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* linux-user: Create vdso_sigreturn_region_{start,end}Richard Henderson2025-09-231-0/+2
| | | | | | | These variables will be populated from the vdso, and used for detecting whether we are executing the sigreturn. Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* accel/tcg: Use vaddr in cpu_loop.hRichard Henderson2025-05-051-2/+2
| | | | | | | Use vaddr instead of abi_ptr or target_ulong for a guest address. Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* user: Prefer cached CpuClass over CPU_GET_CLASS() macroPhilippe Mathieu-Daudé2025-03-091-2/+2
| | | | | | | | | | CpuState caches its CPUClass since commit 6fbdff87062 ("cpu: cache CPUClass in CPUState for hot code paths"), use it. Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20250122093028.52416-7-philmd@linaro.org>
* accel/tcg: Rename 'hw/core/tcg-cpu-ops.h' -> 'accel/tcg/cpu-ops.h'Philippe Mathieu-Daudé2025-03-061-1/+1
| | | | | | | | | | | | | | TCGCPUOps structure makes more sense in the accelerator context rather than hardware emulation. Move it under the accel/tcg/ scope. Mechanical change doing: $ sed -i -e 's,hw/core/tcg-cpu-ops.h,accel/tcg/cpu-ops.h,g' \ $(git grep -l hw/core/tcg-cpu-ops.h) Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20250123234415.59850-11-philmd@linaro.org>
* user: Introduce host_interrupt_signalIlya Leoshkevich2025-02-101-5/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* user: Introduce user/signal.hIlya Leoshkevich2025-02-101-0/+1
| | | | | | | | | | | | gdbstub needs target_to_host_signal(), so move its declaration to a public header. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Warner Losh <imp@bsdimp.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Message-Id: <20250117001542.8290-4-iii@linux.ibm.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20250207153112.3939799-13-alex.bennee@linaro.org>
* user: Move various declarations out of 'exec/exec-all.h'Philippe Mathieu-Daudé2024-12-201-0/+1
| | | | | | | | | | Move various declarations related to user emulation from "exec/exec-all.h" to "user/cpu_loop.h". Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20241212185341.2857-19-philmd@linaro.org>
* accel/tcg: Move user-related declarations out of 'exec/cpu-all.h' (4/4)Philippe Mathieu-Daudé2024-12-201-0/+1
| | | | | | | | | | Move declarations related to page protection under user emulation from "exec/cpu-all.h" to "user/page-protection.h". Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20241212185341.2857-15-philmd@linaro.org>
* linux-user: Allow custom rt signal mappingsIlya Leoshkevich2024-11-051-20/+88
| | | | | | | | | | | | | | | | | | | | | | | Some applications want to use low priority realtime signals (e.g., SIGRTMAX). Currently QEMU cannot map all target realtime signals to host realtime signals, and chooses to sacrifice the end of the target realtime signal range. Allow users to choose how to map target realtime signals to host realtime signals using the new -t option, the new QEMU_RTSIG_MAP environment variable, and the new -Drtsig_map=\"...\" meson flag. To simplify things, the meson flag is not per-target, because the intended use case is app-specific qemu-user builds. The mapping is specified using the "tsig hsig count[,...]" syntax. Target realtime signals [tsig,tsig+count) are mapped to host realtime signals [hsig,hsig+count). Care is taken to avoid double and out-of-range mappings. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20241029232211.206766-2-iii@linux.ibm.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* exec/cpu: Extract page-protection definitions to page-protection.hPhilippe Mathieu-Daudé2024-05-061-0/+1
| | | | | | | | | | | | | | | | Extract page-protection definitions from "exec/cpu-all.h" to "exec/page-protection.h". The list of files requiring the new header was generated using: $ git grep -wE \ 'PAGE_(READ|WRITE|EXEC|RWX|VALID|ANON|RESERVED|TARGET_.|PASSTHROUGH)' Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Acked-by: Nicholas Piggin <npiggin@gmail.com> Acked-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20240427155714.53669-3-philmd@linaro.org>
* linux-user: Preserve unswapped siginfo_t for straceRichard Henderson2024-04-091-3/+9
| | | | | | | | | | Passing the tswapped structure to strace means that our internal si_type is also gone, which then aborts in print_siginfo. Fixes: 4d6d8a05a0a ("linux-user: Move tswap_siginfo out of target code") Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* gdbstub: Save target's siginfoGustavo Romero2024-03-131-1/+4
