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Subject[PATCH 1/2] microblaze: add stack unwinder
Date
Implement intelligent backtracing by searching for stack frame creation,
and emitting only return addresses. Use print_hex_dump() to display the
entire binary kernel stack.

Limitation: MMU kernels are not currently able to trace beyond a system trap
(interrupt, syscall, etc.). It is the intent of this patch to provide
infrastructure that can be extended to add this capability later.

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
---
diff -uprN a/arch/microblaze/include/asm/exceptions.h b/arch/microblaze/include/asm/exceptions.h
--- a/arch/microblaze/include/asm/exceptions.h 2010-04-09 21:52:36.000000000 -0500
+++ b/arch/microblaze/include/asm/exceptions.h 2010-04-12 22:21:01.000000000 -0500
@@ -14,6 +14,11 @@
#define _ASM_MICROBLAZE_EXCEPTIONS_H

#ifdef __KERNEL__
+
+#ifndef CONFIG_MMU
+#define EX_HANDLER_STACK_SIZ (4*19)
+#endif
+
#ifndef __ASSEMBLY__

/* Macros to enable and disable HW exceptions in the MSR */
diff -uprN a/arch/microblaze/include/asm/system.h b/arch/microblaze/include/asm/system.h
--- a/arch/microblaze/include/asm/system.h 2010-04-09 21:52:36.000000000 -0500
+++ b/arch/microblaze/include/asm/system.h 2010-04-12 22:16:01.000000000 -0500
@@ -44,7 +44,6 @@ extern struct task_struct *_switch_to(st
#define smp_rmb() rmb()
#define smp_wmb() wmb()

-void show_trace(struct task_struct *task, unsigned long *stack);
void __bad_xchg(volatile void *ptr, int size);

static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
diff -uprN a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S
--- a/arch/microblaze/kernel/entry-nommu.S 2010-04-09 21:52:36.000000000 -0500
+++ b/arch/microblaze/kernel/entry-nommu.S 2010-04-12 22:16:01.000000000 -0500
@@ -586,3 +586,31 @@ sys_rt_sigsuspend_wrapper:
#include "syscall_table.S"

syscall_table_size=(.-sys_call_table)
+
+type_SYSCALL:
+ .ascii "SYSCALL\0"
+type_IRQ:
+ .ascii "IRQ\0"
+type_IRQ_PREEMPT:
+ .ascii "IRQ (PREEMPTED)\0"
+type_SYSCALL_PREEMPT:
+ .ascii " SYSCALL (PREEMPTED)\0"
+
+ /*
+ * Trap decoding for stack unwinder
+ * Tuples are (start addr, end addr, string)
+ * If return address lies on [start addr, end addr],
+ * unwinder displays 'string'
+ */
+
+ .align 4
+.global microblaze_trap_handlers
+microblaze_trap_handlers:
+ /* Exact matches come first */
+ .word ret_to_user ; .word ret_to_user ; .word type_SYSCALL
+ .word ret_from_intr; .word ret_from_intr ; .word type_IRQ
+ /* Fuzzy matches go here */
+ .word ret_from_intr; .word no_intr_resched; .word type_IRQ_PREEMPT
+ .word work_pending ; .word no_work_pending; .word type_SYSCALL_PREEMPT
+ /* End of table */
+ .word 0 ; .word 0 ; .word 0
diff -uprN a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
--- a/arch/microblaze/kernel/entry.S 2010-04-09 21:52:36.000000000 -0500
+++ b/arch/microblaze/kernel/entry.S 2010-04-12 22:16:01.000000000 -0500
@@ -1127,3 +1127,30 @@ ENTRY(_break)

syscall_table_size=(.-sys_call_table)

