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24c177a079
* sysdeps/alpha/_mcount.S, sysdeps/alpha/bb_init_func.S, sysdeps/alpha/bsd-setjmp.S, sysdeps/alpha/ffs.S, sysdeps/alpha/htonl.S, sysdeps/alpha/htons.S, sysdeps/alpha/memchr.S, sysdeps/alpha/setjmp.S, sysdeps/alpha/strlen.S, sysdeps/alpha/udiv_qrnnd.S, sysdeps/unix/sysv/linux/alpha/brk.S, sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S, sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S, sysdeps/unix/sysv/linux/alpha/pipe.S, sysdeps/unix/sysv/linux/sigsuspend.S, sysdeps/unix/sysv/linux/alpha/syscall.S, sysdeps/unix/sysv/linux/alpha/sysdep.S: Remove include of regdef.h. sysdep.h includes it now. Replace ENTRY by LEAF with appropriate framesize declaration. Replace "lda pv,sym/jsr pv" by "jsr sym".
61 lines
2.0 KiB
ArmAsm
61 lines
2.0 KiB
ArmAsm
/* Copyright (C) 1996 Free Software Foundation, Inc.
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Contributed by David Mosberger (davidm@azstarnet.com).
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <sysdep.h>
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/*
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* This is for COMPATIBILITY with Linux/x86 only. Linux/Alpha system
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* calls return an error indication in a3. This allows to return
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* arbitrary 64bit values in v0 (because negative values are not
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* mistaken as error numbers). However, C allows to return only one
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* value so the interface below folds the error indication passed in
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* a3 back into v0: it sets v0 to -errno if an error occurs. Thus,
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* no negative 64bit numbers can be returned. To avoid this problem,
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* use assembly stubs wherever possible/convenient.
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*
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* Usage:
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*
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* long syscall(syscall_number, arg1, arg2, arg3, arg4, arg5)
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*
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* syscall_number = the index of the system call we're invoking
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* arg1-arg5 = up to 5 integer arguments to the system call
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*
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* We need to do some arg shifting: the kernel expects the
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* syscall number in v0 and the first five args in a0-a4.
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*
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*/
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LEAF(__syscall, 0)
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bis a0, a0, v0 # Syscall number -> v0
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bis a1, a1, a0 # arg1-arg5 -> a0-a4
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bis a2, a2, a1
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bis a3, a3, a2
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bis a4, a4, a3
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bis a5, a5, a4
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call_pal PAL_callsys # Invoke system call
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bne a3, error
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ret
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error: br gp, 2f
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2: ldgp gp, 0(gp)
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jmp zero, syscall_error
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weak_alias(__syscall, syscall)
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