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translate-all.c
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/*
* Host code generation
*
* 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 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/>.
*/
#ifdef _WIN32
#include <windows.h>
#endif
#include "qemu/osdep.h"
#include "qemu-common.h"
#define NO_CPU_IO_DEFS
#include "cpu.h"
#include "trace.h"
#include "disas/disas.h"
#include "exec/exec-all.h"
#include "tcg.h"
#if defined(CONFIG_USER_ONLY)
#include "qemu.h"
#include "exec/exec-all.h"
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <sys/param.h>
#if __FreeBSD_version >= 700104
#define HAVE_KINFO_GETVMMAP
#define sigqueue sigqueue_freebsd /* avoid redefinition */
#include <sys/proc.h>
#include <machine/profile.h>
#define _KERNEL
#include <sys/user.h>
#undef _KERNEL
#undef sigqueue
#include <libutil.h>
#endif
#endif
#else
#include "exec/address-spaces.h"
#endif
#include "exec/cputlb.h"
#include "exec/tb-hash.h"
#include "translate-all.h"
#include "qemu/bitmap.h"
#include "qemu/timer.h"
#include "exec/log.h"
/* #define DEBUG_TB_INVALIDATE */
/* #define DEBUG_TB_FLUSH */
/* #define DEBUG_LOCKING */
/* make various TB consistency checks */
/* #define DEBUG_TB_CHECK */
#if !defined(CONFIG_USER_ONLY)
/* TB consistency checks only implemented for usermode emulation. */
#undef DEBUG_TB_CHECK
#endif
/* Access to the various translations structures need to be serialised via locks
* for consistency. This is automatic for SoftMMU based system
* emulation due to its single threaded nature. In user-mode emulation
* access to the memory related structures are protected with the
* mmap_lock.
*/
#ifdef DEBUG_LOCKING
#define DEBUG_MEM_LOCKS 1
#else
#define DEBUG_MEM_LOCKS 0
#endif
#ifdef CONFIG_SOFTMMU
#define assert_memory_lock() do { /* nothing */ } while (0)
#else
#define assert_memory_lock() do { \
if (DEBUG_MEM_LOCKS) { \
g_assert(have_mmap_lock()); \
} \
} while (0)
#endif
#define SMC_BITMAP_USE_THRESHOLD 10
typedef struct PageDesc {
/* list of TBs intersecting this ram page */
TranslationBlock *first_tb;
#ifdef CONFIG_SOFTMMU
/* in order to optimize self modifying code, we count the number
of lookups we do to a given page to use a bitmap */
unsigned int code_write_count;
unsigned long *code_bitmap;
#else
unsigned long flags;
#endif
} PageDesc;
/* In system mode we want L1_MAP to be based on ram offsets,
while in user mode we want it to be based on virtual addresses. */
#if !defined(CONFIG_USER_ONLY)
#if HOST_LONG_BITS < TARGET_PHYS_ADDR_SPACE_BITS
# define L1_MAP_ADDR_SPACE_BITS HOST_LONG_BITS
#else
# define L1_MAP_ADDR_SPACE_BITS TARGET_PHYS_ADDR_SPACE_BITS
#endif
#else
# define L1_MAP_ADDR_SPACE_BITS TARGET_VIRT_ADDR_SPACE_BITS
#endif
/* Size of the L2 (and L3, etc) page tables. */
#define V_L2_BITS 10
#define V_L2_SIZE (1 << V_L2_BITS)
uintptr_t qemu_host_page_size;
intptr_t qemu_host_page_mask;
/*
* L1 Mapping properties
*/
static int v_l1_size;
static int v_l1_shift;
static int v_l2_levels;
/* The bottom level has pointers to PageDesc, and is indexed by
* anything from 4 to (V_L2_BITS + 3) bits, depending on target page size.
