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clang-p2996/lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
David Spickett 5658bc4ae7 [lldb][Linux] Add Control Protection Fault signal (#122917) 
This will be sent by Arm's Guarded Control Stack extension when an
invalid return is executed.

The signal does have an address we could show, but it's the PC at which
the fault occured. The debugger has plenty of ways to show you that
already, so I've left it out.

```
(lldb) c
Process 460 resuming
Process 460 stopped
* thread #1, name = 'test', stop reason = signal SIGSEGV: control protection fault
    frame #0: 0x0000000000400784 test`main at main.c:57:1
   54  	  afunc();
   55  	  printf("return from main\n");
   56  	  return 0;
-> 57  	}
(lldb) dis
<...>
->  0x400784 <+100>: ret
```

The new test case generates the signal by corrupting the link register
then attempting to return. This will work whether we manually enable GCS
or the C library does it for us.

(in the former case you could just return from main and it would fault)
2025-01-21 09:24:41 +00:00

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//===-- LinuxSignals.cpp --------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "LinuxSignals.h"
#ifdef __linux__
#include <csignal>
#ifndef SEGV_BNDERR
#define SEGV_BNDERR 3
#endif
#ifndef SEGV_MTEAERR
#define SEGV_MTEAERR 8
#endif
#ifndef SEGV_MTESERR
#define SEGV_MTESERR 9
#endif
#ifndef SEGV_CPERR
#define SEGV_CPERR 10
#endif
#define ADD_SIGCODE(signal_name, signal_value, code_name, code_value, ...) \
static_assert(signal_name == signal_value, \
"Value mismatch for signal number " #signal_name); \
static_assert(code_name == code_value, \
"Value mismatch for signal code " #code_name); \
AddSignalCode(signal_value, code_value, __VA_ARGS__)
#else
#define ADD_SIGCODE(signal_name, signal_value, code_name, code_value, ...) \
AddSignalCode(signal_value, code_value, __VA_ARGS__)
#endif /* ifdef __linux__ */
using namespace lldb_private;
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");
AddSignal(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");
ADD_SIGCODE(SIGILL, 4, ILL_ILLTRP, 4, "illegal trap");
ADD_SIGCODE(SIGILL, 4, ILL_PRVOPC, 5, "privileged opcode");
ADD_SIGCODE(SIGILL, 4, ILL_PRVREG, 6, "privileged register");
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");
AddSignal(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_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");
ADD_SIGCODE(SIGFPE, 8, FPE_FLTOVF, 4, "floating point overflow");
ADD_SIGCODE(SIGFPE, 8, FPE_FLTUND, 5, "floating point underflow");
ADD_SIGCODE(SIGFPE, 8, FPE_FLTRES, 6, "floating point inexact result");
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");
AddSignal(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);
ADD_SIGCODE(SIGSEGV, 11, SEGV_MTEAERR, 8, "async tag check fault");
ADD_SIGCODE(SIGSEGV, 11, SEGV_MTESERR, 9, "sync tag check fault", SignalCodePrintOption::Address);
ADD_SIGCODE(SIGSEGV, 11, SEGV_CPERR, 10, "control protection fault");
// Some platforms will occasionally send nonstandard spurious SI_KERNEL
// 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");
// clang-format on
}
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