![Christoph Hellwig](/assets/img/avatar_default.png)
Add a generic implementation of the ipc demultiplexer syscall. Except for s390 and sparc64 all implementations of the sys_ipc are nearly identical. There are slight differences in the types of the parameters, where mips and powerpc as the only 64-bit architectures with sys_ipc use unsigned long for the "third" argument as it gets casted to a pointer later, while it traditionally is an "int" like most other paramters. frv goes even further and uses unsigned long for all parameters execept for "ptr" which is a pointer type everywhere. The change from int to unsigned long for "third" and back to "int" for the others on frv should be fine due to the in-register calling conventions for syscalls (we already had a similar issue with the generic sys_ptrace), but I'd prefer to have the arch maintainers looks over this in details. Except for that h8300, m68k and m68knommu lack an impplementation of the semtimedop sub call which this patch adds, and various architectures have gets used - at least on i386 it seems superflous as the compat code on x86-64 and ia64 doesn't even bother to implement it. [akpm@linux-foundation.org: add sys_ipc to sys_ni.c] Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Reviewed-by: H. Peter Anvin <hpa@zytor.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: James Morris <jmorris@namei.org> Cc: Andreas Schwab <schwab@linux-m68k.org> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
454 lines
11 KiB
C
454 lines
11 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2001 MIPS Technologies, Inc.
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*/
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/linkage.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/smp.h>
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#include <linux/mman.h>
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#include <linux/ptrace.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/syscalls.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/utsname.h>
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#include <linux/unistd.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/compiler.h>
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#include <linux/module.h>
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#include <linux/ipc.h>
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#include <linux/uaccess.h>
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#include <asm/asm.h>
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#include <asm/branch.h>
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#include <asm/cachectl.h>
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#include <asm/cacheflush.h>
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#include <asm/asm-offsets.h>
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#include <asm/signal.h>
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#include <asm/sim.h>
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#include <asm/shmparam.h>
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#include <asm/sysmips.h>
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#include <asm/uaccess.h>
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/*
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* For historic reasons the pipe(2) syscall on MIPS has an unusual calling
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* convention. It returns results in registers $v0 / $v1 which means there
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* is no need for it to do verify the validity of a userspace pointer
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* argument. Historically that used to be expensive in Linux. These days
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* the performance advantage is negligible.
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*/
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asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
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{
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int fd[2];
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int error, res;
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error = do_pipe_flags(fd, 0);
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if (error) {
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res = error;
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goto out;
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}
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regs.regs[3] = fd[1];
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res = fd[0];
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out:
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return res;
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}
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unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
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EXPORT_SYMBOL(shm_align_mask);
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#define COLOUR_ALIGN(addr,pgoff) \
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((((addr) + shm_align_mask) & ~shm_align_mask) + \
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(((pgoff) << PAGE_SHIFT) & shm_align_mask))
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct vm_area_struct * vmm;
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int do_color_align;
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unsigned long task_size;
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task_size = STACK_TOP;
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if (len > task_size)
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return -ENOMEM;
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if (flags & MAP_FIXED) {
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/* Even MAP_FIXED mappings must reside within task_size. */
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if (task_size - len < addr)
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return -EINVAL;
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/*
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* We do not accept a shared mapping if it would violate
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* cache aliasing constraints.
