ports/arc_hs/metaware/src/tx_thread_context_fast_save.s


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;/***************************************************************************
; * Copyright (c) 2024 Microsoft Corporation
; *
; * This program and the accompanying materials are made available under the
; * terms of the MIT License which is available at
; * https://opensource.org/licenses/MIT.
; *
; * SPDX-License-Identifier: MIT
; **************************************************************************/
;
;
;/**************************************************************************/
;/**************************************************************************/
;/**                                                                       */
;/** ThreadX Component                                                     */
;/**                                                                       */
;/**   Thread                                                              */
;/**                                                                       */
;/**************************************************************************/
;/**************************************************************************/
#ifdef TX_INCLUDE_USER_DEFINE_FILE
#include "tx_user.h"
#endif

;/**************************************************************************/
;/*                                                                        */
;/*  FUNCTION                                               RELEASE        */
;/*                                                                        */
;/*    _tx_thread_context_fast_save                      ARC_HS/MetaWare   */
;/*                                                           6.2.1        */
;/*  AUTHOR                                                                */
;/*                                                                        */
;/*    William E. Lamie, Microsoft Corporation                             */
;/*                                                                        */
;/*  DESCRIPTION                                                           */
;/*                                                                        */
;/*    This function saves the context of an executing thread in the       */
;/*    beginning of fast interrupt processing. The function assumes that   */
;/*    fast interrupts are enabled (priority 0) and multiple register      */
;/*    banks are available. In this case, register bank 1 is reserved by   */
;/*    hardware for fast interrupts. Additional assumptions include that   */
;/*    there will be no nested fast interrupts and the LP_START, LP_END,   */
;/*    and LP_COUNT registers are not used in the application's fast       */
;/*    interrupt ISR.                                                      */
;/*                                                                        */
;/*  INPUT                                                                 */
;/*                                                                        */
;/*    None                                                                */
;/*                                                                        */
;/*  OUTPUT                                                                */
;/*                                                                        */
;/*    None                                                                */
;/*                                                                        */
;/*  CALLS                                                                 */
;/*                                                                        */
;/*    None                                                                */
;/*                                                                        */
;/*  CALLED BY                                                             */
;/*                                                                        */
;/*    ISRs                                                                */
;/*                                                                        */
;/**************************************************************************/
;VOID   _tx_thread_context_fast_save(VOID)
;{
    .global _tx_thread_context_fast_save
    .type   _tx_thread_context_fast_save, @function
_tx_thread_context_fast_save:
;
;    /* Increment nested interrupt count.  */
;    _tx_thread_system_state++;
;
    ld      r0, [gp, _tx_thread_system_state@sda]       ; Pickup system state
    add     r0, r0, 1                                   ; Increment the nested interrupt count
    st      r0, [gp, _tx_thread_system_state@sda]       ; Update system state
;
;
    .ifdef TX_ENABLE_EXECUTION_CHANGE_NOTIFY
;
;    /* Call the ISR enter function to indicate an ISR is executing.  */
;
    sub     sp, sp, 32                                  ; Allocating some space on the stack
    st      blink, [sp, 16]                             ; Save blink
    bl.d    _tx_execution_isr_enter                     ; Call the ISR enter function
    nop                                                 ; Delay slot
    ld      blink, [sp, 16]                             ; Recover blink
    add     sp, sp, 32                                  ; Recover the stack space
    .endif
;

    j       [blink]                                     ; Return to the ISR
;
;}
    .end