wrap munmap to prevent unwanted unmaps

[ginge.git] / loader / emu.c

diff --git a/loader/emu.c b/loader/emu.c
index 8dc6d51..f14b0fc 100644 (file)
--- a/loader/emu.c
+++ b/loader/emu.c
@@ -1081,7 +1081,7 @@ static void *emu_mmap_dev(unsigned int length, int prot, int flags, unsigned int
     err("warning: uppermem @ %08x overflows by %d bytes\n",
         offset, umem + length - umem_end);
 
     err("warning: uppermem @ %08x overflows by %d bytes\n",
         offset, umem + length - umem_end);
 

-  dbg("upper mem @ %08x %d\n", offset, length);
+  dbg("upper mem @ %08x %x = %p\n", offset, length, umem);

   return umem;
 }
 
   return umem;
 }
 


@@ -1101,6 +1101,19 @@ void *emu_do_mmap(unsigned int length, int prot, int flags, int fd, unsigned int
   return MAP_FAILED;
 }
 
   return MAP_FAILED;
 }
 

+int emu_do_munmap(void *addr, unsigned int length)
+{
+  u8 *p = addr;
+
+  // don't allow to unmap upper mem
+  if ((u8 *)mmsp2.umem <= p && p < (u8 *)mmsp2.umem + 0x2000000) {
+    dbg("ignoring munmap: %p %x\n", addr, length);
+    return 0;
+  }
+
+  return -EAGAIN;
+}
+

 static void emu_sound_open(int fd)
 {
 #ifdef PND
 static void emu_sound_open(int fd)
 {
 #ifdef PND