sys_sh32.c

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#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/ipc.h>
#include <asm/cacheflush.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <asm/syscalls.h>

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way Unix traditionally does this, though.
 */
asmlinkage int sys_sh_pipe(unsigned long r4, unsigned long r5,
    unsigned long r6, unsigned long r7,
    struct pt_regs __regs)
{
    struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
    int fd[2];
    int error;

    error = do_pipe_flags(fd, 0);
    if (!error) {
        regs->regs[1] = fd[1];
        return fd[0];
    }
    return error;
}

asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char __user *buf,
                 size_t count, long dummy, loff_t pos)
{
    return sys_pread64(fd, buf, count, pos);
}

asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char __user *buf,
                  size_t count, long dummy, loff_t pos)
{
    return sys_pwrite64(fd, buf, count, pos);
}

asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
                u32 len0, u32 len1, int advice)
{
#ifdef  __LITTLE_ENDIAN__
    return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
                (u64)len1 << 32 | len0, advice);
#else
    return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
                (u64)len0 << 32 | len1, advice);
#endif
}

#if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A)
#define SYSCALL_ARG3    "trapa #0x23"
#else
#define SYSCALL_ARG3    "trapa #0x13"
#endif

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename,
          const char *const argv[],
          const char *const envp[])
{
    register long __sc0 __asm__ ("r3") = __NR_execve;
    register long __sc4 __asm__ ("r4") = (long) filename;
    register long __sc5 __asm__ ("r5") = (long) argv;
    register long __sc6 __asm__ ("r6") = (long) envp;
    __asm__ __volatile__ (SYSCALL_ARG3 : "=z" (__sc0)
            : "0" (__sc0), "r" (__sc4), "r" (__sc5), "r" (__sc6)
            : "memory");
    return __sc0;
}