📄 os_task.lst
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##############################################################################
# #
# IAR ARM ANSI C/C++ Compiler V4.42A/W32 EVALUATION 12/Dec/2008 17:14:26 #
# Copyright 1999-2005 IAR Systems. All rights reserved. #
# #
# Cpu mode = arm #
# Endian = little #
# Stack alignment = 4 #
# Source file = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\UCOS-II\uCOS-II #
# \Source\os_task.c #
# Command line = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\UCOS-II\uCOS-II #
# \Source\os_task.c -lCN E:\IAR_2478\IAR_2478\26uCOS\S #
# rc\uCOS\RAM_Debug\List\ -o #
# E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\RAM_Debug\Obj\ #
# -z2 --no_cse --no_unroll --no_inline #
# --no_code_motion --no_tbaa --no_clustering #
# --no_scheduling --debug --cpu_mode arm --endian #
# little --cpu ARM7TDMI-S --stack_align 4 -e --fpu #
# None --dlib_config "C:\Program Files\IAR #
# Systems\Embedded Workbench 4.0 #
# Evaluation\arm\LIB\dl4tpannl8n.h" -I #
# E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\include\ -I #
# E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\ucos-ii\include #
# \ -I "C:\Program Files\IAR Systems\Embedded #
# Workbench 4.0 Evaluation\arm\INC\" #
# List file = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\RAM_Debug\List\ #
# os_task.lst #
# Object file = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\RAM_Debug\Obj\o #
# s_task.r79 #
# #
# #
##############################################################################
E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\UCOS-II\uCOS-II\Source\os_task.c
1 /*
2 *********************************************************************************************************
3 * uC/OS-II
4 * The Real-Time Kernel
5 * TASK MANAGEMENT
6 *
7 * (c) Copyright 1992-2007, Jean J. Labrosse, Weston, FL
8 * All Rights Reserved
9 *
10 * File : OS_TASK.C
11 * By : Jean J. Labrosse
12 * Version : V2.84
13 *
14 * LICENSING TERMS:
15 * ---------------
16 * uC/OS-II is provided in source form for FREE evaluation, for educational use or for peaceful research.
17 * If you plan on using uC/OS-II in a commercial product you need to contact Micri祄 to properly license
18 * its use in your product. We provide ALL the source code for your convenience and to help you experience
19 * uC/OS-II. The fact that the source is provided does NOT mean that you can use it without paying a
20 * licensing fee.
21 *********************************************************************************************************
22 */
23
24 #ifndef OS_MASTER_FILE
25 #include <ucos_ii.h>
26 #endif
27
28 /*$PAGE*/
29 /*
30 *********************************************************************************************************
31 * CHANGE PRIORITY OF A TASK
32 *
33 * Description: This function allows you to change the priority of a task dynamically. Note that the new
34 * priority MUST be available.
35 *
36 * Arguments : oldp is the old priority
37 *
38 * newp is the new priority
39 *
40 * Returns : OS_ERR_NONE is the call was successful
41 * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
42 * (i.e. >= OS_LOWEST_PRIO)
43 * OS_ERR_PRIO_EXIST if the new priority already exist.
44 * OS_ERR_PRIO there is no task with the specified OLD priority (i.e. the OLD task does
45 * not exist.
46 * OS_ERR_TASK_NOT_EXIST if the task is assigned to a Mutex PIP.
47 *********************************************************************************************************
48 */
49
50 #if OS_TASK_CHANGE_PRIO_EN > 0
\ In segment CODE, align 4, keep-with-next
51 INT8U OSTaskChangePrio (INT8U oldprio, INT8U newprio)
52 {
\ OSTaskChangePrio:
\ 00000000 F04F2DE9 PUSH {R4-R11,LR}
\ 00000004 04D04DE2 SUB SP,SP,#+4
\ 00000008 0040B0E1 MOVS R4,R0
\ 0000000C 0150B0E1 MOVS R5,R1
53 #if OS_EVENT_EN
54 OS_EVENT *pevent;
55 #endif
56 OS_TCB *ptcb;
57 INT8U x;
58 INT8U y;
59 #if OS_LOWEST_PRIO <= 63
60 INT8U bitx;
61 INT8U bity;
62 #else
63 INT16U bitx;
64 INT16U bity;
65 #endif
66 INT8U y_old;
67 #if OS_CRITICAL_METHOD == 3
68 OS_CPU_SR cpu_sr = 0; /* Storage for CPU status register */
\ 00000010 0000A0E3 MOV R0,#+0
\ 00000014 00B0B0E1 MOVS R11,R0
69 #endif
70
71
72
73 #if OS_ARG_CHK_EN > 0
74 if (oldprio >= OS_LOWEST_PRIO) {
\ 00000018 1F0054E3 CMP R4,#+31
\ 0000001C 0300003A BCC ??OSTaskChangePrio_0
75 if (oldprio != OS_PRIO_SELF) {
\ 00000020 FF0054E3 CMP R4,#+255
\ 00000024 0100000A BEQ ??OSTaskChangePrio_0
76 return (OS_ERR_PRIO_INVALID);
\ 00000028 2A00A0E3 MOV R0,#+42
\ 0000002C 9A0000EA B ??OSTaskChangePrio_1
77 }
78 }
79 if (newprio >= OS_LOWEST_PRIO) {
\ ??OSTaskChangePrio_0:
\ 00000030 1F0055E3 CMP R5,#+31
\ 00000034 0100003A BCC ??OSTaskChangePrio_2
80 return (OS_ERR_PRIO_INVALID);
\ 00000038 2A00A0E3 MOV R0,#+42
\ 0000003C 960000EA B ??OSTaskChangePrio_1
81 }
82 #endif
83 OS_ENTER_CRITICAL();
\ ??OSTaskChangePrio_2:
\ 00000040 ........ _BLF OS_CPU_SR_Save,??OS_CPU_SR_Save??rA
\ 00000044 00B0B0E1 MOVS R11,R0
84 if (OSTCBPrioTbl[newprio] != (OS_TCB *)0) { /* New priority must not already exist */
\ 00000048 0500B0E1 MOVS R0,R5
\ 0000004C 0410A0E3 MOV R1,#+4
\ 00000050 ........ LDR R2,??DataTable52 ;; OSTCBPrioTbl
\ 00000054 912020E0 MLA R0,R1,R0,R2
\ 00000058 000090E5 LDR R0,[R0, #+0]
\ 0000005C 000050E3 CMP R0,#+0
\ 00000060 0300000A BEQ ??OSTaskChangePrio_3
85 OS_EXIT_CRITICAL();
\ 00000064 0B00B0E1 MOVS R0,R11
\ 00000068 ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rA
86 return (OS_ERR_PRIO_EXIST);
\ 0000006C 2800A0E3 MOV R0,#+40
\ 00000070 890000EA B ??OSTaskChangePrio_1
87 }
88 if (oldprio == OS_PRIO_SELF) { /* See if changing self */
\ ??OSTaskChangePrio_3:
\ 00000074 FF0054E3 CMP R4,#+255
\ 00000078 0300001A BNE ??OSTaskChangePrio_4
89 oldprio = OSTCBCur->OSTCBPrio; /* Yes, get priority */
\ 0000007C ........ LDR R0,??DataTable58 ;; OSTCBCur
\ 00000080 000090E5 LDR R0,[R0, #+0]
\ 00000084 2E00D0E5 LDRB R0,[R0, #+46]
\ 00000088 0040B0E1 MOVS R4,R0
90 }
91 ptcb = OSTCBPrioTbl[oldprio];
\ ??OSTaskChangePrio_4:
\ 0000008C 0400B0E1 MOVS R0,R4
\ 00000090 0410A0E3 MOV R1,#+4
\ 00000094 ........ LDR R2,??DataTable52 ;; OSTCBPrioTbl
\ 00000098 912020E0 MLA R0,R1,R0,R2
\ 0000009C 000090E5 LDR R0,[R0, #+0]
\ 000000A0 0070B0E1 MOVS R7,R0
92 if (ptcb == (OS_TCB *)0) { /* Does task to change exist? */
\ 000000A4 000057E3 CMP R7,#+0
\ 000000A8 0300001A BNE ??OSTaskChangePrio_5
93 OS_EXIT_CRITICAL(); /* No, can't change its priority! */
\ 000000AC 0B00B0E1 MOVS R0,R11
\ 000000B0 ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rA
94 return (OS_ERR_PRIO);
\ 000000B4 2900A0E3 MOV R0,#+41
\ 000000B8 770000EA B ??OSTaskChangePrio_1
95 }
96 if (ptcb == (OS_TCB *)1) { /* Is task assigned to Mutex */
\ ??OSTaskChangePrio_5:
\ 000000BC 010057E3 CMP R7,#+1
\ 000000C0 0300001A BNE ??OSTaskChangePrio_6
97 OS_EXIT_CRITICAL(); /* No, can't change its priority! */
\ 000000C4 0B00B0E1 MOVS R0,R11
\ 000000C8 ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rA
98 return (OS_ERR_TASK_NOT_EXIST);
\ 000000CC 4300A0E3 MOV R0,#+67
\ 000000D0 710000EA B ??OSTaskChangePrio_1
99 }
100 #if OS_LOWEST_PRIO <= 63
101 y = (INT8U)(newprio >> 3); /* Yes, compute new TCB fields */
\ ??OSTaskChangePrio_6:
\ 000000D4 FF5015E2 ANDS R5,R5,#0xFF ;; Zero extend
\ 000000D8 A501B0E1 LSRS R0,R5,#+3
\ 000000DC 0080B0E1 MOVS R8,R0
102 x = (INT8U)(newprio & 0x07);
\ 000000E0 071015E2 ANDS R1,R5,#0x7
\ 000000E4 0110CDE5 STRB R1,[SP, #+1]
103 bity = (INT8U)(1 << y);
\ 000000E8 0100A0E3 MOV R0,#+1
\ 000000EC 1008B0E1 LSLS R0,R0,R8
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