76 lines
2.1 KiB
ArmAsm
76 lines
2.1 KiB
ArmAsm
// Copyright 2019 The Marl Authors.
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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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// https://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 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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#if defined(__arm__)
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#define MARL_BUILD_ASM 1
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#include "osfiber_asm_arm.h"
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// void marl_fiber_swap(marl_fiber_context* from, const marl_fiber_context* to)
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// x0: from
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// x1: to
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.text
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.global marl_fiber_swap
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.align 4
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.type marl_fiber_swap, %function
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marl_fiber_swap:
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// Save context 'from'
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// TODO: multiple registers can be stored in a single instruction with: stm rA, {rB-rC}
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// Store special purpose registers
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str r12, [r0, #MARL_REG_r12]
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// Store callee-preserved registers
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str r4, [r0, #MARL_REG_r4]
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str r5, [r0, #MARL_REG_r5]
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str r6, [r0, #MARL_REG_r6]
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str r7, [r0, #MARL_REG_r7]
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str r8, [r0, #MARL_REG_r8]
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str r9, [r0, #MARL_REG_r9]
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str r10, [r0, #MARL_REG_r10]
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str r11, [r0, #MARL_REG_r11]
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// Store sp, lr and pc
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str sp, [r0, #MARL_REG_SP]
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str lr, [r0, #MARL_REG_LR]
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// Load context 'to'
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// TODO: multiple registers can be loaded in a single instruction with: ldm rA, {rB-rC}
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mov r3, r1
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// Load special purpose registers
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ldr r12, [r3, #MARL_REG_r12]
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// Load callee-preserved registers
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ldr r4, [r3, #MARL_REG_r4]
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ldr r5, [r3, #MARL_REG_r5]
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ldr r6, [r3, #MARL_REG_r6]
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ldr r7, [r3, #MARL_REG_r7]
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ldr r8, [r3, #MARL_REG_r8]
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ldr r9, [r3, #MARL_REG_r9]
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ldr r10, [r3, #MARL_REG_r10]
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ldr r11, [r3, #MARL_REG_r11]
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// Load parameter registers
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ldr r0, [r3, #MARL_REG_r0]
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ldr r1, [r3, #MARL_REG_r1]
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// Load sp, lr and pc
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ldr sp, [r3, #MARL_REG_SP]
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ldr lr, [r3, #MARL_REG_LR]
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mov pc, lr
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#endif // defined(__arm__)
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