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-rw-r--r--target/m68k/cpu.c2
-rw-r--r--target/m68k/cpu.h1
-rw-r--r--target/m68k/helper.h3
-rw-r--r--target/m68k/op_helper.c61
-rw-r--r--target/m68k/translate.c77
5 files changed, 143 insertions, 1 deletions
diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
index 0a3dd83..57ffcb2 100644
--- a/target/m68k/cpu.c
+++ b/target/m68k/cpu.c
@@ -134,6 +134,7 @@ static void m68020_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_CAS);
m68k_set_feature(env, M68K_FEATURE_BKPT);
m68k_set_feature(env, M68K_FEATURE_RTD);
+ m68k_set_feature(env, M68K_FEATURE_CHK2);
}
#define m68030_cpu_initfn m68020_cpu_initfn
#define m68040_cpu_initfn m68020_cpu_initfn
@@ -156,6 +157,7 @@ static void m68060_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_CAS);
m68k_set_feature(env, M68K_FEATURE_BKPT);
m68k_set_feature(env, M68K_FEATURE_RTD);
+ m68k_set_feature(env, M68K_FEATURE_CHK2);
}
static void m5208_cpu_initfn(Object *obj)
diff --git a/target/m68k/cpu.h b/target/m68k/cpu.h
index cd4b3a7..68396bd 100644
--- a/target/m68k/cpu.h
+++ b/target/m68k/cpu.h
@@ -305,6 +305,7 @@ enum m68k_features {
M68K_FEATURE_CAS,
M68K_FEATURE_BKPT,
M68K_FEATURE_RTD,
+ M68K_FEATURE_CHK2,
};
static inline int m68k_feature(CPUM68KState *env, int feature)
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index eebe52d..78483da 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -94,3 +94,6 @@ DEF_HELPER_FLAGS_4(bfchg_mem, TCG_CALL_NO_WG, i32, env, i32, s32, i32)
DEF_HELPER_FLAGS_4(bfclr_mem, TCG_CALL_NO_WG, i32, env, i32, s32, i32)
DEF_HELPER_FLAGS_4(bfset_mem, TCG_CALL_NO_WG, i32, env, i32, s32, i32)
DEF_HELPER_FLAGS_4(bfffo_mem, TCG_CALL_NO_WG, i64, env, i32, s32, i32)
+
+DEF_HELPER_3(chk, void, env, s32, s32)
+DEF_HELPER_4(chk2, void, env, s32, s32, s32)
diff --git a/target/m68k/op_helper.c b/target/m68k/op_helper.c
index 5c7b27b..7e97d03 100644
--- a/target/m68k/op_helper.c
+++ b/target/m68k/op_helper.c
@@ -947,3 +947,64 @@ uint64_t HELPER(bfffo_mem)(CPUM68KState *env, uint32_t addr,
is already zero. */
return n | ffo;
}
+
+void HELPER(chk)(CPUM68KState *env, int32_t val, int32_t ub)
+{
+ /* From the specs:
+ * X: Not affected, C,V,Z: Undefined,
+ * N: Set if val < 0; cleared if val > ub, undefined otherwise
+ * We implement here values found from a real MC68040:
+ * X,V,Z: Not affected
+ * N: Set if val < 0; cleared if val >= 0
+ * C: if 0 <= ub: set if val < 0 or val > ub, cleared otherwise
+ * if 0 > ub: set if val > ub and val < 0, cleared otherwise
+ */
+ env->cc_n = val;
+ env->cc_c = 0 <= ub ? val < 0 || val > ub : val > ub && val < 0;
+
+ if (val < 0 || val > ub) {
+ CPUState *cs = CPU(m68k_env_get_cpu(env));
+
+ /* Recover PC and CC_OP for the beginning of the insn. */
+ cpu_restore_state(cs, GETPC());
+
+ /* flags have been modified by gen_flush_flags() */
+ env->cc_op = CC_OP_FLAGS;
+ /* Adjust PC to end of the insn. */
+ env->pc += 2;
+
+ cs->exception_index = EXCP_CHK;
+ cpu_loop_exit(cs);
+ }
+}
+
+void HELPER(chk2)(CPUM68KState *env, int32_t val, int32_t lb, int32_t ub)
+{
+ /* From the specs:
+ * X: Not affected, N,V: Undefined,
