+++ /dev/null
-/*
- * drivers/staging/android/fiq_debugger.c
- *
- * Serial Debugger Interface accessed through an FIQ interrupt.
- *
- * Copyright (C) 2008 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#include <stdarg.h>
-#include <linux/module.h>
-#include <linux/io.h>
-#include <linux/console.h>
-#include <linux/interrupt.h>
-#include <linux/clk.h>
-#include <linux/platform_device.h>
-#include <linux/kernel_stat.h>
-#include <linux/kmsg_dump.h>
-#include <linux/irq.h>
-#include <linux/delay.h>
-#include <linux/reboot.h>
-#include <linux/sched/signal.h>
-#include <linux/slab.h>
-#include <linux/smp.h>
-#include <linux/timer.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-
-#ifdef CONFIG_FIQ_GLUE
-#include <asm/fiq_glue.h>
-#endif
-
-#ifdef CONFIG_FIQ_DEBUGGER_UART_OVERLAY
-#include <linux/of.h>
-#endif
-
-#include <linux/uaccess.h>
-
-#include "fiq_debugger.h"
-#include "fiq_debugger_priv.h"
-#include "fiq_debugger_ringbuf.h"
-
-#define DEBUG_MAX 64
-#define MAX_UNHANDLED_FIQ_COUNT 1000000
-
-#define MAX_FIQ_DEBUGGER_PORTS 4
-
-struct fiq_debugger_state {
-#ifdef CONFIG_FIQ_GLUE
- struct fiq_glue_handler handler;
-#endif
- struct fiq_debugger_output output;
-
- int fiq;
- int uart_irq;
- int signal_irq;
- int wakeup_irq;
- bool wakeup_irq_no_set_wake;
- struct clk *clk;
- struct fiq_debugger_pdata *pdata;
- struct platform_device *pdev;
-
- char debug_cmd[DEBUG_MAX];
- int debug_busy;
- int debug_abort;
-
- char debug_buf[DEBUG_MAX];
- int debug_count;
-
- bool no_sleep;
- bool debug_enable;
- bool ignore_next_wakeup_irq;
- struct timer_list sleep_timer;
- spinlock_t sleep_timer_lock;
- bool uart_enabled;
- struct wakeup_source debugger_wake_src;
- bool console_enable;
- int current_cpu;
- atomic_t unhandled_fiq_count;
- bool in_fiq;
-
- struct work_struct work;
- spinlock_t work_lock;
- char work_cmd[DEBUG_MAX];
-
-#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
- spinlock_t console_lock;
- struct console console;
- struct tty_port tty_port;
- struct fiq_debugger_ringbuf *tty_rbuf;
- bool syslog_dumping;
-#endif
-
- unsigned int last_irqs[NR_IRQS];
- unsigned int last_local_timer_irqs[NR_CPUS];
-};
-
-#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
-struct tty_driver *fiq_tty_driver;
-#endif
-
-#ifdef CONFIG_FIQ_DEBUGGER_NO_SLEEP
-static bool initial_no_sleep = true;
-#else
-static bool initial_no_sleep;
-#endif
-
-#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE_DEFAULT_ENABLE
-static bool initial_debug_enable = true;
-static bool initial_console_enable = true;
-#else
-static bool initial_debug_enable;
-static bool initial_console_enable;
-#endif
-
-static bool fiq_kgdb_enable;
-static bool fiq_debugger_disable;
-
-module_param_named(no_sleep, initial_no_sleep, bool, 0644);
-module_param_named(debug_enable, initial_debug_enable, bool, 0644);
-module_param_named(console_enable, initial_console_enable, bool, 0644);
-module_param_named(kgdb_enable, fiq_kgdb_enable, bool, 0644);
-module_param_named(disable, fiq_debugger_disable, bool, 0644);
-
-#ifdef CONFIG_FIQ_DEBUGGER_WAKEUP_IRQ_ALWAYS_ON
-static inline
-void fiq_debugger_enable_wakeup_irq(struct fiq_debugger_state *state) {}
-static inline
-void fiq_debugger_disable_wakeup_irq(struct fiq_debugger_state *state) {}
-#else
-static inline
-void fiq_debugger_enable_wakeup_irq(struct fiq_debugger_state *state)
-{
- if (state->wakeup_irq < 0)
- return;
- enable_irq(state->wakeup_irq);
- if (!state->wakeup_irq_no_set_wake)
- enable_irq_wake(state->wakeup_irq);
-}
-static inline
-void fiq_debugger_disable_wakeup_irq(struct fiq_debugger_state *state)
-{
- if (state->wakeup_irq < 0)
- return;
- disable_irq_nosync(state->wakeup_irq);
- if (!state->wakeup_irq_no_set_wake)
- disable_irq_wake(state->wakeup_irq);
-}
-#endif
-
-static inline bool fiq_debugger_have_fiq(struct fiq_debugger_state *state)
-{
- return (state->fiq >= 0);
-}
-
-#ifdef CONFIG_FIQ_GLUE
-static void fiq_debugger_force_irq(struct fiq_debugger_state *state)
-{
- unsigned int irq = state->signal_irq;
-
- if (WARN_ON(!fiq_debugger_have_fiq(state)))
- return;
- if (state->pdata->force_irq) {
- state->pdata->force_irq(state->pdev, irq);
- } else {
- struct irq_chip *chip = irq_get_chip(irq);
- if (chip && chip->irq_retrigger)
- chip->irq_retrigger(irq_get_irq_data(irq));
- }
-}
-#endif
-
-static void fiq_debugger_uart_enable(struct fiq_debugger_state *state)
-{
- if (state->clk)
- clk_enable(state->clk);
- if (state->pdata->uart_enable)
- state->pdata->uart_enable(state->pdev);
-}
-
-static void fiq_debugger_uart_disable(struct fiq_debugger_state *state)
-{
- if (state->pdata->uart_disable)
- state->pdata->uart_disable(state->pdev);
- if (state->clk)
- clk_disable(state->clk);
-}
-
-static void fiq_debugger_uart_flush(struct fiq_debugger_state *state)
-{
- if (state->pdata->uart_flush)
- state->pdata->uart_flush(state->pdev);
-}
-
-static void fiq_debugger_putc(struct fiq_debugger_state *state, char c)
-{
- state->pdata->uart_putc(state->pdev, c);
-}
-
-static void fiq_debugger_puts(struct fiq_debugger_state *state, char *s)
-{
- unsigned c;
- while ((c = *s++)) {
- if (c == '\n')
- fiq_debugger_putc(state, '\r');
- fiq_debugger_putc(state, c);
- }
-}
-
-static void fiq_debugger_prompt(struct fiq_debugger_state *state)
-{
- fiq_debugger_puts(state, "debug> ");
-}
-
-static void fiq_debugger_dump_kernel_log(struct fiq_debugger_state *state)
-{
- char buf[512];
- size_t len;
- struct kmsg_dumper dumper = { .active = true };
-
-
- kmsg_dump_rewind_nolock(&dumper);
- while (kmsg_dump_get_line_nolock(&dumper, true, buf,
- sizeof(buf) - 1, &len)) {
- buf[len] = 0;
- fiq_debugger_puts(state, buf);
- }
-}
-
-static void fiq_debugger_printf(struct fiq_debugger_output *output,
- const char *fmt, ...)
-{
- struct fiq_debugger_state *state;
- char buf[256];
- va_list ap;
-
- state = container_of(output, struct fiq_debugger_state, output);
- va_start(ap, fmt);
- vsnprintf(buf, sizeof(buf), fmt, ap);
- va_end(ap);
-
- fiq_debugger_puts(state, buf);
-}
-
-/* Safe outside fiq context */
-static int fiq_debugger_printf_nfiq(void *cookie, const char *fmt, ...)
-{
- struct fiq_debugger_state *state = cookie;
- char buf[256];
- va_list ap;
- unsigned long irq_flags;
-
- va_start(ap, fmt);
- vsnprintf(buf, 128, fmt, ap);
- va_end(ap);
-
- local_irq_save(irq_flags);
- fiq_debugger_puts(state, buf);
- fiq_debugger_uart_flush(state);
- local_irq_restore(irq_flags);
- return state->debug_abort;
-}
-
-static void fiq_debugger_dump_irqs(struct fiq_debugger_state *state)
-{
- int n;
- struct irq_desc *desc;
-
- fiq_debugger_printf(&state->output,
- "irqnr total since-last status name\n");
- for_each_irq_desc(n, desc) {
- struct irqaction *act = desc->action;
- if (!act && !kstat_irqs(n))
- continue;
- fiq_debugger_printf(&state->output, "%5d: %10u %11u %8x %s\n", n,
- kstat_irqs(n),
- kstat_irqs(n) - state->last_irqs[n],
- desc->status_use_accessors,
- (act && act->name) ? act->name : "???");
- state->last_irqs[n] = kstat_irqs(n);
- }
-}
-
-static void fiq_debugger_do_ps(struct fiq_debugger_state *state)
-{
- struct task_struct *g;
- struct task_struct *p;
- unsigned task_state;
- static const char stat_nam[] = "RSDTtZX";
-
- fiq_debugger_printf(&state->output, "pid ppid prio task pc\n");
- read_lock(&tasklist_lock);
- do_each_thread(g, p) {
- task_state = p->state ? __ffs(p->state) + 1 : 0;
- fiq_debugger_printf(&state->output,
- "%5d %5d %4d ", p->pid, p->parent->pid, p->prio);
- fiq_debugger_printf(&state->output, "%-13.13s %c", p->comm,
- task_state >= sizeof(stat_nam) ? '?' : stat_nam[task_state]);
- if (task_state == TASK_RUNNING)
- fiq_debugger_printf(&state->output, " running\n");
- else
- fiq_debugger_printf(&state->output, " %08lx\n",
- thread_saved_pc(p));
- } while_each_thread(g, p);
- read_unlock(&tasklist_lock);
-}
-
-#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
-static void fiq_debugger_begin_syslog_dump(struct fiq_debugger_state *state)
-{
- state->syslog_dumping = true;
-}
-
-static void fiq_debugger_end_syslog_dump(struct fiq_debugger_state *state)
-{
- state->syslog_dumping = false;
-}
-#else
-extern int do_syslog(int type, char __user *bug, int count);
-static void fiq_debugger_begin_syslog_dump(struct fiq_debugger_state *state)
-{
- do_syslog(5 /* clear */, NULL, 0);
-}
-
-static void fiq_debugger_end_syslog_dump(struct fiq_debugger_state *state)
-{
- fiq_debugger_dump_kernel_log(state);
-}
-#endif
-
-static void fiq_debugger_do_sysrq(struct fiq_debugger_state *state, char rq)
-{
- if ((rq == 'g' || rq == 'G') && !fiq_kgdb_enable) {
- fiq_debugger_printf(&state->output, "sysrq-g blocked\n");
- return;
- }
- fiq_debugger_begin_syslog_dump(state);
- handle_sysrq(rq);
- fiq_debugger_end_syslog_dump(state);
-}
-
-#ifdef CONFIG_KGDB
-static void fiq_debugger_do_kgdb(struct fiq_debugger_state *state)
-{
- if (!fiq_kgdb_enable) {
- fiq_debugger_printf(&state->output, "kgdb through fiq debugger not enabled\n");
- return;
- }
-
- fiq_debugger_printf(&state->output, "enabling console and triggering kgdb\n");
- state->console_enable = true;
- handle_sysrq('g');
-}
-#endif
-
-static void fiq_debugger_schedule_work(struct fiq_debugger_state *state,
- char *cmd)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&state->work_lock, flags);
- if (state->work_cmd[0] != '\0') {
- fiq_debugger_printf(&state->output, "work command processor busy\n");
- spin_unlock_irqrestore(&state->work_lock, flags);
- return;
- }
-
- strlcpy(state->work_cmd, cmd, sizeof(state->work_cmd));
- spin_unlock_irqrestore(&state->work_lock, flags);
-
- schedule_work(&state->work);
-}
-
-static void fiq_debugger_work(struct work_struct *work)
-{
- struct fiq_debugger_state *state;
- char work_cmd[DEBUG_MAX];
- char *cmd;
- unsigned long flags;
-
- state = container_of(work, struct fiq_debugger_state, work);
-
- spin_lock_irqsave(&state->work_lock, flags);
-
- strlcpy(work_cmd, state->work_cmd, sizeof(work_cmd));
- state->work_cmd[0] = '\0';
-
- spin_unlock_irqrestore(&state->work_lock, flags);
-
- cmd = work_cmd;
- if (!strncmp(cmd, "reboot", 6)) {
- cmd += 6;
- while (*cmd == ' ')
- cmd++;
- if (*cmd != '\0')
- kernel_restart(cmd);
- else
- kernel_restart(NULL);
- } else {
- fiq_debugger_printf(&state->output, "unknown work command '%s'\n",
- work_cmd);
- }
-}
-
-/* This function CANNOT be called in FIQ context */
-static void fiq_debugger_irq_exec(struct fiq_debugger_state *state, char *cmd)
-{
- if (!strcmp(cmd, "ps"))
- fiq_debugger_do_ps(state);
- if (!strcmp(cmd, "sysrq"))
- fiq_debugger_do_sysrq(state, 'h');
- if (!strncmp(cmd, "sysrq ", 6))
- fiq_debugger_do_sysrq(state, cmd[6]);
-#ifdef CONFIG_KGDB
- if (!strcmp(cmd, "kgdb"))
- fiq_debugger_do_kgdb(state);
-#endif
- if (!strncmp(cmd, "reboot", 6))
- fiq_debugger_schedule_work(state, cmd);
-}
-
-static void fiq_debugger_help(struct fiq_debugger_state *state)
-{
- fiq_debugger_printf(&state->output,
- "FIQ Debugger commands:\n"
- " pc PC status\n"
- " regs Register dump\n"
- " allregs Extended Register dump\n"
- " bt Stack trace\n"
- " reboot [<c>] Reboot with command <c>\n"
- " reset [<c>] Hard reset with command <c>\n"
- " irqs Interupt status\n"
- " kmsg Kernel log\n"
- " version Kernel version\n");
- fiq_debugger_printf(&state->output,
- " sleep Allow sleep while in FIQ\n"
- " nosleep Disable sleep while in FIQ\n"
- " console Switch terminal to console\n"
- " cpu Current CPU\n"
- " cpu <number> Switch to CPU<number>\n");
- fiq_debugger_printf(&state->output,
- " ps Process list\n"
- " sysrq sysrq options\n"
- " sysrq <param> Execute sysrq with <param>\n");
-#ifdef CONFIG_KGDB
- fiq_debugger_printf(&state->output,
- " kgdb Enter kernel debugger\n");
-#endif
-}
-
-static void fiq_debugger_take_affinity(void *info)
