* ppc-sysv-tdep.c (ppc_sysv_abi_push_dummy_call): Set condition

[deliverable/binutils-gdb.git] / gdb / ppc-sysv-tdep.c

diff --git a/gdb/ppc-sysv-tdep.c b/gdb/ppc-sysv-tdep.c
index b172dc01d396a7718799091e4655f5195e041f8b..3824c99a6fa173a3cc5873bcdfd5aef0b9d41a3e 100644 (file)
--- a/gdb/ppc-sysv-tdep.c
+++ b/gdb/ppc-sysv-tdep.c
@@ -1,8 +1,8 @@
 /* Target-dependent code for PowerPC systems using the SVR4 ABI
    for GDB, the GNU debugger.
 
-   Copyright 2000, 2001, 2002, 2003, 2005 Free Software Foundation,
-   Inc.
+   Copyright 2000, 2001, 2002, 2003, 2005
+   Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -295,6 +295,24 @@ ppc_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
          /* Ensure that the stack is still 16 byte aligned.  */
          sp = align_down (sp, 16);
        }
+
+      /* The psABI says that "A caller of a function that takes a
+        variable argument list shall set condition register bit 6 to
+        1 if it passes one or more arguments in the floating-point
+        registers. It is strongly recommended that the caller set the
+        bit to 0 otherwise..."  Doing this for normal functions too
+        shouldn't hurt.  */
+      if (write_pass)
+       {
+         ULONGEST cr;
+
+         regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr);
+         if (freg > 1)
+           cr |= 0x02000000;
+         else
+           cr &= ~0x02000000;
+         regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr);
+       }
     }
 
   /* Update %sp.   */