![Arnd Bergmann](/assets/img/avatar_default.png)
This adds the new kernel_execve function on all architectures that were using _syscall3() to implement execve. The implementation uses code from the _syscall3 macros provided in the unistd.h header file. I don't have cross-compilers for any of these architectures, so the patch is untested with the exception of i386. Most architectures can probably implement this in a nicer way in assembly or by combining it with the sys_execve implementation itself, but this should do it for now. [bunk@stusta.de: m68knommu build fix] [markh@osdl.org: build fix] [bero@arklinux.org: build fix] [ralf@linux-mips.org: mips fix] [schwidefsky@de.ibm.com: s390 fix] Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Andi Kleen <ak@muc.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Hirokazu Takata <takata.hirokazu@renesas.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Chris Zankel <chris@zankel.net> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Bernhard Rosenkraenzer <bero@arklinux.org> Signed-off-by: Mark Haverkamp <markh@osdl.org> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
217 lines
5.1 KiB
C
217 lines
5.1 KiB
C
/*
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* arch/v850/kernel/syscalls.c -- Various system-call definitions not
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* defined in machine-independent code
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*
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* Copyright (C) 2001,02 NEC Corporation
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* Copyright (C) 2001,02 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* This file was derived the ppc version, arch/ppc/kernel/syscalls.c
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* ... which was derived from "arch/i386/kernel/sys_i386.c" by Gary Thomas;
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* modified by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras (paulus@cs.anu.edu.au).
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*/
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/syscalls.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/mman.h>
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#include <linux/sys.h>
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#include <linux/ipc.h>
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#include <linux/utsname.h>
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#include <linux/file.h>
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#include <asm/uaccess.h>
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#include <asm/ipc.h>
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#include <asm/semaphore.h>
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#include <asm/unistd.h>
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/*
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* sys_ipc() is the de-multiplexer for the SysV IPC calls..
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*
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* This is really horribly ugly.
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*/
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int
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sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
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{
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int version, ret;
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version = call >> 16; /* hack for backward compatibility */
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call &= 0xffff;
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ret = -EINVAL;
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switch (call) {
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case SEMOP:
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ret = sys_semop (first, (struct sembuf *)ptr, second);
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break;
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case SEMGET:
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ret = sys_semget (first, second, third);
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break;
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case SEMCTL:
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{
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union semun fourth;
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if (!ptr)
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break;
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if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
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|| (ret = get_user(fourth.__pad, (void **)ptr)))
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break;
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ret = sys_semctl (first, second, third, fourth);
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break;
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}
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case MSGSND:
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ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third);
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break;
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case MSGRCV:
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switch (version) {
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case 0: {
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struct ipc_kludge tmp;
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if (!ptr)
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break;
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if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
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|| (ret = copy_from_user(&tmp,
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(struct ipc_kludge *) ptr,
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sizeof (tmp))))
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break;
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ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
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third);
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break;
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}
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default:
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ret = sys_msgrcv (first, (struct msgbuf *) ptr,
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second, fifth, third);
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break;
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}
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break;
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case MSGGET:
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ret = sys_msgget ((key_t) first, second);
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break;
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case MSGCTL:
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ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
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break;
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case SHMAT:
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switch (version) {
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default: {
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ulong raddr;
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if ((ret = access_ok(VERIFY_WRITE, (ulong*) third,
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sizeof(ulong)) ? 0 : -EFAULT))
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break;
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ret = do_shmat (first, (char *) ptr, second, &raddr);
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if (ret)
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break;
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ret = put_user (raddr, (ulong *) third);
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break;
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}
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case 1: /* iBCS2 emulator entry point */
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if (!segment_eq(get_fs(), get_ds()))
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break;
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ret = do_shmat (first, (char *) ptr, second,
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(ulong *) third);
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break;
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}
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break;
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case SHMDT:
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ret = sys_shmdt ((char *)ptr);
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break;
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case SHMGET:
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ret = sys_shmget (first, second, third);
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break;
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case SHMCTL:
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ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
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break;
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}
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return ret;
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}
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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way unix traditionally does this, though.
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*/
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int sys_pipe (int *fildes)
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{
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int fd[2];
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int error;
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error = do_pipe (fd);
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if (!error) {
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if (copy_to_user (fildes, fd, 2*sizeof (int)))
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error = -EFAULT;
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}
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return error;
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}
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static inline unsigned long
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do_mmap2 (unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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struct file * file = NULL;
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int ret = -EBADF;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (! (flags & MAP_ANONYMOUS)) {
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if (!(file = fget (fd)))
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goto out;
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}
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down_write (¤t->mm->mmap_sem);
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ret = do_mmap_pgoff (file, addr, len, prot, flags, pgoff);
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up_write (¤t->mm->mmap_sem);
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if (file)
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fput (file);
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out:
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return ret;
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}
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unsigned long sys_mmap2 (unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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return do_mmap2 (addr, len, prot, flags, fd, pgoff);
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}
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unsigned long sys_mmap (unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, off_t offset)
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{
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int err = -EINVAL;
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if (offset & ~PAGE_MASK)
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goto out;
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err = do_mmap2 (addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
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out:
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return err;
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}
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/*
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* Do a system call from kernel instead of calling sys_execve so we
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* end up with proper pt_regs.
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*/
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int kernel_execve(const char *filename, char *const argv[], char *const envp[])
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{
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register char *__a __asm__ ("r6") = filename;
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register void *__b __asm__ ("r7") = argv;
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register void *__c __asm__ ("r8") = envp;
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register unsigned long __syscall __asm__ ("r12") = __NR_execve;
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register unsigned long __ret __asm__ ("r10");
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__asm__ __volatile__ ("trap 0"
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: "=r" (__ret), "=r" (__syscall)
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: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
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: "r1", "r5", "r11", "r13", "r14",
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"r15", "r16", "r17", "r18", "r19");
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return __ret;
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}
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