| ;; @file | |
| ; This is the assembly code for page fault handler hook. | |
| ; | |
| ; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR> | |
| ; | |
| ; SPDX-License-Identifier: BSD-2-Clause-Patent | |
| ; | |
| ;; | |
| extern ASM_PFX(PageFaultHandler) | |
| DEFAULT REL | |
| SECTION .text | |
| global ASM_PFX(PageFaultHandlerHook) | |
| ASM_PFX(PageFaultHandlerHook): | |
| add rsp, -0x10 | |
| ; save rax | |
| mov [rsp + 0x8], rax | |
| ;push rax ; save all volatile registers | |
| push rcx | |
| push rdx | |
| push r8 | |
| push r9 | |
| push r10 | |
| push r11 | |
| ; save volatile fp registers | |
| ; 68h + 08h(for alignment) | |
| add rsp, -0x70 | |
| stmxcsr [rsp + 0x60] | |
| movdqa [rsp + 0x0], xmm0 | |
| movdqa [rsp + 0x10], xmm1 | |
| movdqa [rsp + 0x20], xmm2 | |
| movdqa [rsp + 0x30], xmm3 | |
| movdqa [rsp + 0x40], xmm4 | |
| movdqa [rsp + 0x50], xmm5 | |
| add rsp, -0x20 | |
| call ASM_PFX(PageFaultHandler) | |
| add rsp, 0x20 | |
| ; load volatile fp registers | |
| ldmxcsr [rsp + 0x60] | |
| movdqa xmm0, [rsp + 0x0] | |
| movdqa xmm1, [rsp + 0x10] | |
| movdqa xmm2, [rsp + 0x20] | |
| movdqa xmm3, [rsp + 0x30] | |
| movdqa xmm4, [rsp + 0x40] | |
| movdqa xmm5, [rsp + 0x50] | |
| add rsp, 0x70 | |
| pop r11 | |
| pop r10 | |
| pop r9 | |
| pop r8 | |
| pop rdx | |
| pop rcx | |
| ;pop rax ; restore all volatile registers | |
| add rsp, 0x10 | |
| ; rax returned from PageFaultHandler is NULL or OriginalHandler address | |
| ; NULL if the page fault is handled by PageFaultHandler | |
| ; OriginalHandler address if the page fault is not handled by PageFaultHandler | |
| test rax, rax | |
| ; save OriginalHandler address | |
| mov [rsp - 0x10], rax | |
| ; restore rax | |
| mov rax, [rsp - 0x8] | |
| jz .0 | |
| ; jump to OriginalHandler | |
| jmp qword [rsp - 0x10] | |
| .0: | |
| add rsp, 0x8 ; skip error code for PF | |
| iretq | |