[mirror_qemu.git] / exec.c

/*
 *  virtual page mapping and translated block handling
 * 
 *  Copyright (c) 2003 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/mman.h>

#include "cpu-i386.h"

//#define DEBUG_TB_INVALIDATE
#define DEBUG_FLUSH

/* make various TB consistency checks */
//#define DEBUG_TB_CHECK 

/* threshold to flush the translated code buffer */
#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - CODE_GEN_MAX_SIZE)

#define CODE_GEN_MAX_BLOCKS    (CODE_GEN_BUFFER_SIZE / 64)

TranslationBlock tbs[CODE_GEN_MAX_BLOCKS];
TranslationBlock *tb_hash[CODE_GEN_HASH_SIZE];
int nb_tbs;
/* any access to the tbs or the page table must use this lock */
spinlock_t tb_lock = SPIN_LOCK_UNLOCKED;

uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE];
uint8_t *code_gen_ptr;

/* XXX: pack the flags in the low bits of the pointer ? */
typedef struct PageDesc {
    unsigned long flags;
    TranslationBlock *first_tb;
} PageDesc;

#define L2_BITS 10
#define L1_BITS (32 - L2_BITS - TARGET_PAGE_BITS)

#define L1_SIZE (1 << L1_BITS)
#define L2_SIZE (1 << L2_BITS)

static void tb_invalidate_page(unsigned long address);

unsigned long real_host_page_size;
unsigned long host_page_bits;
unsigned long host_page_size;
unsigned long host_page_mask;

static PageDesc *l1_map[L1_SIZE];

void page_init(void)
{
    /* NOTE: we can always suppose that host_page_size >=
       TARGET_PAGE_SIZE */
    real_host_page_size = getpagesize();
    if (host_page_size == 0)
        host_page_size = real_host_page_size;
    if (host_page_size < TARGET_PAGE_SIZE)
        host_page_size = TARGET_PAGE_SIZE;
    host_page_bits = 0;
    while ((1 << host_page_bits) < host_page_size)
        host_page_bits++;
    host_page_mask = ~(host_page_size - 1);
}

/* dump memory mappings */
void page_dump(FILE *f)
{
    unsigned long start, end;
    int i, j, prot, prot1;
    PageDesc *p;

    fprintf(f, "%-8s %-8s %-8s %s\n",
            "start", "end", "size", "prot");
    start = -1;
    end = -1;
    prot = 0;
    for(i = 0; i <= L1_SIZE; i++) {
        if (i < L1_SIZE)
            p = l1_map[i];
        else
            p = NULL;
        for(j = 0;j < L2_SIZE; j++) {
            if (!p)
                prot1 = 0;
            else
                prot1 = p[j].flags;
            if (prot1 != prot) {
                end = (i << (32 - L1_BITS)) | (j << TARGET_PAGE_BITS);
                if (start != -1) {
                    fprintf(f, "%08lx-%08lx %08lx %c%c%c\n",
                            start, end, end - start, 
                            prot & PAGE_READ ? 'r' : '-',
                            prot & PAGE_WRITE ? 'w' : '-',
                            prot & PAGE_EXEC ? 'x' : '-');
                }
                if (prot1 != 0)
                    start = end;
                else
                    start = -1;
                prot = prot1;
            }
            if (!p)
                break;
        }
    }
}

static inline PageDesc *page_find_alloc(unsigned int index)
{
    PageDesc **lp, *p;

    lp = &l1_map[index >> L2_BITS];
    p = *lp;
    if (!p) {
        /* allocate if not found */
        p = malloc(sizeof(PageDesc) * L2_SIZE);
        memset(p, 0, sizeof(PageDesc) * L2_SIZE);
        *lp = p;
    }
    return p + (index & (L2_SIZE - 1));
}

static inline PageDesc *page_find(unsigned int index)
{
    PageDesc *p;

    p = l1_map[index >> L2_BITS];
    if (!p)
        return 0;
    return p + (index & (L2_SIZE - 1));
}

int page_get_flags(unsigned long 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 positionned automatically
   depending on PAGE_WRITE */
void page_set_flags(unsigned long start, unsigned long end, int flags)
{
    PageDesc *p;
    unsigned long addr;

