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m68k: improve comments on m68k_move_to/from helpers

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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.

Backports 60d8e96453d090f71027f95e47e5ddbe17f670e3
This commit is contained in:
Lucien Murray-Pitts 2021-03-12 14:38:47 -05:00 committed by Lioncash
parent 32e9e17576
commit c6d5eea686
1 changed files with 30 additions and 9 deletions
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39
qemu/target/m68k/helper.c
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@ -56,13 +56,15 @@ 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;
@ -79,25 +81,30 @@ 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;
@ -105,12 +112,15 @@ 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;
@ -123,39 +133,50 @@ 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",