[Lldb-commits] [lldb] Reapply "[LLDB][ELF Core] Support all the Generic (Negative) SI Codes." (PR #141670)
Jacob Lalonde via lldb-commits
lldb-commits at lists.llvm.org
Wed May 28 09:29:28 PDT 2025
https://github.com/Jlalond updated https://github.com/llvm/llvm-project/pull/141670
>From 048cc769d6380bcb899bbcc5acf7f9349b51c5d3 Mon Sep 17 00:00:00 2001
From: Jacob Lalonde <jalalonde at fb.com>
Date: Tue, 27 May 2025 13:40:40 -0700
Subject: [PATCH 1/5] Reapply "[LLDB][ELF Core] Support all the Generic
(Negative) SI Codes." (#141645)
This reverts commit 9d33b9291318c117429ab461c2119c108abd6ed2.
---
lldb/include/lldb/Target/Platform.h | 3 +
lldb/include/lldb/Target/UnixSignals.h | 6 +-
.../Plugins/Platform/Linux/PlatformLinux.cpp | 105 ++++++++++++
.../Plugins/Platform/Linux/PlatformLinux.h | 2 +
.../Plugins/Process/Utility/LinuxSignals.cpp | 154 ++++++++++--------
.../Process/elf-core/ProcessElfCore.cpp | 20 +--
.../Process/elf-core/ThreadElfCore.cpp | 136 +++++-----------
.../Plugins/Process/elf-core/ThreadElfCore.h | 75 +++------
lldb/source/Target/UnixSignals.cpp | 15 +-
lldb/unittests/Signals/UnixSignalsTest.cpp | 9 +
10 files changed, 295 insertions(+), 230 deletions(-)
diff --git a/lldb/include/lldb/Target/Platform.h b/lldb/include/lldb/Target/Platform.h
index a702abb540fd9..35ffdabf907e7 100644
--- a/lldb/include/lldb/Target/Platform.h
+++ b/lldb/include/lldb/Target/Platform.h
@@ -21,6 +21,7 @@
#include "lldb/Core/UserSettingsController.h"
#include "lldb/Host/File.h"
#include "lldb/Interpreter/Options.h"
+#include "lldb/Target/StopInfo.h"
#include "lldb/Utility/ArchSpec.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/Utility/FileSpec.h"
@@ -960,6 +961,8 @@ class Platform : public PluginInterface {
virtual CompilerType GetSiginfoType(const llvm::Triple &triple);
+ virtual lldb::StopInfoSP GetStopInfoFromSiginfo(Thread &thread) { return {}; }
+
virtual Args GetExtraStartupCommands();
typedef std::function<Status(const ModuleSpec &module_spec,
diff --git a/lldb/include/lldb/Target/UnixSignals.h b/lldb/include/lldb/Target/UnixSignals.h
index b3605ccefddbe..a1807d69f329b 100644
--- a/lldb/include/lldb/Target/UnixSignals.h
+++ b/lldb/include/lldb/Target/UnixSignals.h
@@ -36,7 +36,9 @@ class UnixSignals {
std::optional<int32_t> code = std::nullopt,
std::optional<lldb::addr_t> addr = std::nullopt,
std::optional<lldb::addr_t> lower = std::nullopt,
- std::optional<lldb::addr_t> upper = std::nullopt) const;
+ std::optional<lldb::addr_t> upper = std::nullopt,
+ std::optional<uint32_t> pid = std::nullopt,
+ std::optional<uint32_t> uid = std::nullopt) const;
bool SignalIsValid(int32_t signo) const;
@@ -105,7 +107,7 @@ class UnixSignals {
llvm::StringRef description,
llvm::StringRef alias = llvm::StringRef());
- enum SignalCodePrintOption { None, Address, Bounds };
+ enum SignalCodePrintOption { None, Address, Bounds, Sender };
// Instead of calling this directly, use a ADD_SIGCODE macro to get compile
// time checks when on the native platform.
diff --git a/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp b/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp
index 9db2c83acc125..cb60caf1cb422 100644
--- a/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp
+++ b/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp
@@ -14,6 +14,7 @@
#include <sys/utsname.h>
#endif
+#include "Plugins/Process/Utility/LinuxSignals.h"
#include "Utility/ARM64_DWARF_Registers.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/PluginManager.h"
@@ -480,3 +481,107 @@ CompilerType PlatformLinux::GetSiginfoType(const llvm::Triple &triple) {
ast->CompleteTagDeclarationDefinition(siginfo_type);
return siginfo_type;
}
+
+static std::string GetDescriptionFromSiginfo(lldb::ValueObjectSP siginfo_sp) {
+ if (!siginfo_sp)
+ return "";
+
+ lldb_private::LinuxSignals linux_signals;
+ int code = siginfo_sp->GetChildMemberWithName("si_code")->GetValueAsSigned(0);
+ int signo =
+ siginfo_sp->GetChildMemberWithName("si_signo")->GetValueAsSigned(-1);
+
+ auto sifields = siginfo_sp->GetChildMemberWithName("_sifields");
+ if (!sifields)
+ return linux_signals.GetSignalDescription(signo, code);
+
+ // declare everything that we can populate later.
+ std::optional<lldb::addr_t> addr;
+ std::optional<lldb::addr_t> upper;
+ std::optional<lldb::addr_t> lower;
+ std::optional<uint32_t> pid;
+ std::optional<uint32_t> uid;
+
+ // The negative si_codes are special and mean this signal was sent from user
+ // space not the kernel. These take precedence because they break some of the
+ // invariants around kernel sent signals. Such as SIGSEGV won't have an
+ // address.