    start = start & TARGET_PAGE_MASK;
    end = TARGET_PAGE_ALIGN(end);
    if (flags & PAGE_WRITE)
        flags |= PAGE_WRITE_ORG;
    spin_lock(&tb_lock);
    for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
        p = page_find_alloc(addr >> TARGET_PAGE_BITS);
        /* if the write protection is set, then we invalidate the code
           inside */
        if (!(p->flags & PAGE_WRITE) && 
            (flags & PAGE_WRITE) &&
            p->first_tb) {
            tb_invalidate_page(addr);
        }
        p->flags = flags;
    }
    spin_unlock(&tb_lock);
}

void cpu_x86_tblocks_init(void)
{
    if (!code_gen_ptr) {
        code_gen_ptr = code_gen_buffer;
    }
}

/* set to NULL all the 'first_tb' fields in all PageDescs */
static void page_flush_tb(void)
{
    int i, j;
    PageDesc *p;

    for(i = 0; i < L1_SIZE; i++) {
        p = l1_map[i];
        if (p) {
            for(j = 0; j < L2_SIZE; j++)
                p[j].first_tb = NULL;
        }
    }
}

/* flush all the translation blocks */
void tb_flush(void)
{
    int i;
#ifdef DEBUG_FLUSH
    printf("qemu: flush code_size=%d nb_tbs=%d avg_tb_size=%d\n", 
           code_gen_ptr - code_gen_buffer, 
           nb_tbs, 
           (code_gen_ptr - code_gen_buffer) / nb_tbs);
#endif
    nb_tbs = 0;
    for(i = 0;i < CODE_GEN_HASH_SIZE; i++)
        tb_hash[i] = NULL;
    page_flush_tb();
    code_gen_ptr = code_gen_buffer;
    /* XXX: flush processor icache at this point */
}

#ifdef DEBUG_TB_CHECK

static void tb_invalidate_check(unsigned long address)
{
    TranslationBlock *tb;
    int i;
    address &= TARGET_PAGE_MASK;
    for(i = 0;i < CODE_GEN_HASH_SIZE; i++) {
        for(tb = tb_hash[i]; tb != NULL; tb = tb->hash_next) {
            if (!(address + TARGET_PAGE_SIZE <= tb->pc ||
                  address >= tb->pc + tb->size)) {
                printf("ERROR invalidate: address=%08lx PC=%08lx size=%04x\n",
                       address, tb->pc, tb->size);
            }
        }
    }
}

/* verify that all the pages have correct rights for code */
static void tb_page_check(void)
{
    TranslationBlock *tb;
    int i, flags1, flags2;
    
    for(i = 0;i < CODE_GEN_HASH_SIZE; i++) {
        for(tb = tb_hash[i]; tb != NULL; tb = tb->hash_next) {
            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",
                       tb->pc, tb->size, flags1, flags2);
            }
        }
    }
}

#endif

/* invalidate one TB */
static inline void tb_remove(TranslationBlock **ptb, TranslationBlock *tb,
                             int next_offset)
{
    TranslationBlock *tb1;
    for(;;) {
        tb1 = *ptb;
        if (tb1 == tb) {
            *ptb = *(TranslationBlock **)((char *)tb1 + next_offset);
            break;
        }
        ptb = (TranslationBlock **)((char *)tb1 + next_offset);
    }
}

static inline void tb_invalidate(TranslationBlock *tb, int parity)
{
    PageDesc *p;
    unsigned int page_index1, page_index2;
    unsigned int h;

    /* remove the TB from the hash list */
    h = tb_hash_func(tb->pc);
    tb_remove(&tb_hash[h], tb, 
              offsetof(TranslationBlock, hash_next));
    /* remove the TB from the page list */
    page_index1 = tb->pc >> TARGET_PAGE_BITS;
    if ((page_index1 & 1) == parity) {
        p = page_find(page_index1);
        tb_remove(&p->first_tb, tb, 
                  offsetof(TranslationBlock, page_next[page_index1 & 1]));
    }
    page_index2 = (tb->pc + tb->size - 1) >> TARGET_PAGE_BITS;
    if ((page_index2 & 1) == parity) {
        p = page_find(page_index2);
        tb_remove(&p->first_tb, tb, 
                  offsetof(TranslationBlock, page_next[page_index2 & 1]));
    }
}

