From: Martin Kröning <martin.kroening@eonerc.rwth-aachen.de>

These functions are needed to support semihosting on CPUs that support
runtime-configurable endianness. They should not be used in other contexts.

Signed-off-by: Martin Kröning <martin.kroening@eonerc.rwth-aachen.de>
Message-id: 20260311-semihosting-cpu-tswap-v3-2-8e239575ec08@eonerc.rwth-aachen.de
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/exec/tswap.h | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/include/exec/tswap.h b/include/exec/tswap.h
index 9e94fa0021..17ac544454 100644
--- a/include/exec/tswap.h
+++ b/include/exec/tswap.h
@@ -10,6 +10,7 @@
 
 #include "qemu/bswap.h"
 #include "qemu/target-info.h"
+#include "hw/core/cpu.h"
 
 /*
  * If we're in target-specific code, we can hard-code the swapping
@@ -72,4 +73,39 @@ static inline void tswap64s(uint64_t *s)
 }
 #endif
 
+/*
+ * If we're in semihosting code, have to swap depending on the currently
+ * configured endianness of the CPU. These functions should not be used in
+ * other contexts.
+ */
+#define cpu_internal_needs_bswap(cpu) \
+    (HOST_BIG_ENDIAN != cpu_internal_is_big_endian(cpu))
+
+static inline uint16_t cpu_internal_tswap16(CPUState *cpu, uint16_t s)
+{
+    if (cpu_internal_needs_bswap(cpu)) {
+        return bswap16(s);
+    } else {
+        return s;
+    }
+}
+
+static inline uint32_t cpu_internal_tswap32(CPUState *cpu, uint32_t s)
+{
+    if (cpu_internal_needs_bswap(cpu)) {
+        return bswap32(s);
+    } else {
+        return s;
+    }
+}
+
+static inline uint64_t cpu_internal_tswap64(CPUState *cpu, uint64_t s)
+{
+    if (cpu_internal_needs_bswap(cpu)) {
+        return bswap64(s);
+    } else {
+        return s;
+    }
+}
+
 #endif  /* TSWAP_H */
-- 
2.43.0