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Projet_SETI_RISC-V/riscv-gnu-toolchain/qemu/accel/tcg/cputlb.c

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projet
2023-03-06 14:48:14 +01:00
/*
* Common CPU TLB handling
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "hw/core/tcg-cpu-ops.h"
#include "exec/exec-all.h"
#include "exec/memory.h"
#include "exec/cpu_ldst.h"
#include "exec/cputlb.h"
#include "exec/memory-internal.h"
#include "exec/ram_addr.h"
#include "tcg/tcg.h"
#include "qemu/error-report.h"
#include "exec/log.h"
#include "exec/helper-proto.h"
#include "qemu/atomic.h"
#include "qemu/atomic128.h"
#include "exec/translate-all.h"
#include "trace/trace-root.h"
#include "tb-hash.h"
#include "internal.h"
#ifdef CONFIG_PLUGIN
#include "qemu/plugin-memory.h"
#endif
#include "tcg/tcg-ldst.h"
/* DEBUG defines, enable DEBUG_TLB_LOG to log to the CPU_LOG_MMU target */
/* #define DEBUG_TLB */
/* #define DEBUG_TLB_LOG */
#ifdef DEBUG_TLB
# define DEBUG_TLB_GATE 1
# ifdef DEBUG_TLB_LOG
# define DEBUG_TLB_LOG_GATE 1
# else
# define DEBUG_TLB_LOG_GATE 0
# endif
#else
# define DEBUG_TLB_GATE 0
# define DEBUG_TLB_LOG_GATE 0
#endif
#define tlb_debug(fmt, ...) do { \
if (DEBUG_TLB_LOG_GATE) { \
qemu_log_mask(CPU_LOG_MMU, "%s: " fmt, __func__, \
## __VA_ARGS__); \
} else if (DEBUG_TLB_GATE) { \
fprintf(stderr, "%s: " fmt, __func__, ## __VA_ARGS__); \
} \
} while (0)
#define assert_cpu_is_self(cpu) do { \
if (DEBUG_TLB_GATE) { \
g_assert(!(cpu)->created || qemu_cpu_is_self(cpu)); \
} \
} while (0)
/* run_on_cpu_data.target_ptr should always be big enough for a
* target_ulong even on 32 bit builds */
QEMU_BUILD_BUG_ON(sizeof(target_ulong) > sizeof(run_on_cpu_data));
/* We currently can't handle more than 16 bits in the MMUIDX bitmask.
*/
QEMU_BUILD_BUG_ON(NB_MMU_MODES > 16);
#define ALL_MMUIDX_BITS ((1 << NB_MMU_MODES) - 1)
static inline size_t tlb_n_entries(CPUTLBDescFast *fast)
{
return (fast->mask >> CPU_TLB_ENTRY_BITS) + 1;
}
static inline size_t sizeof_tlb(CPUTLBDescFast *fast)
{
return fast->mask + (1 << CPU_TLB_ENTRY_BITS);
}
static void tlb_window_reset(CPUTLBDesc *desc, int64_t ns,
size_t max_entries)
{
desc->window_begin_ns = ns;
desc->window_max_entries = max_entries;
}
static void tb_jmp_cache_clear_page(CPUState *cpu, target_ulong page_addr)
{
unsigned int i, i0 = tb_jmp_cache_hash_page(page_addr);
for (i = 0; i < TB_JMP_PAGE_SIZE; i++) {
qatomic_set(&cpu->tb_jmp_cache[i0 + i], NULL);
}
}
static void tb_flush_jmp_cache(CPUState *cpu, target_ulong addr)
{
/* Discard jump cache entries for any tb which might potentially
overlap the flushed page. */
tb_jmp_cache_clear_page(cpu, addr - TARGET_PAGE_SIZE);
tb_jmp_cache_clear_page(cpu, addr);
}
/**
* tlb_mmu_resize_locked() - perform TLB resize bookkeeping; resize if necessary
* @desc: The CPUTLBDesc portion of the TLB
* @fast: The CPUTLBDescFast portion of the same TLB
*
* Called with tlb_lock_held.
*
* We have two main constraints when resizing a TLB: (1) we only resize it
* on a TLB flush (otherwise we'd have to take a perf hit by either rehashing
* the array or unnecessarily flushing it), which means we do not control how
* frequently the resizing can occur; (2) we don't have access to the guest's
* future scheduling decisions, and therefore have to decide the magnitude of
* the resize based on past observations.
*
* In general, a memory-hungry process can benefit greatly from an appropriately
* sized TLB, since a guest TLB miss is very expensive. This doesn't mean that
* we just have to make the TLB as large as possible; while an oversized TLB
* results in minimal TLB miss rates, it also takes longer to be flushed
* (flushes can be _very_ frequent), and the reduced locality can also hurt
* performance.
*
* To achieve near-optimal performance for all kinds of workloads, we:
*
* 1. Aggressively increase the size of the TLB when the use rate of the
* TLB being flushed is high, since it is likely that in the near future this
* memory-hungry process will execute again, and its memory hungriness will
* probably be similar.
*
* 2. Slowly reduce the size of the TLB as the use rate declines over a
* reasonably large time window. The rationale is that if in such a time window
* we have not observed a high TLB use rate, it is likely that we won't observe
* it in the near future. In that case, once a time window expires we downsize
* the TLB to match the maximum use rate observed in the window.
*
* 3. Try to keep the maximum use rate in a time window in the 30-70% range,
* since in that range performance is likely near-optimal. Recall that the TLB
* is direct mapped, so we want the use rate to be low (or at least not too
* high), since otherwise we are likely to have a significant amount of
* conflict misses.
*/
static void tlb_mmu_resize_locked(CPUTLBDesc *desc, CPUTLBDescFast *fast,
int64_t now)
{
size_t old_size = tlb_n_entries(fast);
size_t rate;
size_t new_size = old_size;
int64_t window_len_ms = 100;
int64_t window_len_ns = window_len_ms * 1000 * 1000;
bool window_expired = now > desc->window_begin_ns + window_len_ns;
if (desc->n_used_entries > desc->window_max_entries) {
desc->window_max_entries = desc->n_used_entries;
}
rate = desc->window_max_entries * 100 / old_size;
if (rate > 70) {
new_size = MIN(old_size << 1, 1 << CPU_TLB_DYN_MAX_BITS);
} else if (rate < 30 && window_expired) {
size_t ceil = pow2ceil(desc->window_max_entries);
size_t expected_rate = desc->window_max_entries * 100 / ceil;
/*
* Avoid undersizing when the max number of entries seen is just below
* a pow2. For instance, if max_entries == 1025, the expected use rate
* would be 1025/2048==50%. However, if max_entries == 1023, we'd get
* 1023/1024==99.9% use rate, so we'd likely end up doubling the size
* later. Thus, make sure that the expected use rate remains below 70%.
* (and since we double the size, that means the lowest rate we'd
* expect to get is 35%, which is still in the 30-70% range where
* we consider that the size is appropriate.)
*/
if (expected_rate > 70) {
ceil *= 2;
}
new_size = MAX(ceil, 1 << CPU_TLB_DYN_MIN_BITS);
}
if (new_size == old_size) {
if (window_expired) {
tlb_window_reset(desc, now, desc->n_used_entries);
}
return;
}
g_free(fast->table);
g_free(desc->iotlb);
tlb_window_reset(desc, now, 0);
/* desc->n_used_entries is cleared by the caller */
fast->mask = (new_size - 1) << CPU_TLB_ENTRY_BITS;
fast->table = g_try_new(CPUTLBEntry, new_size);
desc->iotlb = g_try_new(CPUIOTLBEntry, new_size);
/*
* If the allocations fail, try smaller sizes. We just freed some
* memory, so going back to half of new_size has a good chance of working.
* Increased memory pressure elsewhere in the system might cause the
* allocations to fail though, so we progressively reduce the allocation
* size, aborting if we cannot even allocate the smallest TLB we support.
*/
while (fast->table == NULL || desc->iotlb == NULL) {
if (new_size == (1 << CPU_TLB_DYN_MIN_BITS)) {
error_report("%s: %s", __func__, strerror(errno));
abort();
}
new_size = MAX(new_size >> 1, 1 << CPU_TLB_DYN_MIN_BITS);
fast->mask = (new_size - 1) << CPU_TLB_ENTRY_BITS;
g_free(fast->table);
g_free(desc->iotlb);
fast->table = g_try_new(CPUTLBEntry, new_size);
desc->iotlb = g_try_new(CPUIOTLBEntry, new_size);
}
}
static void tlb_mmu_flush_locked(CPUTLBDesc *desc, CPUTLBDescFast *fast)
{
desc->n_used_entries = 0;
desc->large_page_addr = -1;
desc->large_page_mask = -1;
desc->vindex = 0;
memset(fast->table, -1, sizeof_tlb(fast));
memset(desc->vtable, -1, sizeof(desc->vtable));
}
static void tlb_flush_one_mmuidx_locked(CPUArchState *env, int mmu_idx,
int64_t now)
{
CPUTLBDesc *desc = &env_tlb(env)->d[mmu_idx];
CPUTLBDescFast *fast = &env_tlb(env)->f[mmu_idx];
tlb_mmu_resize_locked(desc, fast, now);
tlb_mmu_flush_locked(desc, fast);
}
static void tlb_mmu_init(CPUTLBDesc *desc, CPUTLBDescFast *fast, int64_t now)
{
size_t n_entries = 1 << CPU_TLB_DYN_DEFAULT_BITS;
tlb_window_reset(desc, now, 0);
desc->n_used_entries = 0;
fast->mask = (n_entries - 1) << CPU_TLB_ENTRY_BITS;
fast->table = g_new(CPUTLBEntry, n_entries);
desc->iotlb = g_new(CPUIOTLBEntry, n_entries);
tlb_mmu_flush_locked(desc, fast);
}
static inline void tlb_n_used_entries_inc(CPUArchState *env, uintptr_t mmu_idx)
{
env_tlb(env)->d[mmu_idx].n_used_entries++;
}
static inline void tlb_n_used_entries_dec(CPUArchState *env, uintptr_t mmu_idx)
{
env_tlb(env)->d[mmu_idx].n_used_entries--;
}
void tlb_init(CPUState *cpu)
{
CPUArchState *env = cpu->env_ptr;
int64_t now = get_clock_realtime();
int i;
qemu_spin_init(&env_tlb(env)->c.lock);
/* All tlbs are initialized flushed. */
env_tlb(env)->c.dirty = 0;
for (i = 0; i < NB_MMU_MODES; i++) {
tlb_mmu_init(&env_tlb(env)->d[i], &env_tlb(env)->f[i], now);
}
}
void tlb_destroy(CPUState *cpu)
{
CPUArchState *env = cpu->env_ptr;
int i;
qemu_spin_destroy(&env_tlb(env)->c.lock);
for (i = 0; i < NB_MMU_MODES; i++) {
CPUTLBDesc *desc = &env_tlb(env)->d[i];
CPUTLBDescFast *fast = &env_tlb(env)->f[i];
g_free(fast->table);
g_free(desc->iotlb);
}
}
/* flush_all_helper: run fn across all cpus
*
* If the wait flag is set then the src cpu's helper will be queued as
* "safe" work and the loop exited creating a synchronisation point
* where all queued work will be finished before execution starts
* again.
