linux-user: Add cpu_loop_exit_sigsegv

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>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 5dd663c153..f74578500c 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -685,6 +685,21 @@ MMUAccessType adjust_signal_pc(uintptr_t *pc, bool is_write);
 bool handle_sigsegv_accerr_write(CPUState *cpu, sigset_t *old_set,
                                  uintptr_t host_pc, abi_ptr guest_addr);
 
+/**
+ * cpu_loop_exit_sigsegv:
+ * @cpu: the cpu context
+ * @addr: the guest address of the fault
+ * @access_type: access was read/write/execute
+ * @maperr: true for invalid page, false for permission fault
+ * @ra: host pc for unwinding
+ *
+ * Use the TCGCPUOps hook to record cpu state, do guest operating system
+ * specific things to raise SIGSEGV, and jump to the main cpu loop.
+ */
+void QEMU_NORETURN cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr,
+                                         MMUAccessType access_type,
+                                         bool maperr, uintptr_t ra);
+
 #else
 static inline void mmap_lock(void) {}
 static inline void mmap_unlock(void) {}