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187 lines
3.8 KiB
ArmAsm
187 lines
3.8 KiB
ArmAsm
/* 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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#define STACK_TOP 0x4000
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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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/* Microwatt currently enters in LE mode at 0x0 */
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. = 0
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.global _start
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_start:
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LOAD_IMM64(%r12, 0x000000000ffffff)
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mtdec %r12
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LOAD_IMM64(%r12, 0x9000000000008003)
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mtmsrd %r12 // EE on
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/* setup stack */
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LOAD_IMM64(%r1, STACK_TOP - 0x100)
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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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#define EXCEPTION(nr) \
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.= nr ;\
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b .
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/* More exception stubs */
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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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. = 0x500
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b __isr
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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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// ISR data
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#define REDZONE_SIZE (512)
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#define REG_SAVE_SIZE ((32 + 5)*8)
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#define STACK_FRAME_C_MINIMAL 64
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#define SAVE_NIA (32*8)
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#define SAVE_LR (33*8)
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#define SAVE_CTR (34*8)
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#define SAVE_CR (35*8)
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#define SAVE_SRR1 (36*8)
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__isr:
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/*
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* Assume where we are coming from has a stack and can save there.
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* We save the full register set. Since we are calling out to C, we
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* could just save the ABI volatile registers
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*/
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stdu %r1,-(REG_SAVE_SIZE+REDZONE_SIZE)(%r1)
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std %r0, 1*8(%r1)
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// std %r1, 1*8(%r1)
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std %r2, 2*8(%r1)
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std %r3, 3*8(%r1)
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std %r4, 4*8(%r1)
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std %r5, 5*8(%r1)
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std %r6, 6*8(%r1)
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std %r7, 7*8(%r1)
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std %r8, 8*8(%r1)
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std %r9, 9*8(%r1)
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std %r10, 10*8(%r1)
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std %r11, 11*8(%r1)
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std %r12, 12*8(%r1)
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std %r13, 13*8(%r1)
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std %r14, 14*8(%r1)
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std %r15, 15*8(%r1)
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std %r16, 16*8(%r1)
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std %r17, 17*8(%r1)
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std %r18, 18*8(%r1)
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std %r19, 19*8(%r1)
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std %r20, 20*8(%r1)
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std %r21, 21*8(%r1)
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std %r22, 22*8(%r1)
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std %r23, 23*8(%r1)
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std %r24, 24*8(%r1)
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std %r25, 25*8(%r1)
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std %r26, 26*8(%r1)
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std %r27, 27*8(%r1)
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std %r28, 28*8(%r1)
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std %r29, 29*8(%r1)
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std %r30, 30*8(%r1)
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std %r31, 31*8(%r1)
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mfsrr0 %r0
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std %r0, SAVE_NIA*8(%r1)
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mflr %r0
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std %r0, SAVE_LR*8(%r1)
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mfctr %r0
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std %r0, SAVE_CTR*8(%r1)
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mfcr %r0
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std %r0, SAVE_CR*8(%r1)
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mfsrr1 %r0
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std %r0, SAVE_SRR1*8(%r1)
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stdu %r1,-STACK_FRAME_C_MINIMAL(%r1)
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LOAD_IMM64(%r3, isr)
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mtctr %r3,
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bctrl
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nop
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ld %r1, 0(%r1)
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ld %r0, 1*8(%r1)
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// ld %r1, 1*8(%r1) // do this at rfid
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ld %r2, 2*8(%r1)
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// ld %r3, 3*8(%r1) // do this at rfid
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ld %r4, 4*8(%r1)
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ld %r5, 5*8(%r1)
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ld %r6, 6*8(%r1)
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ld %r7, 7*8(%r1)
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ld %r8, 8*8(%r1)
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ld %r9, 9*8(%r1)
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ld %r10, 10*8(%r1)
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ld %r11, 11*8(%r1)
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ld %r12, 12*8(%r1)
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ld %r13, 13*8(%r1)
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ld %r14, 14*8(%r1)
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ld %r15, 15*8(%r1)
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ld %r16, 16*8(%r1)
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ld %r17, 17*8(%r1)
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ld %r18, 18*8(%r1)
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ld %r19, 19*8(%r1)
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ld %r20, 20*8(%r1)
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ld %r21, 21*8(%r1)
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ld %r22, 22*8(%r1)
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ld %r23, 23*8(%r1)
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ld %r24, 24*8(%r1)
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ld %r25, 25*8(%r1)
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ld %r26, 26*8(%r1)
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ld %r27, 27*8(%r1)
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ld %r28, 28*8(%r1)
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ld %r29, 29*8(%r1)
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ld %r30, 30*8(%r1)
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ld %r31, 31*8(%r1)
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ld %r3, SAVE_LR*8(%r1)
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mtlr %r3
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ld %r3, SAVE_CTR*8(%r1)
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mtctr %r3
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ld %r3, SAVE_CR*8(%r1)
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mtcr %r3
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ld %r3, SAVE_SRR1*8(%r1)
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mtsrr1 %r3
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ld %r3, SAVE_NIA*8(%r1)
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mtsrr0 %r3
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/* restore %r3 */
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ld %r3, 3*8(%r1)
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/* do final fixup r1 */
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ld %r1, 0*8(%r1)
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rfid
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