diff options
| -rw-r--r-- | lib/libc/i386/sys/Makefile.inc | 4 | ||||
| -rw-r--r-- | lib/libc/i386/sys/getcontext.S | 50 |
2 files changed, 52 insertions, 2 deletions
diff --git a/lib/libc/i386/sys/Makefile.inc b/lib/libc/i386/sys/Makefile.inc index ad76609..5adee65 100644 --- a/lib/libc/i386/sys/Makefile.inc +++ b/lib/libc/i386/sys/Makefile.inc @@ -4,8 +4,8 @@ SRCS+= i386_clr_watch.c i386_get_ioperm.c i386_get_ldt.c i386_set_ioperm.c \ i386_set_ldt.c i386_set_watch.c i386_vm86.c -MDASM= Ovfork.S brk.S cerror.S exect.S pipe.S ptrace.S reboot.S sbrk.S \ - setlogin.S sigreturn.S syscall.S +MDASM= Ovfork.S brk.S cerror.S exect.S getcontext.S pipe.S ptrace.S \ + reboot.S sbrk.S setlogin.S sigreturn.S syscall.S # Don't generate default code for these syscalls: NOASM= break.o exit.o ftruncate.o getdomainname.o getlogin.o \ diff --git a/lib/libc/i386/sys/getcontext.S b/lib/libc/i386/sys/getcontext.S new file mode 100644 index 0000000..b66ad30 --- /dev/null +++ b/lib/libc/i386/sys/getcontext.S @@ -0,0 +1,50 @@ +/*- + * Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); + +#include <SYS.h> + +/* + * This has to be magic to handle the multiple returns. + * Otherwise, the setcontext() syscall will return here and we'll + * pop off the return address and go to the *setcontext* call. + */ + .weak _getcontext + .set _getcontext,__sys_getcontext + .weak getcontext + .set getcontext,__sys_getcontext +ENTRY(__sys_getcontext) + movl (%esp),%ecx /* save getcontext return address */ + mov $SYS_getcontext,%eax + KERNCALL + jb 1f + addl $4,%esp /* remove stale (setcontext) return address */ + jmp *%ecx /* restore return address */ +1: + PIC_PROLOGUE + jmp PIC_PLT(HIDENAME(cerror)) |
