diff options
author | Daniel Walter <dwalter@google.com> | 2014-08-20 13:56:00 +0400 |
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committer | Richard Weinberger <richard@nod.at> | 2014-10-13 23:46:25 +0400 |
commit | 970e51feaddbc33ed0e7d187af7f69d1a12c7b6a (patch) | |
tree | dbe47fda5a1271dc5404c9c96d7965a870320fc2 /arch/um/kernel/stacktrace.c | |
parent | 2a2361228c5e6d8c1733f00653481de918598e50 (diff) | |
download | linux-970e51feaddbc33ed0e7d187af7f69d1a12c7b6a.tar.xz |
um: Add support for CONFIG_STACKTRACE
Add stacktrace support for User Mode Linux
Signed-off-by: Daniel Walter <dwalter@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/kernel/stacktrace.c')
-rw-r--r-- | arch/um/kernel/stacktrace.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/um/kernel/stacktrace.c b/arch/um/kernel/stacktrace.c new file mode 100644 index 000000000000..ebe7bcf62684 --- /dev/null +++ b/arch/um/kernel/stacktrace.c @@ -0,0 +1,80 @@ +/* + * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + * Copyright (C) 2013 Richard Weinberger <richard@nod.at> + * Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kallsyms.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/stacktrace.h> +#include <linux/module.h> +#include <linux/uaccess.h> +#include <asm/stacktrace.h> + +void dump_trace(struct task_struct *tsk, + const struct stacktrace_ops *ops, + void *data) +{ + int reliable = 0; + unsigned long *sp, bp, addr; + struct pt_regs *segv_regs = tsk->thread.segv_regs; + struct stack_frame *frame; + + bp = get_frame_pointer(tsk, segv_regs); + sp = get_stack_pointer(tsk, segv_regs); + + frame = (struct stack_frame *)bp; + while (((long) sp & (THREAD_SIZE-1)) != 0) { + addr = *sp; + if (__kernel_text_address(addr)) { + reliable = 0; + if ((unsigned long) sp == bp + sizeof(long)) { + frame = frame ? frame->next_frame : NULL; + bp = (unsigned long)frame; + reliable = 1; + } + ops->address(data, addr, reliable); + } + sp++; + } +} + +static void save_addr(void *data, unsigned long address, int reliable) +{ + struct stack_trace *trace = data; + + if (!reliable) + return; + if (trace->nr_entries >= trace->max_entries) + return; + + trace->entries[trace->nr_entries++] = address; +} + +static const struct stacktrace_ops dump_ops = { + .address = save_addr +}; + +static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace) +{ + dump_trace(tsk, &dump_ops, trace); + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = ULONG_MAX; +} + +void save_stack_trace(struct stack_trace *trace) +{ + __save_stack_trace(current, trace); +} +EXPORT_SYMBOL_GPL(save_stack_trace); + +void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) +{ + __save_stack_trace(tsk, trace); +} +EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |