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-rw-r--r--arch/parisc/Kconfig6
-rw-r--r--arch/parisc/kernel/Makefile1
-rw-r--r--arch/parisc/kernel/stacktrace.c63
3 files changed, 70 insertions, 0 deletions
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index aacf11d33723..4866e2f8d3bb 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -75,6 +75,9 @@ config GENERIC_HARDIRQS
75config GENERIC_IRQ_PROBE 75config GENERIC_IRQ_PROBE
76 def_bool y 76 def_bool y
77 77
78config HAVE_LATENCYTOP_SUPPORT
79 def_bool y
80
78config IRQ_PER_CPU 81config IRQ_PER_CPU
79 bool 82 bool
80 default y 83 default y
@@ -83,6 +86,9 @@ config IRQ_PER_CPU
83config PM 86config PM
84 bool 87 bool
85 88
89config STACKTRACE_SUPPORT
90 def_bool y
91
86config ISA_DMA_API 92config ISA_DMA_API
87 bool 93 bool
88 94
diff --git a/arch/parisc/kernel/Makefile b/arch/parisc/kernel/Makefile
index 016d3fc4111c..a7ba8cd9417f 100644
--- a/arch/parisc/kernel/Makefile
+++ b/arch/parisc/kernel/Makefile
@@ -16,5 +16,6 @@ obj-$(CONFIG_PA11) += pci-dma.o
16obj-$(CONFIG_PCI) += pci.o 16obj-$(CONFIG_PCI) += pci.o
17obj-$(CONFIG_MODULES) += module.o 17obj-$(CONFIG_MODULES) += module.o
18obj-$(CONFIG_64BIT) += binfmt_elf32.o sys_parisc32.o signal32.o 18obj-$(CONFIG_64BIT) += binfmt_elf32.o sys_parisc32.o signal32.o
19obj-$(CONFIG_STACKTRACE)+= stacktrace.o
19# only supported for PCX-W/U in 64-bit mode at the moment 20# only supported for PCX-W/U in 64-bit mode at the moment
20obj-$(CONFIG_64BIT) += perf.o perf_asm.o 21obj-$(CONFIG_64BIT) += perf.o perf_asm.o
diff --git a/arch/parisc/kernel/stacktrace.c b/arch/parisc/kernel/stacktrace.c
new file mode 100644
index 000000000000..2fe914c5f533
--- /dev/null
+++ b/arch/parisc/kernel/stacktrace.c
@@ -0,0 +1,63 @@
1/*
2 * Stack trace management functions
3 *
4 * Copyright (C) 2009 Helge Deller <deller@gmx.de>
5 * based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
6 * and parisc unwind functions by Randolph Chung <tausq@debian.org>
7 *
8 * TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
9 */
10#include <linux/module.h>
11#include <linux/stacktrace.h>
12
13#include <asm/unwind.h>
14
15static void dump_trace(struct task_struct *task, struct stack_trace *trace)
16{
17 struct unwind_frame_info info;
18
19 /* initialize unwind info */
20 if (task == current) {
21 unsigned long sp;
22 struct pt_regs r;
23HERE:
24 asm volatile ("copy %%r30, %0" : "=r"(sp));
25 memset(&r, 0, sizeof(struct pt_regs));
26 r.iaoq[0] = (unsigned long)&&HERE;
27 r.gr[2] = (unsigned long)__builtin_return_address(0);
28 r.gr[30] = sp;
29 unwind_frame_init(&info, task, &r);
30 } else {
31 unwind_frame_init_from_blocked_task(&info, task);
32 }
33
34 /* unwind stack and save entries in stack_trace struct */
35 trace->nr_entries = 0;
36 while (trace->nr_entries < trace->max_entries) {
37 if (unwind_once(&info) < 0 || info.ip == 0)
38 break;
39
40 if (__kernel_text_address(info.ip))
41 trace->entries[trace->nr_entries++] = info.ip;
42 }
43}
44
45
46/*
47 * Save stack-backtrace addresses into a stack_trace buffer.
48 */
49void save_stack_trace(struct stack_trace *trace)
50{
51 dump_trace(current, trace);
52 if (trace->nr_entries < trace->max_entries)
53 trace->entries[trace->nr_entries++] = ULONG_MAX;
54}
55EXPORT_SYMBOL_GPL(save_stack_trace);
56
57void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
58{
59 dump_trace(tsk, trace);
60 if (trace->nr_entries < trace->max_entries)
61 trace->entries[trace->nr_entries++] = ULONG_MAX;
62}
63EXPORT_SYMBOL_GPL(save_stack_trace_tsk);