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Compiling for MIPS - Problem with "mips-linux-ld" address exeption in r

To: linux-mips@linux-mips.org
Subject: Compiling for MIPS - Problem with "mips-linux-ld" address exeption in run time
From: Bemipefe <bemipefe@libero.it>
Date: Mon, 22 Oct 2007 23:07:51 +0200
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
User-agent: KMail/1.9.4
Hi to all mips programmers!
First i want sorry for my bad english ... i'm working for upgrade :-D 

So i want to submit any question:

I'm compiling with mips compiler gcc (mips-linux-gcc from tools mips-2007 iso 
image ) and all GNU tools and i have any problems.

I succeed to compile the program demo "hello_mips.c" from gxemul sample in 
this way:


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$mips-linux-gcc -I../../src/include/testmachine -g -DMIPS 
hello.c -mips1 -mabi=32 -c -o hello_mips32.o

$mips-linux-ld -T 
/home/bemipefe/Programs/mipstools/usr/lib/ldscripts/elf32btsmip.x  -e 
f hello_mips32.o -o hello_mips32                         


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____________________________________________________________________

As you see i must specify the script for linking because option "-Ttext 
0x80030000" supplied from gxemul README don't work.

So i have modified the script changing "0x1000000" in "0x10000000" in that is:

PROVIDE (__executable_start = 0x10000000); . = 0x10000000 + SIZEOF_HEADERS;
 
I have also added "SIZEOF_HEADERS" that (at first "0") . Now the linker don't 
claim any message but if i test the binary, occur a exeption in run time:
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[bemipefe@M-Parallelmind hello]$  ../../gxemul -V -E testmips -C 
R3000 ./hello_mips32
GXemul 0.4.4    Copyright (C) 2003-2007  Anders Gavare
Read the source code and/or documentation for other Copyright messages.

Simple setup...
    net: simulating 10.0.0.0/8 (max outgoing: TCP=100, UDP=100)
        simulated gateway: 10.0.0.254 (60:50:40:30:20:10)
            using nameserver 192.168.1.1
    machine "default":
        memory: 32 MB
        cpu0: R3000 (I+D = 4+4 KB)
        machine: MIPS test machine
        loading ./hello_mips32
        starting cpu0 at 0x100001ac
-------------------------------------------------------------------------------

GXemul> step
[ exception TLBL <tlb> vaddr=0x100001ac pc=0x100001ac ]
80000000: 00000000      nop
 

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If I change "0x10000000" in "0x80000000" and also the section:

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 /* Adjust the address for the data segment.  We want to adjust up to
     the same address within the page on the next page up.  */
  . = 0x80000000;

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____________________________________________________________________

In the same way from "0x10000000" to "0x80000000". Now i do run the program 
with gxemul and i still down in trap of "exeption" in TLBL:

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____________________________________________________________________

[bemipefe@M-Parallelmind hello]$  ../../gxemul -V -E testmips -C 
R3000 ./hello_mips32
GXemul 0.4.4    Copyright (C) 2003-2007  Anders Gavare
Read the source code and/or documentation for other Copyright messages.

Simple setup...
    net: simulating 10.0.0.0/8 (max outgoing: TCP=100, UDP=100)
        simulated gateway: 10.0.0.254 (60:50:40:30:20:10)
            using nameserver 192.168.1.1
    machine "default":
        memory: 32 MB
        cpu0: R3000 (I+D = 4+4 KB)
        machine: MIPS test machine
        loading ./hello_mips32
        starting cpu0 at 0x800001ac
-------------------------------------------------------------------------------

GXemul> step
800001ac: 3c1c0000      lui     gp,0x0
GXemul> step
800001b0: 279c7e44      addiu   gp,gp,32324
GXemul> step
800001b4: 0399e021      addu    gp,gp,t9
GXemul> step
800001b8: 27bdffe0      addiu   sp,sp,-32
GXemul> step
800001bc: afbf001c      sw      ra,28(sp)       [0xa0007efc]
GXemul> step
800001c0: afbe0018      sw      fp,24(sp)       [0xa0007ef8]
GXemul> step
800001c4: 03a0f021      move    fp,sp
GXemul> step
800001c8: afbc0010      sw      gp,16(sp)       [0xa0007ef0]
GXemul> step
800001cc: 8f828018      lw      v0,-32744(gp)   [0xfffffe5c]
[ exception TLBL <tlb> vaddr=0xfffffe5c pc=0x800001cc ]

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But in this time i see any executed istruction.


The ask is: How can fix it ? The problem is in the linker ? How can find 
documentation from ELF format ?

Thank you and Good Work!  

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