30766f1105
The unusual function calling conventions on SuperH ended up causing
sync_file_range to have the wrong argument order, with the 'flags'
argument getting sorted before 'nbytes' by the compiler.
In userspace, I found that musl, glibc, uclibc and strace all expect the
normal calling conventions with 'nbytes' last, so changing the kernel
to match them should make all of those work.
In order to be able to also fix libc implementations to work with existing
kernels, they need to be able to tell which ABI is used. An easy way
to do this is to add yet another system call using the sync_file_range2
ABI that works the same on all architectures.
Old user binaries can now work on new kernels, and new binaries can
try the new sync_file_range2() to work with new kernels or fall back
to the old sync_file_range() version if that doesn't exist.
Cc: stable@vger.kernel.org
Fixes: 75c92acdd5 ("sh: Wire up new syscalls.")
Acked-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <linux/mm.h>
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#include <linux/smp.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/file.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/ipc.h>
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#include <asm/cacheflush.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/syscalls.h>
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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 sys_sh_pipe(void)
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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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current_pt_regs()->regs[1] = fd[1];
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return fd[0];
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}
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return error;
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}
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asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char __user *buf,
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size_t count, long dummy, loff_t pos)
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{
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return ksys_pread64(fd, buf, count, pos);
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}
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asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char __user *buf,
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size_t count, long dummy, loff_t pos)
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{
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return ksys_pwrite64(fd, buf, count, pos);
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}
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asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
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u32 len0, u32 len1, int advice)
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{
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#ifdef __LITTLE_ENDIAN__
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return ksys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
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(u64)len1 << 32 | len0, advice);
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#else
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return ksys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
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(u64)len0 << 32 | len1, advice);
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#endif
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}
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/*
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* swap the arguments the way that libc wants them instead of
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* moving flags ahead of the 64-bit nbytes argument
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*/
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SYSCALL_DEFINE6(sh_sync_file_range6, int, fd, SC_ARG64(offset),
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SC_ARG64(nbytes), unsigned int, flags)
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{
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return ksys_sync_file_range(fd, SC_VAL64(loff_t, offset),
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SC_VAL64(loff_t, nbytes), flags);
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}
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