|
|
|
|
/* Copyright 2020 Paul Mackerras, 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.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
/* 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:
|
|
|
|
|
LOAD_IMM64(%r10,__bss_start)
|
|
|
|
|
LOAD_IMM64(%r11,__bss_end)
|
|
|
|
|
subf %r11,%r10,%r11
|
|
|
|
|
addi %r11,%r11,63
|
|
|
|
|
srdi. %r11,%r11,6
|
|
|
|
|
beq 2f
|
|
|
|
|
mtctr %r11
|
|
|
|
|
1: dcbz 0,%r10
|
|
|
|
|
addi %r10,%r10,64
|
|
|
|
|
bdnz 1b
|
|
|
|
|
|
|
|
|
|
2: LOAD_IMM64(%r1,__stack_top)
|
|
|
|
|
li %r0,0
|
|
|
|
|
stdu %r0,-16(%r1)
|
|
|
|
|
mtsprg2 %r0
|
|
|
|
|
LOAD_IMM64(%r12, main)
|
|
|
|
|
mtctr %r12
|
|
|
|
|
bctrl
|
|
|
|
|
attn // terminate on exit
|
|
|
|
|
b .
|
|
|
|
|
|
|
|
|
|
exception:
|
|
|
|
|
mtsprg3 %r0
|
|
|
|
|
mfsprg2 %r0
|
|
|
|
|
cmpdi %r0,0
|
|
|
|
|
bne call_ret
|
|
|
|
|
attn
|
|
|
|
|
|
|
|
|
|
#define EXCEPTION(nr) \
|
|
|
|
|
.= nr ;\
|
|
|
|
|
li %r0,nr ;\
|
|
|
|
|
b exception
|
|
|
|
|
|
|
|
|
|
EXCEPTION(0x300)
|
|
|
|
|
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)
|
|
|
|
|
|
|
|
|
|
. = 0x1000
|
|
|
|
|
/*
|
|
|
|
|
* Call a function in a context with a given MSR value.
|
|
|
|
|
* r3, r4 = args; r5 = function, r6 = MSR,
|
|
|
|
|
* r7 = array in which to return r3 and r4
|
|
|
|
|
* Return value is trap number or 0.
|
|
|
|
|
*/
|
|
|
|
|
.globl callit
|
|
|
|
|
callit:
|
|
|
|
|
mflr %r0
|
|
|
|
|
std %r0,16(%r1)
|
|
|
|
|
stdu %r1,-256(%r1)
|
|
|
|
|
mfcr %r8
|
|
|
|
|
stw %r8,100(%r1)
|
|
|
|
|
std %r13,104(%r1)
|
|
|
|
|
std %r14,112(%r1)
|
|
|
|
|
std %r15,120(%r1)
|
|
|
|
|
std %r16,128(%r1)
|
|
|
|
|
std %r17,136(%r1)
|
|
|
|
|
std %r18,144(%r1)
|
|
|
|
|
std %r19,152(%r1)
|
|
|
|
|
std %r20,160(%r1)
|
|
|
|
|
std %r21,168(%r1)
|
|
|
|
|
std %r22,176(%r1)
|
|
|
|
|
std %r23,184(%r1)
|
|
|
|
|
std %r24,192(%r1)
|
|
|
|
|
std %r25,200(%r1)
|
|
|
|
|
std %r26,208(%r1)
|
|
|
|
|
std %r27,216(%r1)
|
|
|
|
|
std %r28,224(%r1)
|
|
|
|
|
std %r29,232(%r1)
|
|
|
|
|
std %r30,240(%r1)
|
|
|
|
|
std %r31,248(%r1)
|
|
|
|
|
li %r10,call_ret@l
|
|
|
|
|
mtlr %r10
|
|
|
|
|
mtsprg0 %r7
|
|
|
|
|
mtsprg1 %r1
|
|
|
|
|
mtsprg2 %r2
|
|
|
|
|
li %r11,0
|
|
|
|
|
mtsprg3 %r11
|
|
|
|
|
mtsrr0 %r5
|
|
|
|
|
mtsrr1 %r6
|
|
|
|
|
rfid
|
|
|
|
|
call_ret:
|
|
|
|
|
mfsprg0 %r7 /* restore regs in case of trap */
|
|
|
|
|
mfsprg1 %r1
|
|
|
|
|
mfsprg2 %r2
|
|
|
|
|
li %r0,0
|
|
|
|
|
mtsprg2 %r0
|
|
|
|
|
std %r3,0(%r7)
|
|
|
|
|
std %r4,8(%r7)
|
|
|
|
|
mfsprg3 %r3
|
|
|
|
|
lwz %r8,100(%r1)
|
|
|
|
|
mtcr %r8
|
|
|
|
|
ld %r13,104(%r1)
|
|
|
|
|
ld %r14,112(%r1)
|
|
|
|
|
ld %r15,120(%r1)
|
|
|
|
|
ld %r16,128(%r1)
|
|
|
|
|
ld %r17,136(%r1)
|
|
|
|
|
ld %r18,144(%r1)
|
|
|
|
|
ld %r19,152(%r1)
|
|
|
|
|
ld %r20,160(%r1)
|
|
|
|
|
ld %r21,168(%r1)
|
|
|
|
|
ld %r22,176(%r1)
|
|
|
|
|
ld %r23,184(%r1)
|
|
|
|
|
ld %r24,192(%r1)
|
|
|
|
|
ld %r25,200(%r1)
|
|
|
|
|
ld %r26,208(%r1)
|
|
|
|
|
ld %r27,216(%r1)
|
|
|
|
|
ld %r28,224(%r1)
|
|
|
|
|
ld %r29,232(%r1)
|
|
|
|
|
ld %r30,240(%r1)
|
|
|
|
|
ld %r31,248(%r1)
|
|
|
|
|
addi %r1,%r1,256
|
|
|
|
|
ld %r0,16(%r1)
|
|
|
|
|
mtlr %r0
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
.global test1
|
|
|
|
|
test1:
|
|
|
|
|
addi %r3,%r4,1
|
|
|
|
|
li %r3,0
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
.global test2
|
|
|
|
|
test2:
|
|
|
|
|
ld %r3,0(%r4)
|
|
|
|
|
li %r3,-1
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
.global test3
|
|
|
|
|
test3:
|
|
|
|
|
stw %r3,0(%r4)
|
|
|
|
|
li %r3,-1
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
.global test4
|
|
|
|
|
test4:
|
|
|
|
|
dcbt 0,%r3
|
|
|
|
|
li %r3,-1
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
.global test5
|
|
|
|
|
test5:
|
|
|
|
|
dcbtst 0,%r3
|
|
|
|
|
li %r3,-1
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
.global test6
|
|
|
|
|
test6:
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
b 1f
|
|
|
|
|
li %r3,2
|
|
|
|
|
blr
|
|
|
|
|
1: li %r3,1
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
.global test7
|
|
|
|
|
test7:
|
|
|
|
|
li %r4,1
|
|
|
|
|
cmpwi %r4,0
|
|
|
|
|
bne 1f
|
|
|
|
|
li %r3,-1
|
|
|
|
|
1: blr
|
|
|
|
|
|
|
|
|
|
.global test8
|
|
|
|
|
test8:
|
|
|
|
|
lfd %f0,0(%r3)
|
|
|
|
|
blr
|
