Arm Community
Site
Search
User
Site
Search
User
Groups
Arm Research
DesignStart
Education Hub
Graphics and Gaming
High Performance Computing
Innovation
Multimedia
Open Source Software and Platforms
Physical
Processors
Security
System
Software Tools
TrustZone for Armv8-M
中文社区
Blog
Announcements
Artificial Intelligence
Automotive
Healthcare
HPC
Infrastructure
Innovation
Internet of Things
Machine Learning
Mobile
Smart Homes
Wearables
Forums
All developer forums
IP Product forums
Tool & Software forums
Support
Open a support case
Documentation
Downloads
Training
Arm Approved program
Arm Design Reviews
Community Help
More
Cancel
Developer Community
Tools and Software
Software Tools
Jump...
Cancel
Software Tools
Arm Development Studio forum
armcc problem?
Tools, Software and IDEs blog
Forums
Videos & Files
Help
Jump...
Cancel
New
Replies
4 replies
Subscribers
126 subscribers
Views
2899 views
Users
0 members are here
Related
armcc problem?
Offline
Ric Peregrino
over 7 years ago
Note: This was originally posted on 20th April 2009 at http://forums.arm.com
Hello,
We're using armcc here version:
ARM/Thumb C/C++ Compiler, RVCT3.1 [Build 739]
And it seems to have an issue. Here's some simple c-code:
main () {
volatile unsigned int tmp32;
printf ("GPIO: 1_reset: before\n");
// touch tb_gpio
*(unsigned int *)(0x50000004) = 0x12345678;
tmp32 = *((volatile unsigned int *)(0x50000004));
printf ("GPIO: tmp32 = 0x%0x\n", tmp32);
printf ("GPIO: tmp32 = 0x%0x\n", tmp32);
if (tmp32 != 0x12345678) printf("FAIL: 1st tb_gpio WRV failed!\n");
Here's the resulting output:
# GPIO: 1_reset: before
# GPIO: tmp32 = 0x12345678
# GPIO: tmp32 = 0x0
# FAIL: 1st tb_gpio WRV failed!
Why is the 2nd printf of tmp32 different? Here's the disassembled code, and it seems that the first printf is printing not tmp32 which is in r4, but the literal that was written, which is in r6:
0x00040082: 4e2b +N LDR r6,[pc,#172] ; [0x40130] = 0x12345678
0x00040084: f04f45a0 O..E MOV r5,#0x50000000
0x00040088: 606e n` STR r6,[r5,#4]
0x0004008a: 686c lh LDR r4,[r5,#4]
0x0004008c: 4631 1F MOV r1,r6
0x0004008e: a029 ). ADR r0,{pc}+0xa6 ; 0x40134
0x00040090: f000fcf6 .... BL __0printf ; 0x40a80
0x00040094: 4621 !F MOV r1,r4
0x00040096: a027 '. ADR r0,{pc}+0x9e ; 0x40134
0x00040098: f000fcf2 .... BL __0printf ; 0x40a80
This make sense? Is this an armcc bug? If so, what next?
Cheers,
Ric Peregrino
Dust Networks
More questions in this forum
By title
By date
By reply count
By view count
By most asked
By votes
By quality
Descending
Ascending
All recent questions
Unread questions
Questions you've participated in
Questions you've asked
Unanswered questions
Answered questions
Questions with suggested answers
Questions with no replies
Not Answered
freeRTOS demo DS-5 ERROR(CMD360) when trying to debug
+1
12208
views
12
replies
Latest
4 months ago
by
tolc
Answered
ubuntu - How to uninstall Arm Development studio and all its requirements
0
Arm Development Studio
8165
views
1
reply
Latest
4 months ago
by
Jonathan Simmonds
Answered
DSTREAM Probe damage - Spare parts?
0
DSTREAM
10412
views
2
replies
Latest
4 months ago
by
SamGKN
Suggested Answer
Optimized ARM version of memcmp
0
8966
views
3
replies
Latest
4 months ago
by
Ronan Synnott
Not Answered
Develop Kotlin apps with OpenCl to run in a Samsung mobile that use Mali G71
0
8029
views
2
replies
Latest
4 months ago
by
ARMStrongssen
<
>
View all questions in Arm Development Studio forum