* mips-tdep.c (non_heuristic_proc_desc): Search using the specified

[deliverable/binutils-gdb.git] / gdb / mips-tdep.c

diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index 9638b0862f433b63c05679e9bc8a103c964a1b8f..0543d6565e8c0dc65e1f17a8962b6505f8bdcdac 100644 (file)
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -2352,38 +2352,70 @@ non_heuristic_proc_desc (CORE_ADDR pc, CORE_ADDR *addrptr)
        {
          int low, mid, high;
          char *ptr;
+         CORE_ADDR pdr_pc;
 
          low = 0;
          high = priv->size / 32;
 
+         /* We've found a .pdr section describing this objfile.  We want to
+            find the entry which describes this code address.  The .pdr
+            information is not very descriptive; we have only a function
+            start address.  We have to look for the closest entry, because
+            the local symbol at the beginning of this function may have
+            been stripped - so if we ask the symbol table for the start
+            address we may get a preceding global function.  */
+
+         /* First, find the last .pdr entry starting at or before PC.  */
          do
            {
-             CORE_ADDR pdr_pc;
-
              mid = (low + high) / 2;
 
              ptr = priv->contents + mid * 32;
              pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr);
              pdr_pc += ANOFFSET (sec->objfile->section_offsets,
                                  SECT_OFF_TEXT (sec->objfile));
-             if (pdr_pc == startaddr)
-               break;
-             if (pdr_pc > startaddr)
+
+             if (pdr_pc > pc)
                high = mid;
              else
                low = mid + 1;
            }
          while (low != high);
 
-         if (low != high)
+         /* Both low and high point one past the PDR of interest.  If
+            both are zero, that means this PC is before any region
+            covered by a PDR, i.e. pdr_pc for the first PDR entry is
+            greater than PC.  */
+         if (low > 0)
+           {
+             ptr = priv->contents + (low - 1) * 32;
+             pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr);
+             pdr_pc += ANOFFSET (sec->objfile->section_offsets,
+                                 SECT_OFF_TEXT (sec->objfile));
+           }
+
+         /* We don't have a range, so we have no way to know for sure
+            whether we're in the correct PDR or a PDR for a preceding
+            function and the current function was a stripped local
+            symbol.  But if the PDR's PC is at least as great as the
+            best guess from the symbol table, assume that it does cover
+            the right area; if a .pdr section is present at all then
+            nearly every function will have an entry.  The biggest exception
+            will be the dynamic linker stubs; conveniently these are
+            placed before .text instead of after.  */
+
+         if (pc >= pdr_pc && pdr_pc >= startaddr)
            {
              struct symbol *sym = find_pc_function (pc);
 
+             if (addrptr)
+               *addrptr = pdr_pc;
+
              /* Fill in what we need of the proc_desc.  */
              proc_desc = (mips_extra_func_info_t)
                obstack_alloc (&sec->objfile->objfile_obstack,
                               sizeof (struct mips_extra_func_info));
-             PROC_LOW_ADDR (proc_desc) = startaddr;
+             PROC_LOW_ADDR (proc_desc) = pdr_pc;
 
              /* Only used for dummy frames.  */
              PROC_HIGH_ADDR (proc_desc) = 0;