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qemu/linux-user
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Ilya Leoshkevich 2b3ccf5f0d user: Introduce host_interrupt_signal 
Attaching to the gdbstub of a running process requires stopping its
threads. For threads that run on a CPU, cpu_exit() is enough, but the
only way to grab attention of a thread that is stuck in a long-running
syscall is to interrupt it with a signal.

Reserve a host realtime signal for this, just like it's already done
for TARGET_SIGABRT on Linux. This may reduce the number of available
guest realtime signals by one, but this is acceptable, since there are
quite a lot of them, and it's unlikely that there are apps that need
them all.

Set signal_pending for the safe_sycall machinery to prevent invoking
the syscall. This is a lie, since we don't queue a guest signal, but
process_pending_signals() can handle the absence of pending signals.
The syscall returns with QEMU_ERESTARTSYS errno, which arranges for
the automatic restart. This is important, because it helps avoiding
disturbing poorly written guests.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20250117001542.8290-5-iii@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250207153112.3939799-14-alex.bennee@linaro.org>
2025-02-10 13:47:59 +00:00
..
aarch64 user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
alpha user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
arm user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
generic linux-user: Split TARGET_PROT_* out of syscall_defs.h 2023-07-15 08:02:32 +01:00
hexagon user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
hppa user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
i386 user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
include linux-user: cleanup unused linux-user/include/host directories 2023-08-08 20:44:08 +02:00
loongarch64 user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
m68k user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
microblaze user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
mips user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
mips64 target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
openrisc user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
ppc user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
riscv user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
s390x user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
sh4 user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
sparc linux-user: Add missing /proc/cpuinfo fields for sparc 2025-01-16 20:57:17 -08:00
x86_64 target/ppc: Fix lxvx/stxvx facility check 2024-09-27 10:32:29 +01:00
xtensa user: Move 'linux-user/cpu_loop-common.h' -> 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
elfload.c accel/tcg: Include missing 'exec/translation-block.h' header 2024-12-20 17:44:57 +01:00
errnos.c.inc linux-user: Simplify host <-> target errno conversion using macros 2021-07-12 21:53:35 +02:00
exit.c accel/tcg: Move perf and debuginfo support to tcg/ 2024-01-29 21:04:10 +10:00
fd-trans.c linux-user: netlink: Add missing QEMU_IFLA entries 2025-01-24 13:58:40 +01:00
fd-trans.h linux-user: fix timerfd read endianness conversion 2023-03-10 20:42:00 +01:00
flat.h linux-user/flatload.c: Remove unused bFLT shared-library and ZFLAT code 2024-04-25 10:21:06 +01:00
flatload.c accel/tcg: Declare mmap_[un]lock() in 'exec/page-protection.h' 2024-12-20 17:44:57 +01:00
gen-vdso-elfn.c.inc linux-user: Fix GDB complaining about system-supplied DSO string table index 2024-11-05 10:36:08 +00:00
gen-vdso.c linux-user: Fix GDB complaining about system-supplied DSO string table index 2024-11-05 10:36:08 +00:00
ioctls.h linux-user: Add ioctl for BLKBSZSET 2024-06-05 09:04:30 -07:00
linux_loop.h linux-user: implement more loop ioctls 2021-11-29 14:54:17 +01:00
linuxload.c {linux,bsd}-user: Introduce get_task_state() 2024-03-06 12:35:19 +00:00
loader.h linux-user: Report AArch64 hwcap2 fields above bit 31 2023-11-02 13:36:45 +00:00
main.c system: propagate Error to gdbserver_start (and other device setups) 2025-01-17 10:44:25 +00:00
meson.build linux-user,hexagon: move to syscalltbl file 2024-09-22 09:30:18 +02:00
mmap.c accel/tcg: Move tcg_cflags_has/set() to 'exec/translation-block.h' 2024-12-20 17:44:57 +01:00
qemu.h accel/tcg: Move user-related declarations out of 'exec/cpu-all.h' (3/4) 2024-12-20 17:44:57 +01:00
semihost.c semihosting: Remove qemu_semihosting_console_outs 2022-06-28 04:41:20 +05:30
signal-common.h user: Introduce user/signal.h 2025-02-10 13:47:59 +00:00
signal.c user: Introduce host_interrupt_signal 2025-02-10 13:47:59 +00:00
socket.h Supply missing header guards 2019-06-12 13:20:21 +02:00
strace.c linux-user: Fix strace output for s390x mmap() 2024-11-22 14:20:38 -06:00
strace.h linux-user: Have do_syscall() use CPUArchState* instead of void* 2022-05-23 22:47:19 +02:00
strace.list linux-user: Trace rt_sigprocmask's sigsets 2024-10-22 13:45:03 -07:00
syscall.c user: Introduce user/signal.h 2025-02-10 13:47:59 +00:00
syscall_defs.h linux-user: netlink: Add IP_PKTINFO cmsg parsing 2025-01-24 13:58:40 +01:00
syscall_types.h linux-user: Add FITRIM ioctl 2024-04-24 15:46:00 -07:00
thunk.c user: Move 'thunk.h' from 'exec/user' to 'user' 2024-05-03 17:21:20 +02:00
trace-events linux-user: Rename user_force_sig tracepoint to match function name 2022-01-18 12:41:42 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
uaccess.c meson: Make DEBUG_REMAP a meson option 2024-04-24 15:46:00 -07:00
uname.c linux-user: Remove pointless CPU{ARCH}State casts 2022-05-23 22:47:20 +02:00
uname.h linux-user: Have do_syscall() use CPUArchState* instead of void* 2022-05-23 22:47:19 +02:00
user-internals.h user: Declare cpu_loop() once in 'user/cpu_loop.h' 2024-12-20 17:44:57 +01:00
user-mmap.h linux-user: Move shmat and shmdt implementations to mmap.c 2023-09-01 13:35:02 -07:00
vm86.c linux-user/vm86: Fix compilation with Clang 2024-10-13 10:34:00 -07:00