ab745c2ad8
The OperatingSystem plug-ins allow code to detect threads in memory and then say "memory thread 0x11111" is backed by the actual thread 1. You can then single step these virtual threads. A problem arose when thread specific breakpoints were used during thread plans where we would say "set a breakpoint on thread 0x11111" and we would hit the breakpoint on the real thread 1 and the thread IDs wouldn't match and we would get rid of the "stopped at breakpoint" stop info due to this mismatch. Code was added to ensure these events get forwarded and thus allow single stepping a memory thread to work correctly. Added a test case for this as well. <rdar://problem/19211770> llvm-svn: 234364
530 lines
20 KiB
C++
530 lines
20 KiB
C++
//===-- StopInfoMachException.cpp -------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "StopInfoMachException.h"
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// C Includes
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// C++ Includes
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// Other libraries and framework includes
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// Project includes
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#include "lldb/Breakpoint/Watchpoint.h"
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#include "lldb/Core/ArchSpec.h"
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#include "lldb/Core/StreamString.h"
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#include "lldb/Symbol/Symbol.h"
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#include "lldb/Target/DynamicLoader.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Target/ThreadPlan.h"
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#include "lldb/Target/UnixSignals.h"
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using namespace lldb;
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using namespace lldb_private;
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const char *
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StopInfoMachException::GetDescription ()
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{
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if (m_description.empty() && m_value != 0)
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{
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ExecutionContext exe_ctx (m_thread_wp.lock());
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Target *target = exe_ctx.GetTargetPtr();
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const llvm::Triple::ArchType cpu = target ? target->GetArchitecture().GetMachine() : llvm::Triple::UnknownArch;
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const char *exc_desc = NULL;
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const char *code_label = "code";
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const char *code_desc = NULL;
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const char *subcode_label = "subcode";
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const char *subcode_desc = NULL;
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switch (m_value)
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{
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case 1: // EXC_BAD_ACCESS
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exc_desc = "EXC_BAD_ACCESS";
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subcode_label = "address";
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switch (cpu)
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{
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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switch (m_exc_code)
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{
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case 0xd: code_desc = "EXC_I386_GPFLT"; m_exc_data_count = 1; break;
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}
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break;
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case llvm::Triple::arm:
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switch (m_exc_code)
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{
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case 0x101: code_desc = "EXC_ARM_DA_ALIGN"; break;
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case 0x102: code_desc = "EXC_ARM_DA_DEBUG"; break;
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}
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (m_exc_code)
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{
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case 0x101: code_desc = "EXC_PPC_VM_PROT_READ"; break;
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case 0x102: code_desc = "EXC_PPC_BADSPACE"; break;
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case 0x103: code_desc = "EXC_PPC_UNALIGNED"; break;
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}
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break;
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default:
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break;
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}
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break;
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case 2: // EXC_BAD_INSTRUCTION
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exc_desc = "EXC_BAD_INSTRUCTION";
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switch (cpu)
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{
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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if (m_exc_code == 1)
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code_desc = "EXC_I386_INVOP";
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (m_exc_code)
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{
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case 1: code_desc = "EXC_PPC_INVALID_SYSCALL"; break;
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case 2: code_desc = "EXC_PPC_UNIPL_INST"; break;
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case 3: code_desc = "EXC_PPC_PRIVINST"; break;
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case 4: code_desc = "EXC_PPC_PRIVREG"; break;
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case 5: code_desc = "EXC_PPC_TRACE"; break;
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case 6: code_desc = "EXC_PPC_PERFMON"; break;
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}
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break;
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case llvm::Triple::arm:
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if (m_exc_code == 1)
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code_desc = "EXC_ARM_UNDEFINED";
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break;
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default:
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break;
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}
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break;
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case 3: // EXC_ARITHMETIC
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exc_desc = "EXC_ARITHMETIC";
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switch (cpu)
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{
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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switch (m_exc_code)
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{
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case 1: code_desc = "EXC_I386_DIV"; break;
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case 2: code_desc = "EXC_I386_INTO"; break;
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case 3: code_desc = "EXC_I386_NOEXT"; break;
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case 4: code_desc = "EXC_I386_EXTOVR"; break;
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case 5: code_desc = "EXC_I386_EXTERR"; break;
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case 6: code_desc = "EXC_I386_EMERR"; break;
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case 7: code_desc = "EXC_I386_BOUND"; break;
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case 8: code_desc = "EXC_I386_SSEEXTERR"; break;
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}
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (m_exc_code)
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{
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case 1: code_desc = "EXC_PPC_OVERFLOW"; break;
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case 2: code_desc = "EXC_PPC_ZERO_DIVIDE"; break;
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case 3: code_desc = "EXC_PPC_FLT_INEXACT"; break;
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case 4: code_desc = "EXC_PPC_FLT_ZERO_DIVIDE"; break;
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case 5: code_desc = "EXC_PPC_FLT_UNDERFLOW"; break;
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case 6: code_desc = "EXC_PPC_FLT_OVERFLOW"; break;
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case 7: code_desc = "EXC_PPC_FLT_NOT_A_NUMBER"; break;
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}
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break;
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default:
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break;
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}
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break;
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case 4: // EXC_EMULATION
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exc_desc = "EXC_EMULATION";
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break;
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case 5: // EXC_SOFTWARE
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exc_desc = "EXC_SOFTWARE";
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if (m_exc_code == 0x10003)
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{
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subcode_desc = "EXC_SOFT_SIGNAL";
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subcode_label = "signo";
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}
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break;
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case 6: // EXC_BREAKPOINT
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{
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exc_desc = "EXC_BREAKPOINT";
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switch (cpu)
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{
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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switch (m_exc_code)
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{
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case 1: code_desc = "EXC_I386_SGL"; break;
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case 2: code_desc = "EXC_I386_BPT"; break;
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}
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (m_exc_code)
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{
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case 1: code_desc = "EXC_PPC_BREAKPOINT"; break;
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}
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break;
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case llvm::Triple::arm:
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switch (m_exc_code)
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{
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case 0x101: code_desc = "EXC_ARM_DA_ALIGN"; break;
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case 0x102: code_desc = "EXC_ARM_DA_DEBUG"; break;
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case 1: code_desc = "EXC_ARM_BREAKPOINT"; break;
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// FIXME temporary workaround, exc_code 0 does not really mean EXC_ARM_BREAKPOINT
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case 0: code_desc = "EXC_ARM_BREAKPOINT"; break;
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}
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break;
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default:
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break;
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}
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}
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break;
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case 7:
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exc_desc = "EXC_SYSCALL";
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break;
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case 8:
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exc_desc = "EXC_MACH_SYSCALL";
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break;
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case 9:
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exc_desc = "EXC_RPC_ALERT";
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break;
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case 10:
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exc_desc = "EXC_CRASH";
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break;
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case 11:
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exc_desc = "EXC_RESOURCE";
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break;
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case 12:
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exc_desc = "EXC_GUARD";
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break;
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}
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StreamString strm;
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if (exc_desc)
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strm.PutCString(exc_desc);
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else
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strm.Printf("EXC_??? (%" PRIu64 ")", m_value);
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if (m_exc_data_count >= 1)
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{
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if (code_desc)
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strm.Printf(" (%s=%s", code_label, code_desc);
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else
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strm.Printf(" (%s=%" PRIu64, code_label, m_exc_code);
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}
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if (m_exc_data_count >= 2)
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{
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if (subcode_desc)
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strm.Printf(", %s=%s", subcode_label, subcode_desc);
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else
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strm.Printf(", %s=0x%" PRIx64, subcode_label, m_exc_subcode);
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}
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if (m_exc_data_count > 0)
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strm.PutChar(')');
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m_description.swap (strm.GetString());
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}
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return m_description.c_str();
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}
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StopInfoSP
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StopInfoMachException::CreateStopReasonWithMachException
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(
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Thread &thread,
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uint32_t exc_type,
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uint32_t exc_data_count,
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uint64_t exc_code,
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uint64_t exc_sub_code,
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uint64_t exc_sub_sub_code,
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bool pc_already_adjusted,
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bool adjust_pc_if_needed
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)
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{
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if (exc_type != 0)
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{
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uint32_t pc_decrement = 0;
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ExecutionContext exe_ctx (thread.shared_from_this());
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Target *target = exe_ctx.GetTargetPtr();
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const llvm::Triple::ArchType cpu = target ? target->GetArchitecture().GetMachine() : llvm::Triple::UnknownArch;
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switch (exc_type)
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{
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case 1: // EXC_BAD_ACCESS
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break;
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case 2: // EXC_BAD_INSTRUCTION
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switch (cpu)
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{
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (exc_code)
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{
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case 1: // EXC_PPC_INVALID_SYSCALL
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case 2: // EXC_PPC_UNIPL_INST
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case 3: // EXC_PPC_PRIVINST
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case 4: // EXC_PPC_PRIVREG
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break;
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case 5: // EXC_PPC_TRACE
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return StopInfo::CreateStopReasonToTrace (thread);
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case 6: // EXC_PPC_PERFMON
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break;
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}
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break;
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default:
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break;
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}
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break;
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case 3: // EXC_ARITHMETIC
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case 4: // EXC_EMULATION
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break;
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case 5: // EXC_SOFTWARE
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if (exc_code == 0x10003) // EXC_SOFT_SIGNAL
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{
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if (exc_sub_code == 5)
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{
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// On MacOSX, a SIGTRAP can signify that a process has called
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// exec, so we should check with our dynamic loader to verify.