*/
#define V_L1_MIN_BITS 4
#define V_L1_MAX_BITS (V_L2_BITS + 3)
#define V_L1_MAX_SIZE (1 << V_L1_MAX_BITS)
static void *l1_map[V_L1_MAX_SIZE];
/* code generation context */
TCGContext tcg_ctx;
bool parallel_cpus;
/* translation block context */
#ifdef CONFIG_USER_ONLY
__thread int have_tb_lock;
#endif
static void page_table_config_init(void)
{
uint32_t v_l1_bits;
assert(TARGET_PAGE_BITS);
/* The bits remaining after N lower levels of page tables. */
v_l1_bits = (L1_MAP_ADDR_SPACE_BITS - TARGET_PAGE_BITS) % V_L2_BITS;
if (v_l1_bits < V_L1_MIN_BITS) {
v_l1_bits += V_L2_BITS;
}
v_l1_size = 1 << v_l1_bits;
v_l1_shift = L1_MAP_ADDR_SPACE_BITS - TARGET_PAGE_BITS - v_l1_bits;
v_l2_levels = v_l1_shift / V_L2_BITS - 1;
assert(v_l1_bits <= V_L1_MAX_BITS);
assert(v_l1_shift % V_L2_BITS == 0);
assert(v_l2_levels >= 0);
}
void tb_lock(void)
{
#ifdef CONFIG_USER_ONLY
assert(!have_tb_lock);
qemu_mutex_lock(&tcg_ctx.tb_ctx.tb_lock);
have_tb_lock++;
#endif
}
void tb_unlock(void)
{
#ifdef CONFIG_USER_ONLY
assert(have_tb_lock);
have_tb_lock--;
qemu_mutex_unlock(&tcg_ctx.tb_ctx.tb_lock);
#endif
}
void tb_lock_reset(void)
{
#ifdef CONFIG_USER_ONLY
if (have_tb_lock) {
qemu_mutex_unlock(&tcg_ctx.tb_ctx.tb_lock);
have_tb_lock = 0;
}
#endif
}
#ifdef DEBUG_LOCKING
#define DEBUG_TB_LOCKS 1
#else
#define DEBUG_TB_LOCKS 0
#endif
#ifdef CONFIG_SOFTMMU
#define assert_tb_lock() do { /* nothing */ } while (0)
#else
#define assert_tb_lock() do { \
if (DEBUG_TB_LOCKS) { \
g_assert(have_tb_lock); \
} \
} while (0)
#endif
static TranslationBlock *tb_find_pc(uintptr_t tc_ptr);
void cpu_gen_init(void)
{
tcg_context_init(&tcg_ctx);
}
/* Encode VAL as a signed leb128 sequence at P.
Return P incremented past the encoded value. */
static uint8_t *encode_sleb128(uint8_t *p, target_long val)
{
int more, byte;
do {
byte = val & 0x7f;
val >>= 7;
more = !((val == 0 && (byte & 0x40) == 0)
|| (val == -1 && (byte & 0x40) != 0));
if (more) {
byte |= 0x80;
}
*p++ = byte;
} while (more);
return p;
}
/* Decode a signed leb128 sequence at *PP; increment *PP past the
decoded value. Return the decoded value. */
static target_long decode_sleb128(uint8_t **pp)
{
uint8_t *p = *pp;
target_long val = 0;
int byte, shift = 0;
do {
byte = *p++;
val |= (target_ulong)(byte & 0x7f) << shift;
shift += 7;
} while (byte & 0x80);
if (shift < TARGET_LONG_BITS && (byte & 0x40)) {
val |= -(target_ulong)1 << shift;
}
*pp = p;
return val;
}
/* Encode the data collected about the instructions while compiling TB.
Place the data at BLOCK, and return the number of bytes consumed.
The logical table consisits of TARGET_INSN_START_WORDS target_ulong's,
which come from the target's insn_start data, followed by a uintptr_t
which comes from the host pc of the end of the code implementing the insn.
Each line of the table is encoded as sleb128 deltas from the previous
line. The seed for the first line is { tb->pc, 0..., tb->tc_ptr }.
