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Fix mmap to handle differing host/target page sizes, by Edgar E. Iglesias.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3291 c046a42c-6fe2-441c-8c8c-71466251a162
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@ -36,7 +36,8 @@ int target_mprotect(target_ulong start, target_ulong len, int prot)
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int prot1, ret;
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#ifdef DEBUG_MMAP
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printf("mprotect: start=0x%lx len=0x%lx prot=%c%c%c\n", start, len,
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printf("mprotect: start=0x" TARGET_FMT_lx
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"len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len,
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prot & PROT_READ ? 'r' : '-',
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prot & PROT_WRITE ? 'w' : '-',
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prot & PROT_EXEC ? 'x' : '-');
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@ -151,11 +152,11 @@ static int mmap_frag(target_ulong real_start,
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}
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/* NOTE: all the constants are the HOST ones */
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long target_mmap(target_ulong start, target_ulong len, int prot,
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target_long target_mmap(target_ulong start, target_ulong len, int prot,
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int flags, int fd, target_ulong offset)
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{
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target_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
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long host_start;
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unsigned long host_start;
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#if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__) || \
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defined(__ia64) || defined(__mips__)
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static target_ulong last_start = 0x40000000;
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@ -166,7 +167,8 @@ long target_mmap(target_ulong start, target_ulong len, int prot,
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#ifdef DEBUG_MMAP
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{
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printf("mmap: start=0x%lx len=0x%lx prot=%c%c%c flags=",
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printf("mmap: start=0x" TARGET_FMT_lx
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" len=0x" TARGET_FMT_lx " prot=%c%c%c flags=",
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start, len,
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prot & PROT_READ ? 'r' : '-',
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prot & PROT_WRITE ? 'w' : '-',
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@ -186,7 +188,7 @@ long target_mmap(target_ulong start, target_ulong len, int prot,
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printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
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break;
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}
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printf("fd=%d offset=%lx\n", fd, offset);
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printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset);
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}
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#endif
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@ -209,34 +211,59 @@ long target_mmap(target_ulong start, target_ulong len, int prot,
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last_start += HOST_PAGE_ALIGN(len);
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}
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#endif
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if (0 && qemu_host_page_size != qemu_real_host_page_size) {
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/* NOTE: this code is only for debugging with '-p' option */
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/* ??? Can also occur when TARGET_PAGE_SIZE > host page size. */
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/* reserve a memory area */
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/* ??? This needs fixing for remapping. */
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abort();
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host_len = HOST_PAGE_ALIGN(len) + qemu_host_page_size - TARGET_PAGE_SIZE;
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real_start = (long)mmap(g2h(real_start), host_len, PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (real_start == -1)
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return real_start;
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real_end = real_start + host_len;
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start = HOST_PAGE_ALIGN(real_start);
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end = start + HOST_PAGE_ALIGN(len);
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if (start > real_start)
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munmap((void *)g2h(real_start), start - real_start);
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if (end < real_end)
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munmap((void *)g2h(end), real_end - end);
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/* use it as a fixed mapping */
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flags |= MAP_FIXED;
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} else {
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/* if not fixed, no need to do anything */
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host_offset = offset & qemu_host_page_mask;
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host_len = len + offset - host_offset;
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if (qemu_host_page_size > qemu_real_host_page_size) {
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/*
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* The guest expects to see mmapped areas aligned to it's pagesize.
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* If the host's real page size is smaller than the guest's, we need
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* to fixup the maps. It is done by allocating a larger area,
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* displacing the map (if needed) and finally chopping off the spare
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* room at the edges.
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*/
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/*
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* We assume qemu_host_page_size is always the same as
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* TARGET_PAGE_SIZE, see exec.c. qemu_real_host_page_size is the
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* hosts real page size.
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*/
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target_ulong host_end;
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unsigned long host_aligned_start;
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host_len = HOST_PAGE_ALIGN(host_len + qemu_host_page_size
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- qemu_real_host_page_size);
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host_start = (unsigned long) mmap(real_start ?
