675 lines
11 KiB
ArmAsm
675 lines
11 KiB
ArmAsm
/*
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Copyright 2020 Shenzhen Academy of Aerospace Technology
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 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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Change Logs:
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Date Author Notes
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2020-10-16 Dystopia the first version
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*/
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#define PSR_INIT 0x10C0
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#define PREGS 0x80000000
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#define IMASK 0x90
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#define ICLEAR 0x9c
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#define NWINDOWS 8
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#define CPU_INTERRUPT_FRAME_SIZE (0x60 + 0x50 + 34 * 4)
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#define SPARC_PSR_PIL_MASK 0x00000F00
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#define SPARC_PSR_ET_MASK 0x00000020
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#define SPARC_PSR_CWP_MASK 0x07
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.text
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.globl system_vectors
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.globl _reset
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.globl _context_switch
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_reset:
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mov %g0, %asr16
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mov %g0, %asr17
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nop
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nop
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nop
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set PSR_INIT, %g1
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mov %g1, %psr
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nop
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nop
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nop
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mov %g0, %wim
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nop
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nop
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nop
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mov %g0, %g1
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mov %g0, %g2
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mov %g0, %g3
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mov %g0, %g4
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mov %g0, %g5
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mov %g0, %g6
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mov %g0, %g7
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mov 0x8, %g1
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1:
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mov %g0, %l0
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mov %g0, %l1
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mov %g0, %l2
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mov %g0, %l3
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mov %g0, %l4
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mov %g0, %l5
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mov %g0, %l6
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mov %g0, %l7
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mov %g0, %i0
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mov %g0, %i1
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mov %g0, %i2
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mov %g0, %i3
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mov %g0, %i4
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mov %g0, %i5
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mov %g0, %i6
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mov %g0, %i7
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subcc %g1, 1, %g1
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save
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bne 1b
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nop
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set 2, %g1
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mov %g1, %wim
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nop
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nop
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nop
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sethi %hi(system_vectors), %g1
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mov %g1, %tbr
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nop
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nop
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nop
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set PREGS, %g1
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set 0xffff, %g2
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st %g2, [%g1 + ICLEAR]
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st %g0, [%g1 + IMASK]
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set 0x7C47907F, %g2
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st %g2, [%g1 + 4]
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set PSR_INIT | 0x20, %g1
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mov %g1, %psr
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nop
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nop
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nop
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set _fsrinit, %g1
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ld [%g1], %fsr
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nop
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nop
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nop
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set _fpdata, %g1
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ldd [%g1], %f0
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ldd [%g1], %f2
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ldd [%g1], %f4
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ldd [%g1], %f6
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ldd [%g1], %f8
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ldd [%g1], %f10
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ldd [%g1], %f12
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ldd [%g1], %f14
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ldd [%g1], %f16
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ldd [%g1], %f18
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ldd [%g1], %f20
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ldd [%g1], %f22
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ldd [%g1], %f24
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ldd [%g1], %f26
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ldd [%g1], %f28
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ldd [%g1], %f30
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set __bss_start, %g2
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set __bss_end, %g3
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mov %g0, %g1
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bss_loop:
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std %g0, [%g2]
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add %g2, 8, %g2
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cmp %g2, %g3
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bleu,a bss_loop
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nop
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set 0x401FFF00, %g1
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mov %g1, %sp
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/* start RT-Thread Kernel */
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call rtthread_startup
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nop
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/*
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l0 = psr
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l1 = pc
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l2 = npc
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l3 = tbr
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*/
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.globl _ISR_Handler
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_ISR_Handler:
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mov %g4, %l4
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mov %g5, %l5
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mov %wim, %g4
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srl %g4, %l0, %g5
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cmp %g5, 1
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bne dont_do_the_window
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nop
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srl %g4, 1, %g5
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sll %g4, NWINDOWS - 1, %g4
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or %g4, %g5, %g4
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save
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mov %g4, %wim
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nop
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nop
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nop
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std %l0, [%sp + 0x00]
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std %l2, [%sp + 0x08]
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std %l4, [%sp + 0x10]
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std %l6, [%sp + 0x18]
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std %i0, [%sp + 0x20]
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std %i2, [%sp + 0x28]
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std %i4, [%sp + 0x30]
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std %i6, [%sp + 0x38]
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restore
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nop
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dont_do_the_window:
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sub %fp, CPU_INTERRUPT_FRAME_SIZE, %sp
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std %l0, [%sp + 0x60]
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st %l2, [%sp + 0x68]
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st %g1, [%sp + 0x6c]
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std %g2, [%sp + 0x70]
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std %l4, [%sp + 0x78]
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std %g6, [%sp + 0x80]
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std %i0, [%sp + 0x88]
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std %i2, [%sp + 0x90]
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std %i4, [%sp + 0x98]
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std %i6, [%sp + 0xA0]
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mov %y, %g1
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st %g1, [%sp + 0xA8]
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st %l6, [%sp + 0xAc]
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std %f0, [%sp + 0xB0 + 8 * 0x0]
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std %f2, [%sp + 0xB0 + 8 * 0x1]
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std %f4, [%sp + 0xB0 + 8 * 0x2]
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std %f6, [%sp + 0xB0 + 8 * 0x3]
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std %f8, [%sp + 0xB0 + 8 * 0x4]
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std %f10, [%sp + 0xB0 + 8 * 0x5]
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std %f12, [%sp + 0xB0 + 8 * 0x6]
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std %f14, [%sp + 0xB0 + 8 * 0x7]
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std %f16, [%sp + 0xB0 + 8 * 0x8]
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std %f18, [%sp + 0xB0 + 8 * 0x9]
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std %f20, [%sp + 0xB0 + 8 * 0xA]
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std %f22, [%sp + 0xB0 + 8 * 0xB]
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std %f24, [%sp + 0xB0 + 8 * 0xC]
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std %f26, [%sp + 0xB0 + 8 * 0xD]
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std %f28, [%sp + 0xB0 + 8 * 0xE]
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std %f30, [%sp + 0xB0 + 8 * 0xF]
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st %fsr, [%sp + 0xB0 + 8 * 0x10]
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mov %l0, %g5
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or %g5, SPARC_PSR_PIL_MASK, %g5
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wr %g5, SPARC_PSR_ET_MASK, %psr
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nop
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nop
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nop
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call rt_interrupt_enter
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nop
