qemu/target-info: Add target_endian_mode()

target_endian_mode() returns the default endianness (QAPI type)
of a target.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250708215320.70426-5-philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

include/qemu/target-info-impl.h

@@ -22,6 +22,8 @@ typedef struct TargetInfo {
     const char *cpu_type;
     /* QOM typename machines for this binary must implement */
     const char *machine_typename;
+    /* related to TARGET_BIG_ENDIAN definition */
+    EndianMode endianness;
 } TargetInfo;
 
 /**

include/qemu/target-info-qapi.h

@@ -9,6 +9,7 @@
 #ifndef QEMU_TARGET_INFO_EXTRA_H
 #define QEMU_TARGET_INFO_EXTRA_H
 
+#include "qapi/qapi-types-common.h"
 #include "qapi/qapi-types-machine.h"
 
 /**
@@ -18,4 +19,11 @@
  */
 SysEmuTarget target_arch(void);
 
+/**
+ * target_endian_mode:
+ *
+ * Returns: QAPI EndianMode enum (e.g. ENDIAN_MODE_LITTLE).
+ */
+EndianMode target_endian_mode(void);
+
 #endif

target-info-stub.c

@@ -18,6 +18,7 @@ static const TargetInfo target_info_stub = {
     .long_bits = TARGET_LONG_BITS,
     .cpu_type = CPU_RESOLVING_TYPE,
     .machine_typename = TYPE_MACHINE,
+    .endianness = TARGET_BIG_ENDIAN ? ENDIAN_MODE_BIG : ENDIAN_MODE_LITTLE,
 };
 
 const TargetInfo *target_info(void)

target-info.c

@@ -42,3 +42,8 @@ const char *target_machine_typename(void)
 {
     return target_info()->machine_typename;
 }
+
+EndianMode target_endian_mode(void)
+{
+    return target_info()->endianness;
+}