*/
static void flush_all_helper(CPUState *src, run_on_cpu_func fn,
run_on_cpu_data d)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
if (cpu != src) {
async_run_on_cpu(cpu, fn, d);
}
}
}
void tlb_flush_counts(size_t *pfull, size_t *ppart, size_t *pelide)
{
CPUState *cpu;
size_t full = 0, part = 0, elide = 0;
CPU_FOREACH(cpu) {
CPUArchState *env = cpu->env_ptr;
full += qatomic_read(&env_tlb(env)->c.full_flush_count);
part += qatomic_read(&env_tlb(env)->c.part_flush_count);
elide += qatomic_read(&env_tlb(env)->c.elide_flush_count);
}
*pfull = full;
*ppart = part;
*pelide = elide;
}
static void tlb_flush_by_mmuidx_async_work(CPUState *cpu, run_on_cpu_data data)
{
CPUArchState *env = cpu->env_ptr;
uint16_t asked = data.host_int;
uint16_t all_dirty, work, to_clean;
int64_t now = get_clock_realtime();
assert_cpu_is_self(cpu);
tlb_debug("mmu_idx:0x%04" PRIx16 "\n", asked);
qemu_spin_lock(&env_tlb(env)->c.lock);
all_dirty = env_tlb(env)->c.dirty;
to_clean = asked & all_dirty;
all_dirty &= ~to_clean;
env_tlb(env)->c.dirty = all_dirty;
for (work = to_clean; work != 0; work &= work - 1) {
int mmu_idx = ctz32(work);
tlb_flush_one_mmuidx_locked(env, mmu_idx, now);
}
qemu_spin_unlock(&env_tlb(env)->c.lock);
cpu_tb_jmp_cache_clear(cpu);
if (to_clean == ALL_MMUIDX_BITS) {
qatomic_set(&env_tlb(env)->c.full_flush_count,
env_tlb(env)->c.full_flush_count + 1);
} else {
qatomic_set(&env_tlb(env)->c.part_flush_count,
env_tlb(env)->c.part_flush_count + ctpop16(to_clean));
if (to_clean != asked) {
qatomic_set(&env_tlb(env)->c.elide_flush_count,
env_tlb(env)->c.elide_flush_count +
ctpop16(asked & ~to_clean));
}
}
}
void tlb_flush_by_mmuidx(CPUState *cpu, uint16_t idxmap)
{
tlb_debug("mmu_idx: 0x%" PRIx16 "\n", idxmap);
if (cpu->created && !qemu_cpu_is_self(cpu)) {
async_run_on_cpu(cpu, tlb_flush_by_mmuidx_async_work,
RUN_ON_CPU_HOST_INT(idxmap));
} else {
tlb_flush_by_mmuidx_async_work(cpu, RUN_ON_CPU_HOST_INT(idxmap));
}
}
void tlb_flush(CPUState *cpu)
{
tlb_flush_by_mmuidx(cpu, ALL_MMUIDX_BITS);
}
void tlb_flush_by_mmuidx_all_cpus(CPUState *src_cpu, uint16_t idxmap)
{
const run_on_cpu_func fn = tlb_flush_by_mmuidx_async_work;
tlb_debug("mmu_idx: 0x%"PRIx16"\n", idxmap);
flush_all_helper(src_cpu, fn, RUN_ON_CPU_HOST_INT(idxmap));
fn(src_cpu, RUN_ON_CPU_HOST_INT(idxmap));
}
void tlb_flush_all_cpus(CPUState *src_cpu)
{
tlb_flush_by_mmuidx_all_cpus(src_cpu, ALL_MMUIDX_BITS);
}
void tlb_flush_by_mmuidx_all_cpus_synced(CPUState *src_cpu, uint16_t idxmap)
{
const run_on_cpu_func fn = tlb_flush_by_mmuidx_async_work;
tlb_debug("mmu_idx: 0x%"PRIx16"\n", idxmap);
flush_all_helper(src_cpu, fn, RUN_ON_CPU_HOST_INT(idxmap));
async_safe_run_on_cpu(src_cpu, fn, RUN_ON_CPU_HOST_INT(idxmap));
}
void tlb_flush_all_cpus_synced(CPUState *src_cpu)
{
tlb_flush_by_mmuidx_all_cpus_synced(src_cpu, ALL_MMUIDX_BITS);
}
static bool tlb_hit_page_mask_anyprot(CPUTLBEntry *tlb_entry,
target_ulong page, target_ulong mask)
{
page &= mask;
mask &= TARGET_PAGE_MASK | TLB_INVALID_MASK;
return (page == (tlb_entry->addr_read & mask) ||
page == (tlb_addr_write(tlb_entry) & mask) ||
page == (tlb_entry->addr_code & mask));
}
static inline bool tlb_hit_page_anyprot(CPUTLBEntry *tlb_entry,
target_ulong page)
{
return tlb_hit_page_mask_anyprot(tlb_entry, page, -1);
}
/**
* tlb_entry_is_empty - return true if the entry is not in use
* @te: pointer to CPUTLBEntry
*/
static inline bool tlb_entry_is_empty(const CPUTLBEntry *te)
{
return te->addr_read == -1 && te->addr_write == -1 && te->addr_code == -1;
}
/* Called with tlb_c.lock held */
static bool tlb_flush_entry_mask_locked(CPUTLBEntry *tlb_entry,
target_ulong page,
target_ulong mask)
{
if (tlb_hit_page_mask_anyprot(tlb_entry, page, mask)) {
memset(tlb_entry, -1, sizeof(*tlb_entry));
return true;
}
return false;
}
static inline bool tlb_flush_entry_locked(CPUTLBEntry *tlb_entry,
target_ulong page)
{
return tlb_flush_entry_mask_locked(tlb_entry, page, -1);
}
/* Called with tlb_c.lock held */
static void tlb_flush_vtlb_page_mask_locked(CPUArchState *env, int mmu_idx,
target_ulong page,
target_ulong mask)
{
CPUTLBDesc *d = &env_tlb(env)->d[mmu_idx];
int k;
assert_cpu_is_self(env_cpu(env));
for (k = 0; k < CPU_VTLB_SIZE; k++) {
if (tlb_flush_entry_mask_locked(&d->vtable[k], page, mask)) {
tlb_n_used_entries_dec(env, mmu_idx);
}
}
}
static inline void tlb_flush_vtlb_page_locked(CPUArchState *env, int mmu_idx,
target_ulong page)
{
tlb_flush_vtlb_page_mask_locked(env, mmu_idx, page, -1);
}
static void tlb_flush_page_locked(CPUArchState *env, int midx,
target_ulong page)
{
target_ulong lp_addr = env_tlb(env)->d[midx].large_page_addr;
target_ulong lp_mask = env_tlb(env)->d[midx].large_page_mask;
/* Check if we need to flush due to large pages. */
if ((page & lp_mask) == lp_addr) {
tlb_debug("forcing full flush midx %d ("
TARGET_FMT_lx "/" TARGET_FMT_lx ")\n",
midx, lp_addr, lp_mask);
tlb_flush_one_mmuidx_locked(env, midx, get_clock_realtime());
} else {
if (tlb_flush_entry_locked(tlb_entry(env, midx, page), page)) {
tlb_n_used_entries_dec(env, midx);
}
tlb_flush_vtlb_page_locked(env, midx, page);
}
}
/**
* tlb_flush_page_by_mmuidx_async_0:
* @cpu: cpu on which to flush
* @addr: page of virtual address to flush
* @idxmap: set of mmu_idx to flush
*
* Helper for tlb_flush_page_by_mmuidx and friends, flush one page
* at @addr from the tlbs indicated by @idxmap from @cpu.
*/
static void tlb_flush_page_by_mmuidx_async_0(CPUState *cpu,
target_ulong addr,
uint16_t idxmap)
{
CPUArchState *env = cpu->env_ptr;
int mmu_idx;
assert_cpu_is_self(cpu);
tlb_debug("page addr:" TARGET_FMT_lx " mmu_map:0x%x\n", addr, idxmap);
qemu_spin_lock(&env_tlb(env)->c.lock);
for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) {
if ((idxmap >> mmu_idx) & 1) {
tlb_flush_page_locked(env, mmu_idx, addr);
}
}
qemu_spin_unlock(&env_tlb(env)->c.lock);
tb_flush_jmp_cache(cpu, addr);
}
/**
* tlb_flush_page_by_mmuidx_async_1:
* @cpu: cpu on which to flush
* @data: encoded addr + idxmap
*
* Helper for tlb_flush_page_by_mmuidx and friends, called through
* async_run_on_cpu. The idxmap parameter is encoded in the page
* offset of the target_ptr field. This limits the set of mmu_idx
* that can be passed via this method.
*/
static void tlb_flush_page_by_mmuidx_async_1(CPUState *cpu,
run_on_cpu_data data)
{
target_ulong addr_and_idxmap = (target_ulong) data.target_ptr;
target_ulong addr = addr_and_idxmap & TARGET_PAGE_MASK;
uint16_t idxmap = addr_and_idxmap & ~TARGET_PAGE_MASK;
tlb_flush_page_by_mmuidx_async_0(cpu, addr, idxmap);
}
typedef struct {
target_ulong addr;
uint16_t idxmap;
} TLBFlushPageByMMUIdxData;
/**
* tlb_flush_page_by_mmuidx_async_2:
* @cpu: cpu on which to flush
* @data: allocated addr + idxmap
*
* Helper for tlb_flush_page_by_mmuidx and friends, called through
* async_run_on_cpu. The addr+idxmap parameters are stored in a
* TLBFlushPageByMMUIdxData structure that has been allocated
* specifically for this helper. Free the structure when done.
*/
static void tlb_flush_page_by_mmuidx_async_2(CPUState *cpu,
run_on_cpu_data data)
{
TLBFlushPageByMMUIdxData *d = data.host_ptr;
tlb_flush_page_by_mmuidx_async_0(cpu, d->addr, d->idxmap);
g_free(d);
}
void tlb_flush_page_by_mmuidx(CPUState *cpu, target_ulong addr, uint16_t idxmap)
{
tlb_debug("addr: "TARGET_FMT_lx" mmu_idx:%" PRIx16 "\n", addr, idxmap);
/* This should already be page aligned */
addr &= TARGET_PAGE_MASK;
if (qemu_cpu_is_self(cpu)) {
tlb_flush_page_by_mmuidx_async_0(cpu, addr, idxmap);
} else if (idxmap < TARGET_PAGE_SIZE) {
/*
* Most targets have only a few mmu_idx. In the case where
* we can stuff idxmap into the low TARGET_PAGE_BITS, avoid
* allocating memory for this operation.
