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49ba9447 | 1 | #------------------------------------------------------------------------------\r |
2 | #\r | |
3 | # Copyright (c) 2008, Intel Corporation\r | |
4 | # All rights reserved. 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 | # 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 |