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*/
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if ((flags & MAP_SHARED) &&
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((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
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return -EINVAL;
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return addr;
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}
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do_color_align = 0;
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if (filp || (flags & MAP_SHARED))
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do_color_align = 1;
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if (addr) {
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if (do_color_align)
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addr = COLOUR_ALIGN(addr, pgoff);
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else
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addr = PAGE_ALIGN(addr);
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vmm = find_vma(current->mm, addr);
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if (task_size - len >= addr &&
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(!vmm || addr + len <= vmm->vm_start))
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return addr;
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}
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addr = TASK_UNMAPPED_BASE;
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if (do_color_align)
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addr = COLOUR_ALIGN(addr, pgoff);
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else
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addr = PAGE_ALIGN(addr);
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for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
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/* At this point: (!vmm || addr < vmm->vm_end). */
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if (task_size - len < addr)
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return -ENOMEM;
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if (!vmm || addr + len <= vmm->vm_start)
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return addr;
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addr = vmm->vm_end;
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if (do_color_align)
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addr = COLOUR_ALIGN(addr, pgoff);
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}
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}
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SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
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unsigned long, prot, unsigned long, flags, unsigned long,
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fd, off_t, offset)
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{
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unsigned long result;
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result = -EINVAL;
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if (offset & ~PAGE_MASK)
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goto out;
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result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
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out:
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return result;
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}
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SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
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unsigned long, prot, unsigned long, flags, unsigned long, fd,
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unsigned long, pgoff)
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{
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if (pgoff & (~PAGE_MASK >> 12))
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return -EINVAL;
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return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
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}
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save_static_function(sys_fork);
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static int __used noinline
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_sys_fork(nabi_no_regargs struct pt_regs regs)
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{
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return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL);
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}
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save_static_function(sys_clone);
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static int __used noinline
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_sys_clone(nabi_no_regargs struct pt_regs regs)
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{
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unsigned long clone_flags;
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unsigned long newsp;
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int __user *parent_tidptr, *child_tidptr;
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clone_flags = regs.regs[4];
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newsp = regs.regs[5];
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if (!newsp)
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newsp = regs.regs[29];
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parent_tidptr = (int __user *) regs.regs[6];
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#ifdef CONFIG_32BIT
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/* We need to fetch the fifth argument off the stack. */
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child_tidptr = NULL;
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if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) {
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int __user *__user *usp = (int __user *__user *) regs.regs[29];
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if (regs.regs[2] == __NR_syscall) {
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if (get_user (child_tidptr, &usp[5]))
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return -EFAULT;
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}
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else if (get_user (child_tidptr, &usp[4]))
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return -EFAULT;
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}
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#else
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child_tidptr = (int __user *) regs.regs[8];
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#endif
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return do_fork(clone_flags, newsp, ®s, 0,
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parent_tidptr, child_tidptr);
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}
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/*
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* sys_execve() executes a new program.
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*/
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asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
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{
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int error;
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char * filename;
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filename = getname((char __user *) (long)regs.regs[4]);
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error = PTR_ERR(filename);
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if (IS_ERR(filename))
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goto out;
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error = do_execve(filename, (char __user *__user *) (long)regs.regs[5],
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(char __user *__user *) (long)regs.regs[6], ®s);
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putname(filename);
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out:
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return error;
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}
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/*
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* Compacrapability ...
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*/
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SYSCALL_DEFINE1(uname, struct old_utsname __user *, name)
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{
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if (name && !copy_to_user(name, utsname(), sizeof (*name)))
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return 0;
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return -EFAULT;
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}
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/*
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* Compacrapability ...
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*/
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SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name)
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{
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int error;
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if (!name)
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return -EFAULT;
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if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
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return -EFAULT;
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error = __copy_to_user(&name->sysname, &utsname()->sysname,
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__OLD_UTS_LEN);
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error -= __put_user(0, name->sysname + __OLD_UTS_LEN);
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error -= __copy_to_user(&name->nodename, &utsname()->nodename,
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__OLD_UTS_LEN);
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error -= __put_user(0, name->nodename + __OLD_UTS_LEN);
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error -= __copy_to_user(&name->release, &utsname()->release,
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__OLD_UTS_LEN);
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error -= __put_user(0, name->release + __OLD_UTS_LEN);
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error -= __copy_to_user(&name->version, &utsname()->version,
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__OLD_UTS_LEN);
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error -= __put_user(0, name->version + __OLD_UTS_LEN);
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error -= __copy_to_user(&name->machine, &utsname()->machine,
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__OLD_UTS_LEN);
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error = __put_user(0, name->machine + __OLD_UTS_LEN);
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error = error ? -EFAULT : 0;
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return error;
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}
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SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
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{
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struct thread_info *ti = task_thread_info(current);