+ if (code < 0) {
+ auto sikill = sifields->GetChildMemberWithName("_kill");
+ if (sikill) {
+ auto pid_sp = sikill->GetChildMemberWithName("si_pid");
+ if (pid_sp)
+ pid = pid_sp->GetValueAsUnsigned(-1);
+ auto uid_sp = sikill->GetChildMemberWithName("si_uid");
+ if (uid_sp)
+ uid = uid_sp->GetValueAsUnsigned(-1);
+ }
+ } else {
+
+ switch (signo) {
+ case SIGILL:
+ case SIGFPE:
+ case SIGBUS: {
+ auto sigfault = sifields->GetChildMemberWithName("_sigfault");
+ if (!sigfault)
+ break;
+
+ auto addr_sp = sigfault->GetChildMemberWithName("si_addr");
+ if (addr_sp)
+ addr = addr_sp->GetValueAsUnsigned(-1);
+ break;
+ }
+ case SIGSEGV: {
+ auto sigfault = sifields->GetChildMemberWithName("_sigfault");
+ if (!sigfault)
+ break;
+
+ auto addr_sp = sigfault->GetChildMemberWithName("si_addr");
+ if (addr_sp)
+ addr = addr_sp->GetValueAsUnsigned(-1);
+
+ auto bounds_sp = sigfault->GetChildMemberWithName("_bounds");
+ if (!bounds_sp)
+ break;
+
+ auto addr_bnds_sp = bounds_sp->GetChildMemberWithName("_addr_bnd");
+ if (!addr_bnds_sp)
+ break;
+
+ auto lower_sp = addr_bnds_sp->GetChildMemberWithName("_lower");
+ if (lower_sp)
+ lower = lower_sp->GetValueAsUnsigned(-1);
+
+ auto upper_sp = addr_bnds_sp->GetChildMemberWithName("_upper");
+ if (upper_sp)
+ upper = upper_sp->GetValueAsUnsigned(-1);
+
+ break;
+ }
+ default:
+ break;
+ }
+ }
+
+ return linux_signals.GetSignalDescription(signo, code, addr, lower, upper,
+ uid, pid);
+}
+
+lldb::StopInfoSP PlatformLinux::GetStopInfoFromSiginfo(Thread &thread) {
+ ValueObjectSP siginfo_sp = thread.GetSiginfoValue();
+ if (!siginfo_sp)
+ return {};
+ auto signo_sp = siginfo_sp->GetChildMemberWithName("si_signo");
+ auto sicode_sp = siginfo_sp->GetChildMemberWithName("si_code");
+ if (!signo_sp || !sicode_sp)
+ return {};
+
+ std::string siginfo_description = GetDescriptionFromSiginfo(siginfo_sp);
+ if (siginfo_description.empty())
+ return StopInfo::CreateStopReasonWithSignal(
+ thread, signo_sp->GetValueAsUnsigned(-1));
+
+ return StopInfo::CreateStopReasonWithSignal(
+ thread, signo_sp->GetValueAsUnsigned(-1), siginfo_description.c_str(),
+ sicode_sp->GetValueAsUnsigned(0));
+}
diff --git a/lldb/source/Plugins/Platform/Linux/PlatformLinux.h b/lldb/source/Plugins/Platform/Linux/PlatformLinux.h
index 89f0bd709ef60..0fd33b03dcd23 100644
--- a/lldb/source/Plugins/Platform/Linux/PlatformLinux.h
+++ b/lldb/source/Plugins/Platform/Linux/PlatformLinux.h
@@ -62,6 +62,8 @@ class PlatformLinux : public PlatformPOSIX {
CompilerType GetSiginfoType(const llvm::Triple &triple) override;
+ lldb::StopInfoSP GetStopInfoFromSiginfo(Thread &thread) override;
+
std::vector<ArchSpec> m_supported_architectures;
private:
diff --git a/lldb/source/Plugins/Process/Utility/LinuxSignals.cpp b/lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
index 9c4fe55147a28..76c32e376eb4b 100644
--- a/lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
+++ b/lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
@@ -38,6 +38,28 @@
#define ADD_SIGCODE(signal_name, signal_value, code_name, code_value, ...) \
AddSignalCode(signal_value, code_value, __VA_ARGS__)
#endif /* if defined(__linux__) && !defined(__mips__) */
+// See siginfo.h in the Linux Kernel, these codes can be sent for any signal.
+#define ADD_LINUX_SIGNAL(signo, name, ...) \
+ AddSignal(signo, name, __VA_ARGS__); \
+ ADD_SIGCODE(signo, signo, SI_QUEUE, -1, "sent by sigqueue", \
+ SignalCodePrintOption::Sender); \
+ ADD_SIGCODE(signo, signo, SI_TIMER, -2, "sent by timer expiration", \
+ SignalCodePrintOption::Sender); \
+ ADD_SIGCODE(signo, signo, SI_MESGQ, -3, \
+ "sent by real time mesq state change", \
+ SignalCodePrintOption::Sender); \
+ ADD_SIGCODE(signo, signo, SI_ASYNCIO, -4, "sent by AIO completion", \
+ SignalCodePrintOption::Sender); \
+ ADD_SIGCODE(signo, signo, SI_SIGIO, -5, "sent by queued SIGIO", \
+ SignalCodePrintOption::Sender); \
+ ADD_SIGCODE(signo, signo, SI_TKILL, -6, "sent by tkill system call", \
+ SignalCodePrintOption::Sender); \
+ ADD_SIGCODE(signo, signo, SI_DETHREAD, -7, \
+ "sent by execve() killing subsidiary threads", \
+ SignalCodePrintOption::Sender); \
+ ADD_SIGCODE(signo, signo, SI_ASYNCNL, -60, \
+ "sent by glibc async name lookup completion", \
+ SignalCodePrintOption::Sender);
using namespace lldb_private;
@@ -46,13 +68,13 @@ LinuxSignals::LinuxSignals() : UnixSignals() { Reset(); }
void LinuxSignals::Reset() {
m_signals.clear();
// clang-format off
- // SIGNO NAME SUPPRESS STOP NOTIFY DESCRIPTION
- // ====== ============== ======== ====== ====== ===================================================
- AddSignal(1, "SIGHUP", false, true, true, "hangup");
- AddSignal(2, "SIGINT", true, true, true, "interrupt");
- AddSignal(3, "SIGQUIT", false, true, true, "quit");
+ // SIGNO NAME SUPPRESS STOP NOTIFY DESCRIPTION
+ // ====== ============== ======== ====== ====== ===================================================
+ ADD_LINUX_SIGNAL(1, "SIGHUP", false, true, true, "hangup");
+ ADD_LINUX_SIGNAL(2, "SIGINT", true, true, true, "interrupt");
+ ADD_LINUX_SIGNAL(3, "SIGQUIT", false, true, true, "quit");
- AddSignal(4, "SIGILL", false, true, true, "illegal instruction");
+ ADD_LINUX_SIGNAL(4, "SIGILL", false, true, true, "illegal instruction");
ADD_SIGCODE(SIGILL, 4, ILL_ILLOPC, 1, "illegal opcode");
ADD_SIGCODE(SIGILL, 4, ILL_ILLOPN, 2, "illegal operand");
ADD_SIGCODE(SIGILL, 4, ILL_ILLADR, 3, "illegal addressing mode");
@@ -62,15 +84,15 @@ void LinuxSignals::Reset() {
ADD_SIGCODE(SIGILL, 4, ILL_COPROC, 7, "coprocessor error");