*/
async_run_on_cpu(cpu, tlb_flush_page_by_mmuidx_async_1,
RUN_ON_CPU_TARGET_PTR(addr | idxmap));
} else {
TLBFlushPageByMMUIdxData *d = g_new(TLBFlushPageByMMUIdxData, 1);
/* Otherwise allocate a structure, freed by the worker. */
d->addr = addr;
d->idxmap = idxmap;
async_run_on_cpu(cpu, tlb_flush_page_by_mmuidx_async_2,
RUN_ON_CPU_HOST_PTR(d));
}
}
void tlb_flush_page(CPUState *cpu, target_ulong addr)
{
tlb_flush_page_by_mmuidx(cpu, addr, ALL_MMUIDX_BITS);
}
void tlb_flush_page_by_mmuidx_all_cpus(CPUState *src_cpu, target_ulong addr,
uint16_t idxmap)
{
tlb_debug("addr: "TARGET_FMT_lx" mmu_idx:%"PRIx16"\n", addr, idxmap);
/* This should already be page aligned */
addr &= TARGET_PAGE_MASK;
/*
* Allocate memory to hold addr+idxmap only when needed.
* See tlb_flush_page_by_mmuidx for details.
*/
if (idxmap < TARGET_PAGE_SIZE) {
flush_all_helper(src_cpu, tlb_flush_page_by_mmuidx_async_1,
RUN_ON_CPU_TARGET_PTR(addr | idxmap));
} else {
CPUState *dst_cpu;
/* Allocate a separate data block for each destination cpu. */
CPU_FOREACH(dst_cpu) {
if (dst_cpu != src_cpu) {
TLBFlushPageByMMUIdxData *d
= g_new(TLBFlushPageByMMUIdxData, 1);
d->addr = addr;
d->idxmap = idxmap;
async_run_on_cpu(dst_cpu, tlb_flush_page_by_mmuidx_async_2,
RUN_ON_CPU_HOST_PTR(d));
}
}
}
tlb_flush_page_by_mmuidx_async_0(src_cpu, addr, idxmap);
}
void tlb_flush_page_all_cpus(CPUState *src, target_ulong addr)
{
tlb_flush_page_by_mmuidx_all_cpus(src, addr, ALL_MMUIDX_BITS);
}
void tlb_flush_page_by_mmuidx_all_cpus_synced(CPUState *src_cpu,
target_ulong addr,
uint16_t idxmap)
{
tlb_debug("addr: "TARGET_FMT_lx" mmu_idx:%"PRIx16"\n", addr, idxmap);
/* This should already be page aligned */
addr &= TARGET_PAGE_MASK;
/*
* Allocate memory to hold addr+idxmap only when needed.
* See tlb_flush_page_by_mmuidx for details.
*/
if (idxmap < TARGET_PAGE_SIZE) {
flush_all_helper(src_cpu, tlb_flush_page_by_mmuidx_async_1,
RUN_ON_CPU_TARGET_PTR(addr | idxmap));
async_safe_run_on_cpu(src_cpu, tlb_flush_page_by_mmuidx_async_1,
RUN_ON_CPU_TARGET_PTR(addr | idxmap));
} else {
CPUState *dst_cpu;
TLBFlushPageByMMUIdxData *d;
/* Allocate a separate data block for each destination cpu. */
CPU_FOREACH(dst_cpu) {
if (dst_cpu != src_cpu) {
d = g_new(TLBFlushPageByMMUIdxData, 1);
d->addr = addr;
d->idxmap = idxmap;
async_run_on_cpu(dst_cpu, tlb_flush_page_by_mmuidx_async_2,
RUN_ON_CPU_HOST_PTR(d));
}
}
d = g_new(TLBFlushPageByMMUIdxData, 1);
d->addr = addr;
d->idxmap = idxmap;
async_safe_run_on_cpu(src_cpu, tlb_flush_page_by_mmuidx_async_2,
RUN_ON_CPU_HOST_PTR(d));
}
}
void tlb_flush_page_all_cpus_synced(CPUState *src, target_ulong addr)
{
tlb_flush_page_by_mmuidx_all_cpus_synced(src, addr, ALL_MMUIDX_BITS);
}
static void tlb_flush_range_locked(CPUArchState *env, int midx,
target_ulong addr, target_ulong len,
unsigned bits)
{
CPUTLBDesc *d = &env_tlb(env)->d[midx];
CPUTLBDescFast *f = &env_tlb(env)->f[midx];
target_ulong mask = MAKE_64BIT_MASK(0, bits);
/*
* If @bits is smaller than the tlb size, there may be multiple entries
* within the TLB; otherwise all addresses that match under @mask hit
* the same TLB entry.
* TODO: Perhaps allow bits to be a few bits less than the size.
* For now, just flush the entire TLB.
*
* If @len is larger than the tlb size, then it will take longer to
* test all of the entries in the TLB than it will to flush it all.
*/
if (mask < f->mask || len > f->mask) {
tlb_debug("forcing full flush midx %d ("
TARGET_FMT_lx "/" TARGET_FMT_lx "+" TARGET_FMT_lx ")\n",
midx, addr, mask, len);
tlb_flush_one_mmuidx_locked(env, midx, get_clock_realtime());
return;
}
/*
* Check if we need to flush due to large pages.
* Because large_page_mask contains all 1's from the msb,
* we only need to test the end of the range.
*/
if (((addr + len - 1) & d->large_page_mask) == d->large_page_addr) {
tlb_debug("forcing full flush midx %d ("
TARGET_FMT_lx "/" TARGET_FMT_lx ")\n",
midx, d->large_page_addr, d->large_page_mask);
tlb_flush_one_mmuidx_locked(env, midx, get_clock_realtime());
return;
}
for (target_ulong i = 0; i < len; i += TARGET_PAGE_SIZE) {
target_ulong page = addr + i;
CPUTLBEntry *entry = tlb_entry(env, midx, page);
if (tlb_flush_entry_mask_locked(entry, page, mask)) {
tlb_n_used_entries_dec(env, midx);
}
tlb_flush_vtlb_page_mask_locked(env, midx, page, mask);
}
}
typedef struct {
target_ulong addr;
target_ulong len;
uint16_t idxmap;
uint16_t bits;
} TLBFlushRangeData;
static void tlb_flush_range_by_mmuidx_async_0(CPUState *cpu,
TLBFlushRangeData d)
{
CPUArchState *env = cpu->env_ptr;
int mmu_idx;
assert_cpu_is_self(cpu);
tlb_debug("range:" TARGET_FMT_lx "/%u+" TARGET_FMT_lx " mmu_map:0x%x\n",
d.addr, d.bits, d.len, d.idxmap);
qemu_spin_lock(&env_tlb(env)->c.lock);
for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) {
if ((d.idxmap >> mmu_idx) & 1) {
tlb_flush_range_locked(env, mmu_idx, d.addr, d.len, d.bits);
}
}
qemu_spin_unlock(&env_tlb(env)->c.lock);
/*
* If the length is larger than the jump cache size, then it will take
* longer to clear each entry individually than it will to clear it all.
*/
if (d.len >= (TARGET_PAGE_SIZE * TB_JMP_CACHE_SIZE)) {
cpu_tb_jmp_cache_clear(cpu);
return;
}
for (target_ulong i = 0; i < d.len; i += TARGET_PAGE_SIZE) {
tb_flush_jmp_cache(cpu, d.addr + i);
}
}
static void tlb_flush_range_by_mmuidx_async_1(CPUState *cpu,
run_on_cpu_data data)
{
TLBFlushRangeData *d = data.host_ptr;
tlb_flush_range_by_mmuidx_async_0(cpu, *d);
g_free(d);
}
void tlb_flush_range_by_mmuidx(CPUState *cpu, target_ulong addr,
target_ulong len, uint16_t idxmap,
unsigned bits)
{
TLBFlushRangeData d;
/*
* If all bits are significant, and len is small,
* this devolves to tlb_flush_page.
*/
if (bits >= TARGET_LONG_BITS && len <= TARGET_PAGE_SIZE) {
tlb_flush_page_by_mmuidx(cpu, addr, idxmap);
return;
}
/* If no page bits are significant, this devolves to tlb_flush. */
if (bits < TARGET_PAGE_BITS) {
tlb_flush_by_mmuidx(cpu, idxmap);
return;
}
/* This should already be page aligned */
d.addr = addr & TARGET_PAGE_MASK;
d.len = len;
d.idxmap = idxmap;
d.bits = bits;
if (qemu_cpu_is_self(cpu)) {
tlb_flush_range_by_mmuidx_async_0(cpu, d);
} else {
/* Otherwise allocate a structure, freed by the worker. */
TLBFlushRangeData *p = g_memdup(&d, sizeof(d));
async_run_on_cpu(cpu, tlb_flush_range_by_mmuidx_async_1,
RUN_ON_CPU_HOST_PTR(p));
}
}
void tlb_flush_page_bits_by_mmuidx(CPUState *cpu, target_ulong addr,
uint16_t idxmap, unsigned bits)
{
tlb_flush_range_by_mmuidx(cpu, addr, TARGET_PAGE_SIZE, idxmap, bits);
}
void tlb_flush_range_by_mmuidx_all_cpus(CPUState *src_cpu,
target_ulong addr, target_ulong len,
uint16_t idxmap, unsigned bits)
{
TLBFlushRangeData d;
CPUState *dst_cpu;
/*
* If all bits are significant, and len is small,
* this devolves to tlb_flush_page.
*/
if (bits >= TARGET_LONG_BITS && len <= TARGET_PAGE_SIZE) {
tlb_flush_page_by_mmuidx_all_cpus(src_cpu, addr, idxmap);
return;
}
/* If no page bits are significant, this devolves to tlb_flush. */
if (bits < TARGET_PAGE_BITS) {
tlb_flush_by_mmuidx_all_cpus(src_cpu, idxmap);
return;
}
/* This should already be page aligned */
d.addr = addr & TARGET_PAGE_MASK;
d.len = len;
d.idxmap = idxmap;
d.bits = bits;
/* Allocate a separate data block for each destination cpu. */
CPU_FOREACH(dst_cpu) {
if (dst_cpu != src_cpu) {
TLBFlushRangeData *p = g_memdup(&d, sizeof(d));
async_run_on_cpu(dst_cpu,
tlb_flush_range_by_mmuidx_async_1,
RUN_ON_CPU_HOST_PTR(p));
}
}
tlb_flush_range_by_mmuidx_async_0(src_cpu, d);
}
void tlb_flush_page_bits_by_mmuidx_all_cpus(CPUState *src_cpu,
target_ulong addr,
uint16_t idxmap, unsigned bits)
{
tlb_flush_range_by_mmuidx_all_cpus(src_cpu, addr, TARGET_PAGE_SIZE,
idxmap, bits);
}
void tlb_flush_range_by_mmuidx_all_cpus_synced(CPUState *src_cpu,
target_ulong addr,
target_ulong len,
uint16_t idxmap,
unsigned bits)
{
TLBFlushRangeData d, *p;
CPUState *dst_cpu;
/*
* If all bits are significant, and len is small,
* this devolves to tlb_flush_page.
