| 1 | /* Copyright (C) 1993-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <sysdep.h> |
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| 19 | #include <features.h> |
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| 20 | |
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| 21 | #if defined(PIC) |
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| 22 | /* Put this at the end of libc's text segment so that all of |
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| 23 | the direct branches from the syscalls are forward, and |
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| 24 | thus predicted not taken. */ |
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| 25 | .section .text.last, "ax" , @progbits |
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| 26 | #else |
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| 27 | .text |
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| 28 | #endif |
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| 29 | |
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| 30 | #if IS_IN (libc) |
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| 31 | # define SYSCALL_ERROR_ERRNO __libc_errno |
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| 32 | #else |
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| 33 | # define SYSCALL_ERROR_ERRNO errno |
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| 34 | #endif |
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| 35 | |
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| 36 | .align 4 |
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| 37 | .globl __syscall_error |
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| 38 | .ent __syscall_error |
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| 39 | __syscall_error: |
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| 40 | /* When building a shared library, we branch here without having |
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| 41 | loaded the GP. Nor, since it was a direct branch, have we |
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| 42 | loaded PV with our address. |
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| 43 | |
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| 44 | When building a static library, we tail call here from another |
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| 45 | object file, possibly with a different GP, and must return with |
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| 46 | the GP of our caller in place so that linker relaxation works. |
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| 47 | |
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| 48 | Both issues are solved by computing the GP into T1 instead of |
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| 49 | clobbering the traditional GP register. */ |
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| 50 | .prologue 0 |
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| 51 | mov v0, t0 |
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| 52 | br t1, 1f |
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| 53 | 1: ldah t1, 0(t1) !gpdisp!1 |
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| 54 | call_pal PAL_rduniq |
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| 55 | |
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| 56 | lda t1, 0(t1) !gpdisp!1 |
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| 57 | ldq t1, SYSCALL_ERROR_ERRNO(t1) !gottprel |
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| 58 | addq v0, t1, t1 |
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| 59 | lda v0, -1 |
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| 60 | |
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| 61 | stl t0, 0(t1) |
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| 62 | ret |
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| 63 | |
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| 64 | .end __syscall_error |
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| 65 | |
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