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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 2.1 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"
#define NO_CPU_IO_DEFS
#include "trace.h"
#include "disas/disas.h"
#include "exec/exec-all.h"
#include "tcg/tcg.h"
#if defined(CONFIG_USER_ONLY)
#include "qemu.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/ram_addr.h"
#endif
#include "exec/cputlb.h"
#include "exec/translate-all.h"
#include "exec/translator.h"
#include "qemu/bitmap.h"
#include "qemu/qemu-print.h"
#include "qemu/timer.h"
#include "qemu/main-loop.h"
#include "qemu/cacheinfo.h"
#include "exec/log.h"
#include "qemu/etrace.h"
#include "sysemu/cpus.h"
#include "sysemu/cpu-timers.h"
#include "sysemu/tcg.h"
#include "qapi/error.h"
#include "hw/core/tcg-cpu-ops.h"
#include "tb-jmp-cache.h"
#include "tb-hash.h"
#include "tb-context.h"
#include "internal.h"
/* make various TB consistency checks */
/**
* struct page_entry - page descriptor entry
* @pd: pointer to the &struct PageDesc of the page this entry represents
* @index: page index of the page
* @locked: whether the page is locked
*
* This struct helps us keep track of the locked state of a page, without
* bloating &struct PageDesc.
*
* A page lock protects accesses to all fields of &struct PageDesc.
*
* See also: &struct page_collection.
*/
struct page_entry {
PageDesc *pd;
tb_page_addr_t index;
bool locked;
};
/**
* struct page_collection - tracks a set of pages (i.e. &struct page_entry's)
* @tree: Binary search tree (BST) of the pages, with key == page index
* @max: Pointer to the page in @tree with the highest page index
*
* To avoid deadlock we lock pages in ascending order of page index.
* When operating on a set of pages, we need to keep track of them so that
* we can lock them in order and also unlock them later. For this we collect
* pages (i.e. &struct page_entry's) in a binary search @tree. Given that the
* @tree implementation we use does not provide an O(1) operation to obtain the
* highest-ranked element, we use @max to keep track of the inserted page
* with the highest index. This is valuable because if a page is not in
* the tree and its index is higher than @max's, then we can lock it
* without breaking the locking order rule.
*
* Note on naming: 'struct page_set' would be shorter, but we already have a few
* page_set_*() helpers, so page_collection is used instead to avoid confusion.
*
* See also: page_collection_lock().
*/
struct page_collection {
GTree *tree;
struct page_entry *max;
};
/*
* 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.
*
* TODO: For user mode, see the caveat re host vs guest virtual
* address spaces near GUEST_ADDR_MAX.
*/
#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 MIN(HOST_LONG_BITS, TARGET_ABI_BITS)
#endif
/* Make sure all possible CPU event bits fit in tb->trace_vcpu_dstate */
QEMU_BUILD_BUG_ON(CPU_TRACE_DSTATE_MAX_EVENTS >
sizeof_field(TranslationBlock, trace_vcpu_dstate)
* BITS_PER_BYTE);
/*
* L1 Mapping properties
*/
int v_l1_size;
int v_l1_shift;
int v_l2_levels;
void *l1_map[V_L1_MAX_SIZE];
TBContext tb_ctx;
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);
}
/* 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(const uint8_t **pp)
{
const 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 consists 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;
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 = (!TARGET_TB_PCREL && j == 0 ? tb_pc(tb) : 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.
* When reset_icount is true, current TB will be interrupted and
* icount should be recalculated.
