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Re: [Qemu-devel] [PATCH 11/26] tcg-aarch64: Reuse FP and LR in translate
From: |
Richard Henderson |
Subject: |
Re: [Qemu-devel] [PATCH 11/26] tcg-aarch64: Reuse FP and LR in translated code |
Date: |
Fri, 28 Mar 2014 06:23:57 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
On 03/28/2014 02:48 AM, Claudio Fontana wrote:
> On 15.03.2014 03:48, Richard Henderson wrote:
>> We don't need the FP within translated code, and the LR is
>> otherwise unused.
>>
>> Signed-off-by: Richard Henderson <address@hidden>
>
> The downside of this is that it disregards the procedure call standard from
> ARM.
In what way do you believe the call standard to require a frame pointer?
Certainly GCC avoids generating one when it isn't needed, so why should we?
In any case, the real help comes in patch 14/26 where I implement the jit hook
so that GDB can unwind through the code_gen_buffer.
r~
- [Qemu-devel] [PATCH 05/26] tcg-aarch64: Use ORRI in tcg_out_movi, (continued)
- [Qemu-devel] [PATCH 05/26] tcg-aarch64: Use ORRI in tcg_out_movi, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 08/26] tcg-aarch64: Use symbolic names for branches, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 09/26] tcg-aarch64: Create tcg_out_brcond, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 10/26] tcg-aarch64: Use CBZ and CBNZ, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 11/26] tcg-aarch64: Reuse FP and LR in translated code, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 12/26] tcg-aarch64: Introduce tcg_out_insn_3314, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 13/26] tcg-aarch64: Rearrange prologue insn order, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 14/26] tcg-aarch64: Implement tcg_register_jit, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 15/26] tcg-aarch64: Avoid add with zero in tlb load, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 16/26] tcg-aarch64: Use tcg_out_call for qemu_ld/st, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 17/26] tcg-aarch64: Use ADR to pass the return address to the ld/st helpers, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 18/26] tcg-aarch64: Use TCGMemOp in qemu_ld/st, Richard Henderson, 2014/03/14