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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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* 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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#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/smp.h>
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#include <linux/ptrace.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/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/ipc.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/elf.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/shmparam.h>
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#include <asm/sysmips.h>
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#include <asm/uaccess.h>
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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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asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
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error = do_pipe_flags(fd, 0);
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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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if (offset & ~PAGE_MASK)
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result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
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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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if (pgoff & (~PAGE_MASK >> 12))
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return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
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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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return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL);
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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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unsigned long clone_flags;
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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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newsp = regs.regs[29];
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parent_tidptr = (int __user *) regs.regs[6];
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/* We need to fetch the fifth argument off the stack. */
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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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else if (get_user (child_tidptr, &usp[4]))
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child_tidptr = (int __user *) regs.regs[8];
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return do_fork(clone_flags, newsp, ®s, 0,
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parent_tidptr, child_tidptr);
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* sys_execve() executes a new program.
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asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
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filename = getname((const 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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error = do_execve(filename,
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(const char __user *const __user *) (long)regs.regs[5],
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(const char __user *const __user *) (long)regs.regs[6],
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SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
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struct thread_info *ti = task_thread_info(current);
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if (cpu_has_userlocal)
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write_c0_userlocal(addr);
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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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unsigned long old, tmp;
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if (unlikely(addr & 3))
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if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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__asm__ __volatile__ (
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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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" .section .fixup,\"ax\" \n"
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"4: li %[err], %[efault] \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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[efault] "i" (-EFAULT)
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} else if (cpu_has_llsc) {
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__asm__ __volatile__ (
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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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" .section .fixup,\"ax\" \n"
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"5: li %[err], %[efault] \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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[efault] "i" (-EFAULT)
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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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regs->regs[7] = 0; /* No error */
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* Don't let your children do this ...
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__asm__ __volatile__(
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/* unreached. Honestly. */
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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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long cmd, arg1, arg2;
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case MIPS_ATOMIC_SET:
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return mips_atomic_set(®s, arg1, arg2);
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set_thread_flag(TIF_FIXADE);
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clear_thread_flag(TIF_FIXADE);
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set_thread_flag(TIF_LOGADE);
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clear_thread_flag(TIF_LOGADE);
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* No implemented yet ...
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SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
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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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asmlinkage void bad_stack(void)
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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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int kernel_execve(const char *filename,
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const char *const argv[],
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const char *const envp[])
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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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__asm__ volatile (" \n"
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" li $2, %5 # __NR_execve \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",