haraldwolff/qemu-patch-raspberry4
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target-sh4: MMU: separate execute and read/write permissions

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On SH4, the ITLB and UTLB configurations are memory mapped, so loading
ITLB entries from UTLB has to be simulated correctly. For that the QEMU
TLB has to be handle the execute (ITLB) and read/write permissions
(UTLB) seperately.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2010-02-02 22:32:14 +01:00
parent 03e3b61e4f
commit 5a25cc2b5c
1 changed files with 6 additions and 21 deletions
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27
target-sh4/helper.c
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@ -272,16 +272,6 @@ static int find_tlb_entry(CPUState * env, target_ulong address,
return match;
}
static int same_tlb_entry_exists(const tlb_t * haystack, uint8_t nbtlb,
const tlb_t * needle)
{
int i;
for (i = 0; i < nbtlb; i++)
if (!memcmp(&haystack[i], needle, sizeof(tlb_t)))
return 1;
return 0;
}
static void increment_urc(CPUState * env)
{
uint8_t urb, urc;
@ -314,8 +304,7 @@ static int find_itlb_entry(CPUState * env, target_ulong address,
n = itlb_replacement(env);
ientry = &env->itlb[n];
if (ientry->v) {
if (!same_tlb_entry_exists(env->utlb, UTLB_SIZE, ientry))
tlb_flush_page(env, ientry->vpn << 10);
tlb_flush_page(env, ientry->vpn << 10);
}
*ientry = env->utlb[e];
e = n;
@ -362,7 +351,7 @@ static int get_mmu_address(CPUState * env, target_ulong * physical,
if (!(env->sr & SR_MD) && !(matching->pr & 2))
n = MMU_ITLB_VIOLATION;
else
*prot = PAGE_READ;
*prot = PAGE_EXEC;
}
} else {
n = find_utlb_entry(env, address, use_asid);
@ -418,14 +407,14 @@ static int get_physical_address(CPUState * env, target_ulong * physical,
} else {
*physical = address;
}
*prot = PAGE_READ | PAGE_WRITE;
*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
return MMU_OK;
}
/* If MMU is disabled, return the corresponding physical page */
if (!env->mmucr & MMUCR_AT) {
*physical = address & 0x1FFFFFFF;
*prot = PAGE_READ | PAGE_WRITE;
*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
return MMU_OK;
}
@ -506,9 +495,7 @@ void cpu_load_tlb(CPUSH4State * env)
if (entry->v) {
/* Overwriting valid entry in utlb. */
target_ulong address = entry->vpn << 10;
if (!same_tlb_entry_exists(env->itlb, ITLB_SIZE, entry)) {
tlb_flush_page(env, address);
}
tlb_flush_page(env, address);
}
/* Take values into cpu status from registers. */
@ -623,9 +610,7 @@ void cpu_sh4_write_mmaped_utlb_addr(CPUSH4State *s, target_phys_addr_t addr,
if (entry->v) {
/* Overwriting valid entry in utlb. */
target_ulong address = entry->vpn << 10;
if (!same_tlb_entry_exists(s->itlb, ITLB_SIZE, entry)) {
tlb_flush_page(s, address);
}
tlb_flush_page(s, address);
}
entry->asid = asid;
entry->vpn = vpn;