diff options
Diffstat (limited to 'target-sh4')
| -rw-r--r-- | target-sh4/helper.c | 65 |
1 files changed, 44 insertions, 21 deletions
diff --git a/target-sh4/helper.c b/target-sh4/helper.c index 863886b..2343366 100644 --- a/target-sh4/helper.c +++ b/target-sh4/helper.c @@ -280,35 +280,40 @@ static void increment_urc(CPUState * env) env->mmucr = (env->mmucr & 0xffff03ff) | (urc << 10); } -/* Find itlb entry - update itlb from utlb if necessary and asked for +/* Copy and utlb entry into itlb + Return entry +*/ +static int copy_utlb_entry_itlb(CPUState *env, int utlb) +{ + int itlb; + + tlb_t * ientry; + itlb = itlb_replacement(env); + ientry = &env->itlb[itlb]; + if (ientry->v) { + tlb_flush_page(env, ientry->vpn << 10); + } + *ientry = env->utlb[utlb]; + update_itlb_use(env, itlb); + return itlb; +} + +/* Find itlb entry Return entry, MMU_ITLB_MISS, MMU_ITLB_MULTIPLE or MMU_DTLB_MULTIPLE - Update the itlb from utlb if update is not 0 */ static int find_itlb_entry(CPUState * env, target_ulong address, - int use_asid, int update) + int use_asid) { - int e, n; + int e; e = find_tlb_entry(env, address, env->itlb, ITLB_SIZE, use_asid); - if (e == MMU_DTLB_MULTIPLE) + if (e == MMU_DTLB_MULTIPLE) { e = MMU_ITLB_MULTIPLE; - else if (e == MMU_DTLB_MISS && update) { - e = find_tlb_entry(env, address, env->utlb, UTLB_SIZE, use_asid); - if (e >= 0) { - tlb_t * ientry; - n = itlb_replacement(env); - ientry = &env->itlb[n]; - if (ientry->v) { - tlb_flush_page(env, ientry->vpn << 10); - } - *ientry = env->utlb[e]; - e = n; - } else if (e == MMU_DTLB_MISS) - e = MMU_ITLB_MISS; - } else if (e == MMU_DTLB_MISS) + } else if (e == MMU_DTLB_MISS) { e = MMU_ITLB_MISS; - if (e >= 0) + } else if (e >= 0) { update_itlb_use(env, e); + } return e; } @@ -340,13 +345,31 @@ static int get_mmu_address(CPUState * env, target_ulong * physical, use_asid = (env->mmucr & MMUCR_SV) == 0 || (env->sr & SR_MD) == 0; if (rw == 2) { - n = find_itlb_entry(env, address, use_asid, 1); + n = find_itlb_entry(env, address, use_asid); if (n >= 0) { matching = &env->itlb[n]; if (!(env->sr & SR_MD) && !(matching->pr & 2)) n = MMU_ITLB_VIOLATION; else *prot = PAGE_EXEC; + } else { + n = find_utlb_entry(env, address, use_asid); + if (n >= 0) { + n = copy_utlb_entry_itlb(env, n); + matching = &env->itlb[n]; + if (!(env->sr & SR_MD) && !(matching->pr & 2)) { + n = MMU_ITLB_VIOLATION; + } else { + *prot = PAGE_READ | PAGE_EXEC; + if ((matching->pr & 1) && matching->d) { + *prot |= PAGE_WRITE; + } + } + } else if (n == MMU_DTLB_MULTIPLE) { + n = MMU_ITLB_MULTIPLE; + } else if (n == MMU_DTLB_MISS) { + n = MMU_ITLB_MISS; + } } } else { n = find_utlb_entry(env, address, use_asid); |