ADD_SIGCODE(SIGILL, 4, ILL_BADSTK, 8, "internal stack error");
- AddSignal(5, "SIGTRAP", true, true, true, "trace trap (not reset when caught)");
- AddSignal(6, "SIGABRT", false, true, true, "abort()/IOT trap", "SIGIOT");
+ ADD_LINUX_SIGNAL(5, "SIGTRAP", true, true, true, "trace trap (not reset when caught)");
+ ADD_LINUX_SIGNAL(6, "SIGABRT", false, true, true, "abort()/IOT trap", "SIGIOT");
- AddSignal(7, "SIGBUS", false, true, true, "bus error");
+ ADD_LINUX_SIGNAL(7, "SIGBUS", false, true, true, "bus error");
ADD_SIGCODE(SIGBUS, 7, BUS_ADRALN, 1, "illegal alignment");
ADD_SIGCODE(SIGBUS, 7, BUS_ADRERR, 2, "illegal address");
ADD_SIGCODE(SIGBUS, 7, BUS_OBJERR, 3, "hardware error");
- AddSignal(8, "SIGFPE", false, true, true, "floating point exception");
+ ADD_LINUX_SIGNAL(8, "SIGFPE", false, true, true, "floating point exception");
ADD_SIGCODE(SIGFPE, 8, FPE_INTDIV, 1, "integer divide by zero");
ADD_SIGCODE(SIGFPE, 8, FPE_INTOVF, 2, "integer overflow");
ADD_SIGCODE(SIGFPE, 8, FPE_FLTDIV, 3, "floating point divide by zero");
@@ -80,10 +102,10 @@ void LinuxSignals::Reset() {
ADD_SIGCODE(SIGFPE, 8, FPE_FLTINV, 7, "floating point invalid operation");
ADD_SIGCODE(SIGFPE, 8, FPE_FLTSUB, 8, "subscript out of range");
- AddSignal(9, "SIGKILL", false, true, true, "kill");
- AddSignal(10, "SIGUSR1", false, true, true, "user defined signal 1");
+ ADD_LINUX_SIGNAL(9, "SIGKILL", false, true, true, "kill");
+ ADD_LINUX_SIGNAL(10, "SIGUSR1", false, true, true, "user defined signal 1");
- AddSignal(11, "SIGSEGV", false, true, true, "segmentation violation");
+ ADD_LINUX_SIGNAL(11, "SIGSEGV", false, true, true, "segmentation violation");
ADD_SIGCODE(SIGSEGV, 11, SEGV_MAPERR, 1, "address not mapped to object", SignalCodePrintOption::Address);
ADD_SIGCODE(SIGSEGV, 11, SEGV_ACCERR, 2, "invalid permissions for mapped object", SignalCodePrintOption::Address);
ADD_SIGCODE(SIGSEGV, 11, SEGV_BNDERR, 3, "failed address bounds checks", SignalCodePrintOption::Bounds);
@@ -94,58 +116,58 @@ void LinuxSignals::Reset() {
// codes. One way to get this is via unaligned SIMD loads. Treat it as invalid address.
ADD_SIGCODE(SIGSEGV, 11, SI_KERNEL, 0x80, "invalid address", SignalCodePrintOption::Address);
- AddSignal(12, "SIGUSR2", false, true, true, "user defined signal 2");
- AddSignal(13, "SIGPIPE", false, true, true, "write to pipe with reading end closed");
- AddSignal(14, "SIGALRM", false, false, false, "alarm");
- AddSignal(15, "SIGTERM", false, true, true, "termination requested");
- AddSignal(16, "SIGSTKFLT", false, true, true, "stack fault");
- AddSignal(17, "SIGCHLD", false, false, true, "child status has changed", "SIGCLD");
- AddSignal(18, "SIGCONT", false, false, true, "process continue");
- AddSignal(19, "SIGSTOP", true, true, true, "process stop");
- AddSignal(20, "SIGTSTP", false, true, true, "tty stop");
- AddSignal(21, "SIGTTIN", false, true, true, "background tty read");
- AddSignal(22, "SIGTTOU", false, true, true, "background tty write");
- AddSignal(23, "SIGURG", false, true, true, "urgent data on socket");
- AddSignal(24, "SIGXCPU", false, true, true, "CPU resource exceeded");
- AddSignal(25, "SIGXFSZ", false, true, true, "file size limit exceeded");
- AddSignal(26, "SIGVTALRM", false, true, true, "virtual time alarm");
- AddSignal(27, "SIGPROF", false, false, false, "profiling time alarm");
- AddSignal(28, "SIGWINCH", false, true, true, "window size changes");
- AddSignal(29, "SIGIO", false, true, true, "input/output ready/Pollable event", "SIGPOLL");
- AddSignal(30, "SIGPWR", false, true, true, "power failure");
- AddSignal(31, "SIGSYS", false, true, true, "invalid system call");
- AddSignal(32, "SIG32", false, false, false, "threading library internal signal 1");
- AddSignal(33, "SIG33", false, false, false, "threading library internal signal 2");
- AddSignal(34, "SIGRTMIN", false, false, false, "real time signal 0");
- AddSignal(35, "SIGRTMIN+1", false, false, false, "real time signal 1");
- AddSignal(36, "SIGRTMIN+2", false, false, false, "real time signal 2");
- AddSignal(37, "SIGRTMIN+3", false, false, false, "real time signal 3");
- AddSignal(38, "SIGRTMIN+4", false, false, false, "real time signal 4");
- AddSignal(39, "SIGRTMIN+5", false, false, false, "real time signal 5");
- AddSignal(40, "SIGRTMIN+6", false, false, false, "real time signal 6");
- AddSignal(41, "SIGRTMIN+7", false, false, false, "real time signal 7");
- AddSignal(42, "SIGRTMIN+8", false, false, false, "real time signal 8");
- AddSignal(43, "SIGRTMIN+9", false, false, false, "real time signal 9");
- AddSignal(44, "SIGRTMIN+10", false, false, false, "real time signal 10");
- AddSignal(45, "SIGRTMIN+11", false, false, false, "real time signal 11");
- AddSignal(46, "SIGRTMIN+12", false, false, false, "real time signal 12");
- AddSignal(47, "SIGRTMIN+13", false, false, false, "real time signal 13");
- AddSignal(48, "SIGRTMIN+14", false, false, false, "real time signal 14");
- AddSignal(49, "SIGRTMIN+15", false, false, false, "real time signal 15");
- AddSignal(50, "SIGRTMAX-14", false, false, false, "real time signal 16"); // switching to SIGRTMAX-xxx to match "kill -l" output
- AddSignal(51, "SIGRTMAX-13", false, false, false, "real time signal 17");
- AddSignal(52, "SIGRTMAX-12", false, false, false, "real time signal 18");
- AddSignal(53, "SIGRTMAX-11", false, false, false, "real time signal 19");
- AddSignal(54, "SIGRTMAX-10", false, false, false, "real time signal 20");
- AddSignal(55, "SIGRTMAX-9", false, false, false, "real time signal 21");