| | | | | | | | | | | | | Save target's siginfo into gdbserver_state so it can be used later, for example, in any stub that requires the target's si_signo and si_code. This change affects only linux-user mode. Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org> Suggested-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20240309030901.1726211-4-gustavo.romero@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Move tswap_siginfo out of target codeGustavo Romero2024-03-131-2/+8
| | | | | | | | | | | Move tswap_siginfo from target code to handle_pending_signal. This will allow some cleanups and having the siginfo ready to be used in gdbstub. Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org> Suggested-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20240309030901.1726211-3-gustavo.romero@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
* gdbstub: Rename back gdb_handlesigGustavo Romero2024-03-131-1/+1
| | | | | | | | | | | | Rename gdb_handlesig_reason back to gdb_handlesig. There is no need to add a wrapper for gdb_handlesig and rename it when a new parameter is added. Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20240309030901.1726211-2-gustavo.romero@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
* user: Prefer fast cpu_env() over slower CPU QOM cast macroPhilippe Mathieu-Daudé2024-03-121-4/+2
| | | | | | | | | | | Mechanical patch produced running the command documented in scripts/coccinelle/cpu_env.cocci_template header. Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Warner Losh <imp@bsdimp.com> Message-ID: <20240129164514.73104-30-philmd@linaro.org> Signed-off-by: Thomas Huth <thuth@redhat.com>
* {linux,bsd}-user: Introduce get_task_state()Ilya Leoshkevich2024-03-061-15/+15
| | | | | | | | | | | | | | A CPU's TaskState is stored in the CPUState's void *opaque field, accessing which is somewhat awkward due to having to use a cast. Introduce a wrapper and use it everywhere. Suggested-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20240219141628.246823-3-iii@linux.ibm.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20240305121005.3528075-4-alex.bennee@linaro.org>
* include/qemu: Add TCGCPUOps typedef to typedefs.hRichard Henderson2024-01-291-2/+2
| | | | | | | QEMU coding style recommends using structure typedefs. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Fixed cpu restore with pc 0 on SIGBUSRobbin Ehn2024-01-231-2/+3
| | | | | | | | | | | | | Commit f4e1168198 (linux-user: Split out host_sig{segv,bus}_handler) introduced a bug, when returning from host_sigbus_handler the PC is never set. Thus cpu_loop_exit_restore is called with a zero PC and we immediate get a SIGSEGV. Signed-off-by: Robbin Ehn <rehn@rivosinc.com> Fixes: f4e1168198 ("linux-user: Split out host_sig{segv,bus}_handler") Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com> Message-Id: <33f27425878fb529b9e39ef22c303f6e0d90525f.camel@rivosinc.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Fix guest signal remapping after adjusting SIGABRTRichard Henderson2023-10-301-5/+4
| | | | | | | | | | | The arithmetic within the loop was not adjusted properly after SIGRTMIN was stolen for the guest SIGABRT. The effect was that the guest libc could not send itself __SIGRTMIN to wake sleeping threads. Fixes: 38ee0a7dfb4b ("linux-user: Remap guest SIGABRT") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1967 Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Remap guest SIGABRTRichard Henderson2023-10-181-7/+35
| | | | | | | | | | | | | | Distinguish host SIGABRT from guest SIGABRT by mapping the guest signal onto one of the host RT signals. This prevents a cycle by which a host assertion failure is caught and handled by host_signal_handler, queued for the guest, and then we attempt to continue past the host abort. What happens next depends on the host libc, but is neither good nor helpful. Acked-by: Helge Deller <deller@gmx.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Detect and report host SIGILL, SIGFPE, SIGTRAPRichard Henderson2023-10-181-1/+43
| | | | | | | | These signals, when not spoofed via kill(), are always bugs. Use die_from_signal to report this sensibly. Acked-by: Helge Deller <deller@gmx.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Split out host_sig{segv,bus}_handlerRichard Henderson2023-10-181-60/+85
