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12#include <linux/ctype.h>
13#include <linux/string.h>
14#include <linux/kernel.h>
15#include <linux/sched.h>
16#include <linux/kdb.h>
17#include <linux/nmi.h>
18#include "kdb_private.h"
19
20
21static void kdb_show_stack(struct task_struct *p, void *addr)
22{
23 int old_lvl = console_loglevel;
24 console_loglevel = 15;
25 kdb_trap_printk++;
26 kdb_set_current_task(p);
27 if (addr) {
28 show_stack((struct task_struct *)p, addr);
29 } else if (kdb_current_regs) {
30#ifdef CONFIG_X86
31 show_stack(p, &kdb_current_regs->sp);
32#else
33 show_stack(p, NULL);
34#endif
35 } else {
36 show_stack(p, NULL);
37 }
38 console_loglevel = old_lvl;
39 kdb_trap_printk--;
40}
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79static int
80kdb_bt1(struct task_struct *p, unsigned long mask,
81 int argcount, int btaprompt)
82{
83 char buffer[2];
84 if (kdb_getarea(buffer[0], (unsigned long)p) ||
85 kdb_getarea(buffer[0], (unsigned long)(p+1)-1))
86 return KDB_BADADDR;
87 if (!kdb_task_state(p, mask))
88 return 0;
89 kdb_printf("Stack traceback for pid %d\n", p->pid);
90 kdb_ps1(p);
91 kdb_show_stack(p, NULL);
92 if (btaprompt) {
93 kdb_getstr(buffer, sizeof(buffer),
94 "Enter <q> to end, <cr> to continue:");
95 if (buffer[0] == 'q') {
96 kdb_printf("\n");
97 return 1;
98 }
99 }
100 touch_nmi_watchdog();
101 return 0;
102}
103
104int
105kdb_bt(int argc, const char **argv)
106{
107 int diag;
108 int argcount = 5;
109 int btaprompt = 1;
110 int nextarg;
111 unsigned long addr;
112 long offset;
113
114
115 kdbgetintenv("BTAPROMPT", &btaprompt);
116
117 if (strcmp(argv[0], "bta") == 0) {
118 struct task_struct *g, *p;
119 unsigned long cpu;
120 unsigned long mask = kdb_task_state_string(argc ? argv[1] :
121 NULL);
122 if (argc == 0)
123 kdb_ps_suppressed();
124
125 for_each_online_cpu(cpu) {
126 p = kdb_curr_task(cpu);
127 if (kdb_bt1(p, mask, argcount, btaprompt))
128 return 0;
129 }
130
131 kdb_do_each_thread(g, p) {
132 if (KDB_FLAG(CMD_INTERRUPT))
133 return 0;
134 if (task_curr(p))
135 continue;
136 if (kdb_bt1(p, mask, argcount, btaprompt))
137 return 0;
138 } kdb_while_each_thread(g, p);
139 } else if (strcmp(argv[0], "btp") == 0) {
140 struct task_struct *p;
141 unsigned long pid;
142 if (argc != 1)
143 return KDB_ARGCOUNT;
144 diag = kdbgetularg((char *)argv[1], &pid);
145 if (diag)
146 return diag;
147 p = find_task_by_pid_ns(pid, &init_pid_ns);
148 if (p) {
149 kdb_set_current_task(p);
150 return kdb_bt1(p, ~0UL, argcount, 0);
151 }
152 kdb_printf("No process with pid == %ld found\n", pid);
153 return 0;
154 } else if (strcmp(argv[0], "btt") == 0) {
155 if (argc != 1)
156 return KDB_ARGCOUNT;
157 diag = kdbgetularg((char *)argv[1], &addr);
158 if (diag)
159 return diag;
160 kdb_set_current_task((struct task_struct *)addr);
161 return kdb_bt1((struct task_struct *)addr, ~0UL, argcount, 0);
162 } else if (strcmp(argv[0], "btc") == 0) {
163 unsigned long cpu = ~0;
164 struct task_struct *save_current_task = kdb_current_task;
165 char buf[80];
166 if (argc > 1)
167 return KDB_ARGCOUNT;
168 if (argc == 1) {
169 diag = kdbgetularg((char *)argv[1], &cpu);
170 if (diag)
171 return diag;
172 }
173
174
175 argv = NULL;
176 if (cpu != ~0) {
177 if (cpu >= num_possible_cpus() || !cpu_online(cpu)) {
178 kdb_printf("no process for cpu %ld\n", cpu);
179 return 0;
180 }
181 sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
182 kdb_parse(buf);
183 return 0;
184 }
185 kdb_printf("btc: cpu status: ");
186 kdb_parse("cpu\n");
187 for_each_online_cpu(cpu) {
188 sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
189 kdb_parse(buf);
190 touch_nmi_watchdog();
191 }
192 kdb_set_current_task(save_current_task);
193 return 0;
194 } else {
195 if (argc) {
196 nextarg = 1;
197 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
198 &offset, NULL);
199 if (diag)
200 return diag;
201 kdb_show_stack(kdb_current_task, (void *)addr);
202 return 0;
203 } else {
204 return kdb_bt1(kdb_current_task, ~0UL, argcount, 0);
205 }
206 }
207
208
209 return 0;
210}
211