+type_SYSCALL:
+ .ascii "SYSCALL\0"
+type_IRQ:
+ .ascii "IRQ\0"
+type_IRQ_PREEMPT:
+ .ascii "IRQ (PREEMPTED)\0"
+type_SYSCALL_PREEMPT:
+ .ascii " SYSCALL (PREEMPTED)\0"
+
+ /*
+ * Trap decoding for stack unwinder
+ * Tuples are (start addr, end addr, string)
+ * If return address lies on [start addr, end addr],
+ * unwinder displays 'string'
+ */
+
+ .align 4
+.global microblaze_trap_handlers
+microblaze_trap_handlers:
+ /* Exact matches come first */
+ .word ret_from_trap; .word ret_from_trap ; .word type_SYSCALL
+ .word ret_from_irq ; .word ret_from_irq ; .word type_IRQ
+ /* Fuzzy matches go here */
+ .word ret_from_irq ; .word no_intr_resched ; .word type_IRQ_PREEMPT
+ .word ret_from_trap; .word TRAP_return ; .word type_SYSCALL_PREEMPT
+ /* End of table */
+ .word 0 ; .word 0 ; .word 0
diff -uprN a/arch/microblaze/kernel/hw_exception_handler.S b/arch/microblaze/kernel/hw_exception_handler.S
--- a/arch/microblaze/kernel/hw_exception_handler.S 2010-04-09 21:52:36.000000000 -0500
+++ b/arch/microblaze/kernel/hw_exception_handler.S 2010-04-12 22:21:15.000000000 -0500
@@ -78,9 +78,6 @@
#include <asm/asm-offsets.h>

/* Helpful Macros */
-#ifndef CONFIG_MMU
-#define EX_HANDLER_STACK_SIZ (4*19)
-#endif
#define NUM_TO_REG(num) r ## num

#ifdef CONFIG_MMU
@@ -988,6 +985,7 @@ ex_unaligned_fixup:
.end _unaligned_data_exception
#endif /* CONFIG_MMU */

+.global ex_handler_unhandled
ex_handler_unhandled:
/* FIXME add handle function for unhandled exception - dump register */
bri 0
diff -uprN a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile
--- a/arch/microblaze/kernel/Makefile 2010-04-09 21:52:36.000000000 -0500
+++ b/arch/microblaze/kernel/Makefile 2010-04-12 22:16:01.000000000 -0500
@@ -17,7 +17,8 @@ extra-y := head.o vmlinux.lds
obj-y += dma.o exceptions.o \
hw_exception_handler.o init_task.o intc.o irq.o of_device.o \
of_platform.o process.o prom.o prom_parse.o ptrace.o \
- setup.o signal.o sys_microblaze.o timer.o traps.o reset.o
+ setup.o signal.o sys_microblaze.o timer.o traps.o reset.o \
+ unwind.o

obj-y += cpu/

diff -uprN a/arch/microblaze/kernel/stacktrace.c b/arch/microblaze/kernel/stacktrace.c
--- a/arch/microblaze/kernel/stacktrace.c 2010-04-09 21:52:36.000000000 -0500
+++ b/arch/microblaze/kernel/stacktrace.c 2010-04-12 22:16:01.000000000 -0500
@@ -14,52 +14,18 @@
#include <linux/thread_info.h>
#include <linux/ptrace.h>
#include <linux/module.h>
+#include "unwind.h"

-/* FIXME initial support */
void save_stack_trace(struct stack_trace *trace)
{
- unsigned long *sp;
- unsigned long addr;
- asm("addik %0, r1, 0" : "=r" (sp));
-
- while (!kstack_end(sp)) {
- addr = *sp++;
- if (__kernel_text_address(addr)) {
- if (trace->skip > 0)
- trace->skip--;
- else
- trace->entries[trace->nr_entries++] = addr;
-
- if (trace->nr_entries >= trace->max_entries)
- break;
- }
- }
+ /* Exclude our helper functions from the trace*/
+ trace->skip += 2;
+ microblaze_unwind(NULL, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace);