*/
if (bits >= TARGET_LONG_BITS && len <= TARGET_PAGE_SIZE) {
tlb_flush_page_by_mmuidx_all_cpus_synced(src_cpu, addr, idxmap);
return;
}
/* If no page bits are significant, this devolves to tlb_flush. */
if (bits < TARGET_PAGE_BITS) {
tlb_flush_by_mmuidx_all_cpus_synced(src_cpu, idxmap);
return;
}
/* This should already be page aligned */
d.addr = addr & TARGET_PAGE_MASK;
d.len = len;
d.idxmap = idxmap;
d.bits = bits;
/* Allocate a separate data block for each destination cpu. */
CPU_FOREACH(dst_cpu) {
if (dst_cpu != src_cpu) {
p = g_memdup(&d, sizeof(d));
async_run_on_cpu(dst_cpu, tlb_flush_range_by_mmuidx_async_1,
RUN_ON_CPU_HOST_PTR(p));
}
}
p = g_memdup(&d, sizeof(d));
async_safe_run_on_cpu(src_cpu, tlb_flush_range_by_mmuidx_async_1,
RUN_ON_CPU_HOST_PTR(p));
}
void tlb_flush_page_bits_by_mmuidx_all_cpus_synced(CPUState *src_cpu,
target_ulong addr,
uint16_t idxmap,
unsigned bits)
{
tlb_flush_range_by_mmuidx_all_cpus_synced(src_cpu, addr, TARGET_PAGE_SIZE,
idxmap, bits);
}
/* update the TLBs so that writes to code in the virtual page 'addr'
can be detected */
void tlb_protect_code(ram_addr_t ram_addr)
{
cpu_physical_memory_test_and_clear_dirty(ram_addr, TARGET_PAGE_SIZE,
DIRTY_MEMORY_CODE);
}
/* update the TLB so that writes in physical page 'phys_addr' are no longer
tested for self modifying code */
void tlb_unprotect_code(ram_addr_t ram_addr)
{
cpu_physical_memory_set_dirty_flag(ram_addr, DIRTY_MEMORY_CODE);
}
/*
* Dirty write flag handling
*
* When the TCG code writes to a location it looks up the address in
* the TLB and uses that data to compute the final address. If any of
* the lower bits of the address are set then the slow path is forced.
* There are a number of reasons to do this but for normal RAM the
* most usual is detecting writes to code regions which may invalidate
* generated code.
*
* Other vCPUs might be reading their TLBs during guest execution, so we update
* te->addr_write with qatomic_set. We don't need to worry about this for
* oversized guests as MTTCG is disabled for them.
*
* Called with tlb_c.lock held.
*/
static void tlb_reset_dirty_range_locked(CPUTLBEntry *tlb_entry,
uintptr_t start, uintptr_t length)
{
uintptr_t addr = tlb_entry->addr_write;
if ((addr & (TLB_INVALID_MASK | TLB_MMIO |
TLB_DISCARD_WRITE | TLB_NOTDIRTY)) == 0) {
addr &= TARGET_PAGE_MASK;
addr += tlb_entry->addend;
if ((addr - start) < length) {
#if TCG_OVERSIZED_GUEST
tlb_entry->addr_write |= TLB_NOTDIRTY;
#else
qatomic_set(&tlb_entry->addr_write,
tlb_entry->addr_write | TLB_NOTDIRTY);
#endif
}
}
}
/*
* Called with tlb_c.lock held.
* Called only from the vCPU context, i.e. the TLB's owner thread.
*/
static inline void copy_tlb_helper_locked(CPUTLBEntry *d, const CPUTLBEntry *s)
{
*d = *s;
}
/* This is a cross vCPU call (i.e. another vCPU resetting the flags of
* the target vCPU).
* We must take tlb_c.lock to avoid racing with another vCPU update. The only
* thing actually updated is the target TLB entry ->addr_write flags.
*/
void tlb_reset_dirty(CPUState *cpu, ram_addr_t start1, ram_addr_t length)
{
CPUArchState *env;
int mmu_idx;
env = cpu->env_ptr;
qemu_spin_lock(&env_tlb(env)->c.lock);
for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) {
unsigned int i;
unsigned int n = tlb_n_entries(&env_tlb(env)->f[mmu_idx]);
for (i = 0; i < n; i++) {
tlb_reset_dirty_range_locked(&env_tlb(env)->f[mmu_idx].table[i],
start1, length);
}
for (i = 0; i < CPU_VTLB_SIZE; i++) {
tlb_reset_dirty_range_locked(&env_tlb(env)->d[mmu_idx].vtable[i],
start1, length);
}
}
qemu_spin_unlock(&env_tlb(env)->c.lock);
}
/* Called with tlb_c.lock held */
static inline void tlb_set_dirty1_locked(CPUTLBEntry *tlb_entry,
target_ulong vaddr)
{
if (tlb_entry->addr_write == (vaddr | TLB_NOTDIRTY)) {
tlb_entry->addr_write = vaddr;
}
}
/* update the TLB corresponding to virtual page vaddr
so that it is no longer dirty */
void tlb_set_dirty(CPUState *cpu, target_ulong vaddr)
{
CPUArchState *env = cpu->env_ptr;
int mmu_idx;
assert_cpu_is_self(cpu);
vaddr &= TARGET_PAGE_MASK;
qemu_spin_lock(&env_tlb(env)->c.lock);
for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) {
tlb_set_dirty1_locked(tlb_entry(env, mmu_idx, vaddr), vaddr);
}
for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) {
int k;
for (k = 0; k < CPU_VTLB_SIZE; k++) {
tlb_set_dirty1_locked(&env_tlb(env)->d[mmu_idx].vtable[k], vaddr);
}
}
qemu_spin_unlock(&env_tlb(env)->c.lock);
}
/* Our TLB does not support large pages, so remember the area covered by
large pages and trigger a full TLB flush if these are invalidated. */
static void tlb_add_large_page(CPUArchState *env, int mmu_idx,
target_ulong vaddr, target_ulong size)
{
target_ulong lp_addr = env_tlb(env)->d[mmu_idx].large_page_addr;
target_ulong lp_mask = ~(size - 1);
if (lp_addr == (target_ulong)-1) {
/* No previous large page. */
lp_addr = vaddr;
} else {
/* Extend the existing region to include the new page.
This is a compromise between unnecessary flushes and
the cost of maintaining a full variable size TLB. */
lp_mask &= env_tlb(env)->d[mmu_idx].large_page_mask;
while (((lp_addr ^ vaddr) & lp_mask) != 0) {
lp_mask <<= 1;
}
}
env_tlb(env)->d[mmu_idx].large_page_addr = lp_addr & lp_mask;
env_tlb(env)->d[mmu_idx].large_page_mask = lp_mask;
}
/* Add a new TLB entry. At most one entry for a given virtual address
* is permitted. Only a single TARGET_PAGE_SIZE region is mapped, the
* supplied size is only used by tlb_flush_page.
*
* Called from TCG-generated code, which is under an RCU read-side
* critical section.
*/
void tlb_set_page_with_attrs(CPUState *cpu, target_ulong vaddr,
hwaddr paddr, MemTxAttrs attrs, int prot,
int mmu_idx, target_ulong size)
{
CPUArchState *env = cpu->env_ptr;
CPUTLB *tlb = env_tlb(env);
CPUTLBDesc *desc = &tlb->d[mmu_idx];
MemoryRegionSection *section;
unsigned int index;
target_ulong address;
target_ulong write_address;
uintptr_t addend;
CPUTLBEntry *te, tn;
hwaddr iotlb, xlat, sz, paddr_page;
target_ulong vaddr_page;
int asidx = cpu_asidx_from_attrs(cpu, attrs);
int wp_flags;
bool is_ram, is_romd;
assert_cpu_is_self(cpu);
if (size <= TARGET_PAGE_SIZE) {
sz = TARGET_PAGE_SIZE;
} else {
tlb_add_large_page(env, mmu_idx, vaddr, size);
sz = size;
}
vaddr_page = vaddr & TARGET_PAGE_MASK;
paddr_page = paddr & TARGET_PAGE_MASK;
section = address_space_translate_for_iotlb(cpu, asidx, paddr_page,
&xlat, &sz, attrs, &prot);
assert(sz >= TARGET_PAGE_SIZE);
tlb_debug("vaddr=" TARGET_FMT_lx " paddr=0x" TARGET_FMT_plx
" prot=%x idx=%d\n",
vaddr, paddr, prot, mmu_idx);
address = vaddr_page;
if (size < TARGET_PAGE_SIZE) {
/* Repeat the MMU check and TLB fill on every access. */
address |= TLB_INVALID_MASK;
}
if (attrs.byte_swap) {
address |= TLB_BSWAP;
}
is_ram = memory_region_is_ram(section->mr);
is_romd = memory_region_is_romd(section->mr);
if (is_ram || is_romd) {
/* RAM and ROMD both have associated host memory. */
addend = (uintptr_t)memory_region_get_ram_ptr(section->mr) + xlat;
} else {
/* I/O does not; force the host address to NULL. */
addend = 0;
}
write_address = address;
if (is_ram) {
iotlb = memory_region_get_ram_addr(section->mr) + xlat;
/*
* Computing is_clean is expensive; avoid all that unless
* the page is actually writable.
*/
if (prot & PAGE_WRITE) {
if (section->readonly) {
write_address |= TLB_DISCARD_WRITE;
} else if (cpu_physical_memory_is_clean(iotlb)) {
write_address |= TLB_NOTDIRTY;
}
}
} else {
/* I/O or ROMD */
iotlb = memory_region_section_get_iotlb(cpu, section) + xlat;
/*
* Writes to romd devices must go through MMIO to enable write.
* Reads to romd devices go through the ram_ptr found above,
* but of course reads to I/O must go through MMIO.
*/
write_address |= TLB_MMIO;
if (!is_romd) {
address = write_address;
}
}
wp_flags = cpu_watchpoint_address_matches(cpu, vaddr_page,
TARGET_PAGE_SIZE);
index = tlb_index(env, mmu_idx, vaddr_page);
te = tlb_entry(env, mmu_idx, vaddr_page);
/*
* Hold the TLB lock for the rest of the function. We could acquire/release
* the lock several times in the function, but it is faster to amortize the
* acquisition cost by acquiring it just once. Note that this leads to
* a longer critical section, but this is not a concern since the TLB lock
* is unlikely to be contended.
*/
qemu_spin_lock(&tlb->c.lock);
/* Note that the tlb is no longer clean. */
tlb->c.dirty |= 1 << mmu_idx;
/* Make sure there's no cached translation for the new page. */
tlb_flush_vtlb_page_locked(env, mmu_idx, vaddr_page);
/*
* Only evict the old entry to the victim tlb if it's for a
* different page; otherwise just overwrite the stale data.
*/
if (!tlb_hit_page_anyprot(te, vaddr_page) && !tlb_entry_is_empty(te)) {
unsigned vidx = desc->vindex++ % CPU_VTLB_SIZE;
CPUTLBEntry *tv = &desc->vtable[vidx];
/* Evict the old entry into the victim tlb. */
copy_tlb_helper_locked(tv, te);
desc->viotlb[vidx] = desc->iotlb[index];
tlb_n_used_entries_dec(env, mmu_idx);
}
/* refill the tlb */
/*
* At this point iotlb contains a physical section number in the lower
* TARGET_PAGE_BITS, and either
* + the ram_addr_t of the page base of the target RAM (RAM)
* + the offset within section->mr of the page base (I/O, ROMD)
* We subtract the vaddr_page (which is page aligned and thus won't
* disturb the low bits) to give an offset which can be added to the
* (non-page-aligned) vaddr of the eventual memory access to get
* the MemoryRegion offset for the access. Note that the vaddr we
* subtract here is that of the page base, and not the same as the
* vaddr we add back in io_readx()/io_writex()/get_page_addr_code().
