Clear non-significant bits of address on memory access

[deliverable/binutils-gdb.git] / gdb / utils.c

diff --git a/gdb/utils.c b/gdb/utils.c
index b95dcfd5ce91e8871fd4ded48c69f2c613ddd8b1..2f8f06fb5a340cc74a73195618c12edd34eff7c3 100644 (file)
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -2724,6 +2724,23 @@ When set, debugging messages will be marked with seconds and microseconds."),
                           &setdebuglist, &showdebuglist);
 }
 
+/* See utils.h.  */
+
+CORE_ADDR
+address_significant (gdbarch *gdbarch, CORE_ADDR addr)
+{
+  /* Truncate address to the significant bits of a target address,
+     avoiding shifts larger or equal than the width of a CORE_ADDR.
+     The local variable ADDR_BIT stops the compiler reporting a shift
+     overflow when it won't occur.  */
+  int addr_bit = gdbarch_significant_addr_bit (gdbarch);
+
+  if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT))
+    addr &= ((CORE_ADDR) 1 << addr_bit) - 1;
+
+  return addr;
+}
+
 const char *
 paddress (struct gdbarch *gdbarch, CORE_ADDR addr)
 {