[RFC v2 4/6] target/mips: Add native library calls

[Yeqi Fu]

Signed-off-by: Yeqi Fu <fufuyqqqqqq@gmail.com>
---
 target/mips/helper.h            |  6 ++++
 target/mips/tcg/meson.build     |  1 +
 target/mips/tcg/native_helper.c | 55 +++++++++++++++++++++++++++++++++
 target/mips/tcg/translate.c     | 20 +++++++++++-
 target/mips/tcg/translate.h     | 12 +++++++
 5 files changed, 93 insertions(+), 1 deletion(-)
 create mode 100644 target/mips/tcg/native_helper.c

diff --git a/target/mips/helper.h b/target/mips/helper.h
index de32d82e98..9fa949d78c 100644
--- a/target/mips/helper.h
+++ b/target/mips/helper.h
@@ -589,6 +589,12 @@ DEF_HELPER_FLAGS_3(dmthlip, 0, void, tl, tl, env)
 DEF_HELPER_FLAGS_3(wrdsp, 0, void, tl, tl, env)
 DEF_HELPER_FLAGS_2(rddsp, 0, tl, tl, env)
 
+#if defined(CONFIG_USER_ONLY)  && defined(CONFIG_USER_NATIVE_CALL)
+DEF_HELPER_1(native_memcpy, void, env)
+DEF_HELPER_1(native_memcmp, void, env)
+DEF_HELPER_1(native_memset, void, env)
+#endif
+
 #ifndef CONFIG_USER_ONLY
 #include "tcg/sysemu_helper.h.inc"
 #endif /* !CONFIG_USER_ONLY */
diff --git a/target/mips/tcg/meson.build b/target/mips/tcg/meson.build
index 7ee969ec8f..fb1ea64047 100644
--- a/target/mips/tcg/meson.build
+++ b/target/mips/tcg/meson.build
@@ -22,6 +22,7 @@ mips_ss.add(files(
   'txx9_translate.c',
   'vr54xx_helper.c',
   'vr54xx_translate.c',
+  'native_helper.c',
 ))
 mips_ss.add(when: 'TARGET_MIPS64', if_true: files(
   'tx79_translate.c',
diff --git a/target/mips/tcg/native_helper.c b/target/mips/tcg/native_helper.c
new file mode 100644
index 0000000000..bfd9c92e17
--- /dev/null
+++ b/target/mips/tcg/native_helper.c
@@ -0,0 +1,55 @@
+/*
+ *  native function call helpers
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/helper-proto.h"
+#include "exec/exec-all.h"
+#include "exec/cpu_ldst.h"
+
+#if defined(CONFIG_USER_ONLY)  && defined(CONFIG_USER_NATIVE_CALL)
+
+#define NATIVE_FN_W_3W()                   \
+    target_ulong arg0, arg1, arg2;         \
+    arg0 = env->active_tc.gpr[4]; /*"a0"*/ \
+    arg1 = env->active_tc.gpr[5]; /*"a1"*/ \
+    arg2 = env->active_tc.gpr[6]; /*"a2"*/
+
+void helper_native_memcpy(CPUMIPSState *env)
+{
+    CPUState *cs = env_cpu(env);
+    NATIVE_FN_W_3W();
+    void *ret;
+    void *dest = g2h(cs, arg0);
+    void *src = g2h(cs, arg1);
+    size_t n = (size_t)arg2;
+    ret = memcpy(dest, src, n);
+    env->active_tc.gpr[2] = (target_ulong)h2g(ret);
+}
+
+void helper_native_memcmp(CPUMIPSState *env)
+{
+    CPUState *cs = env_cpu(env);
+    NATIVE_FN_W_3W();
+    int ret;
+    void *s1 = g2h(cs, arg0);
+    void *s2 = g2h(cs, arg1);
+    size_t n = (size_t)arg2;
+    ret = memcmp(s1, s2, n);
+    env->active_tc.gpr[2] = ret;
+}
+
+void helper_native_memset(CPUMIPSState *env)
+{
+    CPUState *cs = env_cpu(env);
+    NATIVE_FN_W_3W();
+    void *ret;
+    void *s = g2h(cs, arg0);
+    int c = (int)arg1;
+    size_t n = (size_t)arg2;
+    ret = memset(s, c, n);
+    env->active_tc.gpr[2] = (target_ulong)h2g(ret);
+}
+
+#endif
diff --git a/target/mips/tcg/translate.c b/target/mips/tcg/translate.c
index a6ca2e5a3b..d68ce6bc2f 100644
--- a/target/mips/tcg/translate.c
+++ b/target/mips/tcg/translate.c
@@ -36,6 +36,7 @@
 #include "qemu/qemu-print.h"
 #include "fpu_helper.h"
 #include "translate.h"
+#include "native/native-func.h"
 
 /*
  * Many sysemu-only helpers are not reachable for user-only.
@@ -13591,7 +13592,24 @@ static void decode_opc_special(CPUMIPSState *env, 
DisasContext *ctx)
         gen_helper_pmon(cpu_env, tcg_constant_i32(sa));
 #endif
         break;
-    case OPC_SYSCALL:
+    case OPC_SYSCALL:  /* 00 00 00 0C */
+        if (native_bypass() && ((((ctx->opcode) >> 24) & 0xff) == 0x1)) {
+            uint16_t sig =  (ctx->opcode) >> 8 & 0xffff;
+            switch (sig) {
+            case NATIVE_MEMCPY:
+                gen_helper_native_memcpy(cpu_env);
+                break;
+            case NATIVE_MEMSET:
+                gen_helper_native_memset(cpu_env);
+                break;
+            case NATIVE_MEMCMP:
+                gen_helper_native_memcmp(cpu_env);
+                break;
+            default:
+                gen_reserved_instruction(ctx);
+            }
+            break;
+        }
         generate_exception_end(ctx, EXCP_SYSCALL);
         break;
     case OPC_BREAK:
diff --git a/target/mips/tcg/translate.h b/target/mips/tcg/translate.h
index 69f85841d2..f0112d88aa 100644
--- a/target/mips/tcg/translate.h
+++ b/target/mips/tcg/translate.h
@@ -237,3 +237,15 @@ static inline bool cpu_is_bigendian(DisasContext *ctx)
 }
 
 #endif
+
+/*
+ * Check if the native bypass feature is enabled.
+ */
+static inline bool native_bypass(void)
+{
+#if defined(CONFIG_USER_ONLY) && defined(CONFIG_USER_NATIVE_CALL)
+    return true;
+#else
+    return false;
+#endif
+}
-- 
2.34.1