exec.c
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/*
* virtual page mapping
*
* 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 "cpu-i386.h"
/* XXX: pack the flags in the low bits of the pointer ? */
typedef struct PageDesc {
struct TranslationBlock *first_tb;
unsigned long flags;
} 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)
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 long address)
{
unsigned int index;
PageDesc **lp, *p;
index = address >> TARGET_PAGE_BITS;
lp = &l1_map[index >> L2_BITS];
p = *lp;
if (!p) {
/* allocate if not found */
p = malloc(sizeof(PageDesc) * L2_SIZE);
memset(p, 0, sizeof(sizeof(PageDesc) * L2_SIZE));
*lp = p;
}
return p + (index & (L2_SIZE - 1));
}
int page_get_flags(unsigned long address)
{
unsigned int index;
PageDesc *p;
index = address >> TARGET_PAGE_BITS;
p = l1_map[index >> L2_BITS];
if (!p)
return 0;
return p[index & (L2_SIZE - 1)].flags;
}
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);
for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
p = page_find_alloc(addr);
p->flags = flags;
}
}