*/
desc->iotlb[index].addr = iotlb - vaddr_page;
desc->iotlb[index].attrs = attrs;
/* Now calculate the new entry */
tn.addend = addend - vaddr_page;
if (prot & PAGE_READ) {
tn.addr_read = address;
if (wp_flags & BP_MEM_READ) {
tn.addr_read |= TLB_WATCHPOINT;
}
} else {
tn.addr_read = -1;
}
if (prot & PAGE_EXEC) {
tn.addr_code = address;
} else {
tn.addr_code = -1;
}
tn.addr_write = -1;
if (prot & PAGE_WRITE) {
tn.addr_write = write_address;
if (prot & PAGE_WRITE_INV) {
tn.addr_write |= TLB_INVALID_MASK;
}
if (wp_flags & BP_MEM_WRITE) {
tn.addr_write |= TLB_WATCHPOINT;
}
}
copy_tlb_helper_locked(te, &tn);
tlb_n_used_entries_inc(env, mmu_idx);
qemu_spin_unlock(&tlb->c.lock);
}
/* Add a new TLB entry, but without specifying the memory
* transaction attributes to be used.
*/
void tlb_set_page(CPUState *cpu, target_ulong vaddr,
hwaddr paddr, int prot,
int mmu_idx, target_ulong size)
{
tlb_set_page_with_attrs(cpu, vaddr, paddr, MEMTXATTRS_UNSPECIFIED,
prot, mmu_idx, size);
}
static inline ram_addr_t qemu_ram_addr_from_host_nofail(void *ptr)
{
ram_addr_t ram_addr;
ram_addr = qemu_ram_addr_from_host(ptr);
if (ram_addr == RAM_ADDR_INVALID) {
error_report("Bad ram pointer %p", ptr);
abort();
}
return ram_addr;
}
/*
* Note: tlb_fill() can trigger a resize of the TLB. This means that all of the
* caller's prior references to the TLB table (e.g. CPUTLBEntry pointers) must
* be discarded and looked up again (e.g. via tlb_entry()).
*/
static void tlb_fill(CPUState *cpu, target_ulong addr, int size,
MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
bool ok;
/*
* This is not a probe, so only valid return is success; failure
* should result in exception + longjmp to the cpu loop.
*/
ok = cc->tcg_ops->tlb_fill(cpu, addr, size,
access_type, mmu_idx, false, retaddr);
assert(ok);
}
static inline void cpu_unaligned_access(CPUState *cpu, vaddr addr,
MMUAccessType access_type,
int mmu_idx, uintptr_t retaddr)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
cc->tcg_ops->do_unaligned_access(cpu, addr, access_type, mmu_idx, retaddr);
}
static inline void cpu_transaction_failed(CPUState *cpu, hwaddr physaddr,
vaddr addr, unsigned size,
MMUAccessType access_type,
int mmu_idx, MemTxAttrs attrs,
MemTxResult response,
uintptr_t retaddr)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
if (!cpu->ignore_memory_transaction_failures &&
cc->tcg_ops->do_transaction_failed) {
cc->tcg_ops->do_transaction_failed(cpu, physaddr, addr, size,
access_type, mmu_idx, attrs,
response, retaddr);
}
}
static uint64_t io_readx(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
int mmu_idx, target_ulong addr, uintptr_t retaddr,
MMUAccessType access_type, MemOp op)
{
CPUState *cpu = env_cpu(env);
hwaddr mr_offset;
MemoryRegionSection *section;
MemoryRegion *mr;
uint64_t val;
bool locked = false;
MemTxResult r;
section = iotlb_to_section(cpu, iotlbentry->addr, iotlbentry->attrs);
mr = section->mr;
mr_offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
cpu->mem_io_pc = retaddr;
if (!cpu->can_do_io) {
cpu_io_recompile(cpu, retaddr);
}
if (!qemu_mutex_iothread_locked()) {
qemu_mutex_lock_iothread();
locked = true;
}
r = memory_region_dispatch_read(mr, mr_offset, &val, op, iotlbentry->attrs);
if (r != MEMTX_OK) {
hwaddr physaddr = mr_offset +
section->offset_within_address_space -
section->offset_within_region;
cpu_transaction_failed(cpu, physaddr, addr, memop_size(op), access_type,
mmu_idx, iotlbentry->attrs, r, retaddr);
}
if (locked) {
qemu_mutex_unlock_iothread();
}
return val;
}
/*
* Save a potentially trashed IOTLB entry for later lookup by plugin.
* This is read by tlb_plugin_lookup if the iotlb entry doesn't match
* because of the side effect of io_writex changing memory layout.
*/
static void save_iotlb_data(CPUState *cs, hwaddr addr,
MemoryRegionSection *section, hwaddr mr_offset)
{
#ifdef CONFIG_PLUGIN
SavedIOTLB *saved = &cs->saved_iotlb;
saved->addr = addr;
saved->section = section;
saved->mr_offset = mr_offset;
#endif
}
static void io_writex(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
int mmu_idx, uint64_t val, target_ulong addr,
uintptr_t retaddr, MemOp op)
{
CPUState *cpu = env_cpu(env);
hwaddr mr_offset;
MemoryRegionSection *section;
MemoryRegion *mr;
bool locked = false;
MemTxResult r;
section = iotlb_to_section(cpu, iotlbentry->addr, iotlbentry->attrs);
mr = section->mr;
mr_offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
if (!cpu->can_do_io) {
cpu_io_recompile(cpu, retaddr);
}
cpu->mem_io_pc = retaddr;
/*
* The memory_region_dispatch may trigger a flush/resize
* so for plugins we save the iotlb_data just in case.
*/
save_iotlb_data(cpu, iotlbentry->addr, section, mr_offset);
if (!qemu_mutex_iothread_locked()) {
qemu_mutex_lock_iothread();
locked = true;
}
r = memory_region_dispatch_write(mr, mr_offset, val, op, iotlbentry->attrs);
if (r != MEMTX_OK) {
hwaddr physaddr = mr_offset +
section->offset_within_address_space -
section->offset_within_region;
cpu_transaction_failed(cpu, physaddr, addr, memop_size(op),
MMU_DATA_STORE, mmu_idx, iotlbentry->attrs, r,
retaddr);
}
if (locked) {
qemu_mutex_unlock_iothread();
}
}
static inline target_ulong tlb_read_ofs(CPUTLBEntry *entry, size_t ofs)
{
#if TCG_OVERSIZED_GUEST
return *(target_ulong *)((uintptr_t)entry + ofs);
#else
/* ofs might correspond to .addr_write, so use qatomic_read */
return qatomic_read((target_ulong *)((uintptr_t)entry + ofs));
#endif
}
/* Return true if ADDR is present in the victim tlb, and has been copied
back to the main tlb. */
static bool victim_tlb_hit(CPUArchState *env, size_t mmu_idx, size_t index,
size_t elt_ofs, target_ulong page)
{
size_t vidx;
assert_cpu_is_self(env_cpu(env));
for (vidx = 0; vidx < CPU_VTLB_SIZE; ++vidx) {
CPUTLBEntry *vtlb = &env_tlb(env)->d[mmu_idx].vtable[vidx];
target_ulong cmp;
/* elt_ofs might correspond to .addr_write, so use qatomic_read */
#if TCG_OVERSIZED_GUEST
cmp = *(target_ulong *)((uintptr_t)vtlb + elt_ofs);
#else
cmp = qatomic_read((target_ulong *)((uintptr_t)vtlb + elt_ofs));
#endif
if (cmp == page) {
/* Found entry in victim tlb, swap tlb and iotlb. */
CPUTLBEntry tmptlb, *tlb = &env_tlb(env)->f[mmu_idx].table[index];
qemu_spin_lock(&env_tlb(env)->c.lock);
copy_tlb_helper_locked(&tmptlb, tlb);
copy_tlb_helper_locked(tlb, vtlb);
copy_tlb_helper_locked(vtlb, &tmptlb);
qemu_spin_unlock(&env_tlb(env)->c.lock);
CPUIOTLBEntry tmpio, *io = &env_tlb(env)->d[mmu_idx].iotlb[index];
CPUIOTLBEntry *vio = &env_tlb(env)->d[mmu_idx].viotlb[vidx];
tmpio = *io; *io = *vio; *vio = tmpio;
return true;
}
}
return false;
}
/* Macro to call the above, with local variables from the use context. */
#define VICTIM_TLB_HIT(TY, ADDR) \
victim_tlb_hit(env, mmu_idx, index, offsetof(CPUTLBEntry, TY), \
(ADDR) & TARGET_PAGE_MASK)
/*
* Return a ram_addr_t for the virtual address for execution.
*
* Return -1 if we can't translate and execute from an entire page
* of RAM. This will force us to execute by loading and translating
* one insn at a time, without caching.
*
* NOTE: This function will trigger an exception if the page is
* not executable.
*/
tb_page_addr_t get_page_addr_code_hostp(CPUArchState *env, target_ulong addr,
void **hostp)
{
uintptr_t mmu_idx = cpu_mmu_index(env, true);
uintptr_t index = tlb_index(env, mmu_idx, addr);
CPUTLBEntry *entry = tlb_entry(env, mmu_idx, addr);
void *p;
if (unlikely(!tlb_hit(entry->addr_code, addr))) {
if (!VICTIM_TLB_HIT(addr_code, addr)) {
tlb_fill(env_cpu(env), addr, 0, MMU_INST_FETCH, mmu_idx, 0);
index = tlb_index(env, mmu_idx, addr);
entry = tlb_entry(env, mmu_idx, addr);
if (unlikely(entry->addr_code & TLB_INVALID_MASK)) {
/*
* The MMU protection covers a smaller range than a target
* page, so we must redo the MMU check for every insn.
*/
return -1;
}
}
assert(tlb_hit(entry->addr_code, addr));
}
if (unlikely(entry->addr_code & TLB_MMIO)) {
/* The region is not backed by RAM. */
if (hostp) {
*hostp = NULL;
}
return -1;
}
p = (void *)((uintptr_t)addr + entry->addend);
if (hostp) {
*hostp = p;
}
return qemu_ram_addr_from_host_nofail(p);
}
tb_page_addr_t get_page_addr_code(CPUArchState *env, target_ulong addr)
{
return get_page_addr_code_hostp(env, addr, NULL);
}
static void notdirty_write(CPUState *cpu, vaddr mem_vaddr, unsigned size,
CPUIOTLBEntry *iotlbentry, uintptr_t retaddr)
{
ram_addr_t ram_addr = mem_vaddr + iotlbentry->addr;
trace_memory_notdirty_write_access(mem_vaddr, ram_addr, size);
if (!cpu_physical_memory_get_dirty_flag(ram_addr, DIRTY_MEMORY_CODE)) {
struct page_collection *pages
= page_collection_lock(ram_addr, ram_addr + size);
tb_invalidate_phys_page_fast(pages, ram_addr, size, retaddr);
page_collection_unlock(pages);
}
/*
* Set both VGA and migration bits for simplicity and to remove
* the notdirty callback faster.
