[Qemu-devel] [PATCH 10/14] target-i386: Implement BNDCL, BNDCU, BNDCN

[Richard Henderson <rth@twiddle.net>]

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-i386/helper.h     |  2 ++
 target-i386/mpx_helper.c |  8 ++++++++
 target-i386/translate.c  | 46 +++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/target-i386/helper.h b/target-i386/helper.h
index 0c957bf..331457f 100644
--- a/target-i386/helper.h
+++ b/target-i386/helper.h
@@ -16,6 +16,8 @@ DEF_HELPER_2(divq_EAX, void, env, tl)
 DEF_HELPER_2(idivq_EAX, void, env, tl)
 #endif
 
+DEF_HELPER_FLAGS_2(bndck, TCG_CALL_NO_WG, void, env, i32)
+
 DEF_HELPER_2(aam, void, env, int)
 DEF_HELPER_2(aad, void, env, int)
 DEF_HELPER_1(aaa, void, env)
diff --git a/target-i386/mpx_helper.c b/target-i386/mpx_helper.c
index decb2ea..172a4d2 100644
--- a/target-i386/mpx_helper.c
+++ b/target-i386/mpx_helper.c
@@ -49,3 +49,11 @@ void cpu_sync_bndcs_hf(CPUX86State *env)
 
     env->hflags = hflags;
 }
+
+void helper_bndck(CPUX86State *env, uint32_t fail)
+{
+    if (unlikely(fail)) {
+        env->bndcs_regs.sts = 1;
+        raise_exception(env, EXCP05_BOUND);
+    }
+}
diff --git a/target-i386/translate.c b/target-i386/translate.c
index fcafa81..05796cc 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -1988,6 +1988,23 @@ static void gen_nop_modrm(CPUX86State *env, DisasContext *s, int modrm)
     (void)gen_lea_modrm_0(env, s, modrm);
 }
 
+/* Used for BNDCL, BNDCU, BNDCN.  */
+static void gen_bndck(CPUX86State *env, DisasContext *s, int modrm,
+                      TCGCond cond, TCGv_i64 bndv, target_ulong pc_start)
+{
+    TCGv ea = gen_lea_modrm_1(gen_lea_modrm_0(env, s, modrm));
+
+    tcg_gen_extu_tl_i64(cpu_tmp1_i64, ea);
+    if (!CODE64(s)) {
+        tcg_gen_ext32u_i64(cpu_tmp1_i64, cpu_tmp1_i64);
+    }
+    tcg_gen_setcond_i64(cond, cpu_tmp1_i64, cpu_tmp1_i64, bndv);
+    tcg_gen_trunc_i64_i32(cpu_tmp2_i32, cpu_tmp1_i64);
+    gen_update_cc_op(s);
+    gen_jmp_im(pc_start - s->cs_base);
+    gen_helper_bndck(cpu_env, cpu_tmp2_i32);
+}
+
 /* used for LEA and MOV AX, mem */
 static void gen_add_A0_ds_seg(DisasContext *s)
 {
@@ -7521,7 +7538,26 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
         if (s->flags & HF_MPX_EN_MASK) {
             mod = (modrm >> 6) & 3;
             reg = ((modrm >> 3) & 7) | rex_r;
-            if (prefixes & PREFIX_DATA) {
+            if (prefixes & PREFIX_REPZ) {
+                /* bndcl */
+                if (reg >= 4
+                    || (prefixes & PREFIX_LOCK)
+                    || s->aflag == MO_16) {
+                    goto illegal_op;
+                }
+                gen_bndck(env, s, modrm, TCG_COND_LTU, cpu_bndl[reg], pc_start);
+            } else if (prefixes & PREFIX_REPNZ) {
+                /* bndcu */
+                if (reg >= 4
+                    || (prefixes & PREFIX_LOCK)
+                    || s->aflag == MO_16) {
+                    goto illegal_op;
+                }
+                TCGv_i64 notu = tcg_temp_new_i64();
+                tcg_gen_not_i64(notu, cpu_bndu[reg]);
+                gen_bndck(env, s, modrm, TCG_COND_GTU, notu, pc_start);
+                tcg_temp_free_i64(notu);
+            } else if (prefixes & PREFIX_DATA) {
                 /* bndmov -- from reg/mem */
                 if (reg >= 4 || s->aflag == MO_16) {
                     goto illegal_op;
@@ -7587,6 +7623,14 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
                 /* bnd registers are now in-use */
                 gen_set_hflag(s, HF_MPX_IU_MASK);
                 break;
+            } else if (prefixes & PREFIX_REPNZ) {
+                /* bndcn */
+                if (reg >= 4
+                    || (prefixes & PREFIX_LOCK)
+                    || s->aflag == MO_16) {
+                    goto illegal_op;
+                }
+                gen_bndck(env, s, modrm, TCG_COND_GTU, cpu_bndu[reg], pc_start);
             } else if (prefixes & PREFIX_DATA) {
                 /* bndmov -- to reg/mem */
                 if (reg >= 4 || s->aflag == MO_16) {
-- 
2.4.3