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ProcessSP process_sp (thread.GetProcess());
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if (process_sp)
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{
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DynamicLoader *dynamic_loader = process_sp->GetDynamicLoader();
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if (dynamic_loader && dynamic_loader->ProcessDidExec())
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{
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// The program was re-exec'ed
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return StopInfo::CreateStopReasonWithExec (thread);
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}
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// if (!process_did_exec)
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// {
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// // We have a SIGTRAP, make sure we didn't exec by checking
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// // for the PC being at "_dyld_start"...
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// lldb::StackFrameSP frame_sp (thread.GetStackFrameAtIndex(0));
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// if (frame_sp)
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// {
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// const Symbol *symbol = frame_sp->GetSymbolContext(eSymbolContextSymbol).symbol;
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// if (symbol)
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// {
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// if (symbol->GetName() == ConstString("_dyld_start"))
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// process_did_exec = true;
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// }
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// }
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// }
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}
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}
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return StopInfo::CreateStopReasonWithSignal (thread, exc_sub_code);
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}
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break;
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case 6: // EXC_BREAKPOINT
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{
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bool is_actual_breakpoint = false;
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bool is_trace_if_actual_breakpoint_missing = false;
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switch (cpu)
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{
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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if (exc_code == 1) // EXC_I386_SGL
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{
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if (!exc_sub_code)
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{
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// This looks like a plain trap.
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// Have to check if there is a breakpoint here as well. When you single-step onto a trap,
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// the single step stops you not to trap. Since we also do that check below, let's just use
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// that logic.
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is_actual_breakpoint = true;
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is_trace_if_actual_breakpoint_missing = true;
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}
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else
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{
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// It's a watchpoint, then.
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// The exc_sub_code indicates the data break address.
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lldb::WatchpointSP wp_sp;
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if (target)
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wp_sp = target->GetWatchpointList().FindByAddress((lldb::addr_t)exc_sub_code);
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if (wp_sp && wp_sp->IsEnabled())
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{
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// Debugserver may piggyback the hardware index of the fired watchpoint in the exception data.
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// Set the hardware index if that's the case.
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if (exc_data_count >=3)
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wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code);
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return StopInfo::CreateStopReasonWithWatchpointID(thread, wp_sp->GetID());
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}
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}
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}
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else if (exc_code == 2 || // EXC_I386_BPT
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exc_code == 3) // EXC_I386_BPTFLT
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{
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// KDP returns EXC_I386_BPTFLT for trace breakpoints
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if (exc_code == 3)
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is_trace_if_actual_breakpoint_missing = true;
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is_actual_breakpoint = true;
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if (!pc_already_adjusted)
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pc_decrement = 1;
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}
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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is_actual_breakpoint = exc_code == 1; // EXC_PPC_BREAKPOINT
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break;
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case llvm::Triple::arm:
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if (exc_code == 0x102) // EXC_ARM_DA_DEBUG
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{
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// It's a watchpoint, then, if the exc_sub_code indicates a known/enabled
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// data break address from our watchpoint list.
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lldb::WatchpointSP wp_sp;
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if (target)
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wp_sp = target->GetWatchpointList().FindByAddress((lldb::addr_t)exc_sub_code);
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if (wp_sp && wp_sp->IsEnabled())
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{
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// Debugserver may piggyback the hardware index of the fired watchpoint in the exception data.
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// Set the hardware index if that's the case.
