qemu/linux-user
Peter Maydell c599d4d6d6 linux-user: SIGSEGV from sigreturn need not be fatal
If the sigreturn syscall fails to read memory then this causes a
SIGSEGV, but this is not necessarily a fatal signal -- the guest
process can catch it.

We don't implement this correctly because the behaviour of QEMU's
force_sig() function has drifted away from the kernel function of the
same name -- ours now does "always do a guest core dump and abort
execution", whereas the kernel version simply forces the guest to
take a signal, which may or may not eventually cause a core dump.

Rename our force_sig() to dump_core_and_abort(), and provide a
force_sig() which acts more like the kernel version as the sigreturn
implementations expect it to.  Since force_sig() now returns, we must
update all the callsites to return -TARGET_QEMU_ESIGRETURN so that
the main loop doesn't change the guest registers before the signal
handler is invoked.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
2016-09-21 22:01:45 +03:00
..
aarch64 linux-user: AArch64 has sync_file_range, not sync_file_range2 2016-07-19 16:18:11 +03:00
alpha linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
arm linux-user: Use correct target SHMLBA in shmat() 2016-09-21 14:28:52 +03:00
cris linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
host linux-user: Clean up hostdep.h header guards 2016-07-12 16:19:16 +02:00
i386 linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
m68k linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
microblaze linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
mips linux-user: Use correct target SHMLBA in shmat() 2016-09-21 14:28:52 +03:00
mips64 linux-user: Use correct target SHMLBA in shmat() 2016-09-21 14:28:52 +03:00
openrisc linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
ppc linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
s390x linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
sh4 linux-user: Use correct target SHMLBA in shmat() 2016-09-21 14:28:52 +03:00
sparc linux-user: Use correct target SHMLBA in shmat() 2016-09-21 14:28:52 +03:00
sparc64 linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
tilegx Clean up ill-advised or unusual header guards 2016-07-12 16:20:46 +02:00
unicore32 linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
x86_64 linux-user: Fix target_semid_ds structure definition 2016-08-04 16:36:53 +03:00
elfload.c linux-user: Use glib malloc functions in load_symbols() 2016-09-21 14:28:20 +03:00
errno_defs.h linux-user: Renumber TARGET_QEMU_ESIGRETURN, make it not arch-specific 2016-05-27 14:49:49 +03:00
flat.h
flatload.c linux-user: Fix error handling in flatload.c target_pread() 2016-09-21 14:27:19 +03:00
ioctls.h linux-user: Implement FS_IOC_GETFLAGS and FS_IOC_SETFLAGS ioctls 2016-09-21 14:24:47 +03:00
linux_loop.h linux-user: Add loop control ioctls 2016-07-19 15:22:33 +03:00
linuxload.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
m68k-sim.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
main.c linux-user: Pass si_type information to queue_signal() explicitly 2016-09-21 22:01:28 +03:00
Makefile.objs linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
mmap.c os-posix: include sys/mman.h 2016-06-16 18:39:03 +02:00
qemu.h linux-user: Pass si_type information to queue_signal() explicitly 2016-09-21 22:01:28 +03:00
safe-syscall.S linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
signal.c linux-user: SIGSEGV from sigreturn need not be fatal 2016-09-21 22:01:45 +03:00
socket.h linux-user: support SO_PASSSEC setsockopt option 2014-06-29 14:19:59 +03:00
strace.c linux-user: report signals being taken in strace output 2016-09-21 14:25:59 +03:00
strace.list linux-user: update get_thread_area/set_thread_area strace 2016-06-26 13:17:21 +03:00
syscall_defs.h linux-user: Check for bad event numbers in epoll_wait 2016-09-21 14:25:26 +03:00
syscall_types.h linux-user: Correct type for LOOP_GET_STATUS{,64} ioctls 2016-07-19 15:23:16 +03:00
syscall.c linux-user: Pass si_type information to queue_signal() explicitly 2016-09-21 22:01:28 +03:00
target_flat.h
trace-events trace-events: fix first line comment in trace-events 2016-08-12 10:36:01 +01:00
uaccess.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
uname.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
uname.h Clean up decorations and whitespace around header guards 2016-07-12 16:20:46 +02:00
vm86.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00