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Ring3: Added SysCallReturnToCore.

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This commit is contained in:
Mikhail Krichanov 2024-02-09 16:09:45 +03:00
parent e5f7eb7654
commit a72b753f60
3 changed files with 11 additions and 2 deletions
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6
MdeModulePkg/Core/Dxe/SysCall/X64/CoreBootServices.nasm
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@ -123,6 +123,10 @@ ASM_PFX(CoreBootServices):
mov fs, ax mov fs, ax
mov gs, ax mov gs, ax
; Special case for SysCallReturnToCore.
cmp r10, 0
je coreReturnAddress
; Save User Stack pointers and switch to Core SysCall Stack. ; Save User Stack pointers and switch to Core SysCall Stack.
mov rax, [ASM_PFX(gCoreSysCallStackTop)] mov rax, [ASM_PFX(gCoreSysCallStackTop)]
sub rax, 8 sub rax, 8
@ -229,6 +233,8 @@ ASM_PFX(CallRing3):
o64 sysret o64 sysret
coreReturnAddress: coreReturnAddress:
mov rsp, [ASM_PFX(CoreRsp)]
mov rbp, [ASM_PFX(CoreRbp)]
ret ret
SECTION .data SECTION .data

4
MdeModulePkg/Core/Dxe/SysCall/X64/Ring3Dxe.nasm
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@ -29,4 +29,6 @@ ASM_PFX(_ModuleEntryPoint):
call r8 call r8
ret mov r10, 0
syscall

1
MdePkg/Include/Uefi/UefiSpec.h
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@ -2014,6 +2014,7 @@ typedef struct {
} EFI_BOOT_SERVICES; } EFI_BOOT_SERVICES;
typedef enum { typedef enum {
SysCallReturnToCore = 0,
SysCallLocateProtocol = 1, SysCallLocateProtocol = 1,
SysCallOpenProtocol = 2, SysCallOpenProtocol = 2,
SysCallInstallMultipleProtocolInterfaces = 3, SysCallInstallMultipleProtocolInterfaces = 3,