PageRenderTime 26ms CodeModel.GetById 22ms app.highlight 3ms RepoModel.GetById 0ms app.codeStats 0ms

/arch/sh/kernel/sys_sh32.c

https://bitbucket.org/ndreys/linux-sunxi
C | 86 lines | 71 code | 7 blank | 8 comment | 2 complexity | 82a1bfea2b897aebaab2e375edbf845e MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 1#include <linux/errno.h>
 2#include <linux/sched.h>
 3#include <linux/mm.h>
 4#include <linux/smp.h>
 5#include <linux/sem.h>
 6#include <linux/msg.h>
 7#include <linux/shm.h>
 8#include <linux/stat.h>
 9#include <linux/syscalls.h>
10#include <linux/mman.h>
11#include <linux/file.h>
12#include <linux/module.h>
13#include <linux/fs.h>
14#include <linux/ipc.h>
15#include <asm/cacheflush.h>
16#include <asm/uaccess.h>
17#include <asm/unistd.h>
18#include <asm/syscalls.h>
19
20/*
21 * sys_pipe() is the normal C calling standard for creating
22 * a pipe. It's not the way Unix traditionally does this, though.
23 */
24asmlinkage int sys_sh_pipe(unsigned long r4, unsigned long r5,
25	unsigned long r6, unsigned long r7,
26	struct pt_regs __regs)
27{
28	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
29	int fd[2];
30	int error;
31
32	error = do_pipe_flags(fd, 0);
33	if (!error) {
34		regs->regs[1] = fd[1];
35		return fd[0];
36	}
37	return error;
38}
39
40asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char __user *buf,
41			     size_t count, long dummy, loff_t pos)
42{
43	return sys_pread64(fd, buf, count, pos);
44}
45
46asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char __user *buf,
47			      size_t count, long dummy, loff_t pos)
48{
49	return sys_pwrite64(fd, buf, count, pos);
50}
51
52asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
53				u32 len0, u32 len1, int advice)
54{
55#ifdef  __LITTLE_ENDIAN__
56	return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
57				(u64)len1 << 32 | len0,	advice);
58#else
59	return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
60				(u64)len0 << 32 | len1,	advice);
61#endif
62}
63
64#if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A)
65#define SYSCALL_ARG3	"trapa #0x23"
66#else
67#define SYSCALL_ARG3	"trapa #0x13"
68#endif
69
70/*
71 * Do a system call from kernel instead of calling sys_execve so we
72 * end up with proper pt_regs.
73 */
74int kernel_execve(const char *filename,
75		  const char *const argv[],
76		  const char *const envp[])
77{
78	register long __sc0 __asm__ ("r3") = __NR_execve;
79	register long __sc4 __asm__ ("r4") = (long) filename;
80	register long __sc5 __asm__ ("r5") = (long) argv;
81	register long __sc6 __asm__ ("r6") = (long) envp;
82	__asm__ __volatile__ (SYSCALL_ARG3 : "=z" (__sc0)
83			: "0" (__sc0), "r" (__sc4), "r" (__sc5), "r" (__sc6)
84			: "memory");
85	return __sc0;
86}