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66 lines
2.0 KiB
ArmAsm
66 lines
2.0 KiB
ArmAsm
/* Copyright (C) 1993-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Brendan Kehoe (brendan@zen.org).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <features.h>
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#if defined(PIC)
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/* Put this at the end of libc's text segment so that all of
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the direct branches from the syscalls are forward, and
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thus predicted not taken. */
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.section .text.last, "ax", @progbits
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#else
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.text
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#endif
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#if IS_IN (libc)
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# define SYSCALL_ERROR_ERRNO __libc_errno
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#else
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# define SYSCALL_ERROR_ERRNO errno
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#endif
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.align 4
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.globl __syscall_error
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.ent __syscall_error
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__syscall_error:
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/* When building a shared library, we branch here without having
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loaded the GP. Nor, since it was a direct branch, have we
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loaded PV with our address.
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When building a static library, we tail call here from another
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object file, possibly with a different GP, and must return with
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the GP of our caller in place so that linker relaxation works.
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Both issues are solved by computing the GP into T1 instead of
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clobbering the traditional GP register. */
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.prologue 0
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mov v0, t0
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br t1, 1f
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1: ldah t1, 0(t1) !gpdisp!1
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call_pal PAL_rduniq
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lda t1, 0(t1) !gpdisp!1
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ldq t1, SYSCALL_ERROR_ERRNO(t1) !gottprel
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addq v0, t1, t1
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lda v0, -1
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stl t0, 0(t1)
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ret
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.end __syscall_error
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