target/i386: Pass in port to gen_check_io

Pass in a pre-truncated TCGv_i32 value.  We were doing the
truncation of EDX in multiple places, now only once per insn.
While all callers use s->tmp2_i32, for cleanliness of the
subroutine, use a parameter anyway.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-48-richard.henderson@linaro.org>

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index 2282c35..94193a8 100644 (file)
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -674,19 +674,23 @@ static void gen_helper_out_func(MemOp ot, TCGv_i32 v, TCGv_i32 n)
     }
 }
 
-static bool gen_check_io(DisasContext *s, MemOp ot, uint32_t svm_flags)
+/*
+ * Validate that access to [port, port + 1<<ot) is allowed.
+ * Raise #GP, or VMM exit if not.
+ */
+static bool gen_check_io(DisasContext *s, MemOp ot, TCGv_i32 port,
+                         uint32_t svm_flags)
 {
-    tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
     if (PE(s) && (CPL(s) > IOPL(s) || VM86(s))) {
         switch (ot) {
         case MO_8:
-            gen_helper_check_iob(cpu_env, s->tmp2_i32);
+            gen_helper_check_iob(cpu_env, port);
             break;
         case MO_16:
-            gen_helper_check_iow(cpu_env, s->tmp2_i32);
+            gen_helper_check_iow(cpu_env, port);
             break;
         case MO_32:
-            gen_helper_check_iol(cpu_env, s->tmp2_i32);
+            gen_helper_check_iol(cpu_env, port);
             break;
         default:
             tcg_abort();
@@ -702,7 +706,7 @@ static bool gen_check_io(DisasContext *s, MemOp ot, uint32_t svm_flags)
             svm_flags |= SVM_IOIO_REP_MASK;
         }
         svm_flags |= 1 << (SVM_IOIO_SIZE_SHIFT + ot);
-        gen_helper_svm_check_io(cpu_env, s->tmp2_i32,
+        gen_helper_svm_check_io(cpu_env, port,
                                 tcg_constant_i32(svm_flags),
                                 tcg_constant_i32(next_eip - cur_eip));
     }
@@ -6479,8 +6483,10 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
     case 0x6c: /* insS */
     case 0x6d:
         ot = mo_b_d32(b, dflag);
-        tcg_gen_ext16u_tl(s->T0, cpu_regs[R_EDX]);
-        if (!gen_check_io(s, ot, SVM_IOIO_TYPE_MASK | SVM_IOIO_STR_MASK)) {
+        tcg_gen_trunc_tl_i32(s->tmp2_i32, cpu_regs[R_EDX]);
+        tcg_gen_ext16u_i32(s->tmp2_i32, s->tmp2_i32);
+        if (!gen_check_io(s, ot, s->tmp2_i32,
+                          SVM_IOIO_TYPE_MASK | SVM_IOIO_STR_MASK)) {
             break;
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
@@ -6499,8 +6505,9 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
     case 0x6e: /* outsS */
     case 0x6f:
         ot = mo_b_d32(b, dflag);
-        tcg_gen_ext16u_tl(s->T0, cpu_regs[R_EDX]);
-        if (!gen_check_io(s, ot, SVM_IOIO_STR_MASK)) {
+        tcg_gen_trunc_tl_i32(s->tmp2_i32, cpu_regs[R_EDX]);
+        tcg_gen_ext16u_i32(s->tmp2_i32, s->tmp2_i32);
+        if (!gen_check_io(s, ot, s->tmp2_i32, SVM_IOIO_STR_MASK)) {
             break;
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
@@ -6524,14 +6531,13 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
     case 0xe5:
         ot = mo_b_d32(b, dflag);
         val = x86_ldub_code(env, s);
-        tcg_gen_movi_tl(s->T0, val);
-        if (!gen_check_io(s, ot, SVM_IOIO_TYPE_MASK)) {
+        tcg_gen_movi_i32(s->tmp2_i32, val);
+        if (!gen_check_io(s, ot, s->tmp2_i32, SVM_IOIO_TYPE_MASK)) {
             break;
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
         }
-        tcg_gen_movi_i32(s->tmp2_i32, val);
         gen_helper_in_func(ot, s->T1, s->tmp2_i32);
         gen_op_mov_reg_v(s, ot, R_EAX, s->T1);
         gen_bpt_io(s, s->tmp2_i32, ot);
@@ -6543,16 +6549,14 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
     case 0xe7:
         ot = mo_b_d32(b, dflag);
         val = x86_ldub_code(env, s);
-        tcg_gen_movi_tl(s->T0, val);
-        if (!gen_check_io(s, ot, 0)) {
+        tcg_gen_movi_i32(s->tmp2_i32, val);
+        if (!gen_check_io(s, ot, s->tmp2_i32, 0)) {
             break;
         }
-        gen_op_mov_v_reg(s, ot, s->T1, R_EAX);
-
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
         }
-        tcg_gen_movi_i32(s->tmp2_i32, val);
+        gen_op_mov_v_reg(s, ot, s->T1, R_EAX);
         tcg_gen_trunc_tl_i32(s->tmp3_i32, s->T1);
         gen_helper_out_func(ot, s->tmp2_i32, s->tmp3_i32);
         gen_bpt_io(s, s->tmp2_i32, ot);
@@ -6563,14 +6567,14 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
     case 0xec:
     case 0xed:
         ot = mo_b_d32(b, dflag);
-        tcg_gen_ext16u_tl(s->T0, cpu_regs[R_EDX]);
-        if (!gen_check_io(s, ot, SVM_IOIO_TYPE_MASK)) {
+        tcg_gen_trunc_tl_i32(s->tmp2_i32, cpu_regs[R_EDX]);
+        tcg_gen_ext16u_i32(s->tmp2_i32, s->tmp2_i32);
+        if (!gen_check_io(s, ot, s->tmp2_i32, SVM_IOIO_TYPE_MASK)) {
             break;
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
         }
-        tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
         gen_helper_in_func(ot, s->T1, s->tmp2_i32);
         gen_op_mov_reg_v(s, ot, R_EAX, s->T1);
         gen_bpt_io(s, s->tmp2_i32, ot);
@@ -6581,16 +6585,15 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
     case 0xee:
     case 0xef:
         ot = mo_b_d32(b, dflag);
-        tcg_gen_ext16u_tl(s->T0, cpu_regs[R_EDX]);
-        if (!gen_check_io(s, ot, 0)) {
+        tcg_gen_trunc_tl_i32(s->tmp2_i32, cpu_regs[R_EDX]);
+        tcg_gen_ext16u_i32(s->tmp2_i32, s->tmp2_i32);
+        if (!gen_check_io(s, ot, s->tmp2_i32, 0)) {
             break;
         }
-        gen_op_mov_v_reg(s, ot, s->T1, R_EAX);
-
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
         }
-        tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
+        gen_op_mov_v_reg(s, ot, s->T1, R_EAX);
         tcg_gen_trunc_tl_i32(s->tmp3_i32, s->T1);
         gen_helper_out_func(ot, s->tmp2_i32, s->tmp3_i32);
         gen_bpt_io(s, s->tmp2_i32, ot);