tcg: move tcg backend files into accel/tcg/

move tcg-runtime.c, translate-all.(ch) and translate-common.c into
accel/tcg/ subdirectory and updated related trace-events file.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <1496383606-18060-4-git-send-email-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 0 insertions, 2221 deletions

diff --git a/translate-all.c b/translate-all.c
deleted file mode 100644
index b3ee876..0000000
--- a/translate-all.c
+++ /dev/null
@@ -1,2221 +0,0 @@
-/*
- *  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-root.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 "qemu/main-loop.h"
-#include "exec/log.h"
-#include "sysemu/cpus.h"
-
-/* #define DEBUG_TB_INVALIDATE */
-/* #define DEBUG_TB_FLUSH */
-/* 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 CONFIG_SOFTMMU
-#define assert_memory_lock() tcg_debug_assert(have_tb_lock)
-#else
-#define assert_memory_lock() tcg_debug_assert(have_mmap_lock())
-#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 */
-__thread int have_tb_lock;
-
-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);
-}
-
-#define assert_tb_locked() tcg_debug_assert(have_tb_lock)
-#define assert_tb_unlocked() tcg_debug_assert(!have_tb_lock)
-
-void tb_lock(void)
-{
-    assert_tb_unlocked();
-    qemu_mutex_lock(&tcg_ctx.tb_ctx.tb_lock);
-    have_tb_lock++;
-}
-
-void tb_unlock(void)
-{
-    assert_tb_locked();
-    have_tb_lock--;
-    qemu_mutex_unlock(&tcg_ctx.tb_ctx.tb_lock);
-}
-
-void tb_lock_reset(void)
-{
-    if (have_tb_lock) {
-        qemu_mutex_unlock(&tcg_ctx.tb_ctx.tb_lock);
-        have_tb_lock = 0;
-    }
-}
-
-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;
-
-    /* A retaddr of zero is invalid so we really shouldn't have ended
-     * up here. The target code has likely forgotten to check retaddr
-     * != 0 before attempting to restore state. We return early to
-     * avoid blowing up on a recursive tb_lock(). The target must have
-     * previously survived a failed cpu_restore_state because
-     * tb_find_pc(0) would have failed anyway. It still should be
-     * fixed though.
-     */
-
-    if (!retaddr) {
-        return r;
-    }
-
-    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 ((int)(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_locked();
-
-    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_locked();
-
-    /* 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)
-{
-    TranslationBlock *tb = p;
-    int flags1, flags2;
-
-    flags1 = page_get_flags(tb->pc);
-    flags2 = page_get_flags(tb->pc + tb->size - 1);
-    if ((flags1 & PAGE_WRITE) || (flags2 & PAGE_WRITE)) {
-        printf("ERROR page flags: PC=%08lx size=%04x f1=%x f2=%x\n",
-               (long)tb->pc, tb->size, flags1, flags2);
-    }
-}
-
-/* verify that all the pages have correct rights for code */
-static void tb_page_check(void)
-{
-    qht_iter(&tcg_ctx.tb_ctx.htable, do_tb_page_check, NULL);
-}
-
-#endif
-
-static inline void tb_page_remove(TranslationBlock **ptb, TranslationBlock *tb)
-{
-    TranslationBlock *tb1;
-    unsigned int n1;
-
-    for (;;) {
-        tb1 = *ptb;
-        n1 = (uintptr_t)tb1 & 3;
-        tb1 = (TranslationBlock *)((uintptr_t)tb1 & ~3);
-        if (tb1 == tb) {
-            *ptb = tb1->page_next[n1];
-            break;
-        }
-        ptb = &tb1->page_next[n1];
-    }
-}
-
-/* remove the TB from a list of TBs jumping to the n-th jump target of the TB */
-static inline void tb_remove_from_jmp_list(TranslationBlock *tb, int n)
-{
-    TranslationBlock *tb1;
-    uintptr_t *ptb, ntb;
-    unsigned int n1;
-
-    ptb = &tb->jmp_list_next[n];
-    if (*ptb) {
-        /* find tb(n) in circular list */
-        for (;;) {
-            ntb = *ptb;
-            n1 = ntb & 3;
-            tb1 = (TranslationBlock *)(ntb & ~3);
-            if (n1 == n && tb1 == tb) {
-                break;
-            }
-            if (n1 == 2) {
-                ptb = &tb1->jmp_list_first;
-            } else {
-                ptb = &tb1->jmp_list_next[n1];
-            }
-        }
-        /* now we can suppress tb(n) from the list */
-        *ptb = tb->jmp_list_next[n];
-
-        tb->jmp_list_next[n] = (uintptr_t)NULL;
-    }
-}
-
-/* reset the jump entry 'n' of a TB so that it is not chained to
-   another TB */
-static inline void tb_reset_jump(TranslationBlock *tb, int n)
-{
-    uintptr_t addr = (uintptr_t)(tb->tc_ptr + tb->jmp_reset_offset[n]);
-    tb_set_jmp_target(tb, n, addr);
-}
-
-/* remove any jumps to the TB */
-static inline void tb_jmp_unlink(TranslationBlock *tb)
-{
-    TranslationBlock *tb1;
-    uintptr_t *ptb, ntb;
-    unsigned int n1;
-
-    ptb = &tb->jmp_list_first;
-    for (;;) {
-        ntb = *ptb;
-        n1 = ntb & 3;
-        tb1 = (TranslationBlock *)(ntb & ~3);
-        if (n1 == 2) {
-            break;
-        }
-        tb_reset_jump(tb1, n1);
-        *ptb = tb1->jmp_list_next[n1];
-        tb1->jmp_list_next[n1] = (uintptr_t)NULL;
-    }
-}
-
-/* invalidate one TB
- *
- * Called with tb_lock held.