*/
int cpu_restore_state_from_tb(CPUState *cpu, TranslationBlock *tb,
uintptr_t searched_pc, bool reset_icount)
{
uint64_t data[TARGET_INSN_START_WORDS];
uintptr_t host_pc = (uintptr_t)tb->tc.ptr;
const uint8_t *p = tb->tc.ptr + tb->tc.size;
int i, j, num_insns = tb->icount;
#ifdef CONFIG_PROFILER
TCGProfile *prof = &tcg_ctx->prof;
int64_t ti = profile_getclock();
#endif
searched_pc -= GETPC_ADJ;
if (searched_pc < host_pc) {
return -1;
}
memset(data, 0, sizeof(data));
if (!TARGET_TB_PCREL) {
data[0] = tb_pc(tb);
}
/* 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 (reset_icount && (tb_cflags(tb) & CF_USE_ICOUNT)) {
assert(icount_enabled());
/* Reset the cycle counter to the start of the block
and shift if to the number of actually executed instructions */
cpu_neg(cpu)->icount_decr.u16.low += num_insns - i;
}
cpu->cc->tcg_ops->restore_state_to_opc(cpu, tb, data);
#ifdef CONFIG_PROFILER
qatomic_set(&prof->restore_time,
prof->restore_time + profile_getclock() - ti);
qatomic_set(&prof->restore_count, prof->restore_count + 1);
#endif
return 0;
}
bool cpu_restore_state(CPUState *cpu, uintptr_t host_pc, bool will_exit)
{
/*
* The pc update associated with restore without exit will
* break the relative pc adjustments performed by TARGET_TB_PCREL.
*/
if (TARGET_TB_PCREL) {
assert(will_exit);
}
/*
* The host_pc has to be in the rx region of the code buffer.
* If it is not we will not be able to resolve it here.
* The two cases where host_pc will not be correct are:
*
* - fault during translation (instruction fetch)
* - fault from helper (not using GETPC() macro)
*
* Either way we need return early as we can't resolve it here.
*/
if (in_code_gen_buffer((const void *)(host_pc - tcg_splitwx_diff))) {
TranslationBlock *tb = tcg_tb_lookup(host_pc);
if (tb) {
cpu_restore_state_from_tb(cpu, tb, host_pc, will_exit);
return true;
}
}
return false;
}
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
}
PageDesc *page_find_alloc(tb_page_addr_t index, bool alloc)
{
PageDesc *pd;
void **lp;
int i;
/* 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 = qatomic_rcu_read(lp);
if (p == NULL) {
void *existing;
if (!alloc) {
return NULL;
}
p = g_new0(void *, V_L2_SIZE);
existing = qatomic_cmpxchg(lp, NULL, p);
if (unlikely(existing)) {
g_free(p);
p = existing;
}
}
lp = p + ((index >> (i * V_L2_BITS)) & (V_L2_SIZE - 1));
}
pd = qatomic_rcu_read(lp);
if (pd == NULL) {
void *existing;
if (!alloc) {
return NULL;
}
pd = g_new0(PageDesc, V_L2_SIZE);
#ifndef CONFIG_USER_ONLY
{
int i;
for (i = 0; i < V_L2_SIZE; i++) {
qemu_spin_init(&pd[i].lock);
}
}
#endif
existing = qatomic_cmpxchg(lp, NULL, pd);
if (unlikely(existing)) {
#ifndef CONFIG_USER_ONLY
{
int i;
for (i = 0; i < V_L2_SIZE; i++) {
qemu_spin_destroy(&pd[i].lock);
}
}
#endif
g_free(pd);
pd = existing;
}
}
return pd + (index & (V_L2_SIZE - 1));
}
/* In user-mode page locks aren't used; mmap_lock is enough */
#ifdef CONFIG_USER_ONLY
struct page_collection *
page_collection_lock(tb_page_addr_t start, tb_page_addr_t end)
{
return NULL;
}
void page_collection_unlock(struct page_collection *set)
{ }
#else /* !CONFIG_USER_ONLY */
#ifdef CONFIG_DEBUG_TCG
static __thread GHashTable *ht_pages_locked_debug;
static void ht_pages_locked_debug_init(void)
{
if (ht_pages_locked_debug) {
return;
}
ht_pages_locked_debug = g_hash_table_new(NULL, NULL);
}
static bool page_is_locked(const PageDesc *pd)
{
PageDesc *found;
