index 693d26e6e4..864b6e4112 100644 --- a/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S +++ b/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S @@ -1,7 +1,7 @@ #/**@file # Low leve x64 specific debug support functions. # -# Copyright (c) 2006, Intel Corporation +# Copyright (c) 2006 - 2008, Intel Corporation # All rights reserved. This program and the accompanying materials # are licensed and made available under the terms and conditions of the BSD License # which accompanies this distribution. The full text of the license may be found at @@ -10,41 +10,543 @@ # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. # -#**/ +#**/ -.globl _OrigVector -.globl _InterruptEntryStub -.globl _StubSize -.globl _CommonIdtEntry -.globl _FxStorSupport +.intel_syntax noprefix -_AppEsp: .long 0x11111111 # ? -_DebugEsp: .long 0x22222222 # ? -_ExtraPush: .long 0x33333333 # ? -_ExceptData: .long 0x44444444 # ? -_Eflags: .long 0x55555555 # ? -_OrigVector: .long 0x66666666 # ? -_StubSize: .long _InterruptEntryStubEnd - _InterruptEntryStub -.globl _FxStorSupport -_FxStorSupport: - ret +.globl ASM_PFX(OrigVector) +.globl ASM_PFX(InterruptEntryStub) +.globl ASM_PFX(StubSize) +.globl ASM_PFX(CommonIdtEntry) +.globl ASM_PFX(FxStorSupport) + +.data -.globl _Vect2Desc -_Vect2Desc: - ret +ASM_PFX(StubSize): .long ASM_PFX(InterruptEntryStubEnd) - ASM_PFX(InterruptEntryStub) +ASM_PFX(AppRsp): .long 0x11111111 # ? + .long 0x11111111 # ? +ASM_PFX(DebugRsp): .long 0x22222222 # ? + .long 0x22222222 # ? +ASM_PFX(ExtraPush): .long 0x33333333 # ? + .long 0x33333333 # ? +ASM_PFX(ExceptData): .long 0x44444444 # ? + .long 0x44444444 # ? +ASM_PFX(Rflags): .long 0x55555555 # ? + .long 0x55555555 # ? +ASM_PFX(OrigVector): .long 0x66666666 # ? + .long 0x66666666 # ? -.globl _InterruptEntryStub -_InterruptEntryStub: - ret +## The declarations below define the memory region that will be used for the debug stack. +## The context record will be built by pushing register values onto this stack. +## It is imparitive that alignment be carefully managed, since the FXSTOR and +## FXRSTOR instructions will GP fault if their memory operand is not 16 byte aligned. +## +## The stub will switch stacks from the application stack to the debuger stack +## and pushes the exception number. +## +## Then we building the context record on the stack. Since the stack grows down, +## we push the fields of the context record from the back to the front. There +## are 336 bytes of stack used prior allocating the 512 bytes of stack to be +## used as the memory buffer for the fxstor instruction. Therefore address of +## the buffer used for the FXSTOR instruction is &Eax - 336 - 512, which +## must be 16 byte aligned. +## +## We carefully locate the stack to make this happen. +## +## For reference, the context structure looks like this: +## struct { +## UINT64 ExceptionData; +## FX_SAVE_STATE_X64 FxSaveState; // 512 bytes, must be 16 byte aligned +## UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7; +## UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8; +## UINT64 RFlags; +## UINT64 Ldtr, Tr; +## UINT64 Gdtr[2], Idtr[2]; +## UINT64 Rip; +## UINT64 Gs, Fs, Es, Ds, Cs, Ss; +## UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax; +## UINT64 R8, R9, R10, R11, R12, R13, R14, R15; +## } SYSTEM_CONTEXT_X64; // 64 bit system context record + +.align 16 +DebugStackEnd : .ascii "DbgStkEnd >>>>>>" # 16 byte long string - must be 16 bytes to preserve alignment + .rept 0x1ffc + .long 0x00000000 + .endr + # 32K should be enough stack + # This allocation is coocked to insure + # that the the buffer for the FXSTORE instruction + # will be 16 byte aligned also. + # +ASM_PFX(ExceptionNumber): .long 0x77777777 # first entry will be the vector number pushed by the stub + .long 0x77777777 # ? + +DebugStackBegin : .ascii "<<<< DbgStkBegin" # initial debug ESP == DebugStackBegin, set in stub + + +.text + +#------------------------------------------------------------------------------ +# BOOLEAN +# FxStorSupport ( +# void +# ) +# +# Abstract: Returns TRUE if FxStor instructions are supported +# +.globl ASM_PFX(FxStorSupport) +ASM_PFX(FxStorSupport): +# +# cpuid corrupts rbx which must be preserved per the C calling convention +# + push rbx + mov rax, 1 + cpuid + mov eax, edx + and rax, 0x01000000 + shr rax, 24 + pop rbx + ret +#------------------------------------------------------------------------------ +# void +# Vect2Desc ( +# IA32_IDT_GATE_DESCRIPTOR * DestDesc, // rcx +# void (*Vector) (void) // rdx +# ) +# +# Abstract: Encodes an IDT descriptor with the given physical address +# +.globl ASM_PFX(Vect2Desc) +ASM_PFX(Vect2Desc): + mov rax, rdx + mov word ptr [rcx], ax # write bits 15..0 of offset + mov dx, cs + mov word ptr [rcx+2], dx # SYS_CODE_SEL from GDT + mov word ptr [rcx+4], 0x0e00 OR 0x8000 # type = 386 interrupt gate, present + shr rax, 16 + mov word ptr [rcx+6], ax # write bits 31..16 of offset + shr rax, 16 + mov dword ptr [rcx+8], eax # write bits 63..32 of offset + + ret + +#------------------------------------------------------------------------------ +# InterruptEntryStub +# +# Abstract: This code is not a function, but is a small piece of code that is +# copied and fixed up once for each IDT entry that is hooked. +# +.globl ASM_PFX(InterruptEntryStub) +ASM_PFX(InterruptEntryStub): + + push 0 # push vector number - will be modified before installed + jmp ASM_PFX(CommonIdtEntry) + +.globl ASM_PFX(InterruptEntryStubEnd) +ASM_PFX(InterruptEntryStubEnd): -.globl _InterruptEntryStubEnd -_InterruptEntryStubEnd: ret -.globl _CommonIdtEntry -_CommonIdtEntry: +#------------------------------------------------------------------------------ +# CommonIdtEntry +# +# Abstract: This code is not a function, but is the common part for all IDT +# vectors. +# +.globl ASM_PFX(CommonIdtEntry) +## +## At this point, the stub has saved the current application stack esp into AppRsp +## and switched stacks to the debug stack, where it pushed the vector number +## +## The application stack looks like this: +## +## ... +## (last application stack entry) +## [16 bytes alignment, do not care it] +## SS from interrupted task +## RSP from interrupted task +## rflags from interrupted task +## CS from interrupted task +## RIP from interrupted task +## Error code <-------------------- Only present for some exeption types +## +## Vector Number <----------------- pushed in our IDT Entry +## + + +## The stub switched us to the debug stack and pushed the interrupt number. +## +## Next, construct the context record. It will be build on the debug stack by +## pushing the registers in the correct order so as to create the context structure +## on the debug stack. The context record must be built from the end back to the +## beginning because the stack grows down... +# +## For reference, the context record looks like this: +## +## typedef +## struct { +## UINT64 ExceptionData; +## FX_SAVE_STATE_X64 FxSaveState; +## UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7; +## UINT64 Cr0, Cr2, Cr3, Cr4, Cr8; +## UINT64 RFlags; +## UINT64 Ldtr, Tr; +## UINT64 Gdtr[2], Idtr[2]; +## UINT64 Rip; +## UINT64 Gs, Fs, Es, Ds, Cs, Ss; +## UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax; +## UINT64 R8, R9, R10, R11, R12, R13, R14, R15; +## } SYSTEM_CONTEXT_X64; // 64 +ASM_PFX(CommonIdtEntry): + ret -PhonyIretd: - iret +## NOTE: we save rsp here to prevent compiler put rip reference cause error AppRsp + push rax + mov rax, qword ptr [rsp][8] # save vector number + mov ASM_PFX(ExceptionNumber), rax # save vector number + pop rax + add rsp, 8 # pop vector number + mov ASM_PFX(AppRsp), rsp # save stack top + mov rsp, offset DebugStackBegin # switch to debugger stack + sub rsp, 8 # leave space for vector number +## UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax; +## UINT64 R8, R9, R10, R11, R12, R13, R14, R15; + push r15 + push r14 + push r13 + push r12 + push r11 + push r10 + push r9 + push r8 + push rax + push rcx + push rdx + push rbx + push rsp + push rbp + push rsi + push rdi +## Save interrupt state rflags register... + pushfq + pop rax + mov qword ptr ASM_PFX(Rflags), rax +## We need to determine if any extra data was pushed by the exception, and if so, save it +## To do this, we check the exception number pushed by the stub, and cache the +## result in a variable since we'll need this again. + cmp dword ptr ASM_PFX(ExceptionNumber), 0 + jz ExtraPushOne + cmp dword ptr ASM_PFX(ExceptionNumber), 10 + jz ExtraPushOne + cmp dword ptr ASM_PFX(ExceptionNumber), 11 + jz ExtraPushOne + cmp dword ptr ASM_PFX(ExceptionNumber), 12 + jz ExtraPushOne + cmp dword ptr ASM_PFX(ExceptionNumber), 13 + jz ExtraPushOne + cmp dword ptr ASM_PFX(ExceptionNumber), 14 + jz ExtraPushOne + cmp dword ptr ASM_PFX(ExceptionNumber), 17 + jz ExtraPushOne + mov dword ptr ASM_PFX(ExtraPush), 0 + mov dword ptr ASM_PFX(ExceptData), 0 + jmp ExtraPushDone +ExtraPushOne: + mov dword ptr ASM_PFX(ExtraPush), 1 + +## If there's some extra data, save it also, and modify the saved AppRsp to effectively +## pop this value off the application's stack. + mov rax, ASM_PFX(AppRsp) + mov rbx, [rax] + mov ASM_PFX(ExceptData), rbx + add rax, 8 + mov ASM_PFX(AppRsp), rax + +ExtraPushDone: + +## The "push" above pushed the debug stack rsp. Since what we're actually doing +## is building the context record on the debug stack, we need to save the pushed +## debug RSP, and replace it with the application's last stack entry... + mov rax, [rsp + 24] + mov ASM_PFX(DebugRsp), rax + mov rax, ASM_PFX(AppRsp) + add rax, 40 + # application stack has ss, rsp, rflags, cs, & rip, so + # last actual application stack entry is + # 40 bytes into the application stack. + mov [rsp + 24], rax +## continue building context record +## UINT64 Gs, Fs, Es, Ds, Cs, Ss; insure high 16 bits of each is zero + mov rax, ss + push rax + # CS from application is one entry back in application stack + mov rax, ASM_PFX(AppRsp) + movzx rax, word ptr [rax + 8] + push rax + + mov rax, ds + push rax + mov rax, es + push rax + mov rax, fs + push rax + mov rax, gs + push rax +## UINT64 Rip; + # Rip from application is on top of application stack + mov rax, ASM_PFX(AppRsp) + push qword ptr [rax] +## UINT64 Gdtr[2], Idtr[2]; + push 0 + push 0 + sidt qword ptr [rsp] + push 0 + push 0 + sgdt qword ptr [rsp] + +## UINT64 Ldtr, Tr; + xor rax, rax + str ax + push rax + sldt ax + push rax + +## UINT64 RFlags; +## Rflags from application is two entries back in application stack + mov rax, ASM_PFX(AppRsp) + push qword ptr [rax + 16] +## UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8; +## insure FXSAVE/FXRSTOR is enabled in CR4... +## ... while we're at it, make sure DE is also enabled... + mov rax, cr8 + push rax + mov rax, cr4 + or rax, 0x208 + mov cr4, rax + push rax + mov rax, cr3 + push rax + mov rax, cr2 + push rax + push 0 + mov rax, cr0 + push rax +## UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7; + mov rax, dr7 + push rax +## clear Dr7 while executing debugger itself + xor rax, rax + mov dr7, rax + + mov rax, dr6 + push rax +## insure all status bits in dr6 are clear... + xor rax, rax + mov dr6, rax + + mov rax, dr3 + push rax + mov rax, dr2 + push rax + mov rax, dr1 + push rax + mov rax, dr0 + push rax + +## FX_SAVE_STATE_X64 FxSaveState; + sub rsp, 512 + mov rdi, rsp + # IMPORTANT!! The debug stack has been carefully constructed to + # insure that rsp and rdi are 16 byte aligned when we get here. + # They MUST be. If they are not, a GP fault will occur. + # FXSTOR_RDI + .byte 0x0f + .byte 0xae + .byte 0x07 + +## UINT64 ExceptionData; + mov rax, ASM_PFX(ExceptData) + push rax +# call to C code which will in turn call registered handler +# pass in the vector number + mov rdx, rsp + mov rcx, ASM_PFX(ExceptionNumber) + sub rsp, 40 + call ASM_PFX(InterruptDistrubutionHub) + add rsp, 40 +# restore context... +## UINT64 ExceptionData; + add rsp, 8 +## FX_SAVE_STATE_X64 FxSaveState; + mov rsi, rsp + # FXRSTOR_RSI + .byte 0x0f + .byte 0xae + .byte 0x0e + add rsp, 512 +;; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7; + pop rax + mov dr0, rax + pop rax + mov dr1, rax + pop rax + mov dr2, rax + pop rax + mov dr3, rax +## skip restore of dr6. We cleared dr6 during the context save. + add rsp, 8 + pop rax + mov dr7, rax +## UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8; + pop rax + mov cr0, rax + add rsp, 8 + pop rax + mov cr2, rax + pop rax + mov cr3, rax + pop rax + mov cr4, rax + pop rax + mov cr8, rax +## UINT64 RFlags; + mov rax, ASM_PFX(AppRsp) + pop qword ptr [rax + 16] +## UINT64 Ldtr, Tr; +## UINT64 Gdtr[2], Idtr[2]; +## Best not let anyone mess with these particular registers... + add rsp, 48 +## UINT64 Rip; + pop qword ptr [rax] + +## UINT64 Gs, Fs, Es, Ds, Cs, Ss; +## NOTE - modified segment registers could hang the debugger... We +## could attempt to insulate ourselves against this possibility, +## but that poses risks as well. +## + + pop rax + # mov gs, rax + pop rax + # mov fs, rax + pop rax + mov es, rax + pop rax + mov ds, rax + mov rax, ASM_PFX(AppRsp) + pop qword ptr [rax + 8] + pop rax + mov ss, rax +## The next stuff to restore is the general purpose registers that were pushed +## using the "push" instruction. +## +## The value of RSP as stored in the context record is the application RSP +## including the 5 entries on the application stack caused by the exception +## itself. It may have been modified by the debug agent, so we need to +## determine if we need to relocate the application stack. + + mov rbx, [rsp + 24] # move the potentially modified AppRsp into rbx + mov rax, ASM_PFX(AppRsp) + add rax, 40 + cmp rbx, rax + je NoAppStackMove + + mov rax, ASM_PFX(AppRsp) + mov rcx, [rax] # RIP + mov [rbx], rcx + + mov rcx, [rax + 8] # CS + mov [rbx + 8], rcx + + mov rcx, [rax + 16] # RFLAGS + mov [rbx + 16], rcx + + mov rcx, [rax + 24] # RSP + mov [rbx + 24], rcx + + mov rcx, [rax + 32] # SS + mov [rbx + 32], rcx + + mov rax, rbx # modify the saved AppRsp to the new AppRsp + mov ASM_PFX(AppRsp), rax +NoAppStackMove: + mov rax, ASM_PFX(DebugRsp) # restore the DebugRsp on the debug stack + # so our "pop" will not cause a stack switch + mov [rsp + 24], rax + + cmp dword ptr ASM_PFX(ExceptionNumber), 0x068 + jne NoChain + +Chain: + +## Restore rflags so when we chain, the flags will be exactly as if we were never here. +## We gin up the stack to do an iretq so we can get ALL the flags. + mov rax, ASM_PFX(AppRsp) + mov rbx, [rax + 40] + push rbx + mov rax, ss + push rax + mov rax, rsp + add rax, 16 + push rax + mov rax, ASM_PFX(AppRsp) + mov rbx, [rax + 16] + and rbx, NOT 0x300 # special handling for IF and TF + push rbx + mov rax, cs + push rax + mov rax, offset PhonyIretq + push rax + iretq +PhonyIretq: + +## UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax; +## UINT64 R8, R9, R10, R11, R12, R13, R14, R15; + pop rdi + pop rsi + pop rbp + pop rsp + pop rbx + pop rdx + pop rcx + pop rax + pop r8 + pop r9 + pop r10 + pop r11 + pop r12 + pop r13 + pop r14 + pop r15 + +## Switch back to application stack + mov rsp, ASM_PFX(AppRsp) +## Jump to original handler + jmp ASM_PFX(OrigVector) +NoChain: +## UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax; +## UINT64 R8, R9, R10, R11, R12, R13, R14, R15; + pop rdi + pop rsi + pop rbp + pop rsp + pop rbx + pop rdx + pop rcx + pop rax + pop r8 + pop r9 + pop r10 + pop r11 + pop r12 + pop r13 + pop r14 + pop r15 + +## Switch back to application stack + mov rsp, ASM_PFX(AppRsp) + +## We're outa here... + iret diff --git a/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c b/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c index e898d82271..d6173bb12f 100644 --- a/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c +++ b/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c @@ -14,6 +14,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. #include "DebugSupport.h" +IA32_IDT_GATE_DESCRIPTOR NullDesc = {{0,0}}; + /** Get Interrupt Handle from IDT Gate Descriptor. -- 2.39.2