Linux Kernel  3.7.1
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sys_h8300.c
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1 /*
2  * linux/arch/h8300/kernel/sys_h8300.c
3  *
4  * This file contains various random system calls that
5  * have a non-standard calling sequence on the H8/300
6  * platform.
7  */
8 
9 #include <linux/errno.h>
10 #include <linux/sched.h>
11 #include <linux/mm.h>
12 #include <linux/smp.h>
13 #include <linux/sem.h>
14 #include <linux/msg.h>
15 #include <linux/shm.h>
16 #include <linux/stat.h>
17 #include <linux/syscalls.h>
18 #include <linux/mman.h>
19 #include <linux/file.h>
20 #include <linux/fs.h>
21 #include <linux/ipc.h>
22 
23 #include <asm/setup.h>
24 #include <asm/uaccess.h>
25 #include <asm/cachectl.h>
26 #include <asm/traps.h>
27 #include <asm/unistd.h>
28 
29 /* sys_cacheflush -- no support. */
30 asmlinkage int
31 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
32 {
33  return -EINVAL;
34 }
35 
37 {
38  return PAGE_SIZE;
39 }
40 
41 #if defined(CONFIG_SYSCALL_PRINT)
42 asmlinkage void syscall_print(void *dummy,...)
43 {
44  struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
45  printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
46  ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
47 }
48 #endif
49 
50 /*
51  * Do a system call from kernel instead of calling sys_execve so we
52  * end up with proper pt_regs.
53  */
55 int kernel_execve(const char *filename,
56  const char *const argv[],
57  const char *const envp[])
58 {
59  register long res __asm__("er0");
60  register const char *const *_c __asm__("er3") = envp;
61  register const char *const *_b __asm__("er2") = argv;
62  register const char * _a __asm__("er1") = filename;
63  __asm__ __volatile__ ("mov.l %1,er0\n\t"
64  "trapa #0\n\t"
65  : "=r" (res)
66  : "g" (__NR_execve),
67  "g" (_a),
68  "g" (_b),
69  "g" (_c)
70  : "cc", "memory");
71  return res;
72 }
73 
74