[PATCH v3 18/41] linux-user/signal: Drop HOST_SIGNAL_PLACEHOLDER

[Richard Henderson]

Now that all of the linux-user hosts have been converted
to host-signal.h, drop the compatibility code.

Reviewed by: Warner Losh <i...@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
 include/exec/exec-all.h | 12 ------------
 linux-user/signal.c     | 14 --------------
 2 files changed, 26 deletions(-)

diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 5f94d799aa..5dd663c153 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -685,18 +685,6 @@ 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_signal_handler
- * @signum: host signal number
- * @pinfo: host siginfo_t
- * @puc: host ucontext_t
- *
- * To be called from the SIGBUS and SIGSEGV signal handler to inform the
- * virtual cpu of exceptions.  Returns true if the signal was handled by
- * the virtual CPU.
- */
-int cpu_signal_handler(int signum, void *pinfo, void *puc);
-
 #else
 static inline void mmap_lock(void) {}
 static inline void mmap_unlock(void) {}
diff --git a/linux-user/signal.c b/linux-user/signal.c
index bab47a6962..537c6c41c0 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -777,17 +777,6 @@ static void host_signal_handler(int host_sig, siginfo_t 
*info, void *puc)
     ucontext_t *uc = puc;
     struct emulated_sigtable *k;
     int guest_sig;
-
-#ifdef HOST_SIGNAL_PLACEHOLDER
-    /* the CPU emulator uses some host signals to detect exceptions,
-       we forward to it some signals */
-    if ((host_sig == SIGSEGV || host_sig == SIGBUS)
-        && info->si_code > 0) {
-        if (cpu_signal_handler(host_sig, info, puc)) {
-            return;
-        }
-    }
-#else
     uintptr_t pc = 0;
     bool sync_sig = false;
 
@@ -847,7 +836,6 @@ static void host_signal_handler(int host_sig, siginfo_t 
*info, void *puc)
 
         sync_sig = true;
     }
-#endif
 
     /* get target signal number */
     guest_sig = host_to_target_signal(host_sig);
@@ -862,7 +850,6 @@ static void host_signal_handler(int host_sig, siginfo_t 
*info, void *puc)
     k->pending = guest_sig;
     ts->signal_pending = 1;
 
-#ifndef HOST_SIGNAL_PLACEHOLDER
     /*
      * For synchronous signals, unwind the cpu state to the faulting
      * insn and then exit back to the main loop so that the signal
@@ -872,7 +859,6 @@ static void host_signal_handler(int host_sig, siginfo_t 
*info, void *puc)
         cpu->exception_index = EXCP_INTERRUPT;
         cpu_loop_exit_restore(cpu, pc);
     }
-#endif
 
     rewind_if_in_safe_syscall(puc);
 
-- 
2.25.1