mirror of https://gitee.com/openkylin/qemu.git
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
#define __NR_SYSCALL_BASE 0x900000
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#define __NR_exit1 (__NR_SYSCALL_BASE+ 1)
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#define __NR_write (__NR_SYSCALL_BASE+ 4)
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#define __sys2(x) #x
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#define __sys1(x) __sys2(x)
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#ifndef __syscall
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#define __syscall(name) "swi\t" __sys1(__NR_##name) "\n\t"
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#endif
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#define __syscall_return(type, res) \
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do { \
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return (type) (res); \
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} while (0)
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#define _syscall0(type,name) \
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type name(void) { \
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long __res; \
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__asm__ __volatile__ ( \
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__syscall(name) \
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"mov %0,r0" \
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:"=r" (__res) : : "r0","lr"); \
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__syscall_return(type,__res); \
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}
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#define _syscall1(type,name,type1,arg1) \
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type name(type1 arg1) { \
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long __res; \
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__asm__ __volatile__ ( \
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"mov\tr0,%1\n\t" \
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__syscall(name) \
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"mov %0,r0" \
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: "=r" (__res) \
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: "r" ((long)(arg1)) \
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: "r0","lr"); \
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__syscall_return(type,__res); \
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}
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#define _syscall2(type,name,type1,arg1,type2,arg2) \
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type name(type1 arg1,type2 arg2) { \
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long __res; \
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__asm__ __volatile__ ( \
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"mov\tr0,%1\n\t" \
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"mov\tr1,%2\n\t" \
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__syscall(name) \
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"mov\t%0,r0" \
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: "=r" (__res) \
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: "r" ((long)(arg1)),"r" ((long)(arg2)) \
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: "r0","r1","lr"); \
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__syscall_return(type,__res); \
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}
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#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \
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type name(type1 arg1,type2 arg2,type3 arg3) { \
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long __res; \
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__asm__ __volatile__ ( \
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"mov\tr0,%1\n\t" \
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"mov\tr1,%2\n\t" \
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"mov\tr2,%3\n\t" \
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__syscall(name) \
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"mov\t%0,r0" \
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: "=r" (__res) \
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: "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3)) \
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: "r0","r1","r2","lr"); \
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__syscall_return(type,__res); \
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}
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#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
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type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \
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long __res; \
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__asm__ __volatile__ ( \
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"mov\tr0,%1\n\t" \
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"mov\tr1,%2\n\t" \
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"mov\tr2,%3\n\t" \
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"mov\tr3,%4\n\t" \
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__syscall(name) \
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"mov\t%0,r0" \
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: "=r" (__res) \
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: "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3)),"r" ((long)(arg4)) \
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: "r0","r1","r2","r3","lr"); \
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__syscall_return(type,__res); \
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}
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#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \
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type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) { \
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long __res; \
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__asm__ __volatile__ ( \
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"mov\tr0,%1\n\t" \
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"mov\tr1,%2\n\t" \
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"mov\tr2,%3\n\t" \
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"mov\tr3,%4\n\t" \
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"mov\tr4,%5\n\t" \
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__syscall(name) \
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"mov\t%0,r0" \
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: "=r" (__res) \
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: "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3)),"r" ((long)(arg4)), \
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"r" ((long)(arg5)) \
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: "r0","r1","r2","r3","r4","lr"); \
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__syscall_return(type,__res); \
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}
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_syscall1(int,exit1,int,status);
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_syscall3(int,write,int,fd,const char *,buf, int, len);
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void _start(void)
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{
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write(1, "Hello World\n", 12);
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exit1(0);
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}
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