Re: Crash during function prologue
Re: Crash during function prologue
- Subject: Re: Crash during function prologue
- From: Chris Espinosa <email@hidden>
- Date: Sat, 6 Jan 2007 09:41:58 -0800
On Jan 6, 2007, at 9:27 AM, email@hidden wrote:
I'm a relatively new Xcode user, and I'm running into a crash
during the
function
prologue of one of my functions and I'm not quite sure how to go about
debugging
it. The last time I really looked at Assembly code was bout 20
years ago on
the 6502
in my old Apple IIe, so I'm more then a little rusty, but here's the
function up to the
point it crashes (this is PPC code, not x86):
0x0032cf10 <+0000> mflr r0
0x0032cf14 <+0004> stmw r29,-12(r1)
0x0032cf18 <+0008> stw r0,8(r1)
0x0032cf1c <+0012> lis r0,-9
0x0032cf20 <+0016> ori r0,r0,57648
0x0032cf24 <+0020> stwux r1,r1,r0
The crash is at the stwux, it's an EXC_BAD_ACCESS. At that point r1
(that's
the stack
pointer, right?) is 0xf0080230 and r0 is 0xfff7e130. Adding those
actually
overflows
32 bits, and the bad access is at 0xefffe360.
Looking at the Mac OS X ABI Function Call Guide, I figured the
initial part
is saving
the return address, which looks correct. And the later stuff is
setting up
the stack
frame. Since this is all compiler generated code though, I'm not
sure where
I need to
start attacking this. Any thoughts? Thanks!
If this is compiler-generated code then it would be more helpful to
see the source of the function, including the declaration of anything
it might be initializing in its prologue.
Chris
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