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Some assemblers will optimise addresses within .text into pc-relative 

references.  Bogus for our MMU trampoline code which is relocated to
the last physical page before being invoked.  This hack enforces all
addresses wrt the MMU trampoline code not to be pc-relative.
This commit is contained in:
gmcgarry 2002-02-10 00:47:59 +00:00
parent 70d5890284
commit 0b0cdf630f
1 changed files with 17 additions and 4 deletions
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21
sys/arch/hp300/hp300/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.118 2001/12/08 04:01:48 gmcgarry Exp $ */
/* $NetBSD: locore.s,v 1.119 2002/02/10 00:47:59 gmcgarry Exp $ */
/*
* Copyright (c) 1994, 1995 Gordon W. Ross
@ -412,8 +412,18 @@ Lhpmmu2:
movl %d1,INTIOBASE+MMUBASE+MMUSSTP | load in sysseg table register
Lstploaddone:
lea MAXADDR,%a2 | PA of last RAM page
#if 0
ASRELOC(Lhighcode, %a1) | addr of high code
ASRELOC(Lehighcode, %a3) | end addr
#else
/* don't want pc-relative addressing */
.word 0x43f9 | lea Lhighcode, %a1
.long Lhighcode
addl %a5, %a1
.word 0x47f9 | lea Lehighcode, %a3
.long Lehighcode
addl %a5, %a3
#endif
Lcodecopy:
movw %a1@+,%a2@+ | copy a word
cmpl %a3,%a1 | done yet?
@ -453,18 +463,21 @@ Lhighcode:
.long 0x4e7b0003 | movc %d0,%tc
movl #0x80008000,%d0
movc %d0,%cacr | turn on both caches
jmp Lenab1
.word 0x4ef9 | jmp Lenab1
.long Lenab1 | (forced not be be pc-relative)
Lmotommu2:
movl #MMU_IEN+MMU_FPE,INTIOBASE+MMUBASE+MMUCMD
| enable 68881 and i-cache
RELOC(prototc, %a2)
movl #0x82c0aa00,%a2@ | value to load TC with
pmove %a2@,%tc | load it
jmp Lenab1
.word 0x4ef9 | jmp Lenab1
.long Lenab1 | (forced not be be pc-relative)
Lhpmmu3:
movl #0,INTIOBASE+MMUBASE+MMUCMD | clear external cache
movl #MMU_ENAB,INTIOBASE+MMUBASE+MMUCMD | turn on MMU
jmp Lenab1 | jmp to mapped code
.word 0x4ef9 | jmp Lenab1
.long Lenab1 | (forced not be be pc-relative)
Lehighcode:
/*