bsd-user/signal.c: implement cpu_loop_exit_sigbus

First attempt at implementing cpu_loop_exit_sigbus, mostly copied from
linux-user version of this function.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Kyle Evans <kevans@freebsd.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/bsd-user/signal.c b/bsd-user/signal.c
index 12de0e2..844dfa1 100644 (file)
--- a/bsd-user/signal.c
+++ b/bsd-user/signal.c
@@ -80,7 +80,13 @@ void cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr,
 void cpu_loop_exit_sigbus(CPUState *cpu, target_ulong addr,
                           MMUAccessType access_type, uintptr_t ra)
 {
-    qemu_log_mask(LOG_UNIMP, "No signal support for SIGBUS\n");
-    /* unreachable */
-    abort();
+    const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops;
+
+    if (tcg_ops->record_sigbus) {
+        tcg_ops->record_sigbus(cpu, addr, access_type, ra);
+    }
+
+    force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, addr);
+    cpu->exception_index = EXCP_INTERRUPT;
+    cpu_loop_exit_restore(cpu, ra);
 }