/* { dg-require-effective-target mmap } */
/* { dg-skip-if "the executable is at the same position the test tries to remap" { m68k-*-linux* } } */

#include <limits.h>

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifndef MAP_ANON
#ifdef MAP_ANONYMOUS
#define MAP_ANON MAP_ANONYMOUS
#else
#define MAP_ANON MAP_FILE
#endif
#endif
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#ifndef MAP_FIXED
#define MAP_FIXED 0
#endif

#define MAP_START (void *)0x7fff8000
#define MAP_LEN 0x10000

#define OFFSET (MAP_LEN/2 - 2 * sizeof (char));

void f(int s, char *p) {
    int i;
    for (i = s; i >= 0 && &p[i] < &p[40]; i++) {
        p[i] = -2;
    }
}

int main(void) {
#ifdef MAP_ANON
    char *p;
    int dev_zero;

    dev_zero = open("/dev/zero", O_RDONLY);
    /* -1 is OK when we have MAP_ANON; else mmap will flag an error.  */
    if (INT_MAX != 0x7fffffffL || sizeof(char *) != sizeof(int))
        return 0;
    p = mmap(MAP_START, MAP_LEN, PROT_READ | PROT_WRITE,
             MAP_ANON | MAP_FIXED | MAP_PRIVATE, dev_zero, 0);
    if (p != (char *)-1) {
        p += OFFSET;
        p[39] = 0;
        f(0, p);
        if (p[39] != (char)-2)
            __builtin_abort();
        p[39] = 0;
        f(-1, p);
        if (p[39] != 0)
            __builtin_abort();
    }
#endif
    return 0;
}
