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136 lines
3.2 KiB
ArmAsm
136 lines
3.2 KiB
ArmAsm
/* Copyright (C) 1993, 1996, 1998, 2002, 2003, 2004
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include <features.h>
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#if defined(__ELF__) && 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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#ifdef PIC
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/* When building a shared library, we branch here without
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having loaded the GP. Nor, since it was a direct branch,
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have we loaded PV with our address. Do both. */
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# define LOADGP br pv, 1f; 1: ldgp gp, 0(pv)
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# define PROLOGUE .prologue 0
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# define EPILOGUE
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#else
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/* When building the static library, we tail call here from
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elsewhere, which might use a different GP. The entertaining
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part is that we have to return with the GP of our caller
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in place, so that linker relaxation works properly. */
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/* ??? This is so ugly. Consider always putting the errno
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setting code with the syscall in the static case. */
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# define GPSAVEREG t10
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# define LOADGP ldah t11, 0(pv) !gpdisp!1; \
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br 1f; \
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.subsection 2; \
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1: mov gp, GPSAVEREG; \
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lda gp, 0(t11) !gpdisp!1; \
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br 2f; \
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.previous; \
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mov gp, GPSAVEREG; \
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2:
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# define PROLOGUE .prologue 1
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# define EPILOGUE mov GPSAVEREG, gp
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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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#if defined(_LIBC_REENTRANT) && USE___THREAD
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#ifndef NOT_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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LOADGP
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PROLOGUE
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mov v0, t0
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call_pal PAL_rduniq
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ldq t1, SYSCALL_ERROR_ERRNO(gp) !gottprel
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addq v0, t1, v0
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stl t0, 0(v0)
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lda v0, -1
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EPILOGUE
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ret
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#elif defined(_LIBC_REENTRANT)
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LOADGP
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lda sp, -32(sp)
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.frame sp, 32, ra, 0
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stq ra, 0(sp)
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stq v0, 8(sp)
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#ifdef GPSAVEREG
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stq GPSAVEREG, 16(sp)
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#endif
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.mask 0x4000001, -32
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PROLOGUE
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/* Find our per-thread errno address */
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#if defined PIC && !defined IS_IN_librt
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bsr ra, __errno_location !samegp
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#else
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jsr ra, __errno_location
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#ifndef GPSAVEREG
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ldgp gp, 0(ra)
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#endif
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#endif
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/* Store the error value. */
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ldq t0, 8(sp)
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stl t0, 0(v0)
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/* And kick back a -1. */
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ldi v0, -1
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#ifdef GPSAVEREG
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ldq GPSAVEREG, 16(sp)
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#endif
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ldq ra, 0(sp)
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lda sp, 32(sp)
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EPILOGUE
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ret
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#else
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LOADGP
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PROLOGUE
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stl v0, errno
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lda v0, -1
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EPILOGUE
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ret
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#endif
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.subsection 3
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.end __syscall_error
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