miscthings.c

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#include <linux/threads.h>
#include <linux/stddef.h>  // for NULL
#include <linux/elf.h>  // for AT_NULL

/* The following function nicked from arch/ppc/kernel/process.c and
 * adapted slightly */
/*
 * XXX ld.so expects the auxiliary table to start on
 * a 16-byte boundary, so we have to find it and
 * move it up. :-(
 */
void shove_aux_table(unsigned long sp)
{
    int argc;
    char *p;
    unsigned long e;
    unsigned long aux_start, offset;

    argc = *(int *)sp;
    sp += sizeof(int) + (argc + 1) * sizeof(char *);
    /* skip over the environment pointers */
    do {
        p = *(char **)sp;
        sp += sizeof(char *);
    } while (p != NULL);
    aux_start = sp;
    /* skip to the end of the auxiliary table */
    do {
        e = *(unsigned long *)sp;
        sp += 2 * sizeof(unsigned long);
    } while (e != AT_NULL);
    offset = ((aux_start + 15) & ~15) - aux_start;
    if (offset != 0) {
        do {
            sp -= sizeof(unsigned long);
            e = *(unsigned long *)sp;
            *(unsigned long *)(sp + offset) = e;
        } while (sp > aux_start);
    }
}
/* END stuff taken from arch/ppc/kernel/process.c */