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1 | #------------------------------------------------------------------------------\r |
| 2 | #\r |
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3 | # Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>\r |
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4 | # This program and the accompanying materials\r |
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5 | # are licensed and made available under the terms and conditions of the BSD License\r |
| 6 | # which accompanies this distribution. The full text of the license may be found at\r |
| 7 | # http://opensource.org/licenses/bsd-license.php\r |
| 8 | #\r |
| 9 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
| 10 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
| 11 | #\r |
| 12 | # Module Name:\r |
| 13 | #\r |
| 14 | # PageFaultHandler.S\r |
| 15 | #\r |
| 16 | # Abstract:\r |
| 17 | #\r |
| 18 | # Defines page fault handler used to hook SMM IDT\r |
| 19 | #\r |
| 20 | #------------------------------------------------------------------------------\r |
| 21 | \r |
| 22 | ASM_GLOBAL ASM_PFX(PageFaultHandlerHook)\r |
| 23 | ASM_PFX(PageFaultHandlerHook):\r |
| 24 | pushq %rax # save all volatile registers\r |
| 25 | pushq %rcx\r |
| 26 | pushq %rdx\r |
| 27 | pushq %r8\r |
| 28 | pushq %r9\r |
| 29 | pushq %r10\r |
| 30 | pushq %r11\r |
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31 | \r |
| 32 | addq $-0x68, %rsp # reserve memory to store XMM registers and make address 16-byte alignment\r |
| 33 | movdqa %xmm0, 0(%rsp) \r |
| 34 | movdqa %xmm1, 0x10(%rsp)\r |
| 35 | movdqa %xmm2, 0x20(%rsp)\r |
| 36 | movdqa %xmm3, 0x30(%rsp)\r |
| 37 | movdqa %xmm4, 0x40(%rsp)\r |
| 38 | movdqa %xmm5, 0x50(%rsp)\r |
| 39 | \r |
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40 | addq $-0x20, %rsp\r |
| 41 | call ASM_PFX(PageFaultHandler)\r |
| 42 | addq $0x20, %rsp\r |
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43 | \r |
| 44 | movdqa 0(%rsp), %xmm0\r |
| 45 | movdqa 0x10(%rsp), %xmm1\r |
| 46 | movdqa 0x20(%rsp), %xmm2\r |
| 47 | movdqa 0x30(%rsp), %xmm3\r |
| 48 | movdqa 0x40(%rsp), %xmm4\r |
| 49 | movdqa 0x50(%rsp), %xmm5\r |
| 50 | addq $0x68, %rsp\r |
| 51 | \r |
| 52 | testb %al, %al # set ZF flag\r |
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53 | popq %r11\r |
| 54 | popq %r10\r |
| 55 | popq %r9\r |
| 56 | popq %r8\r |
| 57 | popq %rdx\r |
| 58 | popq %rcx\r |
| 59 | popq %rax # restore all volatile registers\r |
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60 | jnz L1 # check ZF flag\r |
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61 | #ifdef __APPLE__\r |
| 62 | int $3\r |
| 63 | #else\r |
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64 | jmpq *ASM_PFX(mOriginalHandler)\r |
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65 | #endif\r |
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66 | L1:\r |
| 67 | addq $0x08, %rsp # skip error code for PF\r |
| 68 | iretq\r |
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