From: James Hilliard <james.hilliard1@gmail.com>
Date: Fri, 8 May 2026 07:13:45 +0000 (+0200)
Subject: linux-user/mips: implement sysmips(MIPS_FLUSH_CACHE)
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e83a42cbf72bf83eabb71d85be88df34c953b158;p=thirdparty%2Fqemu.git

linux-user/mips: implement sysmips(MIPS_FLUSH_CACHE)

Add the target sysmips dispatcher and implement MIPS_FLUSH_CACHE as a
successful no-op for linux-user.

Self-modifying code is handled by QEMU's normal user-mode translation
invalidation machinery, so the target ABI only needs the syscall command
to be accepted.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20260520172313.23777-2-philmd@linaro.org>
---

diff --git a/linux-user/mips/target_syscall.h b/linux-user/mips/target_syscall.h
index dfcdf320b7..3f36c1695a 100644
--- a/linux-user/mips/target_syscall.h
+++ b/linux-user/mips/target_syscall.h
@@ -10,6 +10,7 @@
 #define TARGET_MCL_ONFAULT 4
 
 #define TARGET_FORCE_SHMLBA
+#define TARGET_SYSMIPS_FLUSH_CACHE     3
 
 static inline abi_ulong target_shmlba(CPUMIPSState *env)
 {
diff --git a/linux-user/mips64/target_syscall.h b/linux-user/mips64/target_syscall.h
index 9135bf5e8b..20ea7c6ab9 100644
--- a/linux-user/mips64/target_syscall.h
+++ b/linux-user/mips64/target_syscall.h
@@ -10,6 +10,7 @@
 #define TARGET_MCL_ONFAULT 4
 
 #define TARGET_FORCE_SHMLBA
+#define TARGET_SYSMIPS_FLUSH_CACHE     3
 
 static inline abi_ulong target_shmlba(CPUMIPSState *env)
 {
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 2d4a8aa182..5a8e00337a 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6630,6 +6630,19 @@ static abi_long do_prctl_syscall_user_dispatch(CPUArchState *env,
     }
 }
 
+#ifdef TARGET_NR_sysmips
+static abi_long do_sysmips(CPUArchState *env, abi_long cmd, abi_long arg1,
+                           abi_long arg2)
+{
+    switch (cmd) {
+    case TARGET_SYSMIPS_FLUSH_CACHE:
+        return 0;
+    default:
+        return -TARGET_EINVAL;
+    }
+}
+#endif
+
 static abi_long do_prctl(CPUArchState *env, abi_long option, abi_long arg2,
                          abi_long arg3, abi_long arg4, abi_long arg5)
 {
@@ -12110,6 +12123,10 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
     case TARGET_NR_prctl:
         return do_prctl(cpu_env, arg1, arg2, arg3, arg4, arg5);
         break;
+#ifdef TARGET_NR_sysmips
+    case TARGET_NR_sysmips:
+        return do_sysmips(cpu_env, arg1, arg2, arg3);
+#endif
 #ifdef TARGET_NR_arch_prctl
     case TARGET_NR_arch_prctl:
         return do_arch_prctl(cpu_env, arg1, arg2);