-{
- struct fiq_debugger_state *state = info;
- struct cpumask cpumask;
-
- cpumask_clear(&cpumask);
- cpumask_set_cpu(get_cpu(), &cpumask);
-
- irq_set_affinity(state->uart_irq, &cpumask);
-}
-
-static void fiq_debugger_switch_cpu(struct fiq_debugger_state *state, int cpu)
-{
- if (!fiq_debugger_have_fiq(state))
- smp_call_function_single(cpu, fiq_debugger_take_affinity, state,
- false);
- state->current_cpu = cpu;
-}
-
-static bool fiq_debugger_fiq_exec(struct fiq_debugger_state *state,
- const char *cmd, const struct pt_regs *regs,
- void *svc_sp)
-{
- bool signal_helper = false;
-
- if (!strcmp(cmd, "help") || !strcmp(cmd, "?")) {
- fiq_debugger_help(state);
- } else if (!strcmp(cmd, "pc")) {
- fiq_debugger_dump_pc(&state->output, regs);
- } else if (!strcmp(cmd, "regs")) {
- fiq_debugger_dump_regs(&state->output, regs);
- } else if (!strcmp(cmd, "allregs")) {
- fiq_debugger_dump_allregs(&state->output, regs);
- } else if (!strcmp(cmd, "bt")) {
- fiq_debugger_dump_stacktrace(&state->output, regs, 100, svc_sp);
- } else if (!strncmp(cmd, "reset", 5)) {
- cmd += 5;
- while (*cmd == ' ')
- cmd++;
- if (*cmd) {
- char tmp_cmd[32];
- strlcpy(tmp_cmd, cmd, sizeof(tmp_cmd));
- machine_restart(tmp_cmd);
- } else {
- machine_restart(NULL);
- }
- } else if (!strcmp(cmd, "irqs")) {
- fiq_debugger_dump_irqs(state);
- } else if (!strcmp(cmd, "kmsg")) {
- fiq_debugger_dump_kernel_log(state);
- } else if (!strcmp(cmd, "version")) {
- fiq_debugger_printf(&state->output, "%s\n", linux_banner);
- } else if (!strcmp(cmd, "sleep")) {
- state->no_sleep = false;
- fiq_debugger_printf(&state->output, "enabling sleep\n");
- } else if (!strcmp(cmd, "nosleep")) {
- state->no_sleep = true;
- fiq_debugger_printf(&state->output, "disabling sleep\n");
- } else if (!strcmp(cmd, "console")) {
- fiq_debugger_printf(&state->output, "console mode\n");
- fiq_debugger_uart_flush(state);
- state->console_enable = true;
- } else if (!strcmp(cmd, "cpu")) {
- fiq_debugger_printf(&state->output, "cpu %d\n", state->current_cpu);
- } else if (!strncmp(cmd, "cpu ", 4)) {
- unsigned long cpu = 0;
- if (kstrtoul(cmd + 4, 10, &cpu) == 0)
- fiq_debugger_switch_cpu(state, cpu);
- else
- fiq_debugger_printf(&state->output, "invalid cpu\n");
- fiq_debugger_printf(&state->output, "cpu %d\n", state->current_cpu);
- } else {
- if (state->debug_busy) {
- fiq_debugger_printf(&state->output,
- "command processor busy. trying to abort.\n");
- state->debug_abort = -1;
- } else {
- strcpy(state->debug_cmd, cmd);
- state->debug_busy = 1;
- }
-
- return true;
- }
- if (!state->console_enable)
- fiq_debugger_prompt(state);
-
- return signal_helper;
-}
-
-static void fiq_debugger_sleep_timer_expired(unsigned long data)
-{
- struct fiq_debugger_state *state = (struct fiq_debugger_state *)data;
- unsigned long flags;
-
- spin_lock_irqsave(&state->sleep_timer_lock, flags);
- if (state->uart_enabled && !state->no_sleep) {
- if (state->debug_enable && !state->console_enable) {
- state->debug_enable = false;
- fiq_debugger_printf_nfiq(state,
- "suspending fiq debugger\n");
- }
- state->ignore_next_wakeup_irq = true;
- fiq_debugger_uart_disable(state);
- state->uart_enabled = false;
- fiq_debugger_enable_wakeup_irq(state);
- }
- __pm_relax(&state->debugger_wake_src);
- spin_unlock_irqrestore(&state->sleep_timer_lock, flags);
-}
-
-static void fiq_debugger_handle_wakeup(struct fiq_debugger_state *state)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&state->sleep_timer_lock, flags);
- if (state->wakeup_irq >= 0 && state->ignore_next_wakeup_irq) {
- state->ignore_next_wakeup_irq = false;
- } else if (!state->uart_enabled) {
- __pm_stay_awake(&state->debugger_wake_src);
- fiq_debugger_uart_enable(state);
- state->uart_enabled = true;
- fiq_debugger_disable_wakeup_irq(state);
- mod_timer(&state->sleep_timer, jiffies + HZ / 2);
- }
- spin_unlock_irqrestore(&state->sleep_timer_lock, flags);
-}
-
-static irqreturn_t fiq_debugger_wakeup_irq_handler(int irq, void *dev)
-{
- struct fiq_debugger_state *state = dev;
-
- if (!state->no_sleep)
- fiq_debugger_puts(state, "WAKEUP\n");
- fiq_debugger_handle_wakeup(state);
-
- return IRQ_HANDLED;
-}
-
-static
-void fiq_debugger_handle_console_irq_context(struct fiq_debugger_state *state)
-{
-#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
- if (state->tty_port.ops) {
- int i;
- int count = fiq_debugger_ringbuf_level(state->tty_rbuf);
- for (i = 0; i < count; i++) {
- int c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0);
- tty_insert_flip_char(&state->tty_port, c, TTY_NORMAL);
- if (!fiq_debugger_ringbuf_consume(state->tty_rbuf, 1))
- pr_warn("fiq tty failed to consume byte\n");
- }
- tty_flip_buffer_push(&state->tty_port);
- }
-#endif
-}
-
-static void fiq_debugger_handle_irq_context(struct fiq_debugger_state *state)
-{
- if (!state->no_sleep) {
- unsigned long flags;
-
- spin_lock_irqsave(&state->sleep_timer_lock, flags);
- __pm_stay_awake(&state->debugger_wake_src);
- mod_timer(&state->sleep_timer, jiffies + HZ * 5);
- spin_unlock_irqrestore(&state->sleep_timer_lock, flags);
- }
- fiq_debugger_handle_console_irq_context(state);
- if (state->debug_busy) {
- fiq_debugger_irq_exec(state, state->debug_cmd);
- if (!state->console_enable)
- fiq_debugger_prompt(state);
- state->debug_busy = 0;
- }
-}
-
-static int fiq_debugger_getc(struct fiq_debugger_state *state)
-{
- return state->pdata->uart_getc(state->pdev);
-}
-
-static bool fiq_debugger_handle_uart_interrupt(struct fiq_debugger_state *state,
- int this_cpu, const struct pt_regs *regs, void *svc_sp)
-{
- int c;
- static int last_c;
- int count = 0;
- bool signal_helper = false;
-
- if (this_cpu != state->current_cpu) {
- if (state->in_fiq)
- return false;
-
- if (atomic_inc_return(&state->unhandled_fiq_count) !=
- MAX_UNHANDLED_FIQ_COUNT)
- return false;
-
- fiq_debugger_printf(&state->output,
- "fiq_debugger: cpu %d not responding, "
- "reverting to cpu %d\n", state->current_cpu,
- this_cpu);
