/*
* mmap support for qemu
- *
+ *
* Copyright (c) 2003 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
//#define DEBUG_MMAP
-/* NOTE: all the constants are the HOST ones */
-int target_mprotect(unsigned long start, unsigned long len, int prot)
+/* NOTE: all the constants are the HOST ones, but addresses are target. */
+int target_mprotect(abi_ulong start, abi_ulong len, int prot)
{
- unsigned long end, host_start, host_end, addr;
+ abi_ulong end, host_start, host_end, addr;
int prot1, ret;
#ifdef DEBUG_MMAP
- printf("mprotect: start=0x%lx len=0x%lx prot=%c%c%c\n", start, len,
+ 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' : '-');
return -EINVAL;
if (len == 0)
return 0;
-
- host_start = start & host_page_mask;
+
+ host_start = start & qemu_host_page_mask;
host_end = HOST_PAGE_ALIGN(end);
if (start > host_start) {
/* handle host page containing start */
for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
prot1 |= page_get_flags(addr);
}
- if (host_end == host_start + host_page_size) {
+ 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((void *)host_start, host_page_size, prot1 & PAGE_BITS);
+ ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS);
if (ret != 0)
return ret;
- host_start += host_page_size;
+ 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((void *)(host_end - host_page_size), host_page_size,
+ ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size,
prot1 & PAGE_BITS);
if (ret != 0)
return ret;
- host_end -= host_page_size;
+ host_end -= qemu_host_page_size;
}
-
+
/* handle the pages in the middle */
if (host_start < host_end) {
- ret = mprotect((void *)host_start, host_end - host_start, prot);
+ ret = mprotect(g2h(host_start), host_end - host_start, prot);
if (ret != 0)
return ret;
}
}
/* map an incomplete host page */
-int mmap_frag(unsigned long host_start,
- unsigned long start, unsigned long end,
- int prot, int flags, int fd, unsigned long offset)
+static int mmap_frag(abi_ulong real_start,
+ abi_ulong start, abi_ulong end,
+ int prot, int flags, int fd, abi_ulong offset)
{
- unsigned long host_end, ret, addr;
+ abi_ulong real_end, addr;
+ void *host_start;
int prot1, prot_new;
- host_end = host_start + host_page_size;
+ 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 = host_start; addr < host_end; addr++) {
+ 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 */
- ret = (long)mmap((void *)host_start, host_page_size, prot,
- flags | MAP_ANONYMOUS, -1, 0);
- if (ret == -1)
- return ret;
+ void *p = mmap(host_start, qemu_host_page_size, prot,
+ flags | MAP_ANONYMOUS, -1, 0);
+ if (p == MAP_FAILED)
+ return -1;
+ prot1 = prot;
}
prot1 &= PAGE_BITS;
/* adjust protection to be able to read */
if (!(prot1 & PROT_WRITE))
- mprotect((void *)host_start, host_page_size, prot1 | PROT_WRITE);
-
+ mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);
+
/* read the corresponding file data */
- pread(fd, (void *)start, end - start, offset);
-
+ pread(fd, g2h(start), end - start, offset);
+
/* put final protection */
if (prot_new != (prot1 | PROT_WRITE))
- mprotect((void *)host_start, host_page_size, prot_new);
+ mprotect(host_start, qemu_host_page_size, prot_new);
} else {
/* just update the protection */
if (prot_new != prot1) {
- mprotect((void *)host_start, host_page_size, prot_new);
+ 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
+
+/* 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;
+
+ 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 */
-long target_mmap(unsigned long start, unsigned long len, int prot,
- int flags, int fd, unsigned long offset)
+abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
+ int flags, int fd, abi_ulong offset)
{
- unsigned long ret, end, host_start, host_end, retaddr, host_offset, host_len;
+ abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
+ unsigned long host_start;
#ifdef DEBUG_MMAP
{
- printf("mmap: start=0x%lx len=0x%lx prot=%c%c%c flags=",
- start, len,
+ 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' : '-');
printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
break;
}
- printf("fd=%d offset=%lx\n", fd, offset);
+ printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset);
}
#endif
- if (offset & ~TARGET_PAGE_MASK)
- return -EINVAL;
+ if (offset & ~TARGET_PAGE_MASK) {
+ errno = EINVAL;
+ return -1;
+ }
len = TARGET_PAGE_ALIGN(len);
if (len == 0)
return start;
- host_start = start & host_page_mask;
+ real_start = start & qemu_host_page_mask;
if (!(flags & MAP_FIXED)) {
-#if defined(__alpha__) || defined(__sparc__)
- /* tell the kenel to search at the same place as i386 */
- if (host_start == 0)
- host_start = 0x40000000;
-#endif
- if (host_page_size != real_host_page_size) {
- /* NOTE: this code is only for debugging with '-p' option */
- /* reserve a memory area */
- host_len = HOST_PAGE_ALIGN(len) + host_page_size - TARGET_PAGE_SIZE;
- host_start = (long)mmap((void *)host_start, host_len, PROT_NONE,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if (host_start == -1)
- return host_start;
- host_end = host_start + host_len;
- start = HOST_PAGE_ALIGN(host_start);
- end = start + HOST_PAGE_ALIGN(len);
- if (start > host_start)
- munmap((void *)host_start, start - host_start);
- if (end < host_end)
- munmap((void *)end, host_end - end);
- /* use it as a fixed mapping */
- flags |= MAP_FIXED;
- } else {
- /* if not fixed, no need to do anything */
- host_offset = offset & host_page_mask;
- host_len = len + offset - host_offset;
- start = (long)mmap((void *)host_start, host_len,
- prot, flags, fd, host_offset);
- if (start == -1)
- return start;
- /* update start so that it points to the file position at 'offset' */
- if (!(flags & MAP_ANONYMOUS))
- start += offset - host_offset;
- goto the_end1;
+ 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;
+ return -1;
}
- }
-
- if (start & ~TARGET_PAGE_MASK)
- return -EINVAL;
- end = start + len;
- host_end = HOST_PAGE_ALIGN(end);
-
- /* worst case: we cannot map the file because the offset is not
- aligned, so we read it */
- if (!(flags & MAP_ANONYMOUS) &&
- (offset & ~host_page_mask) != (start & ~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 & MAP_TYPE) == MAP_SHARED &&
- (prot & PROT_WRITE))
- return -EINVAL;
- retaddr = target_mmap(start, len, prot | PROT_WRITE,
- MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
- -1, 0);
- if (retaddr == -1)
- return retaddr;
- pread(fd, (void *)start, len, offset);
- if (!(prot & PROT_WRITE)) {
- ret = target_mprotect(start, len, prot);
- if (ret != 0)
- return ret;
+ /* 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)
+ return -1;
+ /* update start so that it points to the file position at 'offset' */
+ host_start = (unsigned long)p;
+ if (!(flags & MAP_ANONYMOUS))
+ host_start += offset - host_offset;
+ start = h2g(host_start);
+ } else {
+ if (start & ~TARGET_PAGE_MASK) {
+ errno = EINVAL;
+ return -1;
}
- goto the_end;
- }
-
- /* handle the start of the mapping */
- if (start > host_start) {
- if (host_end == host_start + host_page_size) {
- /* one single host page */
- ret = mmap_frag(host_start, start, end,
+ end = start + len;
+ real_end = HOST_PAGE_ALIGN(end);
+
+ /* worst case: we cannot map the file because the offset is not
+ aligned, so we read it */
+ if (!(flags & MAP_ANONYMOUS) &&
+ (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 & MAP_TYPE) == MAP_SHARED &&
+ (prot & PROT_WRITE)) {
+ errno = EINVAL;
+ return -1;
+ }
+ retaddr = target_mmap(start, len, prot | PROT_WRITE,
+ MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
+ -1, 0);
+ if (retaddr == -1)
+ return -1;
+ pread(fd, g2h(start), len, offset);
+ if (!(prot & PROT_WRITE)) {
+ ret = target_mprotect(start, len, prot);
+ if (ret != 0)
+ return ret;
+ }
+ 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)
+ return ret;
+ goto the_end1;
+ }
+ ret = mmap_frag(real_start, start, real_start + qemu_host_page_size,
prot, flags, fd, offset);
if (ret == -1)
return ret;
- goto the_end1;
+ 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)
+ return -1;