/* invalidate all TBs which intersect with the target page starting at addr */
static void tb_invalidate_page(unsigned long address)
{
    TranslationBlock *tb_next, *tb;
    unsigned int page_index;
    int parity1, parity2;
    PageDesc *p;
#ifdef DEBUG_TB_INVALIDATE
    printf("tb_invalidate_page: %lx\n", address);
#endif

    page_index = address >> TARGET_PAGE_BITS;
    p = page_find(page_index);
    if (!p)
        return;
    tb = p->first_tb;
    parity1 = page_index & 1;
    parity2 = parity1 ^ 1;
    while (tb != NULL) {
        tb_next = tb->page_next[parity1];
        tb_invalidate(tb, parity2);
        tb = tb_next;
    }
    p->first_tb = NULL;
}

/* add the tb in the target page and protect it if necessary */
static inline void tb_alloc_page(TranslationBlock *tb, unsigned int page_index)
{
    PageDesc *p;
    unsigned long host_start, host_end, addr, page_addr;
    int prot;

    p = page_find_alloc(page_index);
    tb->page_next[page_index & 1] = p->first_tb;
    p->first_tb = tb;
    if (p->flags & PAGE_WRITE) {
        /* force the host page as non writable (writes will have a
           page fault + mprotect overhead) */
        page_addr = (page_index << TARGET_PAGE_BITS);
        host_start = page_addr & host_page_mask;
        host_end = host_start + host_page_size;
        prot = 0;
        for(addr = host_start; addr < host_end; addr += TARGET_PAGE_SIZE)
            prot |= page_get_flags(addr);
        mprotect((void *)host_start, host_page_size, 
                 (prot & PAGE_BITS) & ~PAGE_WRITE);
#ifdef DEBUG_TB_INVALIDATE
        printf("protecting code page: 0x%08lx\n", 
               host_start);
#endif
        p->flags &= ~PAGE_WRITE;
#ifdef DEBUG_TB_CHECK
        tb_page_check();
#endif
    }
}

/* Allocate a new translation block. Flush the translation buffer if
   too many translation blocks or too much generated code. */
TranslationBlock *tb_alloc(unsigned long pc, 
                           unsigned long size)
{
    TranslationBlock *tb;
    unsigned int page_index1, page_index2;

    if (nb_tbs >= CODE_GEN_MAX_BLOCKS || 
        (code_gen_ptr - code_gen_buffer) >= CODE_GEN_BUFFER_MAX_SIZE)
        tb_flush();
    tb = &tbs[nb_tbs++];
    tb->pc = pc;
    tb->size = size;

    /* add in the page list */
    page_index1 = pc >> TARGET_PAGE_BITS;
    tb_alloc_page(tb, page_index1);
    page_index2 = (pc + size - 1) >> TARGET_PAGE_BITS;
    if (page_index2 != page_index1) {
        tb_alloc_page(tb, page_index2);
    }
    return tb;
}

/* called from signal handler: invalidate the code and unprotect the
   page. Return TRUE if the fault was succesfully handled. */
int page_unprotect(unsigned long address)
{
    unsigned int page_index, prot, pindex;
    PageDesc *p, *p1;
    unsigned long host_start, host_end, addr;

    host_start = address & host_page_mask;
    page_index = host_start >> TARGET_PAGE_BITS;
    p1 = page_find(page_index);
    if (!p1)
        return 0;
    host_end = host_start + host_page_size;
    p = p1;
    prot = 0;
    for(addr = host_start;addr < host_end; addr += TARGET_PAGE_SIZE) {
        prot |= p->flags;
        p++;
    }
    /* if the page was really writable, then we change its
       protection back to writable */
    if (prot & PAGE_WRITE_ORG) {
        mprotect((void *)host_start, host_page_size, 
                 (prot & PAGE_BITS) | PAGE_WRITE);
        pindex = (address - host_start) >> TARGET_PAGE_BITS;
        p1[pindex].flags |= PAGE_WRITE;
        /* and since the content will be modified, we must invalidate
           the corresponding translated code. */
        tb_invalidate_page(address);
#ifdef DEBUG_TB_CHECK
        tb_invalidate_check(address);
#endif
        return 1;
    } else {
        return 0;
    }
}