That is, the first column is seeded with the guest pc, the last column
with the host pc, and the middle columns with zeros. */
static int encode_search(TranslationBlock *tb, uint8_t *block)
{
uint8_t *highwater = tcg_ctx.code_gen_highwater;
uint8_t *p = block;
int i, j, n;
tb->tc_search = block;
for (i = 0, n = tb->icount; i < n; ++i) {
target_ulong prev;
for (j = 0; j < TARGET_INSN_START_WORDS; ++j) {
if (i == 0) {
prev = (j == 0 ? tb->pc : 0);
} else {
prev = tcg_ctx.gen_insn_data[i - 1][j];
}
p = encode_sleb128(p, tcg_ctx.gen_insn_data[i][j] - prev);
}
prev = (i == 0 ? 0 : tcg_ctx.gen_insn_end_off[i - 1]);
p = encode_sleb128(p, tcg_ctx.gen_insn_end_off[i] - prev);
/* Test for (pending) buffer overflow. The assumption is that any
one row beginning below the high water mark cannot overrun
the buffer completely. Thus we can test for overflow after
encoding a row without having to check during encoding. */
if (unlikely(p > highwater)) {
return -1;
}
}
return p - block;
}
/* The cpu state corresponding to 'searched_pc' is restored.
* Called with tb_lock held.
*/
static int cpu_restore_state_from_tb(CPUState *cpu, TranslationBlock *tb,
uintptr_t searched_pc)
{
target_ulong data[TARGET_INSN_START_WORDS] = { tb->pc };
uintptr_t host_pc = (uintptr_t)tb->tc_ptr;
CPUArchState *env = cpu->env_ptr;
uint8_t *p = tb->tc_search;
int i, j, num_insns = tb->icount;
#ifdef CONFIG_PROFILER
int64_t ti = profile_getclock();
#endif
searched_pc -= GETPC_ADJ;
if (searched_pc < host_pc) {
return -1;
}
/* Reconstruct the stored insn data while looking for the point at
which the end of the insn exceeds the searched_pc. */
for (i = 0; i < num_insns; ++i) {
for (j = 0; j < TARGET_INSN_START_WORDS; ++j) {
data[j] += decode_sleb128(&p);
}
host_pc += decode_sleb128(&p);
if (host_pc > searched_pc) {
goto found;
}
}
return -1;
found:
if (tb->cflags & CF_USE_ICOUNT) {
assert(use_icount);
/* Reset the cycle counter to the start of the block. */
cpu->icount_decr.u16.low += num_insns;
/* Clear the IO flag. */
cpu->can_do_io = 0;
}
cpu->icount_decr.u16.low -= i;
restore_state_to_opc(env, tb, data);
#ifdef CONFIG_PROFILER
tcg_ctx.restore_time += profile_getclock() - ti;
tcg_ctx.restore_count++;
#endif
return 0;
}
bool cpu_restore_state(CPUState *cpu, uintptr_t retaddr)
{
TranslationBlock *tb;
bool r = false;
tb_lock();
tb = tb_find_pc(retaddr);
if (tb) {
cpu_restore_state_from_tb(cpu, tb, retaddr);
if (tb->cflags & CF_NOCACHE) {
/* one-shot translation, invalidate it immediately */
tb_phys_invalidate(tb, -1);
tb_free(tb);
}
r = true;
}
tb_unlock();
return r;
}
void page_size_init(void)
{
/* NOTE: we can always suppose that qemu_host_page_size >=
TARGET_PAGE_SIZE */
qemu_real_host_page_size = getpagesize();
qemu_real_host_page_mask = -(intptr_t)qemu_real_host_page_size;
if (qemu_host_page_size == 0) {
qemu_host_page_size = qemu_real_host_page_size;
}
if (qemu_host_page_size < TARGET_PAGE_SIZE) {
qemu_host_page_size = TARGET_PAGE_SIZE;
}
qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
}
static void page_init(void)
{
page_size_init();
page_table_config_init();
#if defined(CONFIG_BSD) && defined(CONFIG_USER_ONLY)
{
#ifdef HAVE_KINFO_GETVMMAP
struct kinfo_vmentry *freep;
int i, cnt;
freep = kinfo_getvmmap(getpid(), &cnt);
