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Message
From: Cool_ABen@s...<Cool_ABen@s...>
Date: Wed Dec 31 01:38:12 CET 2003
Subject: [openrisc] About
Thanks----- Original Message -----
From: Simon Srot <simons@o... >
To: List about "OpenRISC cores, free "microprocessors
<openrisc@o... >
Date: 30 Dec 2003 12:31:45 +0000
Subject: Re: [openrisc] About "malloc" in the simulator and in the
FPGA
>
>
> Hi,
>
> I think you confuse some things here. Malloc is C library function
> which
> at some point calls OS kernel function for memory allocation via
> system
> call (this is this l.sys instruction that you mentioned).
>
> You will need to have OS (linux or uClinux) setup on your
> environment
> (simulator or real board) to run programs like this. Check
> http://www.opencores.org/projects/or1k/uClinux for more information
> on
> this.
>
> Simon
>
> On Tue, 2003-12-30 at 08:07, Cool_ABen@s... wrote:
> > 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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