target/loongarch: add check for fcond

fcond only has 22 types, add a check for fcond.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2972

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250603024810.350510-1-gaosong@loongson.cn>

2 files changed, 30 insertions, 11 deletions

diff --git a/target/loongarch/tcg/insn_trans/trans_fcmp.c.inc b/target/loongarch/tcg/insn_trans/trans_fcmp.c.inc
index 3babf69..6a2c030 100644
--- a/target/loongarch/tcg/insn_trans/trans_fcmp.c.inc
+++ b/target/loongarch/tcg/insn_trans/trans_fcmp.c.inc
@@ -4,10 +4,15 @@
  */
 
 /* bit0(signaling/quiet) bit1(lt) bit2(eq) bit3(un) bit4(neq) */
-static uint32_t get_fcmp_flags(int cond)
+static uint32_t get_fcmp_flags(DisasContext *ctx, int cond)
 {
     uint32_t flags = 0;
 
+    /*check cond , cond =[0-8,10,12] */
+    if ((cond > 8) &&(cond != 10) && (cond != 12)) {
+        return -1;
+    }
+
     if (cond & 0x1) {
         flags |= FCMP_LT;
     }
@@ -26,9 +31,14 @@ static uint32_t get_fcmp_flags(int cond)
 static bool trans_fcmp_cond_s(DisasContext *ctx, arg_fcmp_cond_s *a)
 {
     TCGv var, src1, src2;
-    uint32_t flags;
+    uint32_t flags = get_fcmp_flags(ctx, a->fcond >>1);
     void (*fn)(TCGv, TCGv_env, TCGv, TCGv, TCGv_i32);
 
+    if (flags == -1) {
+        generate_exception(ctx, EXCCODE_INE);
+        return true;
+    }
+
     if (!avail_FP_SP(ctx)) {
         return false;
     }
@@ -39,8 +49,6 @@ static bool trans_fcmp_cond_s(DisasContext *ctx, arg_fcmp_cond_s *a)
     src1 = get_fpr(ctx, a->fj);
     src2 = get_fpr(ctx, a->fk);
     fn = (a->fcond & 1 ? gen_helper_fcmp_s_s : gen_helper_fcmp_c_s);
-    flags = get_fcmp_flags(a->fcond >> 1);
-
     fn(var, tcg_env, src1, src2, tcg_constant_i32(flags));
 
     tcg_gen_st8_tl(var, tcg_env, offsetof(CPULoongArchState, cf[a->cd]));
@@ -50,9 +58,14 @@ static bool trans_fcmp_cond_s(DisasContext *ctx, arg_fcmp_cond_s *a)
 static bool trans_fcmp_cond_d(DisasContext *ctx, arg_fcmp_cond_d *a)
 {
     TCGv var, src1, src2;
-    uint32_t flags;
+    uint32_t flags = get_fcmp_flags(ctx, a->fcond >> 1);
     void (*fn)(TCGv, TCGv_env, TCGv, TCGv, TCGv_i32);
 
+    if (flags == -1) {
+        generate_exception(ctx, EXCCODE_INE);
+        return true;
+    }
+
     if (!avail_FP_DP(ctx)) {
         return false;
     }
@@ -63,8 +76,6 @@ static bool trans_fcmp_cond_d(DisasContext *ctx, arg_fcmp_cond_d *a)
     src1 = get_fpr(ctx, a->fj);
     src2 = get_fpr(ctx, a->fk);
     fn = (a->fcond & 1 ? gen_helper_fcmp_s_d : gen_helper_fcmp_c_d);
-    flags = get_fcmp_flags(a->fcond >> 1);
-
     fn(var, tcg_env, src1, src2, tcg_constant_i32(flags));
 
     tcg_gen_st8_tl(var, tcg_env, offsetof(CPULoongArchState, cf[a->cd]));
diff --git a/target/loongarch/tcg/insn_trans/trans_vec.c.inc b/target/loongarch/tcg/insn_trans/trans_vec.c.inc
index dff9277..d6f0560 100644
--- a/target/loongarch/tcg/insn_trans/trans_vec.c.inc
+++ b/target/loongarch/tcg/insn_trans/trans_vec.c.inc
@@ -4655,19 +4655,23 @@ TRANS(xvslti_du, LASX, do_xcmpi, MO_64, TCG_COND_LTU)
 
 static bool do_vfcmp_cond_s(DisasContext *ctx, arg_vvv_fcond *a, uint32_t sz)
 {
-    uint32_t flags;
+    uint32_t flags = get_fcmp_flags(ctx, a->fcond >> 1);
     void (*fn)(TCGv_env, TCGv_i32, TCGv_i32, TCGv_i32, TCGv_i32, TCGv_i32);
     TCGv_i32 vd = tcg_constant_i32(a->vd);
     TCGv_i32 vj = tcg_constant_i32(a->vj);
     TCGv_i32 vk = tcg_constant_i32(a->vk);
     TCGv_i32 oprsz = tcg_constant_i32(sz);
 
+    if(flags == -1){
+        generate_exception(ctx, EXCCODE_INE);
+        return true;
+    }
+
     if (!check_vec(ctx, sz)) {
         return true;
     }
 
     fn = (a->fcond & 1 ? gen_helper_vfcmp_s_s : gen_helper_vfcmp_c_s);
-    flags = get_fcmp_flags(a->fcond >> 1);
     fn(tcg_env, oprsz, vd, vj, vk, tcg_constant_i32(flags));
 
     return true;
@@ -4675,19 +4679,23 @@ static bool do_vfcmp_cond_s(DisasContext *ctx, arg_vvv_fcond *a, uint32_t sz)
 
 static bool do_vfcmp_cond_d(DisasContext *ctx, arg_vvv_fcond *a, uint32_t sz)
 {
-    uint32_t flags;
+    uint32_t flags = get_fcmp_flags(ctx, a->fcond >> 1);
     void (*fn)(TCGv_env, TCGv_i32, TCGv_i32, TCGv_i32, TCGv_i32, TCGv_i32);
     TCGv_i32 vd = tcg_constant_i32(a->vd);
     TCGv_i32 vj = tcg_constant_i32(a->vj);
     TCGv_i32 vk = tcg_constant_i32(a->vk);
     TCGv_i32 oprsz = tcg_constant_i32(sz);
 
+    if (flags == -1) {
+        generate_exception(ctx, EXCCODE_INE);
+        return true;
+    }
+
     if (!check_vec(ctx, sz)) {
         return true;
     }
 
     fn = (a->fcond & 1 ? gen_helper_vfcmp_s_d : gen_helper_vfcmp_c_d);
-    flags = get_fcmp_flags(a->fcond >> 1);
     fn(tcg_env, oprsz, vd, vj, vk, tcg_constant_i32(flags));
 
     return true;