void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
- unsigned int *sp;
- unsigned long addr;
-
- struct thread_info *ti = task_thread_info(tsk);
-
- if (tsk == current)
- asm("addik %0, r1, 0" : "=r" (sp));
- else
- sp = (unsigned int *)ti->cpu_context.r1;
-
- while (!kstack_end(sp)) {
- addr = *sp++;
- if (__kernel_text_address(addr)) {
- if (trace->skip > 0)
- trace->skip--;
- else
- trace->entries[trace->nr_entries++] = addr;
-
- if (trace->nr_entries >= trace->max_entries)
- break;
- }
- }
+ microblaze_unwind(tsk, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
diff -uprN a/arch/microblaze/kernel/traps.c b/arch/microblaze/kernel/traps.c
--- a/arch/microblaze/kernel/traps.c 2010-04-09 21:52:36.000000000 -0500
+++ b/arch/microblaze/kernel/traps.c 2010-04-12 22:16:01.000000000 -0500
@@ -13,16 +13,19 @@
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/debug_locks.h>
+#include <linux/seq_file.h>

#include <asm/exceptions.h>
#include <asm/system.h>

+#include "unwind.h"
+
void trap_init(void)
{
__enable_hw_exceptions();
}

-static unsigned long kstack_depth_to_print = 24;
+static unsigned long kstack_depth_to_print; /* 0 == entire stack */

static int __init kstack_setup(char *s)
{
@@ -30,31 +33,42 @@ static int __init kstack_setup(char *s)
}
__setup("kstack=", kstack_setup);

-void show_trace(struct task_struct *task, unsigned long *stack)
+void show_stack(struct task_struct *task, unsigned long *sp)
{
- unsigned long addr;
+ unsigned long words_to_show;
+ __u32 fp = (__u32) sp;

- if (!stack)
- stack = (unsigned long *)&stack;
+ if (fp == 0) {
+ if (task)
+ fp = ((struct thread_info *)
+ (task->stack))->cpu_context.r1;
+ else {
+ /* Pick up caller of dump_stack() */
+ fp = (__u32)&sp - 8;
+ }
+ }

- printk(KERN_NOTICE "Call Trace: ");
-#ifdef CONFIG_KALLSYMS
- printk(KERN_NOTICE "\n");
-#endif
- while (!kstack_end(stack)) {
- addr = *stack++;
- /*
- * If the address is either in the text segment of the
- * kernel, or in the region which contains vmalloc'ed
- * memory, it *may* be the address of a calling
- * routine; if so, print it so that someone tracing
- * down the cause of the crash will be able to figure
- * out the call path that was taken.
- */
- if (kernel_text_address(addr))
- print_ip_sym(addr);
+ words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE-1))) >> 2;
+ if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
+ words_to_show = kstack_depth_to_print;
+
+ pr_info("Stack:\n");
+ if (fp & 0xF) {
+ unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
+ if (line1_words < words_to_show) {
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
+ 4, (void *)fp, line1_words << 2, 0);
+ fp += line1_words << 2;
+ words_to_show -= line1_words;
+ }
}
- printk(KERN_NOTICE "\n");
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
+ words_to_show << 2, 0);
+ printk(KERN_INFO "\n\n");
+
+ pr_info("Call Trace:\n");
+ microblaze_unwind(task, NULL);
+ pr_info("\n");

if (!task)
task = current;
@@ -62,34 +76,6 @@ void show_trace(struct task_struct *task
debug_show_held_locks(task);
}

