LinuxPPC-Dev Archive on lore.kernel.org
 help / color / mirror / Atom feed
From: "enorm" <enorm@126.com>
To: <linuxppc-embedded@ozlabs.org>
Subject: MPC85xx u-boot definition
Date: Tue, 29 Aug 2006 09:54:46 +0800	[thread overview]
Message-ID: <017001c6cb0e$1b81f440$a309a8c0@SZD823> (raw)

[-- Attachment #1: Type: text/plain, Size: 966 bytes --]

Hi,
  Some naive questions about u-boot for MPC85xx,  the definition of 
some macro in ppc_asm.tmpl. Can anyone there explain them to me please? 

 1)   In GET_GOT(x) what does  " lwz r0,0b-1b(r14) ;" do? what does 
"0b-1b" stands for, or the meaning of the syntax? why move the content 
of the memory pointing by LR? 



#define GET_GOT                                \ 
        bl      1f              ;       \ 
       .text   2               ;       \ 
 0:     .long   .LCTOC1-1f      ;       \ 
       .text                   ;       \ 
1:      mflr    r14             ;       \ 
       lwz     r0,0b-1b(r14)   ;       \ 
       add     r14,r0,r14      ; 


2) In START_GOT,  any special meaning for the value 32768? 
 >> .LCTOC1=.+32768 

3) Syntax for GOT_ENTRY(NAME)  and GOT(NAME),  like    . - .LCTOC1 (line 57) and .text 2 (line 50)
could not find then in the GNU douments (ld, as, gcc, glibc etc). 


Thanks for the help!! 


[-- Attachment #2: Type: text/html, Size: 2166 bytes --]

             reply	other threads:[~2006-08-29  2:26 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-29  1:54 enorm [this message]
2006-08-29 20:01 ` MPC85xx u-boot definition Becky Bruce

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='017001c6cb0e$1b81f440$a309a8c0@SZD823' \
    --to=enorm@126.com \
    --cc=linuxppc-embedded@ozlabs.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox