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807e2604 HL |
1 | #------------------------------------------------------------------------------\r |
2 | #\r | |
3 | # Copyright (c) 2009-2013, ARM Ltd. All rights reserved.\r | |
9344f092 | 4 | # SPDX-License-Identifier: BSD-2-Clause-Patent\r |
807e2604 HL |
5 | #\r |
6 | #------------------------------------------------------------------------------\r | |
7 | .text\r | |
8 | .p2align 3\r | |
9 | \r | |
0f895683 OM |
10 | GCC_ASM_EXPORT(SetJump)\r |
11 | GCC_ASM_EXPORT(InternalLongJump)\r | |
807e2604 HL |
12 | \r |
13 | #define GPR_LAYOUT \\r | |
14 | REG_PAIR (x19, x20, 0); \\r | |
15 | REG_PAIR (x21, x22, 16); \\r | |
16 | REG_PAIR (x23, x24, 32); \\r | |
17 | REG_PAIR (x25, x26, 48); \\r | |
18 | REG_PAIR (x27, x28, 64); \\r | |
19 | REG_PAIR (x29, x30, 80);/*FP, LR*/ \\r | |
20 | REG_ONE (x16, 96) /*IP0*/\r | |
21 | \r | |
22 | #define FPR_LAYOUT \\r | |
23 | REG_PAIR ( d8, d9, 112); \\r | |
24 | REG_PAIR (d10, d11, 128); \\r | |
25 | REG_PAIR (d12, d13, 144); \\r | |
26 | REG_PAIR (d14, d15, 160);\r | |
27 | \r | |
28 | #/**\r | |
29 | # Saves the current CPU context that can be restored with a call to LongJump() and returns 0.#\r | |
30 | #\r | |
31 | # Saves the current CPU context in the buffer specified by JumpBuffer and returns 0. The initial\r | |
32 | # call to SetJump() must always return 0. Subsequent calls to LongJump() cause a non-zero\r | |
33 | # value to be returned by SetJump().\r | |
34 | #\r | |
35 | # If JumpBuffer is NULL, then ASSERT().\r | |
36 | # For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().\r | |
37 | #\r | |
38 | # @param JumpBuffer A pointer to CPU context buffer.\r | |
39 | #\r | |
40 | #**/\r | |
41 | #\r | |
42 | #UINTN\r | |
43 | #EFIAPI\r | |
44 | #SetJump (\r | |
45 | # IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer // X0\r | |
46 | # );\r | |
47 | #\r | |
48 | ASM_PFX(SetJump):\r | |
49 | mov x16, sp // use IP0 so save SP\r | |
50 | #define REG_PAIR(REG1, REG2, OFFS) stp REG1, REG2, [x0, OFFS]\r | |
51 | #define REG_ONE(REG1, OFFS) str REG1, [x0, OFFS]\r | |
52 | GPR_LAYOUT\r | |
53 | FPR_LAYOUT\r | |
54 | #undef REG_PAIR\r | |
55 | #undef REG_ONE\r | |
56 | mov w0, #0\r | |
57 | ret\r | |
58 | \r | |
59 | #/**\r | |
60 | # Restores the CPU context that was saved with SetJump().#\r | |
61 | #\r | |
62 | # Restores the CPU context from the buffer specified by JumpBuffer.\r | |
63 | # This function never returns to the caller.\r | |
64 | # Instead is resumes execution based on the state of JumpBuffer.\r | |
65 | #\r | |
66 | # @param JumpBuffer A pointer to CPU context buffer.\r | |
67 | # @param Value The value to return when the SetJump() context is restored.\r | |
68 | #\r | |
69 | #**/\r | |
70 | #VOID\r | |
71 | #EFIAPI\r | |
72 | #InternalLongJump (\r | |
73 | # IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer, // X0\r | |
74 | # IN UINTN Value // X1\r | |
75 | # );\r | |
76 | #\r | |
77 | ASM_PFX(InternalLongJump):\r | |
78 | #define REG_PAIR(REG1, REG2, OFFS) ldp REG1, REG2, [x0, OFFS]\r | |
79 | #define REG_ONE(REG1, OFFS) ldr REG1, [x0, OFFS]\r | |
80 | GPR_LAYOUT\r | |
81 | FPR_LAYOUT\r | |
82 | #undef REG_PAIR\r | |
83 | #undef REG_ONE\r | |
84 | mov sp, x16\r | |
85 | cmp w1, #0\r | |
86 | mov w0, #1\r | |
87 | csel w0, w1, w0, ne\r | |
88 | // use br not ret, as ret is guaranteed to mispredict\r | |
89 | br x30\r | |
90 | \r | |
91 | ASM_FUNCTION_REMOVE_IF_UNREFERENCED\r |