-
- atomic_set(&state->unhandled_fiq_count, 0);
- fiq_debugger_switch_cpu(state, this_cpu);
- return false;
- }
-
- state->in_fiq = true;
-
- while ((c = fiq_debugger_getc(state)) != FIQ_DEBUGGER_NO_CHAR) {
- count++;
- if (!state->debug_enable) {
- if ((c == 13) || (c == 10)) {
- state->debug_enable = true;
- state->debug_count = 0;
- fiq_debugger_prompt(state);
- }
- } else if (c == FIQ_DEBUGGER_BREAK) {
- state->console_enable = false;
- fiq_debugger_puts(state, "fiq debugger mode\n");
- state->debug_count = 0;
- fiq_debugger_prompt(state);
-#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
- } else if (state->console_enable && state->tty_rbuf) {
- fiq_debugger_ringbuf_push(state->tty_rbuf, c);
- signal_helper = true;
-#endif
- } else if ((c >= ' ') && (c < 127)) {
- if (state->debug_count < (DEBUG_MAX - 1)) {
- state->debug_buf[state->debug_count++] = c;
- fiq_debugger_putc(state, c);
- }
- } else if ((c == 8) || (c == 127)) {
- if (state->debug_count > 0) {
- state->debug_count--;
- fiq_debugger_putc(state, 8);
- fiq_debugger_putc(state, ' ');
- fiq_debugger_putc(state, 8);
- }
- } else if ((c == 13) || (c == 10)) {
- if (c == '\r' || (c == '\n' && last_c != '\r')) {
- fiq_debugger_putc(state, '\r');
- fiq_debugger_putc(state, '\n');
- }
- if (state->debug_count) {
- state->debug_buf[state->debug_count] = 0;
- state->debug_count = 0;
- signal_helper |=
- fiq_debugger_fiq_exec(state,
- state->debug_buf,
- regs, svc_sp);
- } else {
- fiq_debugger_prompt(state);
- }
- }
- last_c = c;
- }
- if (!state->console_enable)
- fiq_debugger_uart_flush(state);
- if (state->pdata->fiq_ack)
- state->pdata->fiq_ack(state->pdev, state->fiq);
-
- /* poke sleep timer if necessary */
- if (state->debug_enable && !state->no_sleep)
- signal_helper = true;
-
- atomic_set(&state->unhandled_fiq_count, 0);
- state->in_fiq = false;
-
- return signal_helper;
-}
-
-#ifdef CONFIG_FIQ_GLUE
-static void fiq_debugger_fiq(struct fiq_glue_handler *h,
- const struct pt_regs *regs, void *svc_sp)
-{
- struct fiq_debugger_state *state =
- container_of(h, struct fiq_debugger_state, handler);
- unsigned int this_cpu = THREAD_INFO(svc_sp)->cpu;
- bool need_irq;
-
- need_irq = fiq_debugger_handle_uart_interrupt(state, this_cpu, regs,
- svc_sp);
- if (need_irq)
- fiq_debugger_force_irq(state);
-}
-#endif
-
-/*
- * When not using FIQs, we only use this single interrupt as an entry point.
- * This just effectively takes over the UART interrupt and does all the work
- * in this context.
- */
-static irqreturn_t fiq_debugger_uart_irq(int irq, void *dev)
-{
- struct fiq_debugger_state *state = dev;
- bool not_done;
-
- fiq_debugger_handle_wakeup(state);
-
- /* handle the debugger irq in regular context */
- not_done = fiq_debugger_handle_uart_interrupt(state, smp_processor_id(),
- get_irq_regs(),
- current_thread_info());
- if (not_done)
- fiq_debugger_handle_irq_context(state);
-
- return IRQ_HANDLED;
-}
-
-/*
- * If FIQs are used, not everything can happen in fiq context.
- * FIQ handler does what it can and then signals this interrupt to finish the
- * job in irq context.
- */
-static irqreturn_t fiq_debugger_signal_irq(int irq, void *dev)
-{
- struct fiq_debugger_state *state = dev;
-
- if (state->pdata->force_irq_ack)
- state->pdata->force_irq_ack(state->pdev, state->signal_irq);
-
- fiq_debugger_handle_irq_context(state);
-
- return IRQ_HANDLED;
-}
-
-#ifdef CONFIG_FIQ_GLUE
-static void fiq_debugger_resume(struct fiq_glue_handler *h)
-{
- struct fiq_debugger_state *state =
- container_of(h, struct fiq_debugger_state, handler);
- if (state->pdata->uart_resume)
- state->pdata->uart_resume(state->pdev);
-}
-#endif
-
-#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
-struct tty_driver *fiq_debugger_console_device(struct console *co, int *index)
-{
- *index = co->index;
- return fiq_tty_driver;
-}
-
-static void fiq_debugger_console_write(struct console *co,
- const char *s, unsigned int count)
-{
- struct fiq_debugger_state *state;
- unsigned long flags;
-
- state = container_of(co, struct fiq_debugger_state, console);
-
- if (!state->console_enable && !state->syslog_dumping)
- return;
-
- fiq_debugger_uart_enable(state);
- spin_lock_irqsave(&state->console_lock, flags);
- while (count--) {
- if (*s == '\n')
- fiq_debugger_putc(state, '\r');
- fiq_debugger_putc(state, *s++);
- }
- fiq_debugger_uart_flush(state);
- spin_unlock_irqrestore(&state->console_lock, flags);
- fiq_debugger_uart_disable(state);
-}
-
-static struct console fiq_debugger_console = {
- .name = "ttyFIQ",
- .device = fiq_debugger_console_device,
- .write = fiq_debugger_console_write,
- .flags = CON_PRINTBUFFER | CON_ANYTIME | CON_ENABLED,
-};
-
-int fiq_tty_open(struct tty_struct *tty, struct file *filp)
-{
- int line = tty->index;
- struct fiq_debugger_state **states = tty->driver->driver_state;
- struct fiq_debugger_state *state = states[line];
-
- return tty_port_open(&state->tty_port, tty, filp);
-}
-
-void fiq_tty_close(struct tty_struct *tty, struct file *filp)
-{
- tty_port_close(tty->port, tty, filp);
-}
-
-int fiq_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
-{
- int i;
- int line = tty->index;
- struct fiq_debugger_state **states = tty->driver->driver_state;
- struct fiq_debugger_state *state = states[line];
-
- if (!state->console_enable)
- return count;
-
- fiq_debugger_uart_enable(state);
- spin_lock_irq(&state->console_lock);
- for (i = 0; i < count; i++)
- fiq_debugger_putc(state, *buf++);
- spin_unlock_irq(&state->console_lock);
- fiq_debugger_uart_disable(state);
-
- return count;
-}
-
-int fiq_tty_write_room(struct tty_struct *tty)
-{
- return 16;
-}
-
-#ifdef CONFIG_CONSOLE_POLL
-static int fiq_tty_poll_init(struct tty_driver *driver, int line, char *options)
-{
- return 0;
-}
-
-static int fiq_tty_poll_get_char(struct tty_driver *driver, int line)
-{
- struct fiq_debugger_state **states = driver->driver_state;
- struct fiq_debugger_state *state = states[line];