- */
-void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr)
-{
-    CPUState *cpu;
-    PageDesc *p;
-    uint32_t h;
-    tb_page_addr_t phys_pc;
-
-    assert_tb_locked();
-
-    atomic_set(&tb->invalid, true);
-
-    /* remove the TB from the hash list */
-    phys_pc = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
-    h = tb_hash_func(phys_pc, tb->pc, tb->flags);
-    qht_remove(&tcg_ctx.tb_ctx.htable, tb, h);
-
-    /* remove the TB from the page list */
-    if (tb->page_addr[0] != page_addr) {
-        p = page_find(tb->page_addr[0] >> TARGET_PAGE_BITS);
-        tb_page_remove(&p->first_tb, tb);
-        invalidate_page_bitmap(p);
-    }
-    if (tb->page_addr[1] != -1 && tb->page_addr[1] != page_addr) {
-        p = page_find(tb->page_addr[1] >> TARGET_PAGE_BITS);
-        tb_page_remove(&p->first_tb, tb);
-        invalidate_page_bitmap(p);
-    }
-
-    /* remove the TB from the hash list */
-    h = tb_jmp_cache_hash_func(tb->pc);
-    CPU_FOREACH(cpu) {
-        if (atomic_read(&cpu->tb_jmp_cache[h]) == tb) {
-            atomic_set(&cpu->tb_jmp_cache[h], NULL);
-        }
-    }
-
-    /* suppress this TB from the two jump lists */
-    tb_remove_from_jmp_list(tb, 0);
-    tb_remove_from_jmp_list(tb, 1);
-
-    /* suppress any remaining jumps to this TB */
-    tb_jmp_unlink(tb);
-
-    tcg_ctx.tb_ctx.tb_phys_invalidate_count++;
-}
-
-#ifdef CONFIG_SOFTMMU
-static void build_page_bitmap(PageDesc *p)
-{
-    int n, tb_start, tb_end;
-    TranslationBlock *tb;
-
-    p->code_bitmap = bitmap_new(TARGET_PAGE_SIZE);
-
-    tb = p->first_tb;
-    while (tb != NULL) {
-        n = (uintptr_t)tb & 3;
-        tb = (TranslationBlock *)((uintptr_t)tb & ~3);
-        /* NOTE: this is subtle as a TB may span two physical pages */
-        if (n == 0) {
-            /* NOTE: tb_end may be after the end of the page, but
-               it is not a problem */
-            tb_start = tb->pc & ~TARGET_PAGE_MASK;
-            tb_end = tb_start + tb->size;
-            if (tb_end > TARGET_PAGE_SIZE) {
-                tb_end = TARGET_PAGE_SIZE;
-             }
-        } else {
-            tb_start = 0;
-            tb_end = ((tb->pc + tb->size) & ~TARGET_PAGE_MASK);
-        }
-        bitmap_set(p->code_bitmap, tb_start, tb_end - tb_start);
-        tb = tb->page_next[n];
-    }
-}
-#endif
-
-/* add the tb in the target page and protect it if necessary
- *
- * Called with mmap_lock held for user-mode emulation.
- */
-static inline void tb_alloc_page(TranslationBlock *tb,
-                                 unsigned int n, tb_page_addr_t page_addr)
-{
-    PageDesc *p;
-#ifndef CONFIG_USER_ONLY
-    bool page_already_protected;
-#endif
-
-    assert_memory_lock();
-
-    tb->page_addr[n] = page_addr;
-    p = page_find_alloc(page_addr >> TARGET_PAGE_BITS, 1);
-    tb->page_next[n] = p->first_tb;
-#ifndef CONFIG_USER_ONLY
-    page_already_protected = p->first_tb != NULL;
-#endif
-    p->first_tb = (TranslationBlock *)((uintptr_t)tb | n);
-    invalidate_page_bitmap(p);
-
-#if defined(CONFIG_USER_ONLY)
-    if (p->flags & PAGE_WRITE) {
-        target_ulong addr;
-        PageDesc *p2;
-        int prot;
-
-        /* force the host page as non writable (writes will have a
-           page fault + mprotect overhead) */
-        page_addr &= qemu_host_page_mask;
-        prot = 0;
-        for (addr = page_addr; addr < page_addr + qemu_host_page_size;
-            addr += TARGET_PAGE_SIZE) {
-
-            p2 = page_find(addr >> TARGET_PAGE_BITS);
-            if (!p2) {
-                continue;
-            }
-            prot |= p2->flags;
-            p2->flags &= ~PAGE_WRITE;
-          }
-        mprotect(g2h(page_addr), qemu_host_page_size,
-                 (prot & PAGE_BITS) & ~PAGE_WRITE);
-#ifdef DEBUG_TB_INVALIDATE
-        printf("protecting code page: 0x" TARGET_FMT_lx "\n",
-               page_addr);
-#endif
-    }
-#else
-    /* if some code is already present, then the pages are already
-       protected. So we handle the case where only the first TB is
-       allocated in a physical page */
-    if (!page_already_protected) {
-        tlb_protect_code(page_addr);
-    }
-#endif
-}
-
-/* add a new TB and link it to the physical page tables. phys_page2 is
- * (-1) to indicate that only one page contains the TB.
- *
- * Called with mmap_lock held for user-mode emulation.