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g2h(real_start) : NULL,
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host_len, prot, flags,
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fd, host_offset);
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if (host_start == -1)
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return -1;
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host_end = host_start + host_len;
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/* Find start and end, aligned to the targets pagesize with-in the
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large mmaped area. */
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host_aligned_start = TARGET_PAGE_ALIGN(host_start);
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if (!(flags & MAP_ANONYMOUS))
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host_aligned_start += offset - host_offset;
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start = h2g(host_aligned_start);
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end = start + TARGET_PAGE_ALIGN(len);
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/* Chop off the leftovers, if any. */
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if (host_aligned_start > host_start)
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munmap((void *)host_start, host_aligned_start - host_start);
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if (end < host_end)
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munmap((void *)g2h(end), host_end - end);
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goto the_end1;
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} else {
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/* if not fixed, no need to do anything */
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host_start = (long)mmap(real_start ? g2h(real_start) : NULL,
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host_len, prot, flags, fd, host_offset);
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if (host_start == -1)
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return host_start;
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return -1;
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/* update start so that it points to the file position at 'offset' */
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if (!(flags & MAP_ANONYMOUS))
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host_start += offset - host_offset;
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@ -267,7 +294,7 @@ abort();
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MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
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-1, 0);
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if (retaddr == -1)
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return retaddr;
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return -1;
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pread(fd, g2h(start), len, offset);
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if (!(prot & PROT_WRITE)) {
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ret = target_mprotect(start, len, prot);
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@ -300,7 +327,7 @@ abort();
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prot, flags, fd,
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offset + real_end - qemu_host_page_size - start);
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if (ret == -1)
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return ret;
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return -1;
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real_end -= qemu_host_page_size;
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}
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@ -314,13 +341,13 @@ abort();
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ret = (long)mmap(g2h(real_start), real_end - real_start,
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prot, flags, fd, offset1);
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if (ret == -1)
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return ret;
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return -1;
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}
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the_end1:
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page_set_flags(start, start + len, prot | PAGE_VALID);
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the_end:
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#ifdef DEBUG_MMAP
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printf("ret=0x%lx\n", (long)start);
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printf("ret=0x%llx\n", start);
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page_dump(stdout);
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printf("\n");
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#endif
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@ -381,17 +408,18 @@ int target_munmap(target_ulong start, target_ulong len)
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/* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
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blocks which have been allocated starting on a host page */
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long target_mremap(target_ulong old_addr, target_ulong old_size,
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target_long target_mremap(target_ulong old_addr, target_ulong old_size,
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target_ulong new_size, unsigned long flags,
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target_ulong new_addr)
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{
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int prot;
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unsigned long host_addr;
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/* XXX: use 5 args syscall */
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new_addr = (long)mremap(g2h(old_addr), old_size, new_size, flags);
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if (new_addr == -1)
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return new_addr;
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new_addr = h2g(new_addr);
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host_addr = (long)mremap(g2h(old_addr), old_size, new_size, flags);
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if (host_addr == -1)
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return -1;
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new_addr = h2g(host_addr);
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prot = page_get_flags(old_addr);
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page_set_flags(old_addr, old_addr + old_size, 0);
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page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID);
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@ -164,10 +164,10 @@ int do_vm86(CPUX86State *env, long subfunction, target_ulong v86_addr);
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/* mmap.c */
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int target_mprotect(target_ulong start, target_ulong len, int prot);
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long target_mmap(target_ulong start, target_ulong len, int prot,
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target_long target_mmap(target_ulong start, target_ulong len, int prot,
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int flags, int fd, target_ulong offset);
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int target_munmap(target_ulong start, target_ulong len);
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long target_mremap(target_ulong old_addr, target_ulong old_size,
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target_long target_mremap(target_ulong old_addr, target_ulong old_size,
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target_ulong new_size, unsigned long flags,
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target_ulong new_addr);
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int target_msync(target_ulong start, target_ulong len, int flags);
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