- AddSignal(56, "SIGRTMAX-8", false, false, false, "real time signal 22");
- AddSignal(57, "SIGRTMAX-7", false, false, false, "real time signal 23");
- AddSignal(58, "SIGRTMAX-6", false, false, false, "real time signal 24");
- AddSignal(59, "SIGRTMAX-5", false, false, false, "real time signal 25");
- AddSignal(60, "SIGRTMAX-4", false, false, false, "real time signal 26");
- AddSignal(61, "SIGRTMAX-3", false, false, false, "real time signal 27");
- AddSignal(62, "SIGRTMAX-2", false, false, false, "real time signal 28");
- AddSignal(63, "SIGRTMAX-1", false, false, false, "real time signal 29");
- AddSignal(64, "SIGRTMAX", false, false, false, "real time signal 30");
+ ADD_LINUX_SIGNAL(12, "SIGUSR2", false, true, true, "user defined signal 2");
+ ADD_LINUX_SIGNAL(13, "SIGPIPE", false, true, true, "write to pipe with reading end closed");
+ ADD_LINUX_SIGNAL(14, "SIGALRM", false, false, false, "alarm");
+ ADD_LINUX_SIGNAL(15, "SIGTERM", false, true, true, "termination requested");
+ ADD_LINUX_SIGNAL(16, "SIGSTKFLT", false, true, true, "stack fault");
+ ADD_LINUX_SIGNAL(17, "SIGCHLD", false, false, true, "child status has changed", "SIGCLD");
+ ADD_LINUX_SIGNAL(18, "SIGCONT", false, false, true, "process continue");
+ ADD_LINUX_SIGNAL(19, "SIGSTOP", true, true, true, "process stop");
+ ADD_LINUX_SIGNAL(20, "SIGTSTP", false, true, true, "tty stop");
+ ADD_LINUX_SIGNAL(21, "SIGTTIN", false, true, true, "background tty read");
+ ADD_LINUX_SIGNAL(22, "SIGTTOU", false, true, true, "background tty write");
+ ADD_LINUX_SIGNAL(23, "SIGURG", false, true, true, "urgent data on socket");
+ ADD_LINUX_SIGNAL(24, "SIGXCPU", false, true, true, "CPU resource exceeded");
+ ADD_LINUX_SIGNAL(25, "SIGXFSZ", false, true, true, "file size limit exceeded");
+ ADD_LINUX_SIGNAL(26, "SIGVTALRM", false, true, true, "virtual time alarm");
+ ADD_LINUX_SIGNAL(27, "SIGPROF", false, false, false, "profiling time alarm");
+ ADD_LINUX_SIGNAL(28, "SIGWINCH", false, true, true, "window size changes");
+ ADD_LINUX_SIGNAL(29, "SIGIO", false, true, true, "input/output ready/Pollable event", "SIGPOLL");
+ ADD_LINUX_SIGNAL(30, "SIGPWR", false, true, true, "power failure");
+ ADD_LINUX_SIGNAL(31, "SIGSYS", false, true, true, "invalid system call");
+ ADD_LINUX_SIGNAL(32, "SIG32", false, false, false, "threading library internal signal 1");
+ ADD_LINUX_SIGNAL(33, "SIG33", false, false, false, "threading library internal signal 2");
+ ADD_LINUX_SIGNAL(34, "SIGRTMIN", false, false, false, "real time signal 0");
+ ADD_LINUX_SIGNAL(35, "SIGRTMIN+1", false, false, false, "real time signal 1");
+ ADD_LINUX_SIGNAL(36, "SIGRTMIN+2", false, false, false, "real time signal 2");
+ ADD_LINUX_SIGNAL(37, "SIGRTMIN+3", false, false, false, "real time signal 3");
+ ADD_LINUX_SIGNAL(38, "SIGRTMIN+4", false, false, false, "real time signal 4");
+ ADD_LINUX_SIGNAL(39, "SIGRTMIN+5", false, false, false, "real time signal 5");
+ ADD_LINUX_SIGNAL(40, "SIGRTMIN+6", false, false, false, "real time signal 6");
+ ADD_LINUX_SIGNAL(41, "SIGRTMIN+7", false, false, false, "real time signal 7");
+ ADD_LINUX_SIGNAL(42, "SIGRTMIN+8", false, false, false, "real time signal 8");
+ ADD_LINUX_SIGNAL(43, "SIGRTMIN+9", false, false, false, "real time signal 9");
+ ADD_LINUX_SIGNAL(44, "SIGRTMIN+10", false, false, false, "real time signal 10");
+ ADD_LINUX_SIGNAL(45, "SIGRTMIN+11", false, false, false, "real time signal 11");
+ ADD_LINUX_SIGNAL(46, "SIGRTMIN+12", false, false, false, "real time signal 12");
+ ADD_LINUX_SIGNAL(47, "SIGRTMIN+13", false, false, false, "real time signal 13");
+ ADD_LINUX_SIGNAL(48, "SIGRTMIN+14", false, false, false, "real time signal 14");
+ ADD_LINUX_SIGNAL(49, "SIGRTMIN+15", false, false, false, "real time signal 15");
+ ADD_LINUX_SIGNAL(50, "SIGRTMAX-14", false, false, false, "real time signal 16"); // switching to SIGRTMAX-xxx to match "kill -l" output
+ ADD_LINUX_SIGNAL(51, "SIGRTMAX-13", false, false, false, "real time signal 17");
+ ADD_LINUX_SIGNAL(52, "SIGRTMAX-12", false, false, false, "real time signal 18");
+ ADD_LINUX_SIGNAL(53, "SIGRTMAX-11", false, false, false, "real time signal 19");
+ ADD_LINUX_SIGNAL(54, "SIGRTMAX-10", false, false, false, "real time signal 20");
+ ADD_LINUX_SIGNAL(55, "SIGRTMAX-9", false, false, false, "real time signal 21");
+ ADD_LINUX_SIGNAL(56, "SIGRTMAX-8", false, false, false, "real time signal 22");
+ ADD_LINUX_SIGNAL(57, "SIGRTMAX-7", false, false, false, "real time signal 23");
+ ADD_LINUX_SIGNAL(58, "SIGRTMAX-6", false, false, false, "real time signal 24");
+ ADD_LINUX_SIGNAL(59, "SIGRTMAX-5", false, false, false, "real time signal 25");
+ ADD_LINUX_SIGNAL(60, "SIGRTMAX-4", false, false, false, "real time signal 26");
+ ADD_LINUX_SIGNAL(61, "SIGRTMAX-3", false, false, false, "real time signal 27");
+ ADD_LINUX_SIGNAL(62, "SIGRTMAX-2", false, false, false, "real time signal 28");
+ ADD_LINUX_SIGNAL(63, "SIGRTMAX-1", false, false, false, "real time signal 29");
+ ADD_LINUX_SIGNAL(64, "SIGRTMAX", false, false, false, "real time signal 30");
// clang-format on
}
diff --git a/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp b/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
index 6635b15b669f1..6637f4679c075 100644
--- a/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
+++ b/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
@@ -232,7 +232,7 @@ Status ProcessElfCore::DoLoadCore() {
bool prstatus_signal_found = false;
// Check we found a signal in a SIGINFO note.
for (const auto &thread_data : m_thread_data) {
- if (thread_data.siginfo.si_signo != 0)
+ if (!thread_data.siginfo_bytes.empty() || thread_data.signo != 0)
siginfo_signal_found = true;
if (thread_data.prstatus_sig != 0)
prstatus_signal_found = true;
@@ -242,10 +242,10 @@ Status ProcessElfCore::DoLoadCore() {
// PRSTATUS note.
if (prstatus_signal_found) {
for (auto &thread_data : m_thread_data)
- thread_data.siginfo.si_signo = thread_data.prstatus_sig;
+ thread_data.signo = thread_data.prstatus_sig;
} else if (m_thread_data.size() > 0) {
// If all else fails force the first thread to be SIGSTOP
- m_thread_data.begin()->siginfo.si_signo =
+ m_thread_data.begin()->signo =
GetUnixSignals()->GetSignalNumberFromName("SIGSTOP");
}
}
@@ -506,7 +506,7 @@ static void ParseFreeBSDPrStatus(ThreadData &thread_data,
else
offset += 16;
- thread_data.siginfo.si_signo = data.GetU32(&offset); // pr_cursig
+ thread_data.signo = data.GetU32(&offset); // pr_cursig
thread_data.tid = data.GetU32(&offset); // pr_pid
if (lp64)
offset += 4;
@@ -589,7 +589,7 @@ static void ParseOpenBSDProcInfo(ThreadData &thread_data,
return;
offset += 4;
- thread_data.siginfo.si_signo = data.GetU32(&offset);
+ thread_data.signo = data.GetU32(&offset);
}
llvm::Expected<std::vector<CoreNote>>
@@ -827,7 +827,7 @@ llvm::Error ProcessElfCore::parseNetBSDNotes(llvm::ArrayRef<CoreNote> notes) {
// Signal targeted at the whole process.
if (siglwp == 0) {
for (auto &data : m_thread_data)
- data.siginfo.si_signo = signo;
+ data.signo = signo;
}
// Signal destined for a particular LWP.
else {
@@ -835,7 +835,7 @@ llvm::Error ProcessElfCore::parseNetBSDNotes(llvm::ArrayRef<CoreNote> notes) {
for (auto &data : m_thread_data) {
if (data.tid == siglwp) {
- data.siginfo.si_signo = signo;
+ data.signo = signo;
passed = true;
break;
}
@@ -938,12 +938,10 @@ llvm::Error ProcessElfCore::parseLinuxNotes(llvm::ArrayRef<CoreNote> notes) {
break;
}
case ELF::NT_SIGINFO: {
- const lldb_private::UnixSignals &unix_signals = *GetUnixSignals();
- ELFLinuxSigInfo siginfo;
- Status status = siginfo.Parse(note.data, arch, unix_signals);
+ Status status = ELFLinuxSigInfo::Parse(
+ note.data, arch, GetTarget().GetPlatform(), thread_data);
if (status.Fail())
return status.ToError();
- thread_data.siginfo = siginfo;
break;
}
case ELF::NT_FILE: {
diff --git a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
index e1c28e2edc20b..ee9a03eec5a9f 100644
--- a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
+++ b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
@@ -53,7 +53,7 @@ using namespace lldb_private;
ThreadElfCore::ThreadElfCore(Process &process, const ThreadData &td)
: Thread(process, td.tid), m_thread_name(td.name), m_thread_reg_ctx_sp(),
m_gpregset_data(td.gpregset), m_notes(td.notes),
- m_siginfo(std::move(td.siginfo)) {}
+ m_siginfo_bytes(std::move(td.siginfo_bytes)), m_signo(td.signo) {}
ThreadElfCore::~ThreadElfCore() { DestroyThread(); }
@@ -249,26 +249,34 @@ ThreadElfCore::CreateRegisterContextForFrame(StackFrame *frame) {
return reg_ctx_sp;
}
+llvm::Expected<std::unique_ptr<llvm::MemoryBuffer>>
+ThreadElfCore::GetSiginfo(size_t max_size) const {
+ if (m_siginfo_bytes.empty())
+ return llvm::createStringError(llvm::inconvertibleErrorCode(),
+ "no siginfo note");
+
+ return llvm::MemoryBuffer::getMemBufferCopy(m_siginfo_bytes,
+ "siginfo note bytes");
+}
+
bool ThreadElfCore::CalculateStopInfo() {
ProcessSP process_sp(GetProcess());
if (!process_sp)
return false;
- lldb::UnixSignalsSP unix_signals_sp(process_sp->GetUnixSignals());
- if (!unix_signals_sp)
- return false;
-
- const char *sig_description;
- std::string description = m_siginfo.GetDescription(*unix_signals_sp);
- if (description.empty())
- sig_description = nullptr;
- else
- sig_description = description.c_str();
-
- SetStopInfo(StopInfo::CreateStopReasonWithSignal(
- *this, m_siginfo.si_signo, sig_description, m_siginfo.si_code));
+ PlatformSP platform_sp = process_sp->GetTarget().GetPlatform();
+ if (platform_sp) {
+ lldb::StopInfoSP stopinfo_sp = platform_sp->GetStopInfoFromSiginfo(*this);
+ // The platform SP can optionally handle creating the stop info from the
+ // siginfo value however it's not guaraunteed to be implemented on every
+ // platform, so if we fall through this case, we create from just the signo.