-void show_stack(struct task_struct *task, unsigned long *sp)
-{
- unsigned long *stack;
- int i;
-
- if (sp == NULL) {
- if (task)
- sp = (unsigned long *) ((struct thread_info *)
- (task->stack))->cpu_context.r1;
- else
- sp = (unsigned long *)&sp;
- }
-
- stack = sp;
-
- printk(KERN_INFO "\nStack:\n ");
-
- for (i = 0; i < kstack_depth_to_print; i++) {
- if (kstack_end(sp))
- break;
- if (i && ((i % 8) == 0))
- printk("\n ");
- printk("%08lx ", *sp++);
- }
- printk("\n");
- show_trace(task, stack);
-}
-
void dump_stack(void)
{
show_stack(NULL, NULL);
@@ -129,3 +115,4 @@ int debug_trap(struct pt_regs *regs)
return -ENOSYS;
}
#endif
+
diff -uprN a/arch/microblaze/kernel/unwind.c b/arch/microblaze/kernel/unwind.c
--- a/arch/microblaze/kernel/unwind.c 1969-12-31 18:00:00.000000000 -0600
+++ b/arch/microblaze/kernel/unwind.c 2010-04-12 22:16:01.000000000 -0500
@@ -0,0 +1,316 @@
+/*
+ * Backtrace support for Microblaze
+ *
+ * Copyright (C) 2010 Digital Design Corporation
+ *
+ * Based on arch/sh/kernel/cpu/sh5/unwind.c code which is:
+ * Copyright (C) 2004 Paul Mundt
+ * Copyright (C) 2004 Richard Curnow
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+/* #define DEBUG 1 */
+#include <linux/kallsyms.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <asm/sections.h>
+#include <asm/exceptions.h>
+#include "unwind.h"
+
+struct stack_trace;
+
+/*
+ * On Microblaze, finding the previous stack frame is a little tricky.
+ * At this writing (3/2010), Microblaze does not support CONFIG_FRAME_POINTERS,
+ * and even if it did, gcc (4.1.2) does not store the frame pointer at
+ * a consistent offset within each frame. To determine frame size, it is
+ * necessary to search for the assembly instruction that creates the frame
+ * and extract the size from it.
+ *
+ * Microblaze stores the stack pointer in r1, and creates a frame via
+ *
+ * addik r1, r1, -FRAME_SIZE
+ *
+ * A stack frame is usually not created in a leaf function.
+ *
+ */
+
+/**
+ * get_frame_size - Extract the stack adjustment from an
+ * "addik r1, r1, -adjust" instruction
+ * @instr : Microblaze instruction
+ *
+ * Return - Number of bytes the instruction reserves for a stack frame
+ */
+inline s16 get_frame_size(unsigned long instr)
+{
+ return -(s16)(instr & 0xFFFF);
+}
+
+/**
+ * find_frame_creation - Search backward to find the instruction that creates
+ * the stack frame (hopefully, for the same function the
+ * initial PC is in).
+ * @pc : Program counter at which to begin the search
+ *
+ * Return - PC at which stack frame creation occurs
+ * NULL if this cannot be found, i.e. a leaf function
+ */
+static unsigned long *find_frame_creation(unsigned long *pc)
+{
+ int i;
+
+ /* NOTE: Distance to search is arbitrary
+ * 250 works well for most things,
+ * 750 picks up things like tcp_recvmsg(),
+ * 1000 needed for fat_fill_super()
+ */
+ for (i = 0; i < 1000; i++, pc--) {
+ unsigned long instr;
+ s16 frame_size;
+
+ if (!kernel_text_address((unsigned long) pc))
+ return NULL;
+
+ instr = *pc;
+
+ /*
+ * rtsd of some sort,
+ * i.e., a return from a previous function?
+ */
+ if ((instr & 0xFFE00000) == 0xb6000000)
+ return NULL;
+
+ if ((instr & 0xFFFF0000) != 0x30210000) /* addik r1, r1 */
+ continue;
+
+ frame_size = get_frame_size(instr);
+ if ((frame_size < 8) || (frame_size & 3)) {
+ pr_debug(" Invalid frame size %d at 0x%p\n",
+ frame_size, pc);
+ return NULL;