- */
-static void tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
-                         tb_page_addr_t phys_page2)
-{
-    uint32_t h;
-
-    assert_memory_lock();
-
-    /* add in the page list */
-    tb_alloc_page(tb, 0, phys_pc & TARGET_PAGE_MASK);
-    if (phys_page2 != -1) {
-        tb_alloc_page(tb, 1, phys_page2);
-    } else {
-        tb->page_addr[1] = -1;
-    }
-
-    /* add in the hash table */
-    h = tb_hash_func(phys_pc, tb->pc, tb->flags);
-    qht_insert(&tcg_ctx.tb_ctx.htable, tb, h);
-
-#ifdef DEBUG_TB_CHECK
-    tb_page_check();
-#endif
-}
-
-/* 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;
-    tb_page_addr_t phys_pc, phys_page2;
-    target_ulong virt_page2;
-    tcg_insn_unit *gen_code_buf;
-    int gen_code_size, search_size;
-#ifdef CONFIG_PROFILER
-    int64_t ti;
-#endif
-    assert_memory_lock();
-
-    phys_pc = get_page_addr_code(env, pc);
-    if (use_icount && !(cflags & CF_IGNORE_ICOUNT)) {
-        cflags |= CF_USE_ICOUNT;
-    }
-
-    tb = tb_alloc(pc);
-    if (unlikely(!tb)) {
- buffer_overflow:
-        /* 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 = gen_code_buf;
-    tb->cs_base = cs_base;
-    tb->flags = flags;
-    tb->cflags = cflags;
-
-#ifdef CONFIG_PROFILER
-    tcg_ctx.tb_count1++; /* includes aborted translations because of
-                       exceptions */
-    ti = profile_getclock();
-#endif
-
-    tcg_func_start(&tcg_ctx);
-
-    tcg_ctx.cpu = ENV_GET_CPU(env);
-    gen_intermediate_code(env, tb);
-    tcg_ctx.cpu = NULL;
-
-    trace_translate_block(tb, 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;
-#ifdef USE_DIRECT_JUMP
-    tcg_ctx.tb_jmp_insn_offset = tb->jmp_insn_offset;
-    tcg_ctx.tb_jmp_target_addr = NULL;
-#else
-    tcg_ctx.tb_jmp_insn_offset = NULL;
-    tcg_ctx.tb_jmp_target_addr = tb->jmp_target_addr;
-#endif
-
-#ifdef CONFIG_PROFILER
-    tcg_ctx.tb_count++;
-    tcg_ctx.interm_time += profile_getclock() - ti;
-    tcg_ctx.code_time -= profile_getclock();
-#endif
-
-    /* ??? Overflow could be handled better here.  In particular, 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.  */
-    gen_code_size = tcg_gen_code(&tcg_ctx, tb);
-    if (unlikely(gen_code_size < 0)) {
-        goto buffer_overflow;
-    }
-    search_size = encode_search(tb, (void *)gen_code_buf + gen_code_size);
-    if (unlikely(search_size < 0)) {
-        goto buffer_overflow;
-    }
-
-#ifdef CONFIG_PROFILER
-    tcg_ctx.code_time += profile_getclock();
-    tcg_ctx.code_in_len += tb->size;
-    tcg_ctx.code_out_len += gen_code_size;
-    tcg_ctx.search_out_len += search_size;
-#endif
-
-#ifdef DEBUG_DISAS
-    if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM) &&
-        qemu_log_in_addr_range(tb->pc)) {
-        qemu_log_lock();
-        qemu_log("OUT: [size=%d]\n", gen_code_size);
-        log_disas(tb->tc_ptr, gen_code_size);
-        qemu_log("\n");
-        qemu_log_flush();
-        qemu_log_unlock();
-    }
-#endif
-
-    tcg_ctx.code_gen_ptr = (void *)
-        ROUND_UP((uintptr_t)gen_code_buf + gen_code_size + search_size,
-                 CODE_GEN_ALIGN);
-
-    /* init jump list */
-    assert(((uintptr_t)tb & 3) == 0);
-    tb->jmp_list_first = (uintptr_t)tb | 2;
-    tb->jmp_list_next[0] = (uintptr_t)NULL;
-    tb->jmp_list_next[1] = (uintptr_t)NULL;
-
-    /* init original jump addresses wich has 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);
-    }
-
-    /* check next page if needed */
-    virt_page2 = (pc + tb->size - 1) & TARGET_PAGE_MASK;
-    phys_page2 = -1;
-    if ((pc & TARGET_PAGE_MASK) != virt_page2) {
-        phys_page2 = get_page_addr_code(env, virt_page2);
-    }
-    /* As long as consistency of the TB stuff is provided by tb_lock in user
-     * mode and is implicit in single-threaded softmmu emulation, no explicit
-     * memory barrier is required before tb_link_page() makes the TB visible
-     * through the physical hash table and physical page list.
-     */
-    tb_link_page(tb, phys_pc, phys_page2);
-    return tb;
-}
-
-/*
- * Invalidate all TBs which intersect with the target physical address range
- * [start;end[. NOTE: start and end may refer to *different* physical pages.
- * 'is_cpu_write_access' should be true if called from a real cpu write
- * access: the virtual CPU will exit the current TB if code is modified inside
- * this TB.
- *
- * Called with mmap_lock held for user-mode emulation, grabs tb_lock
- * Called with tb_lock held for system-mode emulation
- */
-static void tb_invalidate_phys_range_1(tb_page_addr_t start, tb_page_addr_t end)
-{
-    while (start < end) {
-        tb_invalidate_phys_page_range(start, end, 0);
-        start &= TARGET_PAGE_MASK;
-        start += TARGET_PAGE_SIZE;
-    }
-}
-
-#ifdef CONFIG_SOFTMMU
-void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
-{
-    assert_tb_locked();
-    tb_invalidate_phys_range_1(start, end);
-}
-#else
-void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
-{
-    assert_memory_lock();
-    tb_lock();
-    tb_invalidate_phys_range_1(start, end);
-    tb_unlock();
-}
-#endif
-/*
- * Invalidate all TBs which intersect with the target physical address range
- * [start;end[. NOTE: start and end must refer to the *same* physical page.
- * 'is_cpu_write_access' should be true if called from a real cpu write
- * access: the virtual CPU will exit the current TB if code is modified inside
- * this TB.
