kdb: core for kgdb back end (2 of 2)
This patch contains the hooks and instrumentation into kernel which live outside the kernel/debug directory, which the kdb core will call to run commands like lsmod, dmesg, bt etc... CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
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5d5314d679
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@ -20,6 +20,7 @@ enum km_type {
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KM_SOFTIRQ1,
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KM_L1_CACHE,
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KM_L2_CACHE,
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KM_KDB,
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KM_TYPE_NR
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};
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@ -26,6 +26,7 @@ enum km_type {
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KM_SOFTIRQ1,
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KM_PPC_SYNC_PAGE,
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KM_PPC_SYNC_ICACHE,
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KM_KDB,
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KM_TYPE_NR
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};
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@ -28,7 +28,8 @@ KMAP_D(15) KM_UML_USERCOPY,
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KMAP_D(16) KM_IRQ_PTE,
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KMAP_D(17) KM_NMI,
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KMAP_D(18) KM_NMI_PTE,
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KMAP_D(19) KM_TYPE_NR
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KMAP_D(19) KM_KDB,
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KMAP_D(20) KM_TYPE_NR
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};
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#undef KMAP_D
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@ -62,6 +62,7 @@
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/idr.h>
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#include <linux/kdb.h>
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#include <linux/ftrace.h>
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#include <linux/async.h>
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#include <linux/kmemcheck.h>
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@ -675,6 +676,7 @@ asmlinkage void __init start_kernel(void)
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buffer_init();
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key_init();
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security_init();
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kdb_init(KDB_INIT_FULL);
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vfs_caches_init(totalram_pages);
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signals_init();
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/* rootfs populating might need page-writeback */
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@ -16,6 +16,7 @@
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/fs.h>
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#include <linux/kdb.h>
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#include <linux/err.h>
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#include <linux/proc_fs.h>
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#include <linux/sched.h> /* for cond_resched */
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@ -516,6 +517,26 @@ static int kallsyms_open(struct inode *inode, struct file *file)
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return ret;
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}
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#ifdef CONFIG_KGDB_KDB
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const char *kdb_walk_kallsyms(loff_t *pos)
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{
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static struct kallsym_iter kdb_walk_kallsyms_iter;
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if (*pos == 0) {
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memset(&kdb_walk_kallsyms_iter, 0,
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sizeof(kdb_walk_kallsyms_iter));
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reset_iter(&kdb_walk_kallsyms_iter, 0);
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}
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while (1) {
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if (!update_iter(&kdb_walk_kallsyms_iter, *pos))
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return NULL;
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++*pos;
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/* Some debugging symbols have no name. Ignore them. */
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if (kdb_walk_kallsyms_iter.name[0])
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return kdb_walk_kallsyms_iter.name;
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}
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}
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#endif /* CONFIG_KGDB_KDB */
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static const struct file_operations kallsyms_operations = {
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.open = kallsyms_open,
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.read = seq_read,
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@ -77,6 +77,10 @@
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DEFINE_MUTEX(module_mutex);
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EXPORT_SYMBOL_GPL(module_mutex);
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static LIST_HEAD(modules);
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#ifdef CONFIG_KGDB_KDB
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struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
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#endif /* CONFIG_KGDB_KDB */
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/* Block module loading/unloading? */
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int modules_disabled = 0;
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@ -413,6 +413,22 @@ SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
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return do_syslog(type, buf, len, SYSLOG_FROM_CALL);
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}
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#ifdef CONFIG_KGDB_KDB
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/* kdb dmesg command needs access to the syslog buffer. do_syslog()
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* uses locks so it cannot be used during debugging. Just tell kdb
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* where the start and end of the physical and logical logs are. This
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* is equivalent to do_syslog(3).
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*/
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void kdb_syslog_data(char *syslog_data[4])
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{
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syslog_data[0] = log_buf;
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syslog_data[1] = log_buf + log_buf_len;
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syslog_data[2] = log_buf + log_end -
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(logged_chars < log_buf_len ? logged_chars : log_buf_len);
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syslog_data[3] = log_buf + log_end;
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}
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#endif /* CONFIG_KGDB_KDB */
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/*
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* Call the console drivers on a range of log_buf
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*/
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@ -7758,9 +7758,9 @@ void normalize_rt_tasks(void)
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#endif /* CONFIG_MAGIC_SYSRQ */
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#ifdef CONFIG_IA64
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#if defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB)
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/*
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* These functions are only useful for the IA64 MCA handling.
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* These functions are only useful for the IA64 MCA handling, or kdb.
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*
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* They can only be called when the whole system has been
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* stopped - every CPU needs to be quiescent, and no scheduling
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@ -7780,6 +7780,9 @@ struct task_struct *curr_task(int cpu)
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return cpu_curr(cpu);
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}
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#endif /* defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB) */
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#ifdef CONFIG_IA64
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/**
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* set_curr_task - set the current task for a given cpu.
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* @cpu: the processor in question.
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@ -2735,3 +2735,43 @@ void __init signals_init(void)
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{
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sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
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}
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#ifdef CONFIG_KGDB_KDB
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#include <linux/kdb.h>
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/*
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* kdb_send_sig_info - Allows kdb to send signals without exposing
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* signal internals. This function checks if the required locks are
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* available before calling the main signal code, to avoid kdb
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* deadlocks.
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*/
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void
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kdb_send_sig_info(struct task_struct *t, struct siginfo *info)
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{
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static struct task_struct *kdb_prev_t;
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int sig, new_t;
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if (!spin_trylock(&t->sighand->siglock)) {
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kdb_printf("Can't do kill command now.\n"
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"The sigmask lock is held somewhere else in "
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"kernel, try again later\n");
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return;
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}
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spin_unlock(&t->sighand->siglock);
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new_t = kdb_prev_t != t;
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kdb_prev_t = t;
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if (t->state != TASK_RUNNING && new_t) {
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kdb_printf("Process is not RUNNING, sending a signal from "
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"kdb risks deadlock\n"
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"on the run queue locks. "
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"The signal has _not_ been sent.\n"
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"Reissue the kill command if you want to risk "
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"the deadlock.\n");
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return;
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}
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sig = info->si_signo;
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if (send_sig_info(sig, info, t))
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kdb_printf("Fail to deliver Signal %d to process %d.\n",
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sig, t->pid);
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else
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kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);
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}
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#endif /* CONFIG_KGDB_KDB */
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