smol-gilbraltar/nolibc/sysdeps.c

#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/times.h>

int errno;

#include <timer.h>
#include <serial.h>

/*
extern void gilbraltar_serial_write(const char *, size_t);
extern void gilbraltar_serial_puts(const char *);
extern uint32_t gilbraltar_system_clock(void);
*/

static size_t console_write(FILE *f __attribute__((unused)), const char *str, size_t len) {
  gilbraltar_serial_write(str, len);
  return (len);
}

static FILE console = { .write = console_write };
FILE *stderr = &console;
FILE *stdout = &console;

ssize_t write(int fd, const void *buf, size_t count) {
  if (fd == 1 || fd == 2) {
    gilbraltar_serial_write(buf, count);
    return (count);
  }
  errno = ENOSYS;
  return (-1);
}

void exit(int status) {
  while (1)
    __asm__ __volatile("wfi");
}

void abort(void) {
  gilbraltar_serial_puts("Aborted\r\n");

  while (1)
    __asm__ __volatile("wfi");
}

#if defined(__aarch64__)
int __getauxval(int unused) {
  errno = ENOENT;
  return (0);
}
#endif

clock_t times(struct tms *buf) {
  memset(buf, 0, sizeof(*buf));
  return ((clock_t) gilbraltar_system_clock());
}

#define NSEC_PER_SEC 1000000000ULL

int gettimeofday(struct timeval *tv, struct timezone *tz)
{
    if (tv != NULL) {
        uint32_t now = gilbraltar_system_clock();
        tv->tv_sec = now / NSEC_PER_SEC;
        tv->tv_usec = (now % NSEC_PER_SEC) / 1000ULL;
    }
    if (tz != NULL) {
        memset(tz, 0, sizeof(*tz));
    }
    return 0;
}