[src/trunk]: src/lib/csu/mips Enlarge the stack frame to 16 bytes, and store ...

[simonb <simonb%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f63375a1d990
branches:  trunk
changeset: 513870:f63375a1d990
user:      simonb <simonb%NetBSD.org@localhost>
date:      Thu Aug 16 03:44:46 2001 +0000

description:
Enlarge the stack frame to 16 bytes, and store the return address 8
bytes in instead of at the start, to leave room for a .cpload to store
the gp at offset 0 in the frame.  Allow 8 bytes for each (for mips64
one day...).

.cpload overwrite problems noted by Michael Hitch.

diffstat:

 lib/csu/mips/dot_init.h |  16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diffs (43 lines):

diff -r d02f20a47c79 -r f63375a1d990 lib/csu/mips/dot_init.h
--- a/lib/csu/mips/dot_init.h   Thu Aug 16 01:47:45 2001 +0000
+++ b/lib/csu/mips/dot_init.h   Thu Aug 16 03:44:46 2001 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: dot_init.h,v 1.1 2001/07/17 15:20:23 simonb Exp $ */
+/* $NetBSD: dot_init.h,v 1.2 2001/08/16 03:44:46 simonb Exp $ */
 
 /*-
  * Copyright (c) 2001 Ross Harvey
@@ -50,26 +50,26 @@
 #define        ra      "$31"
 
 /*
- * XXX:
- *   stack frame is only 8 bytes long (big enough to store the caller's RA).
- *   Does it need to be 32 bytes to keep gdb happy?
+ *   The stack frame is 16 bytes long; big enough to store the GP saved
+ *   by .cpload (at offset 0) and the caller's RA (at offset 8),
+ *   allowing for 64bit addresses.
  */
 #define        MD_SECTION_PROLOGUE(sect, entry_pt)             \
                __asm (                                 \
                ".section "#sect",\"ax\",@progbits      \n"\
                #entry_pt":                             \n"\
-               "       subu    $sp,$sp,8               \n"\
-               "       sw      "ra",0($sp)             \n"\
+               "       subu    $sp,$sp,16              \n"\
+               "       sw      "ra",8($sp)             \n"\
                "       /* fall thru */                 \n"\
                ".previous")
 
 #define        MD_SECTION_EPILOGUE(sect)                       \
                __asm (                                 \
                ".section "#sect",\"ax\",@progbits      \n"\
-               "       lw      "ra",0($sp)             \n"\
+               "       lw      "ra",8($sp)             \n"\
                "       .set    noreorder               \n"\
                "       j       "ra"                    \n"\
-               "       addu    $sp,$sp,8               \n"\
+               "       addu    $sp,$sp,16              \n"\
                "       .set    reorder                 \n"\
                ".previous")