9db2541d4c
This adds a specific unwind plan for AArch64 Linux sigreturn frames. Previously we assumed that the fp would be valid here but it is not. https://github.com/torvalds/linux/blob/master/arch/arm64/kernel/vdso/sigreturn.S On Ubuntu Bionic it happened to point to an old frame info which meant you got what looked like a correct backtrace. On Focal, the info is completely invalid. (probably due to some code shuffling in libc) This adds an UnwindPlan that knows that the sp in a sigreturn frame points to an rt_sigframe from which we can offset to get saved sp and pc values to backtrace correctly. Based on LibUnwind's change: https://reviews.llvm.org/D90898 A new test is added that sets all compares the frames from the initial signal catch to the handler break. Ensuring that the stack/frame pointer, function name and register values match. (this test is AArch64 Linux specific because it's the only one with a specific unwind plan for this situation) Fixes https://bugs.llvm.org/show_bug.cgi?id=52165 Reviewed By: omjavaid, labath Differential Revision: https://reviews.llvm.org/D112069
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
//===-- PlatformLinux.h -----------------------------------------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLDB_SOURCE_PLUGINS_PLATFORM_LINUX_PLATFORMLINUX_H
|
|
#define LLDB_SOURCE_PLUGINS_PLATFORM_LINUX_PLATFORMLINUX_H
|
|
|
|
#include "Plugins/Platform/POSIX/PlatformPOSIX.h"
|
|
|
|
namespace lldb_private {
|
|
namespace platform_linux {
|
|
|
|
class PlatformLinux : public PlatformPOSIX {
|
|
public:
|
|
PlatformLinux(bool is_host);
|
|
|
|
static void Initialize();
|
|
|
|
static void Terminate();
|
|
|
|
// lldb_private::PluginInterface functions
|
|
static lldb::PlatformSP CreateInstance(bool force, const ArchSpec *arch);
|
|
|
|
static llvm::StringRef GetPluginNameStatic(bool is_host) {
|
|
return is_host ? Platform::GetHostPlatformName() : "remote-linux";
|
|
}
|
|
|
|
static llvm::StringRef GetPluginDescriptionStatic(bool is_host);
|
|
|
|
llvm::StringRef GetPluginName() override {
|
|
return GetPluginNameStatic(IsHost());
|
|
}
|
|
|
|
// lldb_private::Platform functions
|
|
llvm::StringRef GetDescription() override {
|
|
return GetPluginDescriptionStatic(IsHost());
|
|
}
|
|
|
|
void GetStatus(Stream &strm) override;
|
|
|
|
bool GetSupportedArchitectureAtIndex(uint32_t idx, ArchSpec &arch) override;
|
|
|
|
uint32_t GetResumeCountForLaunchInfo(ProcessLaunchInfo &launch_info) override;
|
|
|
|
bool CanDebugProcess() override;
|
|
|
|
void CalculateTrapHandlerSymbolNames() override;
|
|
|
|
lldb::UnwindPlanSP GetTrapHandlerUnwindPlan(const llvm::Triple &triple,
|
|
ConstString name) override;
|
|
|
|
MmapArgList GetMmapArgumentList(const ArchSpec &arch, lldb::addr_t addr,
|
|
lldb::addr_t length, unsigned prot,
|
|
unsigned flags, lldb::addr_t fd,
|
|
lldb::addr_t offset) override;
|
|
};
|
|
|
|
} // namespace platform_linux
|
|
} // namespace lldb_private
|
|
|
|
#endif // LLDB_SOURCE_PLUGINS_PLATFORM_LINUX_PLATFORMLINUX_H
|