+ }
+
+ pr_debug(" Found frame creation at 0x%p, size %d\n", pc,
+ frame_size);
+ return pc;
+ }
+
+ return NULL;
+}
+
+/**
+ * lookup_prev_stack_frame - Find the stack frame of the previous function.
+ * @fp : Frame (stack) pointer for current function
+ * @pc : Program counter within current function
+ * @leaf_return : r15 value within current function. If the current function
+ * is a leaf, this is the caller's return address.
+ * @pprev_fp : On exit, set to frame (stack) pointer for previous function
+ * @pprev_pc : On exit, set to current function caller's return address
+ *
+ * Return - 0 on success, -EINVAL if the previous frame cannot be found
+ */
+static int lookup_prev_stack_frame(unsigned long fp, unsigned long pc,
+ unsigned long leaf_return,
+ unsigned long *pprev_fp,
+ unsigned long *pprev_pc)
+{
+ unsigned long *prologue = NULL;
+
+ /* _switch_to is a special leaf function */
+ if (pc != (unsigned long) &_switch_to)
+ prologue = find_frame_creation((unsigned long *)pc);
+
+ if (prologue) {
+ s16 frame_size = get_frame_size(*prologue);
+
+ *pprev_fp = fp + frame_size;
+ *pprev_pc = *(unsigned long *)fp;
+ } else {
+ if (!leaf_return)
+ return -EINVAL;
+ *pprev_pc = leaf_return;
+ *pprev_fp = fp;
+ }
+
+ /* NOTE: don't check kernel_text_address here, to allow display
+ * of userland return address
+ */
+ return (!*pprev_pc || (*pprev_pc & 3)) ? -EINVAL : 0;
+}
+
+static void microblaze_unwind_inner(struct task_struct *task,
+ unsigned long pc, unsigned long fp,
+ unsigned long leaf_return,
+ struct stack_trace *trace);
+
+/**
+ * unwind_trap - Unwind through a system trap, that stored previous state
+ * on the stack.
+ */
+#ifdef CONFIG_MMU
+static inline void unwind_trap(struct task_struct *task, unsigned long pc,
+ unsigned long fp, struct stack_trace *trace)
+{
+ /* To be implemented */
+}
+#else
+static inline void unwind_trap(struct task_struct *task, unsigned long pc,
+ unsigned long fp, struct stack_trace *trace)
+{
+ const struct pt_regs *regs = (const struct pt_regs *) fp;
+ microblaze_unwind_inner(task, regs->pc, regs->r1, regs->r15, trace);
+}
+#endif
+
+/**
+ * microblaze_unwind_inner - Unwind the stack from the specified point
+ * @task : Task whose stack we are to unwind (may be NULL)
+ * @pc : Program counter from which we start unwinding
+ * @fp : Frame (stack) pointer from which we start unwinding
+ * @leaf_return : Value of r15 at pc. If the function is a leaf, this is
+ * the caller's return address.
+ * @trace : Where to store stack backtrace (PC values).
+ * NULL == print backtrace to kernel log
+ */
+void microblaze_unwind_inner(struct task_struct *task,
+ unsigned long pc, unsigned long fp,
+ unsigned long leaf_return,
+ struct stack_trace *trace)
+{
+ int ofs = 0;
+
+ pr_debug(" Unwinding with PC=%p, FP=%p\n", (void *)pc, (void *)fp);
+ if (!pc || !fp || (pc & 3) || (fp & 3)) {
+ pr_debug(" Invalid state for unwind, aborting\n");
+ return;
+ }
+ for (; pc != 0;) {
+ unsigned long next_fp, next_pc = 0;
+ unsigned long return_to = pc + 2 * sizeof(unsigned long);
+ const struct trap_handler_info *handler =
+ &microblaze_trap_handlers;
+
+ /* Is previous function the HW exception handler? */
+ if ((return_to >= (unsigned long)&_hw_exception_handler)
+ &&(return_to < (unsigned long)&ex_handler_unhandled)) {
+ /*
+ * HW exception handler doesn't save all registers,
+ * so we open-code a special case of unwind_trap()
