Martin wrote:
On 31/08/2011 09:51, Mark Morgan Lloyd wrote:
Should this work from the assembler window? The buttons appear to step
to the next source line and manually setting a breakpoint by typing in
an address appears to work on some architectures (PPC) but not others
(SPARC).
Yes the button should do single step (whatever gdb belives a single
instruction step to be), if supported by gdb.
You can also assign keys (like alt-f8 alt-f7); or make the default f7/f8
focus sensitive (so they single-inst-step if the asm win has focus).
If it does not work for you, please open the "Debug output" window from
"view" / "debug windows" and check what command is sent to gdb.
I've been looking at this on various platforms. I can't easily test
Windows due to an apparent build problem, but on Linux and Solaris:
x86 (gtk2 and Qt): "Step into" (-> -exec-step-instruction) OK. "Step
Over" (-> -exec-next-instruction") OK. Intel-format assembler, formatted OK.
ARM (gtk2, emulated by Qemu, not susceptible to alignment errors):
Debugger access is erratic, works best if debug windows displayed before
program run. "Step into" (-> -exec-step-instruction) OK. "Step Over" (->
-exec-next-instruction") OK. Assembler window shows tabs as \t.
PPC (gtk2): "Step into" (-> -exec-step-instruction) OK. "Step Over" (->
-exec-next-instruction") runs to termination or until it finds an
explicit breakpoint. Assembler formatted OK.
SPARC (gtk2): "Step into" (-> -exec-step-instruction) appears to step
over the next instruction if it's a call, however this appears to be an
artifact of the way calls work (i.e. with a mandatory nop appended).
"Step Over" (-> -exec-next-instruction") OK provided that the above is
taken into consideration. Assembler window shows tabs as \t.
SPARC Solaris: as above.
Reliability in some cases might be improved by restarting Lazarus after
a debugging session, particularly if the target program hasn't run to
completion.
I think that the PPC problem is real, but if so it might be a gdb rather
than a Lazarus issue. Single-stepping SPARC assembler requires a good
understanding of the way calls work.
All 0.9.30.1 built with bigide using 2.4.4; Linux (Debian "Lenny" or
"Squeeze") using X over SSH.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
--
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