qemu/linux-user/arm
Peter Maydell b10089a14c linux-user: Don't call gdb_handlesig() before queue_signal()
The CPU main-loop routines for linux-user generally
call gdb_handlesig() when they're about to queue a
SIGTRAP signal. This is wrong, because queue_signal()
will cause us to pend a signal, and process_pending_signals()
will then call gdb_handlesig() itself. So the effect is that
we notify gdb of the SIGTRAP, and then if gdb says "OK,
continue with signal X" we will incorrectly notify
gdb of the signal X as well. We don't do this double-notify
for anything else, only SIGTRAP.

Remove this unnecessary and incorrect code from all
the targets except for nios2 (whose main loop is
doing something different and broken, and will be handled
in a separate patch).

This bug only manifests if the user responds to the reported
SIGTRAP using "signal SIGFOO" rather than "continue"; since
the latter is the overwhelmingly common thing to do after a
breakpoint most people won't have hit this.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20181019174958.26616-2-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2018-11-12 15:48:00 +01:00
..
nwfpe linux-user/arm/nwfpe: Check coprocessor number for FPA emulation 2018-01-11 13:25:39 +00:00
cpu_loop.c linux-user: Don't call gdb_handlesig() before queue_signal() 2018-11-12 15:48:00 +01:00
signal.c linux-user: move get_sp_from_cpustate() to target_cpu.h 2018-06-04 01:30:44 +02:00
sockbits.h linux-user: move socket.h generic definitions to generic/sockbits.h 2018-05-25 10:10:55 +02:00
syscall_nr.h Add missing syscall nrs. according to more recent Linux kernels 2016-01-11 11:39:28 +03:00
target_cpu.h linux-user: move get_sp_from_cpustate() to target_cpu.h 2018-06-04 01:30:44 +02:00
target_elf.h linux-user: Move CPU type name selection to a function 2018-02-25 17:27:41 +01:00
target_fcntl.h linux-user: move arm/aarch64/m68k fcntl definitions to [arm|aarch64|m68k]/target_fcntl.h 2018-06-04 01:30:44 +02:00
target_signal.h linux-user: move generic signal definitions to generic/signal.h 2018-06-04 01:30:44 +02:00
target_structs.h linux-user: remove useless padding in flock64 structure 2018-05-03 18:40:19 +02:00
target_syscall.h linux-user: Add ARM get_tls syscall support 2018-04-30 09:51:31 +02:00
termbits.h linux-user: Implement ioctl cmd TIOCGPTPEER 2018-02-18 18:52:32 +01:00