| | | | | | | Make host_signal_handler slightly easier to read. Acked-by: Helge Deller <deller@gmx.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Simplify signal_initRichard Henderson2023-10-181-20/+22
| | | | | | | | | Install the host signal handler at the same time we are probing the target signals for SIG_IGN/SIG_DFL. Ignore unmapped target signals. Acked-by: Helge Deller <deller@gmx.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Map unsupported signals to an out-of-bounds valueRichard Henderson2023-10-181-34/+38
| | | | | | | | Do not return a valid signal number in one domain when given an invalid signal number in the other domain. Acked-by: Helge Deller <deller@gmx.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Only register handlers for core_dump_signal by defaultRichard Henderson2023-10-181-29/+14
| | | | | | | | | | | | The set of fatal signals is really immaterial. If one arrives, and is unhandled, then the qemu process dies and the parent gets the correct signal. It is only for those signals which we would like to perform a guest core dump instead of a host core dump that we need to catch. Acked-by: Helge Deller <deller@gmx.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Detect and report host crashesHelge Deller2023-10-181-6/+63
| | | | | | | | | | | | | If there is an internal program error in the qemu source code which raises SIGSEGV or SIGBUS, we currently assume the signal belongs to the guest. With an artificial error introduced, we will now print QEMU internal SIGSEGV {code=MAPERR, addr=(nil)} Signed-off-by: Helge Deller <deller@gmx.de> Message-Id: <20230812164314.352131-1-deller@gmx.de> [rth: Use in_code_gen_buffer and die_with_signal; drop backtrace] Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Exit not abort in die_with_backtraceRichard Henderson2023-10-181-1/+1
| | | | | | | | | | | | This line is supposed to be unreachable, but if we're going to have it at all, SIGABRT via abort() is subject to the same signal peril that created this function in the first place. We can _exit immediately without peril. Acked-by: Helge Deller <deller@gmx.de> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Split out die_with_signalRichard Henderson2023-10-181-24/+28
| | | | | | | | | Because we trap so many signals for use by the guest, we have to take extra steps to exit properly. Acked-by: Helge Deller <deller@gmx.de> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* build: Remove --enable-gprofRichard Henderson2023-10-041-5/+0
| | | | | | | | | | | This build option has been deprecated since 8.0. Remove all CONFIG_GPROF code that depends on that, including one errant check using TARGET_GPROF. Acked-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* accel/tcg: Replace CPUState.env_ptr with cpu_env()Richard Henderson2023-10-041-8/+7
| | | | | Reviewed-by: Anton Johansson <anjo@rev.ng> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* gdbstub: move chunks of user code into own filesAlex Bennée2023-03-071-1/+1
| | | | | | | | | | | | | | | | The process was pretty similar to the softmmu move except we take the time to split stuff between user.c and user-target.c to avoid as much target specific compilation as possible. We also start to make use of our shiny new header scheme so the user-only helpers can be included without the rest of the exec/gsbstub.h cruft. As before we split some functions into user and softmmu versions Reviewed-by: Fabiano Rosas <farosas@suse.de> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20230302190846.2593720-12-alex.bennee@linaro.org> Message-Id: <20230303025805.625589-12-richard.henderson@linaro.org>
* linux-user: Clean up when exiting due to a signalIlya Leoshkevich2023-01-161-3/+5
| | | | | | | | | | | | | | | When exiting due to an exit() syscall, qemu-user calls preexit_cleanup(), but this is currently not the case when exiting due to a signal. This leads to various buffers not being flushed (e.g., for gprof, for gcov, and for the upcoming perf support). Add the missing call. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230112152013.125680-2-iii@linux.ibm.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Add missing signals in strace outputHelge Deller2022-09-271-34/+3
