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1 | #------------------------------------------------------------------------------ |
2 | # | |
4ea9375a HT |
3 | # Copyright (c) 2008, Intel Corporation. All rights reserved.<BR> |
4 | # This program and the accompanying materials | |
e8de4680 A |
5 | # are licensed and made available under the terms and conditions of the BSD License |
6 | # which accompanies this distribution. The full text of the license may be found at | |
7 | # http://opensource.org/licenses/bsd-license.php | |
8 | # | |
9 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
10 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
11 | # | |
12 | # Module Name: | |
13 | # ProcessorAsms.S | |
14 | # | |
15 | # Abstract: | |
16 | # This is separated from processor.c to allow this functions to be built with /O1 | |
17 | # | |
18 | # | |
19 | #------------------------------------------------------------------------------ | |
20 | #include <EfiBind.h> | |
21 | ||
22 | .text | |
23 | ||
24 | .globl ASM_PFX(SwitchStacks) | |
25 | .globl ASM_PFX(TransferControlSetJump) | |
26 | .globl ASM_PFX(TransferControlLongJump) | |
27 | ||
28 | # | |
29 | # Routine Description: | |
30 | # This allows the caller to switch the stack and goes to the new entry point | |
31 | # | |
32 | # Arguments: | |
33 | # EntryPoint - Pointer to the location to enter // rcx | |
34 | # Parameter - Parameter to pass in // rdx | |
35 | # NewStack - New Location of the stack // r8 | |
36 | # NewBsp - New BSP // r9 - not used | |
37 | # | |
38 | # Returns: | |
39 | # Nothing. Goes to the Entry Point passing in the new parameters | |
40 | # | |
41 | ASM_PFX(SwitchStacks): | |
42 | ||
43 | # Adjust stack for | |
44 | # 1) leave 4 registers space | |
45 | # 2) let it 16 bytes aligned after call | |
46 | sub $0x20,%r8 | |
47 | and -0x10,%r8w # do not assume 16 bytes aligned | |
48 | ||
49 | mov %r8,%rsp | |
50 | mov %rcx,%r10 | |
51 | mov %rdx,%rcx | |
52 | callq *%r10 | |
53 | ||
54 | # | |
55 | # no ret as we have a new stack and we jumped to the new location | |
56 | # | |
57 | ret | |
58 | ||
59 | #SwitchStacks ENDP | |
60 | ||
61 | ||
62 | .equ EFI_SUCCESS, 0 | |
63 | .equ EFI_WARN_RETURN_FROM_LONG_JUMP, 5 | |
64 | ||
65 | # | |
66 | #Routine Description: | |
67 | # | |
68 | # This routine implements the x64 variant of the SetJump call. Its | |
69 | # responsibility is to store system state information for a possible | |
70 | # subsequent LongJump. | |
71 | # | |
72 | #Arguments: | |
73 | # | |
74 | # Pointer to CPU context save buffer. | |
75 | # | |
76 | #Returns: | |
77 | # | |
78 | # EFI_SUCCESS | |
79 | # | |
80 | # EFI_STATUS | |
81 | # EFIAPI | |
82 | # TransferControlLongJump ( | |
83 | # IN EFI_PEI_TRANSFER_CONTROL_PROTOCOL *This, | |
84 | # IN EFI_JUMP_BUFFER *Jump | |
85 | # ); | |
86 | # | |
87 | # rcx - *This | |
88 | # rdx - JumpBuffer | |
89 | # | |
90 | ASM_PFX(TransferControlSetJump): | |
91 | mov %rbx,(%rdx) | |
92 | mov %rsp,0x8(%rdx) | |
93 | mov %rbp,0x10(%rdx) | |
94 | mov %rdi,0x18(%rdx) | |
95 | mov %rsi,0x20(%rdx) | |
96 | mov %r10,0x28(%rdx) | |
97 | mov %r11,0x30(%rdx) | |
98 | mov %r12,0x38(%rdx) | |
99 | mov %r13,0x40(%rdx) | |
100 | mov %r14,0x48(%rdx) | |
101 | mov %r15,0x50(%rdx) | |
102 | mov (%rsp),%rax | |
103 | mov %rax,0x58(%rdx) | |
104 | mov $0x0,%rax | |
105 | retq | |
106 | ||
107 | ||
108 | # | |
109 | # EFI_STATUS | |
110 | # EFIAPI | |
111 | # TransferControlLongJump ( | |
112 | # IN EFI_PEI_TRANSFER_CONTROL_PROTOCOL *This, // rcx | |
113 | # IN EFI_JUMP_BUFFER *Jump // rdx | |
114 | # ); | |
115 | # | |
116 | # | |
117 | ASM_PFX(TransferControlLongJump): | |
118 | # set return from SetJump to EFI_WARN_RETURN_FROM_LONG_JUMP | |
119 | mov $0x5,%rax | |
120 | mov (%rdx),%rbx | |
121 | mov 0x8(%rdx),%rsp | |
122 | mov 0x10(%rdx),%rbp | |
123 | mov 0x18(%rdx),%rdi | |
124 | mov 0x20(%rdx),%rsi | |
125 | mov 0x28(%rdx),%r10 | |
126 | mov 0x30(%rdx),%r11 | |
127 | mov 0x38(%rdx),%r12 | |
128 | mov 0x40(%rdx),%r13 | |
129 | mov 0x48(%rdx),%r14 | |
130 | mov 0x50(%rdx),%r15 | |
131 | add $0x8,%rsp | |
132 | jmpq *0x58(%rdx) | |
133 | mov $0x5,%rax | |
134 | retq | |
135 |