![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>
302 lines
7.4 KiB
C
302 lines
7.4 KiB
C
/* linux/arch/sparc/kernel/sys_sparc.c
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/sparc
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/file.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/syscalls.h>
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#include <linux/mman.h>
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#include <linux/utsname.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/ipc.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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/* #define DEBUG_UNIMP_SYSCALL */
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/* XXX Make this per-binary type, this way we can detect the type of
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* XXX a binary. Every Sparc executable calls this very early on.
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*/
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asmlinkage unsigned long sys_getpagesize(void)
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{
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return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
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}
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#define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 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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if (flags & MAP_FIXED) {
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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)) & (SHMLBA - 1)))
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return -EINVAL;
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return addr;
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}
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/* See asm-sparc/uaccess.h */
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if (len > TASK_SIZE - PAGE_SIZE)
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return -ENOMEM;
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if (ARCH_SUN4C && len > 0x20000000)
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return -ENOMEM;
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if (!addr)
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addr = TASK_UNMAPPED_BASE;
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if (flags & MAP_SHARED)
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addr = COLOUR_ALIGN(addr);
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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 (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
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addr = PAGE_OFFSET;
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vmm = find_vma(current->mm, PAGE_OFFSET);
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}
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if (TASK_SIZE - PAGE_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 (flags & MAP_SHARED)
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addr = COLOUR_ALIGN(addr);
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}
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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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asmlinkage int sparc_pipe(struct pt_regs *regs)
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{
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int fd[2];
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int error;
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error = do_pipe_flags(fd, 0);
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if (error)
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goto out;
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regs->u_regs[UREG_I1] = fd[1];
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error = fd[0];
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out:
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return error;
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}
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int sparc_mmap_check(unsigned long addr, unsigned long len)
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{
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if (ARCH_SUN4C &&
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(len > 0x20000000 ||
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(addr < 0xe0000000 && addr + len > 0x20000000)))
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return -EINVAL;
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/* See asm-sparc/uaccess.h */
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if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
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return -EINVAL;
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return 0;
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}
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/* Linux version of mmap */
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asmlinkage unsigned long sys_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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/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
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we have. */
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return sys_mmap_pgoff(addr, len, prot, flags, fd,
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pgoff >> (PAGE_SHIFT - 12));
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}
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asmlinkage unsigned long sys_mmap(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 off)
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{
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/* no alignment check? */
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return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
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}
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long sparc_remap_file_pages(unsigned long start, unsigned long size,
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unsigned long prot, unsigned long pgoff,
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unsigned long flags)
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{
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/* This works on an existing mmap so we don't need to validate
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* the range as that was done at the original mmap call.
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*/
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return sys_remap_file_pages(start, size, prot,
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(pgoff >> (PAGE_SHIFT - 12)), flags);
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}
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/* we come to here via sys_nis_syscall so it can setup the regs argument */
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asmlinkage unsigned long
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c_sys_nis_syscall (struct pt_regs *regs)
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{
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static int count = 0;
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if (count++ > 5)
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return -ENOSYS;
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printk ("%s[%d]: Unimplemented SPARC system call %d\n",
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current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
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#ifdef DEBUG_UNIMP_SYSCALL
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show_regs (regs);
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#endif
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return -ENOSYS;
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}
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/* #define DEBUG_SPARC_BREAKPOINT */
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asmlinkage void
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sparc_breakpoint (struct pt_regs *regs)
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{
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siginfo_t info;
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lock_kernel();
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#ifdef DEBUG_SPARC_BREAKPOINT
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printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
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#endif
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info.si_signo = SIGTRAP;
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info.si_errno = 0;
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info.si_code = TRAP_BRKPT;
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info.si_addr = (void __user *)regs->pc;
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info.si_trapno = 0;
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force_sig_info(SIGTRAP, &info, current);
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#ifdef DEBUG_SPARC_BREAKPOINT
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printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
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#endif
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unlock_kernel();
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}
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asmlinkage int
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sparc_sigaction (int sig, const struct old_sigaction __user *act,
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struct old_sigaction __user *oact)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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WARN_ON_ONCE(sig >= 0);
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sig = -sig;
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if (act) {
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unsigned long mask;
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if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
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__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
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__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
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return -EFAULT;
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__get_user(new_ka.sa.sa_flags, &act->sa_flags);
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__get_user(mask, &act->sa_mask);
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siginitset(&new_ka.sa.sa_mask, mask);
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new_ka.ka_restorer = NULL;
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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/* In the clone() case we could copy half consistent
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* state to the user, however this could sleep and
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* deadlock us if we held the signal lock on SMP. So for
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* now I take the easy way out and do no locking.
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*/
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if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
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__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
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__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
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return -EFAULT;
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__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
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}
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return ret;
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}
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asmlinkage long
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sys_rt_sigaction(int sig,
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const struct sigaction __user *act,
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struct sigaction __user *oact,
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void __user *restorer,
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size_t sigsetsize)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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/* XXX: Don't preclude handling different sized sigset_t's. */
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if (sigsetsize != sizeof(sigset_t))
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return -EINVAL;
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if (act) {
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new_ka.ka_restorer = restorer;
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if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
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return -EFAULT;
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
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return -EFAULT;
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}
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return ret;
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}
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asmlinkage int sys_getdomainname(char __user *name, int len)
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{
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int nlen, err;
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if (len < 0)
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return -EINVAL;
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down_read(&uts_sem);
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nlen = strlen(utsname()->domainname) + 1;
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err = -EINVAL;
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if (nlen > len)
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goto out;
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err = -EFAULT;
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if (!copy_to_user(name, utsname()->domainname, nlen))
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err = 0;
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out:
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up_read(&uts_sem);
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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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long __res;
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register long __g1 __asm__ ("g1") = __NR_execve;
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register long __o0 __asm__ ("o0") = (long)(filename);
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register long __o1 __asm__ ("o1") = (long)(argv);
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register long __o2 __asm__ ("o2") = (long)(envp);
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asm volatile ("t 0x10\n\t"
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"bcc 1f\n\t"
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"mov %%o0, %0\n\t"
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"sub %%g0, %%o0, %0\n\t"
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"1:\n\t"
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: "=r" (__res), "=&r" (__o0)
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: "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
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: "cc");
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return __res;
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}
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