126 lines
2.0 KiB
C
126 lines
2.0 KiB
C
//
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// formatted console output -- printf, panic.
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//
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#include <stdarg.h>
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#include "types.h"
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#include "param.h"
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#include "spinlock.h"
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#include "sleeplock.h"
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#include "fs.h"
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#include "file.h"
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#include "memlayout.h"
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#include "riscv.h"
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#include "defs.h"
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#include "proc.h"
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volatile int panicked = 0;
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// lock to avoid interleaving concurrent printf's.
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static struct {
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struct spinlock lock;
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int locking;
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} pr;
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static char digits[] = "0123456789abcdef";
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static void printint(int xx, int base, int sign) {
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char buf[16];
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int i;
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uint x;
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if (sign && (sign = xx < 0))
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x = -xx;
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else
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x = xx;
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i = 0;
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do {
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buf[i++] = digits[x % base];
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} while ((x /= base) != 0);
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if (sign)
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buf[i++] = '-';
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while (--i >= 0)
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consputc(buf[i]);
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}
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static void printptr(uint64 x) {
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int i;
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consputc('0');
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consputc('x');
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for (i = 0; i < (sizeof(uint64) * 2); i++, x <<= 4)
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consputc(digits[x >> (sizeof(uint64) * 8 - 4)]);
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}
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// Print to the console. only understands %d, %x, %p, %s.
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void printf(char *fmt, ...) {
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va_list ap;
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int i, c, locking;
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char *s;
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locking = pr.locking;
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if (locking)
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acquire(&pr.lock);
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if (fmt == 0)
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panic("null fmt");
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va_start(ap, fmt);
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for (i = 0; (c = fmt[i] & 0xff) != 0; i++) {
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if (c != '%') {
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consputc(c);
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continue;
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}
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c = fmt[++i] & 0xff;
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if (c == 0)
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break;
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switch (c) {
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case 'd':
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printint(va_arg(ap, int), 10, 1);
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break;
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case 'x':
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printint(va_arg(ap, int), 16, 1);
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break;
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case 'p':
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printptr(va_arg(ap, uint64));
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break;
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case 's':
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if ((s = va_arg(ap, char *)) == 0)
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s = "(null)";
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for (; *s; s++)
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consputc(*s);
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break;
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case '%':
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consputc('%');
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break;
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default:
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// Print unknown % sequence to draw attention.
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consputc('%');
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consputc(c);
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break;
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}
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}
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va_end(ap);
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if (locking)
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release(&pr.lock);
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}
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void panic(char *s) {
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pr.locking = 0;
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printf("panic: ");
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printf(s);
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printf("\n");
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panicked = 1; // freeze uart output from other CPUs
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for (;;)
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;
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}
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void printfinit(void) {
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initlock(&pr.lock, "pr");
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pr.locking = 1;
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}
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