157 lines
2.3 KiB
C
157 lines
2.3 KiB
C
#include "sys/syscall.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <_ansi.h>
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#include <errno.h>
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extern char _start_heap;
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extern char _end_heap;
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extern char _start_bss;
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extern char _end_bss;
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static int argl(long value)
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{
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asm("ld r0,%H0" : : "r" (value));
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asm("ld r1,%I0" : : "r" (value));
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asm("sc %0" : : "i" (SYS_ARG));
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}
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static int argw(value)
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{
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asm("ld r1,%H0" : : "r" ( value));
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asm("ld r0,#0");
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asm("sc %0" : : "i" (SYS_ARG));
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}
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static int argp(void *value)
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{
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#ifdef __Z8001__
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asm("ld r0,%H0" : : "r" (value));
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asm("ld r1,%I0" : : "r" (value));
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#else
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asm("ld r1,%H0" : : "r" ( value));
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asm("ld r0,#0");
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#endif
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asm("sc %0" : : "i" (SYS_ARG));
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}
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#define ARGL(n, value) argl(value)
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#define ARGW(n, value) argw(value)
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#define ARGP(n, value) argp(value)
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#define MACRO(n) asm("sc %0" : : "i" (n));
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int _read (int fd, char *buf,size_t nbytes)
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{
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ARGW(0,fd);
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ARGP(1,buf);
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ARGP(2,(void *)(nbytes));
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MACRO(SYS_read);
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}
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int _write (int fd, char *buf, size_t nbytes)
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{
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ARGW(0,fd);
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ARGP(1,buf);
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ARGP(2,(void *)(nbytes));
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MACRO(SYS_write);
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}
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int _open (const char *buf, int flags, int mode)
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{
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ARGP(0, buf);
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ARGW(1, flags);
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ARGW(2, mode);
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MACRO(SYS_open);
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}
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int _close (int fd)
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{
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ARGW(0,fd);
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MACRO(SYS_close );
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}
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/*
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* sbrk -- changes heap size size. Get nbytes more
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* RAM. We just increment a pointer in what's
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* left of memory on the board.
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*/
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caddr_t _sbrk (size_t nbytes)
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{
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static char* heap_ptr = NULL;
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caddr_t base;
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if (heap_ptr == NULL) {
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heap_ptr = (caddr_t)&_start_heap;
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}
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if (heap_ptr + nbytes < &_end_heap) {
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base = heap_ptr;
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heap_ptr += nbytes;
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return (heap_ptr);
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} else {
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errno = ENOMEM;
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return ((caddr_t)-1);
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}
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}
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int isatty (int fd)
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{
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ARGW(0,fd);
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MACRO(SYS_isatty);
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}
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off_t _lseek (int fd, off_t offset, int whence)
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{
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ARGW(0,fd);
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ARGL(1,offset);
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ARGW(2, whence);
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MACRO(SYS_lseek);
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}
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int _fstat (int fd, struct stat *buf)
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{
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ARGW(0,fd);
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ARGP(1,buf);
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MACRO(SYS_fstat);
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}
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int
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_exit(int val)
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{
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ARGW(0,val);
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MACRO(SYS_exit);
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}
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time_t _time(time_t *timer)
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{
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ARGP(0,timer);
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MACRO(SYS_time);
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}
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int
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_creat (const char *path, int mode)
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{
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ARGP(0, path);
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ARGW(1, mode);
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MACRO(SYS_creat);
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}
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_kill(int pid, int val)
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{
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_exit(val);
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}
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_getpid()
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{
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return 1;
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}
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