[PATCH v5 09/19] target/loongarch: Truncate high 32 bits of address in VA32 mode

[Philippe Mathieu-Daudé]

From: Jiajie Chen <c@jia.je>

When running in VA32 mode(!LA64 or VA32L[1-3] matching PLV), virtual
address is truncated to 32 bits before address mapping.

Signed-off-by: Jiajie Chen <c@jia.je>
Co-authored-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230822032724.1353391-6-gaosong@loongson.cn>
---
 target/loongarch/cpu.h       |  6 +++++-
 target/loongarch/translate.c | 16 +++++++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index e1562695e8..25a0ef7e41 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -445,7 +445,11 @@ static inline bool is_va32(CPULoongArchState *env)
 
 static inline void set_pc(CPULoongArchState *env, uint64_t value)
 {
-    env->pc = value;
+    if (is_va32(env)) {
+        env->pc = (uint32_t)value;
+    } else {
+        env->pc = value;
+    }
 }
 
 /*
diff --git a/target/loongarch/translate.c b/target/loongarch/translate.c
index 8b26555a27..9a23ec786d 100644
--- a/target/loongarch/translate.c
+++ b/target/loongarch/translate.c
@@ -86,6 +86,10 @@ void generate_exception(DisasContext *ctx, int excp)
 
 static inline void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest)
 {
+    if (ctx->va32) {
+        dest = (uint32_t) dest;
+    }
+
     if (translator_use_goto_tb(&ctx->base, dest)) {
         tcg_gen_goto_tb(n);
         tcg_gen_movi_tl(cpu_pc, dest);
@@ -212,11 +216,17 @@ static TCGv make_address_x(DisasContext *ctx, TCGv base, 
TCGv addend)
 {
     TCGv temp = NULL;
 
-    if (addend) {
+    if (addend || ctx->va32) {
         temp = tcg_temp_new();
+    }
+    if (addend) {
         tcg_gen_add_tl(temp, base, addend);
         base = temp;
     }
+    if (ctx->va32) {
+        tcg_gen_ext32u_tl(temp, base);
+        base = temp;
+    }
     return base;
 }
 
@@ -262,6 +272,10 @@ static void loongarch_tr_translate_insn(DisasContextBase 
*dcbase, CPUState *cs)
     }
 
     ctx->base.pc_next += 4;
+
+    if (ctx->va32) {
+        ctx->base.pc_next = (uint32_t)ctx->base.pc_next;
+    }
 }
 
 static void loongarch_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
-- 
2.41.0