user-exec: Don't reextract sigmask from usercontext pointer

Extracting the old signal mask from the usercontext pointer passed to
a signal handler is a pain because it is OS and CPU dependent.
Since we've already done it once and passed it to handle_cpu_signal(),
there's no need to do it again in cpu_exit_tb_from_sighandler().
This then means we don't need to pass a usercontext pointer in to
handle_cpu_signal() at all.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Acked-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Riku Voipio <riku.voipio@linaro.org>
Message-id: 1463494687-25947-5-git-send-email-peter.maydell@linaro.org

1 files changed, 16 insertions, 32 deletions

diff --git a/user-exec.c b/user-exec.c
index c5179a410c..b9e7bec248 100644
--- a/user-exec.c
+++ b/user-exec.c
@@ -55,25 +55,10 @@ static void exception_action(CPUState *cpu)
 /* exit the current TB from a signal handler. The host registers are
    restored in a state compatible with the CPU emulator
  */
-static void cpu_exit_tb_from_sighandler(CPUState *cpu, void *puc)
+static void cpu_exit_tb_from_sighandler(CPUState *cpu, sigset_t *old_set)
 {
-#ifdef __linux__
-    struct ucontext *uc = puc;
-#elif defined(__OpenBSD__)
-    struct sigcontext *uc = puc;
-#endif
-
     /* XXX: use siglongjmp ? */
-#ifdef __linux__
-#ifdef __ia64
-    sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
-#else
-    sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
-#endif
-#elif defined(__OpenBSD__)
-    sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
-#endif
-
+    sigprocmask(SIG_SETMASK, old_set, NULL);
     cpu_loop_exit_noexc(cpu);
 }
 
@@ -82,8 +67,7 @@ static void cpu_exit_tb_from_sighandler(CPUState *cpu, void *puc)
    write caused the exception and otherwise 0'. 'old_set' is the
    signal set which should be restored */
 static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
-                                    int is_write, sigset_t *old_set,
-                                    void *puc)
+                                    int is_write, sigset_t *old_set)
 {
     CPUState *cpu;
     CPUClass *cc;
@@ -111,7 +95,7 @@ static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
              * currently executing TB was modified and must be exited
              * immediately.
              */
-            cpu_exit_tb_from_sighandler(current_cpu, puc);
+            cpu_exit_tb_from_sighandler(current_cpu, old_set);
             g_assert_not_reached();
         default:
             g_assert_not_reached();
@@ -205,7 +189,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                              trapno == 0xe ?
                              (ERROR_sig(uc) >> 1) & 1 : 0,
-                             &MASK_sig(uc), puc);
+                             &MASK_sig(uc));
 }
 
 #elif defined(__x86_64__)
@@ -251,7 +235,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                              TRAP_sig(uc) == 0xe ?
                              (ERROR_sig(uc) >> 1) & 1 : 0,
-                             &MASK_sig(uc), puc);
+                             &MASK_sig(uc));
 }
 
 #elif defined(_ARCH_PPC)
@@ -367,7 +351,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     }
 #endif
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
-                             is_write, &uc->uc_sigmask, puc);
+                             is_write, &uc->uc_sigmask);
 }
 
 #elif defined(__alpha__)
@@ -398,7 +382,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     }
 
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
-                             is_write, &uc->uc_sigmask, puc);
+                             is_write, &uc->uc_sigmask);
 }
 #elif defined(__sparc__)
 
@@ -458,7 +442,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
         }
     }
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
-                             is_write, sigmask, NULL);
+                             is_write, sigmask);
 }
 
 #elif defined(__arm__)
@@ -493,7 +477,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     is_write = extract32(uc->uc_mcontext.error_code, 11, 1);
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                              is_write,
-                             &uc->uc_sigmask, puc);
+                             &uc->uc_sigmask);
 }
 
 #elif defined(__aarch64__)
@@ -521,7 +505,7 @@ int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
                 || (insn & 0x3a400000) == 0x28000000); /* C3.3.7,14-16 */
 
     return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
-                             is_write, &uc->uc_sigmask, puc);
+                             is_write, &uc->uc_sigmask);
 }
 
 #elif defined(__mc68000)
@@ -539,7 +523,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     is_write = 0;
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                              is_write,
-                             &uc->uc_sigmask, puc);
+                             &uc->uc_sigmask);
 }
 
 #elif defined(__ia64)
@@ -574,7 +558,7 @@ int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
     }
     return handle_cpu_signal(ip, (unsigned long)info->si_addr,
                              is_write,
-                             (sigset_t *)&uc->uc_sigmask, puc);
+                             (sigset_t *)&uc->uc_sigmask);
 }
 
 #elif defined(__s390__)
@@ -627,7 +611,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
         break;
     }
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
-                             is_write, &uc->uc_sigmask, puc);
+                             is_write, &uc->uc_sigmask);
 }
 
 #elif defined(__mips__)
@@ -643,7 +627,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     /* XXX: compute is_write */
     is_write = 0;
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
-                             is_write, &uc->uc_sigmask, puc);
+                             is_write, &uc->uc_sigmask);
 }
 
 #elif defined(__hppa__)
@@ -685,7 +669,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     }
 
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
-                             is_write, &uc->uc_sigmask, puc);
+                             is_write, &uc->uc_sigmask);
 }
 
 #else