- *
- * Called with tb_lock/mmap_lock held for user-mode emulation
- * Called with tb_lock held for system-mode emulation
- */
-void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end,
-                                   int is_cpu_write_access)
-{
-    TranslationBlock *tb, *tb_next;
-#if defined(TARGET_HAS_PRECISE_SMC)
-    CPUState *cpu = current_cpu;
-    CPUArchState *env = NULL;
-#endif
-    tb_page_addr_t tb_start, tb_end;
-    PageDesc *p;
-    int n;
-#ifdef TARGET_HAS_PRECISE_SMC
-    int current_tb_not_found = is_cpu_write_access;
-    TranslationBlock *current_tb = NULL;
-    int current_tb_modified = 0;
-    target_ulong current_pc = 0;
-    target_ulong current_cs_base = 0;
-    uint32_t current_flags = 0;
-#endif /* TARGET_HAS_PRECISE_SMC */
-
-    assert_memory_lock();
-    assert_tb_locked();
-
-    p = page_find(start >> TARGET_PAGE_BITS);
-    if (!p) {
-        return;
-    }
-#if defined(TARGET_HAS_PRECISE_SMC)
-    if (cpu != NULL) {
-        env = cpu->env_ptr;
-    }
-#endif
-
-    /* we remove all the TBs in the range [start, end[ */
-    /* XXX: see if in some cases it could be faster to invalidate all
-       the code */
-    tb = p->first_tb;
-    while (tb != NULL) {
-        n = (uintptr_t)tb & 3;
-        tb = (TranslationBlock *)((uintptr_t)tb & ~3);
-        tb_next = tb->page_next[n];
-        /* NOTE: this is subtle as a TB may span two physical pages */
-        if (n == 0) {
-            /* NOTE: tb_end may be after the end of the page, but
-               it is not a problem */
-            tb_start = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
-            tb_end = tb_start + tb->size;
-        } else {
-            tb_start = tb->page_addr[1];
-            tb_end = tb_start + ((tb->pc + tb->size) & ~TARGET_PAGE_MASK);
-        }
-        if (!(tb_end <= start || tb_start >= end)) {
-#ifdef TARGET_HAS_PRECISE_SMC
-            if (current_tb_not_found) {
-                current_tb_not_found = 0;
-                current_tb = NULL;
-                if (cpu->mem_io_pc) {
-                    /* now we have a real cpu fault */
-                    current_tb = tb_find_pc(cpu->mem_io_pc);
-                }
-            }
-            if (current_tb == tb &&
-                (current_tb->cflags & CF_COUNT_MASK) != 1) {
-                /* If we are modifying the current TB, we must stop
-                its execution. We could be more precise by checking
-                that the modification is after the current PC, but it
-                would require a specialized function to partially
-                restore the CPU state */
-
-                current_tb_modified = 1;
-                cpu_restore_state_from_tb(cpu, current_tb, cpu->mem_io_pc);
-                cpu_get_tb_cpu_state(env, &current_pc, &current_cs_base,
-                                     &current_flags);
-            }
-#endif /* TARGET_HAS_PRECISE_SMC */
-            tb_phys_invalidate(tb, -1);
-        }
-        tb = tb_next;
-    }
-#if !defined(CONFIG_USER_ONLY)
-    /* if no code remaining, no need to continue to use slow writes */
-    if (!p->first_tb) {
-        invalidate_page_bitmap(p);
-        tlb_unprotect_code(start);
-    }
-#endif
-#ifdef TARGET_HAS_PRECISE_SMC
-    if (current_tb_modified) {
-        /* we generate a block containing just the instruction
-           modifying the memory. It will ensure that it cannot modify
-           itself */
-        tb_gen_code(cpu, current_pc, current_cs_base, current_flags, 1);
-        cpu_loop_exit_noexc(cpu);
-    }
-#endif
-}
-
-#ifdef CONFIG_SOFTMMU
-/* len must be <= 8 and start must be a multiple of len.
- * Called via softmmu_template.h when code areas are written to with
- * iothread mutex not held.
- */
-void tb_invalidate_phys_page_fast(tb_page_addr_t start, int len)
-{
-    PageDesc *p;
-
-#if 0
-    if (1) {
-        qemu_log("modifying code at 0x%x size=%d EIP=%x PC=%08x\n",
-                  cpu_single_env->mem_io_vaddr, len,
-                  cpu_single_env->eip,
-                  cpu_single_env->eip +
-                  (intptr_t)cpu_single_env->segs[R_CS].base);
-    }
-#endif
-    assert_memory_lock();
-
-    p = page_find(start >> TARGET_PAGE_BITS);
-    if (!p) {
-        return;
-    }
-    if (!p->code_bitmap &&
-        ++p->code_write_count >= SMC_BITMAP_USE_THRESHOLD) {
-        /* build code bitmap.  FIXME: writes should be protected by
-         * tb_lock, reads by tb_lock or RCU.
-         */
-        build_page_bitmap(p);
-    }
-    if (p->code_bitmap) {
-        unsigned int nr;
-        unsigned long b;
-
-        nr = start & ~TARGET_PAGE_MASK;
-        b = p->code_bitmap[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG - 1));
-        if (b & ((1 << len) - 1)) {
-            goto do_invalidate;
-        }
-    } else {
-    do_invalidate:
-        tb_invalidate_phys_page_range(start, start + len, 1);
-    }
-}
-#else
-/* Called with mmap_lock held. If pc is not 0 then it indicates the
- * host PC of the faulting store instruction that caused this invalidate.
- * Returns true if the caller needs to abort execution of the current
- * TB (because it was modified by this store and the guest CPU has
- * precise-SMC semantics).
