* assembly display -vs- popups
@ 2000-04-17 12:46 Tom Tromey
2000-04-17 12:58 ` James Ingham
0 siblings, 1 reply; 2+ messages in thread
From: Tom Tromey @ 2000-04-17 12:46 UTC (permalink / raw)
To: Insight List
While debugging my gcj-generated stubs I always use the assembly view,
because there isn't any source corresponding to the code I'm
debugging.
In assembly mode I see code like this (on my x86 box):
- 0x403077ca <simple_int.nat(int)+42>: mov %eax,0xfffffff8(%ebp)
If I highlight "%ebp", I'd like it to display the value of the
register in the balloon. Unfortunately, it does not, because "%ebp"
is not valid gdb syntax for getting the register value.
A hack would be to do `s/%/$/' to the expression in assembly mode.
This is bad because ideally I'd like to be able to highlight
0xfffffff8(%ebp) and have it do the right thing. Maybe assembly needs
a different expression evaluator, making this a more general gdb
problem?
Tom
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: assembly display -vs- popups
2000-04-17 12:46 assembly display -vs- popups Tom Tromey
@ 2000-04-17 12:58 ` James Ingham
0 siblings, 0 replies; 2+ messages in thread
From: James Ingham @ 2000-04-17 12:58 UTC (permalink / raw)
To: tromey; +Cc: Insight List
Tom,
> While debugging my gcj-generated stubs I always use the assembly view,
> because there isn't any source corresponding to the code I'm
> debugging.
>
> In assembly mode I see code like this (on my x86 box):
>
> - 0x403077ca <simple_int.nat(int)+42>: mov %eax,0xfffffff8(%ebp)
>
> If I highlight "%ebp", I'd like it to display the value of the
> register in the balloon. Unfortunately, it does not, because "%ebp"
> is not valid gdb syntax for getting the register value.
>
> A hack would be to do `s/%/$/' to the expression in assembly mode.
This makes me nervous. It is not guaranteed to work everywhere. Not
everybody uses % for registers in their standard dissassembler. On
MIPS a $ is used. Who knows what some other architecture might
choose... More importantly, there is no guarantee that replacing the
% with $ is benign...
>
> This is bad because ideally I'd like to be able to highlight
> 0xfffffff8(%ebp) and have it do the right thing. Maybe assembly needs
> a different expression evaluator, making this a more general gdb
> problem?
I think this is right; Insight just feeds whatever you highlight to
evaluate_expression... The problem is that gdb doesn't seem to
evaluate assembly expressions in the format used by the disassembler,
which certainly seems wrong to me.
Jim
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2000-04-17 12:46 assembly display -vs- popups Tom Tromey
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