| /* Copyright (C) 1993-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Brendan Kehoe (brendan@zen.org). |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #include <features.h> |
| |
| #if defined(PIC) |
| /* Put this at the end of libc's text segment so that all of |
| the direct branches from the syscalls are forward, and |
| thus predicted not taken. */ |
| .section .text.last, "ax", @progbits |
| #else |
| .text |
| #endif |
| |
| #ifndef NOT_IN_libc |
| # define SYSCALL_ERROR_ERRNO __libc_errno |
| #else |
| # define SYSCALL_ERROR_ERRNO errno |
| #endif |
| |
| .align 4 |
| .globl __syscall_error |
| .ent __syscall_error |
| __syscall_error: |
| /* When building a shared library, we branch here without having |
| loaded the GP. Nor, since it was a direct branch, have we |
| loaded PV with our address. |
| |
| When building a static library, we tail call here from another |
| object file, possibly with a different GP, and must return with |
| the GP of our caller in place so that linker relaxation works. |
| |
| Both issues are solved by computing the GP into T1 instead of |
| clobbering the traditional GP register. */ |
| .prologue 0 |
| mov v0, t0 |
| br t1, 1f |
| 1: ldah t1, 0(t1) !gpdisp!1 |
| call_pal PAL_rduniq |
| |
| lda t1, 0(t1) !gpdisp!1 |
| ldq t1, SYSCALL_ERROR_ERRNO(t1) !gottprel |
| addq v0, t1, t1 |
| lda v0, -1 |
| |
| stl t0, 0(t1) |
| ret |
| |
| .end __syscall_error |
