Hi,
I have a question not directly related to Barebox but I think I can
find some answer here: )
I would like to use initcalls in a Linux user's land program on a x86 target.
I'm doing something like this:
#ifndef _INIT_H
#define _INIT_H
typedef int (*initcall_t)(void);
extern initcall_t __start_target, __stop_target;
#define target_initcall(fn) static initcall_t _##fn \
__attribute__((used)) \
__attribute__ ((section("target"))) = fn
#endif
then:
initcall_t *initcall;
for (initcall = &__start_target;
initcall < &__stop_target; initcall++) {
printf("initcall-> %p\n", *initcall);
ret = (*initcall)();
if (ret)
printf("initcall %p failed: %d\n", *initcall, ret);
}
Everything looks fine except the linker removes the function
"initcalled" because it is not
referenced anywhere and this is normal.
I have not modified the linker script (I'm using the default one). I'm
using auto generated
__start_target and __stop_target symbols generated by the linker.
My question is: why does it work in barebox ? For example, in
nios2/generic.c we have only
static function and initcalls. So why the linker does optimize out
those functions ? Is it
because we have initcall corresponding sections in the linker script ?
Thank you,
Franck.
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