ht_pages_locked_debug_init();
found = g_hash_table_lookup(ht_pages_locked_debug, pd);
return !!found;
}
static void page_lock__debug(PageDesc *pd)
{
ht_pages_locked_debug_init();
g_assert(!page_is_locked(pd));
g_hash_table_insert(ht_pages_locked_debug, pd, pd);
}
static void page_unlock__debug(const PageDesc *pd)
{
bool removed;
ht_pages_locked_debug_init();
g_assert(page_is_locked(pd));
removed = g_hash_table_remove(ht_pages_locked_debug, pd);
g_assert(removed);
}
void do_assert_page_locked(const PageDesc *pd, const char *file, int line)
{
if (unlikely(!page_is_locked(pd))) {
error_report("assert_page_lock: PageDesc %p not locked @ %s:%d",
pd, file, line);
abort();
}
}
void assert_no_pages_locked(void)
{
ht_pages_locked_debug_init();
g_assert(g_hash_table_size(ht_pages_locked_debug) == 0);
}
#else /* !CONFIG_DEBUG_TCG */
static inline void page_lock__debug(const PageDesc *pd) { }
static inline void page_unlock__debug(const PageDesc *pd) { }
#endif /* CONFIG_DEBUG_TCG */
void page_lock(PageDesc *pd)
{
page_lock__debug(pd);
qemu_spin_lock(&pd->lock);
}
void page_unlock(PageDesc *pd)
{
qemu_spin_unlock(&pd->lock);
page_unlock__debug(pd);
}
static inline struct page_entry *
page_entry_new(PageDesc *pd, tb_page_addr_t index)
{
struct page_entry *pe = g_malloc(sizeof(*pe));
pe->index = index;
pe->pd = pd;
pe->locked = false;
return pe;
}
static void page_entry_destroy(gpointer p)
{
struct page_entry *pe = p;
g_assert(pe->locked);
page_unlock(pe->pd);
g_free(pe);
}
/* returns false on success */
static bool page_entry_trylock(struct page_entry *pe)
{
bool busy;
busy = qemu_spin_trylock(&pe->pd->lock);
if (!busy) {
g_assert(!pe->locked);
pe->locked = true;
page_lock__debug(pe->pd);
}
return busy;
}
static void do_page_entry_lock(struct page_entry *pe)
{
page_lock(pe->pd);
g_assert(!pe->locked);
pe->locked = true;
}
static gboolean page_entry_lock(gpointer key, gpointer value, gpointer data)
{
struct page_entry *pe = value;
do_page_entry_lock(pe);
return FALSE;
}
static gboolean page_entry_unlock(gpointer key, gpointer value, gpointer data)
{
struct page_entry *pe = value;
if (pe->locked) {
pe->locked = false;
page_unlock(pe->pd);
}
return FALSE;
}
/*
* Trylock a page, and if successful, add the page to a collection.
* Returns true ("busy") if the page could not be locked; false otherwise.
*/
static bool page_trylock_add(struct page_collection *set, tb_page_addr_t addr)
{
tb_page_addr_t index = addr >> TARGET_PAGE_BITS;
struct page_entry *pe;
PageDesc *pd;
pe = g_tree_lookup(set->tree, &index);
if (pe) {
return false;
}
pd = page_find(index);
if (pd == NULL) {
return false;
}
pe = page_entry_new(pd, index);
g_tree_insert(set->tree, &pe->index, pe);
/*
* If this is either (1) the first insertion or (2) a page whose index
* is higher than any other so far, just lock the page and move on.
*/
if (set->max == NULL || pe->index > set->max->index) {
set->max = pe;
do_page_entry_lock(pe);
return false;
}
/*
* Try to acquire out-of-order lock; if busy, return busy so that we acquire
* locks in order.
*/
return page_entry_trylock(pe);
}
static gint tb_page_addr_cmp(gconstpointer ap, gconstpointer bp, gpointer udata)
{
tb_page_addr_t a = *(const tb_page_addr_t *)ap;
tb_page_addr_t b = *(const tb_page_addr_t *)bp;
if (a == b) {
return 0;
} else if (a < b) {
return -1;
}
return 1;
}
/*
* Lock a range of pages ([@start,@end[) as well as the pages of all
* intersecting TBs.
