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microwatt/tests/spr_read/head.S

47 lines
1.1 KiB
ArmAsm

/* 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 0x2000
/* 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 .