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[MIPS] dump_stack() based on prologue code analysis
Instead of dump all possible address in the stack, unwind the stack frame based on prologue code analysis, as like as get_wchan() does. While the code analysis might fail for some reason, there is a new kernel option "raw_show_trace" to disable this feature. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto
Ralf Baechle
parent
79495d876c
commit
f66686f70a
@ -281,7 +281,7 @@ static struct mips_frame_info {
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} *schedule_frame, mfinfo[64];
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static int mfinfo_num;
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static int __init get_frame_info(struct mips_frame_info *info)
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static int get_frame_info(struct mips_frame_info *info)
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{
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int i;
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void *func = info->func;
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@ -329,14 +329,12 @@ static int __init get_frame_info(struct mips_frame_info *info)
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ip->i_format.simmediate / sizeof(long);
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}
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}
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if (info->pc_offset == -1 || info->frame_size == 0) {
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if (func == schedule)
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printk("Can't analyze prologue code at %p\n", func);
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info->pc_offset = -1;
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info->frame_size = 0;
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}
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return 0;
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if (info->frame_size && info->pc_offset >= 0) /* nested */
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return 0;
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if (info->pc_offset < 0) /* leaf */
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return 1;
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/* prologue seems boggus... */
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return -1;
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}
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static int __init frame_info_init(void)
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@ -367,8 +365,15 @@ static int __init frame_info_init(void)
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mfinfo[0].func = schedule;
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schedule_frame = &mfinfo[0];
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#endif
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for (i = 0; i < ARRAY_SIZE(mfinfo) && mfinfo[i].func; i++)
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get_frame_info(&mfinfo[i]);
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for (i = 0; i < ARRAY_SIZE(mfinfo) && mfinfo[i].func; i++) {
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struct mips_frame_info *info = &mfinfo[i];
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if (get_frame_info(info)) {
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/* leaf or unknown */
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if (info->func == schedule)
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printk("Can't analyze prologue code at %p\n",
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info->func);
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}
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}
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mfinfo_num = i;
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return 0;
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@ -427,6 +432,8 @@ unsigned long get_wchan(struct task_struct *p)
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if (i < 0)
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break;
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if (mfinfo[i].pc_offset < 0)
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break;
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pc = ((unsigned long *)frame)[mfinfo[i].pc_offset];
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if (!mfinfo[i].frame_size)
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break;
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@ -437,3 +444,40 @@ unsigned long get_wchan(struct task_struct *p)
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return pc;
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}
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#ifdef CONFIG_KALLSYMS
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/* used by show_frametrace() */
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unsigned long unwind_stack(struct task_struct *task,
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unsigned long **sp, unsigned long pc)
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{
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unsigned long stack_page;
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struct mips_frame_info info;
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char *modname;
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char namebuf[KSYM_NAME_LEN + 1];
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unsigned long size, ofs;
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stack_page = (unsigned long)task_stack_page(task);
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if (!stack_page)
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return 0;
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if (!kallsyms_lookup(pc, &size, &ofs, &modname, namebuf))
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return 0;
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if (ofs == 0)
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return 0;
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info.func = (void *)(pc - ofs);
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info.func_size = ofs; /* analyze from start to ofs */
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if (get_frame_info(&info)) {
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/* leaf or unknown */
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*sp += info.frame_size / sizeof(long);
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return 0;
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}
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if ((unsigned long)*sp < stack_page ||
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(unsigned long)*sp + info.frame_size / sizeof(long) >
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stack_page + THREAD_SIZE - 32)
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return 0;
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pc = (*sp)[info.pc_offset];
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*sp += info.frame_size / sizeof(long);
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return pc;
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}
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#endif
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@ -98,24 +98,53 @@ static void show_trace(unsigned long *stack)
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printk("\n");
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}
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#ifdef CONFIG_KALLSYMS
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static int raw_show_trace;
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static int __init set_raw_show_trace(char *str)
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{
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raw_show_trace = 1;
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return 1;
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}
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__setup("raw_show_trace", set_raw_show_trace);
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extern unsigned long unwind_stack(struct task_struct *task,
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unsigned long **sp, unsigned long pc);
