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