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alpha: Don't check USE___THREAD in __syscall_error.

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This commit is contained in:
Richard Henderson 2012-02-15 12:19:03 -08:00
parent 4c85d632e4
commit 15be932dfc
2 changed files with 30 additions and 93 deletions
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5
ChangeLog.alpha
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@ -1,3 +1,8 @@
2012-02-15 Richard Henderson <rth@twiddle.net>
* sysdeps/unix/alpha/sysdeps.S: Don't check __ELF__, USE___THREAD,
or _LIBC_REENTRANT.
2012-02-15 Richard Henderson <rth@twiddle.net>
[BZ #13361]

118
sysdeps/unix/alpha/sysdep.S
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@ -1,4 +1,4 @@
/* Copyright (C) 1993, 1996, 1998, 2002, 2003, 2004
/* Copyright (C) 1993, 1996, 1998, 2002, 2003, 2004, 2012
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Brendan Kehoe (brendan@zen.org).
@ -21,7 +21,7 @@
#include <sysdep.h>
#include <features.h>
#if defined(__ELF__) && defined(PIC)
#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. */
@ -30,106 +30,38 @@
.text
#endif
#ifdef PIC
/* 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. Do both. */
# define LOADGP br pv, 1f; 1: ldgp gp, 0(pv)
# define PROLOGUE .prologue 0
# define EPILOGUE
#else
/* When building the static library, we tail call here from
elsewhere, which might use a different GP. The entertaining
part is that we have to return with the GP of our caller
in place, so that linker relaxation works properly. */
/* ??? This is so ugly. Consider always putting the errno
setting code with the syscall in the static case. */
# define GPSAVEREG t10
# define LOADGP ldah t11, 0(pv) !gpdisp!1; \
br 1f; \
.subsection 2; \
1: mov gp, GPSAVEREG; \
lda gp, 0(t11) !gpdisp!1; \
br 2f; \
.previous; \
mov gp, GPSAVEREG; \
2:
# define PROLOGUE .prologue 1
# define EPILOGUE mov GPSAVEREG, gp
#endif
.align 4
.globl __syscall_error
.ent __syscall_error
__syscall_error:
#if defined(_LIBC_REENTRANT) && USE___THREAD
#ifndef NOT_IN_libc
# define SYSCALL_ERROR_ERRNO __libc_errno
#else
# define SYSCALL_ERROR_ERRNO errno
#endif
LOADGP
PROLOGUE
.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
ldq t1, SYSCALL_ERROR_ERRNO(gp) !gottprel
addq v0, t1, v0
stl t0, 0(v0)
lda t1, 0(t1) !gpdisp!1
ldq t1, SYSCALL_ERROR_ERRNO(t1) !gottprel
addq v0, t1, t1
lda v0, -1
EPILOGUE
stl t0, 0(t1)
ret
#elif defined(_LIBC_REENTRANT)
LOADGP
lda sp, -32(sp)
.frame sp, 32, ra, 0
stq ra, 0(sp)
stq v0, 8(sp)
#ifdef GPSAVEREG
stq GPSAVEREG, 16(sp)
#endif
.mask 0x4000001, -32
PROLOGUE
/* Find our per-thread errno address */
#if defined PIC && !defined IS_IN_librt
bsr ra, __errno_location !samegp
#else
jsr ra, __errno_location
#ifndef GPSAVEREG
ldgp gp, 0(ra)
#endif
#endif
/* Store the error value. */
ldq t0, 8(sp)
stl t0, 0(v0)
/* And kick back a -1. */
ldi v0, -1
#ifdef GPSAVEREG
ldq GPSAVEREG, 16(sp)
#endif
ldq ra, 0(sp)
lda sp, 32(sp)
EPILOGUE
ret
#else
LOADGP
PROLOGUE
stl v0, errno
lda v0, -1
EPILOGUE
ret
#endif
.subsection 3
.end __syscall_error