| | | | | | | | | | | | | | | | | | Some of the guest signal numbers are currently not converted to their representative names in the strace output, e.g. SIGVTALRM. This patch introduces a smart way to generate and keep in sync the host-to-guest and guest-to-host signal conversion tables for usage in the qemu signal and strace code. This ensures that any signals will now show up in both tables. There is no functional change in this patch - with the exception that yet missing signal names now show up in the strace code too. Signed-off-by: Helge Deller <deller@gmx.de> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20220918194555.83535-2-deller@gmx.de> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
* compiler.h: replace QEMU_NORETURN with G_NORETURNMarc-André Lureau2022-04-211-1/+2
| | | | | | | | | | | | | G_NORETURN was introduced in glib 2.68, fallback to G_GNUC_NORETURN in glib-compat. Note that this attribute must be placed before the function declaration (bringing a bit of consistency in qemu codebase usage). Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Warner Losh <imp@bsdimp.com> Message-Id: <20220420132624.2439741-20-marcandre.lureau@redhat.com>
* linux-user: Split out helpers for sigsuspendRichard Henderson2022-03-221-0/+23
| | | | | | | | | | Two new functions: process_sigsuspend_mask and finish_sigsuspend_mask. Move the size check and copy-from-user code. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20220315084308.433109-3-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
* linux-user: Remove stale "not threadsafe" commentsPeter Maydell2022-03-081-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | In linux-user/signal.c we have two FIXME comments claiming that parts of the signal-handling code are not threadsafe. These are very old, as they were first introduced in commit 624f7979058 in 2008. Since then we've radically overhauled the signal-handling logic, while carefully preserving these FIXME comments. It's unclear exactly what thread-safety issue the original author was trying to point out -- the relevant data structures are in the TaskStruct, which makes them per-thread and only operated on by that thread. The old code at the time of that commit did have various races involving signal handlers being invoked at awkward times; possibly this was what was meant. Delete these FIXME comments: * they were written at a time when the way we handled signals was completely different * the code today appears to us to not have thread-safety issues * nobody knows what the problem the comments were trying to point out was so they are serving no useful purpose for us today. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Warner Losh <imp@bsdimp.com> Message-Id: <20220114155032.3767771-1-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
* linux-user: Introduce host_sigcontextRichard Henderson2022-02-091-2/+2
| | | | | | | | | Do not directly access ucontext_t as the third signal parameter. This is preparation for a sparc64 fix. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Introduce host_signal_maskRichard Henderson2022-02-091-10/+8
| | | | | | | | | Do not directly access the uc_sigmask member. This is preparation for a sparc64 fix. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Return void from queue_signal()Peter Maydell2022-01-181-3/+2
| | | | | | | | | | | | | | | | | The linux-user queue_signal() function always returns 1, and none of its callers check the return value. Give it a void return type instead. The return value is a leftover from the old pre-2016 linux-user signal handling code, which really did have a queue of signals and so might return a failure indication if too many signals were queued at once. The current design avoids having to ever have more than one signal queued via queue_signal() at once, so it can never fail. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20220114153732.3767229-4-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
* linux-user: Rename user_force_sig tracepoint to match function namePeter Maydell2022-01-181-1/+1
| | | | | | | | | | | | In commit c599d4d6d6e9bfdb64 in 2016 we renamed the old force_sig() function to dump_core_and_abort(), but we forgot to rename the associated tracepoint. Rename the tracepoint to to match the function it's called from. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20220114153732.3767229-3-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
* linux-user/nios2: Use set_sigmask in do_rt_sigreturnRichard Henderson2022-01-061-2/+0
| | | | | | | | | | Using do_sigprocmask directly was incorrect, as it will leave the signal blocked by the outer layers of linux-user. Reviewed-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20211221025012.1057923-8-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
