History log of /system/core/debuggerd/arm/machine.c
Revision Date Author Comments (<<< Hide modified files) (Show modified files >>>)
c47b772b67a2da5599b712e8c98cb0879dad6e48 24-Sep-2012 Ben Cheng <bccheng@google.com> Dump 256 bytes per chunk pointed by general-purpose registers.

Bug: 7216522
Change-Id: Iddcec8399b00ad411be6863dd866a3f74377ba03
053b865412d1982ad1dc0e840898d82527deeb99 07-Jun-2012 Jeff Brown <jeffbrown@google.com> Enhance native stack dumps.

Provides a new mechanism for dumpstate (while running as root)
to request that debuggerd dump the stacks of native processes that
we care about in bug reports. In this mode, the backtrace
is formatted to look similar to a Dalvik backtrace.

Moved the tombstone generating code into a separate file to
make it easier to maintain.

Fixed a bug where sometimes the stack traces would be incomplete
because we were not waiting for each thread to stop after issuing
PTRACE_ATTACH, only the main thread. So sometimes we were missing
traces for some threads.

Refactored the logging code to prevent accidentally writing data
to logcat when explicitly dumping a tombstone or backtrace from the

Only root or system server can request to dump backtraces but
only root can dump tombstones.

Bug: 6615693
Change-Id: Ib3edcc16f9f3a687e414e3f2d250d9500566123b
f0c5872637a63e28e3cd314cfc915c07f76df9c6 04-Nov-2011 Jeff Brown <jeffbrown@google.com> Improve stack unwinder robustness.

Keep track of whether memory maps are readable. Use the information
in try_get_word to try to avoid accidentally dereferencing an invalid
pointer within the current process. (Note that I haven't ever
seen that happen during normal unwinding, but it pays to be
a little more careful.)

Refactored try_get_word a little to make it easier to pass it the
needed state for validation checks by way of a little memory_t struct.

Improved how the memory map for the current process is cached. This is
important because we need up to date information about readable maps.
Use a 5 second cache expiration.

Improved the PC -> LR fallback logic in the unwinder so we can
eke out an extra frame sometimes.

Fixed a bug reading ELF program headers. The phnum & phentsize
fields are half-words. We were incorrectly interpreting
phnum as a whole word.

Used android_atomic_* operations carefully in the unwinder
to prevent possible memory races between the dumper and the dumpee.
This was highly unlikely (or even impossible due to the presence
of other barriers along the way) but the code is clearer now about
its invariants.

Fixed a bug in debuggerd where the pid was being passed to have
its stack dump taken instead of the tid, resulting in short
stacks because ptrace couldn't read the data if pid != tid.
Did a full sweep to ensure that we use pid / tid correctly everywhere.

Ported old code from debuggerd to rewind the program counter back
one instruction so that it points to the branch instruction itself
instead of the return address.

Change-Id: Icc4eb08320052975a4ae7f0f5f0ac9308a2d33d7
9524e4158fbb988b6a5e4f5be68ee10b7e4dd6d8 24-Oct-2011 Jeff Brown <jeffbrown@google.com> Add support for explicitly dumping native stacks.

This change modifies debuggerd so that it can be used to grab
the native stacks of a process that has hung and not just crashed.
Note that only the root user can do this (for now).

adb shell debuggerd <tid>

Then use logcat to find the tombstone file that was generated
which will have the native stacks of all threads in the
requested process. The specified thread will be shown first
and will also appear in the main log.

Also made some minor tweaks to libcorkscrew so that we
could handle statically compiled executables in the future
if we compiled the library statically.

Improved the "wait_for_user_action" function to support
volume down as an alternative for devices that do not
have home keys.

Removed a mess of gotos.

Change-Id: Ic149653986b0c2f503c7f0e8b7cb1f3be7c84d1e
13e715b491e876865e752a3a69dd6f347049a488 21-Oct-2011 Jeff Brown <jeffbrown@google.com> Use libcorkscrew in debuggerd.

Change-Id: I5e3645a39d96c808f87075b49111d0262a19a0c8
08dedcfd5cfeab526bb02382e4292f3150ed986f 19-Oct-2011 Andy McFadden <fadden@android.com> Enable verbose register memory dumps

Dump some memory at addresses for all registers that look like they
might have valid addresses. Previously this was only done for PC
and LR.

(This is expected to be disabled before ship.)

Bug 5484924

Change-Id: I9802eaa396783e1286ae0c53eaf2473892c38a02
e5cc5396e83d12b7ca02ff6096a9950807aa010d 19-Oct-2011 Andy McFadden <fadden@android.com> Add log summary to tombstones

When the tombstones are uploaded to APR, they're truncated at 64KB.
This causes the log data, which is at the end, to be lost if the
process has more than about 12 threads (which many do).