- int c = NO_POLL_CHAR;
-
- fiq_debugger_uart_enable(state);
- if (fiq_debugger_have_fiq(state)) {
- int count = fiq_debugger_ringbuf_level(state->tty_rbuf);
- if (count > 0) {
- c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0);
- fiq_debugger_ringbuf_consume(state->tty_rbuf, 1);
- }
- } else {
- c = fiq_debugger_getc(state);
- if (c == FIQ_DEBUGGER_NO_CHAR)
- c = NO_POLL_CHAR;
- }
- fiq_debugger_uart_disable(state);
-
- return c;
-}
-
-static void fiq_tty_poll_put_char(struct tty_driver *driver, int line, char ch)
-{
- struct fiq_debugger_state **states = driver->driver_state;
- struct fiq_debugger_state *state = states[line];
- fiq_debugger_uart_enable(state);
- fiq_debugger_putc(state, ch);
- fiq_debugger_uart_disable(state);
-}
-#endif
-
-static const struct tty_port_operations fiq_tty_port_ops;
-
-static const struct tty_operations fiq_tty_driver_ops = {
- .write = fiq_tty_write,
- .write_room = fiq_tty_write_room,
- .open = fiq_tty_open,
- .close = fiq_tty_close,
-#ifdef CONFIG_CONSOLE_POLL
- .poll_init = fiq_tty_poll_init,
- .poll_get_char = fiq_tty_poll_get_char,
- .poll_put_char = fiq_tty_poll_put_char,
-#endif
-};
-
-static int fiq_debugger_tty_init(void)
-{
- int ret;
- struct fiq_debugger_state **states = NULL;
-
- states = kzalloc(sizeof(*states) * MAX_FIQ_DEBUGGER_PORTS, GFP_KERNEL);
- if (!states) {
- pr_err("Failed to allocate fiq debugger state structres\n");
- return -ENOMEM;
- }
-
- fiq_tty_driver = alloc_tty_driver(MAX_FIQ_DEBUGGER_PORTS);
- if (!fiq_tty_driver) {
- pr_err("Failed to allocate fiq debugger tty\n");
- ret = -ENOMEM;
- goto err_free_state;
- }
-
- fiq_tty_driver->owner = THIS_MODULE;
- fiq_tty_driver->driver_name = "fiq-debugger";
- fiq_tty_driver->name = "ttyFIQ";
- fiq_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
- fiq_tty_driver->subtype = SERIAL_TYPE_NORMAL;
- fiq_tty_driver->init_termios = tty_std_termios;
- fiq_tty_driver->flags = TTY_DRIVER_REAL_RAW |
- TTY_DRIVER_DYNAMIC_DEV;
- fiq_tty_driver->driver_state = states;
-
- fiq_tty_driver->init_termios.c_cflag =
- B115200 | CS8 | CREAD | HUPCL | CLOCAL;
- fiq_tty_driver->init_termios.c_ispeed = 115200;
- fiq_tty_driver->init_termios.c_ospeed = 115200;
-
- tty_set_operations(fiq_tty_driver, &fiq_tty_driver_ops);
-
- ret = tty_register_driver(fiq_tty_driver);
- if (ret) {
- pr_err("Failed to register fiq tty: %d\n", ret);
- goto err_free_tty;
- }
-
- pr_info("Registered FIQ tty driver\n");
- return 0;
-
-err_free_tty:
- put_tty_driver(fiq_tty_driver);
- fiq_tty_driver = NULL;
-err_free_state:
- kfree(states);
- return ret;
-}
-
-static int fiq_debugger_tty_init_one(struct fiq_debugger_state *state)
-{
- int ret;
- struct device *tty_dev;
- struct fiq_debugger_state **states = fiq_tty_driver->driver_state;
-
- states[state->pdev->id] = state;
-
- state->tty_rbuf = fiq_debugger_ringbuf_alloc(1024);
- if (!state->tty_rbuf) {
- pr_err("Failed to allocate fiq debugger ringbuf\n");
- ret = -ENOMEM;
- goto err;
- }
-
- tty_port_init(&state->tty_port);
- state->tty_port.ops = &fiq_tty_port_ops;
-
- tty_dev = tty_port_register_device(&state->tty_port, fiq_tty_driver,
- state->pdev->id, &state->pdev->dev);
- if (IS_ERR(tty_dev)) {
- pr_err("Failed to register fiq debugger tty device\n");
- ret = PTR_ERR(tty_dev);
- goto err;
- }
-
- device_set_wakeup_capable(tty_dev, 1);
-
- pr_info("Registered fiq debugger ttyFIQ%d\n", state->pdev->id);
-
- return 0;
-
-err:
- fiq_debugger_ringbuf_free(state->tty_rbuf);
- state->tty_rbuf = NULL;
- return ret;
-}
-#endif
-
-static int fiq_debugger_dev_suspend(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct fiq_debugger_state *state = platform_get_drvdata(pdev);
-
- if (state->pdata->uart_dev_suspend)
- return state->pdata->uart_dev_suspend(pdev);
- return 0;
-}
-
-static int fiq_debugger_dev_resume(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct fiq_debugger_state *state = platform_get_drvdata(pdev);
-
- if (state->pdata->uart_dev_resume)
- return state->pdata->uart_dev_resume(pdev);
- return 0;
-}
-
-static int fiq_debugger_probe(struct platform_device *pdev)
-{
- int ret;
- struct fiq_debugger_pdata *pdata = dev_get_platdata(&pdev->dev);
- struct fiq_debugger_state *state;
- int fiq;
- int uart_irq;
-
- if (pdev->id >= MAX_FIQ_DEBUGGER_PORTS)
- return -EINVAL;
-
- if (!pdata->uart_getc || !pdata->uart_putc)
- return -EINVAL;
- if ((pdata->uart_enable && !pdata->uart_disable) ||
- (!pdata->uart_enable && pdata->uart_disable))
- return -EINVAL;
-
- fiq = platform_get_irq_byname(pdev, "fiq");
- uart_irq = platform_get_irq_byname(pdev, "uart_irq");
-
- /* uart_irq mode and fiq mode are mutually exclusive, but one of them
- * is required */
- if ((uart_irq < 0 && fiq < 0) || (uart_irq >= 0 && fiq >= 0))
- return -EINVAL;
- if (fiq >= 0 && !pdata->fiq_enable)
- return -EINVAL;
-
- state = kzalloc(sizeof(*state), GFP_KERNEL);
- state->output.printf = fiq_debugger_printf;
- setup_timer(&state->sleep_timer, fiq_debugger_sleep_timer_expired,
- (unsigned long)state);
- state->pdata = pdata;
- state->pdev = pdev;
- state->no_sleep = initial_no_sleep;
- state->debug_enable = initial_debug_enable;
- state->console_enable = initial_console_enable;
-
- state->fiq = fiq;
- state->uart_irq = uart_irq;
- state->signal_irq = platform_get_irq_byname(pdev, "signal");
- state->wakeup_irq = platform_get_irq_byname(pdev, "wakeup");
-
- INIT_WORK(&state->work, fiq_debugger_work);
- spin_lock_init(&state->work_lock);
-
- platform_set_drvdata(pdev, state);
-
- spin_lock_init(&state->sleep_timer_lock);
-
- if (state->wakeup_irq < 0 && fiq_debugger_have_fiq(state))
- state->no_sleep = true;
- state->ignore_next_wakeup_irq = !state->no_sleep;
-
- wakeup_source_init(&state->debugger_wake_src, "serial-debug");
-
- state->clk = clk_get(&pdev->dev, NULL);
- if (IS_ERR(state->clk))
- state->clk = NULL;
-
- /* do not call pdata->uart_enable here since uart_init may still
- * need to do some initialization before uart_enable can work.