+ if (stopinfo_sp) {
+ SetStopInfo(std::move(stopinfo_sp));
+ return true;
+ }
+ }
- SetStopInfo(m_stop_info_sp);
+ SetStopInfo(StopInfo::CreateStopReasonWithSignal(*this, m_signo));
return true;
}
@@ -550,82 +558,26 @@ ELFLinuxPrPsInfo::Populate(const lldb_private::ProcessInstanceInfo &info,
return prpsinfo;
}
-// Parse SIGINFO from NOTE entry
-ELFLinuxSigInfo::ELFLinuxSigInfo() { memset(this, 0, sizeof(ELFLinuxSigInfo)); }
-
-size_t ELFLinuxSigInfo::GetSize(const lldb_private::ArchSpec &arch) {
- if (arch.IsMIPS())
- return sizeof(ELFLinuxSigInfo);
- switch (arch.GetCore()) {
- case lldb_private::ArchSpec::eCore_x86_64_x86_64:
- return sizeof(ELFLinuxSigInfo);
- case lldb_private::ArchSpec::eCore_s390x_generic:
- case lldb_private::ArchSpec::eCore_x86_32_i386:
- case lldb_private::ArchSpec::eCore_x86_32_i486:
- return 12;
- default:
- return 0;
- }
-}
-
Status ELFLinuxSigInfo::Parse(const DataExtractor &data, const ArchSpec &arch,
- const lldb_private::UnixSignals &unix_signals) {
- Status error;
- uint64_t size = GetSize(arch);
- if (size > data.GetByteSize()) {
- error = Status::FromErrorStringWithFormat(
- "NT_SIGINFO size should be %zu, but the remaining bytes are: %" PRIu64,
- GetSize(arch), data.GetByteSize());
- return error;
- }
-
- // Set that we've parsed the siginfo from a SIGINFO note.
- note_type = eNT_SIGINFO;
- // Parsing from a 32 bit ELF core file, and populating/reusing the structure
- // properly, because the struct is for the 64 bit version
- offset_t offset = 0;
- si_signo = data.GetU32(&offset);
- si_errno = data.GetU32(&offset);
- si_code = data.GetU32(&offset);
- // 64b ELF have a 4 byte pad.
- if (data.GetAddressByteSize() == 8)
- offset += 4;
- // Not every stop signal has a valid address, but that will get resolved in
- // the unix_signals.GetSignalDescription() call below.
- if (unix_signals.GetShouldStop(si_signo)) {
- // Instead of memcpy we call all these individually as the extractor will
- // handle endianness for us.
- sigfault.si_addr = data.GetAddress(&offset);
- sigfault.si_addr_lsb = data.GetU16(&offset);
- if (data.GetByteSize() - offset >= sizeof(sigfault.bounds)) {
- sigfault.bounds._addr_bnd._lower = data.GetAddress(&offset);
- sigfault.bounds._addr_bnd._upper = data.GetAddress(&offset);
- sigfault.bounds._pkey = data.GetU32(&offset);
- } else {
- // Set these to 0 so we don't use bogus data for the description.
- sigfault.bounds._addr_bnd._lower = 0;
- sigfault.bounds._addr_bnd._upper = 0;
- sigfault.bounds._pkey = 0;
- }
- }
-
- return error;
-}
-
-std::string ELFLinuxSigInfo::GetDescription(
- const lldb_private::UnixSignals &unix_signals) const {
- if (unix_signals.GetShouldStop(si_signo) && note_type == eNT_SIGINFO) {
- if (sigfault.bounds._addr_bnd._upper != 0)
- return unix_signals.GetSignalDescription(
- si_signo, si_code, sigfault.si_addr, sigfault.bounds._addr_bnd._lower,
- sigfault.bounds._addr_bnd._upper);
- else
- return unix_signals.GetSignalDescription(si_signo, si_code,
- sigfault.si_addr);
- }
-
- // This looks weird, but there is an existing pattern where we don't pass a
- // description to keep up with that, we return empty here, and then the above
- // function will set the description whether or not this is empty.
- return std::string();
+ const lldb::PlatformSP platform_sp,
+ ThreadData &thread_data) {
+ if (!platform_sp)
+ return Status::FromErrorString("No platform for arch.");
+ CompilerType type = platform_sp->GetSiginfoType(arch.GetTriple());
+ if (!type.IsValid())
+ return Status::FromErrorString("no siginfo_t for platform.");
+
+ auto type_size_or_err = type.GetByteSize(nullptr);
+ if (!type_size_or_err)
+ return Status::FromError(type_size_or_err.takeError());
+
+ if (data.GetByteSize() < *type_size_or_err)
+ return Status::FromErrorString(
+ "siginfo note byte size smaller than siginfo_t for platform.");
+
+ lldb::offset_t offset = 0;
+ const char *bytes =
+ static_cast<const char *>(data.GetData(&offset, *type_size_or_err));
+ thread_data.siginfo_bytes = llvm::StringRef(bytes, *type_size_or_err);
+ return Status();
}
diff --git a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.h b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.h
index 6f8d41351a6bf..8a84ac718461f 100644
--- a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.h
+++ b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.h
@@ -10,8 +10,10 @@
#define LLDB_SOURCE_PLUGINS_PROCESS_ELF_CORE_THREADELFCORE_H
#include "Plugins/Process/elf-core/RegisterUtilities.h"
+#include "lldb/Target/Platform.h"
#include "lldb/Target/Thread.h"
#include "lldb/Utility/DataExtractor.h"
+#include "lldb/ValueObject/ValueObject.h"
#include "llvm/ADT/DenseMap.h"
#include <optional>
#include <string>
@@ -77,49 +79,23 @@ struct ELFLinuxPrStatus {
static_assert(sizeof(ELFLinuxPrStatus) == 112,
"sizeof ELFLinuxPrStatus is not correct!");
-struct ELFLinuxSigInfo {
-
- int32_t si_signo; // Order matters for the first 3.
- int32_t si_errno;
- int32_t si_code;
- // Copied from siginfo_t so we don't have to include signal.h on non 'Nix
- // builds. Slight modifications to ensure no 32b vs 64b differences.
- struct alignas(8) {
- lldb::addr_t si_addr; /* faulting insn/memory ref. */
- int16_t si_addr_lsb; /* Valid LSB of the reported address. */
- union {
- /* used when si_code=SEGV_BNDERR */
- struct {
- lldb::addr_t _lower;
- lldb::addr_t _upper;
- } _addr_bnd;
- /* used when si_code=SEGV_PKUERR */
- uint32_t _pkey;
- } bounds;
- } sigfault;
-
- enum SigInfoNoteType : uint8_t { eUnspecified, eNT_SIGINFO };
- SigInfoNoteType note_type;
-
- ELFLinuxSigInfo();
-
- lldb_private::Status Parse(const lldb_private::DataExtractor &data,
- const lldb_private::ArchSpec &arch,
- const lldb_private::UnixSignals &unix_signals);
-
- std::string
- GetDescription(const lldb_private::UnixSignals &unix_signals) const;
-
- // Return the bytesize of the structure
- // 64 bit - just sizeof
- // 32 bit - hardcoded because we are reusing the struct, but some of the
- // members are smaller -
- // so the layout is not the same
- static size_t GetSize(const lldb_private::ArchSpec &arch);
+struct ThreadData {
+ lldb_private::DataExtractor gpregset;
+ std::vector<lldb_private::CoreNote> notes;
+ lldb::tid_t tid;
+ std::string name;
+ llvm::StringRef siginfo_bytes;
+ int prstatus_sig = 0;
+ int signo = 0;
};
-static_assert(sizeof(ELFLinuxSigInfo) == 56,
- "sizeof ELFLinuxSigInfo is not correct!");
+class ELFLinuxSigInfo {
+public:
+ static lldb_private::Status Parse(const lldb_private::DataExtractor &data,
+ const lldb_private::ArchSpec &arch,
+ const lldb::PlatformSP platform_sp,
+ ThreadData &thread_data);
+};
// PRPSINFO structure's size differs based on architecture.