if (freep) {
mmap_lock();
for (i = 0; i < cnt; i++) {
unsigned long startaddr, endaddr;
startaddr = freep[i].kve_start;
endaddr = freep[i].kve_end;
if (h2g_valid(startaddr)) {
startaddr = h2g(startaddr) & TARGET_PAGE_MASK;
if (h2g_valid(endaddr)) {
endaddr = h2g(endaddr);
page_set_flags(startaddr, endaddr, PAGE_RESERVED);
} else {
#if TARGET_ABI_BITS <= L1_MAP_ADDR_SPACE_BITS
endaddr = ~0ul;
page_set_flags(startaddr, endaddr, PAGE_RESERVED);
#endif
}
}
}
free(freep);
mmap_unlock();
}
#else
FILE *f;
last_brk = (unsigned long)sbrk(0);
f = fopen("/compat/linux/proc/self/maps", "r");
if (f) {
mmap_lock();
do {
unsigned long startaddr, endaddr;
int n;
n = fscanf(f, "%lx-%lx %*[^\n]\n", &startaddr, &endaddr);
if (n == 2 && h2g_valid(startaddr)) {
startaddr = h2g(startaddr) & TARGET_PAGE_MASK;
if (h2g_valid(endaddr)) {
endaddr = h2g(endaddr);
} else {
endaddr = ~0ul;
}
page_set_flags(startaddr, endaddr, PAGE_RESERVED);
}
} while (!feof(f));
fclose(f);
mmap_unlock();
}
#endif
}
#endif
}
/* If alloc=1:
* Called with tb_lock held for system emulation.
* Called with mmap_lock held for user-mode emulation.
*/
static PageDesc *page_find_alloc(tb_page_addr_t index, int alloc)
{
PageDesc *pd;
void **lp;
int i;
if (alloc) {
assert_memory_lock();
}
/* Level 1. Always allocated. */
lp = l1_map + ((index >> v_l1_shift) & (v_l1_size - 1));
/* Level 2..N-1. */
for (i = v_l2_levels; i > 0; i--) {
void **p = atomic_rcu_read(lp);
if (p == NULL) {
if (!alloc) {
return NULL;
}
p = g_new0(void *, V_L2_SIZE);
atomic_rcu_set(lp, p);
}
lp = p + ((index >> (i * V_L2_BITS)) & (V_L2_SIZE - 1));
}
pd = atomic_rcu_read(lp);
if (pd == NULL) {
if (!alloc) {
return NULL;
}
pd = g_new0(PageDesc, V_L2_SIZE);
atomic_rcu_set(lp, pd);
}
return pd + (index & (V_L2_SIZE - 1));
}
static inline PageDesc *page_find(tb_page_addr_t index)
{
return page_find_alloc(index, 0);
}
#if defined(CONFIG_USER_ONLY)
/* Currently it is not recommended to allocate big chunks of data in
user mode. It will change when a dedicated libc will be used. */
/* ??? 64-bit hosts ought to have no problem mmaping data outside the
region in which the guest needs to run. Revisit this. */
#define USE_STATIC_CODE_GEN_BUFFER
#endif
/* Minimum size of the code gen buffer. This number is randomly chosen,
but not so small that we can't have a fair number of TB's live. */
#define MIN_CODE_GEN_BUFFER_SIZE (1024u * 1024)
/* Maximum size of the code gen buffer we'd like to use. Unless otherwise
indicated, this is constrained by the range of direct branches on the
host cpu, as used by the TCG implementation of goto_tb. */
#if defined(__x86_64__)
# define MAX_CODE_GEN_BUFFER_SIZE (2ul * 1024 * 1024 * 1024)
#elif defined(__sparc__)
# define MAX_CODE_GEN_BUFFER_SIZE (2ul * 1024 * 1024 * 1024)
#elif defined(__powerpc64__)
# define MAX_CODE_GEN_BUFFER_SIZE (2ul * 1024 * 1024 * 1024)
#elif defined(__powerpc__)
# define MAX_CODE_GEN_BUFFER_SIZE (32u * 1024 * 1024)
#elif defined(__aarch64__)
# define MAX_CODE_GEN_BUFFER_SIZE (128ul * 1024 * 1024)
#elif defined(__arm__)
# define MAX_CODE_GEN_BUFFER_SIZE (16u * 1024 * 1024)
#elif defined(__s390x__)
/* We have a +- 4GB range on the branches; leave some slop. */
