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m68k: improve comments on m68k_move_to/from helpers 

Add more detailed comments to each case of m68k_move_to/from helpers to list
the supported CPUs for that CR as they were wrong in some cases, and
missing some cpu classes in other cases.

Signed-off-by: Lucien Murray-Pitts <lucienmp.qemu@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <a8bd70b66e3dbdb7d2ab7a852af71cdbf341d50c.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 4ecce5fb52
commit 60d8e96453
1 changed files with 30 additions and 9 deletions
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39
target/m68k/helper.c
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@ -187,13 +187,15 @@ void HELPER(cf_movec_to)(CPUM68KState *env, uint32_t reg, uint32_t val)
void HELPER(m68k_movec_to)(CPUM68KState *env, uint32_t reg, uint32_t val)
{
switch (reg) {
/* MC680[1234]0 */
/* MC680[12346]0 */
case M68K_CR_SFC:
env->sfc = val & 7;
return;
/* MC680[12346]0 */
case M68K_CR_DFC:
env->dfc = val & 7;
return;
/* MC680[12346]0 */
case M68K_CR_VBR:
env->vbr = val;
return;
@ -210,25 +212,30 @@ void HELPER(m68k_movec_to)(CPUM68KState *env, uint32_t reg, uint32_t val)
}
m68k_switch_sp(env);
return;
/* MC680[34]0 */
/* MC680[46]0 */
case M68K_CR_TC:
env->mmu.tcr = val;
return;
/* MC68040 */
case M68K_CR_MMUSR:
env->mmu.mmusr = val;
return;
/* MC680[46]0 */
case M68K_CR_SRP:
env->mmu.srp = val;
return;
case M68K_CR_URP:
env->mmu.urp = val;
return;
/* MC680[46]0 */
case M68K_CR_USP:
env->sp[M68K_USP] = val;
return;
/* MC680[234]0 */
case M68K_CR_MSP:
env->sp[M68K_SSP] = val;
return;
/* MC680[234]0 */
case M68K_CR_ISP:
env->sp[M68K_ISP] = val;
return;
@ -236,12 +243,15 @@ void HELPER(m68k_movec_to)(CPUM68KState *env, uint32_t reg, uint32_t val)
case M68K_CR_ITT0:
env->mmu.ttr[M68K_ITTR0] = val;
return;
/* MC68040/MC68LC040 */
case M68K_CR_ITT1:
env->mmu.ttr[M68K_ITTR1] = val;
return;
/* MC68040/MC68LC040 */
case M68K_CR_DTT0:
env->mmu.ttr[M68K_DTTR0] = val;
return;
/* MC68040/MC68LC040 */
case M68K_CR_DTT1:
env->mmu.ttr[M68K_DTTR1] = val;
return;
@ -254,39 +264,50 @@ void HELPER(m68k_movec_to)(CPUM68KState *env, uint32_t reg, uint32_t val)
uint32_t HELPER(m68k_movec_from)(CPUM68KState *env, uint32_t reg)
{
switch (reg) {
/* MC680[1234]0 */
/* MC680[12346]0 */
case M68K_CR_SFC:
return env->sfc;
/* MC680[12346]0 */
case M68K_CR_DFC:
return env->dfc;
/* MC680[12346]0 */
case M68K_CR_VBR:
return env->vbr;
/* MC680[234]0 */
/* MC680[2346]0 */
case M68K_CR_CACR:
return env->cacr;
/* MC680[34]0 */
/* MC680[46]0 */
case M68K_CR_TC:
return env->mmu.tcr;
/* MC68040 */
case M68K_CR_MMUSR:
return env->mmu.mmusr;
/* MC680[46]0 */
case M68K_CR_SRP:
return env->mmu.srp;
/* MC680[46]0 */
case M68K_CR_USP:
return env->sp[M68K_USP];
/* MC680[234]0 */
case M68K_CR_MSP:
return env->sp[M68K_SSP];
/* MC680[234]0 */
case M68K_CR_ISP:
return env->sp[M68K_ISP];
/* MC68040/MC68LC040 */
case M68K_CR_URP:
return env->mmu.urp;
case M68K_CR_ITT0:
/* MC68040/MC68LC040 */
case M68K_CR_ITT0: /* MC68EC040 only: M68K_CR_IACR0 */
return env->mmu.ttr[M68K_ITTR0];
case M68K_CR_ITT1:
/* MC68040/MC68LC040 */
case M68K_CR_ITT1: /* MC68EC040 only: M68K_CR_IACR1 */
return env->mmu.ttr[M68K_ITTR1];
case M68K_CR_DTT0:
/* MC68040/MC68LC040 */
case M68K_CR_DTT0: /* MC68EC040 only: M68K_CR_DACR0 */
return env->mmu.ttr[M68K_DTTR0];
case M68K_CR_DTT1:
/* MC68040/MC68LC040 */
case M68K_CR_DTT1: /* MC68EC040 only: M68K_CR_DACR1 */
return env->mmu.ttr[M68K_DTTR1];
}
cpu_abort(env_cpu(env), "Unimplemented control register read 0x%x\n",