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SysCall: Some refactoring.

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This commit is contained in:
Mikhail Krichanov 2024-03-26 15:50:46 +03:00
parent 279c5338bc
commit 149fb5719b
1 changed files with 15 additions and 12 deletions
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27
MdeModulePkg/Core/Dxe/SysCall/X64/CoreBootServices.nasm
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@ -12,8 +12,6 @@ extern ASM_PFX(gCoreSysCallStackTop)
extern ASM_PFX(gRing3CallStackTop)
extern ASM_PFX(gRing3EntryPoint)
extern ASM_PFX(AsmReadMsr64)
DEFAULT REL
SECTION .text
@ -79,9 +77,8 @@ ASM_PFX(CallInstallMultipleProtocolInterfaces):
copy:
sub rax, 8
push qword [rax]
cmp r10, 0
sub r10, 1
jne copy
jnz copy
push rcx
call r11
@ -96,7 +93,9 @@ copy:
%macro SetRing3DataSegmentSelectors 0
mov rcx, MSR_IA32_STAR
call ASM_PFX(AsmReadMsr64)
rdmsr
shl rdx, 0x20
or rax, rdx
; rax = ((RING3_CODE64_SEL - 16) << 16 | RING0_CODE64_SEL) << 32
shr rax, 48
add rax, 8
@ -197,19 +196,23 @@ ASM_PFX(CallRing3):
pop r11
cli
; Save Core Stack pointers.
mov [ASM_PFX(CoreRsp)], rsp
mov [ASM_PFX(CoreRbp)], rbp
; Save input Arguments.
push rcx
mov r8, [ASM_PFX(gRing3CallStackTop)]
mov r9, [ASM_PFX(gRing3EntryPoint)]
mov r10, rcx
SetRing3DataSegmentSelectors
; Prepare SYSRET arguments.
mov rcx, [ASM_PFX(gRing3EntryPoint)]
pop rdx
mov rdx, r10
mov rcx, r9
; Save Core Stack pointers and switch to User Stack.
mov [ASM_PFX(CoreRsp)], rsp
mov [ASM_PFX(CoreRbp)], rbp
mov rsp, [ASM_PFX(gRing3CallStackTop)]
; Switch to User Stack.
mov rsp, r8
mov rbp, rsp
; Pass control to user image