| | 1 | #/** @file\r |
| | 2 | # \r |
| | 3 | # This code provides low level routines that support the Virtual Machine\r |
| | 4 | # for option ROMs.\r |
| | 5 | # \r |
| | 6 | # Copyright (c) 2007 - 2008, Intel Corporation. All rights reserved.<BR>\r |
| | 7 | # This program and the accompanying materials\r |
| | 8 | # are licensed and made available under the terms and conditions of the BSD License\r |
| | 9 | # which accompanies this distribution. The full text of the license may be found at\r |
| | 10 | # http://opensource.org/licenses/bsd-license.php\r |
| | 11 | # \r |
| | 12 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
| | 13 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
| | 14 | # \r |
| | 15 | #**/\r |
| | 16 | \r |
| | 17 | #---------------------------------------------------------------------------\r |
| | 18 | # Equate files needed.\r |
| | 19 | #---------------------------------------------------------------------------\r |
| | 20 | \r |
| | 21 | #---------------------------------------------------------------------------\r |
| | 22 | ##GenericPostSegment SEGMENT USE16\r |
| | 23 | #---------------------------------------------------------------------------\r |
| | 24 | \r |
| | 25 | #****************************************************************************\r |
| | 26 | # EbcLLCALLEX\r |
| | 27 | #\r |
| | 28 | # This function is called to execute an EBC CALLEX instruction.\r |
| | 29 | # This instruction requires that we thunk out to external native\r |
| | 30 | # code. For x64, we switch stacks, copy the arguments to the stack\r |
| | 31 | # and jump to the specified function.\r |
| | 32 | # On return, we restore the stack pointer to its original location.\r |
| | 33 | #\r |
| | 34 | # Destroys no working registers.\r |
| | 35 | #****************************************************************************\r |
| | 36 | ASM_GLOBAL _CopyMem;\r |
| | 37 | \r |
| | 38 | # VOID EbcLLCALLEXNative(UINTN FuncAddr, UINTN NewStackPointer, VOID *FramePtr)\r |
| | 39 | ASM_GLOBAL ASM_PFX(EbcLLCALLEXNative);\r |
| | 40 | ASM_PFX(EbcLLCALLEXNative):\r |
| | 41 | push %rbp\r |
| | 42 | push %rbx\r |
| | 43 | mov %rsp, %rbp\r |
| | 44 | # Function prolog\r |
| | 45 | \r |
| | 46 | # Copy FuncAddr to a preserved register.\r |
| | 47 | mov %rcx, %rbx\r |
| | 48 | \r |
| | 49 | # Set stack pointer to new value\r |
| | 50 | sub %rdx, %r8 \r |
| | 51 | sub %r8, %rsp \r |
| | 52 | mov %rsp, %rcx\r |
| | 53 | sub $0x20, %rsp \r |
| | 54 | call ASM_PFX(CopyMem)\r |
| | 55 | add $0x20, %rsp\r |
| | 56 | \r |
| | 57 | # Considering the worst case, load 4 potiential arguments\r |
| | 58 | # into registers.\r |
| | 59 | mov (%rsp), %rcx\r |
| | 60 | mov 0x8(%rsp), %rdx\r |
| | 61 | mov 0x10(%rsp), %r8\r |
| | 62 | mov 0x18(%rsp), %r9\r |
| | 63 | \r |
| | 64 | # Now call the external routine\r |
| | 65 | call *%rbx\r |
| | 66 | \r |
| | 67 | # Function epilog\r |
| | 68 | mov %rbp, %rsp\r |
| | 69 | pop %rbx\r |
| | 70 | pop %rbp\r |
| | 71 | ret\r |
| | 72 | \r |
| | 73 | \r |
| | 74 | # UINTN EbcLLGetEbcEntryPoint(VOID);\r |
| | 75 | # Routine Description:\r |
| | 76 | # The VM thunk code stuffs an EBC entry point into a processor\r |
| | 77 | # register. Since we can't use inline assembly to get it from\r |
| | 78 | # the interpreter C code, stuff it into the return value\r |
| | 79 | # register and return.\r |
| | 80 | #\r |
| | 81 | # Arguments:\r |
| | 82 | # None.\r |
| | 83 | #\r |
| | 84 | # Returns:\r |
| | 85 | # The contents of the register in which the entry point is passed.\r |
| | 86 | #\r |
| | 87 | ASM_GLOBAL ASM_PFX(EbcLLGetEbcEntryPoint);\r |
| | 88 | ASM_PFX(EbcLLGetEbcEntryPoint):\r |
| | 89 | mov %r10, %rax\r |
| | 90 | ret\r |
| | 91 | \r |
| | 92 | #/*++\r |
| | 93 | #\r |
| | 94 | #Routine Description:\r |
| | 95 | #\r |
| | 96 | # Return the caller's value of the stack pointer.\r |
| | 97 | #\r |
| | 98 | #Arguments:\r |
| | 99 | #\r |
| | 100 | # None.\r |
| | 101 | #\r |
| | 102 | #Returns:\r |
| | 103 | #\r |
| | 104 | # The current value of the stack pointer for the caller. We\r |
| | 105 | # adjust it by 4 here because when they called us, the return address\r |
| | 106 | # is put on the stack, thereby lowering it by 4 bytes.\r |
| | 107 | #\r |
| | 108 | #--*/\r |
| | 109 | \r |
| | 110 | # UINTN EbcLLGetStackPointer()\r |
| | 111 | ASM_GLOBAL ASM_PFX(EbcLLGetStackPointer);\r |
| | 112 | ASM_PFX(EbcLLGetStackPointer):\r |
| | 113 | mov %rsp, %rax\r |
| | 114 | # Stack adjusted by this much when we were called,\r |
| | 115 | # For this function, it's 4.\r |
| | 116 | add $4, %rax\r |
| | 117 | ret\r |
| | 118 | \r |
| | 119 | ASM_GLOBAL ASM_PFX(EbcLLGetReturnValue);\r |
| | 120 | ASM_PFX(EbcLLGetReturnValue):\r |
| | 121 | # UINT64 EbcLLGetReturnValue(VOID);\r |
| | 122 | # Routine Description:\r |
| | 123 | # When EBC calls native, on return the VM has to stuff the return\r |
| | 124 | # value into a VM register. It's assumed here that the value is still\r |
| | 125 | # in the register, so simply return and the caller should get the\r |
| | 126 | # return result properly.\r |
| | 127 | #\r |
| | 128 | # Arguments:\r |
| | 129 | # None.\r |
| | 130 | #\r |
| | 131 | # Returns:\r |
| | 132 | # The unmodified value returned by the native code.\r |
| | 133 | #\r |
| | 134 | ret\r |
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