- */
-static bool tb_invalidate_phys_page(tb_page_addr_t addr, uintptr_t pc)
-{
-    TranslationBlock *tb;
-    PageDesc *p;
-    int n;
-#ifdef TARGET_HAS_PRECISE_SMC
-    TranslationBlock *current_tb = NULL;
-    CPUState *cpu = current_cpu;
-    CPUArchState *env = NULL;
-    int current_tb_modified = 0;
-    target_ulong current_pc = 0;
-    target_ulong current_cs_base = 0;
-    uint32_t current_flags = 0;
-#endif
-
-    assert_memory_lock();
-
-    addr &= TARGET_PAGE_MASK;
-    p = page_find(addr >> TARGET_PAGE_BITS);
-    if (!p) {
-        return false;
-    }
-
-    tb_lock();
-    tb = p->first_tb;
-#ifdef TARGET_HAS_PRECISE_SMC
-    if (tb && pc != 0) {
-        current_tb = tb_find_pc(pc);
-    }
-    if (cpu != NULL) {
-        env = cpu->env_ptr;
-    }
-#endif
-    while (tb != NULL) {
-        n = (uintptr_t)tb & 3;
-        tb = (TranslationBlock *)((uintptr_t)tb & ~3);
-#ifdef TARGET_HAS_PRECISE_SMC
-        if (current_tb == tb &&
-            (current_tb->cflags & CF_COUNT_MASK) != 1) {
-                /* If we are modifying the current TB, we must stop
-                   its execution. We could be more precise by checking
-                   that the modification is after the current PC, but it
-                   would require a specialized function to partially
-                   restore the CPU state */
-
-            current_tb_modified = 1;
-            cpu_restore_state_from_tb(cpu, current_tb, pc);
-            cpu_get_tb_cpu_state(env, &current_pc, &current_cs_base,
-                                 &current_flags);
-        }
-#endif /* TARGET_HAS_PRECISE_SMC */
-        tb_phys_invalidate(tb, addr);
-        tb = tb->page_next[n];
-    }
-    p->first_tb = NULL;
-#ifdef TARGET_HAS_PRECISE_SMC
-    if (current_tb_modified) {
-        /* we generate a block containing just the instruction
-           modifying the memory. It will ensure that it cannot modify
-           itself */
-        tb_gen_code(cpu, current_pc, current_cs_base, current_flags, 1);
-        /* tb_lock will be reset after cpu_loop_exit_noexc longjmps
-         * back into the cpu_exec loop. */
-        return true;
-    }
-#endif
-    tb_unlock();
-
-    return false;
-}
-#endif
-
-/* find the TB 'tb' such that tb[0].tc_ptr <= tc_ptr <
-   tb[1].tc_ptr. Return NULL if not found */
-static TranslationBlock *tb_find_pc(uintptr_t tc_ptr)
-{
-    int m_min, m_max, m;
-    uintptr_t v;
-    TranslationBlock *tb;
-
-    if (tcg_ctx.tb_ctx.nb_tbs <= 0) {
-        return NULL;
-    }
-    if (tc_ptr < (uintptr_t)tcg_ctx.code_gen_buffer ||
-        tc_ptr >= (uintptr_t)tcg_ctx.code_gen_ptr) {
-        return NULL;
-    }
-    /* binary search (cf Knuth) */
-    m_min = 0;
-    m_max = tcg_ctx.tb_ctx.nb_tbs - 1;
-    while (m_min <= m_max) {
-        m = (m_min + m_max) >> 1;
-        tb = &tcg_ctx.tb_ctx.tbs[m];
-        v = (uintptr_t)tb->tc_ptr;
-        if (v == tc_ptr) {
-            return tb;
-        } else if (tc_ptr < v) {
-            m_max = m - 1;
-        } else {
-            m_min = m + 1;
-        }
-    }
-    return &tcg_ctx.tb_ctx.tbs[m_max];
-}
-
-#if !defined(CONFIG_USER_ONLY)
-void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr)
-{
-    ram_addr_t ram_addr;
-    MemoryRegion *mr;
-    hwaddr l = 1;
-
-    rcu_read_lock();
-    mr = address_space_translate(as, addr, &addr, &l, false);
-    if (!(memory_region_is_ram(mr)
-          || memory_region_is_romd(mr))) {
-        rcu_read_unlock();
-        return;
-    }
-    ram_addr = memory_region_get_ram_addr(mr) + addr;
-    tb_lock();
-    tb_invalidate_phys_page_range(ram_addr, ram_addr + 1, 0);
-    tb_unlock();
-    rcu_read_unlock();
-}
-#endif /* !defined(CONFIG_USER_ONLY) */
-
-/* Called with tb_lock held.  */
-void tb_check_watchpoint(CPUState *cpu)
-{
-    TranslationBlock *tb;
-
-    tb = tb_find_pc(cpu->mem_io_pc);
-    if (tb) {
-        /* We can use retranslation to find the PC.  */
-        cpu_restore_state_from_tb(cpu, tb, cpu->mem_io_pc);
-        tb_phys_invalidate(tb, -1);
-    } else {
-        /* The exception probably happened in a helper.  The CPU state should
-           have been saved before calling it. Fetch the PC from there.  */
-        CPUArchState *env = cpu->env_ptr;
-        target_ulong pc, cs_base;
-        tb_page_addr_t addr;
-        uint32_t flags;
-
-        cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
-        addr = get_page_addr_code(env, pc);
-        tb_invalidate_phys_range(addr, addr + 1);
-    }
-}
-
-#ifndef CONFIG_USER_ONLY
-/* in deterministic execution mode, instructions doing device I/Os
- * must be at the end of the TB.
- *
- * Called by softmmu_template.h, with iothread mutex not held.