* Locking order: acquire locks in ascending order of page index.
*/
struct page_collection *
page_collection_lock(tb_page_addr_t start, tb_page_addr_t end)
{
struct page_collection *set = g_malloc(sizeof(*set));
tb_page_addr_t index;
PageDesc *pd;
start >>= TARGET_PAGE_BITS;
end >>= TARGET_PAGE_BITS;
g_assert(start <= end);
set->tree = g_tree_new_full(tb_page_addr_cmp, NULL, NULL,
page_entry_destroy);
set->max = NULL;
assert_no_pages_locked();
retry:
g_tree_foreach(set->tree, page_entry_lock, NULL);
for (index = start; index <= end; index++) {
TranslationBlock *tb;
int n;
pd = page_find(index);
if (pd == NULL) {
continue;
}
if (page_trylock_add(set, index << TARGET_PAGE_BITS)) {
g_tree_foreach(set->tree, page_entry_unlock, NULL);
goto retry;
}
assert_page_locked(pd);
PAGE_FOR_EACH_TB(pd, tb, n) {
if (page_trylock_add(set, tb_page_addr0(tb)) ||
(tb_page_addr1(tb) != -1 &&
page_trylock_add(set, tb_page_addr1(tb)))) {
/* drop all locks, and reacquire in order */
g_tree_foreach(set->tree, page_entry_unlock, NULL);
goto retry;
}
}
}
return set;
}
void page_collection_unlock(struct page_collection *set)
{
/* entries are unlocked and freed via page_entry_destroy */
g_tree_destroy(set->tree);
g_free(set);
}
#endif /* !CONFIG_USER_ONLY */
/* Called with mmap_lock held for user mode emulation. */
TranslationBlock *tb_gen_code(CPUState *cpu,
target_ulong pc, target_ulong cs_base,
uint32_t flags, int cflags)
{
CPUArchState *env = cpu->env_ptr;
TranslationBlock *tb, *existing_tb;
tb_page_addr_t phys_pc;
tcg_insn_unit *gen_code_buf;
int gen_code_size, search_size, max_insns;
#ifdef CONFIG_PROFILER
TCGProfile *prof = &tcg_ctx->prof;
int64_t ti;
#endif
void *host_pc;
assert_memory_lock();
qemu_thread_jit_write();
phys_pc = get_page_addr_code_hostp(env, pc, &host_pc);
if (phys_pc == -1) {
/* XILINX. Allow prefetching more than 1 inst from MMIO */
/* Generate a one-shot TB with 1 insn in it */
cflags = (cflags & ~CF_COUNT_MASK) | CF_LAST_IO;
}
max_insns = cflags & CF_COUNT_MASK;
if (max_insns == 0) {
max_insns = TCG_MAX_INSNS;
}
QEMU_BUILD_BUG_ON(CF_COUNT_MASK + 1 != TCG_MAX_INSNS);
buffer_overflow:
tb = tcg_tb_alloc(tcg_ctx);
if (unlikely(!tb)) {
/* flush must be done */
tb_flush(cpu);
mmap_unlock();
/* Make the execution loop process the flush as soon as possible. */
cpu->exception_index = EXCP_INTERRUPT;
cpu_loop_exit(cpu);
}
gen_code_buf = tcg_ctx->code_gen_ptr;
tb->tc.ptr = tcg_splitwx_to_rx(gen_code_buf);
#if !TARGET_TB_PCREL
tb->pc = pc;
#endif
tb->cs_base = cs_base;
tb->flags = flags;
tb->cflags = cflags;
tb->trace_vcpu_dstate = *cpu->trace_dstate;
tb_set_page_addr0(tb, phys_pc);
tb_set_page_addr1(tb, -1);
tcg_ctx->tb_cflags = cflags;
tb_overflow:
#ifdef CONFIG_PROFILER
/* includes aborted translations because of exceptions */
qatomic_set(&prof->tb_count1, prof->tb_count1 + 1);
ti = profile_getclock();
#endif
gen_code_size = sigsetjmp(tcg_ctx->jmp_trans, 0);
if (unlikely(gen_code_size != 0)) {
goto error_return;
}
tcg_func_start(tcg_ctx);
tcg_ctx->cpu = env_cpu(env);
gen_intermediate_code(cpu, tb, max_insns, pc, host_pc);
assert(tb->size != 0);
tcg_ctx->cpu = NULL;
max_insns = tb->icount;
trace_translate_block(tb, pc, tb->tc.ptr);
/* generate machine code */
