// 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.

#define YARN_REG_r0  0x00
#define YARN_REG_r1  0x04
#define YARN_REG_r12 0x08
#define YARN_REG_r4  0x0c
#define YARN_REG_r5  0x10
#define YARN_REG_r6  0x14
#define YARN_REG_r7  0x18
#define YARN_REG_r8  0x1c
#define YARN_REG_r9  0x20
#define YARN_REG_r10 0x24
#define YARN_REG_r11 0x28
#define YARN_REG_v8  0x2c
#define YARN_REG_v9  0x30
#define YARN_REG_v10 0x34
#define YARN_REG_v11 0x38
#define YARN_REG_v12 0x3c
#define YARN_REG_v13 0x40
#define YARN_REG_v14 0x44
#define YARN_REG_v15 0x48
#define YARN_REG_SP  0x4c
#define YARN_REG_LR  0x50

#ifndef BUILD_ASM
#include <stdint.h>

// Procedure Call Standard for the ARM 64-bit Architecture
// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf
struct yarn_fiber_context
{
    // parameter registers
    uintptr_t r0;
    uintptr_t r1;

    // special purpose registers
    uintptr_t r12; // Intra-Procedure-call

    // callee-saved registers
    uintptr_t r4;
    uintptr_t r5;
    uintptr_t r6;
    uintptr_t r7;
    uintptr_t r8;
    uintptr_t r9;
    uintptr_t r10;
    uintptr_t r11;

    uintptr_t v8;
    uintptr_t v9;
    uintptr_t v10;
    uintptr_t v11;
    uintptr_t v12;
    uintptr_t v13;
    uintptr_t v14;
    uintptr_t v15;

    uintptr_t SP; // stack pointer (r13)
    uintptr_t LR; // link register (r14)
};

#ifdef __cplusplus
#include <cstddef>
static_assert(offsetof(yarn_fiber_context, r0)  == YARN_REG_r0,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r1)  == YARN_REG_r1,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r12) == YARN_REG_r12, "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r4)  == YARN_REG_r4,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r5)  == YARN_REG_r5,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r6)  == YARN_REG_r6,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r7)  == YARN_REG_r7,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r8)  == YARN_REG_r8,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r9)  == YARN_REG_r9,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r10) == YARN_REG_r10, "Bad register offset");
static_assert(offsetof(yarn_fiber_context, r11) == YARN_REG_r11, "Bad register offset");
static_assert(offsetof(yarn_fiber_context, v8)  == YARN_REG_v8,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, v9)  == YARN_REG_v9,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, v10) == YARN_REG_v10, "Bad register offset");
static_assert(offsetof(yarn_fiber_context, v11) == YARN_REG_v11, "Bad register offset");
static_assert(offsetof(yarn_fiber_context, v12) == YARN_REG_v12, "Bad register offset");
static_assert(offsetof(yarn_fiber_context, v13) == YARN_REG_v13, "Bad register offset");
static_assert(offsetof(yarn_fiber_context, v14) == YARN_REG_v14, "Bad register offset");
static_assert(offsetof(yarn_fiber_context, v15) == YARN_REG_v15, "Bad register offset");
static_assert(offsetof(yarn_fiber_context, SP)  == YARN_REG_SP,  "Bad register offset");
static_assert(offsetof(yarn_fiber_context, LR)  == YARN_REG_LR,  "Bad register offset");
#endif // __cplusplus

#endif // BUILD_ASM