http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52205
Bug #: 52205
Summary: SPARC Solaris 2.11 unwind through signal handler fails
with -fnon-call-exceptions
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Compile this C++ program with -fnon-call-exceptions:
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void
die(const char* msg)
{
perror(msg);
exit(EXIT_FAILURE);
}
void
handler(int signo, siginfo_t* info, void *context)
{
printf("in handler signal %d\n", signo);
throw signo;
}
int
main(int, const char**)
{
struct sigaction act;
memset(&act, 0, sizeof act);
act.sa_sigaction = handler;
sigfillset(&act.sa_mask);
act.sa_flags = SA_SIGINFO;
if (sigaction(SIGSEGV, &act, NULL) != 0)
die("sigaction");
try
{
*reinterpret_cast<char*>(0) = 1;
}
catch (int signo)
{
printf("caught signal %d\n", signo);
exit(EXIT_SUCCESS);
}
printf("did not catch\n");
exit(EXIT_FAILURE);
}
When this program is run, it should print something like
in handler signal 11
caught signal 11
This works fine on GNU/Linux and on x86 and x86_64 Solaris 2.11. When run on
SPARC Solaris 2.11, however, it prints
in handler signal 11
Segmentation Fault
I see this in both 32-bit and 64-bit mode. If I tweak
libgcc/config/sparc/sol2-unwind.h so that sparc_is_sighandler sets *nframes to
3 rather than 2, then the test passes (I only tried this in 32-bit mode, not in
64-bit mode). The cuh_pattern test in sparc_is_sighandler does not match, so
presumably it needs to be adjusted for Solaris 2.11. However, I'm not sure how
to properly and safely correct it.
