431 lines
11 KiB
C
431 lines
11 KiB
C
/*
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* Conversion between 32-bit and 64-bit native system calls.
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*
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* Copyright (C) 2000 Silicon Graphics, Inc.
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* Written by Ulf Carlsson (ulfc@engr.sgi.com)
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* sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
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*/
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#include <linux/compiler.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/smp_lock.h>
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#include <linux/highuid.h>
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#include <linux/resource.h>
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#include <linux/highmem.h>
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#include <linux/time.h>
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#include <linux/times.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/filter.h>
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#include <linux/shm.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/icmpv6.h>
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#include <linux/syscalls.h>
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#include <linux/sysctl.h>
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#include <linux/utime.h>
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#include <linux/utsname.h>
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#include <linux/personality.h>
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#include <linux/dnotify.h>
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#include <linux/module.h>
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#include <linux/binfmts.h>
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#include <linux/security.h>
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#include <linux/compat.h>
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#include <linux/vfs.h>
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#include <linux/ipc.h>
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#include <net/sock.h>
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#include <net/scm.h>
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#include <asm/compat-signal.h>
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#include <asm/sim.h>
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#include <asm/uaccess.h>
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#include <asm/mmu_context.h>
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#include <asm/mman.h>
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/* Use this to get at 32-bit user passed pointers. */
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/* A() macro should be used for places where you e.g.
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have some internal variable u32 and just want to get
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rid of a compiler warning. AA() has to be used in
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places where you want to convert a function argument
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to 32bit pointer or when you e.g. access pt_regs
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structure and want to consider 32bit registers only.
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*/
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#define A(__x) ((unsigned long)(__x))
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#define AA(__x) ((unsigned long)((int)__x))
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#ifdef __MIPSEB__
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#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
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#endif
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#ifdef __MIPSEL__
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#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
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#endif
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SYSCALL_DEFINE6(32_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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struct file * file = NULL;
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unsigned long error;
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error = -EINVAL;
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if (pgoff & (~PAGE_MASK >> 12))
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goto out;
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pgoff >>= PAGE_SHIFT-12;
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if (!(flags & MAP_ANONYMOUS)) {
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error = -EBADF;
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file = fget(fd);
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if (!file)
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goto out;
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}
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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down_write(¤t->mm->mmap_sem);
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error = 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 error;
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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 sys32_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(compat_ptr(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 = compat_do_execve(filename, compat_ptr(regs.regs[5]),
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compat_ptr(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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#define RLIM_INFINITY32 0x7fffffff
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#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
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struct rlimit32 {
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int rlim_cur;
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int rlim_max;
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};
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SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
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unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
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{
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return sys_truncate(path, merge_64(a2, a3));
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}
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SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
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unsigned long, a2, unsigned long, a3)
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{
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return sys_ftruncate(fd, merge_64(a2, a3));
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}
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SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
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unsigned int, offset_low, loff_t __user *, result,
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unsigned int, origin)
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{
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return sys_llseek(fd, offset_high, offset_low, result, origin);
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}
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/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
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lseek back to original location. They fail just like lseek does on
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non-seekable files. */
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SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
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unsigned long, unused, unsigned long, a4, unsigned long, a5)
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{
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return sys_pread64(fd, buf, count, merge_64(a4, a5));
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}
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SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
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size_t, count, u32, unused, u64, a4, u64, a5)
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{
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return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
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}
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SYSCALL_DEFINE2(32_sched_rr_get_interval, compat_pid_t, pid,
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struct compat_timespec __user *, interval)
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{
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struct timespec t;
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int ret;
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mm_segment_t old_fs = get_fs();
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set_fs(KERNEL_DS);
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ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
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set_fs(old_fs);
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if (put_user (t.tv_sec, &interval->tv_sec) ||
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__put_user(t.tv_nsec, &interval->tv_nsec))
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return -EFAULT;
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return ret;
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}
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#ifdef CONFIG_SYSVIPC
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SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
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unsigned long, ptr, unsigned long, fifth)
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{
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int version, err;
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version = call >> 16; /* hack for backward compatibility */
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call &= 0xffff;
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switch (call) {
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case SEMOP:
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/* struct sembuf is the same on 32 and 64bit :)) */
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err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
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break;
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case SEMTIMEDOP:
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err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
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compat_ptr(fifth));
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break;
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case SEMGET:
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err = sys_semget(first, second, third);
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break;
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case SEMCTL:
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err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
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break;
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case MSGSND:
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err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
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break;
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case MSGRCV:
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err = compat_sys_msgrcv(first, second, fifth, third,
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version, compat_ptr(ptr));
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break;
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case MSGGET:
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err = sys_msgget((key_t) first, second);
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break;
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case MSGCTL:
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err = compat_sys_msgctl(first, second, compat_ptr(ptr));
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break;
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case SHMAT:
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err = compat_sys_shmat(first, second, third, version,
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compat_ptr(ptr));
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break;
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case SHMDT:
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err = sys_shmdt(compat_ptr(ptr));
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break;