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and %l3, 0x0FF0, %l3
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srl %l3, 4, %o0
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mov %sp, %o1
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call rt_hw_trap
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nop
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call rt_interrupt_leave
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nop
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mov %l0, %psr
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nop
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nop
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nop
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ld [%sp + 0xA8], %l5
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mov %l5, %y
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ldd [%sp + 0x60], %l0
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ld [%sp + 0x68], %l2
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ld [%sp + 0x6c], %g1
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ldd [%sp + 0x70], %g2
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ldd [%sp + 0x78], %g4
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ldd [%sp + 0x80], %g6
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ldd [%sp + 0x88], %i0
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ldd [%sp + 0x90], %i2
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ldd [%sp + 0x98], %i4
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ldd [%sp + 0xA0], %i6
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ldd [%sp + 0xB0 + 8 * 0x0], %f0
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ldd [%sp + 0xB0 + 8 * 0x1], %f2
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ldd [%sp + 0xB0 + 8 * 0x2], %f4
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ldd [%sp + 0xB0 + 8 * 0x3], %f6
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ldd [%sp + 0xB0 + 8 * 0x4], %f8
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ldd [%sp + 0xB0 + 8 * 0x5], %f10
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ldd [%sp + 0xB0 + 8 * 0x6], %f12
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ldd [%sp + 0xB0 + 8 * 0x7], %f14
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ldd [%sp + 0xB0 + 8 * 0x8], %f16
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ldd [%sp + 0xB0 + 8 * 0x9], %f18
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ldd [%sp + 0xB0 + 8 * 0xA], %f20
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ldd [%sp + 0xB0 + 8 * 0xB], %f22
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ldd [%sp + 0xB0 + 8 * 0xC], %f24
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ldd [%sp + 0xB0 + 8 * 0xD], %f26
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ldd [%sp + 0xB0 + 8 * 0xE], %f28
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ldd [%sp + 0xB0 + 8 * 0xF], %f30
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ld [%sp + 0xB0 + 8 * 0x10], %fsr
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nop
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nop
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nop
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mov %wim, %l4
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add %l0, 1, %l6
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and %l6, SPARC_PSR_CWP_MASK, %l6
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srl %l4, %l6, %l5
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cmp %l5, 1
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bne good_task_window
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nop
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sll %l4, 1, %l5
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srl %l4, NWINDOWS - 1, %l4
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or %l4, %l5, %l4
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mov %l4, %wim
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nop
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nop
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nop
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restore
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ldd [%sp + 0], %l0 ! Restore window from the stack
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ldd [%sp + 8], %l2
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ldd [%sp + 16], %l4
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ldd [%sp + 24], %l6
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ldd [%sp + 32], %i0
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ldd [%sp + 40], %i2
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ldd [%sp + 48], %i4
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ldd [%sp + 56], %i6
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save
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good_task_window:
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set rt_thread_switch_interrupt_flag, %l4
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ld [%l4], %l5
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cmp %l5, 1
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be rt_hw_context_switch_interrupt_do
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nop
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mov %l0, %psr
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nop
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nop
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nop
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jmp %l1
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rett %l2
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rt_hw_context_switch_interrupt_do:
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st %g0, [%l4]
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sub %fp, 0x20, %sp
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std %g0, [%sp + 0x00]
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std %g2, [%sp + 0x08]
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std %g4, [%sp + 0x10]
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std %g6, [%sp + 0x18]
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mov %sp, %g3
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mov %l1, %g4
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mov %l2, %g5
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mov %l0, %g6
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mov %wim, %g7
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mov %g0, %wim
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nop
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nop
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nop
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set 0xFFFFFFF8, %g1
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and %g1, %g6, %g1
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mov %g1, %psr
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nop
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nop
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nop
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mov %g0, %g1
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save_loop:
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save
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sub %g3, 0x40, %g3
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std %l0, [%g3 + 0x00]
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std %l2, [%g3 + 0x08]
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std %l4, [%g3 + 0x10]
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std %l6, [%g3 + 0x18]
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std %i0, [%g3 + 0x20]
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std %i2, [%g3 + 0x28]
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std %i4, [%g3 + 0x30]
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std %i6, [%g3 + 0x38]
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inc %g1
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cmp %g1, NWINDOWS
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bne save_loop
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nop
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sub %g3, 0x88, %g3
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std %f0, [%g3 + 0x00]
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std %f2, [%g3 + 0x08]
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std %f4, [%g3 + 0x10]
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std %f6, [%g3 + 0x18]
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std %f8, [%g3 + 0x20]
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std %f10, [%g3 + 0x28]
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std %f12, [%g3 + 0x30]
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std %f14, [%g3 + 0x38]
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std %f16, [%g3 + 0x40]
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std %f18, [%g3 + 0x48]
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std %f20, [%g3 + 0x50]
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std %f22, [%g3 + 0x58]
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std %f24, [%g3 + 0x60]
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std %f26, [%g3 + 0x68]
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std %f28, [%g3 + 0x70]
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std %f30, [%g3 + 0x78]
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mov %y, %g1
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st %g1, [%g3 + 0x80]
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st %fsr, [%g3 + 0x84]
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sub %g3, 0x10, %g3
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std %g4, [%g3 + 0x00]
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std %g6, [%g3 + 0x08]
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set rt_interrupt_from_thread, %g1
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ld [%g1], %g2
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st %g3, [%g2]
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set rt_interrupt_to_thread, %g1
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ld [%g1], %g1
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ld [%g1], %g3
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ldd [%g3 + 0x00], %g4
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ldd [%g3 + 0x08], %g6
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add %g3, 0x10, %g3
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ldd [%g3 + 0x00], %f0
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ldd [%g3 + 0x08], %f2
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ldd [%g3 + 0x10], %f4
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ldd [%g3 + 0x18], %f6
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ldd [%g3 + 0x20], %f8
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ldd [%g3 + 0x28], %f10
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ldd [%g3 + 0x30], %f12
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ldd [%g3 + 0x38], %f14
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ldd [%g3 + 0x40], %f16
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ldd [%g3 + 0x48], %f18
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ldd [%g3 + 0x50], %f20
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ldd [%g3 + 0x58], %f22
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ldd [%g3 + 0x60], %f24
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ldd [%g3 + 0x68], %f26
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ldd [%g3 + 0x70], %f28
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ldd [%g3 + 0x78], %f30
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ld [%g3 + 0x80], %g1
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mov %g1, %y
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ld [%g3 + 0x84], %fsr
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add %g3, 0x88, %g3
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set NWINDOWS - 1, %g1
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or %g1, %g6, %g1
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mov %g1, %psr
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nop
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nop
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nop
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mov %g0, %g1
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restore_loop:
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restore
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ldd [%g3 + 0x00], %l0
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ldd [%g3 + 0x08], %l2
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ldd [%g3 + 0x10], %l4
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ldd [%g3 + 0x18], %l6
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ldd [%g3 + 0x20], %i0
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ldd [%g3 + 0x28], %i2
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ldd [%g3 + 0x30], %i4
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ldd [%g3 + 0x38], %i6
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add %g3, 0x40, %g3
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inc %g1
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cmp %g1, NWINDOWS
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bne restore_loop
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nop
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mov %g6, %psr
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nop
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nop
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nop
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mov %g7, %wim
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nop
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nop
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nop
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mov %g4, %l1
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mov %g5, %l2
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mov %g3, %sp
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ldd [%sp + 0x00], %g0
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ldd [%sp + 0x08], %g2
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ldd [%sp + 0x10], %g4
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ldd [%sp + 0x18], %g6
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add %sp, 0x20, %fp
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jmp %l1
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rett %l2
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/*
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l0 = psr
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l1 = pc
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l2 = npc
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l3 = tbr
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*/
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_context_switch:
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mov %l2, %l1
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add %l2, 4, %l2
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mov %g4, %l4
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mov %g5, %l5
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mov %wim, %g4
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srl %g4, %l0, %g5
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cmp %g5, 1
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bne good_window
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nop
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srl %g4, 1, %g5
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sll %g4, NWINDOWS - 1, %g4
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or %g4, %g5, %g4
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save
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mov %g4, %wim
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nop
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nop
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nop
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std %l0, [%sp + 0x00]
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std %l2, [%sp + 0x08]
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std %l4, [%sp + 0x10]
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std %l6, [%sp + 0x18]
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std %i0, [%sp + 0x20]
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std %i2, [%sp + 0x28]
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std %i4, [%sp + 0x30]
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std %i6, [%sp + 0x38]
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restore
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nop
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good_window:
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and %l3, 0x0FF0, %l3
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srl %l3, 4, %l4
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cmp %l4, 0x82
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bne switch_to
|
|
nop
|
|
|
|
sub %fp, 0x20, %sp
|
|
std %g0, [%sp + 0x00]
|
|
std %g2, [%sp + 0x08]
|
|
std %g4, [%sp + 0x10]
|
|
std %g6, [%sp + 0x18]
|
|
|
|
mov %sp, %g3
|
|
mov %l1, %g4
|
|
mov %l2, %g5
|
|
mov %l0, %g6
|
|
mov %wim, %g7
|
|
|
|
mov %g0, %wim
|
|
nop
|
|
nop
|
|
nop
|
|
set 0xFFFFFFF8, %g1
|
|
and %g1, %g6, %g1
|
|
mov %g1, %psr
|
|
nop
|
|
nop
|
|
nop
|
|
|
|
mov %g0, %g1
|
|
save_window:
|
|
save
|
|
sub %g3, 0x40, %g3
|
|
std %l0, [%g3 + 0x00]
|
|
std %l2, [%g3 + 0x08]
|
|
std %l4, [%g3 + 0x10]
|
|
std %l6, [%g3 + 0x18]
|
|
std %i0, [%g3 + 0x20]
|
|
std %i2, [%g3 + 0x28]
|
|
std %i4, [%g3 + 0x30]
|
|
std %i6, [%g3 + 0x38]
|
|
inc %g1
|
|
cmp %g1, NWINDOWS
|
|
bne save_window
|
|
nop
|
|
|
|
sub %g3, 0x88, %g3
|
|
std %f0, [%g3 + 0x00]
|
|
std %f2, [%g3 + 0x08]
|
|
std %f4, [%g3 + 0x10]
|
|
std %f6, [%g3 + 0x18]
|
|
std %f8, [%g3 + 0x20]
|
|
std %f10, [%g3 + 0x28]
|
|
std %f12, [%g3 + 0x30]
|
|
std %f14, [%g3 + 0x38]
|
|
std %f16, [%g3 + 0x40]
|
|
std %f18, [%g3 + 0x48]
|
|
std %f20, [%g3 + 0x50]
|
|
std %f22, [%g3 + 0x58]
|
|
std %f24, [%g3 + 0x60]
|
|
std %f26, [%g3 + 0x68]
|
|
std %f28, [%g3 + 0x70]
|
|
std %f30, [%g3 + 0x78]
|
|
mov %y, %g1
|
|
st %g1, [%g3 + 0x80]
|
|
st %fsr, [%g3 + 0x84]
|
|
|
|
sub %g3, 0x10, %g3
|
|
std %g4, [%g3 + 0x00]
|
|
std %g6, [%g3 + 0x08]
|
|
|
|
mov %g6, %psr
|
|
nop
|
|
nop
|
|
nop
|
|
|
|
st %g3, [%i0]
|
|
switch_to:
|
|
mov %g0, %wim
|
|
nop
|
|
nop
|
|
nop
|
|
ld [%i1], %g3
|
|
|
|
ldd [%g3 + 0x00], %g4
|
|
ldd [%g3 + 0x08], %g6
|
|
add %g3, 0x10, %g3
|
|
|
|
ldd [%g3 + 0x00], %f0
|
|
ldd [%g3 + 0x08], %f2
|
|
ldd [%g3 + 0x10], %f4
|
|
ldd [%g3 + 0x18], %f6
|
|
ldd [%g3 + 0x20], %f8
|
|
ldd [%g3 + 0x28], %f10
|
|
ldd [%g3 + 0x30], %f12
|
|
ldd [%g3 + 0x38], %f14
|
|
ldd [%g3 + 0x40], %f16
|
|
ldd [%g3 + 0x48], %f18
|
|
ldd [%g3 + 0x50], %f20
|
|
ldd [%g3 + 0x58], %f22
|
|
ldd [%g3 + 0x60], %f24
|
|
ldd [%g3 + 0x68], %f26
|
|
ldd [%g3 + 0x70], %f28
|
|
ldd [%g3 + 0x78], %f30
|
|
ld [%g3 + 0x80], %g1
|
|
mov %g1, %y
|
|
ld [%g3 + 0x84], %fsr
|
|
add %g3, 0x88, %g3
|
|
|
|
set NWINDOWS - 1, %g1
|
|
or %g1, %g6, %g1
|
|
mov %g1, %psr
|
|
nop
|
|
nop
|
|
nop
|
|
|
|
mov %g0, %g1
|
|
restore_window:
|
|
restore
|
|
ldd [%g3 + 0x00], %l0
|
|
ldd [%g3 + 0x08], %l2
|
|
ldd [%g3 + 0x10], %l4
|
|
ldd [%g3 + 0x18], %l6
|
|
ldd [%g3 + 0x20], %i0
|
|
ldd [%g3 + 0x28], %i2
|
|
ldd [%g3 + 0x30], %i4
|
|
ldd [%g3 + 0x38], %i6
|
|
add %g3, 0x40, %g3
|
|
inc %g1
|
|
cmp %g1, NWINDOWS
|
|
bne restore_window
|
|
nop
|
|
|
|
mov %g6, %psr
|
|
nop
|
|
nop
|
|
nop
|
|
mov %g7, %wim
|
|
nop
|
|
nop
|
|
nop
|
|
|
|
mov %g4, %l1
|
|
mov %g5, %l2
|
|
mov %g3, %sp
|
|
|
|
ldd [%sp + 0x00], %g0
|
|
ldd [%sp + 0x08], %g2
|
|
ldd [%sp + 0x10], %g4
|
|
ldd [%sp + 0x18], %g6
|
|
add %sp, 0x20, %fp
|
|
jmp %l1
|
|
rett %l2
|
|
|
|
.data
|
|
.align 8
|
|
_fpdata:
|
|
.word 0, 0
|
|
_fsrinit:
|
|
.word 0
|