context_frame.h

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/*
 * SPDX-FileCopyrightText: 2017, 2019 JP Bonn, Ken Rabold
 * SPDX-License-Identifier: LGPL-2.1-only
 */
 
#pragma once

 
#if !defined(__ASSEMBLER__)
#include <stdint.h>
#endif /* __ASSEMBLER__ */
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define REGSZ (__riscv_xlen / 8)    
 
#if __riscv_xlen == 64
#  define REG_L ld
#  define REG_S sd
#else
#  define REG_L lw
#  define REG_S sw
#endif
 
#if !defined(__ASSEMBLER__)

struct context_switch_frame {
    /* Callee saved registers */
    uintptr_t s0;                   
    uintptr_t s1;                   
    uintptr_t s2;                   
    uintptr_t s3;                   
    uintptr_t s4;                   
    uintptr_t s5;                   
    uintptr_t s6;                   
    uintptr_t s7;                   
    uintptr_t s8;                   
    uintptr_t s9;                   
    uintptr_t s10;                  
    uintptr_t s11;                  
    /* Caller saved registers */
    uintptr_t ra;                   
    uintptr_t t0;                   
    uintptr_t t1;                   
    uintptr_t t2;                   
    uintptr_t t3;                   
    uintptr_t t4;                   
    uintptr_t t5;                   
    uintptr_t t6;                   
    uintptr_t a0;                   
    uintptr_t a1;                   
    uintptr_t a2;                   
    uintptr_t a3;                   
    uintptr_t a4;                   
    uintptr_t a5;                   
    uintptr_t a6;                   
    uintptr_t a7;                   
    /* Saved PC for return from ISR */
    uintptr_t pc;                   
    uintptr_t pad[3];               
};
 
#endif /* __ASSEMBLER__ */

/* These values are checked for correctness in context_frame.c */
#define s0_OFFSET     (0 * REGSZ)
#define s1_OFFSET     (1 * REGSZ)
#define s2_OFFSET     (2 * REGSZ)
#define s3_OFFSET     (3 * REGSZ)
#define s4_OFFSET     (4 * REGSZ)
#define s5_OFFSET     (5 * REGSZ)
#define s6_OFFSET     (6 * REGSZ)
#define s7_OFFSET     (7 * REGSZ)
#define s8_OFFSET     (8 * REGSZ)
#define s9_OFFSET     (9 * REGSZ)
#define s10_OFFSET    (10 * REGSZ)
#define s11_OFFSET    (11 * REGSZ)
#define ra_OFFSET     (12 * REGSZ)
#define t0_OFFSET     (13 * REGSZ)
#define t1_OFFSET     (14 * REGSZ)
#define t2_OFFSET     (15 * REGSZ)
#define t3_OFFSET     (16 * REGSZ)
#define t4_OFFSET     (17 * REGSZ)
#define t5_OFFSET     (18 * REGSZ)
#define t6_OFFSET     (19 * REGSZ)
#define a0_OFFSET     (20 * REGSZ)
#define a1_OFFSET     (21 * REGSZ)
#define a2_OFFSET     (22 * REGSZ)
#define a3_OFFSET     (23 * REGSZ)
#define a4_OFFSET     (24 * REGSZ)
#define a5_OFFSET     (25 * REGSZ)
#define a6_OFFSET     (26 * REGSZ)
#define a7_OFFSET     (27 * REGSZ)
#define pc_OFFSET     (28 * REGSZ)
#define pad_OFFSET    (29 * REGSZ)

#define CONTEXT_FRAME_SIZE (pad_OFFSET + 3 * REGSZ)

#define SP_OFFSET_IN_THREAD 0
 
#ifdef __cplusplus
}
#endif