[PATCH v1 1/6] target/loongarch: Add env->extctx_flags for user-mode setup extcontext

[Song Gao]

extctx_flags only for user-mode,  and the default value is
EXTCTX_FLAGS_FPU, We only need save/restore fpu context,
After a LSX or LASX instruction is execed, the value change to
EXTCTX_FLAGS_LSX/LASX, and we need save/restore lsx/lasx
context. So if the binary no LSX/LASX instruction We only need
save/restore fpu context.

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 target/loongarch/cpu.c       | 2 ++
 target/loongarch/cpu.h       | 2 ++
 target/loongarch/internals.h | 2 ++
 target/loongarch/translate.c | 3 +++
 target/loongarch/translate.h | 1 +
 5 files changed, 10 insertions(+)

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index 2bea7ca5d5..32dd1b624b 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -546,6 +546,8 @@ static void loongarch_cpu_reset_hold(Object *obj)
     memset(env->tlb, 0, sizeof(env->tlb));
 #endif
 
+    env->extctx_flags = EXTCTX_FLAGS_FPU;
+
     restore_fp_status(env);
     cs->exception_index = -1;
 }
diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index 40e70a8119..7a94963e5f 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -295,6 +295,8 @@ typedef struct CPUArchState {
     uint64_t lladdr; /* LL virtual address compared against SC */
     uint64_t llval;
 
+    uint64_t extctx_flags; /* Use for user-mode setup extcontext */
+
     /* LoongArch CSRs */
     uint64_t CSR_CRMD;
     uint64_t CSR_PRMD;
diff --git a/target/loongarch/internals.h b/target/loongarch/internals.h
index c492863cc5..01d98ac2fc 100644
--- a/target/loongarch/internals.h
+++ b/target/loongarch/internals.h
@@ -21,6 +21,8 @@
 /* Global bit for huge page */
 #define LOONGARCH_HGLOBAL_SHIFT     12
 
+#define EXTCTX_FLAGS_FPU  0b01
+
 void loongarch_translate_init(void);
 
 void loongarch_cpu_dump_state(CPUState *cpu, FILE *f, int flags);
diff --git a/target/loongarch/translate.c b/target/loongarch/translate.c
index 21f4db6fbd..9b82295542 100644
--- a/target/loongarch/translate.c
+++ b/target/loongarch/translate.c
@@ -147,6 +147,8 @@ static void 
loongarch_tr_init_disas_context(DisasContextBase *dcbase,
 
     ctx->cpucfg1 = env->cpucfg[1];
     ctx->cpucfg2 = env->cpucfg[2];
+
+    ctx->extctx_flags = env->extctx_flags;
 }
 
 static void loongarch_tr_tb_start(DisasContextBase *dcbase, CPUState *cs)
@@ -294,6 +296,7 @@ static void loongarch_tr_translate_insn(DisasContextBase 
*dcbase, CPUState *cs)
         generate_exception(ctx, EXCCODE_INE);
     }
 
+    env->extctx_flags |= ctx->extctx_flags;
     ctx->base.pc_next += 4;
 
     if (ctx->va32) {
diff --git a/target/loongarch/translate.h b/target/loongarch/translate.h
index 195f53573a..3bf1a1df86 100644
--- a/target/loongarch/translate.h
+++ b/target/loongarch/translate.h
@@ -40,6 +40,7 @@ typedef enum {
 typedef struct DisasContext {
     DisasContextBase base;
     target_ulong page_start;
+    uint64_t extctx_flags;
     uint32_t opcode;
     uint16_t mem_idx;
     uint16_t plv;
-- 
2.25.1