- */
-void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr)
-{
-#if defined(TARGET_MIPS) || defined(TARGET_SH4)
-    CPUArchState *env = cpu->env_ptr;
-#endif
-    TranslationBlock *tb;
-    uint32_t n, cflags;
-    target_ulong pc, cs_base;
-    uint32_t flags;
-
-    tb_lock();
-    tb = tb_find_pc(retaddr);
-    if (!tb) {
-        cpu_abort(cpu, "cpu_io_recompile: could not find TB for pc=%p",
-                  (void *)retaddr);
-    }
-    n = cpu->icount_decr.u16.low + tb->icount;
-    cpu_restore_state_from_tb(cpu, tb, retaddr);
-    /* Calculate how many instructions had been executed before the fault
-       occurred.  */
-    n = n - cpu->icount_decr.u16.low;
-    /* Generate a new TB ending on the I/O insn.  */
-    n++;
-    /* On MIPS and SH, delay slot instructions can only be restarted if
-       they were already the first instruction in the TB.  If this is not
-       the first instruction in a TB then re-execute the preceding
-       branch.  */
-#if defined(TARGET_MIPS)
-    if ((env->hflags & MIPS_HFLAG_BMASK) != 0 && n > 1) {
-        env->active_tc.PC -= (env->hflags & MIPS_HFLAG_B16 ? 2 : 4);
-        cpu->icount_decr.u16.low++;
-        env->hflags &= ~MIPS_HFLAG_BMASK;
-    }
-#elif defined(TARGET_SH4)
-    if ((env->flags & ((DELAY_SLOT | DELAY_SLOT_CONDITIONAL))) != 0
-            && n > 1) {
-        env->pc -= 2;
-        cpu->icount_decr.u16.low++;
-        env->flags &= ~(DELAY_SLOT | DELAY_SLOT_CONDITIONAL);
-    }
-#endif
-    /* This should never happen.  */
-    if (n > CF_COUNT_MASK) {
-        cpu_abort(cpu, "TB too big during recompile");
-    }
-
-    cflags = n | CF_LAST_IO;
-    pc = tb->pc;
-    cs_base = tb->cs_base;
-    flags = tb->flags;
-    tb_phys_invalidate(tb, -1);
-    if (tb->cflags & CF_NOCACHE) {
-        if (tb->orig_tb) {
-            /* Invalidate original TB if this TB was generated in
-             * cpu_exec_nocache() */
-            tb_phys_invalidate(tb->orig_tb, -1);
-        }
-        tb_free(tb);
-    }
-    /* FIXME: In theory this could raise an exception.  In practice
-       we have already translated the block once so it's probably ok.  */
-    tb_gen_code(cpu, pc, cs_base, flags, cflags);
-
-    /* TODO: If env->pc != tb->pc (i.e. the faulting instruction was not
-     * the first in the TB) then we end up generating a whole new TB and
-     *  repeating the fault, which is horribly inefficient.
-     *  Better would be to execute just this insn uncached, or generate a
-     *  second new TB.
-     *
-     * cpu_loop_exit_noexc will longjmp back to cpu_exec where the
-     * tb_lock gets reset.
-     */
-    cpu_loop_exit_noexc(cpu);
-}
-
-void tb_flush_jmp_cache(CPUState *cpu, target_ulong addr)
-{
-    unsigned int i;
-
-    /* Discard jump cache entries for any tb which might potentially
-       overlap the flushed page.  */
-    i = tb_jmp_cache_hash_page(addr - TARGET_PAGE_SIZE);
-    memset(&cpu->tb_jmp_cache[i], 0,
-           TB_JMP_PAGE_SIZE * sizeof(TranslationBlock *));
-
-    i = tb_jmp_cache_hash_page(addr);
-    memset(&cpu->tb_jmp_cache[i], 0,
-           TB_JMP_PAGE_SIZE * sizeof(TranslationBlock *));
-}
-
-static void print_qht_statistics(FILE *f, fprintf_function cpu_fprintf,
-                                 struct qht_stats hst)
-{
-    uint32_t hgram_opts;
-    size_t hgram_bins;
-    char *hgram;
-
-    if (!hst.head_buckets) {
-        return;
-    }
-    cpu_fprintf(f, "TB hash buckets     %zu/%zu (%0.2f%% head buckets used)\n",
-                hst.used_head_buckets, hst.head_buckets,
-                (double)hst.used_head_buckets / hst.head_buckets * 100);
-
-    hgram_opts =  QDIST_PR_BORDER | QDIST_PR_LABELS;
-    hgram_opts |= QDIST_PR_100X   | QDIST_PR_PERCENT;
-    if (qdist_xmax(&hst.occupancy) - qdist_xmin(&hst.occupancy) == 1) {
-        hgram_opts |= QDIST_PR_NODECIMAL;
-    }
-    hgram = qdist_pr(&hst.occupancy, 10, hgram_opts);
-    cpu_fprintf(f, "TB hash occupancy   %0.2f%% avg chain occ. Histogram: %s\n",
-                qdist_avg(&hst.occupancy) * 100, hgram);
-    g_free(hgram);
-
-    hgram_opts = QDIST_PR_BORDER | QDIST_PR_LABELS;
-    hgram_bins = qdist_xmax(&hst.chain) - qdist_xmin(&hst.chain);
-    if (hgram_bins > 10) {
-        hgram_bins = 10;
-    } else {
-        hgram_bins = 0;
-        hgram_opts |= QDIST_PR_NODECIMAL | QDIST_PR_NOBINRANGE;
-    }
-    hgram = qdist_pr(&hst.chain, hgram_bins, hgram_opts);
-    cpu_fprintf(f, "TB hash avg chain   %0.3f buckets. Histogram: %s\n",
-                qdist_avg(&hst.chain), hgram);
-    g_free(hgram);
-}
-
-void dump_exec_info(FILE *f, fprintf_function cpu_fprintf)
-{
-    int i, target_code_size, max_target_code_size;
-    int direct_jmp_count, direct_jmp2_count, cross_page;
-    TranslationBlock *tb;
-    struct qht_stats hst;
-
-    tb_lock();
-
-    target_code_size = 0;
-    max_target_code_size = 0;
-    cross_page = 0;
-    direct_jmp_count = 0;
-    direct_jmp2_count = 0;
-    for (i = 0; i < tcg_ctx.tb_ctx.nb_tbs; i++) {
-        tb = &tcg_ctx.tb_ctx.tbs[i];
-        target_code_size += tb->size;
-        if (tb->size > max_target_code_size) {
-            max_target_code_size = tb->size;
-        }
-        if (tb->page_addr[1] != -1) {
-            cross_page++;
-        }
-        if (tb->jmp_reset_offset[0] != TB_JMP_RESET_OFFSET_INVALID) {
-            direct_jmp_count++;
-            if (tb->jmp_reset_offset[1] != TB_JMP_RESET_OFFSET_INVALID) {
-                direct_jmp2_count++;
-            }
-        }
-    }
-    /* XXX: avoid using doubles ? */
-    cpu_fprintf(f, "Translation buffer state:\n");
