projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |