ExternalVendorCode/genode
1
0
Fork 0
mirror of https://github.com/genodelabs/genode.git synced 2025-06-18 23:28:29 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

linux: log diagnostic message on exceptions

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

32
repos/base-linux/src/base/thread/thread_env.cc
View File

@ -15,6 +15,8 @@
#include <base/stdint.h>
#include <base/env.h>
#include <linux_syscalls.h>
using namespace Genode;
extern addr_t * __initial_sp;
@ -29,6 +31,31 @@ char **lx_environ;
*/
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 **
@ -46,4 +73,9 @@ void prepare_init_main_thread()
* __initial_sp[3] = environ
*/
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);
}