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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [xstormy16/] [eva_app.c] - Rev 304
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/* eva_app.c -- Glue code for linking apps to run under GDB debugger control. * * Copyright (c) 2001 Red Hat, Inc. * * The authors hereby grant permission to use, copy, modify, distribute, * and license this software and its documentation for any purpose, provided * that existing copyright notices are retained in all copies and that this * notice is included verbatim in any distributions. No written agreement, * license, or royalty fee is required for any of the authorized uses. * Modifications to this software may be copyrighted by their authors * and need not follow the licensing terms described here, provided that * the new terms are clearly indicated on the first page of each file where * they apply. */ #include "glue.h" typedef void (*write_proc_t)(char *buf, int nbytes); typedef int (*read_proc_t)(char *buf, int nbytes); /* There is no "syscall", so we just call directly into the stub code at fixed addresses. */ #define STUB_WRITE(p,n) ((write_proc_t)0x8084)((p),(n)) #define STUB_READ(p,n) ((read_proc_t)0x8088)((p),(n)) /* * print -- do a raw print of a string */ void print(char *ptr) { STUB_WRITE(ptr, strlen(ptr)); } /* * write -- write bytes to the serial port. Ignore fd, since * stdout and stderr are the same. Since we have no filesystem, * open will only return an error. */ int _write (int fd, char *buf, int nbytes) { STUB_WRITE(buf, nbytes); return (nbytes); } int _read (int fd, char *buf, int nbytes) { return STUB_READ(buf, nbytes); } extern char _end[]; #define HEAP_LIMIT ((char *)0xffff) void * _sbrk(int inc) { static char *heap_ptr = _end; void *base; if (inc > (HEAP_LIMIT - heap_ptr)) return (void *)-1; base = heap_ptr; heap_ptr += inc; return base; } void _exit(int n) { while (1) { asm volatile ("nop"); asm volatile (".hword 0x0006"); /* breakpoint (special illegal insn) */ } }
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