#ifdef CONFIG_FIQ_GLUE
#include <asm/fiq_glue.h>
#endif
-#include <asm/stacktrace.h>
+
+#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_FIQ_DEBUGGER_PORTS 4
-#define THREAD_INFO(sp) ((struct thread_info *) \
- ((unsigned long)(sp) & ~(THREAD_SIZE - 1)))
-
struct fiq_debugger_state {
#ifdef CONFIG_FIQ_GLUE
struct fiq_glue_handler handler;
#endif
+ struct fiq_debugger_output output;
int fiq;
int uart_irq;
#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
}
}
-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 "???";
- }
-}
-
-static int fiq_debugger_printf(void *cookie, const char *fmt, ...)
+static void fiq_debugger_printf(struct fiq_debugger_output *output,
+ const char *fmt, ...)
{
- struct fiq_debugger_state *state = cookie;
+ 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);
- return state->debug_abort;
}
/* Safe outside fiq context */
return state->debug_abort;
}
-static void fiq_debugger_dump_regs(struct fiq_debugger_state *state,
- const struct pt_regs *regs)
-{
- fiq_debugger_printf(state,
- " r0 %08x r1 %08x r2 %08x r3 %08x\n",
- regs->ARM_r0, regs->ARM_r1, regs->ARM_r2, regs->ARM_r3);
- fiq_debugger_printf(state,
- " r4 %08x r5 %08x r6 %08x r7 %08x\n",
- regs->ARM_r4, regs->ARM_r5, regs->ARM_r6, regs->ARM_r7);
- fiq_debugger_printf(state,
- " 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));
- fiq_debugger_printf(state,
- " 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;
-};
-
-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");
-}
-
-
-static void fiq_debugger_dump_allregs(struct fiq_debugger_state *state,
- const struct pt_regs *regs)
-{
- struct mode_regs mode_regs;
- unsigned long mode = regs->ARM_cpsr & MODE_MASK;
-
- fiq_debugger_dump_regs(state, regs);
- get_mode_regs(&mode_regs);
-
- fiq_debugger_printf(state,
- "%csvc: sp %08x lr %08x spsr %08x\n",
- mode == SVC_MODE ? '*' : ' ',
- mode_regs.sp_svc, mode_regs.lr_svc, mode_regs.spsr_svc);
- fiq_debugger_printf(state,
- "%cabt: sp %08x lr %08x spsr %08x\n",
- mode == ABT_MODE ? '*' : ' ',
- mode_regs.sp_abt, mode_regs.lr_abt, mode_regs.spsr_abt);
- fiq_debugger_printf(state,
- "%cund: sp %08x lr %08x spsr %08x\n",
- mode == UND_MODE ? '*' : ' ',
- mode_regs.sp_und, mode_regs.lr_und, mode_regs.spsr_und);
- fiq_debugger_printf(state,
- "%cirq: sp %08x lr %08x spsr %08x\n",
- mode == IRQ_MODE ? '*' : ' ',
- mode_regs.sp_irq, mode_regs.lr_irq, mode_regs.spsr_irq);
- fiq_debugger_printf(state,
- "%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);
- fiq_debugger_printf(state,
- " fiq: sp %08x lr %08x spsr %08x\n",
- mode_regs.sp_fiq, mode_regs.lr_fiq, mode_regs.spsr_fiq);
-}
-
static void fiq_debugger_dump_irqs(struct fiq_debugger_state *state)
{
int n;
struct irq_desc *desc;
- fiq_debugger_printf(state,
+ 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, "%5d: %10u %11u %8x %s\n", n,
+ 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,
}
}
-struct stacktrace_state {
- struct fiq_debugger_state *state;
- unsigned int depth;
-};
-
-static int report_trace(struct stackframe *frame, void *d)
-{
- struct stacktrace_state *sts = d;
-
- if (sts->depth) {
- fiq_debugger_printf(sts->state,
- " 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;
- }
- fiq_debugger_printf(sts->state, " ...\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_state *state,
- 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))) {
- fiq_debugger_printf(state, " invalid frame pointer %p\n",
- tail);
- return NULL;
- }
- if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) {
- fiq_debugger_printf(state,
- " failed to copy frame pointer %p\n", tail);
- return NULL;
- }
-
- fiq_debugger_printf(state, " %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_state *state,
- 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.state = state;
- *current_thread_info() = *real_thread_info;
-
- if (!current)
- fiq_debugger_printf(state, "current NULL\n");
- else
- fiq_debugger_printf(state, "pid: %d comm: %s\n",
- current->pid, current->comm);
- fiq_debugger_dump_regs(state, 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;
- fiq_debugger_printf(state,
- " 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(state, tail);
-}
-
static void fiq_debugger_do_ps(struct fiq_debugger_state *state)
{
struct task_struct *g;
unsigned task_state;
static const char stat_nam[] = "RSDTtZX";
- fiq_debugger_printf(state, "pid ppid prio task pc\n");
+ 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,
+ fiq_debugger_printf(&state->output,
"%5d %5d %4d ", p->pid, p->parent->pid, p->prio);
