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Skip relocation if OpenFirmware already loaded us at the right address.

This commit is contained in:
uwe 2001-11-21 21:38:00 +00:00
parent ec3da3741b
commit 8390d1903a
1 changed files with 14 additions and 3 deletions
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17
sys/arch/sparc/stand/common/srt0.S
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@ -1,4 +1,4 @@
/* $NetBSD: srt0.S,v 1.6 2001/05/20 17:28:16 uwe Exp $ */
/* $NetBSD: srt0.S,v 1.7 2001/11/21 21:38:00 uwe Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
@ -63,11 +63,19 @@ start:
save %o1, -CCFSZ, %sp
/*
* Relocate.
* Find which address we are at.
*/
1: call 2f
sethi %hi(1b), %l0
2: or %l0, %lo(1b), %l0
cmp %l0, %o7 ! %o7 contains actual address of 1b
beq 4f ! already there, no need to relocate
nop
2: add %o7, (start-1b), %l0
/*
* Relocate.
*/
add %o7, (start-1b), %l0
set start, %l1
set _edata, %o0
sub %o0, %l1, %l2 ! length
@ -78,6 +86,9 @@ start:
bg 3b
add %l1, 4, %l1
/*
* Jump to our relocated self.
*/
set 4f, %g1
jmp %g1
nop