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linux: log diagnostic message on exceptions

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Log the fact that a software exception will terminate the process and
hint about more information available from the Linux kernel log.

Fixes #1457
This commit is contained in:
Christian Helmuth
2015-03-17 17:49:56 +01:00
parent 560a58e5c6
commit 5c728cf0c4
2 changed files with 36 additions and 0 deletions
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32
repos/base-linux/src/base/thread/thread_env.cc
View File

@ -15,6 +15,8 @@
#include <base/stdint.h> #include <base/stdint.h>
#include <base/env.h> #include <base/env.h>
#include <linux_syscalls.h>
using namespace Genode; using namespace Genode;
extern addr_t * __initial_sp; extern addr_t * __initial_sp;
@ -29,6 +31,31 @@ char **lx_environ;
*/ */
int main_thread_futex_counter __attribute__((aligned(sizeof(addr_t)))); int main_thread_futex_counter __attribute__((aligned(sizeof(addr_t))));
/**
* Signal handler for exceptions like segmentation faults
*/
static void exception_signal_handler(int signum)
{
char const *reason = nullptr;
switch (signum) {
case LX_SIGILL: reason = "Illegal instruction"; break;
case LX_SIGBUS: reason = "Bad memory access"; break;
case LX_SIGFPE: reason = "Floating point exception"; break;
case LX_SIGSEGV: reason = "Segmentation fault"; break;
default: /* unexpected signal */ return;
}
PERR("%s (signum=%d), see Linux kernel log for details", reason, signum);
/*
* We reset the signal handler to SIG_DFL and trigger exception again,
* i.e., terminate the process.
*/
lx_sigaction(signum, nullptr);
return;
}
/***************************** /*****************************
** Startup library support ** ** Startup library support **
@ -46,4 +73,9 @@ void prepare_init_main_thread()
* __initial_sp[3] = environ * __initial_sp[3] = environ
*/ */
lx_environ = (char**)&__initial_sp[3]; lx_environ = (char**)&__initial_sp[3];
lx_sigaction(LX_SIGILL, exception_signal_handler);
lx_sigaction(LX_SIGBUS, exception_signal_handler);
lx_sigaction(LX_SIGFPE, exception_signal_handler);
lx_sigaction(LX_SIGSEGV, exception_signal_handler);
} }

4
repos/base-linux/src/platform/linux_syscalls.h
View File

@ -209,7 +209,11 @@ inline int lx_munmap(void *addr, size_t length)
enum { enum {
LX_SIGINT = 2, /* used by core to catch Control-C */ LX_SIGINT = 2, /* used by core to catch Control-C */
LX_SIGILL = 4, /* exception: illegal instruction */
LX_SIGBUS = 7, /* exception: bus error, i.e., bad memory access */
LX_SIGFPE = 8, /* exception: floating point */
LX_SIGUSR1 = 10, /* used for cancel-blocking mechanism */ LX_SIGUSR1 = 10, /* used for cancel-blocking mechanism */
LX_SIGSEGV = 11, /* exception: segmentation violation */
LX_SIGCHLD = 17, /* child process changed state, i.e., terminated */ LX_SIGCHLD = 17, /* child process changed state, i.e., terminated */
LX_SIGCANCEL = 32, /* accoring to glibc, this equals SIGRTMIN, LX_SIGCANCEL = 32, /* accoring to glibc, this equals SIGRTMIN,
used for killing threads */ used for killing threads */