tb->jmp_reset_offset[0] = TB_JMP_RESET_OFFSET_INVALID;
tb->jmp_reset_offset[1] = TB_JMP_RESET_OFFSET_INVALID;
tcg_ctx->tb_jmp_reset_offset = tb->jmp_reset_offset;
if (TCG_TARGET_HAS_direct_jump) {
tcg_ctx->tb_jmp_insn_offset = tb->jmp_target_arg;
tcg_ctx->tb_jmp_target_addr = NULL;
} else {
tcg_ctx->tb_jmp_insn_offset = NULL;
tcg_ctx->tb_jmp_target_addr = tb->jmp_target_arg;
}
#ifdef CONFIG_PROFILER
qatomic_set(&prof->tb_count, prof->tb_count + 1);
qatomic_set(&prof->interm_time,
prof->interm_time + profile_getclock() - ti);
ti = profile_getclock();
#endif
gen_code_size = tcg_gen_code(tcg_ctx, tb, pc);
if (unlikely(gen_code_size < 0)) {
error_return:
switch (gen_code_size) {
case -1:
/*
* Overflow of code_gen_buffer, or the current slice of it.
*
* TODO: We don't need to re-do gen_intermediate_code, nor
* should we re-do the tcg optimization currently hidden
* inside tcg_gen_code. All that should be required is to
* flush the TBs, allocate a new TB, re-initialize it per
* above, and re-do the actual code generation.
*/
qemu_log_mask(CPU_LOG_TB_OP | CPU_LOG_TB_OP_OPT,
"Restarting code generation for "
"code_gen_buffer overflow\n");
goto buffer_overflow;
case -2:
/*
* The code generated for the TranslationBlock is too large.
* The maximum size allowed by the unwind info is 64k.
* There may be stricter constraints from relocations
* in the tcg backend.
*
* Try again with half as many insns as we attempted this time.
* If a single insn overflows, there's a bug somewhere...
*/
assert(max_insns > 1);
max_insns /= 2;
qemu_log_mask(CPU_LOG_TB_OP | CPU_LOG_TB_OP_OPT,
"Restarting code generation with "
"smaller translation block (max %d insns)\n",
max_insns);
goto tb_overflow;
default:
g_assert_not_reached();
}
}
search_size = encode_search(tb, (void *)gen_code_buf + gen_code_size);
if (unlikely(search_size < 0)) {
goto buffer_overflow;
}
tb->tc.size = gen_code_size;
#ifdef CONFIG_PROFILER
qatomic_set(&prof->code_time, prof->code_time + profile_getclock() - ti);
qatomic_set(&prof->code_in_len, prof->code_in_len + tb->size);
qatomic_set(&prof->code_out_len, prof->code_out_len + gen_code_size);
qatomic_set(&prof->search_out_len, prof->search_out_len + search_size);
#endif
#ifdef DEBUG_DISAS
if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM) &&
qemu_log_in_addr_range(pc)) {
FILE *logfile = qemu_log_trylock();
if (logfile) {
int code_size, data_size;
const tcg_target_ulong *rx_data_gen_ptr;
size_t chunk_start;
int insn = 0;
if (tcg_ctx->data_gen_ptr) {
rx_data_gen_ptr = tcg_splitwx_to_rx(tcg_ctx->data_gen_ptr);
code_size = (const void *)rx_data_gen_ptr - tb->tc.ptr;
data_size = gen_code_size - code_size;
} else {
rx_data_gen_ptr = 0;
code_size = gen_code_size;
data_size = 0;
}
/* Dump header and the first instruction */
fprintf(logfile, "OUT: [size=%d]\n", gen_code_size);
fprintf(logfile,
" -- guest addr 0x" TARGET_FMT_lx " + tb prologue\n",
tcg_ctx->gen_insn_data[insn][0]);
chunk_start = tcg_ctx->gen_insn_end_off[insn];
disas(logfile, tb->tc.ptr, chunk_start);
/*
* Dump each instruction chunk, wrapping up empty chunks into
* the next instruction. The whole array is offset so the
* first entry is the beginning of the 2nd instruction.
*/
while (insn < tb->icount) {
size_t chunk_end = tcg_ctx->gen_insn_end_off[insn];
if (chunk_end > chunk_start) {
fprintf(logfile, " -- guest addr 0x" TARGET_FMT_lx "\n",
tcg_ctx->gen_insn_data[insn][0]);
disas(logfile, tb->tc.ptr + chunk_start,
chunk_end - chunk_start);
chunk_start = chunk_end;
}
insn++;
}
if (chunk_start < code_size) {
fprintf(logfile, " -- tb slow paths + alignment\n");
disas(logfile, tb->tc.ptr + chunk_start,
code_size - chunk_start);
}
/* Finally dump any data we may have after the block */
if (data_size) {
int i;
fprintf(logfile, " data: [size=%d]\n", data_size);
for (i = 0; i < data_size / sizeof(tcg_target_ulong); i++) {
if (sizeof(tcg_target_ulong) == 8) {
fprintf(logfile,
"0x%08" PRIxPTR ": .quad 0x%016" TCG_PRIlx "\n",
(uintptr_t)&rx_data_gen_ptr[i], rx_data_gen_ptr[i]);
} else if (sizeof(tcg_target_ulong) == 4) {
fprintf(logfile,
"0x%08" PRIxPTR ": .long 0x%08" TCG_PRIlx "\n",
(uintptr_t)&rx_data_gen_ptr[i], rx_data_gen_ptr[i]);
} else {
qemu_build_not_reached();
}
}
}
fprintf(logfile, "\n");
qemu_log_unlock(logfile);
}
}
#endif
qatomic_set(&tcg_ctx->code_gen_ptr, (void *)
ROUND_UP((uintptr_t)gen_code_buf + gen_code_size + search_size,
CODE_GEN_ALIGN));
/* init jump list */
qemu_spin_init(&tb->jmp_lock);
tb->jmp_list_head = (uintptr_t)NULL;
tb->jmp_list_next[0] = (uintptr_t)NULL;
tb->jmp_list_next[1] = (uintptr_t)NULL;
tb->jmp_dest[0] = (uintptr_t)NULL;
tb->jmp_dest[1] = (uintptr_t)NULL;
/* init original jump addresses which have been set during tcg_gen_code() */
if (tb->jmp_reset_offset[0] != TB_JMP_RESET_OFFSET_INVALID) {
tb_reset_jump(tb, 0);
}
if (tb->jmp_reset_offset[1] != TB_JMP_RESET_OFFSET_INVALID) {
tb_reset_jump(tb, 1);
}
/*
* If the TB is not associated with a physical RAM page then it must be
* a temporary one-insn TB, and we have nothing left to do. Return early
* before attempting to link to other TBs or add to the lookup table.
*/
if (tb_page_addr0(tb) == -1) {
return tb;
}
/*
* Insert TB into the corresponding region tree before publishing it
* through QHT. Otherwise rewinding happened in the TB might fail to
* lookup itself using host PC.
*/
tcg_tb_insert(tb);
/*
* No explicit memory barrier is required -- tb_link_page() makes the
* TB visible in a consistent state.
*/
existing_tb = tb_link_page(tb, tb_page_addr0(tb), tb_page_addr1(tb));
/* if the TB already exists, discard what we just translated */
if (unlikely(existing_tb != tb)) {