178 lines
3.3 KiB
C
178 lines
3.3 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
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printint(long long xx, int base, int sign)
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{
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char buf[16];
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int i;
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unsigned long long 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
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printptr(uint64 x)
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{
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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.
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int
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printf(char *fmt, ...)
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{
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va_list ap;
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int i, cx, c0, c1, c2, 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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va_start(ap, fmt);
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for(i = 0; (cx = fmt[i] & 0xff) != 0; i++){
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if(cx != '%'){
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consputc(cx);
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continue;
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}
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i++;
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c0 = fmt[i+0] & 0xff;
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c1 = c2 = 0;
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if(c0) c1 = fmt[i+1] & 0xff;
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if(c1) c2 = fmt[i+2] & 0xff;
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if(c0 == 'd'){
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printint(va_arg(ap, int), 10, 1);
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} else if(c0 == 'l' && c1 == 'd'){
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printint(va_arg(ap, uint64), 10, 1);
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i += 1;
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} else if(c0 == 'l' && c1 == 'l' && c2 == 'd'){
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printint(va_arg(ap, uint64), 10, 1);
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i += 2;
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} else if(c0 == 'u'){
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printint(va_arg(ap, int), 10, 0);
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} else if(c0 == 'l' && c1 == 'u'){
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printint(va_arg(ap, uint64), 10, 0);
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i += 1;
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} else if(c0 == 'l' && c1 == 'l' && c2 == 'u'){
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printint(va_arg(ap, uint64), 10, 0);
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i += 2;
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} else if(c0 == 'x'){
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printint(va_arg(ap, int), 16, 0);
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} else if(c0 == 'l' && c1 == 'x'){
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printint(va_arg(ap, uint64), 16, 0);
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i += 1;
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} else if(c0 == 'l' && c1 == 'l' && c2 == 'x'){
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printint(va_arg(ap, uint64), 16, 0);
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i += 2;
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} else if(c0 == 'p'){
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printptr(va_arg(ap, uint64));
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} else if(c0 == '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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} else if(c0 == '%'){
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consputc('%');
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} else if(c0 == 0){
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break;
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} else {
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// Print unknown % sequence to draw attention.
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consputc('%');
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consputc(c0);
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}
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#if 0
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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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#endif
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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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return 0;
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}
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void
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panic(char *s)
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{
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pr.locking = 0;
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printf("panic: ");
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printf("%s\n", s);
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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
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printfinit(void)
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{
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initlock(&pr.lock, "pr");
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pr.locking = 1;
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}
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