-    cpu_fprintf(f, "gen code size       %td/%zd\n",
-                tcg_ctx.code_gen_ptr - tcg_ctx.code_gen_buffer,
-                tcg_ctx.code_gen_highwater - tcg_ctx.code_gen_buffer);
-    cpu_fprintf(f, "TB count            %d/%d\n",
-            tcg_ctx.tb_ctx.nb_tbs, tcg_ctx.code_gen_max_blocks);
-    cpu_fprintf(f, "TB avg target size  %d max=%d bytes\n",
-            tcg_ctx.tb_ctx.nb_tbs ? target_code_size /
-                    tcg_ctx.tb_ctx.nb_tbs : 0,
-            max_target_code_size);
-    cpu_fprintf(f, "TB avg host size    %td bytes (expansion ratio: %0.1f)\n",
-            tcg_ctx.tb_ctx.nb_tbs ? (tcg_ctx.code_gen_ptr -
-                                     tcg_ctx.code_gen_buffer) /
-                                     tcg_ctx.tb_ctx.nb_tbs : 0,
-                target_code_size ? (double) (tcg_ctx.code_gen_ptr -
-                                             tcg_ctx.code_gen_buffer) /
-                                             target_code_size : 0);
-    cpu_fprintf(f, "cross page TB count %d (%d%%)\n", cross_page,
-            tcg_ctx.tb_ctx.nb_tbs ? (cross_page * 100) /
-                                    tcg_ctx.tb_ctx.nb_tbs : 0);
-    cpu_fprintf(f, "direct jump count   %d (%d%%) (2 jumps=%d %d%%)\n",
-                direct_jmp_count,
-                tcg_ctx.tb_ctx.nb_tbs ? (direct_jmp_count * 100) /
-                        tcg_ctx.tb_ctx.nb_tbs : 0,
-                direct_jmp2_count,
-                tcg_ctx.tb_ctx.nb_tbs ? (direct_jmp2_count * 100) /
-                        tcg_ctx.tb_ctx.nb_tbs : 0);
-
-    qht_statistics_init(&tcg_ctx.tb_ctx.htable, &hst);
-    print_qht_statistics(f, cpu_fprintf, hst);
-    qht_statistics_destroy(&hst);
-
-    cpu_fprintf(f, "\nStatistics:\n");
-    cpu_fprintf(f, "TB flush count      %u\n",
-            atomic_read(&tcg_ctx.tb_ctx.tb_flush_count));
-    cpu_fprintf(f, "TB invalidate count %d\n",
-            tcg_ctx.tb_ctx.tb_phys_invalidate_count);
-    cpu_fprintf(f, "TLB flush count     %d\n", tlb_flush_count);
-    tcg_dump_info(f, cpu_fprintf);
-
-    tb_unlock();
-}
-
-void dump_opcount_info(FILE *f, fprintf_function cpu_fprintf)
-{
-    tcg_dump_op_count(f, cpu_fprintf);
-}
-
-#else /* CONFIG_USER_ONLY */
-
-void cpu_interrupt(CPUState *cpu, int mask)
-{
-    g_assert(qemu_mutex_iothread_locked());
-    cpu->interrupt_request |= mask;
-    cpu->icount_decr.u16.high = -1;
-}
-
-/*
- * Walks guest process memory "regions" one by one
- * and calls callback function 'fn' for each region.
- */
-struct walk_memory_regions_data {
-    walk_memory_regions_fn fn;
-    void *priv;
-    target_ulong start;
-    int prot;
-};
-
-static int walk_memory_regions_end(struct walk_memory_regions_data *data,
-                                   target_ulong end, int new_prot)
-{
-    if (data->start != -1u) {
-        int rc = data->fn(data->priv, data->start, end, data->prot);
-        if (rc != 0) {
-            return rc;
-        }
-    }
-
-    data->start = (new_prot ? end : -1u);
-    data->prot = new_prot;
-
-    return 0;
-}
-
-static int walk_memory_regions_1(struct walk_memory_regions_data *data,
-                                 target_ulong base, int level, void **lp)
-{
-    target_ulong pa;
-    int i, rc;
-
-    if (*lp == NULL) {
-        return walk_memory_regions_end(data, base, 0);
-    }
-
-    if (level == 0) {
-        PageDesc *pd = *lp;
-
-        for (i = 0; i < V_L2_SIZE; ++i) {
-            int prot = pd[i].flags;
-
-            pa = base | (i << TARGET_PAGE_BITS);
-            if (prot != data->prot) {
-                rc = walk_memory_regions_end(data, pa, prot);
-                if (rc != 0) {
-                    return rc;
-                }
-            }
-        }
-    } else {
-        void **pp = *lp;
-
-        for (i = 0; i < V_L2_SIZE; ++i) {
-            pa = base | ((target_ulong)i <<
-                (TARGET_PAGE_BITS + V_L2_BITS * level));
-            rc = walk_memory_regions_1(data, pa, level - 1, pp + i);
-            if (rc != 0) {
-                return rc;
-            }
-        }
-    }
-
-    return 0;
-}
-
-int walk_memory_regions(void *priv, walk_memory_regions_fn fn)
-{
-    struct walk_memory_regions_data data;
-    uintptr_t i, l1_sz = v_l1_size;
-
-    data.fn = fn;
-    data.priv = priv;
-    data.start = -1u;
-    data.prot = 0;
-
-    for (i = 0; i < l1_sz; i++) {
-        target_ulong base = i << (v_l1_shift + TARGET_PAGE_BITS);
-        int rc = walk_memory_regions_1(&data, base, v_l2_levels, l1_map + i);
-        if (rc != 0) {
-            return rc;
-        }
-    }
-
-    return walk_memory_regions_end(&data, 0, 0);
-}
-
-static int dump_region(void *priv, target_ulong start,
-    target_ulong end, unsigned long prot)
-{
-    FILE *f = (FILE *)priv;
-
-    (void) fprintf(f, TARGET_FMT_lx"-"TARGET_FMT_lx
-        " "TARGET_FMT_lx" %c%c%c\n",
-        start, end, end - start,
-        ((prot & PAGE_READ) ? 'r' : '-'),
-        ((prot & PAGE_WRITE) ? 'w' : '-'),
-        ((prot & PAGE_EXEC) ? 'x' : '-'));
-
-    return 0;
-}
-
-/* dump memory mappings */
-void page_dump(FILE *f)
-{
-    const int length = sizeof(target_ulong) * 2;
-    (void) fprintf(f, "%-*s %-*s %-*s %s\n",
-            length, "start", length, "end", length, "size", "prot");
-    walk_memory_regions(f, dump_region);
-}
-
-int page_get_flags(target_ulong address)
-{
-    PageDesc *p;
-
-    p = page_find(address >> TARGET_PAGE_BITS);
-    if (!p) {
-        return 0;
-    }
-    return p->flags;
-}
-
-/* Modify the flags of a page and invalidate the code if necessary.
