I've done some more experiments. 1. I didn't get an exception from division by 0. Inspection of the assembly code reveals that there's indeed no division instruction being generated (probably this means ARM doesn't do integer division?). The function called is divdf3, which comes from dp-bit.c in gcc. That code explicitly checks for a 0 divider, it doesn't appear to cause strangeness like an exception.
2. Pedro asked why I used a dialog, wouldn't a printf statement be
better, he mentioned console applications.
I've tried to build a "console" version of my follow-a-null-pointer
application using the old voxware compiler. I used that toolchain
because I don't think ours can handle a console application that
can be launched from the rlogin session.
The console application died as expected, showing messages that appear
to come from the _eh_handler_ :
# np.exe
Exception: Code:c0000005 Flags:0 Addr:11060 SP:2009fb44 LR:11054 R0:0
R1:29150 R2:2 R3:0 R4:2009fb64 R5:2009fc7c R12:1 FP:2009fb4c
Exception: Code:c0000005 Flags:0 Addr:11060 SP:2009fb44 LR:16194
R0:ffffffff R1:0 R2:24be49ba R3:0 R4:c0000005 R5:0 R12:1 FP:2009fb4c
Exception: Code:80000002 Flags:0 Addr:16198 SP:2009fb44 LR:16194
R0:ffffffff R1:0 R2:24be49ba R3:86 R4:c0000005 R5:ffffffff R12:1
FP:2009fb4c
#
Interestingly, the divide-by-zero application (which pops up a dialog
after the division by 0) shows a dialog on my PDA's screen, even
though it was launched as a console application (from the rlogin
session).
Note that the exceptions above mean :
#define STATUS_ACCESS_VIOLATION ((DWORD)0xC0000005L)
#define STATUS_DATATYPE_MISALIGNMENT ((DWORD)0x80000002L)
3. An application run without my modified _eh_handler_ prints messages
like these in /temp/wcetrace*.log.
4. I have an application that mysteriously dies when you ask it too
much. I was hoping to get some info from this handler, but I have yet
to find any error message.
When I run it under gdb, all that happens is :
Program received signal SIGSEGV, Segmentation fault.
0x01758f58 in ?? ()
(gdb) where
#0 0x01758f58 in ?? ()
(gdb)
Danny
--
Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info
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