- * So, only try to manage the clock during init.
- */
- if (state->clk)
- clk_enable(state->clk);
-
- if (pdata->uart_init) {
- ret = pdata->uart_init(pdev);
- if (ret)
- goto err_uart_init;
- }
-
- fiq_debugger_printf_nfiq(state,
- "<hit enter %sto activate fiq debugger>\n",
- state->no_sleep ? "" : "twice ");
-
-#ifdef CONFIG_FIQ_GLUE
- if (fiq_debugger_have_fiq(state)) {
- state->handler.fiq = fiq_debugger_fiq;
- state->handler.resume = fiq_debugger_resume;
- ret = fiq_glue_register_handler(&state->handler);
- if (ret) {
- pr_err("%s: could not install fiq handler\n", __func__);
- goto err_register_irq;
- }
-
- pdata->fiq_enable(pdev, state->fiq, 1);
- } else
-#endif
- {
- ret = request_irq(state->uart_irq, fiq_debugger_uart_irq,
- IRQF_NO_SUSPEND, "debug", state);
- if (ret) {
- pr_err("%s: could not install irq handler\n", __func__);
- goto err_register_irq;
- }
-
- /* for irq-only mode, we want this irq to wake us up, if it
- * can.
- */
- enable_irq_wake(state->uart_irq);
- }
-
- if (state->clk)
- clk_disable(state->clk);
-
- if (state->signal_irq >= 0) {
- ret = request_irq(state->signal_irq, fiq_debugger_signal_irq,
- IRQF_TRIGGER_RISING, "debug-signal", state);
- if (ret)
- pr_err("serial_debugger: could not install signal_irq");
- }
-
- if (state->wakeup_irq >= 0) {
- ret = request_irq(state->wakeup_irq,
- fiq_debugger_wakeup_irq_handler,
- IRQF_TRIGGER_FALLING,
- "debug-wakeup", state);
- if (ret) {
- pr_err("serial_debugger: "
- "could not install wakeup irq\n");
- state->wakeup_irq = -1;
- } else {
- ret = enable_irq_wake(state->wakeup_irq);
- if (ret) {
- pr_err("serial_debugger: "
- "could not enable wakeup\n");
- state->wakeup_irq_no_set_wake = true;
- }
- }
- }
- if (state->no_sleep)
- fiq_debugger_handle_wakeup(state);
-
-#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
- spin_lock_init(&state->console_lock);
- state->console = fiq_debugger_console;
- state->console.index = pdev->id;
- if (!console_set_on_cmdline)
- add_preferred_console(state->console.name,
- state->console.index, NULL);
- register_console(&state->console);
- fiq_debugger_tty_init_one(state);
-#endif
- return 0;
-
-err_register_irq:
- if (pdata->uart_free)
- pdata->uart_free(pdev);
-err_uart_init:
- if (state->clk)
- clk_disable(state->clk);
- if (state->clk)
- clk_put(state->clk);
- wakeup_source_trash(&state->debugger_wake_src);
- platform_set_drvdata(pdev, NULL);
- kfree(state);
- return ret;
-}
-
-static const struct dev_pm_ops fiq_debugger_dev_pm_ops = {
- .suspend = fiq_debugger_dev_suspend,
- .resume = fiq_debugger_dev_resume,
-};
-
-static struct platform_driver fiq_debugger_driver = {
- .probe = fiq_debugger_probe,
- .driver = {
- .name = "fiq_debugger",
- .pm = &fiq_debugger_dev_pm_ops,
- },
-};
-
-#if defined(CONFIG_FIQ_DEBUGGER_UART_OVERLAY)
-int fiq_debugger_uart_overlay(void)
-{
- struct device_node *onp = of_find_node_by_path("/uart_overlay@0");
- int ret;
-
- if (!onp) {
- pr_err("serial_debugger: uart overlay not found\n");
- return -ENODEV;
- }
-
- ret = of_overlay_create(onp);
- if (ret < 0) {
- pr_err("serial_debugger: fail to create overlay: %d\n", ret);
- of_node_put(onp);
- return ret;
- }
-
- pr_info("serial_debugger: uart overlay applied\n");
- return 0;
-}
-#endif
-
-static int __init fiq_debugger_init(void)
-{
- if (fiq_debugger_disable) {
- pr_err("serial_debugger: disabled\n");
- return -ENODEV;
- }
-#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
- fiq_debugger_tty_init();
-#endif
-#if defined(CONFIG_FIQ_DEBUGGER_UART_OVERLAY)
- fiq_debugger_uart_overlay();
-#endif
- return platform_driver_register(&fiq_debugger_driver);
-}
-
-postcore_initcall(fiq_debugger_init);
+++ /dev/null
-/*
- * Copyright (C) 2014 Google, Inc.
