target/arm: Introduce pc_curr

Add a new field to retain the address of the instruction currently
being translated.  The 32-bit uses are all within subroutines used
by a32 and t32.  This will become less obvious when t16 support is
merged with a32+t32, and having a clear definition will help.

Convert aarch64 as well for consistency.  Note that there is one
instance of a pre-assert fprintf that used the wrong value for the
address of the current instruction.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190807045335.1361-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 11 insertions, 10 deletions

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 90850ea..a0b557d 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -1234,7 +1234,7 @@ static inline AArch64DecodeFn *lookup_disas_fn(const AArch64DecodeTable *table,
  */
 static void disas_uncond_b_imm(DisasContext *s, uint32_t insn)
 {
-    uint64_t addr = s->pc + sextract32(insn, 0, 26) * 4 - 4;
+    uint64_t addr = s->pc_curr + sextract32(insn, 0, 26) * 4;
 
     if (insn & (1U << 31)) {
         /* BL Branch with link */
@@ -1262,7 +1262,7 @@ static void disas_comp_b_imm(DisasContext *s, uint32_t insn)
     sf = extract32(insn, 31, 1);
     op = extract32(insn, 24, 1); /* 0: CBZ; 1: CBNZ */
     rt = extract32(insn, 0, 5);
-    addr = s->pc + sextract32(insn, 5, 19) * 4 - 4;
+    addr = s->pc_curr + sextract32(insn, 5, 19) * 4;
 
     tcg_cmp = read_cpu_reg(s, rt, sf);
     label_match = gen_new_label();
@@ -1291,7 +1291,7 @@ static void disas_test_b_imm(DisasContext *s, uint32_t insn)
 
     bit_pos = (extract32(insn, 31, 1) << 5) | extract32(insn, 19, 5);
     op = extract32(insn, 24, 1); /* 0: TBZ; 1: TBNZ */
-    addr = s->pc + sextract32(insn, 5, 14) * 4 - 4;
+    addr = s->pc_curr + sextract32(insn, 5, 14) * 4;
     rt = extract32(insn, 0, 5);
 
     tcg_cmp = tcg_temp_new_i64();
@@ -1322,7 +1322,7 @@ static void disas_cond_b_imm(DisasContext *s, uint32_t insn)
         unallocated_encoding(s);
         return;
     }
-    addr = s->pc + sextract32(insn, 5, 19) * 4 - 4;
+    addr = s->pc_curr + sextract32(insn, 5, 19) * 4;
     cond = extract32(insn, 0, 4);
 
     reset_btype(s);
@@ -1706,7 +1706,7 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
         TCGv_i32 tcg_syn, tcg_isread;
         uint32_t syndrome;
 
-        gen_a64_set_pc_im(s->pc - 4);
+        gen_a64_set_pc_im(s->pc_curr);
         tmpptr = tcg_const_ptr(ri);
         syndrome = syn_aa64_sysregtrap(op0, op1, op2, crn, crm, rt, isread);
         tcg_syn = tcg_const_i32(syndrome);
@@ -1870,7 +1870,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
             /* The pre HVC helper handles cases when HVC gets trapped
              * as an undefined insn by runtime configuration.
              */
-            gen_a64_set_pc_im(s->pc - 4);
+            gen_a64_set_pc_im(s->pc_curr);
             gen_helper_pre_hvc(cpu_env);
             gen_ss_advance(s);
             gen_exception_insn(s, 0, EXCP_HVC, syn_aa64_hvc(imm16), 2);
@@ -1880,7 +1880,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
                 unallocated_encoding(s);
                 break;
             }
-            gen_a64_set_pc_im(s->pc - 4);
+            gen_a64_set_pc_im(s->pc_curr);
             tmp = tcg_const_i32(syn_aa64_smc(imm16));
             gen_helper_pre_smc(cpu_env, tmp);
             tcg_temp_free_i32(tmp);
@@ -2601,7 +2601,7 @@ static void disas_ld_lit(DisasContext *s, uint32_t insn)
 
     tcg_rt = cpu_reg(s, rt);
 
-    clean_addr = tcg_const_i64((s->pc - 4) + imm);
+    clean_addr = tcg_const_i64(s->pc_curr + imm);
     if (is_vector) {
         do_fp_ld(s, rt, clean_addr, size);
     } else {
@@ -3580,7 +3580,7 @@ static void disas_pc_rel_adr(DisasContext *s, uint32_t insn)
     offset = sextract64(insn, 5, 19);
     offset = offset << 2 | extract32(insn, 29, 2);
     rd = extract32(insn, 0, 5);
-    base = s->pc - 4;
+    base = s->pc_curr;
 
     if (page) {
         /* ADRP (page based) */
@@ -11519,7 +11519,7 @@ static void disas_simd_three_reg_same_fp16(DisasContext *s, uint32_t insn)
                 break;
             default:
                 fprintf(stderr, "%s: insn %#04x, fpop %#2x @ %#" PRIx64 "\n",
-                        __func__, insn, fpopcode, s->pc);
+                        __func__, insn, fpopcode, s->pc_curr);
                 g_assert_not_reached();
             }
 
@@ -14030,6 +14030,7 @@ static void disas_a64_insn(CPUARMState *env, DisasContext *s)
 {
     uint32_t insn;
 
+    s->pc_curr = s->pc;
     insn = arm_ldl_code(env, s->pc, s->sctlr_b);
     s->insn = insn;
     s->pc += 4;