1 /* Copyright (C) 1993-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <https://www.gnu.org/licenses/>. */
22 /* Put this at the end of libc's text segment so that all of
23 the direct branches from the syscalls are forward, and
24 thus predicted not taken. */
25 .section .text.last, "ax", @progbits
31 # define SYSCALL_ERROR_ERRNO __libc_errno
33 # define SYSCALL_ERROR_ERRNO errno
37 .globl __syscall_error
40 /* When building a shared library, we branch here without having
41 loaded the GP. Nor, since it was a direct branch, have we
42 loaded PV with our address.
44 When building a static library, we tail call here from another
45 object file, possibly with a different GP, and must return with
46 the GP of our caller in place so that linker relaxation works.
48 Both issues are solved by computing the GP into T1 instead of
49 clobbering the traditional GP register. */
53 1: ldah t1, 0(t1) !gpdisp!1
56 lda t1, 0(t1) !gpdisp!1
57 ldq t1, SYSCALL_ERROR_ERRNO(t1) !gottprel