Le Tue, 26 Feb 2008 20:56:32 +0200,
"Pekka Pessi" <[EMAIL PROTECTED]> a écrit :
> 2008/2/26, Alban Crequy <[EMAIL PROTECTED]>:
(...)
> > Any suggestions to fix the problem ?
>
> Check that you are linking correct runtime for your compiler.
> Could you generate asm with your GCC from a C file with function using
> non-zero array initializer like
>
> #include <sofia-sip/su_tag.h>
>
> tagi_t *tester(void)
> {
> tagi_t filter[2] = {{ NUTAG_ANY() }, { TAG_END() }};
> return tl_adup(NULL, filter);
> }
>
> and post it? I wonder if the generated code does memcpy from data
> segment, for instance, or initializes the array explicitly, and if
> there is some extra code that initializes the data segment in
> C++-manner, and if so, how it is supposed to be called (you might need
> to call such code explicitly).
I added the following function:
tagi_t *tester(void)
{
tagi_t filter[2] = {{ NUTAG_ANY() }, { TAG_END() }};
printf("%d\n", 0xdeadaaaa);
return tl_adup(NULL, filter);
}
I added the printf to find the function tester() in the disassembled
code.
and it generates the following code:
$ objdump -S -d -l -r --demangle test_nua.exe
4010c0: 55 push %ebp
4010c1: 89 e5 mov %esp,%ebp
4010c3: 56 push %esi
4010c4: 57 push %edi
4010c5: 83 ec 10 sub $0x10,%esp
4010c8: 51 push %ecx
4010c9: 8d 7c 24 04 lea 0x4(%esp),%edi
4010cd: b8 cc cc cc cc mov $0xcccccccc,%eax
4010d2: ab stos %eax,%es:(%edi)
4010d3: ab stos %eax,%es:(%edi)
4010d4: ab stos %eax,%es:(%edi)
4010d5: ab stos %eax,%es:(%edi)
4010d6: 59 pop %ecx
4010d7: 8d 7d e8 lea -0x18(%ebp),%edi
4010da: be 44 84 51 00 mov $0x518444,%esi
4010df: a5 movsl %ds:(%esi),%es:(%edi)
4010e0: a5 movsl %ds:(%esi),%es:(%edi)
4010e1: a5 movsl %ds:(%esi),%es:(%edi)
4010e2: a5 movsl %ds:(%esi),%es:(%edi)
4010e3: 68 aa aa ad de push $0xdeadaaaa
4010e8: 68 7e 84 51 00 push $0x51847e
4010ed: e8 76 40 11 00 call 0x515168
4010f2: 59 pop %ecx
4010f3: 59 pop %ecx
4010f4: 8d 45 e8 lea -0x18(%ebp),%eax
4010f7: 50 push %eax
4010f8: 6a 00 push $0x0
4010fa: ff 15 60 ba 52 00 call *0x52ba60
401100: 59 pop %ecx
401101: 59 pop %ecx
401102: 89 c0 mov %eax,%eax
401104: 8d 65 f8 lea -0x8(%ebp),%esp
401107: 5f pop %edi
401108: 5e pop %esi
401109: 5d pop %ebp
40110a: c3 ret
I am not sure to understand, but it seems to initialize with the value
from $0x518444.
--
Alban
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