[mirror_qemu.git] / bsd-user / mmap.c

/*
 *  mmap support for qemu
 *
 *  Copyright (c) 2003 - 2008 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/mman.h>

#include "qemu.h"
#include "qemu-common.h"
#include "bsd-mman.h"

//#define DEBUG_MMAP

#if defined(CONFIG_USE_NPTL)
pthread_mutex_t mmap_mutex;
static int __thread mmap_lock_count;

void mmap_lock(void)
{
    if (mmap_lock_count++ == 0) {
        pthread_mutex_lock(&mmap_mutex);
    }
}

void mmap_unlock(void)
{
    if (--mmap_lock_count == 0) {
        pthread_mutex_unlock(&mmap_mutex);
    }
}

/* Grab lock to make sure things are in a consistent state after fork().  */
void mmap_fork_start(void)
{
    if (mmap_lock_count)
        abort();
    pthread_mutex_lock(&mmap_mutex);
}

void mmap_fork_end(int child)
{
    if (child)
        pthread_mutex_init(&mmap_mutex, NULL);
    else
        pthread_mutex_unlock(&mmap_mutex);
}
#else
/* We aren't threadsafe to start with, so no need to worry about locking.  */
void mmap_lock(void)
{
}

void mmap_unlock(void)
{
}
#endif

/* NOTE: all the constants are the HOST ones, but addresses are target. */
int target_mprotect(abi_ulong start, abi_ulong len, int prot)
{
    abi_ulong end, host_start, host_end, addr;
    int prot1, ret;

#ifdef DEBUG_MMAP
    printf("mprotect: start=0x" TARGET_FMT_lx
           " len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len,
           prot & PROT_READ ? 'r' : '-',
           prot & PROT_WRITE ? 'w' : '-',
           prot & PROT_EXEC ? 'x' : '-');
#endif

    if ((start & ~TARGET_PAGE_MASK) != 0)
        return -EINVAL;
    len = TARGET_PAGE_ALIGN(len);
    end = start + len;
    if (end < start)
        return -EINVAL;
    prot &= PROT_READ | PROT_WRITE | PROT_EXEC;
    if (len == 0)
        return 0;

    mmap_lock();
    host_start = start & qemu_host_page_mask;
    host_end = HOST_PAGE_ALIGN(end);
    if (start > host_start) {
        /* handle host page containing start */
        prot1 = prot;
        for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
            prot1 |= page_get_flags(addr);
        }
        if (host_end == host_start + qemu_host_page_size) {
            for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
                prot1 |= page_get_flags(addr);
            }
            end = host_end;
        }
        ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS);
        if (ret != 0)
            goto error;
        host_start += qemu_host_page_size;
    }
    if (end < host_end) {
        prot1 = prot;
        for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
            prot1 |= page_get_flags(addr);
        }
        ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size,
                       prot1 & PAGE_BITS);
        if (ret != 0)
            goto error;
        host_end -= qemu_host_page_size;
    }

    /* handle the pages in the middle */
    if (host_start < host_end) {
        ret = mprotect(g2h(host_start), host_end - host_start, prot);
        if (ret != 0)
            goto error;
    }
    page_set_flags(start, start + len, prot | PAGE_VALID);
    mmap_unlock();
    return 0;
error:
    mmap_unlock();
    return ret;
}

/* map an incomplete host page */
static int mmap_frag(abi_ulong real_start,
                     abi_ulong start, abi_ulong end,
                     int prot, int flags, int fd, abi_ulong offset)
{
    abi_ulong real_end, addr;
    void *host_start;
    int prot1, prot_new;

    real_end = real_start + qemu_host_page_size;
    host_start = g2h(real_start);

    /* get the protection of the target pages outside the mapping */
    prot1 = 0;
    for(addr = real_start; addr < real_end; addr++) {
        if (addr < start || addr >= end)
            prot1 |= page_get_flags(addr);
    }

    if (prot1 == 0) {
        /* no page was there, so we allocate one */
        void *p = mmap(host_start, qemu_host_page_size, prot,
                       flags | MAP_ANON, -1, 0);
        if (p == MAP_FAILED)
            return -1;
        prot1 = prot;
    }
    prot1 &= PAGE_BITS;

    prot_new = prot | prot1;
    if (!(flags & MAP_ANON)) {
        /* msync() won't work here, so we return an error if write is
           possible while it is a shared mapping */
        if ((flags & TARGET_BSD_MAP_FLAGMASK) == MAP_SHARED &&
            (prot & PROT_WRITE))
            return -1;

