Hi
> I would like an assembler (or offset map) of task_struct. It is defined in
> sched.h with quite a few subdefinitions.
>
> How can I request this of GCC (or AS)?
None that I know. However, it might give you idea:
$ cat coba.c
#include<stdio.h>
typedef struct
{
float a;
int b;
} mystruct;
static mystruct this_struct;
int main(int argc, char * argv[])
{
this_struct.a=0.1;
this_struct.b=2;
printf("%.2f \n",this_struct.a);
printf("%d \n",this_struct.b);
return 0;
}
$ gcc -ggdb -O0 -W -Wall -o coba coba.c
$ objdump -d -S ./coba
...
this_struct.a=0.1;
8048384: b8 cd cc cc 3d mov $0x3dcccccd,%eax
8048389: a3 c8 95 04 08 mov %eax,0x80495c8
this_struct.b=2;
804838e: c7 05 cc 95 04 08 02 movl $0x2,0x80495cc
8048395: 00 00 00
...
$ nm -B -S ./coba | grep this_struct
080495c8 00000008 b this_struct
So, this_struct is 8 byte size. "a" is located in 0x080495c8 and
0x80495cc ( offset 4 byte from the start of "this_struct"). Pay
attention that I use "static" thus this struct is placed in .bss.
Finally, we can get the picture:
this_struct --- a (offset 0)
+-----------------b (offset 4)
Surely, alignment and the usage of "packed" do matter here. So does
the optimization flags.
regards,
Mulyadi.
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