# define MAX_CODE_GEN_BUFFER_SIZE (3ul * 1024 * 1024 * 1024)
#elif defined(__mips__)
/* We have a 256MB branch region, but leave room to make sure the
main executable is also within that region. */
# define MAX_CODE_GEN_BUFFER_SIZE (128ul * 1024 * 1024)
#else
# define MAX_CODE_GEN_BUFFER_SIZE ((size_t)-1)
#endif
#define DEFAULT_CODE_GEN_BUFFER_SIZE_1 (32u * 1024 * 1024)
#define DEFAULT_CODE_GEN_BUFFER_SIZE \
(DEFAULT_CODE_GEN_BUFFER_SIZE_1 < MAX_CODE_GEN_BUFFER_SIZE \
? DEFAULT_CODE_GEN_BUFFER_SIZE_1 : MAX_CODE_GEN_BUFFER_SIZE)
static inline size_t size_code_gen_buffer(size_t tb_size)
{
/* Size the buffer. */
if (tb_size == 0) {
#ifdef USE_STATIC_CODE_GEN_BUFFER
tb_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
#else
/* ??? Needs adjustments. */
/* ??? If we relax the requirement that CONFIG_USER_ONLY use the
static buffer, we could size this on RESERVED_VA, on the text
segment size of the executable, or continue to use the default. */
tb_size = (unsigned long)(ram_size / 4);
#endif
}
if (tb_size < MIN_CODE_GEN_BUFFER_SIZE) {
tb_size = MIN_CODE_GEN_BUFFER_SIZE;
}
if (tb_size > MAX_CODE_GEN_BUFFER_SIZE) {
tb_size = MAX_CODE_GEN_BUFFER_SIZE;
}
return tb_size;
}
#ifdef __mips__
/* In order to use J and JAL within the code_gen_buffer, we require
that the buffer not cross a 256MB boundary. */
static inline bool cross_256mb(void *addr, size_t size)
{
return ((uintptr_t)addr ^ ((uintptr_t)addr + size)) & ~0x0ffffffful;
}
/* We weren't able to allocate a buffer without crossing that boundary,
so make do with the larger portion of the buffer that doesn't cross.
Returns the new base of the buffer, and adjusts code_gen_buffer_size. */
static inline void *split_cross_256mb(void *buf1, size_t size1)
{
void *buf2 = (void *)(((uintptr_t)buf1 + size1) & ~0x0ffffffful);
size_t size2 = buf1 + size1 - buf2;
size1 = buf2 - buf1;
if (size1 < size2) {
size1 = size2;
buf1 = buf2;
}
tcg_ctx.code_gen_buffer_size = size1;
return buf1;
}
#endif
#ifdef USE_STATIC_CODE_GEN_BUFFER
static uint8_t static_code_gen_buffer[DEFAULT_CODE_GEN_BUFFER_SIZE]
__attribute__((aligned(CODE_GEN_ALIGN)));
# ifdef _WIN32
static inline void do_protect(void *addr, long size, int prot)
{
DWORD old_protect;
VirtualProtect(addr, size, prot, &old_protect);
}
static inline void map_exec(void *addr, long size)
{
do_protect(addr, size, PAGE_EXECUTE_READWRITE);
}
static inline void map_none(void *addr, long size)
{
do_protect(addr, size, PAGE_NOACCESS);
}
# else
static inline void do_protect(void *addr, long size, int prot)
{
uintptr_t start, end;
start = (uintptr_t)addr;
start &= qemu_real_host_page_mask;
end = (uintptr_t)addr + size;
end = ROUND_UP(end, qemu_real_host_page_size);
mprotect((void *)start, end - start, prot);
}
static inline void map_exec(void *addr, long size)
{
do_protect(addr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
}
static inline void map_none(void *addr, long size)
{
do_protect(addr, size, PROT_NONE);
}
# endif /* WIN32 */
static inline void *alloc_code_gen_buffer(void)
{
void *buf = static_code_gen_buffer;
size_t full_size, size;
/* The size of the buffer, rounded down to end on a page boundary. */
full_size = (((uintptr_t)buf + sizeof(static_code_gen_buffer))
& qemu_real_host_page_mask) - (uintptr_t)buf;
/* Reserve a guard page. */
size = full_size - qemu_real_host_page_size;
/* Honor a command-line option limiting the size of the buffer. */
if (size > tcg_ctx.code_gen_buffer_size) {
size = (((uintptr_t)buf + tcg_ctx.code_gen_buffer_size)
& qemu_real_host_page_mask) - (uintptr_t)buf;
}
tcg_ctx.code_gen_buffer_size = size;
#ifdef __mips__
if (cross_256mb(buf, size)) {
buf = split_cross_256mb(buf, size);
size = tcg_ctx.code_gen_buffer_size;
}
#endif
map_exec(buf, size);
map_none(buf + size, qemu_real_host_page_size);
qemu_madvise(buf, size, QEMU_MADV_HUGEPAGE);
return buf;
}
#elif defined(_WIN32)
static inline void *alloc_code_gen_buffer(void)
{
size_t size = tcg_ctx.code_gen_buffer_size;
void *buf1, *buf2;
/* Perform the allocation in two steps, so that the guard page
is reserved but uncommitted. */
buf1 = VirtualAlloc(NULL, size + qemu_real_host_page_size,
MEM_RESERVE, PAGE_NOACCESS);
if (buf1 != NULL) {
buf2 = VirtualAlloc(buf1, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
assert(buf1 == buf2);
}
return buf1;
}
#else
static inline void *alloc_code_gen_buffer(void)
{
int flags = MAP_PRIVATE | MAP_ANONYMOUS;
uintptr_t start = 0;
size_t size = tcg_ctx.code_gen_buffer_size;
void *buf;
/* Constrain the position of the buffer based on the host cpu.
Note that these addresses are chosen in concert with the
addresses assigned in the relevant linker script file. */
# if defined(__PIE__) || defined(__PIC__)
/* Don't bother setting a preferred location if we're building
a position-independent executable. We're more likely to get
an address near the main executable if we let the kernel
choose the address. */
# elif defined(__x86_64__) && defined(MAP_32BIT)
/* Force the memory down into low memory with the executable.
Leave the choice of exact location with the kernel. */
flags |= MAP_32BIT;
/* Cannot expect to map more than 800MB in low memory. */
if (size > 800u * 1024 * 1024) {
tcg_ctx.code_gen_buffer_size = size = 800u * 1024 * 1024;
}
# elif defined(__sparc__)
start = 0x40000000ul;
# elif defined(__s390x__)
start = 0x90000000ul;
# elif defined(__mips__)
# if _MIPS_SIM == _ABI64
start = 0x128000000ul;
# else
start = 0x08000000ul;
# endif
# endif
buf = mmap((void *)start, size + qemu_real_host_page_size,
PROT_NONE, flags, -1, 0);
if (buf == MAP_FAILED) {
return NULL;
}
#ifdef __mips__
if (cross_256mb(buf, size)) {
/* Try again, with the original still mapped, to avoid re-acquiring
that 256mb crossing. This time don't specify an address. */
size_t size2;
void *buf2 = mmap(NULL, size + qemu_real_host_page_size,
PROT_NONE, flags, -1, 0);
switch (buf2 != MAP_FAILED) {
case 1:
if (!cross_256mb(buf2, size)) {
/* Success! Use the new buffer. */
munmap(buf, size + qemu_real_host_page_size);
break;
}
/* Failure. Work with what we had. */
munmap(buf2, size + qemu_real_host_page_size);
/* fallthru */
default:
/* Split the original buffer. Free the smaller half. */
buf2 = split_cross_256mb(buf, size);
size2 = tcg_ctx.code_gen_buffer_size;
if (buf == buf2) {
munmap(buf + size2 + qemu_real_host_page_size, size - size2);
} else {
munmap(buf, size - size2);
}
size = size2;
break;
}
buf = buf2;
}
#endif
/* Make the final buffer accessible. The guard page at the end
will remain inaccessible with PROT_NONE. */
