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da351bdb PB |
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 |
da351bdb PB |
5 | ;\r |
6 | ;------------------------------------------------------------------------------\r | |
7 | \r | |
8 | EXPORT SetJump\r | |
9 | EXPORT InternalLongJump\r | |
10 | AREA BaseLib_LowLevel, CODE, READONLY\r | |
11 | \r | |
12 | #define GPR_LAYOUT \\r | |
13 | REG_PAIR (x19, x20, #0); \\r | |
14 | REG_PAIR (x21, x22, #16); \\r | |
15 | REG_PAIR (x23, x24, #32); \\r | |
16 | REG_PAIR (x25, x26, #48); \\r | |
17 | REG_PAIR (x27, x28, #64); \\r | |
18 | REG_PAIR (x29, x30, #80);/*FP, LR*/ \\r | |
19 | REG_ONE (x16, #96) /*IP0*/\r | |
20 | \r | |
21 | #define FPR_LAYOUT \\r | |
22 | REG_PAIR ( d8, d9, #112); \\r | |
23 | REG_PAIR (d10, d11, #128); \\r | |
24 | REG_PAIR (d12, d13, #144); \\r | |
25 | REG_PAIR (d14, d15, #160);\r | |
26 | \r | |
27 | ;/**\r | |
28 | ; Saves the current CPU context that can be restored with a call to LongJump() and returns 0.#\r | |
29 | ;\r | |
30 | ; Saves the current CPU context in the buffer specified by JumpBuffer and returns 0. The initial\r | |
31 | ; call to SetJump() must always return 0. Subsequent calls to LongJump() cause a non-zero\r | |
32 | ; value to be returned by SetJump().\r | |
33 | ;\r | |
34 | ; If JumpBuffer is NULL, then ASSERT().\r | |
35 | ; For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().\r | |
36 | ;\r | |
37 | ; @param JumpBuffer A pointer to CPU context buffer.\r | |
38 | ;\r | |
39 | ;**/\r | |
40 | ;\r | |
41 | ;UINTN\r | |
42 | ;EFIAPI\r | |
43 | ;SetJump (\r | |
44 | ; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer // X0\r | |
45 | ; );\r | |
46 | ;\r | |
47 | SetJump\r | |
48 | mov x16, sp // use IP0 so save SP\r | |
49 | #define REG_PAIR(REG1, REG2, OFFS) stp REG1, REG2, [x0, OFFS]\r | |
50 | #define REG_ONE(REG1, OFFS) str REG1, [x0, OFFS]\r | |
51 | GPR_LAYOUT\r | |
52 | FPR_LAYOUT\r | |
53 | #undef REG_PAIR\r | |
54 | #undef REG_ONE\r | |
55 | mov w0, #0\r | |
56 | ret\r | |
57 | \r | |
58 | ;/**\r | |
59 | ; Restores the CPU context that was saved with SetJump().#\r | |
60 | ;\r | |
61 | ; Restores the CPU context from the buffer specified by JumpBuffer.\r | |
62 | ; This function never returns to the caller.\r | |
63 | ; Instead is resumes execution based on the state of JumpBuffer.\r | |
64 | ;\r | |
65 | ; @param JumpBuffer A pointer to CPU context buffer.\r | |
66 | ; @param Value The value to return when the SetJump() context is restored.\r | |
67 | ;\r | |
68 | ;**/\r | |
69 | ;VOID\r | |
70 | ;EFIAPI\r | |
71 | ;InternalLongJump (\r | |
72 | ; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer, // X0\r | |
73 | ; IN UINTN Value // X1\r | |
74 | ; );\r | |
75 | ;\r | |
76 | InternalLongJump\r | |
77 | #define REG_PAIR(REG1, REG2, OFFS) ldp REG1, REG2, [x0, OFFS]\r | |
78 | #define REG_ONE(REG1, OFFS) ldr REG1, [x0, OFFS]\r | |
79 | GPR_LAYOUT\r | |
80 | FPR_LAYOUT\r | |
81 | #undef REG_PAIR\r | |
82 | #undef REG_ONE\r | |
83 | mov sp, x16\r | |
84 | cmp w1, #0\r | |
85 | mov w0, #1\r | |
86 | beq exit\r | |
87 | mov w0, w1\r | |
88 | exit\r | |
89 | // use br not ret, as ret is guaranteed to mispredict\r | |
90 | br x30\r | |
91 | \r | |
92 | ASM_FUNCTION_REMOVE_IF_UNREFERENCED\r | |
93 | \r | |
94 | END\r | |
95 | \r |