glibc/sysdeps/unix/sysv/linux/alpha/syscall.S
Roland McGrath c6481412ff * configure.in (ASM_ALPHA_NG_SYMBOL_PREFIX): Remove test.
* configure: Regenerated.
	* config.h.in (ASM_ALPHA_NG_SYMBOL_PREFIX): Remove #undef.
	* sysdeps/alpha/dl-machine.h (TRAMPOLINE_TEMPLATE): Use !samegp.
	(RTLD_START): Likewise.  Access _dl_skip_args, _rtld_local, and
	_dl_fini via gp-relative relocations.
	* sysdeps/alpha/fpu/e_sqrt.c: Use !samegp.

	* elf/tls-macros.h: Add alpha versions.
	* sysdeps/alpha/dl-machine.h (elf_machine_rela): Handle TLS relocs.
	* sysdeps/unix/alpha/sysdep.S: Support USE___THREAD.
	* sysdeps/unix/alpha/sysdep.h: Likewise.  Add SYSCALL_ERROR_HANDLER.
	* sysdeps/unix/sysv/linux/alpha/brk.S: Use it.
	* sysdeps/unix/sysv/linux/alpha/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/getitimer.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/getrusage.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/gettimeofday.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/rt_sigaction.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/select.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/setitimer.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/settimeofday.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/sigsuspend.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/syscall.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/utimes.S: Likewise.
	* sysdeps/unix/sysv/linux/alpha/wait4.S: Likewise.

	* sysdeps/unix/sysv/linux/alpha/sysdep.h: Re-include protect.
	Kill argument registers across the inline syscall.

	* sysdeps/unix/sysv/linux/alpha/clone.S: Add user_tid and tls args.

	* linuxthreads/sysdeps/alpha/tls.h: New file.
	* sysdeps/alpha/dl-tls.h: New file.
2002-11-08 02:20:41 +00:00

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2.2 KiB
ArmAsm

/* Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Mosberger <davidm@azstarnet.com>, 1996.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
/*
* This is for COMPATIBILITY with Linux/x86 only. Linux/Alpha system
* calls return an error indication in a3. This allows arbitrary 64bit
* values to be returned in v0 (because negative values are not
* mistaken as error numbers). However, C allows only one value to
* be returned, so the interface below folds the error indication passed in
* a3 back into v0: it sets v0 to -errno if an error occurs. Thus,
* no negative 64bit numbers can be returned. To avoid this problem,
* use assembly stubs wherever possible/convenient.
*
* Usage:
*
* long syscall(syscall_number, arg1, arg2, arg3, arg4, arg5)
*
* syscall_number = the index of the system call we're invoking
* arg1-arg5 = up to 5 integer arguments to the system call
*
* We need to do some arg shifting: the kernel expects the
* syscall number in v0 and the first five args in a0-a4.
*
*/
LEAF(__syscall, 0)
#ifdef PROF
ldgp gp, 0(pv)
.set noat
lda AT, _mcount
jsr AT, (AT), _mcount
.set at
.prologue 1
#else
.prologue 0
#endif
mov a0, v0 /* Syscall number -> v0 */
mov a1, a0 /* arg1-arg5 -> a0-a4 */
mov a2, a1
mov a3, a2
mov a4, a3
mov a5, a4
call_pal PAL_callsys /* Invoke system call */
bne a3, $error
ret
$error:
#ifndef PROF
br gp, 2f
2: ldgp gp, 0(gp)
#endif
SYSCALL_ERROR_HANDLER
END(__syscall)
weak_alias(__syscall, syscall)