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28 lines
776 B
C
28 lines
776 B
C
#include "sys/syscall.h"
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int _read(file, ptr, len)
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int file;
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char *ptr;
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int len;
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{
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register int ret asm("r0") ;
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/* Type cast int as short so that we can copy int values into 16 bit
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registers in case of -mint32 switch is given.
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This is not going to affect data as file= 0 for stdin and len=1024 */
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asm("mov.b %0, r0l":: "i" (SYS_read)) ; /* Syscall Number */
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asm("mov.w %0, r1" :: "r"((short)file) :"r1", "r2", "r3") ;
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asm("mov.w %0, r3" :: "r"((short)len) :"r1", "r2", "r3") ;
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#if defined(__H8300__) || defined(__NORMAL_MODE__)
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asm("mov.w %0, r2" :: "r"(ptr) :"r1", "r2", "r3") ;
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#else
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asm("mov.l %0, er2" :: "r"(ptr) :"r1", "er2", "r3") ;
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#endif
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// This is magic trap similar to _write for simulator
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asm("jsr @@0xc8") ;
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return ret;
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}
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