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Make x86-64 stack walking work for Native Client minidumps

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For NaCl, a stack walker should ignore the top 32 bits of %rip, %rsp
and %rbp, otherwise it will try to read from %r15-extended stack
addresses and look up symbol info for %r15-extended code addresses,
which will fail.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3424
TEST=tested manually with a NaCl minidump

Review URL: https://breakpad.appspot.com/591002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1173 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
mseaborn@chromium.org 2013-05-08 02:37:15 +00:00
parent 85c352695f
commit b45b97b2fd
2 changed files with 16 additions and 4 deletions
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9
src/google_breakpad/processor/system_info.h
View File

@ -63,10 +63,11 @@ struct SystemInfo {
string os;
// A short form of the os string, using lowercase letters and no spaces,
// suitable for use in a filesystem. Possible values are "windows",
// "mac", and "linux". Empty if the information is not present in the dump
// or if the OS given by the dump is unknown. The values stored in this
// field should match those used by MinidumpSystemInfo::GetOS.
// suitable for use in a filesystem. Possible values include "windows",
// "mac", "linux" and "nacl". Empty if the information is not present
// in the dump or if the OS given by the dump is unknown. The values
// stored in this field should match those used by
// MinidumpSystemInfo::GetOS.
string os_short;
// A string identifying the version of the operating system, such as

11
src/processor/stackwalker_amd64.cc
View File

@ -40,6 +40,7 @@
#include "google_breakpad/processor/memory_region.h"
#include "google_breakpad/processor/source_line_resolver_interface.h"
#include "google_breakpad/processor/stack_frame_cpu.h"
#include "google_breakpad/processor/system_info.h"
#include "processor/cfi_frame_info.h"
#include "processor/logging.h"
#include "processor/stackwalker_amd64.h"
@ -222,6 +223,16 @@ StackFrame* StackwalkerAMD64::GetCallerFrame(const CallStack* stack) {
if (!new_frame.get())
return NULL;
if (system_info_->os_short == "nacl") {
// Apply constraints from Native Client's x86-64 sandbox. These
// registers have the 4GB-aligned sandbox base address (from r15)
// added to them, and only the bottom 32 bits are relevant for
// stack walking.
new_frame->context.rip = static_cast<uint32_t>(new_frame->context.rip);
new_frame->context.rsp = static_cast<uint32_t>(new_frame->context.rsp);
new_frame->context.rbp = static_cast<uint32_t>(new_frame->context.rbp);
}
// Treat an instruction address of 0 as end-of-stack.
if (new_frame->context.rip == 0)
return NULL;