projects / mirror_edk2.git / blame
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|---|---|---|
| da351bdb PB |
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 | \r | |
| 14 | EXPORT SetJump\r | |
| 15 | EXPORT InternalLongJump\r | |
| 16 | AREA BaseLib_LowLevel, CODE, READONLY\r | |
| 17 | \r | |
| 18 | #define GPR_LAYOUT \\r | |
| 19 | REG_PAIR (x19, x20, #0); \\r | |
| 20 | REG_PAIR (x21, x22, #16); \\r | |
| 21 | REG_PAIR (x23, x24, #32); \\r | |
| 22 | REG_PAIR (x25, x26, #48); \\r | |
| 23 | REG_PAIR (x27, x28, #64); \\r | |
| 24 | REG_PAIR (x29, x30, #80);/*FP, LR*/ \\r | |
| 25 | REG_ONE (x16, #96) /*IP0*/\r | |
| 26 | \r | |
| 27 | #define FPR_LAYOUT \\r | |
| 28 | REG_PAIR ( d8, d9, #112); \\r | |
| 29 | REG_PAIR (d10, d11, #128); \\r | |
| 30 | REG_PAIR (d12, d13, #144); \\r | |
| 31 | REG_PAIR (d14, d15, #160);\r | |
| 32 | \r | |
| 33 | ;/**\r | |
| 34 | ; Saves the current CPU context that can be restored with a call to LongJump() and returns 0.#\r | |
| 35 | ;\r | |
| 36 | ; Saves the current CPU context in the buffer specified by JumpBuffer and returns 0. The initial\r | |
| 37 | ; call to SetJump() must always return 0. Subsequent calls to LongJump() cause a non-zero\r | |
| 38 | ; value to be returned by SetJump().\r | |
| 39 | ;\r | |
| 40 | ; If JumpBuffer is NULL, then ASSERT().\r | |
| 41 | ; For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().\r | |
| 42 | ;\r | |
| 43 | ; @param JumpBuffer A pointer to CPU context buffer.\r | |
| 44 | ;\r | |
| 45 | ;**/\r | |
| 46 | ;\r | |
| 47 | ;UINTN\r | |
| 48 | ;EFIAPI\r | |
| 49 | ;SetJump (\r | |
| 50 | ; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer // X0\r | |
| 51 | ; );\r | |
| 52 | ;\r | |
| 53 | SetJump\r | |
| 54 | mov x16, sp // use IP0 so save SP\r | |
| 55 | #define REG_PAIR(REG1, REG2, OFFS) stp REG1, REG2, [x0, OFFS]\r | |
| 56 | #define REG_ONE(REG1, OFFS) str REG1, [x0, OFFS]\r | |
| 57 | GPR_LAYOUT\r | |
| 58 | FPR_LAYOUT\r | |
| 59 | #undef REG_PAIR\r | |
| 60 | #undef REG_ONE\r | |
| 61 | mov w0, #0\r | |
| 62 | ret\r | |
| 63 | \r | |
| 64 | ;/**\r | |
| 65 | ; Restores the CPU context that was saved with SetJump().#\r | |
| 66 | ;\r | |
| 67 | ; Restores the CPU context from the buffer specified by JumpBuffer.\r | |
| 68 | ; This function never returns to the caller.\r | |
| 69 | ; Instead is resumes execution based on the state of JumpBuffer.\r | |
| 70 | ;\r | |
| 71 | ; @param JumpBuffer A pointer to CPU context buffer.\r | |
| 72 | ; @param Value The value to return when the SetJump() context is restored.\r | |
| 73 | ;\r | |
| 74 | ;**/\r | |
| 75 | ;VOID\r | |
| 76 | ;EFIAPI\r | |
| 77 | ;InternalLongJump (\r | |
| 78 | ; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer, // X0\r | |
| 79 | ; IN UINTN Value // X1\r | |
| 80 | ; );\r | |
| 81 | ;\r | |
| 82 | InternalLongJump\r | |
| 83 | #define REG_PAIR(REG1, REG2, OFFS) ldp REG1, REG2, [x0, OFFS]\r | |
| 84 | #define REG_ONE(REG1, OFFS) ldr REG1, [x0, OFFS]\r | |
| 85 | GPR_LAYOUT\r | |
| 86 | FPR_LAYOUT\r | |
| 87 | #undef REG_PAIR\r | |
| 88 | #undef REG_ONE\r | |
| 89 | mov sp, x16\r | |
| 90 | cmp w1, #0\r | |
| 91 | mov w0, #1\r | |
| 92 | beq exit\r | |
| 93 | mov w0, w1\r | |
| 94 | exit\r | |
| 95 | // use br not ret, as ret is guaranteed to mispredict\r | |
| 96 | br x30\r | |
| 97 | \r | |
| 98 | ASM_FUNCTION_REMOVE_IF_UNREFERENCED\r | |
| 99 | \r | |
| 100 | END\r | |
| 101 | \r |