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// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#if defined(__arm__)
#define YARN_BUILD_ASM 1
#include "OSFiber_asm_arm.h"
// void yarn_fiber_swap(yarn_fiber_context* from, const yarn_fiber_context* to)
// x0: from
// x1: to
.text
.global yarn_fiber_swap
.align 4
yarn_fiber_swap:
// Save context 'from'
// TODO: multiple registers can be stored in a single instruction with: stm rA, {rB-rC}
// Store special purpose registers
str r12, [r0, #YARN_REG_r12]
// Store callee-preserved registers
str r4, [r0, #YARN_REG_r4]
str r5, [r0, #YARN_REG_r5]
str r6, [r0, #YARN_REG_r6]
str r7, [r0, #YARN_REG_r7]
str r8, [r0, #YARN_REG_r8]
str r9, [r0, #YARN_REG_r9]
str r10, [r0, #YARN_REG_r10]
str r11, [r0, #YARN_REG_r11]
// Store sp, lr and pc
str sp, [r0, #YARN_REG_SP]
str lr, [r0, #YARN_REG_LR]
// Load context 'to'
// TODO: multiple registers can be loaded in a single instruction with: ldm rA, {rB-rC}
mov r3, r1
// Load special purpose registers
ldr r12, [r3, #YARN_REG_r12]
// Load callee-preserved registers
ldr r4, [r3, #YARN_REG_r4]
ldr r5, [r3, #YARN_REG_r5]
ldr r6, [r3, #YARN_REG_r6]
ldr r7, [r3, #YARN_REG_r7]
ldr r8, [r3, #YARN_REG_r8]
ldr r9, [r3, #YARN_REG_r9]
ldr r10, [r3, #YARN_REG_r10]
ldr r11, [r3, #YARN_REG_r11]
// Load parameter registers
ldr r0, [r3, #YARN_REG_r0]
ldr r1, [r3, #YARN_REG_r1]
// Load sp, lr and pc
ldr sp, [r3, #YARN_REG_SP]
ldr lr, [r3, #YARN_REG_LR]
mov pc, lr
#endif // defined(__arm__)