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Re: [avr-gcc-list] avr-as and debugging symbols
From: |
manders1 |
Subject: |
Re: [avr-gcc-list] avr-as and debugging symbols |
Date: |
Tue, 1 Jul 2003 06:30:45 -0400 |
> In article <address@hidden> you write:
>
> >Here's some output from "avr-gcc -S -g test.c" that shows
> >the syntax I was trying to assemble.
>
> Except of the extraneous line breaks apparently introduced by your
> news/mail software, this is supposed to work. I've successfully used
> own .stabs data type definitions like this myself:
>
> .stabs "unsigned int:t1=r1;0;65535;",128,0,0,0
> .stabs "unsigned char:t2=r2;0;255;",128,0,0,0
> .stabs "unsigned
> long:t3=r3;0000000000000;0037777777777;",128,0,0,0
> ..
>
> .section .bss
> .global adcptr
> .stabs "adcptr:G10=*1",32,0,0,0
> adcptr: .word 0
>
> In a C context, this would be
>
> int *adcptr;
>
> What's the exact error message you're getting (including the line
> number it refers to)?
>
> --
> J"org Wunsch Unix support engineer
> address@hidden http://www.interface-systems.de/~j/
I went back and tried to reproduce the problem but
was unable to get an error message. However, what
I still don't understand is that if I declare some
.stabs like those above they do not seem to appear
in the object or executable images, I tried using
avr-objdump and avr-readelf to no avail. I even
tried strings but found nothing. OTOH, if I use
avr-objdump on an object created by avr-gcc I can
see some information but not what I expect.
For instance, here is an excerpt from the output of
"avr-gcc -g -S" from the .s file:
.stabs "gcc2_compiled.",60,0,0,0
.stabs "int:t(0,1)=r(0,1);-32768;32767;",128,0,0,0
.stabs "char:t(0,2)=r(0,2);0;127;",128,0,0,0
However, these symbols don't appear in the executable
when doing an "avr-objdump -g". What does appear are
things like:
typedef int16 int;
typedef int8 char;
typedef int32 long int;
The debugging information reported by these programs
doesn't seem to bear a resemblance to what the source
assembly code shows.
--
mark anderson
address@hidden