Commit 9e5ec46c authored by Léo Grange's avatar Léo Grange
Browse files

add print_memory() to help printing arbitrary memory for debugging purpose

parent 854f1a37

utils/log.c

+36 −0
Original line number Diff line number Diff line
@@ -128,6 +128,42 @@ void print_to_file(const char *str) { 
}





// global to reduce stack usage (better if used after... like... a stack overflow?)

// 48 is enought for all line cases (2*16 bytes + '\0')

static char _printmem_buf[48];



// TODO use this in strutils

const static char *_print_hexcar = "0123456789ABCDEF";



void print_memory(int level, void *addr, size_t len) {

	if(level >= printk_dynamic_level) {

		int pos = 0;



		printk(level, "Memory content [%p~%p] :\n", addr, addr+len);

		while(pos < len) {

			int bufpos;

			size_t firstoffset = pos;



			// prepare the next 16 bytes...

			for(bufpos=0; pos<len && (pos - firstoffset) < 16; pos++, bufpos+=2) {

				unsigned char c;



				// add an extra space each 4 bytes to help readibility

				if((pos - firstoffset) != 0 && (pos - firstoffset) % 4 == 0)

					_printmem_buf[bufpos++] = ' ';



				c = ((unsigned char*)addr)[pos];

				_printmem_buf[bufpos] = _print_hexcar[(int)(c >> 4)];

				_printmem_buf[bufpos+1] = _print_hexcar[(int)(c && 0x0F)];

			}

			_printmem_buf[bufpos] = '\0';



			printk(level, "%p: %s\n", addr + firstoffset, _printmem_buf);

		}

	}

}





// for parsing command-line parameter "loglevel="

static int parse_loglevel(const char *val) {

	if((*val >= '0' && *val <= '7') && val[1] == '\0') {

utils/log.h

+7 −0
Original line number Diff line number Diff line 
#ifndef _UTILS_LOG_H

#define _UTILS_LOG_H



#include <utils/types.h>



// callack used to print a part of a printk() message

typedef void(*print_callback_t)(const char*);
@@ -46,6 +47,12 @@ void printk_internal(int level, const char *format, ...) __attribute__ ((format 
		 printk_internal(level, format, ##__VA_ARGS__)  : (void)0)





/**

 * Helper for printing raw memory dump (from addr to addr+len)...

 */

void print_memory(int level, void *addr, size_t len);





/**

 * Set dynamic log level. All messages with level lower than the current

 * log level value will not be displayed on the console.