《操作系统》的实验代码。
Du kan inte välja fler än 25 ämnen Ämnen måste starta med en bokstav eller siffra, kan innehålla bindestreck ('-') och vara max 35 tecken långa.
 
 
 
 
 

132 rader
3.2 KiB

#include <stdio.h>
#include <string.h>
#include <mmu.h>
#include <trap.h>
#include <kmonitor.h>
#include <kdebug.h>
/* *
* Simple command-line kernel monitor useful for controlling the
* kernel and exploring the system interactively.
* */
struct command {
const char *name;
const char *desc;
// return -1 to force monitor to exit
int(*func)(int argc, char **argv, struct trapframe *tf);
};
static struct command commands[] = {
{"help", "Display this list of commands.", mon_help},
{"kerninfo", "Display information about the kernel.", mon_kerninfo},
{"backtrace", "Print backtrace of stack frame.", mon_backtrace},
};
/* return if kernel is panic, in kern/debug/panic.c */
bool is_kernel_panic(void);
#define NCOMMANDS (sizeof(commands)/sizeof(struct command))
/***** Kernel monitor command interpreter *****/
#define MAXARGS 16
#define WHITESPACE " \t\n\r"
/* parse - parse the command buffer into whitespace-separated arguments */
static int
parse(char *buf, char **argv) {
int argc = 0;
while (1) {
// find global whitespace
while (*buf != '\0' && strchr(WHITESPACE, *buf) != NULL) {
*buf ++ = '\0';
}
if (*buf == '\0') {
break;
}
// save and scan past next arg
if (argc == MAXARGS - 1) {
cprintf("Too many arguments (max %d).\n", MAXARGS);
}
argv[argc ++] = buf;
while (*buf != '\0' && strchr(WHITESPACE, *buf) == NULL) {
buf ++;
}
}
return argc;
}
/* *
* runcmd - parse the input string, split it into separated arguments
* and then lookup and invoke some related commands/
* */
static int
runcmd(char *buf, struct trapframe *tf) {
char *argv[MAXARGS];
int argc = parse(buf, argv);
if (argc == 0) {
return 0;
}
int i;
for (i = 0; i < NCOMMANDS; i ++) {
if (strcmp(commands[i].name, argv[0]) == 0) {
return commands[i].func(argc - 1, argv + 1, tf);
}
}
cprintf("Unknown command '%s'\n", argv[0]);
return 0;
}
/***** Implementations of basic kernel monitor commands *****/
void
kmonitor(struct trapframe *tf) {
cprintf("Welcome to the kernel debug monitor!!\n");
cprintf("Type 'help' for a list of commands.\n");
if (tf != NULL) {
print_trapframe(tf);
}
char *buf;
while (1) {
if ((buf = readline("K> ")) != NULL) {
if (runcmd(buf, tf) < 0) {
break;
}
}
}
}
/* mon_help - print the information about mon_* functions */
int
mon_help(int argc, char **argv, struct trapframe *tf) {
int i;
for (i = 0; i < NCOMMANDS; i ++) {
cprintf("%s - %s\n", commands[i].name, commands[i].desc);
}
return 0;
}
/* *
* mon_kerninfo - call print_kerninfo in kern/debug/kdebug.c to
* print the memory occupancy in kernel.
* */
int
mon_kerninfo(int argc, char **argv, struct trapframe *tf) {
print_kerninfo();
return 0;
}
/* *
* mon_backtrace - call print_stackframe in kern/debug/kdebug.c to
* print a backtrace of the stack.
* */
int
mon_backtrace(int argc, char **argv, struct trapframe *tf) {
print_stackframe();
return 0;
}