1;/**************************************************************************/ 2;/* */ 3;/* Copyright (c) Microsoft Corporation. All rights reserved. */ 4;/* */ 5;/* This software is licensed under the Microsoft Software License */ 6;/* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7;/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8;/* and in the root directory of this software. */ 9;/* */ 10;/**************************************************************************/ 11; 12; 13;/**************************************************************************/ 14;/**************************************************************************/ 15;/** */ 16;/** ThreadX Component */ 17;/** */ 18;/** Thread */ 19;/** */ 20;/**************************************************************************/ 21;/**************************************************************************/ 22 23 .text 24;/**************************************************************************/ 25;/* */ 26;/* FUNCTION RELEASE */ 27;/* */ 28;/* _tx_thread_stack_build RXv1/GNURX */ 29;/* 6.1.11 */ 30;/* AUTHOR */ 31;/* */ 32;/* William E. Lamie, Microsoft Corporation */ 33;/* */ 34;/* DESCRIPTION */ 35;/* */ 36;/* This function builds a stack frame on the supplied thread's stack. */ 37;/* The stack frame results in a fake interrupt return to the supplied */ 38;/* function pointer. */ 39;/* */ 40;/* INPUT */ 41;/* */ 42;/* thread_ptr Pointer to thread control blk */ 43;/* function_ptr Pointer to return function */ 44;/* */ 45;/* OUTPUT */ 46;/* */ 47;/* None */ 48;/* */ 49;/* CALLS */ 50;/* */ 51;/* None */ 52;/* */ 53;/* CALLED BY */ 54;/* */ 55;/* _tx_thread_create Create thread service */ 56;/* */ 57;/* RELEASE HISTORY */ 58;/* */ 59;/* DATE NAME DESCRIPTION */ 60;/* */ 61;/* 08-02-2021 William E. Lamie Initial Version 6.1.8 */ 62;/* 10-15-2021 William E. Lamie Modified comment(s), and */ 63;/* removed unnecessary stack */ 64;/* type placement, */ 65;/* resulting in version 6.1.9 */ 66;/* 01-31-2022 William E. Lamie Modified comment(s), */ 67;/* resulting in version 6.1.10 */ 68;/* 04-25-2022 William E. Lamie Modified comment(s), */ 69;/* resulting in version 6.1.11 */ 70;/* */ 71;/**************************************************************************/ 72;VOID _tx_thread_stack_build(TX_THREAD *thread_ptr, VOID (*function_ptr)(VOID)) 73;{ 74 .global __tx_thread_stack_build 75__tx_thread_stack_build: 76; 77; 78; /* Build an interrupt frame. The form of the fake interrupt stack 79; on the Renesas RX should look like the following after it is built: 80; 81; Stack Top: ACC0 82; R6 83; R7 84; R8 85; R9 86; R10 87; R11 88; R12 89; R13 90; FPSW 91; R14 92; R15 93; R3 94; R4 95; R5 96; R1 97; R2 98; PC 99; PSW 100 101; 102; Stack Bottom: (higher memory address) */ 103; 104 MOV.L 16[R1],R3 ; Pickup end of stack area 105 BCLR #0, R3 ; Mask for 4-byte alignment 106 BCLR #1, R3 107; 108; /* Build the stack frame. */ 109; 110 MOV.L #30000h, R4 111 MOV.L R4, [-R3] ; Initial PSW (SVC mode, U flag set) 112 MOV.L R2, [-R3] ; Initial PC 113 MOV.L #0, R4 114 MOV.L R4,[-R3] ; Initial R2 ... 115 MOV.L R4,[-R3] ; Initial R1 ... 116 MOV.L R4,[-R3] ; Initial R5 ... 117 MOV.L R4,[-R3] ; Initial R4 ... 118 MOV.L R4,[-R3] ; Initial R3 ... 119 MOV.L R4,[-R3] ; Initial R15 ... 120 MOV.L R4,[-R3] ; Initial R14 ... 121 MOV.L R4,[-R3] ; Initial R13 ... 122 MOV.L R4,[-R3] ; Initial R12 ... 123 MOV.L R4,[-R3] ; Initial R11 ... 124 MOV.L R4,[-R3] ; Initial R10 ... 125 MOV.L R4,[-R3] ; Initial R9 ... 126 MOV.L R4,[-R3] ; Initial R8 ... 127 MOV.L R4,[-R3] ; Initial R7 ... 128 MOV.L R4,[-R3] ; Initial R6 ... 129 130 MOV.L R4,[-R3] ; Accumulator 0 131 MOV.L R4,[-R3] 132 133; /* Setup stack pointer. */ 134; thread_ptr -> tx_thread_stack_ptr = R1; 135 MOV.L R3, 8[R1] 136 ; Store initial SP in thread control block 137 RTS 138 139;} 140 .end 141