*/
cpu_physical_memory_set_dirty_range(ram_addr, size, DIRTY_CLIENTS_NOCODE);
/* We remove the notdirty callback only if the code has been flushed. */
if (!cpu_physical_memory_is_clean(ram_addr)) {
trace_memory_notdirty_set_dirty(mem_vaddr);
tlb_set_dirty(cpu, mem_vaddr);
}
}
static int probe_access_internal(CPUArchState *env, target_ulong addr,
int fault_size, MMUAccessType access_type,
int mmu_idx, bool nonfault,
void **phost, uintptr_t retaddr)
{
uintptr_t index = tlb_index(env, mmu_idx, addr);
CPUTLBEntry *entry = tlb_entry(env, mmu_idx, addr);
target_ulong tlb_addr, page_addr;
size_t elt_ofs;
int flags;
switch (access_type) {
case MMU_DATA_LOAD:
elt_ofs = offsetof(CPUTLBEntry, addr_read);
break;
case MMU_DATA_STORE:
elt_ofs = offsetof(CPUTLBEntry, addr_write);
break;
case MMU_INST_FETCH:
elt_ofs = offsetof(CPUTLBEntry, addr_code);
break;
default:
g_assert_not_reached();
}
tlb_addr = tlb_read_ofs(entry, elt_ofs);
page_addr = addr & TARGET_PAGE_MASK;
if (!tlb_hit_page(tlb_addr, page_addr)) {
if (!victim_tlb_hit(env, mmu_idx, index, elt_ofs, page_addr)) {
CPUState *cs = env_cpu(env);
CPUClass *cc = CPU_GET_CLASS(cs);
if (!cc->tcg_ops->tlb_fill(cs, addr, fault_size, access_type,
mmu_idx, nonfault, retaddr)) {
/* Non-faulting page table read failed. */
*phost = NULL;
return TLB_INVALID_MASK;
}
/* TLB resize via tlb_fill may have moved the entry. */
entry = tlb_entry(env, mmu_idx, addr);
}
tlb_addr = tlb_read_ofs(entry, elt_ofs);
}
flags = tlb_addr & TLB_FLAGS_MASK;
/* Fold all "mmio-like" bits into TLB_MMIO. This is not RAM. */
if (unlikely(flags & ~(TLB_WATCHPOINT | TLB_NOTDIRTY))) {
*phost = NULL;
return TLB_MMIO;
}
/* Everything else is RAM. */
*phost = (void *)((uintptr_t)addr + entry->addend);
return flags;
}
int probe_access_flags(CPUArchState *env, target_ulong addr,
MMUAccessType access_type, int mmu_idx,
bool nonfault, void **phost, uintptr_t retaddr)
{
int flags;
flags = probe_access_internal(env, addr, 0, access_type, mmu_idx,
nonfault, phost, retaddr);
/* Handle clean RAM pages. */
if (unlikely(flags & TLB_NOTDIRTY)) {
uintptr_t index = tlb_index(env, mmu_idx, addr);
CPUIOTLBEntry *iotlbentry = &env_tlb(env)->d[mmu_idx].iotlb[index];
notdirty_write(env_cpu(env), addr, 1, iotlbentry, retaddr);
flags &= ~TLB_NOTDIRTY;
}
return flags;
}
void *probe_access(CPUArchState *env, target_ulong addr, int size,
MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
{
void *host;
int flags;
g_assert(-(addr | TARGET_PAGE_MASK) >= size);
flags = probe_access_internal(env, addr, size, access_type, mmu_idx,
false, &host, retaddr);
/* Per the interface, size == 0 merely faults the access. */
if (size == 0) {
return NULL;
}
if (unlikely(flags & (TLB_NOTDIRTY | TLB_WATCHPOINT))) {
uintptr_t index = tlb_index(env, mmu_idx, addr);
CPUIOTLBEntry *iotlbentry = &env_tlb(env)->d[mmu_idx].iotlb[index];
/* Handle watchpoints. */
if (flags & TLB_WATCHPOINT) {
int wp_access = (access_type == MMU_DATA_STORE
? BP_MEM_WRITE : BP_MEM_READ);
cpu_check_watchpoint(env_cpu(env), addr, size,
iotlbentry->attrs, wp_access, retaddr);
}
/* Handle clean RAM pages. */
if (flags & TLB_NOTDIRTY) {
notdirty_write(env_cpu(env), addr, 1, iotlbentry, retaddr);
}
}
return host;
}
void *tlb_vaddr_to_host(CPUArchState *env, abi_ptr addr,
MMUAccessType access_type, int mmu_idx)
{
void *host;
int flags;
flags = probe_access_internal(env, addr, 0, access_type,
mmu_idx, true, &host, 0);
/* No combination of flags are expected by the caller. */
return flags ? NULL : host;
}
#ifdef CONFIG_PLUGIN
/*
* Perform a TLB lookup and populate the qemu_plugin_hwaddr structure.
* This should be a hot path as we will have just looked this path up
* in the softmmu lookup code (or helper). We don't handle re-fills or
* checking the victim table. This is purely informational.
*
* This almost never fails as the memory access being instrumented
* should have just filled the TLB. The one corner case is io_writex
* which can cause TLB flushes and potential resizing of the TLBs
* losing the information we need. In those cases we need to recover
* data from a copy of the iotlbentry. As long as this always occurs
* from the same thread (which a mem callback will be) this is safe.
*/
bool tlb_plugin_lookup(CPUState *cpu, target_ulong addr, int mmu_idx,
bool is_store, struct qemu_plugin_hwaddr *data)
{
CPUArchState *env = cpu->env_ptr;
CPUTLBEntry *tlbe = tlb_entry(env, mmu_idx, addr);
uintptr_t index = tlb_index(env, mmu_idx, addr);
target_ulong tlb_addr = is_store ? tlb_addr_write(tlbe) : tlbe->addr_read;
if (likely(tlb_hit(tlb_addr, addr))) {
/* We must have an iotlb entry for MMIO */
if (tlb_addr & TLB_MMIO) {
CPUIOTLBEntry *iotlbentry;
iotlbentry = &env_tlb(env)->d[mmu_idx].iotlb[index];
data->is_io = true;
data->v.io.section = iotlb_to_section(cpu, iotlbentry->addr, iotlbentry->attrs);
data->v.io.offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
} else {
data->is_io = false;
data->v.ram.hostaddr = (void *)((uintptr_t)addr + tlbe->addend);
}
return true;
} else {
SavedIOTLB *saved = &cpu->saved_iotlb;
data->is_io = true;
data->v.io.section = saved->section;
data->v.io.offset = saved->mr_offset;
return true;
}
}
#endif
/*
* Probe for an atomic operation. Do not allow unaligned operations,
* or io operations to proceed. Return the host address.
*
* @prot may be PAGE_READ, PAGE_WRITE, or PAGE_READ|PAGE_WRITE.
*/
static void *atomic_mmu_lookup(CPUArchState *env, target_ulong addr,
MemOpIdx oi, int size, int prot,
uintptr_t retaddr)
{
uintptr_t mmu_idx = get_mmuidx(oi);
MemOp mop = get_memop(oi);
int a_bits = get_alignment_bits(mop);
uintptr_t index;
CPUTLBEntry *tlbe;
target_ulong tlb_addr;
void *hostaddr;
tcg_debug_assert(mmu_idx < NB_MMU_MODES);
/* Adjust the given return address. */
retaddr -= GETPC_ADJ;
/* Enforce guest required alignment. */
if (unlikely(a_bits > 0 && (addr & ((1 << a_bits) - 1)))) {
/* ??? Maybe indicate atomic op to cpu_unaligned_access */
cpu_unaligned_access(env_cpu(env), addr, MMU_DATA_STORE,
mmu_idx, retaddr);
}
/* Enforce qemu required alignment. */
if (unlikely(addr & (size - 1))) {
/* We get here if guest alignment was not requested,
or was not enforced by cpu_unaligned_access above.
We might widen the access and emulate, but for now
mark an exception and exit the cpu loop. */
goto stop_the_world;
}
index = tlb_index(env, mmu_idx, addr);
tlbe = tlb_entry(env, mmu_idx, addr);
/* Check TLB entry and enforce page permissions. */
if (prot & PAGE_WRITE) {
tlb_addr = tlb_addr_write(tlbe);
if (!tlb_hit(tlb_addr, addr)) {
if (!VICTIM_TLB_HIT(addr_write, addr)) {
tlb_fill(env_cpu(env), addr, size,
MMU_DATA_STORE, mmu_idx, retaddr);
index = tlb_index(env, mmu_idx, addr);
tlbe = tlb_entry(env, mmu_idx, addr);
}
tlb_addr = tlb_addr_write(tlbe) & ~TLB_INVALID_MASK;
}
/* Let the guest notice RMW on a write-only page. */
if ((prot & PAGE_READ) &&
unlikely(tlbe->addr_read != (tlb_addr & ~TLB_NOTDIRTY))) {
tlb_fill(env_cpu(env), addr, size,
MMU_DATA_LOAD, mmu_idx, retaddr);
/*
* Since we don't support reads and writes to different addresses,
* and we do have the proper page loaded for write, this shouldn't
* ever return. But just in case, handle via stop-the-world.
*/
goto stop_the_world;
}
} else /* if (prot & PAGE_READ) */ {
tlb_addr = tlbe->addr_read;
if (!tlb_hit(tlb_addr, addr)) {
if (!VICTIM_TLB_HIT(addr_write, addr)) {
tlb_fill(env_cpu(env), addr, size,
MMU_DATA_LOAD, mmu_idx, retaddr);
index = tlb_index(env, mmu_idx, addr);
tlbe = tlb_entry(env, mmu_idx, addr);
}
tlb_addr = tlbe->addr_read & ~TLB_INVALID_MASK;
}
}
/* Notice an IO access or a needs-MMU-lookup access */
if (unlikely(tlb_addr & TLB_MMIO)) {
/* There's really nothing that can be done to
support this apart from stop-the-world. */
goto stop_the_world;
}
hostaddr = (void *)((uintptr_t)addr + tlbe->addend);
if (unlikely(tlb_addr & TLB_NOTDIRTY)) {
notdirty_write(env_cpu(env), addr, size,
&env_tlb(env)->d[mmu_idx].iotlb[index], retaddr);
}
return hostaddr;
stop_the_world:
cpu_loop_exit_atomic(env_cpu(env), retaddr);
}
/*
* Verify that we have passed the correct MemOp to the correct function.
*
* In the case of the helper_*_mmu functions, we will have done this by
* using the MemOp to look up the helper during code generation.
*
* In the case of the cpu_*_mmu functions, this is up to the caller.
* We could present one function to target code, and dispatch based on
* the MemOp, but so far we have worked hard to avoid an indirect function
* call along the memory path.
*/
static void validate_memop(MemOpIdx oi, MemOp expected)
{
#ifdef CONFIG_DEBUG_TCG
MemOp have = get_memop(oi) & (MO_SIZE | MO_BSWAP);
assert(have == expected);
#endif
}
/*
* Load Helpers
*
* We support two different access types. SOFTMMU_CODE_ACCESS is
* specifically for reading instructions from system memory. It is
* called by the translation loop and in some helpers where the code
* is disassembled. It shouldn't be called directly by guest code.
