qemu/0010-qemu-cvs-mmap-amd64.patch

From: Alexander Graf <agraf@suse.de>

When executing 32-bit guest binaries on 64-bit hosts, mmap() can return
a 64-bit pointer. Tell mmap() to always map in 32-bit address space, so
we make 32-bit guest applications happy.

This is a hack and should not go upstream in its current form!

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 linux-user/mmap.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 994c02b..e24b63a 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -169,7 +169,7 @@ static int mmap_frag(abi_ulong real_start,
     if (prot1 == 0) {
         /* no page was there, so we allocate one */
         void *p = mmap(host_start, qemu_host_page_size, prot,
-                       flags | MAP_ANONYMOUS, -1, 0);
+                       flags | MAP_ANONYMOUS | MAP_32BIT, -1, 0);
         if (p == MAP_FAILED)
             return -1;
         prot1 = prot;
@@ -292,7 +292,7 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
          *  - shmat() with SHM_REMAP flag
          */
         ptr = mmap(g2h(addr), size, PROT_NONE,
-                   MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0);
+                   MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE|MAP_32BIT, -1, 0);
 
         /* ENOMEM, if host address space has no memory */
         if (ptr == MAP_FAILED) {
@@ -454,14 +454,14 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
            especially important if qemu_host_page_size >
            qemu_real_host_page_size */
         p = mmap(g2h(mmap_start),
-                 host_len, prot, flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
+                 host_len, prot, flags | MAP_FIXED | MAP_ANONYMOUS | MAP_32BIT, -1, 0);
         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_ANONYMOUS)) {
             p = mmap(g2h(mmap_start), len, prot, 
-                     flags | MAP_FIXED, fd, host_offset);
+                     flags | MAP_FIXED | MAP_32BIT, fd, host_offset);
             host_start += offset - host_offset;
         }
         start = h2g(host_start);
@@ -547,7 +547,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
             else
                 offset1 = offset + real_start - start;
             p = mmap(g2h(real_start), real_end - real_start,
-                     prot, flags, fd, offset1);
+                     prot, flags | MAP_32BIT, fd, offset1);
             if (p == MAP_FAILED)
                 goto fail;
         }
@@ -603,7 +603,7 @@ static void mmap_reserve(abi_ulong start, abi_ulong size)
     }
     if (real_start != real_end) {
         mmap(g2h(real_start), real_end - real_start, PROT_NONE,
-                 MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE,
+                 MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE | MAP_32BIT,
                  -1, 0);
     }
 }
-- 
1.6.0.2