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Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for a
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64 |
Date: |
Fri, 24 May 2013 18:28:41 +0100 |
On 24 May 2013 18:17, Richard Henderson <address@hidden> wrote:
> On 05/24/2013 10:08 AM, Peter Maydell wrote:
>> Where's the waste? The procedure calling standard mandates that we
>> set FP up, so it's not like we can use it as a general purpose
>> register anywhere.
>
> Well, the calling standard is another document that's not available
> yet
Nope, it's been available for ages, along with the ELF and DWARF
specs and the C++ ABI:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ihi0055b/index.html
> so obviously I don't know the rationale for that decision. But
> it does seem like a register performing no useful function...
It does what a frame pointer usually does, ie permits the debugger
(and other tools) to unwind the stack.
thanks
-- PMM
- Re: [Qemu-devel] [PATCH 1/4] include/elf.h: add aarch64 ELF machine and relocs, (continued)
- [Qemu-devel] [PATCH 3/4] configure: permit compilation on arm aarch64, Claudio Fontana, 2013/05/23
- [Qemu-devel] [PATCH 4/4] tcg/aarch64: more ops in preparation of tlb lookup, Claudio Fontana, 2013/05/23
- [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Claudio Fontana, 2013/05/23
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Richard Henderson, 2013/05/23
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Claudio Fontana, 2013/05/24
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Richard Henderson, 2013/05/24
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Peter Maydell, 2013/05/24
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Richard Henderson, 2013/05/24
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64,
Peter Maydell <=
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Richard Henderson, 2013/05/24
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Claudio Fontana, 2013/05/27
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Richard Henderson, 2013/05/27
- Re: [Qemu-devel] [PATCH 3/3] tcg/aarch64: implement new TCG target for aarch64, Laurent Desnogues, 2013/05/27
- Re: [Qemu-devel] [PATCH 3/3] tcg/aarch64: implement new TCG target for aarch64, Claudio Fontana, 2013/05/28
- Re: [Qemu-devel] [PATCH 3/3] tcg/aarch64: implement new TCG target for aarch64, Laurent Desnogues, 2013/05/28
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Claudio Fontana, 2013/05/28
- Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Richard Henderson, 2013/05/28
Re: [Qemu-devel] [PATCH 2/4] tcg/aarch64: implement new TCG target for aarch64, Peter Maydell, 2013/05/23