tests/hello-mips.c

   1 /*
   2 * MIPS o32 Linux syscall example
   3 *
   4 * http://www.linux-mips.org/wiki/RISC/os
   5 * http://www.linux-mips.org/wiki/MIPSABIHistory
   6 * http://www.linux.com/howtos/Assembly-HOWTO/mips.shtml
   7 *
   8 * mipsel-linux-gcc -nostdlib -mno-abicalls -fno-PIC -mabi=32 \
   9 *                  -O2 -static -o hello-mips hello-mips.c
  10 *
  11 */
  12 #define __NR_SYSCALL_BASE       4000
  13 #define __NR_exit                       (__NR_SYSCALL_BASE+  1)
  14 #define __NR_write                      (__NR_SYSCALL_BASE+  4)
  15
  16 static inline void exit1(int status)
  17 {
  18     register unsigned long __a0 asm("$4") = (unsigned long) status;
  19
  20     __asm__ __volatile__ (
  21         "       .set push       \n"
  22         "       .set noreorder  \n"
  23         "       li      $2, %0  \n"
  24         "       syscall         \n"
  25         "       .set pop        "
  26         :
  27         : "i" (__NR_exit), "r" (__a0)
  28         : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
  29           "memory");
  30 }
  31
  32 static inline int write(int fd, const char *buf, int len)
  33 {
  34     register unsigned long __a0 asm("$4") = (unsigned long) fd;
  35     register unsigned long __a1 asm("$5") = (unsigned long) buf;
  36     register unsigned long __a2 asm("$6") = (unsigned long) len;
  37     register unsigned long __a3 asm("$7");
  38     unsigned long __v0;
  39
  40     __asm__ __volatile__ (
  41         "       .set push       \n"
  42         "       .set noreorder  \n"
  43         "       li      $2, %2  \n"
  44         "       syscall         \n"
  45         "       move    %0, $2  \n"
  46         "       .set pop        "
  47         : "=r" (__v0), "=r" (__a3)
  48         : "i" (__NR_write), "r" (__a0), "r" (__a1), "r" (__a2)
  49         : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
  50           "memory");
  51
  52 /*    if (__a3 == 0) */
  53         return (int) __v0;
  54 /*
  55     errno = __v0;
  56     return -1;
  57  */
  58 }
  59
  60 void __start(void)
  61 {
  62     write (1, "Hello, World!\n", 14);
  63     exit1 (42);
  64 }