[src/trunk]: src/sys/arch/pmax/stand/lib Fix an off-by-32 error - space was p...

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

details:   https://anonhg.NetBSD.org/src/rev/ff33bc706473
branches:  trunk
changeset: 471815:ff33bc706473
user:      simonb <simonb%NetBSD.org@localhost>
date:      Mon Apr 12 03:53:13 1999 +0000

description:
Fix an off-by-32 error - space was padded out to the 96th byte for the
DEC disk boot block header, but it's only 64 bytes long.  Gives us
another 32 bytes in the first stage.

Don't use a roll-your-own START_FRAME size and offsets for the stack
and ra - use the <mips/asm.h> provided CALLFRAME_SIZ, CALLFRAME_RA and
CALLFRAME_SP

diffstat:

 sys/arch/pmax/stand/lib/start.S |  20 ++++++++------------
 1 files changed, 8 insertions(+), 12 deletions(-)

diffs (49 lines):

diff -r 8c696ef19392 -r ff33bc706473 sys/arch/pmax/stand/lib/start.S
--- a/sys/arch/pmax/stand/lib/start.S   Mon Apr 12 01:53:06 1999 +0000
+++ b/sys/arch/pmax/stand/lib/start.S   Mon Apr 12 03:53:13 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: start.S,v 1.13 1999/04/11 04:27:53 simonb Exp $        */
+/*     $NetBSD: start.S,v 1.14 1999/04/12 03:53:13 simonb Exp $        */
 
 /*-
  * Copyright (c) 1999 The NetBSD Foundation, Inc.
@@ -107,22 +107,18 @@
        .word   Dec_Diskboot            /* loadAddr */
        .word   start                   /* execAddr */
        .word   16, 0                   /* map[0] numBlocks, startBlock */
-       .word   0,0, 0,0, 0,0, 0,0
-       .word   0,0, 0,0, 0,0, 0,0
+       .word   0,0, 0,0, 0,0, 0,0      /* pad to 64 bytes (start of label) */
 
 Label_goes_here:
-       .word   0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0
-       .word   0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0
+       .word   0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0  /* 276 bytes for ... */
+       .word   0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0  /* ... BSD label */
        .word   0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0
        .word   0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0
        .word   0,0, 0,0, 0
 #endif
 
        .extern callv, 4
-/*
- * Amount to take off of the stack for the benefit of the debugger.
- */
-#define START_FRAME    ((4 * 4) + 4 + 4)
+
 
        .globl  start
 start:
@@ -130,9 +126,9 @@
 #ifdef __GP_SUPPORT__
        la      gp, _C_LABEL (_gp)
 #endif
-       la      sp, start - START_FRAME
-       sw      zero, START_FRAME - 4(sp)       # Zero out old ra for debugger
-       sw      zero, START_FRAME - 8(sp)       # Zero out old fp for debugger
+       la      sp, start - CALLFRAME_SIZ
+       sw      zero, CALLFRAME_RA(sp)          # Zero out old ra for debugger
+       sw      zero, CALLFRAME_SP(sp)          # Zero out old fp for debugger
        move    s0, a0                          # save argc
        move    s1, a1                          # save argv
        beq     a2, DEC_REX_MAGIC, 1f           # jump if boot from DS5000