From: Richard Henderson <rth@twiddle.net>
To: Aurelien Jarno <aurelien@aurel32.net>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH for-next 6/8] tcg-i386: Use new return-argument ld/st helpers
Date: Thu, 15 Aug 2013 13:44:08 -0700 [thread overview]
Message-ID: <520D3D98.80306@twiddle.net> (raw)
In-Reply-To: <20130815155446.GA29142@ohm.aurel32.net>
On 08/15/2013 08:54 AM, Aurelien Jarno wrote:
>> > # define GETRA() ((uintptr_t)__builtin_return_address(0))
>> > -# define GETPC_LDST() ((uintptr_t)(GETRA() + 7 + \
>> > - *(int32_t *)((void *)GETRA() + 3) - 1))
>> > +/* The return address argument for ldst is passed directly. */
>> > +# define GETPC_LDST() (abort(), 0)
> Why an abort here, while in the arm version, you adds support for
> not defining GETPC_LDST?
>
GETPC_LDST is for the original helpers, when called from TCG.
In the arm case, TCG still uses the original helpers, so GETPC_LDST is used.
In the i386, TCG never uses the original helpers, so GETPC_LDST should never be
used. We could do like arm and completely drop the check, I suppose.
r~
next prev parent reply other threads:[~2013-08-15 20:44 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-05 18:07 [Qemu-devel] [PATCH for-next 0/8] Improve tcg ldst optimization Richard Henderson
2013-08-05 18:07 ` [Qemu-devel] [PATCH for-next 1/8] tcg-i386: Add and use tcg_out64 Richard Henderson
2013-08-15 15:54 ` Aurelien Jarno
2013-08-05 18:07 ` [Qemu-devel] [PATCH for-next 2/8] tcg-i386: Try pc-relative lea for constant formation Richard Henderson
2013-08-15 15:54 ` Aurelien Jarno
2013-08-05 18:07 ` [Qemu-devel] [PATCH for-next 3/8] tcg-i386: Tidy qemu_ld/st slow path Richard Henderson
2013-08-15 15:54 ` Aurelien Jarno
2013-08-05 18:07 ` [Qemu-devel] [PATCH for-next 4/8] tcg: Add mmu helpers that take a return address argument Richard Henderson
2013-08-15 15:54 ` Aurelien Jarno
2013-08-15 20:45 ` Richard Henderson
2013-08-16 8:35 ` Aurelien Jarno
2013-08-05 18:07 ` [Qemu-devel] [PATCH for-next 5/8] tcg: Tidy softmmu_template.h Richard Henderson
2013-08-15 15:54 ` Aurelien Jarno
2013-08-05 18:07 ` [Qemu-devel] [PATCH for-next 6/8] tcg-i386: Use new return-argument ld/st helpers Richard Henderson
2013-08-15 15:54 ` Aurelien Jarno
2013-08-15 20:44 ` Richard Henderson [this message]
2013-08-16 8:35 ` Aurelien Jarno
2013-08-05 18:07 ` [Qemu-devel] [PATCH for-next 7/8] tcg-arm: Use ldrd/strd for appropriate qemu_ld/st64 Richard Henderson
2013-08-05 18:07 ` [Qemu-devel] [PATCH for-next 8/8] tcg-arm: Rearrange slow-path qemu_ld/st Richard Henderson
2013-08-16 8:36 ` Aurelien Jarno
2013-08-16 8:55 ` Andreas Färber
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