projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 554066b8 MS |
1 | /* Save current context. |
| 2 | ||
| dff8da6b | 3 | Copyright (C) 2009-2024 Free Software Foundation, Inc. |
| 554066b8 MS |
4 | |
| 5 | This file is part of the GNU C Library. | |
| 6 | ||
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 8 | modify it under the terms of the GNU Lesser General Public License as | |
| 9 | published by the Free Software Foundation; either version 2.1 of the | |
| 10 | License, or (at your option) any later version. | |
| 11 | ||
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | Lesser General Public License for more details. | |
| 16 | ||
| 17 | You should have received a copy of the GNU Lesser General Public | |
| 18 | License along with the GNU C Library; if not, see | |
| 5a82c748 | 19 | <https://www.gnu.org/licenses/>. */ |
| 554066b8 MS |
20 | |
| 21 | #include <sysdep.h> | |
| 22 | #include "ucontext_i.h" | |
| 23 | #include "ucontext-internal.h" | |
| 24 | ||
| 25 | /* int getcontext (ucontext_t *ucp) | |
| 26 | ||
| 27 | Returns 0 on success -1 and errno on failure. | |
| 28 | */ | |
| 29 | ||
| 30 | .text | |
| 31 | ||
| 32 | ENTRY(__getcontext) | |
| 45b1e17e | 33 | PTR_ARG (0) |
| 554066b8 MS |
34 | /* The saved context will return to the getcontext() call point |
| 35 | with a return value of 0 */ | |
| 36 | str xzr, [x0, oX0 + 0 * SZREG] | |
| 37 | ||
| 38 | stp x18, x19, [x0, oX0 + 18 * SZREG] | |
| 39 | stp x20, x21, [x0, oX0 + 20 * SZREG] | |
| 40 | stp x22, x23, [x0, oX0 + 22 * SZREG] | |
| 41 | stp x24, x25, [x0, oX0 + 24 * SZREG] | |
| 42 | stp x26, x27, [x0, oX0 + 26 * SZREG] | |
| 43 | stp x28, x29, [x0, oX0 + 28 * SZREG] | |
| 44 | str x30, [x0, oX0 + 30 * SZREG] | |
| 45 | ||
| 46 | /* Place LR into the saved PC, this will ensure that when | |
| 47 | switching to this saved context with setcontext() control | |
| 48 | will pass back to the caller of getcontext(), we have | |
| 49 | already arrange to return the appropriate return value in x0 | |
| 50 | above. */ | |
| 51 | str x30, [x0, oPC] | |
| 52 | ||
| 53 | /* Save the current SP */ | |
| 54 | mov x2, sp | |
| 55 | str x2, [x0, oSP] | |
| 56 | ||
| 6e445a3d | 57 | /* Initialize the pstate. */ |
| 03ea4d9b | 58 | str xzr, [x0, oPSTATE] |
| 6e445a3d | 59 | |
| 554066b8 MS |
60 | /* Figure out where to place the first context extension |
| 61 | block. */ | |
| 62 | add x2, x0, #oEXTENSION | |
| 63 | ||
| 64 | /* Write the context extension fpsimd header. */ | |
| 65 | mov w3, #(FPSIMD_MAGIC & 0xffff) | |
| 66 | movk w3, #(FPSIMD_MAGIC >> 16), lsl #16 | |
| 67 | str w3, [x2, #oHEAD + oMAGIC] | |
| 68 | mov w3, #FPSIMD_CONTEXT_SIZE | |
| 69 | str w3, [x2, #oHEAD + oSIZE] | |
| 70 | ||
| 71 | /* Fill in the FP SIMD context. */ | |
| 72 | add x3, x2, #oV0 + 8 * SZVREG | |
| 2b1d7148 SN |
73 | stp q8, q9, [x3], # 2 * SZVREG |
| 74 | stp q10, q11, [x3], # 2 * SZVREG | |
| 75 | stp q12, q13, [x3], # 2 * SZVREG | |
| 76 | stp q14, q15, [x3], # 2 * SZVREG | |
| 554066b8 MS |
77 | |
| 78 | add x3, x2, oFPSR | |
| 79 | ||
| 80 | mrs x4, fpsr | |
| 81 | str w4, [x3] | |
| 82 | ||
| 83 | mrs x4, fpcr | |
| 84 | str w4, [x3, oFPCR - oFPSR] | |
| 85 | ||
| 86 | /* Write the termination context extension header. */ | |
| 87 | add x2, x2, #FPSIMD_CONTEXT_SIZE | |
| 88 | ||
| 09c6c607 SN |
89 | str wzr, [x2, #oHEAD + oMAGIC] |
| 90 | str wzr, [x2, #oHEAD + oSIZE] | |
| 554066b8 MS |
91 | |
| 92 | /* Grab the signal mask */ | |
| 93 | /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */ | |
| 389d1f1b | 94 | add PTR_REG (2), PTR_REG (0), #UCONTEXT_SIGMASK |
| 554066b8 MS |
95 | mov x0, SIG_BLOCK |
| 96 | mov x1, 0 | |
| 97 | mov x3, _NSIG8 | |
| 98 | mov x8, SYS_ify (rt_sigprocmask) | |
| 99 | svc 0 | |
| 100 | cbnz x0, 1f | |
| 101 | ||
| 102 | /* Return 0 for success */ | |
| 103 | mov x0, 0 | |
| 104 | RET | |
| 105 | 1: | |
| 106 | b C_SYMBOL_NAME(__syscall_error) | |
| 107 | ||
| 108 | PSEUDO_END (__getcontext) | |
| 109 | weak_alias (__getcontext, getcontext) |