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> > Argh! I've just come across another nasty gotcha in this code, if I try > to make it so that the regcache does not hold any pseudos: There's an > implicit assumption that all the physical registers will preceed the > pseudo registers. I should have warned you to not go looking under rocks :-( I think the real issue on this one is that the pseudo-registers and raw registers currently occupy the same register number space. If there was clear separation then it would be clear how many of these problems should be handled - you couldn't for instance try to put a pseudo in the middle of the raw part of the register buffer. I think it was mentioned, when adding register_{read,write} that this was likely to be sufficient rope to .... See also gdb/122. > This is a major problem when I want to implement the banked registers for > the ARM, since then r8 through r14 (which must have regnums 8 through 14 > for stabs debug info to work correctly), need to be pseudo registers (they > must access the correct physical register for the current processor mode); > which means they must appear in the middle of the register range. Make these pseudo registers (the corresponding real register_name() return ""), map stabs_regnum onto that and then (for all raw registers) use register register_{read,write} map onto the correct raw register. You'll also need to tweak saved_regs[] to set the pseudo and not the real register address. Even consider making everything a pseudo so that you know exactly what you have at any stage. > I can make my arm_register_read function correctly remap the register > numbers, but then I run into the problem that REGISTER_RAW_SIZE is used > both above and below the regcache. I don't understand why this is a problem. I think a register (pseudo or raw) should have only one size (c.f. my register_size() patch). Andrew
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