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158 lines
2.9 KiB
ArmAsm
158 lines
2.9 KiB
ArmAsm
4 years ago
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/* Copyright 2013-2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Load an immediate 64-bit value into a register */
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#define LOAD_IMM64(r, e) \
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lis r,(e)@highest; \
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ori r,r,(e)@higher; \
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rldicr r,r, 32, 31; \
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oris r,r, (e)@h; \
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ori r,r, (e)@l;
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.section ".head","ax"
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/*
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* Microwatt currently enters in LE mode at 0x0, so we don't need to
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* do any endian fix ups
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*/
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. = 0
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.global _start
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_start:
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LOAD_IMM64(%r10,__bss_start)
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LOAD_IMM64(%r11,__bss_end)
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subf %r11,%r10,%r11
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addi %r11,%r11,63
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srdi. %r11,%r11,6
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beq 2f
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mtctr %r11
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1: dcbz 0,%r10
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addi %r10,%r10,64
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bdnz 1b
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2: LOAD_IMM64(%r1,__stack_top)
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li %r0,0
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stdu %r0,-16(%r1)
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mtsprg2 %r0
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LOAD_IMM64(%r12, main)
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mtctr %r12
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bctrl
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attn // terminate on exit
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b .
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exception:
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mfsprg2 %r0
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cmpdi %r0,0
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bne call_ret
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attn
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#define EXCEPTION(nr) \
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.= nr ;\
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li %r3,nr ;\
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b exception
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EXCEPTION(0x300)
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EXCEPTION(0x380)
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EXCEPTION(0x400)
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EXCEPTION(0x480)
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EXCEPTION(0x500)
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EXCEPTION(0x600)
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EXCEPTION(0x700)
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EXCEPTION(0x800)
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EXCEPTION(0x900)
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EXCEPTION(0x980)
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EXCEPTION(0xa00)
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EXCEPTION(0xb00)
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EXCEPTION(0xc00)
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EXCEPTION(0xd00)
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EXCEPTION(0xe00)
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EXCEPTION(0xe20)
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EXCEPTION(0xe40)
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EXCEPTION(0xe60)
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EXCEPTION(0xe80)
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EXCEPTION(0xf00)
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EXCEPTION(0xf20)
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EXCEPTION(0xf40)
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EXCEPTION(0xf60)
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EXCEPTION(0xf80)
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. = 0x1000
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/*
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* Call a function in a context with a given MSR value.
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* r3, r4 = args; r5 = function
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*/
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.globl callit
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callit:
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mflr %r0
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std %r0,16(%r1)
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stdu %r1,-256(%r1)
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mfcr %r8
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stw %r8,100(%r1)
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std %r13,104(%r1)
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std %r14,112(%r1)
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std %r15,120(%r1)
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std %r16,128(%r1)
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std %r17,136(%r1)
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std %r18,144(%r1)
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std %r19,152(%r1)
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std %r20,160(%r1)
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std %r21,168(%r1)
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std %r22,176(%r1)
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std %r23,184(%r1)
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std %r24,192(%r1)
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std %r25,200(%r1)
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std %r26,208(%r1)
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std %r27,216(%r1)
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std %r28,224(%r1)
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std %r29,232(%r1)
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std %r30,240(%r1)
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std %r31,248(%r1)
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mtsprg0 %r0
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mtsprg1 %r1
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mtsprg2 %r2
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mtctr %r5
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mr %r12,%r5
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bctrl
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call_ret:
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mfsprg0 %r0 /* restore regs in case of trap */
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mfsprg1 %r1
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mfsprg2 %r2
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li %r7,0
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mtsprg2 %r7
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mtlr %r0
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lwz %r8,100(%r1)
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mtcr %r8
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ld %r13,104(%r1)
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ld %r14,112(%r1)
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ld %r15,120(%r1)
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ld %r16,128(%r1)
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ld %r17,136(%r1)
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ld %r18,144(%r1)
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ld %r19,152(%r1)
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ld %r20,160(%r1)
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ld %r21,168(%r1)
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ld %r22,176(%r1)
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ld %r23,184(%r1)
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ld %r24,192(%r1)
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ld %r25,200(%r1)
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ld %r26,208(%r1)
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ld %r27,216(%r1)
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ld %r28,224(%r1)
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ld %r29,232(%r1)
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ld %r30,240(%r1)
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ld %r31,248(%r1)
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addi %r1,%r1,256
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blr
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