target/i386: Create cur_insn_len, cur_insn_len_i32

Create common routines for computing the length of the insn.
Use tcg_constant_i32 in the new function, while we're at it.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221001140935.465607-12-richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 19 insertions, 12 deletions

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index 6b16c0b..fe99c43 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -530,6 +530,16 @@ static void gen_update_eip_next(DisasContext *s)
     gen_jmp_im(s, s->pc - s->cs_base);
 }
 
+static int cur_insn_len(DisasContext *s)
+{
+    return s->pc - s->base.pc_next;
+}
+
+static TCGv_i32 cur_insn_len_i32(DisasContext *s)
+{
+    return tcg_constant_i32(cur_insn_len(s));
+}
+
 /* Compute SEG:REG into A0.  SEG is selected from the override segment
    (OVR_SEG) and the default segment (DEF_SEG).  OVR_SEG may be -1 to
    indicate no override.  */
@@ -712,9 +722,6 @@ static bool gen_check_io(DisasContext *s, MemOp ot, TCGv_i32 port,
         gen_helper_check_io(cpu_env, port, tcg_constant_i32(1 << ot));
     }
     if (GUEST(s)) {
-        target_ulong cur_eip = s->base.pc_next - s->cs_base;
-        target_ulong next_eip = s->pc - s->cs_base;
-
         gen_update_cc_op(s);
         gen_update_eip_cur(s);
         if (s->prefix & (PREFIX_REPZ | PREFIX_REPNZ)) {
@@ -723,7 +730,7 @@ static bool gen_check_io(DisasContext *s, MemOp ot, TCGv_i32 port,
         svm_flags |= 1 << (SVM_IOIO_SIZE_SHIFT + ot);
         gen_helper_svm_check_io(cpu_env, port,
                                 tcg_constant_i32(svm_flags),
-                                tcg_constant_i32(next_eip - cur_eip));
+                                cur_insn_len_i32(s));
     }
     return true;
 #endif
@@ -2028,7 +2035,7 @@ static uint64_t advance_pc(CPUX86State *env, DisasContext *s, int num_bytes)
     }
 
     s->pc += num_bytes;
-    if (unlikely(s->pc - s->base.pc_next > X86_MAX_INSN_LENGTH)) {
+    if (unlikely(cur_insn_len(s) > X86_MAX_INSN_LENGTH)) {
         /* If the instruction's 16th byte is on a different page than the 1st, a
          * page fault on the second page wins over the general protection fault
          * caused by the instruction being too long.
@@ -2647,7 +2654,7 @@ static void gen_interrupt(DisasContext *s, int intno)
     gen_update_cc_op(s);
     gen_update_eip_cur(s);
     gen_helper_raise_interrupt(cpu_env, tcg_constant_i32(intno),
-                               tcg_constant_i32(s->pc - s->base.pc_next));
+                               cur_insn_len_i32(s));
     s->base.is_jmp = DISAS_NORETURN;
 }
 
@@ -7314,7 +7321,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         if (prefixes & PREFIX_REPZ) {
             gen_update_cc_op(s);
             gen_update_eip_cur(s);
-            gen_helper_pause(cpu_env, tcg_const_i32(s->pc - s->base.pc_next));
+            gen_helper_pause(cpu_env, cur_insn_len_i32(s));
             s->base.is_jmp = DISAS_NORETURN;
         }
         break;
@@ -7340,7 +7347,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
             goto illegal_op;
         gen_update_cc_op(s);
         gen_update_eip_cur(s);
-        gen_helper_into(cpu_env, tcg_const_i32(s->pc - s->base.pc_next));
+        gen_helper_into(cpu_env, cur_insn_len_i32(s));
         break;
 #ifdef WANT_ICEBP
     case 0xf1: /* icebp (undocumented, exits to external debugger) */
@@ -7499,7 +7506,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         /* XXX: is it usable in real mode ? */
         gen_update_cc_op(s);
         gen_update_eip_cur(s);
-        gen_helper_syscall(cpu_env, tcg_const_i32(s->pc - s->base.pc_next));
+        gen_helper_syscall(cpu_env, cur_insn_len_i32(s));
         /* TF handling for the syscall insn is different. The TF bit is  checked
            after the syscall insn completes. This allows #DB to not be
            generated after one has entered CPL0 if TF is set in FMASK.  */
@@ -7531,7 +7538,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         if (check_cpl0(s)) {
             gen_update_cc_op(s);
             gen_update_eip_cur(s);
-            gen_helper_hlt(cpu_env, tcg_const_i32(s->pc - s->base.pc_next));
+            gen_helper_hlt(cpu_env, cur_insn_len_i32(s));
             s->base.is_jmp = DISAS_NORETURN;
         }
         break;
@@ -7640,7 +7647,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
             }
             gen_update_cc_op(s);
             gen_update_eip_cur(s);
-            gen_helper_mwait(cpu_env, tcg_const_i32(s->pc - s->base.pc_next));
+            gen_helper_mwait(cpu_env, cur_insn_len_i32(s));
             s->base.is_jmp = DISAS_NORETURN;
             break;
 
@@ -7716,7 +7723,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
             gen_update_cc_op(s);
             gen_update_eip_cur(s);
             gen_helper_vmrun(cpu_env, tcg_const_i32(s->aflag - 1),
-                             tcg_const_i32(s->pc - s->base.pc_next));
+                             cur_insn_len_i32(s));
             tcg_gen_exit_tb(NULL, 0);
             s->base.is_jmp = DISAS_NORETURN;
             break;