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1 | #------------------------------------------------------------------------------\r |
| 2 | #\r |
| 3 | # Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r |
| 4 | # This program and the accompanying materials\r |
| 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 | # SwitchStack.S\r |
| 15 | #\r |
| 16 | # Abstract:\r |
| 17 | #\r |
| 18 | #------------------------------------------------------------------------------\r |
| 19 | \r |
| 20 | \r |
| 21 | #------------------------------------------------------------------------------\r |
| 22 | # Routine Description:\r |
| 23 | #\r |
| 24 | # Routine for switching stacks with 3 parameters EFI ABI\r |
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25 | # Convert UNIX to EFI ABI\r |
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26 | #\r |
| 27 | # Arguments:\r |
| 28 | #\r |
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29 | # (rdi) EntryPoint - Entry point with new stack.\r |
| 30 | # (rsi) Context1 - Parameter1 for entry point. (rcx)\r |
| 31 | # (rdx) Context2 - Parameter2 for entry point. (rdx) \r |
| 32 | # (rcx) Context3 - Parameter3 for entry point. (r8)\r |
| 33 | # (r8) NewStack - The pointer to new stack.\r |
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34 | #\r |
| 35 | # Returns:\r |
| 36 | #\r |
| 37 | # None\r |
| 38 | #\r |
| 39 | #------------------------------------------------------------------------------\r |
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40 | ASM_GLOBAL ASM_PFX(GasketPeiSwitchStacks)\r |
| 41 | ASM_PFX(GasketPeiSwitchStacks):\r |
| 42 | // movq %rdx, %rdx \r |
| 43 | movq %r8, %rsp\r |
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44 | \r |
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45 | movq %rdi, %rax\r |
| 46 | movq %rsi, %rcx\r |
| 47 | movq %rcx, %r8 \r |
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48 | \r |
| 49 | #\r |
| 50 | # Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,\r |
| 51 | # in case the callee wishes to spill them.\r |
| 52 | #\r |
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53 | subq 40, %rsp // 32-byte shadow space plus alignment pad\r |
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54 | call *%rax\r |
| 55 | \r |
| 56 | \r |
| 57 | #------------------------------------------------------------------------------\r |
| 58 | # Routine Description:\r |
| 59 | #\r |
| 60 | # Routine for switching stacks with 3 parameters UNIX ABI\r |
| 61 | #\r |
| 62 | # Arguments:\r |
| 63 | #\r |
| 64 | # (rdi) EntryPoint - Entry point with new stack.\r |
| 65 | # (rsi) Context1 - Parameter1 for entry point.\r |
| 66 | # (rdx) Context2 - Parameter2 for entry point.\r |
| 67 | # (rcx) Context3 - Parameter3 for entry point.\r |
| 68 | # (r8) NewStack - The pointer to new stack.\r |
| 69 | #\r |
| 70 | # Returns:\r |
| 71 | #\r |
| 72 | # None\r |
| 73 | #\r |
| 74 | #------------------------------------------------------------------------------\r |
| 75 | ASM_GLOBAL ASM_PFX(PeiSwitchStacks)\r |
| 76 | ASM_PFX(PeiSwitchStacks):\r |
| 77 | mov %rdi, %rax\r |
| 78 | mov %rsi, %rdi\r |
| 79 | mov %rdx, %rsi\r |
| 80 | mov %rcx, %rdx\r |
| 81 | mov %r8, %rsp\r |
| 82 | \r |
| 83 | \r |
| 84 | #\r |
| 85 | # Reserve space for redzone on the stack,\r |
| 86 | # in case the callee wishes to spill them.\r |
| 87 | #\r |
| 88 | lea -0x80(%rsp), %rsp\r |
| 89 | call *%rax\r |
| 90 | \r |
| 91 | \r |
| 92 | \r |
| 93 | #------------------------------------------------------------------------------\r |
| 94 | # VOID\r |
| 95 | # EFIAPI\r |
| 96 | # SecSwitchStack (\r |
| 97 | # UINT32 TemporaryMemoryBase, // Rcx, Rdi\r |
| 98 | # UINT32 PermenentMemoryBase // Rdx, Rsi\r |
| 99 | # );\r |
| 100 | #------------------------------------------------------------------------------ \r |
| 101 | ASM_GLOBAL ASM_PFX(SecSwitchStack)\r |
| 102 | ASM_PFX(SecSwitchStack):\r |
| 103 | \r |
| 104 | mov %rsp, %rax\r |
| 105 | sub %rdi, %rax\r |
| 106 | add %rsi, %rax\r |
| 107 | mov (%rip), %r10\r |
| 108 | mov %r10, (%rax) \r |
| 109 | ret\r |
| 110 | \r |
| 111 | |
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