+ * Z: Set if val is equal to lb or ub
+ * C: Set if val < lb or val > ub, cleared otherwise
+ * We implement here values found from a real MC68040:
+ * X,N,V: Not affected
+ * Z: Set if val is equal to lb or ub
+ * C: if lb <= ub: set if val < lb or val > ub, cleared otherwise
+ * if lb > ub: set if val > ub and val < lb, cleared otherwise
+ */
+ env->cc_z = val != lb && val != ub;
+ env->cc_c = lb <= ub ? val < lb || val > ub : val > ub && val < lb;
+
+ if (env->cc_c) {
+ CPUState *cs = CPU(m68k_env_get_cpu(env));
+
+ /* Recover PC and CC_OP for the beginning of the insn. */
+ cpu_restore_state(cs, GETPC());
+
+ /* flags have been modified by gen_flush_flags() */
+ env->cc_op = CC_OP_FLAGS;
+ /* Adjust PC to end of the insn. */
+ env->pc += 4;
+
+ cs->exception_index = EXCP_CHK;
+ cpu_loop_exit(cs);
+ }
+}
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index a1e424e..7f52065 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -4203,6 +4203,80 @@ DISAS_INSN(ff1)
gen_helper_ff1(reg, reg);
}
+DISAS_INSN(chk)
+{
+ TCGv src, reg;
+ int opsize;
+
+ switch ((insn >> 7) & 3) {
+ case 3:
+ opsize = OS_WORD;
+ break;
+ case 2:
+ if (m68k_feature(env, M68K_FEATURE_CHK2)) {
+ opsize = OS_LONG;
+ break;
+ }
+ /* fallthru */
+ default:
+ gen_exception(s, s->insn_pc, EXCP_ILLEGAL);
+ return;
+ }
+ SRC_EA(env, src, opsize, 1, NULL);
+ reg = gen_extend(DREG(insn, 9), opsize, 1);
+
+ gen_flush_flags(s);
+ gen_helper_chk(cpu_env, reg, src);
+}
+
+DISAS_INSN(chk2)
+{
+ uint16_t ext;
+ TCGv addr1, addr2, bound1, bound2, reg;
+ int opsize;
+
+ switch ((insn >> 9) & 3) {
+ case 0:
+ opsize = OS_BYTE;
+ break;
+ case 1:
+ opsize = OS_WORD;
+ break;
+ case 2:
+ opsize = OS_LONG;
+ break;
+ default:
+ gen_exception(s, s->insn_pc, EXCP_ILLEGAL);
+ return;
+ }
+
+ ext = read_im16(env, s);
+ if ((ext & 0x0800) == 0) {
+ gen_exception(s, s->insn_pc, EXCP_ILLEGAL);
+ return;
+ }
+
+ addr1 = gen_lea(env, s, insn, OS_UNSIZED);
+ addr2 = tcg_temp_new();
+ tcg_gen_addi_i32(addr2, addr1, opsize_bytes(opsize));
+
+ bound1 = gen_load(s, opsize, addr1, 1);
+ tcg_temp_free(addr1);
+ bound2 = gen_load(s, opsize, addr2, 1);
+ tcg_temp_free(addr2);
+
+ reg = tcg_temp_new();
+ if (ext & 0x8000) {
+ tcg_gen_mov_i32(reg, AREG(ext, 12));
+ } else {
+ gen_ext(reg, DREG(ext, 12), opsize, 1);
+ }
+
+ gen_flush_flags(s);
+ gen_helper_chk2(cpu_env, reg, bound1, bound2);
+ tcg_temp_free(reg);
+}
+
static TCGv gen_get_sr(DisasContext *s)
{
TCGv ccr;
@@ -5306,7 +5380,7 @@ void register_m68k_insns (CPUM68KState *env)
BASE(undef, 0000, 0000);
INSN(arith_im, 0080, fff8, CF_ISA_A);
INSN(arith_im, 0000, ff00, M68000);
- INSN(undef, 00c0, ffc0, M68000);
+ INSN(chk2, 00c0, f9c0, CHK2);
INSN(bitrev, 00c0, fff8, CF_ISA_APLUSC);
BASE(bitop_reg, 0100, f1c0);
BASE(bitop_reg, 0140, f1c0);
@@ -5339,6 +5413,7 @@ void register_m68k_insns (CPUM68KState *env)
BASE(move, 1000, f000);
BASE(move, 2000, f000);
BASE(move, 3000, f000);
+ INSN(chk, 4000, f040, M68000);
INSN(strldsr, 40e7, ffff, CF_ISA_APLUSC);
INSN(negx, 4080, fff8, CF_ISA_A);
INSN(negx, 4000, ff00, M68000);
generated by cgit v1.1 at 2024-08-24 10:46:45 +0000