diff options
| -rw-r--r-- | libc/sysdeps/linux/arm/Makefile | 4 | ||||
| -rw-r--r-- | libc/sysdeps/linux/arm/vfork.S | 73 |
2 files changed, 75 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/arm/Makefile b/libc/sysdeps/linux/arm/Makefile index 4b23adae7..c3a57ccd3 100644 --- a/libc/sysdeps/linux/arm/Makefile +++ b/libc/sysdeps/linux/arm/Makefile @@ -35,10 +35,10 @@ endif CRT0_OBJ=$(patsubst %.S,%.o, $(CRT0)) -SSRC=longjmp.S setjmp.S +SSRC=longjmp.S setjmp.S vfork.S SOBJS=$(patsubst %.S,%.o, $(SSRC)) -CSRC=fork.c vfork.c +CSRC=fork.c ptrace.c COBJS=$(patsubst %.c,%.o, $(CSRC)) OBJS=$(SOBJS) $(MOBJ) $(COBJS) diff --git a/libc/sysdeps/linux/arm/vfork.S b/libc/sysdeps/linux/arm/vfork.S new file mode 100644 index 000000000..845a222ac --- /dev/null +++ b/libc/sysdeps/linux/arm/vfork.S @@ -0,0 +1,73 @@ +/* vi: set sw=4 ts=4: */ +/* + * fork for uClibc + * + * Copyright (C) 2000 by Lineo, inc. Written by Erik Andersen + * <andersen@lineo.com>, <andersee@debian.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU Library General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program 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 Library General Public License + * for more details. + * + * You should have received a copy of the GNU Library General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/errno.h> +#include <asm/unistd.h> + + +.global errno; + + +.text +.global vfork; +.type vfork,%function +.align 4; \ + + + +vfork: + +#ifdef __SYS_vfork + swi __NR_vfork + cmn r0, #4096 + movcc pc, lr + + /* Check if vfork even exists. */ + ldr r1, =-ENOSYS + teq r0, r1 + bne __syscall_error +#endif + + /* If we don't have vfork, use fork. */ + swi __NR_fork + cmn r0, #4096 + + /* Syscal worked. Return to child/parent */ + movcc pc, lr + +__syscall_error: + + /* Looks like the syscall choked -- set errno */ + ldr r3, .L4 + /* Calculate the - of the syscall result, in case we need it */ + rsb r2, r0, $0 + + /* errno = -result */ + str r2, [r9,r3] + + /* return -1 */ + mvn r0, $0 + mov pc, lr + +.L4: .word errno + |