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authorLucien Murray-Pitts <lucienmp.qemu@gmail.com>2021-02-01 01:01:52 +0100
committerLaurent Vivier <laurent@vivier.eu>2021-02-11 21:10:01 +0100
commit4ecce5fb52314c02e680924cf8f5050b207e19d4 (patch)
tree5c2b17907a7de3b526e084530b253079222315a3
parentee2fc6c6da8b2d6f961c8559d62e990c65f67736 (diff)
downloadqemu-arm-4ecce5fb52314c02e680924cf8f5050b207e19d4.tar.gz
m68k: cascade m68k_features by m680xx_cpu_initfn() to improve readability
The m680XX_cpu_initfn functions have been rearranged to cascade starting from the base 68000, so that the 68010 then inherits from this, and so on until the 68060. This makes it simpler to track features since in most cases the m68k were product enhancements on each other, with only a few instructions being retired. Because each cpu class inherits the previous CPU class, then for example the 68020 also has the feature 68010, and 68000 and so on upto the 68060. - Added 68010 cpu class, and moved correct features into 68000/68010. - Added m68k_unset_feature to allow removing a feature in the inheritence Signed-off-by: Lucien Murray-Pitts <lucienmp.qemu@gmail.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu> Message-Id: <c652fe7537f8b4fe87a13ecbbc0ea751fb71532f.1612137712.git.balaton@eik.bme.hu> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
-rw-r--r--target/m68k/cpu.c72
-rw-r--r--target/m68k/cpu.h1
2 files changed, 39 insertions, 34 deletions
diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
index 5c72f24694..d0f8bd4433 100644
--- a/target/m68k/cpu.c
+++ b/target/m68k/cpu.c
@@ -41,6 +41,11 @@ static void m68k_set_feature(CPUM68KState *env, int feature)
env->features |= (1u << feature);
}
+static void m68k_unset_feature(CPUM68KState *env, int feature)
+{
+ env->features &= (-1u - (1u << feature));
+}
+
static void m68k_cpu_reset(DeviceState *dev)
{
CPUState *s = CPU(dev);
@@ -115,25 +120,18 @@ static void m68000_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_MOVEP);
}
-/* common features for 68020, 68030 and 68040 */
-static void m680x0_cpu_common(CPUM68KState *env)
+/*
+ * Adds BKPT, MOVE-from-SR *now priv instr, and MOVEC, MOVES, RTD
+ */
+static void m68010_cpu_initfn(Object *obj)
{
- m68k_set_feature(env, M68K_FEATURE_M68000);
- m68k_set_feature(env, M68K_FEATURE_USP);
- m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
- m68k_set_feature(env, M68K_FEATURE_QUAD_MULDIV);
- m68k_set_feature(env, M68K_FEATURE_BRAL);
- m68k_set_feature(env, M68K_FEATURE_BCCL);
- m68k_set_feature(env, M68K_FEATURE_BITFIELD);
- m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
- m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
- m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
- m68k_set_feature(env, M68K_FEATURE_FPU);
- m68k_set_feature(env, M68K_FEATURE_CAS);
- m68k_set_feature(env, M68K_FEATURE_BKPT);
+ M68kCPU *cpu = M68K_CPU(obj);
+ CPUM68KState *env = &cpu->env;
+
+ m68000_cpu_initfn(obj);
+ m68k_set_feature(env, M68K_FEATURE_M68010);
m68k_set_feature(env, M68K_FEATURE_RTD);
- m68k_set_feature(env, M68K_FEATURE_CHK2);
- m68k_set_feature(env, M68K_FEATURE_MOVEP);
+ m68k_set_feature(env, M68K_FEATURE_BKPT);
}
/*
@@ -148,8 +146,19 @@ static void m68020_cpu_initfn(Object *obj)
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
- m680x0_cpu_common(env);
+ m68010_cpu_initfn(obj);
+ m68k_unset_feature(env, M68K_FEATURE_M68010);
m68k_set_feature(env, M68K_FEATURE_M68020);
+ m68k_set_feature(env, M68K_FEATURE_QUAD_MULDIV);
+ m68k_set_feature(env, M68K_FEATURE_BRAL);
+ m68k_set_feature(env, M68K_FEATURE_BCCL);
+ m68k_set_feature(env, M68K_FEATURE_BITFIELD);
+ m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
+ m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
+ m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
+ m68k_set_feature(env, M68K_FEATURE_FPU);
+ m68k_set_feature(env, M68K_FEATURE_CAS);
+ m68k_set_feature(env, M68K_FEATURE_CHK2);
}
/*
@@ -165,7 +174,8 @@ static void m68030_cpu_initfn(Object *obj)
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
- m680x0_cpu_common(env);
+ m68020_cpu_initfn(obj);
+ m68k_unset_feature(env, M68K_FEATURE_M68020);
m68k_set_feature(env, M68K_FEATURE_M68030);
}
@@ -191,7 +201,8 @@ static void m68040_cpu_initfn(Object *obj)
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
- m680x0_cpu_common(env);
+ m68030_cpu_initfn(obj);
+ m68k_unset_feature(env, M68K_FEATURE_M68030);
m68k_set_feature(env, M68K_FEATURE_M68040);
}
@@ -211,21 +222,13 @@ static void m68060_cpu_initfn(Object *obj)
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
- m68k_set_feature(env, M68K_FEATURE_M68000);
- m68k_set_feature(env, M68K_FEATURE_USP);
- m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
- m68k_set_feature(env, M68K_FEATURE_BRAL);
- m68k_set_feature(env, M68K_FEATURE_BCCL);
- m68k_set_feature(env, M68K_FEATURE_BITFIELD);
- m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
- m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
- m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
- m68k_set_feature(env, M68K_FEATURE_FPU);
- 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);
+ m68040_cpu_initfn(obj);
+ m68k_unset_feature(env, M68K_FEATURE_M68040);
m68k_set_feature(env, M68K_FEATURE_M68060);
+ m68k_unset_feature(env, M68K_FEATURE_MOVEP);
+
+ /* Implemented as a software feature */
+ m68k_unset_feature(env, M68K_FEATURE_QUAD_MULDIV);
}
static void m5208_cpu_initfn(Object *obj)
@@ -577,6 +580,7 @@ static const TypeInfo m68k_cpus_type_infos[] = {
.class_init = m68k_cpu_class_init,
},
DEFINE_M68K_CPU_TYPE_M68K(m68000),
+ DEFINE_M68K_CPU_TYPE_M68K(m68010),
DEFINE_M68K_CPU_TYPE_M68K(m68020),
DEFINE_M68K_CPU_TYPE_M68K(m68030),
DEFINE_M68K_CPU_TYPE_M68K(m68040),
diff --git a/target/m68k/cpu.h b/target/m68k/cpu.h
index 1d59cbb3f4..2b1cdf241b 100644
--- a/target/m68k/cpu.h
+++ b/target/m68k/cpu.h
@@ -466,6 +466,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr);
enum m68k_features {
M68K_FEATURE_M68000, /* Base m68k instruction set */
+ M68K_FEATURE_M68010,
M68K_FEATURE_M68020,
M68K_FEATURE_M68030,
M68K_FEATURE_M68040,