        /* adjust protection to be able to read */
        if (!(prot1 & PROT_WRITE))
            mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);

        /* read the corresponding file data */
        pread(fd, g2h(start), end - start, offset);

        /* put final protection */
        if (prot_new != (prot1 | PROT_WRITE))
            mprotect(host_start, qemu_host_page_size, prot_new);
    } else {
        /* just update the protection */
        if (prot_new != prot1) {
            mprotect(host_start, qemu_host_page_size, prot_new);
        }
    }
    return 0;
}

#if defined(__CYGWIN__)
/* Cygwin doesn't have a whole lot of address space.  */
static abi_ulong mmap_next_start = 0x18000000;
#else
static abi_ulong mmap_next_start = 0x40000000;
#endif

unsigned long last_brk;

/* find a free memory area of size 'size'. The search starts at
   'start'. If 'start' == 0, then a default start address is used.
   Return -1 if error.
*/
/* page_init() marks pages used by the host as reserved to be sure not
   to use them. */
static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
{
    abi_ulong addr, addr1, addr_start;
    int prot;
    unsigned long new_brk;

    new_brk = (unsigned long)sbrk(0);
    if (last_brk && last_brk < new_brk && last_brk == (target_ulong)last_brk) {
        /* This is a hack to catch the host allocating memory with brk().
           If it uses mmap then we loose.
           FIXME: We really want to avoid the host allocating memory in
           the first place, and maybe leave some slack to avoid switching
           to mmap.  */
        page_set_flags(last_brk & TARGET_PAGE_MASK,
                       TARGET_PAGE_ALIGN(new_brk),
                       PAGE_RESERVED);
    }
    last_brk = new_brk;

    size = HOST_PAGE_ALIGN(size);
    start = start & qemu_host_page_mask;
    addr = start;
    if (addr == 0)
        addr = mmap_next_start;
    addr_start = addr;
    for(;;) {
        prot = 0;
        for(addr1 = addr; addr1 < (addr + size); addr1 += TARGET_PAGE_SIZE) {
            prot |= page_get_flags(addr1);
        }
        if (prot == 0)
            break;
        addr += qemu_host_page_size;
        /* we found nothing */
        if (addr == addr_start)
            return (abi_ulong)-1;
    }
    if (start == 0)
        mmap_next_start = addr + size;
    return addr;
}

/* NOTE: all the constants are the HOST ones */
abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
                     int flags, int fd, abi_ulong offset)
{
    abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
    unsigned long host_start;

    mmap_lock();
#ifdef DEBUG_MMAP
    {
        printf("mmap: start=0x" TARGET_FMT_lx
               " len=0x" TARGET_FMT_lx " prot=%c%c%c flags=",
               start, len,
               prot & PROT_READ ? 'r' : '-',
               prot & PROT_WRITE ? 'w' : '-',
               prot & PROT_EXEC ? 'x' : '-');
        if (flags & MAP_FIXED)
            printf("MAP_FIXED ");
        if (flags & MAP_ANON)
            printf("MAP_ANON ");
        switch(flags & TARGET_BSD_MAP_FLAGMASK) {
        case MAP_PRIVATE:
            printf("MAP_PRIVATE ");
            break;
        case MAP_SHARED:
            printf("MAP_SHARED ");
            break;
        default:
            printf("[MAP_FLAGMASK=0x%x] ", flags & TARGET_BSD_MAP_FLAGMASK);
            break;
        }
        printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset);
    }
#endif

    if (offset & ~TARGET_PAGE_MASK) {
        errno = EINVAL;
        goto fail;
    }

    len = TARGET_PAGE_ALIGN(len);
    if (len == 0)
        goto the_end;
    real_start = start & qemu_host_page_mask;

    if (!(flags & MAP_FIXED)) {
        abi_ulong mmap_start;
        void *p;
        host_offset = offset & qemu_host_page_mask;
        host_len = len + offset - host_offset;
        host_len = HOST_PAGE_ALIGN(host_len);
        mmap_start = mmap_find_vma(real_start, host_len);
        if (mmap_start == (abi_ulong)-1) {
            errno = ENOMEM;
            goto fail;
        }
        /* Note: we prefer to control the mapping address. It is
           especially important if qemu_host_page_size >
           qemu_real_host_page_size */
        p = mmap(g2h(mmap_start),
                 host_len, prot, flags | MAP_FIXED, fd, host_offset);
        if (p == MAP_FAILED)
            goto fail;
        /* update start so that it points to the file position at 'offset' */
        host_start = (unsigned long)p;
        if (!(flags & MAP_ANON))
            host_start += offset - host_offset;
        start = h2g(host_start);
    } else {
        int flg;
        target_ulong addr;

        if (start & ~TARGET_PAGE_MASK) {
            errno = EINVAL;
            goto fail;
        }
        end = start + len;
        real_end = HOST_PAGE_ALIGN(end);

        for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) {
            flg = page_get_flags(addr);
            if (flg & PAGE_RESERVED) {
                errno = ENXIO;
                goto fail;
            }
        }

        /* worst case: we cannot map the file because the offset is not
           aligned, so we read it */
        if (!(flags & MAP_ANON) &&
            (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) {
            /* msync() won't work here, so we return an error if write is
               possible while it is a shared mapping */
            if ((flags & TARGET_BSD_MAP_FLAGMASK) == MAP_SHARED &&
                (prot & PROT_WRITE)) {
                errno = EINVAL;
                goto fail;
            }
            retaddr = target_mmap(start, len, prot | PROT_WRITE,
                                  MAP_FIXED | MAP_PRIVATE | MAP_ANON,
                                  -1, 0);
            if (retaddr == -1)
                goto fail;
            pread(fd, g2h(start), len, offset);
            if (!(prot & PROT_WRITE)) {
                ret = target_mprotect(start, len, prot);
                if (ret != 0) {
                    start = ret;
                    goto the_end;
                }
            }
            goto the_end;
        }

        /* handle the start of the mapping */
        if (start > real_start) {
            if (real_end == real_start + qemu_host_page_size) {
                /* one single host page */
                ret = mmap_frag(real_start, start, end,
                                prot, flags, fd, offset);
                if (ret == -1)
                    goto fail;
                goto the_end1;
            }
            ret = mmap_frag(real_start, start, real_start + qemu_host_page_size,
                            prot, flags, fd, offset);
            if (ret == -1)
                goto fail;
            real_start += qemu_host_page_size;
        }
        /* handle the end of the mapping */
        if (end < real_end) {
            ret = mmap_frag(real_end - qemu_host_page_size,
                            real_end - qemu_host_page_size, real_end,
                            prot, flags, fd,
                            offset + real_end - qemu_host_page_size - start);
            if (ret == -1)
                goto fail;
            real_end -= qemu_host_page_size;
        }

        /* map the middle (easier) */
        if (real_start < real_end) {
            void *p;
            unsigned long offset1;
            if (flags & MAP_ANON)
                offset1 = 0;
            else
                offset1 = offset + real_start - start;
            p = mmap(g2h(real_start), real_end - real_start,
                     prot, flags, fd, offset1);
            if (p == MAP_FAILED)
                goto fail;
        }
    }
 the_end1:
    page_set_flags(start, start + len, prot | PAGE_VALID);
 the_end:
#ifdef DEBUG_MMAP
    printf("ret=0x" TARGET_FMT_lx "\n", start);
    page_dump(stdout);
    printf("\n");
#endif
    mmap_unlock();
    return start;
fail:
    mmap_unlock();
    return -1;
}

int target_munmap(abi_ulong start, abi_ulong len)
{
    abi_ulong end, real_start, real_end, addr;
    int prot, ret;

#ifdef DEBUG_MMAP
    printf("munmap: start=0x%lx len=0x%lx\n", start, len);
#endif
    if (start & ~TARGET_PAGE_MASK)
        return -EINVAL;
    len = TARGET_PAGE_ALIGN(len);
    if (len == 0)
        return -EINVAL;
    mmap_lock();
    end = start + len;
    real_start = start & qemu_host_page_mask;
    real_end = HOST_PAGE_ALIGN(end);

    if (start > real_start) {
        /* handle host page containing start */
        prot = 0;
        for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
            prot |= page_get_flags(addr);
        }
        if (real_end == real_start + qemu_host_page_size) {
            for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
                prot |= page_get_flags(addr);
            }
            end = real_end;
        }
        if (prot != 0)
            real_start += qemu_host_page_size;
    }
    if (end < real_end) {
        prot = 0;
        for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
            prot |= page_get_flags(addr);
        }
        if (prot != 0)
            real_end -= qemu_host_page_size;
    }

    ret = 0;
    /* unmap what we can */
    if (real_start < real_end) {
        ret = munmap(g2h(real_start), real_end - real_start);
    }

    if (ret == 0)
        page_set_flags(start, start + len, 0);
    mmap_unlock();
    return ret;
}

int target_msync(abi_ulong start, abi_ulong len, int flags)
{
    abi_ulong end;

    if (start & ~TARGET_PAGE_MASK)
        return -EINVAL;
    len = TARGET_PAGE_ALIGN(len);
    end = start + len;
    if (end < start)
        return -EINVAL;
    if (end == start)
        return 0;

    start &= qemu_host_page_mask;
    return msync(g2h(start), end - start, flags);
}
Commit	Line	Data
84778508 BS	1	/*
	2	* mmap support for qemu
	3	*
	4	* Copyright (c) 2003 - 2008 Fabrice Bellard
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program 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
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
8167ee88	17	* along with this program; if not, see <http://www.gnu.org/licenses/>.
84778508 BS	18	*/
	19	#include <stdlib.h>
	20	#include <stdio.h>
	21	#include <stdarg.h>
	22	#include <string.h>
	23	#include <unistd.h>
	24	#include <errno.h>
	25	#include <sys/mman.h>
	26
	27	#include "qemu.h"
	28	#include "qemu-common.h"
6c173b3c	29	#include "bsd-mman.h"
84778508 BS	30
	31	//#define DEBUG_MMAP
	32
2f7bb878	33	#if defined(CONFIG_USE_NPTL)
84778508 BS	34	pthread_mutex_t mmap_mutex;
	35	static int __thread mmap_lock_count;
	36
	37	void mmap_lock(void)
	38	{
	39	if (mmap_lock_count++ == 0) {
	40	pthread_mutex_lock(&mmap_mutex);
	41	}
	42	}
	43
	44	void mmap_unlock(void)
	45	{
	46	if (--mmap_lock_count == 0) {
	47	pthread_mutex_unlock(&mmap_mutex);
	48	}
	49	}
	50
	51	/* Grab lock to make sure things are in a consistent state after fork(). */
	52	void mmap_fork_start(void)
	53	{
	54	if (mmap_lock_count)
	55	abort();
	56	pthread_mutex_lock(&mmap_mutex);
	57	}
	58
	59	void mmap_fork_end(int child)
	60	{
	61	if (child)
	62	pthread_mutex_init(&mmap_mutex, NULL);
	63	else
	64	pthread_mutex_unlock(&mmap_mutex);
	65	}
	66	#else
	67	/* We aren't threadsafe to start with, so no need to worry about locking. */
	68	void mmap_lock(void)
	69	{
	70	}
	71
	72	void mmap_unlock(void)
	73	{
	74	}
	75	#endif
	76
84778508 BS	77	/* NOTE: all the constants are the HOST ones, but addresses are target. */
	78	int target_mprotect(abi_ulong start, abi_ulong len, int prot)
	79	{
	80	abi_ulong end, host_start, host_end, addr;
	81	int prot1, ret;
	82
	83	#ifdef DEBUG_MMAP
	84	printf("mprotect: start=0x" TARGET_FMT_lx
	85	" len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len,
	86	prot & PROT_READ ? 'r' : '-',
	87	prot & PROT_WRITE ? 'w' : '-',
	88	prot & PROT_EXEC ? 'x' : '-');
	89	#endif
	90
	91	if ((start & ~TARGET_PAGE_MASK) != 0)
	92	return -EINVAL;
	93	len = TARGET_PAGE_ALIGN(len);
	94	end = start + len;
	95	if (end < start)
	96	return -EINVAL;
	97	prot &= PROT_READ \| PROT_WRITE \| PROT_EXEC;
	98	if (len == 0)
	99	return 0;
	100
	101	mmap_lock();
	102	host_start = start & qemu_host_page_mask;
	103	host_end = HOST_PAGE_ALIGN(end);
	104	if (start > host_start) {
	105	/* handle host page containing start */
	106	prot1 = prot;
	107	for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
	108	prot1 \|= page_get_flags(addr);
	109	}
	110	if (host_end == host_start + qemu_host_page_size) {
	111	for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
	112	prot1 \|= page_get_flags(addr);
	113	}
	114	end = host_end;
	115	}
	116	ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS);
	117	if (ret != 0)
	118	goto error;
	119	host_start += qemu_host_page_size;
	120	}
	121	if (end < host_end) {
	122	prot1 = prot;
	123	for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
	124	prot1 \|= page_get_flags(addr);
	125	}
	126	ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size,
	127	prot1 & PAGE_BITS);
	128	if (ret != 0)
	129	goto error;
	130	host_end -= qemu_host_page_size;
	131	}
	132
	133	/* handle the pages in the middle */
	134	if (host_start < host_end) {
	135	ret = mprotect(g2h(host_start), host_end - host_start, prot);
	136	if (ret != 0)
	137	goto error;
	138	}
	139	page_set_flags(start, start + len, prot \| PAGE_VALID);
	140	mmap_unlock();
141	return 0;
142	error:
143	mmap_unlock();
144	return ret;
145	}
146
147	/* map an incomplete host page */
148	static int mmap_frag(abi_ulong real_start,
149	abi_ulong start, abi_ulong end,
150	int prot, int flags, int fd, abi_ulong offset)
151	{
152	abi_ulong real_end, addr;
153	void *host_start;
154	int prot1, prot_new;
155
156	real_end = real_start + qemu_host_page_size;
157	host_start = g2h(real_start);
158
159	/* get the protection of the target pages outside the mapping */
160	prot1 = 0;
161	for(addr = real_start; addr < real_end; addr++) {
162	if (addr < start \|\| addr >= end)
163	prot1 \|= page_get_flags(addr);
164	}
165
166	if (prot1 == 0) {
167	/* no page was there, so we allocate one */
168	void *p = mmap(host_start, qemu_host_page_size, prot,
169	flags \| MAP_ANON, -1, 0);
170	if (p == MAP_FAILED)
171	return -1;
172	prot1 = prot;
173	}
174	prot1 &= PAGE_BITS;
175
176	prot_new = prot \| prot1;
177	if (!(flags & MAP_ANON)) {
178	/* msync() won't work here, so we return an error if write is
179	possible while it is a shared mapping */
6c173b3c	180	if ((flags & TARGET_BSD_MAP_FLAGMASK) == MAP_SHARED &&
84778508	181	(prot & PROT_WRITE))
059bca46	182	return -1;
84778508 BS	183
	184	/* adjust protection to be able to read */
	185	if (!(prot1 & PROT_WRITE))
	186	mprotect(host_start, qemu_host_page_size, prot1 \| PROT_WRITE);
	187
	188	/* read the corresponding file data */
	189	pread(fd, g2h(start), end - start, offset);
	190
	191	/* put final protection */
	192	if (prot_new != (prot1 \| PROT_WRITE))
	193	mprotect(host_start, qemu_host_page_size, prot_new);
	194	} else {
	195	/* just update the protection */
	196	if (prot_new != prot1) {
	197	mprotect(host_start, qemu_host_page_size, prot_new);
	198	}
	199	}
	200	return 0;
	201	}
	202
	203	#if defined(__CYGWIN__)
	204	/* Cygwin doesn't have a whole lot of address space. */
	205	static abi_ulong mmap_next_start = 0x18000000;
	206	#else
	207	static abi_ulong mmap_next_start = 0x40000000;
	208	#endif
	209
	210	unsigned long last_brk;
	211
	212	/* find a free memory area of size 'size'. The search starts at
	213	'start'. If 'start' == 0, then a default start address is used.
	214	Return -1 if error.
	215	*/
	216	/* page_init() marks pages used by the host as reserved to be sure not
	217	to use them. */
	218	static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
	219	{
	220	abi_ulong addr, addr1, addr_start;
	221	int prot;
	222	unsigned long new_brk;
	223
	224	new_brk = (unsigned long)sbrk(0);
	225	if (last_brk && last_brk < new_brk && last_brk == (target_ulong)last_brk) {
	226	/* This is a hack to catch the host allocating memory with brk().
	227	If it uses mmap then we loose.
	228	FIXME: We really want to avoid the host allocating memory in
	229	the first place, and maybe leave some slack to avoid switching
	230	to mmap. */
	231	page_set_flags(last_brk & TARGET_PAGE_MASK,
	232	TARGET_PAGE_ALIGN(new_brk),
	233	PAGE_RESERVED);
	234	}
	235	last_brk = new_brk;
	236
	237	size = HOST_PAGE_ALIGN(size);
	238	start = start & qemu_host_page_mask;
	239	addr = start;
	240	if (addr == 0)
	241	addr = mmap_next_start;
	242	addr_start = addr;
	243	for(;;) {
	244	prot = 0;
	245	for(addr1 = addr; addr1 < (addr + size); addr1 += TARGET_PAGE_SIZE) {
	246	prot \|= page_get_flags(addr1);
247	}
248	if (prot == 0)
249	break;
250	addr += qemu_host_page_size;
251	/* we found nothing */
252	if (addr == addr_start)
253	return (abi_ulong)-1;
254	}
255	if (start == 0)
256	mmap_next_start = addr + size;
257	return addr;
258	}
259
260	/* NOTE: all the constants are the HOST ones */
261	abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
262	int flags, int fd, abi_ulong offset)
263	{
264	abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
265	unsigned long host_start;
266
267	mmap_lock();
268	#ifdef DEBUG_MMAP
269	{
270	printf("mmap: start=0x" TARGET_FMT_lx
271	" len=0x" TARGET_FMT_lx " prot=%c%c%c flags=",
272	start, len,
273	prot & PROT_READ ? 'r' : '-',
274	prot & PROT_WRITE ? 'w' : '-',
275	prot & PROT_EXEC ? 'x' : '-');
276	if (flags & MAP_FIXED)
277	printf("MAP_FIXED ");
278	if (flags & MAP_ANON)
279	printf("MAP_ANON ");
6c173b3c	280	switch(flags & TARGET_BSD_MAP_FLAGMASK) {
84778508 BS	281	case MAP_PRIVATE:
	282	printf("MAP_PRIVATE ");
	283	break;
	284	case MAP_SHARED:
	285	printf("MAP_SHARED ");
	286	break;
	287	default:
6c173b3c	288	printf("[MAP_FLAGMASK=0x%x] ", flags & TARGET_BSD_MAP_FLAGMASK);
84778508 BS	289	break;
	290	}
	291	printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset);
	292	}
	293	#endif
	294
	295	if (offset & ~TARGET_PAGE_MASK) {
	296	errno = EINVAL;
	297	goto fail;
	298	}
	299
	300	len = TARGET_PAGE_ALIGN(len);
	301	if (len == 0)
	302	goto the_end;
	303	real_start = start & qemu_host_page_mask;
	304
	305	if (!(flags & MAP_FIXED)) {
	306	abi_ulong mmap_start;
	307	void *p;
	308	host_offset = offset & qemu_host_page_mask;
	309	host_len = len + offset - host_offset;
	310	host_len = HOST_PAGE_ALIGN(host_len);
	311	mmap_start = mmap_find_vma(real_start, host_len);
	312	if (mmap_start == (abi_ulong)-1) {
	313	errno = ENOMEM;
	314	goto fail;
	315	}
	316	/* Note: we prefer to control the mapping address. It is
	317	especially important if qemu_host_page_size >
	318	qemu_real_host_page_size */
	319	p = mmap(g2h(mmap_start),
	320	host_len, prot, flags \| MAP_FIXED, fd, host_offset);
	321	if (p == MAP_FAILED)
	322	goto fail;
	323	/* update start so that it points to the file position at 'offset' */
	324	host_start = (unsigned long)p;
	325	if (!(flags & MAP_ANON))
	326	host_start += offset - host_offset;
	327	start = h2g(host_start);
	328	} else {
	329	int flg;
	330	target_ulong addr;
	331
	332	if (start & ~TARGET_PAGE_MASK) {
	333	errno = EINVAL;
	334	goto fail;
	335	}
	336	end = start + len;
	337	real_end = HOST_PAGE_ALIGN(end);
	338
	339	for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) {
	340	flg = page_get_flags(addr);
	341	if (flg & PAGE_RESERVED) {
	342	errno = ENXIO;
	343	goto fail;
	344	}
	345	}
	346
	347	/* worst case: we cannot map the file because the offset is not
	348	aligned, so we read it */
	349	if (!(flags & MAP_ANON) &&
	350	(offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) {
	351	/* msync() won't work here, so we return an error if write is
	352	possible while it is a shared mapping */
6c173b3c	353	if ((flags & TARGET_BSD_MAP_FLAGMASK) == MAP_SHARED &&
84778508 BS	354	(prot & PROT_WRITE)) {
	355	errno = EINVAL;
	356	goto fail;
	357	}
	358	retaddr = target_mmap(start, len, prot \| PROT_WRITE,
	359	MAP_FIXED \| MAP_PRIVATE \| MAP_ANON,
	360	-1, 0);
	361	if (retaddr == -1)
	362	goto fail;
	363	pread(fd, g2h(start), len, offset);
	364	if (!(prot & PROT_WRITE)) {
	365	ret = target_mprotect(start, len, prot);
	366	if (ret != 0) {
	367	start = ret;
	368	goto the_end;
	369	}
	370	}
	371	goto the_end;
	372	}
	373
	374	/* handle the start of the mapping */
	375	if (start > real_start) {
	376	if (real_end == real_start + qemu_host_page_size) {
	377	/* one single host page */
	378	ret = mmap_frag(real_start, start, end,
	379	prot, flags, fd, offset);
	380	if (ret == -1)
	381	goto fail;
	382	goto the_end1;
	383	}
	384	ret = mmap_frag(real_start, start, real_start + qemu_host_page_size,
	385	prot, flags, fd, offset);
	386	if (ret == -1)
	387	goto fail;
	388	real_start += qemu_host_page_size;
	389	}
	390	/* handle the end of the mapping */
	391	if (end < real_end) {
	392	ret = mmap_frag(real_end - qemu_host_page_size,
	393	real_end - qemu_host_page_size, real_end,
	394	prot, flags, fd,
	395	offset + real_end - qemu_host_page_size - start);
	396	if (ret == -1)
	397	goto fail;
	398	real_end -= qemu_host_page_size;
	399	}
	400
	401	/* map the middle (easier) */
	402	if (real_start < real_end) {
	403	void *p;
	404	unsigned long offset1;
	405	if (flags & MAP_ANON)
	406	offset1 = 0;
	407	else
	408	offset1 = offset + real_start - start;
	409	p = mmap(g2h(real_start), real_end - real_start,
	410	prot, flags, fd, offset1);
	411	if (p == MAP_FAILED)
	412	goto fail;
	413	}
	414	}
	415	the_end1:
	416	page_set_flags(start, start + len, prot \| PAGE_VALID);
	417	the_end:
418	#ifdef DEBUG_MMAP
419	printf("ret=0x" TARGET_FMT_lx "\n", start);
420	page_dump(stdout);
421	printf("\n");
422	#endif
423	mmap_unlock();
424	return start;
425	fail:
426	mmap_unlock();
427	return -1;
428	}
429
430	int target_munmap(abi_ulong start, abi_ulong len)
431	{
432	abi_ulong end, real_start, real_end, addr;
433	int prot, ret;
434
435	#ifdef DEBUG_MMAP
436	printf("munmap: start=0x%lx len=0x%lx\n", start, len);
437	#endif
438	if (start & ~TARGET_PAGE_MASK)
439	return -EINVAL;
440	len = TARGET_PAGE_ALIGN(len);
441	if (len == 0)
442	return -EINVAL;
443	mmap_lock();
444	end = start + len;
445	real_start = start & qemu_host_page_mask;
446	real_end = HOST_PAGE_ALIGN(end);
447
448	if (start > real_start) {
449	/* handle host page containing start */
450	prot = 0;
451	for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
452	prot \|= page_get_flags(addr);
453	}
454	if (real_end == real_start + qemu_host_page_size) {
455	for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
456	prot \|= page_get_flags(addr);
457	}
458	end = real_end;
459	}
460	if (prot != 0)
461	real_start += qemu_host_page_size;
462	}
463	if (end < real_end) {
464	prot = 0;
465	for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
466	prot \|= page_get_flags(addr);
467	}
468	if (prot != 0)
469	real_end -= qemu_host_page_size;
470	}
471
472	ret = 0;
473	/* unmap what we can */
474	if (real_start < real_end) {
475	ret = munmap(g2h(real_start), real_end - real_start);
476	}
477
478	if (ret == 0)
479	page_set_flags(start, start + len, 0);
480	mmap_unlock();
481	return ret;
482	}
483
484	int target_msync(abi_ulong start, abi_ulong len, int flags)
485	{
486	abi_ulong end;
487
488	if (start & ~TARGET_PAGE_MASK)
489	return -EINVAL;
490	len = TARGET_PAGE_ALIGN(len);
491	end = start + len;
492	if (end < start)
493	return -EINVAL;
494	if (end == start)
495	return 0;
496
497	start &= qemu_host_page_mask;
498	return msync(g2h(start), end - start, flags);
499	}