Unable to step over functions in arm-elf binary

[Colin MacDonald]

We have .elf targets for Arm processors and we can debug these via a remote connection (using the remote serial protocol) with Insight / GDB.  Everything works fine except for one thing: I can't step over a function.  If I try to step over a function I invariably step into it instead.  Using the 'n' command from GDB command line generates a sequence remote serial commands like this:

1. A breakpoint is set with $Z, but it's a breakpoint that I already have in the code
2. A series of $s and $p commands, step then check register, are executed, presumably hunting for the desired program counter value
3. Once the PC reaches the appropriate number I see a $m, probably to get a local variable value or something of the sort.
4. The breakpoint set in 1 is cleared with $z.

I was expecting that a breakpoint would be set temporarily at the next line of code then a $c (continue) would be issued.

Is this a known problem?  Does it only affect Arm targets, or is it only a problem using the remote serial protocol?  Any clues gratefully appreciated.

Colin MacDonald





		
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