#include "spr_defs.h"
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#include "or1200.h"
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// Linked from 0x200, so subtract 0x200 from each .org
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// Linked from 0x200, so subtract 0x200 from each .org
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.section .vectors, "ax"
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.section .vectors, "ax"
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/*
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/*
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.org 0x100
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.org 0x100
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_reset:
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_reset:
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l.nop
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l.nop
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l.j _reset_except
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l.j _reset_except
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l.nop
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l.nop
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*/
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*/
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/* This cannot be a regular function because it would waste the return register r9 of the interrupted procedure. */
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/* This cannot be a regular function because it would waste the return register r9 of the interrupted procedure. */
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/* Furthermore, if this would be a function and l.j handler would be outside of this, the return register set here would be use upon return of this function. */
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/* Furthermore, if this would be a function and l.j handler would be outside of this, the return register set here would be use upon return of this function. */
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/* However, the desired behavior is to finish the handler and let the return of the service routine simply restore the registers and return to the interrupted procedure. */
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/* However, the desired behavior is to finish the handler and let the return of the service routine simply restore the registers and return to the interrupted procedure. */
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#define intr_handler(handler) \
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#define intr_handler(handler) \
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l.nop ;\
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l.nop ;\
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l.addi r1,r1,-244 /*free 29 words (29 x 4 = 112) + 4 because stack points to contained data (stack is r1)*/;\
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l.addi r1,r1,-244 /*free 29 words (29 x 4 = 112) + 4 because stack points to contained data (stack is r1)*/;\
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/*plus 128 bytes not to mess with the previous frame pointer (32 register x 4 bytes = 128 bytes ) (required by C++ multiple threading) */;\
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/*plus 128 bytes not to mess with the previous frame pointer (32 register x 4 bytes = 128 bytes ) (required by C++ multiple threading) */;\
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l.sw 0x18(r1),r9 /*save register r9(return addr) to stack*/;\
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l.sw 0x18(r1),r9 /*save register r9(return addr) to stack*/;\
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l.jal store_regs /*save registers r3-r31 (except r9) to stack (r9 is changed here)*/;\
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l.jal store_regs /*save registers r3-r31 (except r9) to stack (r9 is changed here)*/;\
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l.nop ;\
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l.nop ;\
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;\
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;\
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l.movhi r9,hi(end_except) /*set return addr to end_except instruction*/;\
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l.movhi r9,hi(end_except) /*set return addr to end_except instruction*/;\
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l.ori r9,r9,lo(end_except)/*set return addr to end_except instruction*/;\
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l.ori r9,r9,lo(end_except)/*set return addr to end_except instruction*/;\
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l.j handler ;\
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l.j handler ;\
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l.nop
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l.nop
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.org 0x000
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.org 0x000
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_except_200:
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_except_200:
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intr_handler(buserr_except)
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intr_handler(buserr_except)
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.org 0x100
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.org 0x100
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_except_300:
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_except_300:
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intr_handler(dpf_except)
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intr_handler(dpf_except)
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.org 0x200
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.org 0x200
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_except_400:
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_except_400:
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intr_handler(ipf_except)
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intr_handler(ipf_except)
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.org 0x300
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.org 0x300
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_except_500:
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_except_500:
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intr_handler(tick_except)
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intr_handler(tick_except)
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.org 0x400
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.org 0x400
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_except_600:
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_except_600:
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intr_handler(align_except)
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intr_handler(align_except)
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.org 0x500
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.org 0x500
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_except_700:
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_except_700:
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intr_handler(illegal_except)
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intr_handler(illegal_except)
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.org 0x600
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.org 0x600
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_except_800:
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_except_800:
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intr_handler(ext_except)
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intr_handler(ext_except)
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.org 0x700
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.org 0x700
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_except_900:
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_except_900:
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intr_handler(dtlbmiss_except)
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intr_handler(dtlbmiss_except)
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.org 0x800
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.org 0x800
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_except_a00:
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_except_a00:
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intr_handler(itlbmiss_except)
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intr_handler(itlbmiss_except)
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.org 0x900
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.org 0x900
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_except_b00:
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_except_b00:
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intr_handler(range_except)
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intr_handler(range_except)
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.org 0xa00
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.org 0xa00
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_except_c00:
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_except_c00:
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intr_handler(syscall_except)
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intr_handler(syscall_except)
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.org 0xb00
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.org 0xb00
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_except_d00:
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_except_d00:
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intr_handler(res1_except)
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intr_handler(res1_except)
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.org 0xc00
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.org 0xc00
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_except_e00:
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_except_e00:
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intr_handler(trap_except)
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intr_handler(trap_except)
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.org 0xd00
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.org 0xd00
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_except_f00:
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_except_f00:
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intr_handler(res2_except)
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intr_handler(res2_except)
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store_regs: //save registers r3-r31 (except r9) to stack
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store_regs: //save registers r3-r31 (except r9) to stack
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l.sw 0x00(r1),r3
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l.sw 0x00(r1),r3
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l.sw 0x04(r1),r4
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l.sw 0x04(r1),r4
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l.sw 0x08(r1),r5
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l.sw 0x08(r1),r5
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l.sw 0x0c(r1),r6
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l.sw 0x0c(r1),r6
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l.sw 0x10(r1),r7
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l.sw 0x10(r1),r7
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l.sw 0x14(r1),r8
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l.sw 0x14(r1),r8
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l.sw 0x1c(r1),r10
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l.sw 0x1c(r1),r10
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l.sw 0x20(r1),r11
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l.sw 0x20(r1),r11
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l.sw 0x24(r1),r12
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l.sw 0x24(r1),r12
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l.sw 0x28(r1),r13
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l.sw 0x28(r1),r13
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l.sw 0x2c(r1),r14
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l.sw 0x2c(r1),r14
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l.sw 0x30(r1),r15
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l.sw 0x30(r1),r15
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l.sw 0x34(r1),r16
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l.sw 0x34(r1),r16
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l.sw 0x38(r1),r17
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l.sw 0x38(r1),r17
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l.sw 0x3c(r1),r18
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l.sw 0x3c(r1),r18
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l.sw 0x40(r1),r19
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l.sw 0x40(r1),r19
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l.sw 0x44(r1),r20
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l.sw 0x44(r1),r20
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l.sw 0x48(r1),r21
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l.sw 0x48(r1),r21
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l.sw 0x4c(r1),r22
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l.sw 0x4c(r1),r22
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l.sw 0x50(r1),r23
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l.sw 0x50(r1),r23
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l.sw 0x54(r1),r24
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l.sw 0x54(r1),r24
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l.sw 0x58(r1),r25
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l.sw 0x58(r1),r25
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l.sw 0x5c(r1),r26
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l.sw 0x5c(r1),r26
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l.sw 0x60(r1),r27
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l.sw 0x60(r1),r27
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l.sw 0x64(r1),r28
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l.sw 0x64(r1),r28
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l.sw 0x68(r1),r29
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l.sw 0x68(r1),r29
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l.sw 0x6c(r1),r30
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l.sw 0x6c(r1),r30
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l.sw 0x70(r1),r31
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l.sw 0x70(r1),r31
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l.jr r9
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l.jr r9
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l.nop
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l.nop
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end_except: //load back registers from stack r3-r31
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end_except: //load back registers from stack r3-r31
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l.lwz r3,0x00(r1)
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l.lwz r3,0x00(r1)
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l.lwz r4,0x04(r1)
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l.lwz r4,0x04(r1)
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l.lwz r5,0x08(r1)
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l.lwz r5,0x08(r1)
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l.lwz r6,0x0c(r1)
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l.lwz r6,0x0c(r1)
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l.lwz r7,0x10(r1)
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l.lwz r7,0x10(r1)
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l.lwz r8,0x14(r1)
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l.lwz r8,0x14(r1)
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l.lwz r9,0x18(r1)
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l.lwz r9,0x18(r1)
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l.lwz r10,0x1c(r1)
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l.lwz r10,0x1c(r1)
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l.lwz r11,0x20(r1)
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l.lwz r11,0x20(r1)
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l.lwz r12,0x24(r1)
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l.lwz r12,0x24(r1)
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l.lwz r13,0x28(r1)
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l.lwz r13,0x28(r1)
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l.lwz r14,0x2c(r1)
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l.lwz r14,0x2c(r1)
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l.lwz r15,0x30(r1)
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l.lwz r15,0x30(r1)
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l.lwz r16,0x34(r1)
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l.lwz r16,0x34(r1)
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l.lwz r17,0x38(r1)
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l.lwz r17,0x38(r1)
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l.lwz r18,0x3c(r1)
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l.lwz r18,0x3c(r1)
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l.lwz r19,0x40(r1)
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l.lwz r19,0x40(r1)
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l.lwz r20,0x44(r1)
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l.lwz r20,0x44(r1)
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l.lwz r21,0x48(r1)
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l.lwz r21,0x48(r1)
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l.lwz r22,0x4c(r1)
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l.lwz r22,0x4c(r1)
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l.lwz r23,0x50(r1)
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l.lwz r23,0x50(r1)
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l.lwz r24,0x54(r1)
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l.lwz r24,0x54(r1)
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l.lwz r25,0x58(r1)
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l.lwz r25,0x58(r1)
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l.lwz r26,0x5c(r1)
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l.lwz r26,0x5c(r1)
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l.lwz r27,0x60(r1)
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l.lwz r27,0x60(r1)
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l.lwz r28,0x64(r1)
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l.lwz r28,0x64(r1)
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l.lwz r29,0x68(r1)
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l.lwz r29,0x68(r1)
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l.lwz r30,0x6c(r1)
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l.lwz r30,0x6c(r1)
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l.lwz r31,0x70(r1)
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l.lwz r31,0x70(r1)
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l.addi r1,r1,244 //free stack places
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l.addi r1,r1,244 //free stack places
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l.rfe //recover SR register and prior PC (jumps back to program)
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l.rfe //recover SR register and prior PC (jumps back to program)
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l.nop
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l.nop
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