Re: Question about powerpc branch instructions
On Fri, Aug 07, 2009 at 05:47:00PM +0900, HongWoo Lee wrote: > #2: Is b similar to the jmp in x86 ? Yes, specifically a relative near jmp. > and bl is similar to the call in x86 ? Sort of (and again, specifically a relative near call). Call on x86 pushes the return address on the stack, while bl on powerpc puts the return address in a special register (lr) that the called function has to save on the stack itself if it wants to call another function. -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: Question about powerpc branch instructions
On Fri, 2009-08-07 at 17:47 +0900, HongWoo Lee wrote: > #1: Is there any special reason to concatenate 0b00 ? Why 0b00 ?? Because instructions have to be aligned on 4 bytes boundaries ? > #2: Is b similar to the jmp in x86 ? and bl is similar to the call in x86 ? I'm not totally familiar with x86 but I "sounds" like it, though of course they can be (ab)used in some more subtle ways. Cheers, Ben. > Thanks in advance. > > HongWoo. > ___ > Linuxppc-dev mailing list > Linuxppc-dev@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/linuxppc-dev ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