* linux-user/signal: Map exit signals in SIGCHLD siginfo_tMatthias Schiffer2022-01-061-1/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When converting a siginfo_t from waitid(), the interpretation of si_status depends on the value of si_code: For CLD_EXITED, it is an exit code and should be copied verbatim. For other codes, it is a signal number (possibly with additional high bits from ptrace) that should be mapped. This code was previously changed in commit 1c3dfb506ea3 ("linux-user/signal: Decode waitid si_code"), but the fix was incomplete. Tested with the following test program: #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/wait.h> int main() { pid_t pid = fork(); if (pid == 0) { exit(12); } else { siginfo_t siginfo = {}; waitid(P_PID, pid, &siginfo, WEXITED); printf("Code: %d, status: %d\n", (int)siginfo.si_code, (int)siginfo.si_status); } pid = fork(); if (pid == 0) { raise(SIGUSR2); } else { siginfo_t siginfo = {}; waitid(P_PID, pid, &siginfo, WEXITED); printf("Code: %d, status: %d\n", (int)siginfo.si_code, (int)siginfo.si_status); } } Output with an x86_64 host and mips64el target before 1c3dfb506ea3 (incorrect: exit code 12 is translated like a signal): Code: 1, status: 17 Code: 2, status: 17 After 1c3dfb506ea3 (incorrect: signal number is not translated): Code: 1, status: 12 Code: 2, status: 12 With this patch: Code: 1, status: 12 Code: 2, status: 17 Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <81534fde7cdfc6acea4889d886fbefdd606630fb.1635019124.git.mschiffer@universe-factory.net> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
* common-user: Move safe-syscall.* from linux-userRichard Henderson2021-12-201-1/+1
| | | | | | | | | | | Move linux-user safe-syscall.S and safe-syscall-error.c to common-user so that bsd-user can also use it. Also move safe-syscall.h to include/user/. Since there is nothing here that is related to the guest, as opposed to the host, build it once. Reviewed-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Rename TARGET_ERESTARTSYS to QEMU_ERESTARTSYSRichard Henderson2021-12-191-3/+3
| | | | | | | | | This value is fully internal to qemu, and so is not a TARGET define. We use this as an extra marker for both host and target errno. Reviewed-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Remove HAVE_SAFE_SYSCALL and hostdep.hRichard Henderson2021-12-191-2/+0
| | | | | | | | | All supported hosts now define HAVE_SAFE_SYSCALL, so remove the ifdefs. This leaves hostdep.h empty, so remove it. Reviewed-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user/signal.c: Create a common rewind_if_in_safe_syscallWarner Losh2021-11-231-3/+12
| | | | | | | | | | | | | | | | All instances of rewind_if_in_safe_syscall are the same, differing only in how the instruction point is fetched from the ucontext and the size of the registers. Use host_signal_pc and new host_signal_set_pc interfaces to fetch the pointer to the PC and adjust if needed. Delete all the old copies of rewind_if_in_safe_syscall. Acked-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20211113045603.60391-3-imp@bsdimp.com> [rth: include safe-syscall.h, simplify ifdefs] Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Handle BUS_ADRALN in host_signal_handlerRichard Henderson2021-11-021-0/+3
| | | | | | | | Handle BUS_ADRALN via cpu_loop_exit_sigbus, but allow other SIGBUS si_codes to continue into the host-to-guest signal conversion code. Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Add cpu_loop_exit_sigbusRichard Henderson2021-11-021-0/+14
| | | | | | | | | This is a new interface to be provided by the os emulator for raising SIGBUS on fault. Use the new record_sigbus target hook. Reviewed-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* accel/tcg: Restrict TCGCPUOps::tlb_fill() to sysemuRichard Henderson2021-11-021-3/+0
| | | | | | | | We have replaced tlb_fill with record_sigsegv for user mode. Move the declaration to restrict it to system emulation. Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
* linux-user: Add cpu_loop_exit_sigsegvRichard Henderson2021-11-021-8/+22
| | | | | | | | | This is a new interface to be provided by the os emulator for raising SIGSEGV on fault. Use the new record_sigsegv target hook. Reviewed by: Warner Losh <imp@bsdimp.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>