crt.c

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#include "crt.h"
#include <stddef.h>
#include <stdint.h>
#include <string.h>

extern int __bss_start__;
extern int __bss_end__;
extern void (*__preinit_array_start[])(void) __attribute__((weak));
extern void (*__preinit_array_end[])(void) __attribute__((weak));
extern void (*__init_array_start[])(void) __attribute__((weak));
extern void (*__init_array_end[])(void) __attribute__((weak));
extern void (*__fini_array_start[])(void) __attribute__((weak));
extern void (*__fini_array_end[])(void) __attribute__((weak));

void __libc_init_array(void)
{
    size_t count = __preinit_array_end - __preinit_array_start;
    for(size_t i = 0; i < count; i++)
    {
        __preinit_array_start[i]();
    }

    count = __init_array_end - __init_array_start;
    for(size_t i = 0; i < count; i++)
    {
        __init_array_start[i]();
    }
}

void __libc_fini_array(void)
{
    size_t count = __fini_array_end - __fini_array_start;
    for(size_t i = count - 1; i > 0; i--)
    {
        __fini_array_start[i]();
    }
}

void CRTStartup(void)
{
    memset(&__bss_start__, 0, (uintptr_t)&__bss_end__ - (uintptr_t)&__bss_start__);

    __libc_init_array();

    // TODO: handle relocs?
}