- * Author: Colin Cross <ccross@android.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#include <linux/ptrace.h>
-#include <linux/uaccess.h>
-
-#include <asm/stacktrace.h>
-
-#include "fiq_debugger_priv.h"
-
-static char *mode_name(unsigned cpsr)
-{
- switch (cpsr & MODE_MASK) {
- case USR_MODE: return "USR";
- case FIQ_MODE: return "FIQ";
- case IRQ_MODE: return "IRQ";
- case SVC_MODE: return "SVC";
- case ABT_MODE: return "ABT";
- case UND_MODE: return "UND";
- case SYSTEM_MODE: return "SYS";
- default: return "???";
- }
-}
-
-void fiq_debugger_dump_pc(struct fiq_debugger_output *output,
- const struct pt_regs *regs)
-{
- output->printf(output, " pc %08x cpsr %08x mode %s\n",
- regs->ARM_pc, regs->ARM_cpsr, mode_name(regs->ARM_cpsr));
-}
-
-void fiq_debugger_dump_regs(struct fiq_debugger_output *output,
- const struct pt_regs *regs)
-{
- output->printf(output,
- " r0 %08x r1 %08x r2 %08x r3 %08x\n",
- regs->ARM_r0, regs->ARM_r1, regs->ARM_r2, regs->ARM_r3);
- output->printf(output,
- " r4 %08x r5 %08x r6 %08x r7 %08x\n",
- regs->ARM_r4, regs->ARM_r5, regs->ARM_r6, regs->ARM_r7);
- output->printf(output,
- " r8 %08x r9 %08x r10 %08x r11 %08x mode %s\n",
- regs->ARM_r8, regs->ARM_r9, regs->ARM_r10, regs->ARM_fp,
- mode_name(regs->ARM_cpsr));
- output->printf(output,
- " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n",
- regs->ARM_ip, regs->ARM_sp, regs->ARM_lr, regs->ARM_pc,
- regs->ARM_cpsr);
-}
-
-struct mode_regs {
- unsigned long sp_svc;
- unsigned long lr_svc;
- unsigned long spsr_svc;
-
- unsigned long sp_abt;
- unsigned long lr_abt;
- unsigned long spsr_abt;
-
- unsigned long sp_und;
- unsigned long lr_und;
- unsigned long spsr_und;
-
- unsigned long sp_irq;
- unsigned long lr_irq;
- unsigned long spsr_irq;
-
- unsigned long r8_fiq;
- unsigned long r9_fiq;
- unsigned long r10_fiq;
- unsigned long r11_fiq;
- unsigned long r12_fiq;
- unsigned long sp_fiq;
- unsigned long lr_fiq;
- unsigned long spsr_fiq;
-};
-
-static void __naked get_mode_regs(struct mode_regs *regs)
-{
- asm volatile (
- "mrs r1, cpsr\n"
- "msr cpsr_c, #0xd3 @(SVC_MODE | PSR_I_BIT | PSR_F_BIT)\n"
- "stmia r0!, {r13 - r14}\n"
- "mrs r2, spsr\n"
- "msr cpsr_c, #0xd7 @(ABT_MODE | PSR_I_BIT | PSR_F_BIT)\n"
- "stmia r0!, {r2, r13 - r14}\n"
- "mrs r2, spsr\n"
- "msr cpsr_c, #0xdb @(UND_MODE | PSR_I_BIT | PSR_F_BIT)\n"
- "stmia r0!, {r2, r13 - r14}\n"
- "mrs r2, spsr\n"
- "msr cpsr_c, #0xd2 @(IRQ_MODE | PSR_I_BIT | PSR_F_BIT)\n"
- "stmia r0!, {r2, r13 - r14}\n"
- "mrs r2, spsr\n"
- "msr cpsr_c, #0xd1 @(FIQ_MODE | PSR_I_BIT | PSR_F_BIT)\n"
- "stmia r0!, {r2, r8 - r14}\n"
- "mrs r2, spsr\n"
- "stmia r0!, {r2}\n"
- "msr cpsr_c, r1\n"
- "bx lr\n");
-}
-
-
-void fiq_debugger_dump_allregs(struct fiq_debugger_output *output,
- const struct pt_regs *regs)
-{
- struct mode_regs mode_regs;
- unsigned long mode = regs->ARM_cpsr & MODE_MASK;
-
- fiq_debugger_dump_regs(output, regs);
- get_mode_regs(&mode_regs);
-
- output->printf(output,
- "%csvc: sp %08x lr %08x spsr %08x\n",
- mode == SVC_MODE ? '*' : ' ',
- mode_regs.sp_svc, mode_regs.lr_svc, mode_regs.spsr_svc);
- output->printf(output,
- "%cabt: sp %08x lr %08x spsr %08x\n",
- mode == ABT_MODE ? '*' : ' ',
- mode_regs.sp_abt, mode_regs.lr_abt, mode_regs.spsr_abt);
- output->printf(output,
- "%cund: sp %08x lr %08x spsr %08x\n",
- mode == UND_MODE ? '*' : ' ',
- mode_regs.sp_und, mode_regs.lr_und, mode_regs.spsr_und);
- output->printf(output,
- "%cirq: sp %08x lr %08x spsr %08x\n",
- mode == IRQ_MODE ? '*' : ' ',
- mode_regs.sp_irq, mode_regs.lr_irq, mode_regs.spsr_irq);
- output->printf(output,
- "%cfiq: r8 %08x r9 %08x r10 %08x r11 %08x r12 %08x\n",
- mode == FIQ_MODE ? '*' : ' ',
- mode_regs.r8_fiq, mode_regs.r9_fiq, mode_regs.r10_fiq,
- mode_regs.r11_fiq, mode_regs.r12_fiq);
- output->printf(output,
- " fiq: sp %08x lr %08x spsr %08x\n",
- mode_regs.sp_fiq, mode_regs.lr_fiq, mode_regs.spsr_fiq);
-}
-
-struct stacktrace_state {
- struct fiq_debugger_output *output;
- unsigned int depth;
-};
-
-static int report_trace(struct stackframe *frame, void *d)
-{
- struct stacktrace_state *sts = d;
-
- if (sts->depth) {
- sts->output->printf(sts->output,
- " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n",
- frame->pc, frame->pc, frame->lr, frame->lr,
- frame->sp, frame->fp);
- sts->depth--;
- return 0;
- }
- sts->output->printf(sts->output, " ...\n");
-
- return sts->depth == 0;
-}
-
-struct frame_tail {
- struct frame_tail *fp;
- unsigned long sp;
- unsigned long lr;
-} __attribute__((packed));
-
-static struct frame_tail *user_backtrace(struct fiq_debugger_output *output,
- struct frame_tail *tail)
-{
- struct frame_tail buftail[2];
-
- /* Also check accessibility of one struct frame_tail beyond */
- if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) {
- output->printf(output, " invalid frame pointer %p\n",
- tail);
- return NULL;
- }
- if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) {
- output->printf(output,
- " failed to copy frame pointer %p\n", tail);
- return NULL;
- }
-
- output->printf(output, " %p\n", buftail[0].lr);
-
- /* frame pointers should strictly progress back up the stack
- * (towards higher addresses) */
- if (tail >= buftail[0].fp)
- return NULL;
-
- return buftail[0].fp-1;
-}
-
-void fiq_debugger_dump_stacktrace(struct fiq_debugger_output *output,
- const struct pt_regs *regs, unsigned int depth, void *ssp)
-{
- struct frame_tail *tail;
- struct thread_info *real_thread_info = THREAD_INFO(ssp);
- struct stacktrace_state sts;
-
- sts.depth = depth;
- sts.output = output;
- *current_thread_info() = *real_thread_info;
-
- if (!current)
- output->printf(output, "current NULL\n");
- else
- output->printf(output, "pid: %d comm: %s\n",
- current->pid, current->comm);
- fiq_debugger_dump_regs(output, regs);
-
- if (!user_mode(regs)) {
- struct stackframe frame;
- frame.fp = regs->ARM_fp;
- frame.sp = regs->ARM_sp;
- frame.lr = regs->ARM_lr;
- frame.pc = regs->ARM_pc;
- output->printf(output,
- " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n",
- regs->ARM_pc, regs->ARM_pc, regs->ARM_lr, regs->ARM_lr,
- regs->ARM_sp, regs->ARM_fp);
- walk_stackframe(&frame, report_trace, &sts);
- return;
- }
-
- tail = ((struct frame_tail *) regs->ARM_fp) - 1;
- while (depth-- && tail && !((unsigned long) tail & 3))
- tail = user_backtrace(output, tail);
-}
+++ /dev/null
-/*
- * Copyright (C) 2014 Google, Inc.
