forked from cores/microwatt
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
113 lines
2.2 KiB
ArmAsm
113 lines
2.2 KiB
ArmAsm
5 years ago
|
/* Copyright 2013-2014 IBM Corp.
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
||
|
|
* implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define STACK_TOP 0x4000
|
||
|
|
|
||
|
|
/* Load an immediate 64-bit value into a register */
|
||
|
|
#define LOAD_IMM64(r, e) \
|
||
|
|
lis r,(e)@highest; \
|
||
|
|
ori r,r,(e)@higher; \
|
||
|
|
rldicr r,r, 32, 31; \
|
||
|
|
oris r,r, (e)@h; \
|
||
|
|
ori r,r, (e)@l;
|
||
|
|
|
||
|
|
.section ".head","ax"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Microwatt currently enters in LE mode at 0x0, so we don't need to
|
||
|
|
* do any endian fix ups
|
||
|
|
*/
|
||
|
|
. = 0
|
||
|
|
.global _start
|
||
|
|
_start:
|
||
|
|
b boot_entry
|
||
|
|
|
||
|
|
.global boot_entry
|
||
|
|
boot_entry:
|
||
|
|
/* setup stack */
|
||
|
|
LOAD_IMM64(%r1, STACK_TOP - 0x100)
|
||
|
|
LOAD_IMM64(%r12, main)
|
||
|
|
mtctr %r12
|
||
|
|
bctrl
|
||
|
|
attn // terminate on exit
|
||
|
|
b .
|
||
|
|
|
||
|
|
/* Read a location with translation on */
|
||
|
|
.globl test_read
|
||
|
|
test_read:
|
||
|
|
mfmsr %r9
|
||
|
|
ori %r8,%r9,0x10 /* set MSR_DR */
|
||
|
|
mtmsrd %r8,0
|
||
|
|
mr %r6,%r3
|
||
|
|
li %r3,0
|
||
|
|
ld %r5,0(%r6)
|
||
|
|
li %r3,1
|
||
|
|
/* land here if DSI occurred */
|
||
|
|
mtmsrd %r9,0
|
||
|
|
std %r5,0(%r4)
|
||
|
|
blr
|
||
|
|
|
||
|
|
/* Write a location with translation on */
|
||
|
|
.globl test_write
|
||
|
|
test_write:
|
||
|
|
mfmsr %r9
|
||
|
|
ori %r8,%r9,0x10 /* set MSR_DR */
|
||
|
|
mtmsrd %r8,0
|
||
|
|
mr %r6,%r3
|
||
|
|
li %r3,0
|
||
|
|
std %r4,0(%r6)
|
||
|
|
li %r3,1
|
||
|
|
/* land here if DSI occurred */
|
||
|
|
mtmsrd %r9,0
|
||
|
|
blr
|
||
|
|
|
||
|
|
#define EXCEPTION(nr) \
|
||
|
|
.= nr ;\
|
||
|
|
attn
|
||
|
|
|
||
|
|
/* DSI vector - skip the failing instruction + the next one */
|
||
|
|
. = 0x300
|
||
|
|
mtsprg0 %r10
|
||
|
|
mfsrr0 %r10
|
||
|
|
addi %r10,%r10,8
|
||
|
|
mtsrr0 %r10
|
||
|
|
rfid
|
||
|
|
|
||
|
|
/* More exception stubs */
|
||
|
|
EXCEPTION(0x380)
|
||
|
|
EXCEPTION(0x400)
|
||
|
|
EXCEPTION(0x480)
|
||
|
|
EXCEPTION(0x500)
|
||
|
|
EXCEPTION(0x600)
|
||
|
|
EXCEPTION(0x700)
|
||
|
|
EXCEPTION(0x800)
|
||
|
|
EXCEPTION(0x900)
|
||
|
|
EXCEPTION(0x980)
|
||
|
|
EXCEPTION(0xa00)
|
||
|
|
EXCEPTION(0xb00)
|
||
|
|
EXCEPTION(0xc00)
|
||
|
|
EXCEPTION(0xd00)
|
||
|
|
EXCEPTION(0xe00)
|
||
|
|
EXCEPTION(0xe20)
|
||
|
|
EXCEPTION(0xe40)
|
||
|
|
EXCEPTION(0xe60)
|
||
|
|
EXCEPTION(0xe80)
|
||
|
|
EXCEPTION(0xf00)
|
||
|
|
EXCEPTION(0xf20)
|
||
|
|
EXCEPTION(0xf40)
|
||
|
|
EXCEPTION(0xf60)
|
||
|
|
EXCEPTION(0xf80)
|