[PATCH v2] linux-user: Fix strace output for s390x mmap()

[Ilya Leoshkevich <iii@linux.ibm.com>]

print_mmap() assumes that mmap() receives arguments via memory if
mmap2() is present. s390x (as opposed to s390) does not fit this
pattern: it does not have mmap2(), but mmap() still receives arguments
via memory.

Fix by sharing the detection logic between syscall.c and strace.c.

Cc: qemu-stable@nongnu.org
Fixes: d971040c2d16 ("linux-user: Fix strace output for old_mmap")
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---

v1: https://lore.kernel.org/qemu-devel/20241119211138.148806-1-iii@linux.ibm.com/
v1 -> v2: Share the detection logic between syscall.c and strace.c
          (Richard).

 linux-user/strace.c       | 2 +-
 linux-user/syscall.c      | 5 +----
 linux-user/syscall_defs.h | 7 +++++++
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/linux-user/strace.c b/linux-user/strace.c
index b70eadc19ef..9c55f39b095 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -3971,7 +3971,7 @@ print_mmap(CPUArchState *cpu_env, const struct syscallname *name,
 {
     return print_mmap_both(cpu_env, name, arg0, arg1, arg2, arg3,
                            arg4, arg5,
-#if defined(TARGET_NR_mmap2)
+#ifdef TARGET_ARCH_WANT_SYS_OLD_MMAP
                             true
 #else
                             false
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 0279f235768..1ce4c79784f 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -10588,10 +10588,7 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
         return ret;
 #ifdef TARGET_NR_mmap
     case TARGET_NR_mmap:
-#if (defined(TARGET_I386) && defined(TARGET_ABI32)) || \
-    (defined(TARGET_ARM) && defined(TARGET_ABI32)) || \
-    defined(TARGET_M68K) || defined(TARGET_MICROBLAZE) \
-    || defined(TARGET_S390X)
+#ifdef TARGET_ARCH_WANT_SYS_OLD_MMAP
         {
             abi_ulong *v;
             abi_ulong v1, v2, v3, v4, v5, v6;
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 0e08dfae3e4..faad9147c91 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -2766,4 +2766,11 @@ struct target_open_how_ver0 {
 #define RESOLVE_NO_SYMLINKS     0x04
 #endif
 
+#if (defined(TARGET_I386) && defined(TARGET_ABI32)) || \
+    (defined(TARGET_ARM) && defined(TARGET_ABI32)) || \
+    defined(TARGET_M68K) || defined(TARGET_MICROBLAZE) || \
+    defined(TARGET_S390X)
+#define TARGET_ARCH_WANT_SYS_OLD_MMAP
+#endif
+
 #endif
-- 
2.47.0