Kevin O'Connor wrote:
> On Thu, Jul 05, 2007 at 01:46:30AM +0100, Pedro Alves wrote:
>> This is the part I was trying to get right with the macros:
>>
>>> __asm__(
>>> // Data to be placed at start of .text section
>>> "\t.section .init\n"
>>> "\t.word eh_handler\n"
>>> "\t.word 0\n"
>>> "start_eh_text:\n"
>>>
>> This is documented to having to be placed immediately before the function it
>> corresponds to ...
^^^
LOL this was supposed to be be a sentence finished below ...
> The trick here is that the default linker script will put sections
> labeled with ".init" into the very first part of .text.
>
... where I would comment that this is a nice hack. :)
> $ /opt/mingw32ce/bin/arm-wince-mingw32ce-objdump -Dr out/haret-debug
>
> Disassembly of section .text:
>
> 00011000 <___crt_xc_end__>:
> 11000: 000183b8 streqh r8, [r1], -r8
> 11004: 00000000 andeq r0, r0, r0
>
> 00011008 <WinMainCRTStartup>:
> 11008: e92d40f0 stmdb sp!, {r4, r5, r6, r7, lr}
> 1100c: e1a04000 mov r4, r0
> 11010: e1a05001 mov r5, r1
> [...]
>
> Disassembly of section .pdata:
>
> 00035000 <.pdata>:
> 35000: 00011008 andeq r1, r1, r8
> 35004: cfffff02 svcgt 0x00ffff02
>
>> Anyway,
>> Looks nice and simple, I'll give it a try tomorrow too. Thanks.
>
> Thanks. And thanks Danny for your code and comments as well.
>
> BTW, I've attached a newer version. I think I'll check this into
> haret's cvs if testing continues to look good.
>
> Sample usage:
>
> TRY_EXCEPTION_HANDLER
> {
> while (wcount--)
> *vaddr++ = value;
> }
> CATCH_EXCEPTION_HANDLER
> {
> Output(C_ERROR "EXCEPTION while writing %08x to address %p",
> value, vaddr);
> }
>
> I still don't know why I can't leave the exception handler with
> EXCEPTION_CONTINUE_EXECUTION..
>
I'll give that a shot tomorrow.
#define TRY_EXCEPTION_HANDLER \
struct eh_data __ehd; \
int __ret = setjmp(__ehd.env); \
if (!__ret) { \
start_ehandling(&__ehd);
#define CATCH_EXCEPTION_HANDLER \
end_ehandling(&__ehd); \
} else
Very nice. Hiding the __ehd would be great. If not possible
then I suggest at least adding ##__LINE__ to it.
#define TRY_EXCEPTION_HANDLER \
struct eh_data __ehd ## __LINE__ ; \
(...)
( TRY_SEH, CATCH_SEH seems shorter to type :) )
Cheers,
Pedro Alves
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