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[PULL 5/7] m68k: MOVEC insn. should generate exception if wrong CR is ac
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From: |
Laurent Vivier |
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Subject: |
[PULL 5/7] m68k: MOVEC insn. should generate exception if wrong CR is accessed |
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Date: |
Fri, 12 Feb 2021 22:14:46 +0100 |
From: Lucien Murray-Pitts <lucienmp.qemu@gmail.com>
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>
---
target/m68k/cpu.h | 1 +
target/m68k/cpu.c | 1 +
target/m68k/helper.c | 188 ++++++++++++++++++++++++++++++----------
target/m68k/translate.c | 2 +-
4 files changed, 146 insertions(+), 46 deletions(-)
diff --git a/target/m68k/cpu.h b/target/m68k/cpu.h
index ae34c9461503..5d2cb012e510 100644
--- a/target/m68k/cpu.h
+++ b/target/m68k/cpu.h
@@ -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)
diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
index d0f8bd44339c..ff3c4c1c9802 100644
--- a/target/m68k/cpu.c
+++ b/target/m68k/cpu.c
@@ -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);
}
/*
diff --git a/target/m68k/helper.c b/target/m68k/helper.c
index 69acdc3b353c..1efd6e4f6555 100644
--- a/target/m68k/helper.c
+++ b/target/m68k/helper.c
@@ -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)
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 133a4049191e..ac936ebe8f14 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -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);
--
2.29.2
- [PULL 0/7] M68k for 6.0 patches, Laurent Vivier, 2021/02/12
- [PULL 3/7] m68k: improve comments on m68k_move_to/from helpers, Laurent Vivier, 2021/02/12
- [PULL 1/7] m68k: improve cpu instantiation comments, Laurent Vivier, 2021/02/12
- [PULL 2/7] m68k: cascade m68k_features by m680xx_cpu_initfn() to improve readability, Laurent Vivier, 2021/02/12
- [PULL 4/7] m68k: add missing BUSCR/PCR CR defines, and BUSCR/PCR/CAAR CR to m68k_move_to/from, Laurent Vivier, 2021/02/12
- [PULL 5/7] m68k: MOVEC insn. should generate exception if wrong CR is accessed,
Laurent Vivier <=
- [PULL 6/7] m68k: add MSP detection support for stack pointer swap helpers, Laurent Vivier, 2021/02/12
- [PULL 7/7] m68k: import bootinfo headers from linux, Laurent Vivier, 2021/02/12
- Re: [PULL 0/7] M68k for 6.0 patches, Peter Maydell, 2021/02/13