+ real_end -= qemu_host_page_size;
+ }
+
+ /* map the middle (easier) */
+ if (real_start < real_end) {
+ void *p;
+ unsigned long offset1;
+ if (flags & MAP_ANONYMOUS)
+ 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)
+ return -1;
}
- ret = mmap_frag(host_start, start, host_start + host_page_size,
- prot, flags, fd, offset);
- if (ret == -1)
- return ret;
- host_start += host_page_size;
- }
- /* handle the end of the mapping */
- if (end < host_end) {
- ret = mmap_frag(host_end - host_page_size,
- host_end - host_page_size, host_end,
- prot, flags, fd,
- offset + host_end - host_page_size - start);
- if (ret == -1)
- return ret;
- host_end -= host_page_size;
- }
-
- /* map the middle (easier) */
- if (host_start < host_end) {
- unsigned long offset1;
- if (flags & MAP_ANONYMOUS)
- offset1 = 0;
- else
- offset1 = offset + host_start - start;
- ret = (long)mmap((void *)host_start, host_end - host_start,
- prot, flags, fd, offset1);
- if (ret == -1)
- return ret;
}
the_end1:
page_set_flags(start, start + len, prot | PAGE_VALID);
the_end:
#ifdef DEBUG_MMAP
- printf("ret=0x%lx\n", (long)start);
+ printf("ret=0x" TARGET_FMT_lx "\n", start);
page_dump(stdout);
printf("\n");
#endif
return start;
}
-int target_munmap(unsigned long start, unsigned long len)
+int target_munmap(abi_ulong start, abi_ulong len)
{
- unsigned long end, host_start, host_end, addr;
+ abi_ulong end, real_start, real_end, addr;
int prot, ret;
#ifdef DEBUG_MMAP
if (len == 0)
return -EINVAL;
end = start + len;
- host_start = start & host_page_mask;
- host_end = HOST_PAGE_ALIGN(end);
+ real_start = start & qemu_host_page_mask;
+ real_end = HOST_PAGE_ALIGN(end);
- if (start > host_start) {
+ if (start > real_start) {
/* handle host page containing start */
prot = 0;
- for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
+ for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
prot |= page_get_flags(addr);
}
- if (host_end == host_start + host_page_size) {
- for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
+ 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 = host_end;
+ end = real_end;
}
if (prot != 0)
- host_start += host_page_size;
+ real_start += qemu_host_page_size;
}
- if (end < host_end) {
+ if (end < real_end) {
prot = 0;
- for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
+ for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
prot |= page_get_flags(addr);
}
if (prot != 0)
- host_end -= host_page_size;
+ real_end -= qemu_host_page_size;
}
-
+
/* unmap what we can */
- if (host_start < host_end) {
- ret = munmap((void *)host_start, host_end - host_start);
+ if (real_start < real_end) {
+ ret = munmap(g2h(real_start), real_end - real_start);
if (ret != 0)
return ret;
}
/* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
blocks which have been allocated starting on a host page */
-long target_mremap(unsigned long old_addr, unsigned long old_size,
- unsigned long new_size, unsigned long flags,
- unsigned long new_addr)
+abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
+ abi_ulong new_size, unsigned long flags,
+ abi_ulong new_addr)
{
int prot;
+ unsigned long host_addr;
/* XXX: use 5 args syscall */
- new_addr = (long)mremap((void *)old_addr, old_size, new_size, flags);
- if (new_addr == -1)
- return new_addr;
+ host_addr = (long)mremap(g2h(old_addr), old_size, new_size, flags);
+ if (host_addr == -1)
+ return -1;
+ new_addr = h2g(host_addr);
prot = page_get_flags(old_addr);
page_set_flags(old_addr, old_addr + old_size, 0);
page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID);
return new_addr;
}
-int target_msync(unsigned long start, unsigned long len, int flags)
+int target_msync(abi_ulong start, abi_ulong len, int flags)
{
- unsigned long end;
+ abi_ulong end;
if (start & ~TARGET_PAGE_MASK)
return -EINVAL;
return -EINVAL;
if (end == start)
return 0;
-
- start &= host_page_mask;
- return msync((void *)start, end - start, flags);
-}
+ start &= qemu_host_page_mask;
+ return msync(g2h(start), end - start, flags);
+}
projects / qemu.git / blobdiff