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static void show_frametrace(struct task_struct *task, struct pt_regs *regs)
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{
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const int field = 2 * sizeof(unsigned long);
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unsigned long *stack = (long *)regs->regs[29];
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unsigned long pc = regs->cp0_epc;
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int top = 1;
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if (raw_show_trace || !__kernel_text_address(pc)) {
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show_trace(stack);
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return;
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}
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printk("Call Trace:\n");
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while (__kernel_text_address(pc)) {
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printk(" [<%0*lx>] ", field, pc);
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print_symbol("%s\n", pc);
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pc = unwind_stack(task, &stack, pc);
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if (top && pc == 0)
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pc = regs->regs[31]; /* leaf? */
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top = 0;
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}
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printk("\n");
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}
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#else
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#define show_frametrace(task, r) show_trace((long *)(r)->regs[29]);
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#endif
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/*
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* This routine abuses get_user()/put_user() to reference pointers
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* with at least a bit of error checking ...
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*/
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void show_stack(struct task_struct *task, unsigned long *sp)
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static void show_stacktrace(struct task_struct *task, struct pt_regs *regs)
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{
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const int field = 2 * sizeof(unsigned long);
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long stackdata;
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int i;
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unsigned long *stack;
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if (!sp) {
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if (task && task != current)
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sp = (unsigned long *) task->thread.reg29;
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else
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sp = (unsigned long *) &sp;
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}
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stack = sp;
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unsigned long *sp = (unsigned long *)regs->regs[29];
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printk("Stack :");
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i = 0;
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@ -136,7 +165,44 @@ void show_stack(struct task_struct *task, unsigned long *sp)
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i++;
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}
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printk("\n");
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show_trace(stack);
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show_frametrace(task, regs);
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}
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static noinline void prepare_frametrace(struct pt_regs *regs)
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{
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__asm__ __volatile__(
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"1: la $2, 1b\n\t"
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#ifdef CONFIG_64BIT
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"sd $2, %0\n\t"
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"sd $29, %1\n\t"
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"sd $31, %2\n\t"
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#else
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"sw $2, %0\n\t"
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"sw $29, %1\n\t"
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"sw $31, %2\n\t"
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#endif
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: "=m" (regs->cp0_epc),
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"=m" (regs->regs[29]), "=m" (regs->regs[31])
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: : "memory");
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}
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void show_stack(struct task_struct *task, unsigned long *sp)
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{
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struct pt_regs regs;
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if (sp) {
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regs.regs[29] = (unsigned long)sp;
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regs.regs[31] = 0;
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regs.cp0_epc = 0;
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} else {
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if (task && task != current) {
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regs.regs[29] = task->thread.reg29;
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regs.regs[31] = 0;
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regs.cp0_epc = task->thread.reg31;
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} else {
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prepare_frametrace(®s);
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}
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}
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show_stacktrace(task, ®s);
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}
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/*
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@ -146,6 +212,14 @@ void dump_stack(void)
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{
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unsigned long stack;
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#ifdef CONFIG_KALLSYMS
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if (!raw_show_trace) {
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struct pt_regs regs;
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prepare_frametrace(®s);
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show_frametrace(current, ®s);
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return;
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}
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#endif
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show_trace(&stack);
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}
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@ -265,7 +339,7 @@ void show_registers(struct pt_regs *regs)
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print_modules();
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printk("Process %s (pid: %d, threadinfo=%p, task=%p)\n",
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current->comm, current->pid, current_thread_info(), current);
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show_stack(current, (long *) regs->regs[29]);
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show_stacktrace(current, regs);
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show_code((unsigned int *) regs->cp0_epc);
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printk("\n");
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}
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