qemu/tests/tcg/cris/bare/sys.c

/*
 * Helper functions for CRIS system tests
 *
 * There is no libc and only a limited set of headers.
 */

#include <stddef.h>

void exit(int status)
{
    register unsigned int callno asm ("r9") = 1; /* NR_exit */

    asm volatile ("break 13\n"
                  : /* no outputs */
                  : "r" (callno)
                  : "memory");
    while (1) {
        /* do nothing */
    };
}

size_t write(int fd, const void *buf, size_t count)
{
    register unsigned int callno asm ("r9") = 4; /* NR_write */
    register unsigned int r10 asm ("r10") = fd;
    register const void *r11 asm ("r11") = buf;
    register size_t r12 asm ("r12") = count;
    register unsigned int r asm ("r10");

    asm volatile ("break 13\n"
                  : "=r" (r)
                  : "r" (callno), "0" (r10), "r" (r11), "r" (r12)
                  : "memory");

    return r;
}

static inline int mystrlen(char *s)
{
    int i = 0;
    while (s[i]) {
        i++;
    }
    return i;
}


void pass(void)
{
    char s[] = "passed.\n";
    write(1, s, sizeof(s) - 1);
    exit(0);
}

void _fail(char *reason)
{
    char s[] = "\nfailed: ";
    int len = mystrlen(reason);
    write(1, s, sizeof(s) - 1);
    write(1, reason, len);
    write(1, "\n", 1);
    exit(1);
}