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case SHMGET:
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err = sys_shmget(first, (unsigned)second, third);
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break;
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case SHMCTL:
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err = compat_sys_shmctl(first, second, compat_ptr(ptr));
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break;
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default:
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err = -EINVAL;
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break;
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}
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return err;
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}
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#else
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SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
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u32, ptr, u32, fifth)
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{
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return -ENOSYS;
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}
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#endif /* CONFIG_SYSVIPC */
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#ifdef CONFIG_MIPS32_N32
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SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg)
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{
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/* compat_sys_semctl expects a pointer to union semun */
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u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
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if (put_user(arg, uptr))
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return -EFAULT;
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return compat_sys_semctl(semid, semnum, cmd, uptr);
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}
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SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
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int, msgflg)
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{
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return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
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}
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SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
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int, msgtyp, int, msgflg)
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{
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return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
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compat_ptr(msgp));
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}
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#endif
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struct sysctl_args32
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{
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compat_caddr_t name;
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int nlen;
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compat_caddr_t oldval;
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compat_caddr_t oldlenp;
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compat_caddr_t newval;
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compat_size_t newlen;
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unsigned int __unused[4];
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};
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#ifdef CONFIG_SYSCTL_SYSCALL
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SYSCALL_DEFINE1(32_sysctl, struct sysctl_args32 __user *, args)
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{
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struct sysctl_args32 tmp;
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int error;
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size_t oldlen;
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size_t __user *oldlenp = NULL;
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unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
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if (copy_from_user(&tmp, args, sizeof(tmp)))
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return -EFAULT;
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if (tmp.oldval && tmp.oldlenp) {
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/* Duh, this is ugly and might not work if sysctl_args
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is in read-only memory, but do_sysctl does indirectly
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a lot of uaccess in both directions and we'd have to
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basically copy the whole sysctl.c here, and
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glibc's __sysctl uses rw memory for the structure
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anyway. */
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if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) ||
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put_user(oldlen, (size_t __user *)addr))
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return -EFAULT;
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oldlenp = (size_t __user *)addr;
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}
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lock_kernel();
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error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
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oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
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unlock_kernel();
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if (oldlenp) {
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if (!error) {
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if (get_user(oldlen, (size_t __user *)addr) ||
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put_user(oldlen, (u32 __user *)A(tmp.oldlenp)))
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error = -EFAULT;
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}
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copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
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}
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return error;
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}
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#else
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SYSCALL_DEFINE1(32_sysctl, struct sysctl_args32 __user *, args)
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{
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return -ENOSYS;
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}
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#endif /* CONFIG_SYSCTL_SYSCALL */
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SYSCALL_DEFINE1(32_newuname, struct new_utsname __user *, name)
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{
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int ret = 0;
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down_read(&uts_sem);
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if (copy_to_user(name, utsname(), sizeof *name))
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ret = -EFAULT;
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up_read(&uts_sem);
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if (current->personality == PER_LINUX32 && !ret)
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if (copy_to_user(name->machine, "mips\0\0\0", 8))
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ret = -EFAULT;
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return ret;
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}
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SYSCALL_DEFINE1(32_personality, unsigned long, personality)
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{
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int ret;
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personality &= 0xffffffff;
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if (personality(current->personality) == PER_LINUX32 &&
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personality == PER_LINUX)
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personality = PER_LINUX32;
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ret = sys_personality(personality);
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if (ret == PER_LINUX32)
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ret = PER_LINUX;
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return ret;
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}
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SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, in_fd,
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compat_off_t __user *, offset, s32, count)
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{
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mm_segment_t old_fs = get_fs();
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int ret;
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off_t of;
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if (offset && get_user(of, offset))
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return -EFAULT;
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set_fs(KERNEL_DS);
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ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
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set_fs(old_fs);
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if (offset && put_user(of, offset))
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return -EFAULT;
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return ret;
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}
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asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
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size_t count)
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{
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return sys_readahead(fd, merge_64(a2, a3), count);
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}
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asmlinkage long sys32_sync_file_range(int fd, int __pad,
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unsigned long a2, unsigned long a3,
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unsigned long a4, unsigned long a5,
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int flags)
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{
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return sys_sync_file_range(fd,
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merge_64(a2, a3), merge_64(a4, a5),
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flags);
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}
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asmlinkage long sys32_fadvise64_64(int fd, int __pad,
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unsigned long a2, unsigned long a3,
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unsigned long a4, unsigned long a5,
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int flags)
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{
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return sys_fadvise64_64(fd,
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merge_64(a2, a3), merge_64(a4, a5),
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flags);
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}
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asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
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unsigned offset_a3, unsigned len_a4, unsigned len_a5)
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{
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return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
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merge_64(len_a4, len_a5));
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}
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save_static_function(sys32_clone);
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static int noinline __used
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_sys32_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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/* Use __dummy4 instead of getting it off the stack, so that
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syscall() works. */
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child_tidptr = (int __user *) __dummy4;
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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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