Re: mips64 assembler
David Daney a écrit :
> On 09/17/2010 01:44 PM, Camm Maguire wrote:
>> David Daney<email@example.com> writes:
>>> On 09/17/2010 07:16 AM, Camm Maguire wrote:
>>>> Greetings! Is there anyway to load a known 64bit number into a given
>>>> register in two instructions?
>>> Not in the general case where the value of the 64-bit number is
>>>> Said number is guaranteed to be within
>>>> 32bits of the current value of another register.
>>> In other words, you want to add an arbitrary 32-bit constant to the
>>> value in a register. You would need three instructions to do this.
>>> Two to generate the 32-bit constant and another to do the addition.
>>> David Daney.
>> Alas, this was as I had expected. Perhaps you can suggest a course of
>> On mips only, there is no plt support -- executables instead have
>> .MIPS.stubs entries for lazy relocations to external symbols. Problem
>> is, these are only callable if the gp register is left at its
>> canonical position. I need to load, relocate, and execute code which
>> might call these functions, which I currently redirect to the stub.
>> This means that any .got references to addresses in the code to be
>> relocated, which will of course not be in the global .got table, have
>> to be patched to immediate addressess, which on mips32 is easy
>> enough -- ld v0,oooo(gp) -> lui v0,hhhh. This won't work on mips64.
> PLT support works with the n32 ABI (with new toolchains). Can you use that?
It actually works with all ABI.
Aurelien Jarno GPG: 1024D/F1BCDB73