• Locked Locked
  • Replies 5 replies
  • Subscribers 119 subscribers
  • Views 4295 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Memory alignment while using LDR instruction in cortex A9

ANGEL MARY NATHAN
Note: This was originally posted on 3rd August 2012 at http://forums.arm.com

Hi,

I am facing some problem while trying to load a 32 bit value into a register by using LDR R0 [R1] where R1 is a pointer to a memory location having some value.
when i use the LDR instruction 3bytes are fetched from the location pointed by R1 and the 4th byte is 1byte before the loacation pointed by R1.
I am working on ARM Cortex A9 simulator.
Is it anything related to memory alignment?
How do i solve this?

Thanks in advance
Angel
Parents
  • Note: This was originally posted on 6th August 2012 at http://forums.arm.com

    HI ttfn,

    The value of R1(pointer) is 0x403023cd.
    Im using CCS V5, In the properties i have chosen cortex R4.

    The memory looks like

    address     0x403023cc   0x403023cd             0x403023ce               0x403023cf                 0x403023d0               

    value                  0x4E                   0X4D                      0X4C                         0X4B                          0X48    

    R1 is pointing to 0x403023cd
    when I try loading LDR R0,[R1], the value i get in R1 IS 4E4B4C4D.
    How do i solve this?
Reply
  • Note: This was originally posted on 6th August 2012 at http://forums.arm.com

    HI ttfn,

    The value of R1(pointer) is 0x403023cd.
    Im using CCS V5, In the properties i have chosen cortex R4.

    The memory looks like

    address     0x403023cc   0x403023cd             0x403023ce               0x403023cf                 0x403023d0               

    value                  0x4E                   0X4D                      0X4C                         0X4B                          0X48    

    R1 is pointing to 0x403023cd
    when I try loading LDR R0,[R1], the value i get in R1 IS 4E4B4C4D.
    How do i solve this?
Children
No data