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m68k: MOVEC insn. should generate exception if wrong CR is accessed 

Add CPU class detection for each CR type in the m68k_move_to/from helpers,
so that it throws and exception if an unsupported register is requested
for that CPU class.

Reclassified MOVEC insn. as only supported from 68010.

Signed-off-by: Lucien Murray-Pitts <lucienmp.qemu@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <fc0d0187478716f05d990949347071969b743151.1612137712.git.balaton@eik.bme.hu>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Lucien Murray-Pitts 2021-02-01 01:01:52 +01:00 committed by Laurent Vivier
parent 5736526ce2
commit 8df0e6aeda
4 changed files with 146 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
target/m68k/cpu.c
View File

@ -132,6 +132,7 @@ static void m68010_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_M68010);
m68k_set_feature(env, M68K_FEATURE_RTD);
m68k_set_feature(env, M68K_FEATURE_BKPT);
m68k_set_feature(env, M68K_FEATURE_MOVEC);
}
/*

1
target/m68k/cpu.h
View File

@ -497,6 +497,7 @@ enum m68k_features {
M68K_FEATURE_RTD, /* RTD insn. (680[12346]0, and CPU32) */
M68K_FEATURE_CHK2, /* CHK2 insn. (680[2346]0, and CPU32) */
M68K_FEATURE_MOVEP, /* MOVEP insn. (680[01234]0, and CPU32) */
M68K_FEATURE_MOVEC, /* MOVEC insn. (from 68010) */
};
static inline int m68k_feature(CPUM68KState *env, int feature)