+ */
+#ifndef CONFIG_MMU
+ const struct pt_regs *regs =
+ (const struct pt_regs *) fp;
+#endif
+ pr_info("HW EXCEPTION\n");
+#ifndef CONFIG_MMU
+ microblaze_unwind_inner(task, regs->r17 - 4,
+ fp + EX_HANDLER_STACK_SIZ,
+ regs->r15, trace);
+#endif
+ return;
+ }
+
+ /* Is previous function a trap handler? */
+ for (; handler->start_addr; ++handler) {
+ if ((return_to >= handler->start_addr)
+ && (return_to <= handler->end_addr)) {
+ if (!trace)
+ pr_info("%s\n", handler->trap_name);
+ unwind_trap(task, pc, fp, trace);
+ return;
+ }
+ }
+ pc -= ofs;
+
+ if (trace) {
+#ifdef CONFIG_STACKTRACE
+ if (trace->skip > 0)
+ trace->skip--;
+ else
+ trace->entries[trace->nr_entries++] = pc;
+
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+#endif
+ } else {
+ /* Have we reached userland? */
+ if (unlikely(pc == task_pt_regs(task)->pc)) {
+ pr_info("[<%p>] PID %lu [%s]\n",
+ (void *) pc,
+ (unsigned long) task->pid,
+ task->comm);
+ break;
+ } else
+ print_ip_sym(pc);
+ }
+
+ /* Stop when we reach anything not part of the kernel */
+ if (!kernel_text_address(pc))
+ break;
+
+ if (lookup_prev_stack_frame(fp, pc, leaf_return, &next_fp,
+ &next_pc) == 0) {
+ ofs = sizeof(unsigned long);
+ pc = next_pc & ~3;
+ fp = next_fp;
+ leaf_return = 0;
+ } else {
+ pr_debug(" Failed to find previous stack frame\n");
+ break;
+ }
+
+ pr_debug(" Next PC=%p, next FP=%p\n",
+ (void *)next_pc, (void *)next_fp);
+ }
+}
+
+/**
+ * microblaze_unwind - Stack unwinder for Microblaze (external entry point)
+ * @task : Task whose stack we are to unwind (NULL == current)
+ * @trace : Where to store stack backtrace (PC values).
+ * NULL == print backtrace to kernel log
+ */
+void microblaze_unwind(struct task_struct *task, struct stack_trace *trace)
+{
+ if (task) {
+ if (task == current) {
+ const struct pt_regs *regs = task_pt_regs(task);
+ microblaze_unwind_inner(task, regs->pc, regs->r1,
+ regs->r15, trace);
+ } else {
+ struct thread_info *thread_info =
+ (struct thread_info *)(task->stack);
+ const struct cpu_context *cpu_context =
+ &thread_info->cpu_context;
+
+ microblaze_unwind_inner(task,
+ (unsigned long) &_switch_to,
+ cpu_context->r1,
+ cpu_context->r15, trace);
+ }
+ } else {
+ unsigned long pc, fp;
+
+ __asm__ __volatile__ ("or %0, r1, r0" : "=r" (fp));
+
+ __asm__ __volatile__ (
+ "brlid %0, 0f;"
+ "nop;"
+ "0:"
+ : "=r" (pc)
+ );
+
+ /* Since we are not a leaf function, use leaf_return = 0 */
+ microblaze_unwind_inner(current, pc, fp, 0, trace);
+ }
+}
+
diff -uprN a/arch/microblaze/kernel/unwind.h b/arch/microblaze/kernel/unwind.h
--- a/arch/microblaze/kernel/unwind.h 1969-12-31 18:00:00.000000000 -0600
+++ b/arch/microblaze/kernel/unwind.h 2010-04-12 22:16:01.000000000 -0500
@@ -0,0 +1,29 @@
+/*
+ * Backtrace support for Microblaze
+ *
+ * Copyright (C) 2010 Digital Design Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef __MICROBLAZE_UNWIND_H
+#define __MICROBLAZE_UNWIND_H
+
+struct stack_trace;
+
+struct trap_handler_info {
+ unsigned long start_addr;
+ unsigned long end_addr;
+ const char *trap_name;
+};
+extern struct trap_handler_info microblaze_trap_handlers;
+
+extern const char _hw_exception_handler;
+extern const char ex_handler_unhandled;
+
+void microblaze_unwind(struct task_struct *task, struct stack_trace *trace);
+
+#endif /* __MICROBLAZE_UNWIND_H */
+



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