-   The flag PAGE_WRITE_ORG is positioned automatically depending
-   on PAGE_WRITE.  The mmap_lock should already be held.  */
-void page_set_flags(target_ulong start, target_ulong end, int flags)
-{
-    target_ulong addr, len;
-
-    /* This function should never be called with addresses outside the
-       guest address space.  If this assert fires, it probably indicates
-       a missing call to h2g_valid.  */
-#if TARGET_ABI_BITS > L1_MAP_ADDR_SPACE_BITS
-    assert(end < ((target_ulong)1 << L1_MAP_ADDR_SPACE_BITS));
-#endif
-    assert(start < end);
-    assert_memory_lock();
-
-    start = start & TARGET_PAGE_MASK;
-    end = TARGET_PAGE_ALIGN(end);
-
-    if (flags & PAGE_WRITE) {
-        flags |= PAGE_WRITE_ORG;
-    }
-
-    for (addr = start, len = end - start;
-         len != 0;
-         len -= TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
-        PageDesc *p = page_find_alloc(addr >> TARGET_PAGE_BITS, 1);
-
-        /* If the write protection bit is set, then we invalidate
-           the code inside.  */
-        if (!(p->flags & PAGE_WRITE) &&
-            (flags & PAGE_WRITE) &&
-            p->first_tb) {
-            tb_invalidate_phys_page(addr, 0);
-        }
-        p->flags = flags;
-    }
-}
-
-int page_check_range(target_ulong start, target_ulong len, int flags)
-{
-    PageDesc *p;
-    target_ulong end;
-    target_ulong addr;
-
-    /* This function should never be called with addresses outside the
-       guest address space.  If this assert fires, it probably indicates
-       a missing call to h2g_valid.  */
-#if TARGET_ABI_BITS > L1_MAP_ADDR_SPACE_BITS
-    assert(start < ((target_ulong)1 << L1_MAP_ADDR_SPACE_BITS));
-#endif
-
-    if (len == 0) {
-        return 0;
-    }
-    if (start + len - 1 < start) {
-        /* We've wrapped around.  */
-        return -1;
-    }
-
-    /* must do before we loose bits in the next step */
-    end = TARGET_PAGE_ALIGN(start + len);
-    start = start & TARGET_PAGE_MASK;
-
-    for (addr = start, len = end - start;
-         len != 0;
-         len -= TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
-        p = page_find(addr >> TARGET_PAGE_BITS);
-        if (!p) {
-            return -1;
-        }
-        if (!(p->flags & PAGE_VALID)) {
-            return -1;
-        }
-
-        if ((flags & PAGE_READ) && !(p->flags & PAGE_READ)) {
-            return -1;
-        }
-        if (flags & PAGE_WRITE) {
-            if (!(p->flags & PAGE_WRITE_ORG)) {
-                return -1;
-            }
-            /* unprotect the page if it was put read-only because it
-               contains translated code */
-            if (!(p->flags & PAGE_WRITE)) {
-                if (!page_unprotect(addr, 0)) {
-                    return -1;
-                }
-            }
-        }
-    }
-    return 0;
-}
-
-/* called from signal handler: invalidate the code and unprotect the
- * page. Return 0 if the fault was not handled, 1 if it was handled,
- * and 2 if it was handled but the caller must cause the TB to be
- * immediately exited. (We can only return 2 if the 'pc' argument is
- * non-zero.)
- */
-int page_unprotect(target_ulong address, uintptr_t pc)
-{
-    unsigned int prot;
-    bool current_tb_invalidated;
-    PageDesc *p;
-    target_ulong host_start, host_end, addr;
-
-    /* Technically this isn't safe inside a signal handler.  However we
-       know this only ever happens in a synchronous SEGV handler, so in
-       practice it seems to be ok.  */
-    mmap_lock();
-
-    p = page_find(address >> TARGET_PAGE_BITS);
-    if (!p) {
-        mmap_unlock();
-        return 0;
-    }
-
-    /* if the page was really writable, then we change its
-       protection back to writable */
-    if ((p->flags & PAGE_WRITE_ORG) && !(p->flags & PAGE_WRITE)) {
-        host_start = address & qemu_host_page_mask;
-        host_end = host_start + qemu_host_page_size;
-
-        prot = 0;
-        current_tb_invalidated = false;
-        for (addr = host_start ; addr < host_end ; addr += TARGET_PAGE_SIZE) {
-            p = page_find(addr >> TARGET_PAGE_BITS);
-            p->flags |= PAGE_WRITE;
-            prot |= p->flags;
-
-            /* and since the content will be modified, we must invalidate
-               the corresponding translated code. */
-            current_tb_invalidated |= tb_invalidate_phys_page(addr, pc);
-#ifdef DEBUG_TB_CHECK
-            tb_invalidate_check(addr);
-#endif
-        }
-        mprotect((void *)g2h(host_start), qemu_host_page_size,
-                 prot & PAGE_BITS);
-
-        mmap_unlock();
-        /* If current TB was invalidated return to main loop */
-        return current_tb_invalidated ? 2 : 1;
-    }
-    mmap_unlock();
-    return 0;
-}
-#endif /* CONFIG_USER_ONLY */