mprotect(buf, size, PROT_WRITE | PROT_READ | PROT_EXEC);
/* Request large pages for the buffer. */
qemu_madvise(buf, size, QEMU_MADV_HUGEPAGE);
return buf;
}
#endif /* USE_STATIC_CODE_GEN_BUFFER, WIN32, POSIX */
static inline void code_gen_alloc(size_t tb_size)
{
tcg_ctx.code_gen_buffer_size = size_code_gen_buffer(tb_size);
tcg_ctx.code_gen_buffer = alloc_code_gen_buffer();
if (tcg_ctx.code_gen_buffer == NULL) {
fprintf(stderr, "Could not allocate dynamic translator buffer\n");
exit(1);
}
/* Estimate a good size for the number of TBs we can support. We
still haven't deducted the prologue from the buffer size here,
but that's minimal and won't affect the estimate much. */
tcg_ctx.code_gen_max_blocks
= tcg_ctx.code_gen_buffer_size / CODE_GEN_AVG_BLOCK_SIZE;
tcg_ctx.tb_ctx.tbs = g_new(TranslationBlock, tcg_ctx.code_gen_max_blocks);
qemu_mutex_init(&tcg_ctx.tb_ctx.tb_lock);
}
static void tb_htable_init(void)
{
unsigned int mode = QHT_MODE_AUTO_RESIZE;
qht_init(&tcg_ctx.tb_ctx.htable, CODE_GEN_HTABLE_SIZE, mode);
}
/* Must be called before using the QEMU cpus. 'tb_size' is the size
(in bytes) allocated to the translation buffer. Zero means default
size. */
void tcg_exec_init(unsigned long tb_size)
{
cpu_gen_init();
page_init();
tb_htable_init();
code_gen_alloc(tb_size);
#if defined(CONFIG_SOFTMMU)
/* There's no guest base to take into account, so go ahead and
initialize the prologue now. */
tcg_prologue_init(&tcg_ctx);
#endif
}
bool tcg_enabled(void)
{
return tcg_ctx.code_gen_buffer != NULL;
}
/*
* Allocate a new translation block. Flush the translation buffer if
* too many translation blocks or too much generated code.
*
* Called with tb_lock held.
*/
static TranslationBlock *tb_alloc(target_ulong pc)
{
TranslationBlock *tb;
assert_tb_lock();
if (tcg_ctx.tb_ctx.nb_tbs >= tcg_ctx.code_gen_max_blocks) {
return NULL;
}
tb = &tcg_ctx.tb_ctx.tbs[tcg_ctx.tb_ctx.nb_tbs++];
tb->pc = pc;
tb->cflags = 0;
tb->invalid = false;
return tb;
}
/* Called with tb_lock held. */
void tb_free(TranslationBlock *tb)
{
assert_tb_lock();
/* In practice this is mostly used for single use temporary TB
Ignore the hard cases and just back up if this TB happens to
be the last one generated. */
if (tcg_ctx.tb_ctx.nb_tbs > 0 &&
tb == &tcg_ctx.tb_ctx.tbs[tcg_ctx.tb_ctx.nb_tbs - 1]) {
tcg_ctx.code_gen_ptr = tb->tc_ptr;
tcg_ctx.tb_ctx.nb_tbs--;
}
}
static inline void invalidate_page_bitmap(PageDesc *p)
{
#ifdef CONFIG_SOFTMMU
g_free(p->code_bitmap);
p->code_bitmap = NULL;
p->code_write_count = 0;
#endif
}
/* Set to NULL all the 'first_tb' fields in all PageDescs. */
static void page_flush_tb_1(int level, void **lp)
{
int i;
if (*lp == NULL) {
return;
}
if (level == 0) {
PageDesc *pd = *lp;
for (i = 0; i < V_L2_SIZE; ++i) {
pd[i].first_tb = NULL;
invalidate_page_bitmap(pd + i);
}
} else {
void **pp = *lp;
for (i = 0; i < V_L2_SIZE; ++i) {
page_flush_tb_1(level - 1, pp + i);
}
}
}
static void page_flush_tb(void)
{
int i, l1_sz = v_l1_size;
for (i = 0; i < l1_sz; i++) {
page_flush_tb_1(v_l2_levels, l1_map + i);
}
}
/* flush all the translation blocks */
static void do_tb_flush(CPUState *cpu, run_on_cpu_data tb_flush_count)
{
tb_lock();
/* If it is already been done on request of another CPU,
* just retry.
