* What does instruction LA mean? @ 2001-03-28 5:32 Jones Madhuri 2001-03-28 6:19 ` Dan Malek 2001-03-29 4:06 ` Srinivas Rao.M 0 siblings, 2 replies; 3+ messages in thread From: Jones Madhuri @ 2001-03-28 5:32 UTC (permalink / raw) To: linuxppc-embedded Hello, I am novice in Power PC assembly code and I am trying compile in following code (written by someone else) into head_8xx.S. This function has instruction like mfspr r3, IC_CST LA r4, IC_CST_LEN However the hardhat assembler doesn't understand the mnemonic LA, is LA same as add immediate instruction? addi r4, r4, IC_CST_LEN Please help!! Thanks. M.J. Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/?.refer=text ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: What does instruction LA mean? 2001-03-28 5:32 What does instruction LA mean? Jones Madhuri @ 2001-03-28 6:19 ` Dan Malek 2001-03-29 4:06 ` Srinivas Rao.M 1 sibling, 0 replies; 3+ messages in thread From: Dan Malek @ 2001-03-28 6:19 UTC (permalink / raw) To: Jones Madhuri; +Cc: linuxppc-embedded Jones Madhuri wrote: > I am novice in Power PC assembly code and I am trying > compile in following code (written by someone else) > into head_8xx.S. Novice or otherwise, you shouldn't be placing any code in head_8xx.S. It's a guarantee you won't get Linux to boot. > mfspr r3, IC_CST > LA r4, IC_CST_LEN > > However the hardhat assembler doesn't understand the > mnemonic LA, Because there is no such instruction. It looks like a macro that will result in the two instruction pair: lis r4, IC_CST_LEN@h ori r4, r4, IC_CST_LEN@l You shouldn't be messing around with those cache management registers...... -- Dan ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: What does instruction LA mean? 2001-03-28 5:32 What does instruction LA mean? Jones Madhuri 2001-03-28 6:19 ` Dan Malek @ 2001-03-29 4:06 ` Srinivas Rao.M 1 sibling, 0 replies; 3+ messages in thread From: Srinivas Rao.M @ 2001-03-29 4:06 UTC (permalink / raw) To: Jones Madhuri; +Cc: linuxppc-embedded hi madhuri, The LA here is a macro. I am not sure about the linux. but in the pSOS+ i have seen a macro written in assembly language, which does the 'loading of address to a register' job. Just check the assembly source files, you may find macro something like this. .macro LA reg,symbol lis reg,%hiadj(symbol) addi reg,reg,%lo(symbol) .endm such macros are written to load the value(constant) in to a register. cheers, srini... On Tue, 27 Mar 2001, Jones Madhuri wrote: > > Hello, > > I am novice in Power PC assembly code and I am trying > compile in following code (written by someone else) > into head_8xx.S. > > This function has instruction like > > mfspr r3, IC_CST > LA r4, IC_CST_LEN > > However the hardhat assembler doesn't understand the > mnemonic LA, is LA same as add immediate instruction? > addi r4, r4, IC_CST_LEN > > Please help!! > > Thanks. > > M.J. > > Get email at your own domain with Yahoo! Mail. > http://personal.mail.yahoo.com/?.refer=text > > -- We are responsible for what we are, and whatever we wish ourselves to be, we have the power to make ourselves. If what we are now has been the result of our own past actions, it certainly follows that whatever we wish to be in future can be produced by our present actions; so we have to know how to act. -Swami Vivekananda ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2001-03-29 4:06 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2001-03-28 5:32 What does instruction LA mean? Jones Madhuri 2001-03-28 6:19 ` Dan Malek 2001-03-29 4:06 ` Srinivas Rao.M
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