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SysCall: Restored nonvolatile registers for IA32, X64.

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This commit is contained in:
Mikhail Krichanov 2024-09-02 11:14:11 +03:00
parent 65f3047224
commit 7ad8cac11d
2 changed files with 30 additions and 13 deletions
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18
MdeModulePkg/Core/Dxe/SysCall/IA32/CoreBootServices.nasm
View File

@ -176,10 +176,14 @@ ASM_PFX(CoreBootServices):
global ASM_PFX(CallRing3)
ASM_PFX(CallRing3):
cli
; Save nonvolatile registers EBX, EBP, EDI, ESI, ESP.
push ebx
push ebp
push edi
push esi
; Save Core Stack pointers.
; Save Core Stack pointer.
mov [ASM_PFX(CoreEsp)], esp
mov [ASM_PFX(CoreEbp)], ebp
push dword [ASM_PFX(gRing3EntryPoint)]
push dword [ASM_PFX(gRing3CallStackTop)]
@ -189,7 +193,7 @@ ASM_PFX(CallRing3):
; Prepare SYSEXIT arguments.
pop ecx
pop edx
mov eax, [esp + 4] ; Data
mov eax, [esp + 4 * 5] ; Data
; Switch to User Stack.
mov ebp, ecx
@ -200,7 +204,10 @@ ASM_PFX(CallRing3):
coreReturnAddress:
mov esp, [ASM_PFX(CoreEsp)]
mov ebp, [ASM_PFX(CoreEbp)]
pop esi
pop edi
pop ebp
pop ebx
call ASM_PFX(DisableSMAP)
mov eax, [edx + 2 * 4] ; User Argument 1
@ -214,6 +221,3 @@ coreReturnAddress:
SECTION .data
ASM_PFX(CoreEsp):
resd 1
ASM_PFX(CoreEbp):
resd 1

25
MdeModulePkg/Core/Dxe/SysCall/X64/CoreBootServices.nasm
View File

@ -195,10 +195,18 @@ ASM_PFX(CallRing3):
pushfq
pop r11
cli
; Save nonvolatile registers RBX, RBP, RDI, RSI, RSP, R12, R13, R14, and R15.
push rbx
push rbp
push rdi
push rsi
push r12
push r13
push r14
push r15
; Save Core Stack pointers.
; Save Core Stack pointer.
mov [ASM_PFX(CoreRsp)], rsp
mov [ASM_PFX(CoreRbp)], rbp
; Save input Arguments.
mov r8, [ASM_PFX(gRing3CallStackTop)]
@ -220,7 +228,15 @@ o64 sysret
coreReturnAddress:
mov rsp, [ASM_PFX(CoreRsp)]
mov rbp, [ASM_PFX(CoreRbp)]
pop r15
pop r14
pop r13
pop r12
pop rsi
pop rdi
pop rbp
pop rbx
mov rax, rdx
sti
ret
@ -228,6 +244,3 @@ coreReturnAddress:
SECTION .data
ASM_PFX(CoreRsp):
resq 1
ASM_PFX(CoreRbp):
resq 1