projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| c8ec22a2 JY |
1 | #------------------------------------------------------------------------------\r |
| 2 | #\r | |
| d5fb1edf | 3 | # Copyright (c) 2014 - 2015, Intel Corporation. All rights reserved.<BR>\r |
| c8ec22a2 JY |
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 | # Abstract:\r | |
| 13 | #\r | |
| 14 | # Switch the stack from temporary memory to permenent memory.\r | |
| 15 | #\r | |
| 16 | #------------------------------------------------------------------------------\r | |
| 17 | \r | |
| 18 | ASM_GLOBAL ASM_PFX(SecSwitchStack)\r | |
| 19 | \r | |
| 20 | #------------------------------------------------------------------------------\r | |
| 21 | # VOID\r | |
| 22 | # EFIAPI\r | |
| 23 | # SecSwitchStack (\r | |
| 24 | # UINT32 TemporaryMemoryBase,\r | |
| 25 | # UINT32 PermenentMemoryBase\r | |
| 26 | # )\r | |
| 27 | #------------------------------------------------------------------------------\r | |
| 28 | ASM_GLOBAL ASM_PFX(SecSwitchStack)\r | |
| 29 | ASM_PFX(SecSwitchStack):\r | |
| 30 | #\r | |
| d5fb1edf | 31 | # Save four registers: eax, ebx, ecx, edx\r |
| c8ec22a2 | 32 | #\r |
| d5fb1edf JY |
33 | pushl %eax\r |
| 34 | pushl %ebx\r | |
| 35 | pushl %ecx\r | |
| 36 | pushl %edx\r | |
| c8ec22a2 JY |
37 | \r |
| 38 | #\r | |
| 39 | # !!CAUTION!! this function address's is pushed into stack after\r | |
| 40 | # migration of whole temporary memory, so need save it to permenent\r | |
| 41 | # memory at first!\r | |
| 42 | #\r | |
| 43 | \r | |
| 44 | movl 20(%esp), %ebx # Save the first parameter\r | |
| 45 | movl 24(%esp), %ecx # Save the second parameter\r | |
| 46 | \r | |
| 47 | #\r | |
| 48 | # Save this function's return address into permenent memory at first.\r | |
| 49 | # Then, Fixup the esp point to permenent memory\r | |
| 50 | #\r | |
| 51 | \r | |
| 52 | movl %esp, %eax\r | |
| 53 | subl %ebx, %eax\r | |
| 54 | addl %ecx, %eax\r | |
| 55 | movl (%esp), %edx # copy pushed register's value to permenent memory\r | |
| 56 | movl %edx, (%eax)\r | |
| 57 | movl 4(%esp), %edx\r | |
| 58 | movl %edx, 4(%eax)\r | |
| 59 | movl 8(%esp), %edx\r | |
| 60 | movl %edx, 8(%eax)\r | |
| 61 | movl 12(%esp), %edx\r | |
| 62 | movl %edx, 12(%eax)\r | |
| 63 | movl 16(%esp), %edx # Update this function's return address into permenent memory\r | |
| 64 | movl %edx, 16(%eax)\r | |
| 65 | movl %eax, %esp # From now, esp is pointed to permenent memory\r | |
| 66 | \r | |
| 67 | #\r | |
| 68 | # Fixup the ebp point to permenent memory\r | |
| 69 | #\r | |
| c8ec22a2 JY |
70 | movl %ebp, %eax\r |
| 71 | subl %ebx, %eax\r | |
| 72 | addl %ecx, %eax\r | |
| 73 | movl %eax, %ebp # From now, ebp is pointed to permenent memory\r | |
| 74 | \r | |
| 75 | #\r | |
| 76 | # Fixup callee's ebp point for PeiDispatch\r | |
| 77 | #\r | |
| d5fb1edf JY |
78 | # movl %ebp, %eax\r |
| 79 | # subl %ebx, %eax\r | |
| 80 | # addl %ecx, %eax\r | |
| 81 | # movl %eax, %ebp # From now, ebp is pointed to permenent memory\r | |
| 82 | popl %edx\r | |
| 83 | popl %ecx\r | |
| 84 | popl %ebx\r | |
| 85 | popl %eax \r | |
| c8ec22a2 | 86 | ret |