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Log registers and fault instruction in Unix crashlog.

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This commit is contained in:
Jonathan G Rennison
2016-06-12 19:34:06 +01:00
parent 0951cb320c
commit 8d078acb4e
4 changed files with 152 additions and 14 deletions
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137
src/os/unix/crashlog_unix.cpp
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@@ -55,6 +55,8 @@
#include <unistd.h>
#endif
#include <vector>
#include "../../safeguards.h"
#if defined(__GLIBC__) && defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
@@ -80,6 +82,9 @@ class CrashLogUnix : public CrashLog {
int signum;
#ifdef WITH_SIGACTION
siginfo_t *si;
void *context;
bool signal_instruction_ptr_valid;
void *signal_instruction_ptr;
#endif
/* virtual */ char *LogOSVersion(char *buffer, const char *last) const
@@ -116,8 +121,13 @@ class CrashLogUnix : public CrashLog {
this->si->si_code);
if (this->signum != SIGABRT) {
buffer += seprintf(buffer, last,
" fault address: %p\n",
" Fault address: %p\n",
this->si->si_addr);
if (this->signal_instruction_ptr_valid) {
buffer += seprintf(buffer, last,
" Instruction address: %p\n",
this->signal_instruction_ptr);
}
}
}
#endif
@@ -163,7 +173,69 @@ class CrashLogUnix : public CrashLog {
#endif
/**
* Get a stack backtrace of the current thread's stack using the gdb debugger, if available.
* Show registers if possible
*
* Also log GDB information if available
*/
/* virtual */ char *LogRegisters(char *buffer, const char *last) const
{
buffer = LogGdbInfo(buffer, last);
#ifdef WITH_UCONTEXT
ucontext_t *ucontext = static_cast<ucontext_t *>(context);
#if defined(__x86_64__)
const gregset_t &gregs = ucontext->uc_mcontext.gregs;
buffer += seprintf(buffer, last,
"Registers:\n"
" rax: %#16llx rbx: %#16llx rcx: %#16llx rdx: %#16llx\n"
" rsi: %#16llx rdi: %#16llx rbp: %#16llx rsp: %#16llx\n"
" r8: %#16llx r9: %#16llx r10: %#16llx r11: %#16llx\n"
" r12: %#16llx r13: %#16llx r14: %#16llx r15: %#16llx\n"
" rip: %#16llx eflags: %#8llx\n\n",
gregs[REG_RAX],
gregs[REG_RBX],
gregs[REG_RCX],
gregs[REG_RDX],
gregs[REG_RSI],
gregs[REG_RDI],
gregs[REG_RBP],
gregs[REG_RSP],
gregs[REG_R8],
gregs[REG_R9],
gregs[REG_R10],
gregs[REG_R11],
gregs[REG_R12],
gregs[REG_R13],
gregs[REG_R14],
gregs[REG_R15],
gregs[REG_RIP],
gregs[REG_EFL]
);
#elif defined(__i386)
const gregset_t &gregs = ucontext->uc_mcontext.gregs;
buffer += seprintf(buffer, last,
"Registers:\n"
" eax: %#8x ebx: %#8x ecx: %#8x edx: %#8x\n"
" esi: %#8x edi: %#8x ebp: %#8x esp: %#8x\n"
" eip: %#8x eflags: %#8x\n\n",
gregs[REG_EAX],
gregs[REG_EBX],
gregs[REG_ECX],
gregs[REG_EDX],
gregs[REG_ESI],
gregs[REG_EDI],
gregs[REG_EBP],
gregs[REG_ESP],
gregs[REG_EIP],
gregs[REG_EFL]
);
#endif
#endif
return buffer;
}
/**
* Get a stack backtrace of the current thread's stack and other info using the gdb debugger, if available.
*
* Using GDB is useful as it knows about inlined functions and locals, and generally can
* do a more thorough job than in LogStacktrace.
@@ -171,7 +243,7 @@ class CrashLogUnix : public CrashLog {
* and there is some potentially useful information in the output from LogStacktrace
* which is not in gdb's output.
*/
char *LogStacktraceGdb(char *buffer, const char *last) const
char *LogGdbInfo(char *buffer, const char *last) const
{
#if defined(WITH_DBG_GDB)
@@ -198,9 +270,38 @@ class CrashLogUnix : public CrashLog {
dup2(null_fd, STDERR_FILENO);
dup2(null_fd, STDIN_FILENO);
}
char buffer[16];
seprintf(buffer, lastof(buffer), "%d", tid);
execlp("gdb", "gdb", "-n", "-p", buffer, "-batch", "-ex", "bt full", NULL);
char tid_buffer[16];
char disasm_buffer[32];
seprintf(tid_buffer, lastof(tid_buffer), "%d", tid);
std::vector<const char *> args;
args.push_back("gdb");
args.push_back("-n");
args.push_back("-p");
args.push_back(tid_buffer);
args.push_back("-batch");
args.push_back("-ex");
args.push_back("echo \\nBacktrace:\\n");
args.push_back("-ex");
args.push_back("bt full");
#ifdef WITH_SIGACTION
if (this->GetMessage() == NULL && this->signal_instruction_ptr_valid) {
seprintf(disasm_buffer, lastof(disasm_buffer), "x/1i %p", this->signal_instruction_ptr);
args.push_back("-ex");
args.push_back("set disassembly-flavor intel");
args.push_back("-ex");
args.push_back("echo \\nFault instruction:\\n");
args.push_back("-ex");
args.push_back(disasm_buffer);
}
#endif
args.push_back(NULL);
execvp("gdb", const_cast<char* const*>(&(args[0])));
exit(42);
}
@@ -210,7 +311,7 @@ class CrashLogUnix : public CrashLog {
char *buffer_orig = buffer;
buffer += seprintf(buffer, last, "Stacktrace (GDB):\n");
buffer += seprintf(buffer, last, "GDB info:\n");
while (buffer < last) {
ssize_t res = read(pipefd[0], buffer, last - buffer);
if (res < 0) {
@@ -262,8 +363,6 @@ class CrashLogUnix : public CrashLog {
*/
/* virtual */ char *LogStacktrace(char *buffer, const char *last) const
{
buffer = LogStacktraceGdb(buffer, last);
buffer += seprintf(buffer, last, "Stacktrace:\n");
#if defined(__GLIBC__)
@@ -397,16 +496,28 @@ public:
* @param signum the signal that was caused by the crash.
*/
#ifdef WITH_SIGACTION
CrashLogUnix(int signum, siginfo_t *si) :
signum(signum), si(si)
CrashLogUnix(int signum, siginfo_t *si, void *context) :
signum(signum), si(si), context(context)
{
this->signal_instruction_ptr_valid = false;
#ifdef WITH_UCONTEXT
ucontext_t *ucontext = static_cast<ucontext_t *>(context);
#if defined(__x86_64__)
this->signal_instruction_ptr = (void *) ucontext->uc_mcontext.gregs[REG_RIP];
this->signal_instruction_ptr_valid = true;
#elif defined(__i386)
this->signal_instruction_ptr = (void *) ucontext->uc_mcontext.gregs[REG_EIP];
this->signal_instruction_ptr_valid = true;
#endif
#endif /* WITH_UCONTEXT */
}
#else
CrashLogUnix(int signum) :
signum(signum)
{
}
#endif
#endif /* WITH_SIGACTION */
};
/** The signals we want our crash handler to handle. */
@@ -442,7 +553,7 @@ static void CDECL HandleCrash(int signum)
}
#ifdef WITH_SIGACTION
CrashLogUnix log(signum, si);
CrashLogUnix log(signum, si, context);
#else
CrashLogUnix log(signum);
#endif