projects / mirror_edk2.git / blame
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|---|---|---|
| 3763cfc1 JJ |
1 | ;; @file\r |
| 2 | ; This is the assembly code for page fault handler hook.\r | |
| 3 | ;\r | |
| 4 | ; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r | |
| 5 | ;\r | |
| 6 | ; This program and the accompanying materials\r | |
| 7 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
| 8 | ; which accompanies this distribution. The full text of the license may be found at\r | |
| 9 | ; http://opensource.org/licenses/bsd-license.php\r | |
| 10 | ;\r | |
| 11 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 12 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 13 | ;\r | |
| 14 | ;;\r | |
| 15 | \r | |
| 16 | extern ASM_PFX(PageFaultHandler)\r | |
| 17 | \r | |
| 18 | DEFAULT REL\r | |
| 19 | SECTION .text\r | |
| 20 | \r | |
| 21 | global ASM_PFX(PageFaultHandlerHook)\r | |
| 22 | ASM_PFX(PageFaultHandlerHook):\r | |
| 23 | add rsp, -0x10\r | |
| 24 | ; save rax\r | |
| 25 | mov [rsp + 0x8], rax\r | |
| 26 | \r | |
| 27 | ;push rax ; save all volatile registers\r | |
| 28 | push rcx\r | |
| 29 | push rdx\r | |
| 30 | push r8\r | |
| 31 | push r9\r | |
| 32 | push r10\r | |
| 33 | push r11\r | |
| 34 | ; save volatile fp registers\r | |
| 35 | ; 68h + 08h(for alignment)\r | |
| 36 | add rsp, -0x70\r | |
| 37 | stmxcsr [rsp + 0x60]\r | |
| 38 | movdqa [rsp + 0x0], xmm0\r | |
| 39 | movdqa [rsp + 0x10], xmm1\r | |
| 40 | movdqa [rsp + 0x20], xmm2\r | |
| 41 | movdqa [rsp + 0x30], xmm3\r | |
| 42 | movdqa [rsp + 0x40], xmm4\r | |
| 43 | movdqa [rsp + 0x50], xmm5\r | |
| 44 | \r | |
| 45 | add rsp, -0x20\r | |
| 46 | call ASM_PFX(PageFaultHandler)\r | |
| 47 | add rsp, 0x20\r | |
| 48 | \r | |
| 49 | ; load volatile fp registers\r | |
| 50 | ldmxcsr [rsp + 0x60]\r | |
| 51 | movdqa xmm0, [rsp + 0x0]\r | |
| 52 | movdqa xmm1, [rsp + 0x10]\r | |
| 53 | movdqa xmm2, [rsp + 0x20]\r | |
| 54 | movdqa xmm3, [rsp + 0x30]\r | |
| 55 | movdqa xmm4, [rsp + 0x40]\r | |
| 56 | movdqa xmm5, [rsp + 0x50]\r | |
| 57 | add rsp, 0x70\r | |
| 58 | \r | |
| 59 | pop r11\r | |
| 60 | pop r10\r | |
| 61 | pop r9\r | |
| 62 | pop r8\r | |
| 63 | pop rdx\r | |
| 64 | pop rcx\r | |
| 65 | ;pop rax ; restore all volatile registers\r | |
| 66 | \r | |
| 67 | add rsp, 0x10\r | |
| 68 | \r | |
| 69 | ; rax returned from PageFaultHandler is NULL or OriginalHandler address\r | |
| 70 | ; NULL if the page fault is handled by PageFaultHandler\r | |
| 71 | ; OriginalHandler address if the page fault is not handled by PageFaultHandler\r | |
| 72 | test rax, rax\r | |
| 73 | \r | |
| 74 | ; save OriginalHandler address\r | |
| 75 | mov [rsp - 0x10], rax\r | |
| 76 | ; restore rax\r | |
| 77 | mov rax, [rsp - 0x8]\r | |
| 78 | \r | |
| 79 | jz .0\r | |
| 80 | \r | |
| 81 | ; jump to OriginalHandler\r | |
| 82 | jmp qword [rsp - 0x10]\r | |
| 83 | \r | |
| 84 | .0:\r | |
| 85 | add rsp, 0x8 ; skip error code for PF\r | |
| 86 | iretq\r | |
| 87 | \r |