Re: mips64 assembler
Greetings!
David Kuehling <dvdkhlng@gmx.de> writes:
>>>>>> "Camm" == Camm Maguire <camm@maguirefamily.org> writes:
>
>> Greetings! What is wrong with this stub attempting a jump to contents
>> of register $t0?
>
>> (gdb) p/x *(ul *)0x109413c@4 $3 = {0x3c080077, /*lui t0,0x77*/
>> 0x2508a170, /*addui t0,t0,0xa170*/ 0x8d08a288, /*lw t0,-23928(t0) */
>> 0x1000008 /* jr t0*/ }
>
>> (gdb) c Program received signal SIGTRAP, Trace/breakpoint trap.
>> 0x01094148 in ?? () /*this is the jump instruction*/ (gdb) i reg t0
>> t0: 0x2ae13bf0 /*this is the correct address*/
>
> I don't understand the context of what you're trying to do. But when I
> did some MIPS32 OABI assembly last time, I noticed that calls into
> shared libraries _must_ load the address of the function into t9 before
> doing the jump. Else position-independant code won't work.
> I.e. replace t0 in your stub with t9.
>
Yes, ran into this one too and solved trial and error. Thank you so
much for the reply! Should have read email before experimenting.
Take care,
> BTW why not use gdb's 'disas' command to look at the stub?
>
> David
> --
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--
Camm Maguire camm@maguirefamily.org
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