// This is the layout in the x86-64 arch case.
@@ -163,15 +139,6 @@ struct ELFLinuxPrPsInfo {
static_assert(sizeof(ELFLinuxPrPsInfo) == 136,
"sizeof ELFLinuxPrPsInfo is not correct!");
-struct ThreadData {
- lldb_private::DataExtractor gpregset;
- std::vector<lldb_private::CoreNote> notes;
- lldb::tid_t tid;
- std::string name;
- ELFLinuxSigInfo siginfo;
- int prstatus_sig = 0;
-};
-
class ThreadElfCore : public lldb_private::Thread {
public:
ThreadElfCore(lldb_private::Process &process, const ThreadData &td);
@@ -200,8 +167,8 @@ class ThreadElfCore : public lldb_private::Thread {
m_thread_name.clear();
}
- void CreateStopFromSigInfo(const ELFLinuxSigInfo &siginfo,
- const lldb_private::UnixSignals &unix_signals);
+ llvm::Expected<std::unique_ptr<llvm::MemoryBuffer>>
+ GetSiginfo(size_t max_size) const override;
protected:
// Member variables.
@@ -210,7 +177,9 @@ class ThreadElfCore : public lldb_private::Thread {
lldb_private::DataExtractor m_gpregset_data;
std::vector<lldb_private::CoreNote> m_notes;
- ELFLinuxSigInfo m_siginfo;
+ llvm::StringRef m_siginfo_bytes;
+ // Only used if no siginfo note.
+ int m_signo;
bool CalculateStopInfo() override;
};
diff --git a/lldb/source/Target/UnixSignals.cpp b/lldb/source/Target/UnixSignals.cpp
index da661003925c7..6113c6648817c 100644
--- a/lldb/source/Target/UnixSignals.cpp
+++ b/lldb/source/Target/UnixSignals.cpp
@@ -137,11 +137,11 @@ llvm::StringRef UnixSignals::GetSignalAsStringRef(int32_t signo) const {
return pos->second.m_name;
}
-std::string
-UnixSignals::GetSignalDescription(int32_t signo, std::optional<int32_t> code,
- std::optional<lldb::addr_t> addr,
- std::optional<lldb::addr_t> lower,
- std::optional<lldb::addr_t> upper) const {
+std::string UnixSignals::GetSignalDescription(
+ int32_t signo, std::optional<int32_t> code,
+ std::optional<lldb::addr_t> addr, std::optional<lldb::addr_t> lower,
+ std::optional<lldb::addr_t> upper, std::optional<uint32_t> pid,
+ std::optional<uint32_t> uid) const {
std::string str;
collection::const_iterator pos = m_signals.find(signo);
@@ -180,6 +180,10 @@ UnixSignals::GetSignalDescription(int32_t signo, std::optional<int32_t> code,
strm << sc.m_description.str();
break;
+ case SignalCodePrintOption::Sender:
+ if (pid && uid)
+ strm << " (sender pid=" << *pid << ", uid=" << *uid << ")";
+ break;
}
str += strm.str();
}
@@ -397,4 +401,3 @@ bool UnixSignals::ResetSignal(int32_t signo, bool reset_stop,
(*elem).second.Reset(reset_stop, reset_notify, reset_suppress);
return true;
}
-
diff --git a/lldb/unittests/Signals/UnixSignalsTest.cpp b/lldb/unittests/Signals/UnixSignalsTest.cpp
index 9a7d9afc2b185..582e441556067 100644
--- a/lldb/unittests/Signals/UnixSignalsTest.cpp
+++ b/lldb/unittests/Signals/UnixSignalsTest.cpp
@@ -27,6 +27,8 @@ class TestSignals : public UnixSignals {
AddSignalCode(16, 2, "SIG16 with a fault address",
SignalCodePrintOption::Address);
AddSignalCode(16, 3, "bounds violation", SignalCodePrintOption::Bounds);
+ AddSignalCode(16, -6, "sent by tkill system call",
+ SignalCodePrintOption::Sender);
}
};
@@ -124,6 +126,13 @@ TEST(UnixSignalsTest, GetAsString) {
// No address given just print the code description.
ASSERT_EQ("SIG16: SIG16 with a fault address",
signals.GetSignalDescription(16, 2));
+ // TKill, but with no sender
+ ASSERT_EQ("SIG16: sent by tkill system call",
+ signals.GetSignalDescription(16, -6, 0xCAFEF00D));
+ // TKill, but with no sender
+ ASSERT_EQ("SIG16: sent by tkill system call (sender pid=912, uid=99)",
+ signals.GetSignalDescription(16, -6, 0xCAFEF00D, std::nullopt,
+ std::nullopt, 912, 99));
const char *expected = "SIG16: bounds violation";
// Must pass all needed info to get full output.
>From 7fcf30ee4b18831e8972adea73ce8c4def8f21db Mon Sep 17 00:00:00 2001
From: Jacob Lalonde <jalalonde at fb.com>
Date: Tue, 27 May 2025 13:41:32 -0700
Subject: [PATCH 2/5] Have the target platform get updated to the core's
platform, and do it before we parse the notes
---
.../Process/elf-core/ProcessElfCore.cpp | 22 +++++++++----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp b/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
index 6637f4679c075..e1050b6f732b3 100644
--- a/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
+++ b/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
@@ -176,6 +176,17 @@ Status ProcessElfCore::DoLoadCore() {
return error;
}
+ // Even if the architecture is set in the target, we need to override it to
+ // match the core file which is always single arch.
+ ArchSpec arch(m_core_module_sp->GetArchitecture());
+
+ ArchSpec target_arch = GetTarget().GetArchitecture();
+ ArchSpec core_arch(m_core_module_sp->GetArchitecture());
+ target_arch.MergeFrom(core_arch);
+ GetTarget().SetArchitecture(target_arch, /*set_platform*/ true);
+
+ SetUnixSignals(UnixSignals::Create(GetArchitecture()));
+
SetCanJIT(false);
m_thread_data_valid = true;
@@ -216,17 +227,6 @@ Status ProcessElfCore::DoLoadCore() {
m_core_tag_ranges.Sort();
}
- // Even if the architecture is set in the target, we need to override it to
- // match the core file which is always single arch.