*/
if (tcg_ctx.tb_ctx.tb_flush_count != tb_flush_count.host_int) {
goto done;
}
#if defined(DEBUG_TB_FLUSH)
printf("qemu: flush code_size=%ld nb_tbs=%d avg_tb_size=%ld\n",
(unsigned long)(tcg_ctx.code_gen_ptr - tcg_ctx.code_gen_buffer),
tcg_ctx.tb_ctx.nb_tbs, tcg_ctx.tb_ctx.nb_tbs > 0 ?
((unsigned long)(tcg_ctx.code_gen_ptr - tcg_ctx.code_gen_buffer)) /
tcg_ctx.tb_ctx.nb_tbs : 0);
#endif
if ((unsigned long)(tcg_ctx.code_gen_ptr - tcg_ctx.code_gen_buffer)
> tcg_ctx.code_gen_buffer_size) {
cpu_abort(cpu, "Internal error: code buffer overflow\n");
}
CPU_FOREACH(cpu) {
int i;
for (i = 0; i < TB_JMP_CACHE_SIZE; ++i) {
atomic_set(&cpu->tb_jmp_cache[i], NULL);
}
}
tcg_ctx.tb_ctx.nb_tbs = 0;
qht_reset_size(&tcg_ctx.tb_ctx.htable, CODE_GEN_HTABLE_SIZE);
page_flush_tb();
tcg_ctx.code_gen_ptr = tcg_ctx.code_gen_buffer;
/* XXX: flush processor icache at this point if cache flush is
expensive */
atomic_mb_set(&tcg_ctx.tb_ctx.tb_flush_count,
tcg_ctx.tb_ctx.tb_flush_count + 1);
done:
tb_unlock();
}
void tb_flush(CPUState *cpu)
{
if (tcg_enabled()) {
unsigned tb_flush_count = atomic_mb_read(&tcg_ctx.tb_ctx.tb_flush_count);
async_safe_run_on_cpu(cpu, do_tb_flush,
RUN_ON_CPU_HOST_INT(tb_flush_count));
}
}
#ifdef DEBUG_TB_CHECK
static void
do_tb_invalidate_check(struct qht *ht, void *p, uint32_t hash, void *userp)
{
TranslationBlock *tb = p;
target_ulong addr = *(target_ulong *)userp;
if (!(addr + TARGET_PAGE_SIZE <= tb->pc || addr >= tb->pc + tb->size)) {
printf("ERROR invalidate: address=" TARGET_FMT_lx
" PC=%08lx size=%04x\n", addr, (long)tb->pc, tb->size);
}
}
/* verify that all the pages have correct rights for code
*
* Called with tb_lock held.
*/
static void tb_invalidate_check(target_ulong address)
{
address &= TARGET_PAGE_MASK;
qht_iter(&tcg_ctx.tb_ctx.htable, do_tb_invalidate_check, &address);
}
static void
do_tb_page_check(struct qht *ht, void *p, uint32_t hash, void *userp)
{