*/
typedef uint64_t FullLoadHelper(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr);
static inline uint64_t QEMU_ALWAYS_INLINE
load_memop(const void *haddr, MemOp op)
{
switch (op) {
case MO_UB:
return ldub_p(haddr);
case MO_BEUW:
return lduw_be_p(haddr);
case MO_LEUW:
return lduw_le_p(haddr);
case MO_BEUL:
return (uint32_t)ldl_be_p(haddr);
case MO_LEUL:
return (uint32_t)ldl_le_p(haddr);
case MO_BEUQ:
return ldq_be_p(haddr);
case MO_LEUQ:
return ldq_le_p(haddr);
default:
qemu_build_not_reached();
}
}
static inline uint64_t QEMU_ALWAYS_INLINE
load_helper(CPUArchState *env, target_ulong addr, MemOpIdx oi,
uintptr_t retaddr, MemOp op, bool code_read,
FullLoadHelper *full_load)
{
const size_t tlb_off = code_read ?
offsetof(CPUTLBEntry, addr_code) : offsetof(CPUTLBEntry, addr_read);
const MMUAccessType access_type =
code_read ? MMU_INST_FETCH : MMU_DATA_LOAD;
const unsigned a_bits = get_alignment_bits(get_memop(oi));
const size_t size = memop_size(op);
uintptr_t mmu_idx = get_mmuidx(oi);
uintptr_t index;
CPUTLBEntry *entry;
target_ulong tlb_addr;
void *haddr;
uint64_t res;
tcg_debug_assert(mmu_idx < NB_MMU_MODES);
/* Handle CPU specific unaligned behaviour */
if (addr & ((1 << a_bits) - 1)) {
cpu_unaligned_access(env_cpu(env), addr, access_type,
mmu_idx, retaddr);
}
index = tlb_index(env, mmu_idx, addr);
entry = tlb_entry(env, mmu_idx, addr);
tlb_addr = code_read ? entry->addr_code : entry->addr_read;
/* If the TLB entry is for a different page, reload and try again. */
if (!tlb_hit(tlb_addr, addr)) {
if (!victim_tlb_hit(env, mmu_idx, index, tlb_off,
addr & TARGET_PAGE_MASK)) {
tlb_fill(env_cpu(env), addr, size,
access_type, mmu_idx, retaddr);
index = tlb_index(env, mmu_idx, addr);
entry = tlb_entry(env, mmu_idx, addr);
}
tlb_addr = code_read ? entry->addr_code : entry->addr_read;
tlb_addr &= ~TLB_INVALID_MASK;
}
/* Handle anything that isn't just a straight memory access. */
if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
CPUIOTLBEntry *iotlbentry;
bool need_swap;
/* For anything that is unaligned, recurse through full_load. */
if ((addr & (size - 1)) != 0) {
goto do_unaligned_access;
}
iotlbentry = &env_tlb(env)->d[mmu_idx].iotlb[index];
/* Handle watchpoints. */
if (unlikely(tlb_addr & TLB_WATCHPOINT)) {
/* On watchpoint hit, this will longjmp out. */
cpu_check_watchpoint(env_cpu(env), addr, size,
iotlbentry->attrs, BP_MEM_READ, retaddr);
}
need_swap = size > 1 && (tlb_addr & TLB_BSWAP);
/* Handle I/O access. */
if (likely(tlb_addr & TLB_MMIO)) {
return io_readx(env, iotlbentry, mmu_idx, addr, retaddr,
access_type, op ^ (need_swap * MO_BSWAP));
}
haddr = (void *)((uintptr_t)addr + entry->addend);
/*
* Keep these two load_memop separate to ensure that the compiler
* is able to fold the entire function to a single instruction.
* There is a build-time assert inside to remind you of this. ;-)
*/
if (unlikely(need_swap)) {
return load_memop(haddr, op ^ MO_BSWAP);
}
return load_memop(haddr, op);
}
/* Handle slow unaligned access (it spans two pages or IO). */
if (size > 1
&& unlikely((addr & ~TARGET_PAGE_MASK) + size - 1
>= TARGET_PAGE_SIZE)) {
target_ulong addr1, addr2;
uint64_t r1, r2;
unsigned shift;
do_unaligned_access:
addr1 = addr & ~((target_ulong)size - 1);
addr2 = addr1 + size;
r1 = full_load(env, addr1, oi, retaddr);
r2 = full_load(env, addr2, oi, retaddr);
shift = (addr & (size - 1)) * 8;
if (memop_big_endian(op)) {
/* Big-endian combine. */
res = (r1 << shift) | (r2 >> ((size * 8) - shift));
} else {
/* Little-endian combine. */
res = (r1 >> shift) | (r2 << ((size * 8) - shift));
}
return res & MAKE_64BIT_MASK(0, size * 8);
}
haddr = (void *)((uintptr_t)addr + entry->addend);
return load_memop(haddr, op);
}
/*
* For the benefit of TCG generated code, we want to avoid the
* complication of ABI-specific return type promotion and always
* return a value extended to the register size of the host. This is
* tcg_target_long, except in the case of a 32-bit host and 64-bit
* data, and for that we always have uint64_t.
*
* We don't bother with this widened value for SOFTMMU_CODE_ACCESS.
*/
static uint64_t full_ldub_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_UB);
return load_helper(env, addr, oi, retaddr, MO_UB, false, full_ldub_mmu);
}
tcg_target_ulong helper_ret_ldub_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return full_ldub_mmu(env, addr, oi, retaddr);
}
static uint64_t full_le_lduw_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_LEUW);
return load_helper(env, addr, oi, retaddr, MO_LEUW, false,
full_le_lduw_mmu);
}
tcg_target_ulong helper_le_lduw_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return full_le_lduw_mmu(env, addr, oi, retaddr);
}
static uint64_t full_be_lduw_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_BEUW);
return load_helper(env, addr, oi, retaddr, MO_BEUW, false,
full_be_lduw_mmu);
}
tcg_target_ulong helper_be_lduw_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return full_be_lduw_mmu(env, addr, oi, retaddr);
}
static uint64_t full_le_ldul_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_LEUL);
return load_helper(env, addr, oi, retaddr, MO_LEUL, false,
full_le_ldul_mmu);
}
tcg_target_ulong helper_le_ldul_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return full_le_ldul_mmu(env, addr, oi, retaddr);
}
static uint64_t full_be_ldul_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_BEUL);
return load_helper(env, addr, oi, retaddr, MO_BEUL, false,
full_be_ldul_mmu);
}
tcg_target_ulong helper_be_ldul_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return full_be_ldul_mmu(env, addr, oi, retaddr);
}
uint64_t helper_le_ldq_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_LEUQ);
return load_helper(env, addr, oi, retaddr, MO_LEUQ, false,
helper_le_ldq_mmu);
}
uint64_t helper_be_ldq_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_BEUQ);
return load_helper(env, addr, oi, retaddr, MO_BEUQ, false,
helper_be_ldq_mmu);
}
/*
* Provide signed versions of the load routines as well. We can of course
* avoid this for 64-bit data, or for 32-bit data on 32-bit host.
*/
tcg_target_ulong helper_ret_ldsb_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return (int8_t)helper_ret_ldub_mmu(env, addr, oi, retaddr);
}
tcg_target_ulong helper_le_ldsw_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return (int16_t)helper_le_lduw_mmu(env, addr, oi, retaddr);
}
tcg_target_ulong helper_be_ldsw_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return (int16_t)helper_be_lduw_mmu(env, addr, oi, retaddr);
}
tcg_target_ulong helper_le_ldsl_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return (int32_t)helper_le_ldul_mmu(env, addr, oi, retaddr);
}
tcg_target_ulong helper_be_ldsl_mmu(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return (int32_t)helper_be_ldul_mmu(env, addr, oi, retaddr);
}
/*
* Load helpers for cpu_ldst.h.
*/
static inline uint64_t cpu_load_helper(CPUArchState *env, abi_ptr addr,
MemOpIdx oi, uintptr_t retaddr,
FullLoadHelper *full_load)
{
uint64_t ret;
ret = full_load(env, addr, oi, retaddr);
qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_R);
return ret;
}
uint8_t cpu_ldb_mmu(CPUArchState *env, abi_ptr addr, MemOpIdx oi, uintptr_t ra)
{
return cpu_load_helper(env, addr, oi, ra, full_ldub_mmu);
}
uint16_t cpu_ldw_be_mmu(CPUArchState *env, abi_ptr addr,
MemOpIdx oi, uintptr_t ra)
{
return cpu_load_helper(env, addr, oi, ra, full_be_lduw_mmu);
}
uint32_t cpu_ldl_be_mmu(CPUArchState *env, abi_ptr addr,
MemOpIdx oi, uintptr_t ra)
{
return cpu_load_helper(env, addr, oi, ra, full_be_ldul_mmu);
}
uint64_t cpu_ldq_be_mmu(CPUArchState *env, abi_ptr addr,
MemOpIdx oi, uintptr_t ra)
{
return cpu_load_helper(env, addr, oi, ra, helper_be_ldq_mmu);
}
uint16_t cpu_ldw_le_mmu(CPUArchState *env, abi_ptr addr,
MemOpIdx oi, uintptr_t ra)
{
return cpu_load_helper(env, addr, oi, ra, full_le_lduw_mmu);
}
uint32_t cpu_ldl_le_mmu(CPUArchState *env, abi_ptr addr,
MemOpIdx oi, uintptr_t ra)
{
return cpu_load_helper(env, addr, oi, ra, full_le_ldul_mmu);
}
uint64_t cpu_ldq_le_mmu(CPUArchState *env, abi_ptr addr,
MemOpIdx oi, uintptr_t ra)
{
return cpu_load_helper(env, addr, oi, ra, helper_le_ldq_mmu);
}
/*
* Store Helpers
*/
static inline void QEMU_ALWAYS_INLINE
store_memop(void *haddr, uint64_t val, MemOp op)
{
switch (op) {
case MO_UB:
stb_p(haddr, val);
break;
case MO_BEUW:
stw_be_p(haddr, val);
break;
case MO_LEUW:
stw_le_p(haddr, val);
break;
case MO_BEUL:
stl_be_p(haddr, val);
break;
case MO_LEUL:
stl_le_p(haddr, val);
break;
case MO_BEUQ:
stq_be_p(haddr, val);
break;
case MO_LEUQ:
stq_le_p(haddr, val);
break;
default:
qemu_build_not_reached();
}
}
static void full_stb_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr);
static void __attribute__((noinline))
store_helper_unaligned(CPUArchState *env, target_ulong addr, uint64_t val,
uintptr_t retaddr, size_t size, uintptr_t mmu_idx,
bool big_endian)
{
const size_t tlb_off = offsetof(CPUTLBEntry, addr_write);
uintptr_t index, index2;
CPUTLBEntry *entry, *entry2;
target_ulong page1, page2, tlb_addr, tlb_addr2;
MemOpIdx oi;
size_t size2;
int i;
/*
* Ensure the second page is in the TLB. Note that the first page
* is already guaranteed to be filled, and that the second page
* cannot evict the first. An exception to this rule is PAGE_WRITE_INV
* handling: the first page could have evicted itself.
