Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m32r/kernel/sys_m32r.c |
| 3 | * |
| 4 | * This file contains various random system calls that |
| 5 | * have a non-standard calling sequence on the Linux/M32R platform. |
| 6 | * |
| 7 | * Taken from i386 version. |
| 8 | */ |
| 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/errno.h> |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/mm.h> |
Hirokazu Takata | cfcd8c4 | 2007-07-30 22:00:47 +0900 | [diff] [blame] | 13 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/sem.h> |
| 16 | #include <linux/msg.h> |
| 17 | #include <linux/shm.h> |
| 18 | #include <linux/stat.h> |
| 19 | #include <linux/syscalls.h> |
| 20 | #include <linux/mman.h> |
| 21 | #include <linux/file.h> |
| 22 | #include <linux/utsname.h> |
Adrian Bunk | cba4fbb | 2007-10-16 23:29:24 -0700 | [diff] [blame] | 23 | #include <linux/ipc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include <asm/uaccess.h> |
| 26 | #include <asm/cachectl.h> |
| 27 | #include <asm/cacheflush.h> |
Arnd Bergmann | fe74290 | 2006-10-02 02:18:34 -0700 | [diff] [blame] | 28 | #include <asm/syscall.h> |
| 29 | #include <asm/unistd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | /* |
| 32 | * sys_tas() - test-and-set |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | */ |
Al Viro | fd2c903 | 2006-10-11 17:24:55 +0100 | [diff] [blame] | 34 | asmlinkage int sys_tas(int __user *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | { |
| 36 | int oldval; |
| 37 | |
| 38 | if (!access_ok(VERIFY_WRITE, addr, sizeof (int))) |
| 39 | return -EFAULT; |
| 40 | |
Hirokazu Takata | cf535ea | 2006-02-20 18:28:17 -0800 | [diff] [blame] | 41 | /* atomic operation: |
| 42 | * oldval = *addr; *addr = 1; |
| 43 | */ |
| 44 | __asm__ __volatile__ ( |
| 45 | DCACHE_CLEAR("%0", "r4", "%1") |
| 46 | " .fillinsn\n" |
| 47 | "1:\n" |
| 48 | " lock %0, @%1 -> unlock %2, @%1\n" |
| 49 | "2:\n" |
| 50 | /* NOTE: |
| 51 | * The m32r processor can accept interrupts only |
| 52 | * at the 32-bit instruction boundary. |
| 53 | * So, in the above code, the "unlock" instruction |
| 54 | * can be executed continuously after the "lock" |
| 55 | * instruction execution without any interruptions. |
| 56 | */ |
| 57 | ".section .fixup,\"ax\"\n" |
| 58 | " .balign 4\n" |
| 59 | "3: ldi %0, #%3\n" |
| 60 | " seth r14, #high(2b)\n" |
| 61 | " or3 r14, r14, #low(2b)\n" |
| 62 | " jmp r14\n" |
| 63 | ".previous\n" |
| 64 | ".section __ex_table,\"a\"\n" |
| 65 | " .balign 4\n" |
| 66 | " .long 1b,3b\n" |
| 67 | ".previous\n" |
| 68 | : "=&r" (oldval) |
| 69 | : "r" (addr), "r" (1), "i"(-EFAULT) |
| 70 | : "r14", "memory" |
| 71 | #ifdef CONFIG_CHIP_M32700_TS1 |
| 72 | , "r4" |
| 73 | #endif /* CONFIG_CHIP_M32700_TS1 */ |
| 74 | ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | return oldval; |
| 77 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | asmlinkage int sys_cacheflush(void *addr, int bytes, int cache) |
| 80 | { |
Simon Arlott | 5aa8b6c | 2007-10-20 01:14:39 +0200 | [diff] [blame] | 81 | /* This should flush more selectively ... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | _flush_cache_all(); |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | asmlinkage int sys_cachectl(char *addr, int nbytes, int op) |
| 87 | { |
| 88 | /* Not implemented yet. */ |
| 89 | return -ENOSYS; |
| 90 | } |
| 91 | |
Arnd Bergmann | fe74290 | 2006-10-02 02:18:34 -0700 | [diff] [blame] | 92 | /* |
| 93 | * Do a system call from kernel instead of calling sys_execve so we |
| 94 | * end up with proper pt_regs. |
| 95 | */ |
David Howells | d762746 | 2010-08-17 23:52:56 +0100 | [diff] [blame] | 96 | int kernel_execve(const char *filename, |
| 97 | const char *const argv[], |
| 98 | const char *const envp[]) |
Arnd Bergmann | fe74290 | 2006-10-02 02:18:34 -0700 | [diff] [blame] | 99 | { |
| 100 | register long __scno __asm__ ("r7") = __NR_execve; |
| 101 | register long __arg3 __asm__ ("r2") = (long)(envp); |
| 102 | register long __arg2 __asm__ ("r1") = (long)(argv); |
| 103 | register long __res __asm__ ("r0") = (long)(filename); |
| 104 | __asm__ __volatile__ ( |
| 105 | "trap #" SYSCALL_VECTOR "|| nop" |
| 106 | : "=r" (__res) |
| 107 | : "r" (__scno), "0" (__res), "r" (__arg2), |
| 108 | "r" (__arg3) |
| 109 | : "memory"); |
| 110 | return __res; |
| 111 | } |