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if (exc_data_count >=3)
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wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code);
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return StopInfo::CreateStopReasonWithWatchpointID(thread, wp_sp->GetID());
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}
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else
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{
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is_actual_breakpoint = true;
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is_trace_if_actual_breakpoint_missing = true;
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}
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}
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else if (exc_code == 1) // EXC_ARM_BREAKPOINT
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{
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is_actual_breakpoint = true;
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is_trace_if_actual_breakpoint_missing = true;
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}
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else if (exc_code == 0) // FIXME not EXC_ARM_BREAKPOINT but a kernel is currently returning this so accept it as indicating a breakpoint until the kernel is fixed
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{
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is_actual_breakpoint = true;
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is_trace_if_actual_breakpoint_missing = true;
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}
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break;
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case llvm::Triple::aarch64:
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{
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if (exc_code == 1 && exc_sub_code == 0) // EXC_ARM_BREAKPOINT
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{
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// This is hit when we single instruction step aka MDSCR_EL1 SS bit 0 is set
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return StopInfo::CreateStopReasonToTrace(thread);
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}
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if (exc_code == 0x102) // EXC_ARM_DA_DEBUG
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{
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// It's a watchpoint, then, if the exc_sub_code indicates a known/enabled
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// data break address from our watchpoint list.
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lldb::WatchpointSP wp_sp;
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if (target)
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wp_sp = target->GetWatchpointList().FindByAddress((lldb::addr_t)exc_sub_code);
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if (wp_sp && wp_sp->IsEnabled())
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{
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// Debugserver may piggyback the hardware index of the fired watchpoint in the exception data.
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// Set the hardware index if that's the case.
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if (exc_data_count >= 3)
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wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code);
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return StopInfo::CreateStopReasonWithWatchpointID(thread, wp_sp->GetID());
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}
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// EXC_ARM_DA_DEBUG seems to be reused for EXC_BREAKPOINT as well as EXC_BAD_ACCESS
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if (thread.GetTemporaryResumeState() == eStateStepping)
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return StopInfo::CreateStopReasonToTrace(thread);
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}
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// It looks like exc_sub_code has the 4 bytes of the instruction that triggered the
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// exception, i.e. our breakpoint opcode
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is_actual_breakpoint = exc_code == 1;
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break;
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}
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default:
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break;
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}
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if (is_actual_breakpoint)
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{
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RegisterContextSP reg_ctx_sp (thread.GetRegisterContext());
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addr_t pc = reg_ctx_sp->GetPC() - pc_decrement;
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ProcessSP process_sp (thread.CalculateProcess());
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lldb::BreakpointSiteSP bp_site_sp;
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if (process_sp)
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bp_site_sp = process_sp->GetBreakpointSiteList().FindByAddress(pc);
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if (bp_site_sp && bp_site_sp->IsEnabled())
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{
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// Update the PC if we were asked to do so, but only do
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// so if we find a breakpoint that we know about cause
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// this could be a trap instruction in the code
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if (pc_decrement > 0 && adjust_pc_if_needed)
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reg_ctx_sp->SetPC (pc);
|
|
|
|
// If the breakpoint is for this thread, then we'll report the hit, but if it is for another thread,
|
|
// we can just report no reason. We don't need to worry about stepping over the breakpoint here, that
|
|
// will be taken care of when the thread resumes and notices that there's a breakpoint under the pc.
|
|
// If we have an operating system plug-in, we might have set a thread specific breakpoint using the
|
|
// operating system thread ID, so we can't make any assumptions about the thread ID so we must always
|
|
// report the breakpoint regardless of the thread.
|
|
if (bp_site_sp->ValidForThisThread (&thread) || thread.GetProcess()->GetOperatingSystem () != NULL)
|
|
return StopInfo::CreateStopReasonWithBreakpointSiteID (thread, bp_site_sp->GetID());
|
|
else
|
|
return StopInfoSP();
|
|
}
|
|
|
|
// Don't call this a trace if we weren't single stepping this thread.
|
|
if (is_trace_if_actual_breakpoint_missing && thread.GetTemporaryResumeState() == eStateStepping)
|
|
{
|
|
return StopInfo::CreateStopReasonToTrace (thread);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 7: // EXC_SYSCALL
|
|
case 8: // EXC_MACH_SYSCALL
|
|
case 9: // EXC_RPC_ALERT
|
|
case 10: // EXC_CRASH
|
|
break;
|
|
}
|
|
|
|
return StopInfoSP(new StopInfoMachException (thread, exc_type, exc_data_count, exc_code, exc_sub_code));
|
|
}
|
|
return StopInfoSP();
|
|
}
|