projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 49ba9447 | 1 | #------------------------------------------------------------------------------\r |
| 2 | #\r | |
| 56d7640a HT |
3 | # Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>\r |
| 4 | # This program and the accompanying materials\r | |
| 49ba9447 | 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 | # Stack.asm\r | |
| 15 | #\r | |
| 16 | # Abstract:\r | |
| 17 | #\r | |
| 18 | # Switch the stack from temporary memory to permenent memory.\r | |
| 19 | #\r | |
| 20 | #------------------------------------------------------------------------------\r | |
| 21 | \r | |
| 22 | #------------------------------------------------------------------------------\r | |
| 23 | # VOID\r | |
| 24 | # EFIAPI\r | |
| 25 | # SecSwitchStack (\r | |
| 26 | # UINT32 TemporaryMemoryBase,\r | |
| 27 | # UINT32 PermenentMemoryBase\r | |
| 28 | # );\r | |
| 29 | #------------------------------------------------------------------------------ \r | |
| 30 | \r | |
| 31 | #include <ProcessorBind.h>\r | |
| 32 | \r | |
| 33 | ASM_GLOBAL ASM_PFX(SecSwitchStack)\r | |
| 34 | ASM_PFX(SecSwitchStack):\r | |
| 35 | #\r | |
| 36 | # Save three register: eax, ebx, ecx\r | |
| 37 | # \r | |
| 38 | push %eax\r | |
| 39 | push %ebx\r | |
| 40 | push %ecx\r | |
| 41 | push %edx\r | |
| 42 | \r | |
| 43 | #\r | |
| 44 | # !!CAUTION!! this function address's is pushed into stack after\r | |
| 45 | # migration of whole temporary memory, so need save it to permenent\r | |
| 46 | # memory at first!\r | |
| 47 | # \r | |
| 48 | \r | |
| 49 | movl 20(%esp), %ebx # Save the first parameter\r | |
| 50 | movl 24(%esp), %ecx # Save the second parameter\r | |
| 51 | \r | |
| 52 | #\r | |
| 53 | # Save this function's return address into permenent memory at first.\r | |
| 54 | # Then, Fixup the esp point to permenent memory\r | |
| 55 | #\r | |
| 56 | \r | |
| 57 | movl %esp, %eax\r | |
| 58 | subl %ebx, %eax\r | |
| 59 | addl %ecx, %eax\r | |
| 60 | movl (%esp), %edx # copy pushed register's value to permenent memory\r | |
| 61 | movl %edx, (%eax)\r | |
| 62 | movl 4(%esp), %edx\r | |
| 63 | movl %edx, 4(%eax)\r | |
| 64 | movl 8(%esp), %edx\r | |
| 65 | movl %edx, 8(%eax)\r | |
| 66 | movl 12(%esp), %edx\r | |
| 67 | movl %edx, 12(%eax)\r | |
| 68 | movl 16(%esp), %edx\r | |
| 69 | movl %edx, 16(%eax)\r | |
| 70 | movl %eax, %esp # From now, esp is pointed to permenent memory\r | |
| 71 | \r | |
| 72 | #\r | |
| 73 | # Fixup the ebp point to permenent memory\r | |
| 74 | #\r | |
| 75 | movl %ebp, %eax\r | |
| 76 | subl %ebx, %eax\r | |
| 77 | addl %ecx, %eax\r | |
| 78 | movl %eax, %ebp # From now, ebp is pointed to permenent memory\r | |
| 79 | \r | |
| 80 | #\r | |
| 81 | # Fixup callee's ebp point for PeiDispatch\r | |
| 82 | # \r | |
| 83 | movl (%ebp), %eax\r | |
| 84 | subl %ebx, %eax\r | |
| 85 | addl %ecx, %eax\r | |
| 86 | movl %eax, (%ebp) # From now, Temporary's PPI caller's stack is in permenent memory\r | |
| 87 | \r | |
| 88 | pop %edx\r | |
| 89 | pop %ecx\r | |
| 90 | pop %ebx\r | |
| 91 | pop %eax\r | |
| 92 | ret\r | |
| 93 | \r |