| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* setjmp for ARM. |
| 2 | Copyright (C) 1997-2015 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library. If not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <sysdep.h> |
| 20 | #include <stap-probe.h> |
| 21 | #include <bits/setjmp.h> |
| 22 | #include <rtld-global-offsets.h> |
| 23 | #include <arm-features.h> |
| 24 | |
| 25 | ENTRY (__sigsetjmp) |
| 26 | #ifdef PTR_MANGLE |
| 27 | PTR_MANGLE_LOAD (a3, ip) |
| 28 | #endif |
| 29 | mov ip, r0 |
| 30 | |
| 31 | /* setjmp probe expects sigsetjmp first argument (4@r0), second |
| 32 | argument (-4@r1), and target address (4@r14), respectively. */ |
| 33 | LIBC_PROBE (setjmp, 3, 4@r0, -4@r1, 4@r14) |
| 34 | |
| 35 | /* Save sp and lr */ |
| 36 | #ifdef PTR_MANGLE |
| 37 | mov a4, sp |
| 38 | PTR_MANGLE2 (a4, a4, a3) |
| 39 | sfi_breg ip, \ |
| 40 | str a4, [\B], #4 |
| 41 | PTR_MANGLE2 (a4, lr, a3) |
| 42 | sfi_breg ip, \ |
| 43 | str a4, [\B], #4 |
| 44 | #else |
| 45 | sfi_breg ip, \ |
| 46 | str sp, [\B], #4 |
| 47 | sfi_breg ip, \ |
| 48 | str lr, [\B], #4 |
| 49 | #endif |
| 50 | /* Save registers */ |
| 51 | sfi_breg ip, \ |
| 52 | stmia \B!, JMP_BUF_REGLIST |
| 53 | |
| 54 | #if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__ |
| 55 | # define NEED_HWCAP 1 |
| 56 | #endif |
| 57 | |
| 58 | #ifdef NEED_HWCAP |
| 59 | /* Check if we have a VFP unit. */ |
| 60 | # if IS_IN (rtld) |
| 61 | LDST_PCREL (ldr, a3, a4, \ |
| 62 | C_SYMBOL_NAME(_rtld_local_ro) \ |
| 63 | + RTLD_GLOBAL_RO_DL_HWCAP_OFFSET) |
| 64 | # else |
| 65 | # ifdef PIC |
| 66 | LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_rtld_global_ro), \ |
| 67 | RTLD_GLOBAL_RO_DL_HWCAP_OFFSET) |
| 68 | # else |
| 69 | LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_dl_hwcap), 0) |
| 70 | # endif |
| 71 | # endif |
| 72 | #endif |
| 73 | |
| 74 | #ifdef __SOFTFP__ |
| 75 | tst a3, #HWCAP_ARM_VFP |
| 76 | beq .Lno_vfp |
| 77 | #endif |
| 78 | |
| 79 | /* Store the VFP registers. |
| 80 | Don't use VFP instructions directly because this code |
| 81 | is used in non-VFP multilibs. */ |
| 82 | /* Following instruction is vstmia ip!, {d8-d15}. */ |
| 83 | sfi_breg ip, \ |
| 84 | stc p11, cr8, [\B], #64 |
| 85 | .Lno_vfp: |
| 86 | |
| 87 | #ifndef ARM_ASSUME_NO_IWMMXT |
| 88 | tst a3, #HWCAP_ARM_IWMMXT |
| 89 | beq .Lno_iwmmxt |
| 90 | |
| 91 | /* Save the call-preserved iWMMXt registers. */ |
| 92 | /* Following instructions are wstrd wr10, [ip], #8 (etc.) */ |
| 93 | sfi_breg r12, \ |
| 94 | stcl p1, cr10, [\B], #8 |
| 95 | sfi_breg r12, \ |
| 96 | stcl p1, cr11, [\B], #8 |
| 97 | sfi_breg r12, \ |
| 98 | stcl p1, cr12, [\B], #8 |
| 99 | sfi_breg r12, \ |
| 100 | stcl p1, cr13, [\B], #8 |
| 101 | sfi_breg r12, \ |
| 102 | stcl p1, cr14, [\B], #8 |
| 103 | sfi_breg r12, \ |
| 104 | stcl p1, cr15, [\B], #8 |
| 105 | .Lno_iwmmxt: |
| 106 | #endif |
| 107 | |
| 108 | /* Make a tail call to __sigjmp_save; it takes the same args. */ |
| 109 | B PLTJMP(C_SYMBOL_NAME(__sigjmp_save)) |
| 110 | |
| 111 | END (__sigsetjmp) |
| 112 | |
| 113 | hidden_def (__sigsetjmp) |