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2003-03-27 Philip Blundell <philb@gnu.org>

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* sysdeps/unix/sysv/linux/kernel-features.h
	(__ASSUME_VFORK_SYSCALL): Define for kernel 2.4 on arm.
	* sysdeps/unix/sysv/linux/arm/vfork.S: Elide compatibility code
	when __ASSUME_VFORK_SYSCALL is defined.
	* sysdeps/unix/sysv/linux/arm/mmap64.S: Likewise for
	__ASSUME_MMAP2_SYSCALL.
	* sysdeps/unix/sysv/linux/arm/sigaction.c: Likewise for
	__ASSUME_REALTIME_SIGNALS.
This commit is contained in:
Roland McGrath
2003-03-27 02:45:47 +00:00
parent 18ef464b2f
commit 8eed661a56
4 changed files with 35 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
sysdeps/unix/sysv/linux/arm/mmap64.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2000 Free Software Foundation, Inc.
/* Copyright (C) 2000, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -21,6 +21,8 @@
#define EINVAL 22
#define ENOSYS 38
#include "kernel-features.h"
/* The mmap2 system call takes six arguments, all in registers. */
.text
ENTRY (__mmap64)
@ -39,6 +41,10 @@ ENTRY (__mmap64)
swi SYS_ify (mmap2)
cmn r0, $4096
LOADREGS(ccfd, sp!, {r4, r5, pc})
# ifdef __ASSUME_MMAP2_SYSCALL
ldmfd sp!, {r4, r5, lr}
b PLTJMP(syscall_error)
# else
cmn r0, $ENOSYS
ldmnefd sp!, {r4, r5, lr}
bne PLTJMP(syscall_error)
@ -49,6 +55,7 @@ ENTRY (__mmap64)
teq r5, $0
ldmeqfd sp!, {r4, r5, lr}
beq PLTJMP(__mmap)
# endif
.Linval:
mov r0, $-EINVAL
ldmfd sp!, {r4, r5, lr}

13
sysdeps/unix/sysv/linux/arm/sigaction.c
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@ -22,6 +22,7 @@
#include <sysdep.h>
#include <sys/syscall.h>
#include <kernel-features.h>
/* The difference here is that the sigaction structure used in the
kernel is not the same as we use in the libc. Therefore we must
@ -60,15 +61,21 @@ __libc_sigaction (sig, act, oact)
const struct sigaction *act;
struct sigaction *oact;
{
#ifndef __ASSUME_REALTIME_SIGNALS
struct old_kernel_sigaction k_sigact, k_osigact;
#endif
int result;
#ifdef __NR_rt_sigaction
/* First try the RT signals. */
# ifndef __ASSUME_REALTIME_SIGNALS
if (!__libc_missing_rt_sigs)
# endif
{
struct kernel_sigaction kact, koact;
# ifndef __ASSUME_REALTIME_SIGNALS
int saved_errno = errno;
# endif
if (act)
{
@ -99,7 +106,9 @@ __libc_sigaction (sig, act, oact)
act ? __ptrvalue (&kact) : NULL,
oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
# ifndef __ASSUME_REALTIME_SIGNALS
if (result >= 0 || errno != ENOSYS)
# endif
{
if (oact && result >= 0)
{
@ -113,11 +122,14 @@ __libc_sigaction (sig, act, oact)
return result;
}
# ifndef __ASSUME_REALTIME_SIGNALS
__set_errno (saved_errno);
__libc_missing_rt_sigs = 1;
# endif
}
#endif
#ifndef __ASSUME_REALTIME_SIGNALS
if (act)
{
k_sigact.k_sa_handler = act->sa_handler;
@ -147,6 +159,7 @@ __libc_sigaction (sig, act, oact)
# endif
}
return result;
#endif
}
libc_hidden_def (__libc_sigaction)

9
sysdeps/unix/sysv/linux/arm/vfork.S
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@ -1,4 +1,4 @@
/* Copyright (C) 1999, 2002 Free Software Foundation, Inc.
/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Philip Blundell <philb@gnu.org>.
@ -20,6 +20,7 @@
#include <sysdep.h>
#define _ERRNO_H 1
#include <bits/errno.h>
#include <kernel-features.h>
/* Clone the calling process, but without copying the whole address space.
The calling process is suspended until the new process exits or is
@ -33,17 +34,23 @@ ENTRY (__vfork)
cmn a1, #4096
RETINSTR(movcc, pc, lr)
# ifdef __ASSUME_VFORK_SYSCALL
b PLTJMP(C_SYMBOL_NAME(__syscall_error))
# else
/* Check if vfork syscall is known at all. */
ldr a2, =-ENOSYS
teq a1, a2
bne PLTJMP(C_SYMBOL_NAME(__syscall_error))
# endif
#endif
#ifndef __ASSUME_VFORK_SYSCALL
/* If we don't have vfork, fork is close enough. */
swi __NR_fork
cmn a1, #4096
RETINSTR(movcc, pc, lr)
b PLTJMP(C_SYMBOL_NAME(__syscall_error))
#endif
PSEUDO_END (__vfork)
libc_hidden_def (__vfork)

4
sysdeps/unix/sysv/linux/kernel-features.h
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@ -229,8 +229,8 @@
# define __ASSUME_SET_THREAD_AREA_SYSCALL 1
#endif
/* The vfork syscall on x86 was definitely available in 2.4. */
#if __LINUX_KERNEL_VERSION >= 132097 && defined __i386__
/* The vfork syscall on x86 and arm was definitely available in 2.4. */
#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
# define __ASSUME_VFORK_SYSCALL 1
#endif