*/
page1 = addr & TARGET_PAGE_MASK;
page2 = (addr + size) & TARGET_PAGE_MASK;
size2 = (addr + size) & ~TARGET_PAGE_MASK;
index2 = tlb_index(env, mmu_idx, page2);
entry2 = tlb_entry(env, mmu_idx, page2);
tlb_addr2 = tlb_addr_write(entry2);
if (page1 != page2 && !tlb_hit_page(tlb_addr2, page2)) {
if (!victim_tlb_hit(env, mmu_idx, index2, tlb_off, page2)) {
tlb_fill(env_cpu(env), page2, size2, MMU_DATA_STORE,
mmu_idx, retaddr);
index2 = tlb_index(env, mmu_idx, page2);
entry2 = tlb_entry(env, mmu_idx, page2);
}
tlb_addr2 = tlb_addr_write(entry2);
}
index = tlb_index(env, mmu_idx, addr);
entry = tlb_entry(env, mmu_idx, addr);
tlb_addr = tlb_addr_write(entry);
/*
* Handle watchpoints. Since this may trap, all checks
* must happen before any store.
*/
if (unlikely(tlb_addr & TLB_WATCHPOINT)) {
cpu_check_watchpoint(env_cpu(env), addr, size - size2,
env_tlb(env)->d[mmu_idx].iotlb[index].attrs,
BP_MEM_WRITE, retaddr);
}
if (unlikely(tlb_addr2 & TLB_WATCHPOINT)) {
cpu_check_watchpoint(env_cpu(env), page2, size2,
env_tlb(env)->d[mmu_idx].iotlb[index2].attrs,
BP_MEM_WRITE, retaddr);
}
/*
* XXX: not efficient, but simple.
* This loop must go in the forward direction to avoid issues
* with self-modifying code in Windows 64-bit.
*/
oi = make_memop_idx(MO_UB, mmu_idx);
if (big_endian) {
for (i = 0; i < size; ++i) {
/* Big-endian extract. */
uint8_t val8 = val >> (((size - 1) * 8) - (i * 8));
full_stb_mmu(env, addr + i, val8, oi, retaddr);
}
} else {
for (i = 0; i < size; ++i) {
/* Little-endian extract. */
uint8_t val8 = val >> (i * 8);
full_stb_mmu(env, addr + i, val8, oi, retaddr);
}
}
}
static inline void QEMU_ALWAYS_INLINE
store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr, MemOp op)
{
const size_t tlb_off = offsetof(CPUTLBEntry, addr_write);
const unsigned a_bits = get_alignment_bits(get_memop(oi));
const size_t size = memop_size(op);
uintptr_t mmu_idx = get_mmuidx(oi);
uintptr_t index;
CPUTLBEntry *entry;
target_ulong tlb_addr;
void *haddr;
tcg_debug_assert(mmu_idx < NB_MMU_MODES);
/* Handle CPU specific unaligned behaviour */
if (addr & ((1 << a_bits) - 1)) {
cpu_unaligned_access(env_cpu(env), addr, MMU_DATA_STORE,
mmu_idx, retaddr);
}
index = tlb_index(env, mmu_idx, addr);
entry = tlb_entry(env, mmu_idx, addr);
tlb_addr = tlb_addr_write(entry);
/* If the TLB entry is for a different page, reload and try again. */
if (!tlb_hit(tlb_addr, addr)) {
if (!victim_tlb_hit(env, mmu_idx, index, tlb_off,
addr & TARGET_PAGE_MASK)) {
tlb_fill(env_cpu(env), addr, size, MMU_DATA_STORE,
mmu_idx, retaddr);
index = tlb_index(env, mmu_idx, addr);
entry = tlb_entry(env, mmu_idx, addr);
}
tlb_addr = tlb_addr_write(entry) & ~TLB_INVALID_MASK;
}
/* Handle anything that isn't just a straight memory access. */
if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
CPUIOTLBEntry *iotlbentry;
bool need_swap;
/* For anything that is unaligned, recurse through byte stores. */
if ((addr & (size - 1)) != 0) {
goto do_unaligned_access;
}
iotlbentry = &env_tlb(env)->d[mmu_idx].iotlb[index];
/* Handle watchpoints. */
if (unlikely(tlb_addr & TLB_WATCHPOINT)) {
/* On watchpoint hit, this will longjmp out. */
cpu_check_watchpoint(env_cpu(env), addr, size,
iotlbentry->attrs, BP_MEM_WRITE, retaddr);
}
need_swap = size > 1 && (tlb_addr & TLB_BSWAP);
/* Handle I/O access. */
if (tlb_addr & TLB_MMIO) {
io_writex(env, iotlbentry, mmu_idx, val, addr, retaddr,
op ^ (need_swap * MO_BSWAP));
return;
}
/* Ignore writes to ROM. */
if (unlikely(tlb_addr & TLB_DISCARD_WRITE)) {
return;
}
/* Handle clean RAM pages. */
if (tlb_addr & TLB_NOTDIRTY) {
notdirty_write(env_cpu(env), addr, size, iotlbentry, retaddr);
}
haddr = (void *)((uintptr_t)addr + entry->addend);
/*
* Keep these two store_memop separate to ensure that the compiler
* is able to fold the entire function to a single instruction.
* There is a build-time assert inside to remind you of this. ;-)
*/
if (unlikely(need_swap)) {
store_memop(haddr, val, op ^ MO_BSWAP);
} else {
store_memop(haddr, val, op);
}
return;
}
/* Handle slow unaligned access (it spans two pages or IO). */
if (size > 1
&& unlikely((addr & ~TARGET_PAGE_MASK) + size - 1
>= TARGET_PAGE_SIZE)) {
do_unaligned_access:
store_helper_unaligned(env, addr, val, retaddr, size,
mmu_idx, memop_big_endian(op));
return;
}
haddr = (void *)((uintptr_t)addr + entry->addend);
store_memop(haddr, val, op);
}
static void __attribute__((noinline))
full_stb_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_UB);
store_helper(env, addr, val, oi, retaddr, MO_UB);
}
void helper_ret_stb_mmu(CPUArchState *env, target_ulong addr, uint8_t val,
MemOpIdx oi, uintptr_t retaddr)
{
full_stb_mmu(env, addr, val, oi, retaddr);
}
static void full_le_stw_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_LEUW);
store_helper(env, addr, val, oi, retaddr, MO_LEUW);
}
void helper_le_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
MemOpIdx oi, uintptr_t retaddr)
{
full_le_stw_mmu(env, addr, val, oi, retaddr);
}
static void full_be_stw_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_BEUW);
store_helper(env, addr, val, oi, retaddr, MO_BEUW);
}
void helper_be_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
MemOpIdx oi, uintptr_t retaddr)
{
full_be_stw_mmu(env, addr, val, oi, retaddr);
}
static void full_le_stl_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_LEUL);
store_helper(env, addr, val, oi, retaddr, MO_LEUL);
}
void helper_le_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
MemOpIdx oi, uintptr_t retaddr)
{
full_le_stl_mmu(env, addr, val, oi, retaddr);
}
static void full_be_stl_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_BEUL);
store_helper(env, addr, val, oi, retaddr, MO_BEUL);
}
void helper_be_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
MemOpIdx oi, uintptr_t retaddr)
{
full_be_stl_mmu(env, addr, val, oi, retaddr);
}
void helper_le_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_LEUQ);
store_helper(env, addr, val, oi, retaddr, MO_LEUQ);
}
void helper_be_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr)
{
validate_memop(oi, MO_BEUQ);
store_helper(env, addr, val, oi, retaddr, MO_BEUQ);
}
/*
* Store Helpers for cpu_ldst.h
*/
typedef void FullStoreHelper(CPUArchState *env, target_ulong addr,
uint64_t val, MemOpIdx oi, uintptr_t retaddr);
static inline void cpu_store_helper(CPUArchState *env, target_ulong addr,
uint64_t val, MemOpIdx oi, uintptr_t ra,
FullStoreHelper *full_store)
{
full_store(env, addr, val, oi, ra);
qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W);
}
void cpu_stb_mmu(CPUArchState *env, target_ulong addr, uint8_t val,
MemOpIdx oi, uintptr_t retaddr)
{
cpu_store_helper(env, addr, val, oi, retaddr, full_stb_mmu);
}
void cpu_stw_be_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
MemOpIdx oi, uintptr_t retaddr)
{
cpu_store_helper(env, addr, val, oi, retaddr, full_be_stw_mmu);
}
void cpu_stl_be_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
MemOpIdx oi, uintptr_t retaddr)
{
cpu_store_helper(env, addr, val, oi, retaddr, full_be_stl_mmu);
}
void cpu_stq_be_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr)
{
cpu_store_helper(env, addr, val, oi, retaddr, helper_be_stq_mmu);
}
void cpu_stw_le_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
MemOpIdx oi, uintptr_t retaddr)
{
cpu_store_helper(env, addr, val, oi, retaddr, full_le_stw_mmu);
}
void cpu_stl_le_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
MemOpIdx oi, uintptr_t retaddr)
{
cpu_store_helper(env, addr, val, oi, retaddr, full_le_stl_mmu);
}
void cpu_stq_le_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
MemOpIdx oi, uintptr_t retaddr)
{
cpu_store_helper(env, addr, val, oi, retaddr, helper_le_stq_mmu);
}
#include "ldst_common.c.inc"
/*
* First set of functions passes in OI and RETADDR.
* This makes them callable from other helpers.
*/
#define ATOMIC_NAME(X) \
glue(glue(glue(cpu_atomic_ ## X, SUFFIX), END), _mmu)
#define ATOMIC_MMU_CLEANUP
#include "atomic_common.c.inc"
#define DATA_SIZE 1
#include "atomic_template.h"
#define DATA_SIZE 2
#include "atomic_template.h"
#define DATA_SIZE 4
#include "atomic_template.h"
#ifdef CONFIG_ATOMIC64
#define DATA_SIZE 8
#include "atomic_template.h"
#endif
#if HAVE_CMPXCHG128 || HAVE_ATOMIC128
#define DATA_SIZE 16
#include "atomic_template.h"
#endif
/* Code access functions. */
static uint64_t full_ldub_code(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_8, true, full_ldub_code);
}
uint32_t cpu_ldub_code(CPUArchState *env, abi_ptr addr)
{
MemOpIdx oi = make_memop_idx(MO_UB, cpu_mmu_index(env, true));
return full_ldub_code(env, addr, oi, 0);
}
static uint64_t full_lduw_code(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_TEUW, true, full_lduw_code);
}
uint32_t cpu_lduw_code(CPUArchState *env, abi_ptr addr)
{
MemOpIdx oi = make_memop_idx(MO_TEUW, cpu_mmu_index(env, true));
return full_lduw_code(env, addr, oi, 0);
}
static uint64_t full_ldl_code(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_TEUL, true, full_ldl_code);
}
uint32_t cpu_ldl_code(CPUArchState *env, abi_ptr addr)
{
MemOpIdx oi = make_memop_idx(MO_TEUL, cpu_mmu_index(env, true));
return full_ldl_code(env, addr, oi, 0);
}
static uint64_t full_ldq_code(CPUArchState *env, target_ulong addr,
MemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_TEUQ, true, full_ldq_code);
}
uint64_t cpu_ldq_code(CPUArchState *env, abi_ptr addr)
{
MemOpIdx oi = make_memop_idx(MO_TEUQ, cpu_mmu_index(env, true));
return full_ldq_code(env, addr, oi, 0);
}
Reference in a new issue Copy permalink