bsd-user/signal.c: Implement cpu_loop_exit_sigsegv

[mirror_qemu.git] / bsd-user / signal.c

diff --git a/bsd-user/signal.c b/bsd-user/signal.c
index 05b277c6422ea81700652c74e9cd13da1adf0962..12de0e2dea41f78fe9373e611751293aadd7d0d0 100644 (file)
--- a/bsd-user/signal.c
+++ b/bsd-user/signal.c
@@ -19,6 +19,8 @@
 
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "signal-common.h"
+#include "hw/core/tcg-cpu-ops.h"
 
 /*
  * Stubbed out routines until we merge signal support from bsd-user
@@ -34,6 +36,23 @@ void queue_signal(CPUArchState *env, int sig, target_siginfo_t *info)
     qemu_log_mask(LOG_UNIMP, "No signal queueing, dropping signal %d\n", sig);
 }
 
+/*
+ * Force a synchronously taken QEMU_SI_FAULT signal. For QEMU the
+ * 'force' part is handled in process_pending_signals().
+ */
+void force_sig_fault(int sig, int code, abi_ulong addr)
+{
+    CPUState *cpu = thread_cpu;
+    CPUArchState *env = cpu->env_ptr;
+    target_siginfo_t info = {};
+
+    info.si_signo = sig;
+    info.si_errno = 0;
+    info.si_code = code;
+    info.si_addr = addr;
+    queue_signal(env, sig, &info);
+}
+
 void signal_init(void)
 {
 }
@@ -45,9 +64,17 @@ void process_pending_signals(CPUArchState *cpu_env)
 void cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr,
                            MMUAccessType access_type, bool maperr, uintptr_t ra)
 {
-    qemu_log_mask(LOG_UNIMP, "No signal support for SIGSEGV\n");
-    /* unreachable */
-    abort();
+    const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops;
+
+    if (tcg_ops->record_sigsegv) {
+        tcg_ops->record_sigsegv(cpu, addr, access_type, maperr, ra);
+    }
+
+    force_sig_fault(TARGET_SIGSEGV,
+                    maperr ? TARGET_SEGV_MAPERR : TARGET_SEGV_ACCERR,
+                    addr);
+    cpu->exception_index = EXCP_INTERRUPT;
+    cpu_loop_exit_restore(cpu, ra);
 }
 
 void cpu_loop_exit_sigbus(CPUState *cpu, target_ulong addr,