- ArchSpec arch(m_core_module_sp->GetArchitecture());
-
- ArchSpec target_arch = GetTarget().GetArchitecture();
- ArchSpec core_arch(m_core_module_sp->GetArchitecture());
- target_arch.MergeFrom(core_arch);
- GetTarget().SetArchitecture(target_arch);
-
- SetUnixSignals(UnixSignals::Create(GetArchitecture()));
-
// Ensure we found at least one thread that was stopped on a signal.
bool siginfo_signal_found = false;
bool prstatus_signal_found = false;
>From b6fa2d270e0352798a8150be52e496fe7386e2a5 Mon Sep 17 00:00:00 2001
From: Jacob Lalonde <jalalonde at fb.com>
Date: Tue, 27 May 2025 18:15:44 -0700
Subject: [PATCH 3/5] Support cases where there is no platform and the host
platform doesn't support siginfo
---
.../source/Plugins/Process/elf-core/ThreadElfCore.cpp | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
index ee9a03eec5a9f..5930cd1b9d448 100644
--- a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
+++ b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
@@ -561,11 +561,18 @@ ELFLinuxPrPsInfo::Populate(const lldb_private::ProcessInstanceInfo &info,
Status ELFLinuxSigInfo::Parse(const DataExtractor &data, const ArchSpec &arch,
const lldb::PlatformSP platform_sp,
ThreadData &thread_data) {
+ Log *log = GetLog(LLDBLog::Thread);
if (!platform_sp)
return Status::FromErrorString("No platform for arch.");
CompilerType type = platform_sp->GetSiginfoType(arch.GetTriple());
- if (!type.IsValid())
- return Status::FromErrorString("no siginfo_t for platform.");
+ if (!type.IsValid()) {
+ // While not having a platform would be an error, it's not necessarily
+ // guaraunteed it will support siginfo, and instead of returning an error
+ // here and failing to load the entire core we can give up and fallback on
+ // other information.
+ LLDB_LOG(log, "Platform does not support GetSiginfoType");
+ return Status();
+ }
auto type_size_or_err = type.GetByteSize(nullptr);
if (!type_size_or_err)
>From 5d96fd09a37da7cbb51befe0ccb9dff5aa27c09c Mon Sep 17 00:00:00 2001
From: Jacob Lalonde <jalalonde at fb.com>
Date: Wed, 28 May 2025 09:18:46 -0700
Subject: [PATCH 4/5] Remove unncessary checks in parse method and instead make
the data extractor a string ref directly
---
.../Process/elf-core/ProcessElfCore.cpp | 9 +++---
.../Process/elf-core/ThreadElfCore.cpp | 31 -------------------
2 files changed, 5 insertions(+), 35 deletions(-)
diff --git a/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp b/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
index e1050b6f732b3..88eeddf178788 100644
--- a/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
+++ b/lldb/source/Plugins/Process/elf-core/ProcessElfCore.cpp
@@ -938,10 +938,11 @@ llvm::Error ProcessElfCore::parseLinuxNotes(llvm::ArrayRef<CoreNote> notes) {
break;
}
case ELF::NT_SIGINFO: {
- Status status = ELFLinuxSigInfo::Parse(
- note.data, arch, GetTarget().GetPlatform(), thread_data);
- if (status.Fail())
- return status.ToError();
+ lldb::offset_t size = note.data.GetByteSize();
+ lldb::offset_t offset = 0;
+ const char *bytes =
+ static_cast<const char *>(note.data.GetData(&offset, size));
+ thread_data.siginfo_bytes = llvm::StringRef(bytes, size);
break;
}
case ELF::NT_FILE: {
diff --git a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
index 5930cd1b9d448..7015c3c65cc7d 100644
--- a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
+++ b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
@@ -557,34 +557,3 @@ ELFLinuxPrPsInfo::Populate(const lldb_private::ProcessInstanceInfo &info,
*(psargs - 1) = '\0';
return prpsinfo;
}
-
-Status ELFLinuxSigInfo::Parse(const DataExtractor &data, const ArchSpec &arch,
- const lldb::PlatformSP platform_sp,
- ThreadData &thread_data) {
- Log *log = GetLog(LLDBLog::Thread);
- if (!platform_sp)
- return Status::FromErrorString("No platform for arch.");
- CompilerType type = platform_sp->GetSiginfoType(arch.GetTriple());
- if (!type.IsValid()) {
- // While not having a platform would be an error, it's not necessarily
- // guaraunteed it will support siginfo, and instead of returning an error
- // here and failing to load the entire core we can give up and fallback on
- // other information.
- LLDB_LOG(log, "Platform does not support GetSiginfoType");
- return Status();
- }
-
- auto type_size_or_err = type.GetByteSize(nullptr);
- if (!type_size_or_err)
- return Status::FromError(type_size_or_err.takeError());
-
- if (data.GetByteSize() < *type_size_or_err)
- return Status::FromErrorString(
- "siginfo note byte size smaller than siginfo_t for platform.");
-
- lldb::offset_t offset = 0;
- const char *bytes =
- static_cast<const char *>(data.GetData(&offset, *type_size_or_err));
- thread_data.siginfo_bytes = llvm::StringRef(bytes, *type_size_or_err);
- return Status();
-}
>From c083af6c1598ed1a55cf95e36f1dbef0a25ecaf2 Mon Sep 17 00:00:00 2001
From: Jacob Lalonde <jalalonde at fb.com>
Date: Wed, 28 May 2025 09:25:52 -0700
Subject: [PATCH 5/5] Add ifndefs for all the new negative SI_CODES to ensure
we can build on any linux
---
.../Plugins/Process/Utility/LinuxSignals.cpp | 24 +++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/lldb/source/Plugins/Process/Utility/LinuxSignals.cpp b/lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
index 76c32e376eb4b..15a77ce227ec5 100644
--- a/lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
+++ b/lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
@@ -27,6 +27,30 @@
#ifndef SEGV_CPERR
#define SEGV_CPERR 10
#endif
+#ifndef SI_QUEUE
+#define SI_QUEUE -1
+#endif
+#ifndef SI_TIMER
+#define SI_TIMER -2
+#endif
+#ifndef SI_MESGQ
+#define SI_MESGQ -3
+#endif
+#ifndef SI_ASYNCIO
+#define SI_ASYNCIO -4
+#endif
+#ifndef SI_SIGIO
+#define SI_SIGIO -5
+#endif
+#ifndef SI_TKILL
+#define SI_TKILL -6
+#endif
+#ifndef SI_DETHREAD
+#define SI_DETHREAD -7
+#endif
+#ifndef SI_ASYNCNL
+#define SI_ASYNCNL -60
+#endif
#define ADD_SIGCODE(signal_name, signal_value, code_name, code_value, ...) \
static_assert(signal_name == signal_value, \
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