- * Author: Colin Cross <ccross@android.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#include <linux/ptrace.h>
-#include <asm/stacktrace.h>
-
-#include "fiq_debugger_priv.h"
-
-static char *mode_name(const struct pt_regs *regs)
-{
- if (compat_user_mode(regs)) {
- return "USR";
- } else {
- switch (processor_mode(regs)) {
- case PSR_MODE_EL0t: return "EL0t";
- case PSR_MODE_EL1t: return "EL1t";
- case PSR_MODE_EL1h: return "EL1h";
- case PSR_MODE_EL2t: return "EL2t";
- case PSR_MODE_EL2h: return "EL2h";
- default: return "???";
- }
- }
-}
-
-void fiq_debugger_dump_pc(struct fiq_debugger_output *output,
- const struct pt_regs *regs)
-{
- output->printf(output, " pc %016lx cpsr %08lx mode %s\n",
- regs->pc, regs->pstate, mode_name(regs));
-}
-
-void fiq_debugger_dump_regs_aarch32(struct fiq_debugger_output *output,
- const struct pt_regs *regs)
-{
- output->printf(output, " r0 %08x r1 %08x r2 %08x r3 %08x\n",
- regs->compat_usr(0), regs->compat_usr(1),
- regs->compat_usr(2), regs->compat_usr(3));
- output->printf(output, " r4 %08x r5 %08x r6 %08x r7 %08x\n",
- regs->compat_usr(4), regs->compat_usr(5),
- regs->compat_usr(6), regs->compat_usr(7));
- output->printf(output, " r8 %08x r9 %08x r10 %08x r11 %08x\n",
- regs->compat_usr(8), regs->compat_usr(9),
- regs->compat_usr(10), regs->compat_usr(11));
- output->printf(output, " ip %08x sp %08x lr %08x pc %08x\n",
- regs->compat_usr(12), regs->compat_sp,
- regs->compat_lr, regs->pc);
- output->printf(output, " cpsr %08x (%s)\n",
- regs->pstate, mode_name(regs));
-}
-
-void fiq_debugger_dump_regs_aarch64(struct fiq_debugger_output *output,
- const struct pt_regs *regs)
-{
-
- output->printf(output, " x0 %016lx x1 %016lx\n",
- regs->regs[0], regs->regs[1]);
- output->printf(output, " x2 %016lx x3 %016lx\n",
- regs->regs[2], regs->regs[3]);
- output->printf(output, " x4 %016lx x5 %016lx\n",
- regs->regs[4], regs->regs[5]);
- output->printf(output, " x6 %016lx x7 %016lx\n",
- regs->regs[6], regs->regs[7]);
- output->printf(output, " x8 %016lx x9 %016lx\n",
- regs->regs[8], regs->regs[9]);
- output->printf(output, " x10 %016lx x11 %016lx\n",
- regs->regs[10], regs->regs[11]);
- output->printf(output, " x12 %016lx x13 %016lx\n",
- regs->regs[12], regs->regs[13]);
- output->printf(output, " x14 %016lx x15 %016lx\n",
- regs->regs[14], regs->regs[15]);
- output->printf(output, " x16 %016lx x17 %016lx\n",
- regs->regs[16], regs->regs[17]);
- output->printf(output, " x18 %016lx x19 %016lx\n",
- regs->regs[18], regs->regs[19]);
- output->printf(output, " x20 %016lx x21 %016lx\n",
- regs->regs[20], regs->regs[21]);
- output->printf(output, " x22 %016lx x23 %016lx\n",
- regs->regs[22], regs->regs[23]);
- output->printf(output, " x24 %016lx x25 %016lx\n",
- regs->regs[24], regs->regs[25]);
- output->printf(output, " x26 %016lx x27 %016lx\n",
- regs->regs[26], regs->regs[27]);
- output->printf(output, " x28 %016lx x29 %016lx\n",
- regs->regs[28], regs->regs[29]);
- output->printf(output, " x30 %016lx sp %016lx\n",
- regs->regs[30], regs->sp);
- output->printf(output, " pc %016lx cpsr %08x (%s)\n",
- regs->pc, regs->pstate, mode_name(regs));
-}
-
-void fiq_debugger_dump_regs(struct fiq_debugger_output *output,
- const struct pt_regs *regs)
-{
- if (compat_user_mode(regs))
- fiq_debugger_dump_regs_aarch32(output, regs);
- else
- fiq_debugger_dump_regs_aarch64(output, regs);
-}
-
-#define READ_SPECIAL_REG(x) ({ \
- u64 val; \
- asm volatile ("mrs %0, " # x : "=r"(val)); \
- val; \
-})
-
-void fiq_debugger_dump_allregs(struct fiq_debugger_output *output,
- const struct pt_regs *regs)
-{
- u32 pstate = READ_SPECIAL_REG(CurrentEl);
- bool in_el2 = (pstate & PSR_MODE_MASK) >= PSR_MODE_EL2t;
-
- fiq_debugger_dump_regs(output, regs);
-
- output->printf(output, " sp_el0 %016lx\n",
- READ_SPECIAL_REG(sp_el0));
-
- if (in_el2)
- output->printf(output, " sp_el1 %016lx\n",
- READ_SPECIAL_REG(sp_el1));
-
- output->printf(output, " elr_el1 %016lx\n",
- READ_SPECIAL_REG(elr_el1));
-
- output->printf(output, " spsr_el1 %08lx\n",
- READ_SPECIAL_REG(spsr_el1));
-
- if (in_el2) {
- output->printf(output, " spsr_irq %08lx\n",
- READ_SPECIAL_REG(spsr_irq));
- output->printf(output, " spsr_abt %08lx\n",
- READ_SPECIAL_REG(spsr_abt));
- output->printf(output, " spsr_und %08lx\n",
- READ_SPECIAL_REG(spsr_und));
- output->printf(output, " spsr_fiq %08lx\n",
- READ_SPECIAL_REG(spsr_fiq));
- output->printf(output, " spsr_el2 %08lx\n",
- READ_SPECIAL_REG(elr_el2));
- output->printf(output, " spsr_el2 %08lx\n",
- READ_SPECIAL_REG(spsr_el2));
- }
-}
-
-struct stacktrace_state {
- struct fiq_debugger_output *output;
- unsigned int depth;
-};
-
-static int report_trace(struct stackframe *frame, void *d)
-{
- struct stacktrace_state *sts = d;
-
- if (sts->depth) {
- sts->output->printf(sts->output, "%pF:\n", frame->pc);
- sts->output->printf(sts->output,
- " pc %016lx fp %016lx\n",
- frame->pc, frame->fp);
- sts->depth--;
- return 0;
- }
- sts->output->printf(sts->output, " ...\n");
-
- return sts->depth == 0;
-}
-
-void fiq_debugger_dump_stacktrace(struct fiq_debugger_output *output,
- const struct pt_regs *regs, unsigned int depth, void *ssp)
-{
- struct thread_info *real_thread_info = THREAD_INFO(ssp);
- struct stacktrace_state sts;
-
- sts.depth = depth;
- sts.output = output;
- *current_thread_info() = *real_thread_info;
-
- if (!current)
- output->printf(output, "current NULL\n");
- else
- output->printf(output, "pid: %d comm: %s\n",
- current->pid, current->comm);
- fiq_debugger_dump_regs(output, regs);
-
- if (!user_mode(regs)) {
- struct stackframe frame;
- frame.fp = regs->regs[29];
- frame.pc = regs->pc;
- output->printf(output, "\n");
- walk_stackframe(current, &frame, report_trace, &sts);
- }
-}
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff