[mirror_ubuntu-bionic-kernel.git] / arch / um / sys-ppc / miscthings.c

#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 */
Commit	Line	Data
37185b33 AV	1	#include <linux/threads.h>
	2	#include <linux/stddef.h> // for NULL
	3	#include <linux/elf.h> // for AT_NULL
1da177e4 LT	4
	5	/* The following function nicked from arch/ppc/kernel/process.c and
	6	* adapted slightly */
	7	/*
	8	* XXX ld.so expects the auxiliary table to start on
	9	* a 16-byte boundary, so we have to find it and
	10	* move it up. :-(
	11	*/
	12	void shove_aux_table(unsigned long sp)
	13	{
	14	int argc;
	15	char *p;
	16	unsigned long e;
	17	unsigned long aux_start, offset;
	18
	19	argc = (int )sp;
	20	sp += sizeof(int) + (argc + 1) * sizeof(char *);
	21	/* skip over the environment pointers */
	22	do {
	23	p = (char *)sp;
	24	sp += sizeof(char *);
	25	} while (p != NULL);
	26	aux_start = sp;
	27	/* skip to the end of the auxiliary table */
	28	do {
	29	e = (unsigned long )sp;
	30	sp += 2 * sizeof(unsigned long);
	31	} while (e != AT_NULL);
	32	offset = ((aux_start + 15) & ~15) - aux_start;
	33	if (offset != 0) {
	34	do {
	35	sp -= sizeof(unsigned long);
	36	e = (unsigned long )sp;
	37	(unsigned long )(sp + offset) = e;
	38	} while (sp > aux_start);
	39	}
	40	}
	41	/* END stuff taken from arch/ppc/kernel/process.c */
	42