target/alpha: Implement alpha_cpu_record_sigbus

Record trap_arg{0,1,2} for the linux-user signal frame.

Raise SIGBUS directly from cpu_loop_exit_sigbus, which means
we can remove the code for EXCP_UNALIGN in cpu_loop.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 22 insertions, 8 deletions

diff --git a/target/alpha/mem_helper.c b/target/alpha/mem_helper.c
index 75e72bc..47283a0 100644
--- a/target/alpha/mem_helper.c
+++ b/target/alpha/mem_helper.c
@@ -23,18 +23,12 @@
 #include "exec/exec-all.h"
 #include "exec/cpu_ldst.h"
 
-/* Softmmu support */
-#ifndef CONFIG_USER_ONLY
-void alpha_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
-                                   MMUAccessType access_type,
-                                   int mmu_idx, uintptr_t retaddr)
+static void do_unaligned_access(CPUAlphaState *env, vaddr addr, uintptr_t retaddr)
 {
-    AlphaCPU *cpu = ALPHA_CPU(cs);
-    CPUAlphaState *env = &cpu->env;
     uint64_t pc;
     uint32_t insn;
 
-    cpu_restore_state(cs, retaddr, true);
+    cpu_restore_state(env_cpu(env), retaddr, true);
 
     pc = env->pc;
     insn = cpu_ldl_code(env, pc);
@@ -42,6 +36,26 @@ void alpha_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
     env->trap_arg0 = addr;
     env->trap_arg1 = insn >> 26;                /* opcode */
     env->trap_arg2 = (insn >> 21) & 31;         /* dest regno */
+}
+
+#ifdef CONFIG_USER_ONLY
+void alpha_cpu_record_sigbus(CPUState *cs, vaddr addr,
+                             MMUAccessType access_type, uintptr_t retaddr)
+{
+    AlphaCPU *cpu = ALPHA_CPU(cs);
+    CPUAlphaState *env = &cpu->env;
+
+    do_unaligned_access(env, addr, retaddr);
+}
+#else
+void alpha_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
+                                   MMUAccessType access_type,
+                                   int mmu_idx, uintptr_t retaddr)
+{
+    AlphaCPU *cpu = ALPHA_CPU(cs);
+    CPUAlphaState *env = &cpu->env;
+
+    do_unaligned_access(env, addr, retaddr);
     cs->exception_index = EXCP_UNALIGN;
     env->error_code = 0;
     cpu_loop_exit(cs);