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Re: Jeeni & ARM720T with GDB





>From: Fernando Nasser <fnasser@cygnus.com>
>To: danish iftikhar <d_iftikhar@hotmail.com>
>CC: grante@visi.com
>Subject: Re: Jeeni & ARM720T with GDB
>Date: Wed, 22 Nov 2000 07:30:20 +0000
>
>Danish,
>
>I believe we need mode information.  The log seems normal to me.
>
>What is the value of the PC  (P/x $pc) after the load?
>
>Can you do a "x/30i $pc" so we see the startup code?
>
>When you do "break main", what is printed?
>
>And, maybe before all that, what was the exact command you've used to 
>compile?
>
>What is the output when you add "-v" to your gcc command?
>
>Fernando
>
***************************************************
  Hi

   i am enclosing all the information that u have asked for :

  arm-elf-gcc -v
Reading specs from 
/proj/danish/ECOS_EP7211/tools/H-i686-pc-linux-gnu/lib/gcc-lib/arm-elf/2.95.2/specs
gcc version 2.95.2 19991024 (release)

the command i am using to compile is :
CXX = arm-elf-gcc -mcpu=arm7tdmi -D__EDB7211


arm-elf-gdb -v
GNU gdb 5.0
Copyright 2000 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain 
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=i686-pc-linux-gnu --target=arm-elf".


After load Pc shows the address : 0x8060

The start uo code is :
(gdb) x/30i $pc
0x8060 <warm_reset>:    mrs     r7, cpsr
0x8064 <warm_reset+4>:  and     r7, r7, #31     ; 0x1f
0x8068 <warm_reset+8>:  cmp     r7, #19 ; 0x13
0x806c <warm_reset+12>: beq     0x80a0 <start>
0x8070 <warm_reset+16>: mov     r0, #0  ; 0x0
0x8074 <warm_reset+20>: str     r0, [r0, #64]
0x8078 <warm_reset+24>: ldr     r1, [pc, #4c0]  ; 0x8540 <_eCos_id+20>
0x807c <warm_reset+28>: ldr     r2, [r1, #4]
0x8080 <warm_reset+32>: str     r2, [r0, #4]
0x8084 <warm_reset+36>: ldr     r2, [r1, #36]
0x8088 <warm_reset+40>: str     r2, [r0, #36]
0x808c <warm_reset+44>: ldr     r2, [r1, #8]
0x8090 <warm_reset+48>: str     r2, [r0, #8]
0x8094 <warm_reset+52>: ldr     r2, [r1, #64]
0x8098 <warm_reset+56>: str     r2, [r0, #40]
0x809c <warm_reset+60>: swi     0x00000000
0x80a0 <start>: ldr     r0, [pc, #474]  ; 0x851c <.init_flag>
0x80a4 <start+4>:       ldr     r1, [r0]
0x80a8 <start+8>:       cmp     r1, #0  ; 0x0
0x80ac <start+12>:      bne     0x80a8 <start+8>
0x80b0 <start+16>:      ldr     r1, [pc, #c8]   ; 0x8180 <init_done>
0x80b4 <start+20>:      str     r1, [r0]
0x80b8 <start+24>:      mov     r0, #0  ; 0x0
0x80bc <start+28>:      ldr     r1, [pc, #454]  ; 0x8518 
<.__exception_handlers>
0x80c0 <start+32>:      cmp     r7, #19 ; 0x13
0x80c4 <start+36>:      beq     0x80d0 <start+48>
0x80c8 <start+40>:      ldr     r2, [r1, #40]
0x80cc <start+44>:      str     r2, [r0, #40]
0x80d0 <start+48>:      ldr     r2, [r1, #24]
0x80d4 <start+52>:      str     r2, [r0, #24]

  i am not able to do step or cont but using stepi i went through this 
startup function . It seems to loop around between 0x815c & 0x8164 and is 
not going ahead of that .
the code at this address is as follows :

0x8154  <start+180>:            cmp     r1, r2
-       0x8158  <start+184>:            beq     0x8168 <start+200>
-       0x815c  <start+188>:            str     r0, [r1], #4
-       0x8160  <start+192>:            cmp     r1, r2
-       0x8164  <start+196>:            bne     0x815c <start+188>
-       0x8168  <start+200>:            bl      0x1f194 <hal_hardware_init>
-       0x816c  <start+204>:            bl      0x1ee10 
<cyg_hal_invoke_constructors>
-       0x8170  <start+208>:            bl      0x1f358 <cyg_start>


umm when i do a break main , the reply is :

gdb) break main
Breakpoint 1 at 0x8558: file App.c

  Hoping to get an early reply from your side

thanks
danish.


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