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Message
From: Cool_ABen@s...<Cool_ABen@s...>
Date: Tue Dec 30 09:07:19 CET 2003
Subject: [openrisc] About "malloc" in the simulator and in the FPGA
Hi All:
Recently I wrote a little program "test.c" to test the "malloc"
and "free" functions. The codes are as follows:
"test.c":
#include <stdio.h>
#include <stdlib.h>
int main()
{
char * p;
p = malloc(8*sizeof(char));
if (p == NULL)
return -1;
free(p)
return 0;
}
and the "makefile" script is as follows:
"makefile":
common = ../sw/support/libsupport.a
all:test
test: test.o ../sw/support/reset-icdc.o \
/opt/or32-uclinux/lib/libc.a \
/opt/or32-uclinux/lib/gcc-lib/or32-uclinux/3.1/libgcc.a
or32-uclinux-ld -T ../sw/support/orp.ld $? -o $@.or32 $(common)
test.o: test.c
or32-uclinux-gcc -g -c -o test.o test.c
the support package is downloaded from the cvsweb "/ or1k / orp /
orp_soc / sw" of the opencore.org and the libsupport is in it too.
and the orp.ld script used by or32-uclinux-ld is as follows:
MEMORY
{
vectors : ORIGIN = 0x00000000, LENGTH = 0x00002000
flash : ORIGIN = 0x04000000, LENGTH = 0x00200000
ram : ORIGIN = 0x00002000, LENGTH = 0x001f0000
mp3data : ORIGIN = 0x001f2000, LENGTH = 0x00004000
}
SECTIONS
{
.reset :
{
*(.reset)
} > flash
.text ALIGN(0x04):
{
_text_bin = .;
*(.text)
_text_end = .;
} > flash
.rodata :
{
_rodata_bin = .;
*(.rodata)
_rodata_end = .;
} > flash
.dummy ALIGN(0x04):
{
_src_beg = .;
} > flash
.vectors :
AT ( ADDR (.dummy) )
{
_vec_start = .;
*(.vectors)
_vec_end = .;
} > vectors
.data :
AT ( ADDR (.dummy) + SIZEOF (.vectors) )
{
_dst_beg = .;
*(.data)
_dst_end = .;
} > ram
.mp3data :
{
_mp3_begin = .;
*(.mp3)
_mp3_end = .;
} > mp3data
.bss :
{
*(.bss)
} > ram
.stack :
{
*(.stack)
_src_addr = .;
} > ram
}
then I run the makefile script and the test.or32 is generated.
First I put it in the simulator . I set the breakpoint at the line "p = malloc
(8*sizeof(char));". When entering the function of malloc,many circles of
instructions comes,among malloc_init , udivsi3 ,modsi3 and so on. After
many instructions ,it comes to the mmap functions and implement the
instruction "l.sys 0x1".Then it comes to 0xc00 and implements the "l.j 0"
for ever.
So I send the test.or32 to the fpga board running the or rtl. But to my
disappoint ,the "p" equals NULL and means that malloc cannot work.
I don't know what to do .And anyone can save me? Thanks a lot.
I think simulator should support the malloc operation at least.Or I should
study the code of malloc.c in ulibc library? Thanks a lot.
Thanks and Regards
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