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