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Peter Maydell acebed948c linux-user/arm: Deliver SIGTRAP for UDF patterns used as breakpoints 
The Linux kernel doesn't use the official bkpt insn for breakpoints;
instead it uses three instructions in the guaranteed-to-UNDEF space,
and generates SIGTRAP for these rather than the SIGILL that most
UNDEF insns generate:

https://elixir.bootlin.com/linux/v5.9.8/source/arch/arm/kernel/ptrace.c#L197

Make QEMU treat these insns specially too.  The main benefit of this
is that if you're running a debugger on a guest program that runs
into a GCC __builtin_trap() or LLVM "trap because execution should
never reach here" then you'll get the expected signal rather than a
SIGILL.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20201117155634.6924-1-peter.maydell@linaro.org
2020-11-23 11:04:51 +00:00
..
aarch64 linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
alpha linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
arm linux-user/arm: Deliver SIGTRAP for UDF patterns used as breakpoints 2020-11-23 11:04:51 +00:00
cris linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
generic linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
host linux-user/: fix some comment spelling errors 2020-09-17 20:39:22 +02:00
hppa linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
i386 linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
m68k linux-user: Correct definition of stack_t 2020-11-11 10:59:39 +01:00
microblaze linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
mips linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
mips64 linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
nios2 linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
openrisc linux-user: update syscall_nr.h to Linux 5.9-rc7 2020-10-26 11:39:23 +01:00
ppc linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
riscv linux-user: update syscall_nr.h to Linux 5.9-rc7 2020-10-26 11:39:23 +01:00
s390x linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
sh4 linux-user: Correct definition of stack_t 2020-11-11 10:59:39 +01:00
sparc linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
sparc64 linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
tilegx linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
x86_64 linux user: Fix Lesser GPL version number 2020-11-15 16:41:26 +01:00
xtensa linux-user: update syscall.tbl to Linux 5.9-rc7 2020-10-26 11:39:23 +01:00
cpu_loop-common.h cpu: Replace ENV_GET_CPU with env_cpu 2019-06-10 07:03:34 -07:00
elfload.c linux-user: Check copy_from_user() return value in vma_dump_size() 2020-11-04 22:28:05 +01:00
errno_defs.h Supply missing header guards 2019-06-12 13:20:21 +02:00
exit.c build: move TARGET_GPROF to config-host.mak 2020-02-12 16:29:27 +01:00
fd-trans.c linux-user,netlink: add IFLA_BRPORT_MRP_RING_OPEN, IFLA_BRPORT_MRP_IN_OPEN 2020-11-17 15:22:52 +01:00
fd-trans.h linux-user: move TargetFdTrans functions to their own file 2018-09-25 22:36:47 +02:00
flat.h linux-user/: fix some comment spelling errors 2020-09-17 20:39:22 +02:00
flatload.c linux-user/: fix some comment spelling errors 2020-09-17 20:39:22 +02:00
ioctls.h linux-user: Add support for btrfs ioctls used to scrub a filesystem 2020-09-03 01:09:35 +02:00
linux_loop.h linux-user: Add loop control ioctls 2016-07-19 15:22:33 +03:00
linuxload.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
main.c trace: remove argument from trace_init_file 2020-11-11 13:08:09 +00:00
meson.build meson: linux-user 2020-08-21 06:30:38 -04:00
mmap.c linux-user: Set PAGE_TARGET_1 for TARGET_PROT_BTI 2020-10-27 10:44:02 +00:00
qemu.h linux-user/elfload: Parse NT_GNU_PROPERTY_TYPE_0 notes 2020-10-27 10:44:02 +00:00
safe-syscall.S linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
signal-common.h linux-user: Make sigaltstack stacks per-thread 2019-07-26 19:24:33 +02:00
signal.c qemu/atomic.h: rename atomic_ to qatomic_ 2020-09-23 16:07:44 +01:00
socket.h Supply missing header guards 2019-06-12 13:20:21 +02:00
strace.c linux-user: Add strace support for printing OFD fcntl operations 2020-09-01 11:47:12 +02:00
strace.list linux-user: Add strace support for printing arguments of some clock and time functions 2020-08-27 12:29:50 +02:00
syscall_defs.h linux-user: Set PAGE_TARGET_1 for TARGET_PROT_BTI 2020-10-27 10:44:02 +00:00
syscall_types.h linux-user: Add support for btrfs ioctls used to scrub a filesystem 2020-09-03 01:09:35 +02:00
syscall.c linux-user: Prevent crash in epoll_ctl 2020-11-11 11:01:08 +01:00
target_flat.h Supply missing header guards 2019-06-12 13:20:21 +02:00
trace-events linux-user: fix use of SIGRTMIN 2020-02-12 18:56:41 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
uaccess.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
uname.c cpu: Replace ENV_GET_CPU with env_cpu 2019-06-10 07:03:34 -07:00
uname.h Clean up decorations and whitespace around header guards 2016-07-12 16:20:46 +02:00
vm86.c linux-user: Use `qemu_log' for non-strace logging 2020-02-19 11:17:40 +01:00