188
target/m68k/helper.c
View File

@ -184,6 +184,14 @@ void HELPER(cf_movec_to)(CPUM68KState *env, uint32_t reg, uint32_t val)
}
}
static void raise_exception_ra(CPUM68KState *env, int tt, uintptr_t raddr)
{
CPUState *cs = env_cpu(env);
cs->exception_index = tt;
cpu_loop_exit_restore(cs, raddr);
}
void HELPER(m68k_movec_to)(CPUM68KState *env, uint32_t reg, uint32_t val)
{
switch (reg) {
@ -209,61 +217,104 @@ void HELPER(m68k_movec_to)(CPUM68KState *env, uint32_t reg, uint32_t val)
env->cacr = val & 0x80008000;
} else if (m68k_feature(env, M68K_FEATURE_M68060)) {
env->cacr = val & 0xf8e0e000;
} else {
break;
}
m68k_switch_sp(env);
return;
/* MC680[46]0 */
case M68K_CR_TC:
env->mmu.tcr = val;
return;
if (m68k_feature(env, M68K_FEATURE_M68040)
|| m68k_feature(env, M68K_FEATURE_M68060)) {
env->mmu.tcr = val;
return;
}
break;
/* MC68040 */
case M68K_CR_MMUSR:
env->mmu.mmusr = val;
return;
if (m68k_feature(env, M68K_FEATURE_M68040)) {
env->mmu.mmusr = val;
return;
}
break;
/* MC680[46]0 */
case M68K_CR_SRP:
env->mmu.srp = val;
return;
case M68K_CR_URP:
env->mmu.urp = val;
return;
if (m68k_feature(env, M68K_FEATURE_M68040)
|| m68k_feature(env, M68K_FEATURE_M68060)) {
env->mmu.srp = val;
return;
}
break;
/* MC680[46]0 */
case M68K_CR_URP:
if (m68k_feature(env, M68K_FEATURE_M68040)
|| m68k_feature(env, M68K_FEATURE_M68060)) {
env->mmu.urp = val;
return;
}
break;
/* MC680[12346]0 */
case M68K_CR_USP:
env->sp[M68K_USP] = val;
return;
/* MC680[234]0 */
case M68K_CR_MSP:
env->sp[M68K_SSP] = val;
return;
if (m68k_feature(env, M68K_FEATURE_M68020)
|| m68k_feature(env, M68K_FEATURE_M68030)
|| m68k_feature(env, M68K_FEATURE_M68040)) {
env->sp[M68K_SSP] = val;
return;
}
break;
/* MC680[234]0 */
case M68K_CR_ISP:
env->sp[M68K_ISP] = val;
return;
if (m68k_feature(env, M68K_FEATURE_M68020)
|| m68k_feature(env, M68K_FEATURE_M68030)
|| m68k_feature(env, M68K_FEATURE_M68040)) {
env->sp[M68K_ISP] = val;
return;
}
break;
/* MC68040/MC68LC040 */
case M68K_CR_ITT0:
env->mmu.ttr[M68K_ITTR0] = val;
return;
case M68K_CR_ITT0: /* MC68EC040 only: M68K_CR_IACR0 */
if (m68k_feature(env, M68K_FEATURE_M68040)) {
env->mmu.ttr[M68K_ITTR0] = val;
return;
}
break;
/* MC68040/MC68LC040 */
case M68K_CR_ITT1:
env->mmu.ttr[M68K_ITTR1] = val;
return;
case M68K_CR_ITT1: /* MC68EC040 only: M68K_CR_IACR1 */
if (m68k_feature(env, M68K_FEATURE_M68040)) {
env->mmu.ttr[M68K_ITTR1] = val;
return;
}
break;
/* MC68040/MC68LC040 */
case M68K_CR_DTT0:
env->mmu.ttr[M68K_DTTR0] = val;
return;
case M68K_CR_DTT0: /* MC68EC040 only: M68K_CR_DACR0 */
if (m68k_feature(env, M68K_FEATURE_M68040)) {
env->mmu.ttr[M68K_DTTR0] = val;
return;
}
break;
/* MC68040/MC68LC040 */
case M68K_CR_DTT1:
env->mmu.ttr[M68K_DTTR1] = val;
return;
case M68K_CR_DTT1: /* MC68EC040 only: M68K_CR_DACR1 */
if (m68k_feature(env, M68K_FEATURE_M68040)) {
env->mmu.ttr[M68K_DTTR1] = val;
return;
}
break;
/* Unimplemented Registers */
case M68K_CR_CAAR:
case M68K_CR_PCR:
case M68K_CR_BUSCR:
break;
cpu_abort(env_cpu(env),
"Unimplemented control register write 0x%x = 0x%x\n",
reg, val);
}
cpu_abort(env_cpu(env),
"Unimplemented control register write 0x%x = 0x%x\n",
reg, val);
/* Invalid control registers will generate an exception. */
raise_exception_ra(env, EXCP_ILLEGAL, 0);
return;
}
uint32_t HELPER(m68k_movec_from)(CPUM68KState *env, uint32_t reg)
@ -280,48 +331,95 @@ uint32_t HELPER(m68k_movec_from)(CPUM68KState *env, uint32_t reg)
return env->vbr;
/* MC680[2346]0 */
case M68K_CR_CACR:
return env->cacr;
if (m68k_feature(env, M68K_FEATURE_M68020)
|| m68k_feature(env, M68K_FEATURE_M68030)
|| m68k_feature(env, M68K_FEATURE_M68040)
|| m68k_feature(env, M68K_FEATURE_M68060)) {
return env->cacr;
}
break;
/* MC680[46]0 */
case M68K_CR_TC:
return env->mmu.tcr;
if (m68k_feature(env, M68K_FEATURE_M68040)
|| m68k_feature(env, M68K_FEATURE_M68060)) {
return env->mmu.tcr;
}
break;
/* MC68040 */
case M68K_CR_MMUSR:
return env->mmu.mmusr;
if (m68k_feature(env, M68K_FEATURE_M68040)) {
return env->mmu.mmusr;
}
break;
/* MC680[46]0 */
case M68K_CR_SRP:
return env->mmu.srp;
if (m68k_feature(env, M68K_FEATURE_M68040)
|| m68k_feature(env, M68K_FEATURE_M68060)) {
return env->mmu.srp;
}
break;
/* MC68040/MC68LC040 */
case M68K_CR_URP:
if (m68k_feature(env, M68K_FEATURE_M68040)
|| m68k_feature(env, M68K_FEATURE_M68060)) {
return env->mmu.urp;
}
break;
/* MC680[46]0 */
case M68K_CR_USP:
return env->sp[M68K_USP];
/* MC680[234]0 */
case M68K_CR_MSP:
return env->sp[M68K_SSP];
if (m68k_feature(env, M68K_FEATURE_M68020)
|| m68k_feature(env, M68K_FEATURE_M68030)
|| m68k_feature(env, M68K_FEATURE_M68040)) {
return env->sp[M68K_SSP];
}
break;
/* MC680[234]0 */
case M68K_CR_ISP:
return env->sp[M68K_ISP];
/* MC68040/MC68LC040 */
case M68K_CR_URP:
return env->mmu.urp;
if (m68k_feature(env, M68K_FEATURE_M68020)
|| m68k_feature(env, M68K_FEATURE_M68030)
|| m68k_feature(env, M68K_FEATURE_M68040)) {
return env->sp[M68K_ISP];
}
break;
/* MC68040/MC68LC040 */
case M68K_CR_ITT0: /* MC68EC040 only: M68K_CR_IACR0 */
return env->mmu.ttr[M68K_ITTR0];
if (m68k_feature(env, M68K_FEATURE_M68040)) {
return env->mmu.ttr[M68K_ITTR0];
}
break;
/* MC68040/MC68LC040 */
case M68K_CR_ITT1: /* MC68EC040 only: M68K_CR_IACR1 */
return env->mmu.ttr[M68K_ITTR1];
if (m68k_feature(env, M68K_FEATURE_M68040)) {
return env->mmu.ttr[M68K_ITTR1];
}
break;
/* MC68040/MC68LC040 */
case M68K_CR_DTT0: /* MC68EC040 only: M68K_CR_DACR0 */
return env->mmu.ttr[M68K_DTTR0];
if (m68k_feature(env, M68K_FEATURE_M68040)) {
return env->mmu.ttr[M68K_DTTR0];
}
break;
/* MC68040/MC68LC040 */
case M68K_CR_DTT1: /* MC68EC040 only: M68K_CR_DACR1 */
return env->mmu.ttr[M68K_DTTR1];
if (m68k_feature(env, M68K_FEATURE_M68040)) {
return env->mmu.ttr[M68K_DTTR1];
}
break;
/* Unimplemented Registers */
case M68K_CR_CAAR:
case M68K_CR_PCR:
case M68K_CR_BUSCR:
break;
cpu_abort(env_cpu(env), "Unimplemented control register read 0x%x\n",
reg);
}
cpu_abort(env_cpu(env), "Unimplemented control register read 0x%x\n",
reg);
/* Invalid control registers will generate an exception. */
raise_exception_ra(env, EXCP_ILLEGAL, 0);
return 0;
}
void HELPER(set_macsr)(CPUM68KState *env, uint32_t val)

2
target/m68k/translate.c
View File

@ -6010,7 +6010,7 @@ void register_m68k_insns (CPUM68KState *env)
BASE(stop, 4e72, ffff);
BASE(rte, 4e73, ffff);
INSN(cf_movec, 4e7b, ffff, CF_ISA_A);
INSN(m68k_movec, 4e7a, fffe, M68000);
INSN(m68k_movec, 4e7a, fffe, MOVEC);
#endif
BASE(nop, 4e71, ffff);
INSN(rtd, 4e74, ffff, RTD);