yagarto编译syscalls.c出错 extern char end asm (
yagarto编译syscalls.c出错 extern char end asm ("end"); // Defined by the linker提示end未定义 请教一下大家代码如下
/****************************************************************************
*Copyright (c) 2009 by Michael Fischer. All rights reserved.
*
*Redistribution and use in source and binary forms, with or without
*modification, are permitted provided that the following conditions
*are met:
*
*1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*3. Neither the name of the author nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
*THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
*"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
*LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
*FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
*THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
*INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
*BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
*OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
*AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
*OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
*THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
*SUCH DAMAGE.
*
****************************************************************************
*History:
*
*28.03.09mifi First Version, based on the original syscall.c from
* newlib version 1.17.0
****************************************************************************/
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
/***************************************************************************/
int _read_r (struct _reent *r, int file, char * ptr, int len)
{
r = r;
file = file;
ptr = ptr;
len = len;
errno = EINVAL;
return -1;
}
/***************************************************************************/
int _lseek_r (struct _reent *r, int file, int ptr, int dir)
{
r = r;
file = file;
ptr = ptr;
dir = dir;
return 0;
}
/***************************************************************************/
int _write_r (struct _reent *r, int file, char * ptr, int len)
{
r = r;
file = file;
ptr = ptr;
#if 0
int index;
/* For example, output string by UART */
for(index=0; index<len; index++)
{
if (ptr == '\n')
{
uart_putc('\r');
}
uart_putc(ptr);
}
#endif
return len;
}
/***************************************************************************/
int _close_r (struct _reent *r, int file)
{
return 0;
}
/***************************************************************************/
/* Register name faking - works in collusion with the linker.*/
register char * stack_ptr asm ("sp");
caddr_t _sbrk_r (struct _reent *r, int incr)
{
extern char end asm ("end"); /* Defined by the linker.*/
static char * heap_end;
char * prev_heap_end;
if (heap_end == NULL)
heap_end = & end;
prev_heap_end = heap_end;
if (heap_end + incr > stack_ptr)
{
/* Some of the libstdc++-v3 tests rely upon detecting
out of memory errors, so do not abort here.*/
#if 0
extern void abort (void);
_write (1, "_sbrk: Heap and stack collision\n", 32);
abort ();
#else
errno = ENOMEM;
return (caddr_t) -1;
#endif
}
heap_end += incr;
return (caddr_t) prev_heap_end;
}
/***************************************************************************/
int _fstat_r (struct _reent *r, int file, struct stat * st)
{
r = r;
file = file;
memset (st, 0, sizeof (* st));
st->st_mode = S_IFCHR;
return 0;
}
/***************************************************************************/
int _isatty_r(struct _reent *r, int fd)
{
r = r;
fd = fd;
return 1;
}
/*** EOF ***/ 问题以找到在.ld文件下加一句 PROVIDE (end = .);就可以了 回复【1楼】suxiaobo
-----------------------------------------------------------------------
Nice.
我在.bbs后加 PROVIDE ( end = _ebss );
也可以了。
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