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[PATCH v7 59/60] tcg: Add helper_unaligned_{ld, st} for user-only sigbus


From: Richard Henderson
Subject: [PATCH v7 59/60] tcg: Add helper_unaligned_{ld, st} for user-only sigbus
Date: Mon, 1 Nov 2021 13:27:28 -0400

To be called from tcg generated code on hosts that support
unaligned accesses natively, in response to an access that
is supposed to be aligned.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/tcg/tcg-ldst.h |  5 +++++
 accel/tcg/user-exec.c  | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/tcg/tcg-ldst.h b/include/tcg/tcg-ldst.h
index 8c86365611..bf40942de4 100644
--- a/include/tcg/tcg-ldst.h
+++ b/include/tcg/tcg-ldst.h
@@ -70,5 +70,10 @@ void helper_be_stl_mmu(CPUArchState *env, target_ulong addr, 
uint32_t val,
 void helper_be_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
                        MemOpIdx oi, uintptr_t retaddr);
 
+#else
+
+void QEMU_NORETURN helper_unaligned_ld(CPUArchState *env, target_ulong addr);
+void QEMU_NORETURN helper_unaligned_st(CPUArchState *env, target_ulong addr);
+
 #endif /* CONFIG_SOFTMMU */
 #endif /* TCG_LDST_H */
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index aaf47d89d2..1528a21fad 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -27,6 +27,7 @@
 #include "exec/helper-proto.h"
 #include "qemu/atomic128.h"
 #include "trace/trace-root.h"
+#include "tcg/tcg-ldst.h"
 #include "internal.h"
 
 __thread uintptr_t helper_retaddr;
@@ -215,6 +216,16 @@ static void validate_memop(MemOpIdx oi, MemOp expected)
 #endif
 }
 
+void helper_unaligned_ld(CPUArchState *env, target_ulong addr)
+{
+    cpu_loop_exit_sigbus(env_cpu(env), addr, MMU_DATA_LOAD, GETPC());
+}
+
+void helper_unaligned_st(CPUArchState *env, target_ulong addr)
+{
+    cpu_loop_exit_sigbus(env_cpu(env), addr, MMU_DATA_STORE, GETPC());
+}
+
 static void *cpu_mmu_lookup(CPUArchState *env, target_ulong addr,
                             MemOpIdx oi, uintptr_t ra, MMUAccessType type)
 {
-- 
2.25.1




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