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authorAndreas Sandberg <andreas.sandberg@arm.com>2016-06-20 14:39:49 +0100
committerAndreas Sandberg <andreas.sandberg@arm.com>2016-06-20 14:39:49 +0100
commit37bb0d0fb30a3548173253b0f19861a7ee4f8fce (patch)
treeee2e89b4a804e4bcaca76c0f38a359c1f5bab3c0 /src/arch/arm
parent60fb5e79f358b7d0784e4cfae4df9ec196e47f19 (diff)
downloadgem5-37bb0d0fb30a3548173253b0f19861a7ee4f8fce.tar.xz
kern, arm: Dump dmesg on kernel panic/oops
Add helper functions to dump the guest kernel's dmesg buffer to a text file in m5out. This functionality is split into two parts. First, a dmesg dump function that can be used in other places: void Linux::dumpDmesg(ThreadContext *, std::ostream &) This function is used to implement two PCEvents: DmesgDumpEvent and KernelPanic event. The only difference between the two is that the latter produces a gem5 panic instead of a warning in addition to dumping the kernel log. Change-Id: I6d2af1d666ace57124089648ea906f6c787ac63c Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-by: Gabor Dozsa <gabor.dozsa@arm.com>
Diffstat (limited to 'src/arch/arm')
-rw-r--r--src/arch/arm/ArmSystem.py8
-rw-r--r--src/arch/arm/linux/system.cc24
-rw-r--r--src/arch/arm/linux/system.hh6
3 files changed, 33 insertions, 5 deletions
diff --git a/src/arch/arm/ArmSystem.py b/src/arch/arm/ArmSystem.py
index adbf2093e..ac04a56e4 100644
--- a/src/arch/arm/ArmSystem.py
+++ b/src/arch/arm/ArmSystem.py
@@ -98,6 +98,14 @@ class LinuxArmSystem(GenericArmSystem):
type = 'LinuxArmSystem'
cxx_header = "arch/arm/linux/system.hh"
+ @classmethod
+ def export_method_cxx_predecls(cls, code):
+ code('#include "arch/arm/linux/system.hh"')
+
+ @classmethod
+ def export_methods(cls, code):
+ code('''void dumpDmesg();''')
+
class FreebsdArmSystem(GenericArmSystem):
type = 'FreebsdArmSystem'
cxx_header = "arch/arm/freebsd/system.hh"
diff --git a/src/arch/arm/linux/system.cc b/src/arch/arm/linux/system.cc
index a8eed49f1..311d81a37 100644
--- a/src/arch/arm/linux/system.cc
+++ b/src/arch/arm/linux/system.cc
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2010-2013 ARM Limited
+ * Copyright (c) 2010-2013, 2016 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -53,6 +53,7 @@
#include "cpu/thread_context.hh"
#include "debug/Loader.hh"
#include "kern/linux/events.hh"
+#include "kern/linux/helpers.hh"
#include "mem/fs_translating_port_proxy.hh"
#include "mem/physical.hh"
#include "sim/stat_control.hh"
@@ -65,14 +66,21 @@ LinuxArmSystem::LinuxArmSystem(Params *p)
enableContextSwitchStatsDump(p->enable_context_switch_stats_dump),
taskFile(nullptr), kernelPanicEvent(nullptr), kernelOopsEvent(nullptr)
{
+ const std::string dmesg_output = name() + ".dmesg";
if (p->panic_on_panic) {
- kernelPanicEvent = addKernelFuncEventOrPanic<PanicPCEvent>(
- "panic", "Kernel panic in simulated kernel");
+ kernelPanicEvent = addKernelFuncEventOrPanic<Linux::KernelPanicEvent>(
+ "panic", "Kernel panic in simulated kernel", dmesg_output);
+ } else {
+ kernelPanicEvent = addKernelFuncEventOrPanic<Linux::DmesgDumpEvent>(
+ "panic", "Kernel panic in simulated kernel", dmesg_output);
}
if (p->panic_on_oops) {
- kernelOopsEvent = addKernelFuncEventOrPanic<PanicPCEvent>(
- "oops_exit", "Kernel oops in guest");
+ kernelOopsEvent = addKernelFuncEventOrPanic<Linux::KernelPanicEvent>(
+ "oops_exit", "Kernel oops in guest", dmesg_output);
+ } else {
+ kernelOopsEvent = addKernelFuncEventOrPanic<Linux::DmesgDumpEvent>(
+ "oops_exit", "Kernel oops in guest", dmesg_output);
}
// With ARM udelay() is #defined to __udelay
@@ -261,6 +269,12 @@ LinuxArmSystem::mapPid(ThreadContext *tc, uint32_t pid)
}
}
+void
+LinuxArmSystem::dumpDmesg()
+{
+ Linux::dumpDmesg(getThreadContext(0), std::cout);
+}
+
/** This function is called whenever the the kernel function
* "__switch_to" is called to change running tasks.
*
diff --git a/src/arch/arm/linux/system.hh b/src/arch/arm/linux/system.hh
index ce1d84b6b..709776ffc 100644
--- a/src/arch/arm/linux/system.hh
+++ b/src/arch/arm/linux/system.hh
@@ -95,6 +95,12 @@ class LinuxArmSystem : public GenericArmSystem
* @param tc thread context that is currentyl executing */
void mapPid(ThreadContext* tc, uint32_t pid);
+ public: // Exported Python methods
+ /**
+ * Dump the kernel's dmesg buffer to stdout
+ */
+ void dumpDmesg();
+
private:
/** Event to halt the simulator if the kernel calls panic() */
PCEvent *kernelPanicEvent;