/* call this function when system calls directly modify a memory area */
void page_unprotect_range(uint8_t *data, unsigned long data_size)
{
    unsigned long start, end, addr;

    start = (unsigned long)data;
    end = start + data_size;
    start &= TARGET_PAGE_MASK;
    end = TARGET_PAGE_ALIGN(end);
    for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
        page_unprotect(addr);
    }
}
Commit	Line	Data
54936004	1	/*
fd6ce8f6	2	* virtual page mapping and translated block handling
54936004 FB	3	*
	4	* Copyright (c) 2003 Fabrice Bellard
	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with this library; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20	#include <stdlib.h>
	21	#include <stdio.h>
	22	#include <stdarg.h>
	23	#include <string.h>
	24	#include <errno.h>
	25	#include <unistd.h>
	26	#include <inttypes.h>
fd6ce8f6	27	#include <sys/mman.h>
54936004 FB	28
	29	#include "cpu-i386.h"
	30
fd6ce8f6 FB	31	//#define DEBUG_TB_INVALIDATE
	32	#define DEBUG_FLUSH
	33
	34	/* make various TB consistency checks */
	35	//#define DEBUG_TB_CHECK
	36
	37	/* threshold to flush the translated code buffer */
	38	#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - CODE_GEN_MAX_SIZE)
	39
	40	#define CODE_GEN_MAX_BLOCKS (CODE_GEN_BUFFER_SIZE / 64)
	41
	42	TranslationBlock tbs[CODE_GEN_MAX_BLOCKS];
	43	TranslationBlock *tb_hash[CODE_GEN_HASH_SIZE];
	44	int nb_tbs;
eb51d102 FB	45	/* any access to the tbs or the page table must use this lock */
eb51d102 FB	46	spinlock_t tb_lock = SPIN_LOCK_UNLOCKED;
fd6ce8f6 FB	47
	48	uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE];
	49	uint8_t *code_gen_ptr;
	50
54936004 FB	51	/* XXX: pack the flags in the low bits of the pointer ? */
54936004 FB	52	typedef struct PageDesc {
54936004	53	unsigned long flags;
fd6ce8f6	54	TranslationBlock *first_tb;
54936004 FB	55	} PageDesc;
	56
	57	#define L2_BITS 10
	58	#define L1_BITS (32 - L2_BITS - TARGET_PAGE_BITS)
	59
	60	#define L1_SIZE (1 << L1_BITS)
	61	#define L2_SIZE (1 << L2_BITS)
	62
fd6ce8f6 FB	63	static void tb_invalidate_page(unsigned long address);
fd6ce8f6 FB	64
54936004 FB	65	unsigned long real_host_page_size;
	66	unsigned long host_page_bits;
	67	unsigned long host_page_size;
	68	unsigned long host_page_mask;
	69
	70	static PageDesc *l1_map[L1_SIZE];
	71
	72	void page_init(void)
	73	{
	74	/* NOTE: we can always suppose that host_page_size >=
	75	TARGET_PAGE_SIZE */
	76	real_host_page_size = getpagesize();
	77	if (host_page_size == 0)
	78	host_page_size = real_host_page_size;
	79	if (host_page_size < TARGET_PAGE_SIZE)
	80	host_page_size = TARGET_PAGE_SIZE;
	81	host_page_bits = 0;
	82	while ((1 << host_page_bits) < host_page_size)
	83	host_page_bits++;
	84	host_page_mask = ~(host_page_size - 1);
	85	}
	86
	87	/* dump memory mappings */
	88	void page_dump(FILE *f)
	89	{
	90	unsigned long start, end;
	91	int i, j, prot, prot1;
	92	PageDesc *p;
	93
	94	fprintf(f, "%-8s %-8s %-8s %s\n",
	95	"start", "end", "size", "prot");
	96	start = -1;
	97	end = -1;
	98	prot = 0;
	99	for(i = 0; i <= L1_SIZE; i++) {
	100	if (i < L1_SIZE)
	101	p = l1_map[i];
	102	else
	103	p = NULL;
	104	for(j = 0;j < L2_SIZE; j++) {
	105	if (!p)
	106	prot1 = 0;
	107	else
	108	prot1 = p[j].flags;
	109	if (prot1 != prot) {
	110	end = (i << (32 - L1_BITS)) \| (j << TARGET_PAGE_BITS);
	111	if (start != -1) {
	112	fprintf(f, "%08lx-%08lx %08lx %c%c%c\n",
	113	start, end, end - start,
	114	prot & PAGE_READ ? 'r' : '-',
	115	prot & PAGE_WRITE ? 'w' : '-',
	116	prot & PAGE_EXEC ? 'x' : '-');
	117	}
	118	if (prot1 != 0)
	119	start = end;
	120	else
	121	start = -1;
	122	prot = prot1;
	123	}
	124	if (!p)
	125	break;
	126	}
	127	}
	128	}
129
fd6ce8f6	130	static inline PageDesc *page_find_alloc(unsigned int index)
54936004	131	{
54936004 FB	132	PageDesc *lp, p;
54936004 FB	133
54936004 FB	134	lp = &l1_map[index >> L2_BITS];
	135	p = *lp;
	136	if (!p) {
	137	/* allocate if not found */
	138	p = malloc(sizeof(PageDesc) * L2_SIZE);
fd6ce8f6	139	memset(p, 0, sizeof(PageDesc) * L2_SIZE);
54936004 FB	140	*lp = p;
	141	}
	142	return p + (index & (L2_SIZE - 1));
	143	}
	144
fd6ce8f6	145	static inline PageDesc *page_find(unsigned int index)
54936004	146	{
54936004 FB	147	PageDesc *p;
54936004 FB	148
54936004 FB	149	p = l1_map[index >> L2_BITS];
	150	if (!p)
	151	return 0;
fd6ce8f6 FB	152	return p + (index & (L2_SIZE - 1));
	153	}
	154
	155	int page_get_flags(unsigned long address)
	156	{
	157	PageDesc *p;
	158
	159	p = page_find(address >> TARGET_PAGE_BITS);
	160	if (!p)
	161	return 0;
	162	return p->flags;
54936004 FB	163	}
54936004 FB	164
fd6ce8f6 FB	165	/* modify the flags of a page and invalidate the code if
	166	necessary. The flag PAGE_WRITE_ORG is positionned automatically
	167	depending on PAGE_WRITE */
54936004 FB	168	void page_set_flags(unsigned long start, unsigned long end, int flags)
	169	{
	170	PageDesc *p;
	171	unsigned long addr;
	172
	173	start = start & TARGET_PAGE_MASK;
	174	end = TARGET_PAGE_ALIGN(end);
fd6ce8f6 FB	175	if (flags & PAGE_WRITE)
fd6ce8f6 FB	176	flags \|= PAGE_WRITE_ORG;
eb51d102	177	spin_lock(&tb_lock);
54936004	178	for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
fd6ce8f6 FB	179	p = page_find_alloc(addr >> TARGET_PAGE_BITS);
	180	/* if the write protection is set, then we invalidate the code
	181	inside */
	182	if (!(p->flags & PAGE_WRITE) &&
	183	(flags & PAGE_WRITE) &&
	184	p->first_tb) {
	185	tb_invalidate_page(addr);
	186	}
54936004 FB	187	p->flags = flags;
54936004 FB	188	}
eb51d102	189	spin_unlock(&tb_lock);
54936004	190	}
fd6ce8f6 FB	191
	192	void cpu_x86_tblocks_init(void)
	193	{
	194	if (!code_gen_ptr) {
	195	code_gen_ptr = code_gen_buffer;
	196	}
	197	}
	198
	199	/* set to NULL all the 'first_tb' fields in all PageDescs */
	200	static void page_flush_tb(void)
	201	{
	202	int i, j;
	203	PageDesc *p;
	204
	205	for(i = 0; i < L1_SIZE; i++) {
	206	p = l1_map[i];
	207	if (p) {
	208	for(j = 0; j < L2_SIZE; j++)
	209	p[j].first_tb = NULL;
	210	}
	211	}
	212	}
	213
	214	/* flush all the translation blocks */
	215	void tb_flush(void)
	216	{
	217	int i;
	218	#ifdef DEBUG_FLUSH
	219	printf("qemu: flush code_size=%d nb_tbs=%d avg_tb_size=%d\n",
	220	code_gen_ptr - code_gen_buffer,
	221	nb_tbs,
	222	(code_gen_ptr - code_gen_buffer) / nb_tbs);
	223	#endif
	224	nb_tbs = 0;
	225	for(i = 0;i < CODE_GEN_HASH_SIZE; i++)
	226	tb_hash[i] = NULL;
	227	page_flush_tb();
	228	code_gen_ptr = code_gen_buffer;
	229	/* XXX: flush processor icache at this point */
	230	}
	231
	232	#ifdef DEBUG_TB_CHECK
	233
	234	static void tb_invalidate_check(unsigned long address)
	235	{
	236	TranslationBlock *tb;
	237	int i;
	238	address &= TARGET_PAGE_MASK;
	239	for(i = 0;i < CODE_GEN_HASH_SIZE; i++) {
	240	for(tb = tb_hash[i]; tb != NULL; tb = tb->hash_next) {
	241	if (!(address + TARGET_PAGE_SIZE <= tb->pc \|\|
	242	address >= tb->pc + tb->size)) {
	243	printf("ERROR invalidate: address=%08lx PC=%08lx size=%04x\n",
	244	address, tb->pc, tb->size);
	245	}
	246	}
	247	}
	248	}
	249
	250	/* verify that all the pages have correct rights for code */
	251	static void tb_page_check(void)
	252	{
	253	TranslationBlock *tb;
	254	int i, flags1, flags2;
255
256	for(i = 0;i < CODE_GEN_HASH_SIZE; i++) {
257	for(tb = tb_hash[i]; tb != NULL; tb = tb->hash_next) {
258	flags1 = page_get_flags(tb->pc);
259	flags2 = page_get_flags(tb->pc + tb->size - 1);
260	if ((flags1 & PAGE_WRITE) \|\| (flags2 & PAGE_WRITE)) {
261	printf("ERROR page flags: PC=%08lx size=%04x f1=%x f2=%x\n",
262	tb->pc, tb->size, flags1, flags2);
263	}
264	}
265	}
266	}
267
268	#endif
269
270	/* invalidate one TB */
271	static inline void tb_remove(TranslationBlock *ptb, TranslationBlock tb,
272	int next_offset)
273	{
274	TranslationBlock *tb1;
275	for(;;) {
276	tb1 = *ptb;
277	if (tb1 == tb) {
278	ptb = (TranslationBlock *)((char )tb1 + next_offset);
279	break;
280	}
281	ptb = (TranslationBlock *)((char )tb1 + next_offset);
282	}
283	}
284
285	static inline void tb_invalidate(TranslationBlock *tb, int parity)
286	{
287	PageDesc *p;
288	unsigned int page_index1, page_index2;
289	unsigned int h;
290
291	/* remove the TB from the hash list */
292	h = tb_hash_func(tb->pc);
293	tb_remove(&tb_hash[h], tb,
294	offsetof(TranslationBlock, hash_next));
295	/* remove the TB from the page list */
296	page_index1 = tb->pc >> TARGET_PAGE_BITS;
297	if ((page_index1 & 1) == parity) {
298	p = page_find(page_index1);
299	tb_remove(&p->first_tb, tb,
300	offsetof(TranslationBlock, page_next[page_index1 & 1]));
301	}
302	page_index2 = (tb->pc + tb->size - 1) >> TARGET_PAGE_BITS;
303	if ((page_index2 & 1) == parity) {
304	p = page_find(page_index2);
305	tb_remove(&p->first_tb, tb,
306	offsetof(TranslationBlock, page_next[page_index2 & 1]));
307	}
308	}
309
310	/* invalidate all TBs which intersect with the target page starting at addr */
311	static void tb_invalidate_page(unsigned long address)
312	{
313	TranslationBlock tb_next, tb;
314	unsigned int page_index;
315	int parity1, parity2;
316	PageDesc *p;
317	#ifdef DEBUG_TB_INVALIDATE
318	printf("tb_invalidate_page: %lx\n", address);
319	#endif
320
321	page_index = address >> TARGET_PAGE_BITS;
322	p = page_find(page_index);
323	if (!p)
324	return;
325	tb = p->first_tb;
326	parity1 = page_index & 1;
327	parity2 = parity1 ^ 1;
328	while (tb != NULL) {
329	tb_next = tb->page_next[parity1];
330	tb_invalidate(tb, parity2);
331	tb = tb_next;
332	}
333	p->first_tb = NULL;
334	}
335
336	/* add the tb in the target page and protect it if necessary */
337	static inline void tb_alloc_page(TranslationBlock *tb, unsigned int page_index)
338	{
339	PageDesc *p;
340	unsigned long host_start, host_end, addr, page_addr;
341	int prot;
342
343	p = page_find_alloc(page_index);
344	tb->page_next[page_index & 1] = p->first_tb;
345	p->first_tb = tb;
346	if (p->flags & PAGE_WRITE) {
347	/* force the host page as non writable (writes will have a
348	page fault + mprotect overhead) */
349	page_addr = (page_index << TARGET_PAGE_BITS);
350	host_start = page_addr & host_page_mask;
351	host_end = host_start + host_page_size;
352	prot = 0;
353	for(addr = host_start; addr < host_end; addr += TARGET_PAGE_SIZE)
354	prot \|= page_get_flags(addr);
355	mprotect((void *)host_start, host_page_size,
356	(prot & PAGE_BITS) & ~PAGE_WRITE);
357	#ifdef DEBUG_TB_INVALIDATE
358	printf("protecting code page: 0x%08lx\n",
359	host_start);
360	#endif
361	p->flags &= ~PAGE_WRITE;
362	#ifdef DEBUG_TB_CHECK
363	tb_page_check();
364	#endif
365	}
366	}
367
368	/* Allocate a new translation block. Flush the translation buffer if
369	too many translation blocks or too much generated code. */
370	TranslationBlock *tb_alloc(unsigned long pc,
371	unsigned long size)
372	{
373	TranslationBlock *tb;
374	unsigned int page_index1, page_index2;
375
376	if (nb_tbs >= CODE_GEN_MAX_BLOCKS \|\|
377	(code_gen_ptr - code_gen_buffer) >= CODE_GEN_BUFFER_MAX_SIZE)
378	tb_flush();
379	tb = &tbs[nb_tbs++];
380	tb->pc = pc;
381	tb->size = size;
382
383	/* add in the page list */
384	page_index1 = pc >> TARGET_PAGE_BITS;
385	tb_alloc_page(tb, page_index1);
386	page_index2 = (pc + size - 1) >> TARGET_PAGE_BITS;
387	if (page_index2 != page_index1) {
388	tb_alloc_page(tb, page_index2);
389	}
390	return tb;
391	}
392
393	/* called from signal handler: invalidate the code and unprotect the
394	page. Return TRUE if the fault was succesfully handled. */
395	int page_unprotect(unsigned long address)
396	{
1565b7bc FB	397	unsigned int page_index, prot, pindex;
1565b7bc FB	398	PageDesc p, p1;
fd6ce8f6 FB	399	unsigned long host_start, host_end, addr;
fd6ce8f6 FB	400
1565b7bc FB	401	host_start = address & host_page_mask;
	402	page_index = host_start >> TARGET_PAGE_BITS;
	403	p1 = page_find(page_index);
	404	if (!p1)
fd6ce8f6	405	return 0;
1565b7bc FB	406	host_end = host_start + host_page_size;
	407	p = p1;
	408	prot = 0;
	409	for(addr = host_start;addr < host_end; addr += TARGET_PAGE_SIZE) {
	410	prot \|= p->flags;
	411	p++;
	412	}
	413	/* if the page was really writable, then we change its
	414	protection back to writable */
	415	if (prot & PAGE_WRITE_ORG) {
fd6ce8f6 FB	416	mprotect((void *)host_start, host_page_size,
fd6ce8f6 FB	417	(prot & PAGE_BITS) \| PAGE_WRITE);
1565b7bc FB	418	pindex = (address - host_start) >> TARGET_PAGE_BITS;
1565b7bc FB	419	p1[pindex].flags \|= PAGE_WRITE;
fd6ce8f6 FB	420	/* and since the content will be modified, we must invalidate
	421	the corresponding translated code. */
	422	tb_invalidate_page(address);
	423	#ifdef DEBUG_TB_CHECK
	424	tb_invalidate_check(address);
	425	#endif
	426	return 1;
	427	} else {
	428	return 0;
	429	}
	430	}
	431
	432	/* call this function when system calls directly modify a memory area */
	433	void page_unprotect_range(uint8_t *data, unsigned long data_size)
	434	{
	435	unsigned long start, end, addr;
	436
	437	start = (unsigned long)data;
	438	end = start + data_size;
	439	start &= TARGET_PAGE_MASK;
	440	end = TARGET_PAGE_ALIGN(end);
	441	for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
	442	page_unprotect(addr);
	443	}
	444	}