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ti->tp_value = addr;
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if (cpu_has_userlocal)
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write_c0_userlocal(addr);
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return 0;
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}
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static inline int mips_atomic_set(struct pt_regs *regs,
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unsigned long addr, unsigned long new)
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{
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unsigned long old, tmp;
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unsigned int err;
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if (unlikely(addr & 3))
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return -EINVAL;
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if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
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return -EINVAL;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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__asm__ __volatile__ (
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" .set mips3 \n"
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" li %[err], 0 \n"
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"1: ll %[old], (%[addr]) \n"
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" move %[tmp], %[new] \n"
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"2: sc %[tmp], (%[addr]) \n"
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" beqzl %[tmp], 1b \n"
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"3: \n"
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" .section .fixup,\"ax\" \n"
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"4: li %[err], %[efault] \n"
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" j 3b \n"
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" .previous \n"
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" .section __ex_table,\"a\" \n"
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" "STR(PTR)" 1b, 4b \n"
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" "STR(PTR)" 2b, 4b \n"
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" .previous \n"
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" .set mips0 \n"
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: [old] "=&r" (old),
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[err] "=&r" (err),
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[tmp] "=&r" (tmp)
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: [addr] "r" (addr),
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[new] "r" (new),
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[efault] "i" (-EFAULT)
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: "memory");
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} else if (cpu_has_llsc) {
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__asm__ __volatile__ (
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" .set mips3 \n"
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" li %[err], 0 \n"
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"1: ll %[old], (%[addr]) \n"
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" move %[tmp], %[new] \n"
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"2: sc %[tmp], (%[addr]) \n"
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" bnez %[tmp], 4f \n"
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"3: \n"
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" .subsection 2 \n"
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"4: b 1b \n"
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" .previous \n"
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" \n"
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" .section .fixup,\"ax\" \n"
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"5: li %[err], %[efault] \n"
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" j 3b \n"
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" .previous \n"
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" .section __ex_table,\"a\" \n"
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" "STR(PTR)" 1b, 5b \n"
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" "STR(PTR)" 2b, 5b \n"
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" .previous \n"
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" .set mips0 \n"
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: [old] "=&r" (old),
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[err] "=&r" (err),
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[tmp] "=&r" (tmp)
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: [addr] "r" (addr),
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[new] "r" (new),
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[efault] "i" (-EFAULT)
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: "memory");
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} else {
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do {
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preempt_disable();
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ll_bit = 1;
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ll_task = current;
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preempt_enable();
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err = __get_user(old, (unsigned int *) addr);
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err |= __put_user(new, (unsigned int *) addr);
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if (err)
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break;
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rmb();
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} while (!ll_bit);
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}
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if (unlikely(err))
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return err;
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regs->regs[2] = old;
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regs->regs[7] = 0; /* No error */
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/*
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* Don't let your children do this ...
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*/
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__asm__ __volatile__(
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" move $29, %0 \n"
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" j syscall_exit \n"
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: /* no outputs */
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: "r" (regs));
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/* unreached. Honestly. */
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while (1);
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}
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save_static_function(sys_sysmips);
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static int __used noinline
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_sys_sysmips(nabi_no_regargs struct pt_regs regs)
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{
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long cmd, arg1, arg2, arg3;
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cmd = regs.regs[4];
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arg1 = regs.regs[5];
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arg2 = regs.regs[6];
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arg3 = regs.regs[7];
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switch (cmd) {
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case MIPS_ATOMIC_SET:
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return mips_atomic_set(®s, arg1, arg2);
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case MIPS_FIXADE:
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if (arg1 & ~3)
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return -EINVAL;
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if (arg1 & 1)
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set_thread_flag(TIF_FIXADE);
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else
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clear_thread_flag(TIF_FIXADE);
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if (arg1 & 2)
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set_thread_flag(TIF_LOGADE);
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else
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clear_thread_flag(TIF_FIXADE);
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return 0;
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case FLUSH_CACHE:
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__flush_cache_all();
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return 0;
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}
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return -EINVAL;
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}
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/*
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* No implemented yet ...
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*/
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SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
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{
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return -ENOSYS;
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}
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/*
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* If we ever come here the user sp is bad. Zap the process right away.
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* Due to the bad stack signaling wouldn't work.
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*/
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asmlinkage void bad_stack(void)
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{
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do_exit(SIGSEGV);
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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 unsigned long __a0 asm("$4") = (unsigned long) filename;
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register unsigned long __a1 asm("$5") = (unsigned long) argv;
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register unsigned long __a2 asm("$6") = (unsigned long) envp;
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register unsigned long __a3 asm("$7");
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unsigned long __v0;
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__asm__ volatile (" \n"
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" .set noreorder \n"
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" li $2, %5 # __NR_execve \n"
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" syscall \n"
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" move %0, $2 \n"
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" .set reorder \n"
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: "=&r" (__v0), "=r" (__a3)
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: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
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: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
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"memory");
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if (__a3 == 0)
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return __v0;
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return -__v0;
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}
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