This change adds the last few lines of the log right below the
report for the crashing thread, where we should be guaranteed to
keep it.

Also, clean up trailing newlines on log messages (which end up in
the tombstone), and don't print a "------- log" banner if there
aren't any messages in that log file (e.g. slog).

Also also, don't try to show_nearby_maps unless this is the crashing

Bug 5471955

Change-Id: Iaa4fd2fafbaeda2f20bb95f202177d7744a91f9d
f2eae5a860ebdf0dd47669c9bf58b8824b57728c 19-Oct-2011 Andy McFadden <fadden@android.com> Enhance debuggerd memory dumps

This makes two changes:

(1) Display ASCII values next to the memory dumps. For example:

I DEBUG: 00008ac4 706f6f4c 20676e69 74206425 73656d69 Looping %d times
I DEBUG: 00008ad4 7453000a 6e69726f 6f742067 0a702520 ..Storing to %p.
I DEBUG: 00008ae4 65642f00 657a2f76 55006f72 6c62616e ./dev/zero.Unabl

(The hex values are still displayed as little-endian word values, while
the ASCII part is byte oriented.)

(2) Optionally display memory dumps for all registers, not just LR
and PC, for the crashing thread. This is meant for situations where
we crash dereferencing foo->bar and want to see what the memory near
"foo" looks like -- could be handy if it got stomped by MUTF-16 text
or something recognizable.

Change #2 is currently disabled, via a compile-time setting.

Bug 5471955

Change-Id: Iacfd01c314055bad81db2f43b7d239f10086fcfb
136dcc5ce628a1ba600a6818e5cb24d5f15eb016 23-Sep-2011 Andy McFadden <fadden@android.com> Show maps near native fault address

This adds some additional output to native crashes. For example, if
something tried to access a bit of mmap(/dev/zero) memory that had
been mprotect()ed, you might see output like this:

I DEBUG : memory map around addr 4015a00c:
I DEBUG : 40159000-4015a000 /system/lib/libstdc++.so
I DEBUG : 4015a000-40162000 /dev/zero
I DEBUG : b0001000-b0009000 /system/bin/linker

The idea is to see what's in and around the fault address to make it
easier to identify bus errors due to file truncation and segmentation
faults caused by buffer over/underruns.

No output is generated for accesses below 0x1000 (which are likely
NULL pointer dereferences) or for signals that don't set si_addr.

Also, suppress the fault address for signals that don't set si_addr:
I DEBUG : signal 6 (SIGABRT), code 0 (?), fault addr --------

We still print "fault addr" followed by 8 characters for anything
that is parsing the contents. The "address" shown for signals like
SIGABRT was meaningless and possibly confusing.

Bug 5358516

Change-Id: Icae8ef309ea2d89b129f68d30f96b2ca8a69cc6c
dce4d06b5c92f375bcf2efcb5b2d87d7566d04f2 25-Feb-2011 Ben Cheng <bccheng@android.com> Fix overflow prevention code in memory dump.

The delta between start and end pointers in memory dump has to be
multiples of 4 or 16.

Bug: 3486787
Change-Id: Ie34aa79ffb704ca647805dbc6a16f2c35adf849c
2c259914a0c5d49a3fcb525a75f4817a3a99a6c8 26-Jan-2011 David 'Digit' Turner <digit@google.com> debuggerd: Fix missing include.

The structure user_vfp is incorrectly defined in bionic/libc/kernel/arch-arm/asm/ptrace.h
at the moment, while it should be under bionic/libc/kernel/arch-arm/asm/user.h instead.

Before moving its definition in the corresponding source files, we need to fix its users.
It happens that debuggerd is the only one for now, so fix this by including <linux/user.h>
instead (which will include <asm/user.h> and <asm/ptrace.h>).

Also, make the debug output less chatty by specifying all symbols to be listed
through XLOG2 instead of XLOG.

Change-Id: I16e0fa700945d86efd44ee885a84ad609c0a9b58
3227b5c25f17b19d65e1fe7ec27e62c5430bd258 15-Dec-2010 Paul Eastham <eastham@google.com> Prevent rollover when dumping data around PC, SP, etc.

Change-Id: Ifc5f0e8eb5fed191c39f0878869e04b4d4f3b9ca
849249064cae9c1bb23b0204b5d35b832567801e 13-Oct-2010 Bruce Beare <bruce.j.beare@intel.com> debuggerd: Reorganize to facilitate IA commit

Change-Id: I22dd02daf617672fc0a8ba7e396017c57f17e26e
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>