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1 | #------------------------------------------------------------------------------\r |
2 | #\r | |
3 | # Copyright (c) 2009-2013, ARM Ltd. All rights reserved.\r | |
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 | #------------------------------------------------------------------------------\r | |
13 | .text\r | |
14 | .p2align 3\r | |
15 | \r | |
16 | ASM_GLOBAL ASM_PFX(SetJump)\r | |
17 | ASM_GLOBAL ASM_PFX(InternalLongJump)\r | |
18 | \r | |
19 | #define GPR_LAYOUT \\r | |
20 | REG_PAIR (x19, x20, 0); \\r | |
21 | REG_PAIR (x21, x22, 16); \\r | |
22 | REG_PAIR (x23, x24, 32); \\r | |
23 | REG_PAIR (x25, x26, 48); \\r | |
24 | REG_PAIR (x27, x28, 64); \\r | |
25 | REG_PAIR (x29, x30, 80);/*FP, LR*/ \\r | |
26 | REG_ONE (x16, 96) /*IP0*/\r | |
27 | \r | |
28 | #define FPR_LAYOUT \\r | |
29 | REG_PAIR ( d8, d9, 112); \\r | |
30 | REG_PAIR (d10, d11, 128); \\r | |
31 | REG_PAIR (d12, d13, 144); \\r | |
32 | REG_PAIR (d14, d15, 160);\r | |
33 | \r | |
34 | #/**\r | |
35 | # Saves the current CPU context that can be restored with a call to LongJump() and returns 0.#\r | |
36 | #\r | |
37 | # Saves the current CPU context in the buffer specified by JumpBuffer and returns 0. The initial\r | |
38 | # call to SetJump() must always return 0. Subsequent calls to LongJump() cause a non-zero\r | |
39 | # value to be returned by SetJump().\r | |
40 | #\r | |
41 | # If JumpBuffer is NULL, then ASSERT().\r | |
42 | # For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().\r | |
43 | #\r | |
44 | # @param JumpBuffer A pointer to CPU context buffer.\r | |
45 | #\r | |
46 | #**/\r | |
47 | #\r | |
48 | #UINTN\r | |
49 | #EFIAPI\r | |
50 | #SetJump (\r | |
51 | # IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer // X0\r | |
52 | # );\r | |
53 | #\r | |
54 | ASM_PFX(SetJump):\r | |
55 | mov x16, sp // use IP0 so save SP\r | |
56 | #define REG_PAIR(REG1, REG2, OFFS) stp REG1, REG2, [x0, OFFS]\r | |
57 | #define REG_ONE(REG1, OFFS) str REG1, [x0, OFFS]\r | |
58 | GPR_LAYOUT\r | |
59 | FPR_LAYOUT\r | |
60 | #undef REG_PAIR\r | |
61 | #undef REG_ONE\r | |
62 | mov w0, #0\r | |
63 | ret\r | |
64 | \r | |
65 | #/**\r | |
66 | # Restores the CPU context that was saved with SetJump().#\r | |
67 | #\r | |
68 | # Restores the CPU context from the buffer specified by JumpBuffer.\r | |
69 | # This function never returns to the caller.\r | |
70 | # Instead is resumes execution based on the state of JumpBuffer.\r | |
71 | #\r | |
72 | # @param JumpBuffer A pointer to CPU context buffer.\r | |
73 | # @param Value The value to return when the SetJump() context is restored.\r | |
74 | #\r | |
75 | #**/\r | |
76 | #VOID\r | |
77 | #EFIAPI\r | |
78 | #InternalLongJump (\r | |
79 | # IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer, // X0\r | |
80 | # IN UINTN Value // X1\r | |
81 | # );\r | |
82 | #\r | |
83 | ASM_PFX(InternalLongJump):\r | |
84 | #define REG_PAIR(REG1, REG2, OFFS) ldp REG1, REG2, [x0, OFFS]\r | |
85 | #define REG_ONE(REG1, OFFS) ldr REG1, [x0, OFFS]\r | |
86 | GPR_LAYOUT\r | |
87 | FPR_LAYOUT\r | |
88 | #undef REG_PAIR\r | |
89 | #undef REG_ONE\r | |
90 | mov sp, x16\r | |
91 | cmp w1, #0\r | |
92 | mov w0, #1\r | |
93 | csel w0, w1, w0, ne\r | |
94 | // use br not ret, as ret is guaranteed to mispredict\r | |
95 | br x30\r | |
96 | \r | |
97 | ASM_FUNCTION_REMOVE_IF_UNREFERENCED\r |