File:  [Qemu by Fabrice Bellard] / qemu / tests / hello-mips.c
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:45:23 2018 UTC (3 years, 3 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu1001, qemu1000, qemu0151, qemu0150, qemu0141, qemu0140, qemu0130, qemu0125, qemu0124, qemu0123, qemu0122, qemu0121, qemu0120, qemu0111, qemu0110, qemu0105, qemu0104, qemu0103, qemu0102, qemu0101, qemu0100, qemu0091, qemu0090, HEAD
qemu 0.9.0

    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: }

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