- fiq_debugger_printf(state, "%-13.13s %c", p->comm,
+ 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, " running\n");
+ fiq_debugger_printf(&state->output, " running\n");
else
- fiq_debugger_printf(state, " %08lx\n",
+ fiq_debugger_printf(&state->output, " %08lx\n",
thread_saved_pc(p));
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
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, "sysrq-g blocked\n");
+ fiq_debugger_printf(&state->output, "sysrq-g blocked\n");
return;
}
fiq_debugger_begin_syslog_dump(state);
static void fiq_debugger_do_kgdb(struct fiq_debugger_state *state)
{
if (!fiq_kgdb_enable) {
- fiq_debugger_printf(state, "kgdb through fiq debugger not enabled\n");
+ fiq_debugger_printf(&state->output, "kgdb through fiq debugger not enabled\n");
return;
}
- fiq_debugger_printf(state, "enabling console and triggering kgdb\n");
+ fiq_debugger_printf(&state->output, "enabling console and triggering kgdb\n");
state->console_enable = true;
handle_sysrq('g');
}
spin_lock_irqsave(&state->work_lock, flags);
if (state->work_cmd[0] != '\0') {
- fiq_debugger_printf(state, "work command processor busy\n");
+ fiq_debugger_printf(&state->output, "work command processor busy\n");
spin_unlock_irqrestore(&state->work_lock, flags);
return;
}
else
kernel_restart(NULL);
} else {
- fiq_debugger_printf(state, "unknown work command '%s'\n",
+ fiq_debugger_printf(&state->output, "unknown work command '%s'\n",
work_cmd);
}
}
static void fiq_debugger_help(struct fiq_debugger_state *state)
{
- fiq_debugger_printf(state,
+ fiq_debugger_printf(&state->output,
"FIQ Debugger commands:\n"
" pc PC status\n"
" regs Register dump\n"
" irqs Interupt status\n"
" kmsg Kernel log\n"
" version Kernel version\n");
- fiq_debugger_printf(state,
+ 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,
+ 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,
+ fiq_debugger_printf(&state->output,
" kgdb Enter kernel debugger\n");
#endif
}
if (!strcmp(cmd, "help") || !strcmp(cmd, "?")) {
fiq_debugger_help(state);
} else if (!strcmp(cmd, "pc")) {
- fiq_debugger_printf(state, " pc %08x cpsr %08x mode %s\n",
- regs->ARM_pc, regs->ARM_cpsr,
- mode_name(regs->ARM_cpsr));
+ fiq_debugger_dump_pc(&state->output, regs);
} else if (!strcmp(cmd, "regs")) {
- fiq_debugger_dump_regs(state, regs);
+ fiq_debugger_dump_regs(&state->output, regs);
} else if (!strcmp(cmd, "allregs")) {
- fiq_debugger_dump_allregs(state, regs);
+ fiq_debugger_dump_allregs(&state->output, regs);
} else if (!strcmp(cmd, "bt")) {
- fiq_debugger_dump_stacktrace(state, regs, 100, svc_sp);
+ fiq_debugger_dump_stacktrace(&state->output, regs, 100, svc_sp);
} else if (!strncmp(cmd, "reset", 5)) {
cmd += 5;
while (*cmd == ' ')
} else if (!strcmp(cmd, "kmsg")) {
fiq_debugger_dump_kernel_log(state);
} else if (!strcmp(cmd, "version")) {
- fiq_debugger_printf(state, "%s\n", linux_banner);
+ fiq_debugger_printf(&state->output, "%s\n", linux_banner);
} else if (!strcmp(cmd, "sleep")) {
state->no_sleep = false;
- fiq_debugger_printf(state, "enabling sleep\n");
+ fiq_debugger_printf(&state->output, "enabling sleep\n");
} else if (!strcmp(cmd, "nosleep")) {
state->no_sleep = true;
- fiq_debugger_printf(state, "disabling sleep\n");
+ fiq_debugger_printf(&state->output, "disabling sleep\n");
} else if (!strcmp(cmd, "console")) {
- fiq_debugger_printf(state, "console mode\n");
+ 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, "cpu %d\n", state->current_cpu);
+ fiq_debugger_printf(&state->output, "cpu %d\n", state->current_cpu);
} else if (!strncmp(cmd, "cpu ", 4)) {
unsigned long cpu = 0;
- if (strict_strtoul(cmd + 4, 10, &cpu) == 0)
+ if (kstrtoul(cmd + 4, 10, &cpu) == 0)
fiq_debugger_switch_cpu(state, cpu);
else
- fiq_debugger_printf(state, "invalid cpu\n");
- fiq_debugger_printf(state, "cpu %d\n", state->current_cpu);
+ 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,
+ fiq_debugger_printf(&state->output,
"command processor busy. trying to abort.\n");
state->debug_abort = -1;
} else {
MAX_UNHANDLED_FIQ_COUNT)
return false;
- fiq_debugger_printf(state,
+ fiq_debugger_printf(&state->output,
"fiq_debugger: cpu %d not responding, "
"reverting to cpu %d\n", state->current_cpu,
this_cpu);
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;
if (state->wakeup_irq >= 0) {
ret = request_irq(state->wakeup_irq,
fiq_debugger_wakeup_irq_handler,
- IRQF_TRIGGER_FALLING | IRQF_DISABLED,
+ IRQF_TRIGGER_FALLING,
"debug-wakeup", state);
if (ret) {
pr_err("serial_debugger: "
},
};
+#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);
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff