rtos_mqx_stackings.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2014 by Marian Cingel                                   *
 *   cingel.marian@gmail.com                                               *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "rtos.h"
#include "target/armv7m.h"
 
 
/*
 * standard exception stack
 * ( stack base, higher memory address )
 * - xpsr       - 0x48
 * - pc         - 0x44
 * - lr         - 0x40
 * - r12        - 0x3C
 * - r3         - 0x38
 * - r2         - 0x34
 * - r1         - 0x30
 * - r0         - 0x2C
 * extended stack in svc_pending handler
 * - lr         - 0x28
 * - r11        - 0x24
 * - r10        - 0x20
 * - r9         - 0x1C
 * - r8         - 0x18
 * - r7         - 0x14
 * - r6         - 0x10
 * - r5         - 0x0C
 * - r4         - 0x08
 * - BASEPRI    - 0x04
 * - SHPR3      - 0x00 ( contains pend_svc exception priority )
 * ( stack head, lower address, stored in 'task->STACK_PTR' )
 */
 
static const struct stack_register_offset rtos_mqx_arm_v7m_stack_offsets[ARMV7M_NUM_CORE_REGS] = {
    { ARMV7M_R0,   0x2C, 32 }, /* r0   */
    { ARMV7M_R1,   0x30, 32 }, /* r1   */
    { ARMV7M_R2,   0x34, 32 }, /* r2   */
    { ARMV7M_R3,   0x38, 32 }, /* r3   */
    { ARMV7M_R4,   0x08, 32 }, /* r4   */
    { ARMV7M_R5,   0x0C, 32 }, /* r5   */
    { ARMV7M_R6,   0x10, 32 }, /* r6   */
    { ARMV7M_R7,   0x14, 32 }, /* r7   */
    { ARMV7M_R8,   0x18, 32 }, /* r8   */
    { ARMV7M_R9,   0x1C, 32 }, /* r9   */
    { ARMV7M_R10,  0x20, 32 }, /* r10  */
    { ARMV7M_R11,  0x24, 32 }, /* r11  */
    { ARMV7M_R12,  0x3C, 32 }, /* r12  */
    { ARMV7M_R13,    -2, 32 }, /* sp   */
    { ARMV7M_R14,  0x28, 32 }, /* lr   */
    { ARMV7M_PC,   0x44, 32 }, /* pc   */
    { ARMV7M_XPSR, 0x48, 32 }, /* xPSR */
};
 
const struct rtos_register_stacking rtos_mqx_arm_v7m_stacking = {
    .stack_registers_size = 0x4C,                   /* calculate offset base address */
    .stack_growth_direction = -1,
    .num_output_registers = ARMV7M_NUM_CORE_REGS,
    .register_offsets = rtos_mqx_arm_v7m_stack_offsets
};