[Qemu-devel] [PATCH v2 0/3] Relax code buffer size limitation on aarch64 hosts

From: Pranith Kumar <bobby.prani@gmail.com>
To: alex.bennee@linaro.org
Cc: qemu-devel@nongnu.org, rth@twiddle.net
Subject: [Qemu-devel] [PATCH v2 0/3] Relax code buffer size limitation on aarch64 hosts
Date: Thu, 29 Jun 2017 03:52:40 -0400	[thread overview]
Message-ID: <20170629075243.26984-1-bobby.prani@gmail.com> (raw)

Hello,

The following patches enable us to relax the 128MB code buffer size
limitation on ARM64 hosts.

Patch 2 increases this limitation to 3GB, even though ADRP+ADD can
address 4GB of pc-relative addresses to give us some slack.

Patch 3 uses LDR (literal) to load the address, allowing us to remove
the code buffer size limitation altogether. However, I feel that 3GB
should be sufficient for now and hence did not change it ;). It
however enables the !USE_DIRECT_JUMP path on aarch64 hosts.

Thanks,

Pranith Kumar (3):
  tcg/aarch64: Introduce and use long branch to register
  tcg/aarch64: Use ADRP+ADD to compute target address
  tcg/aarch64: Enable indirect jump path using LDR (literal)

 accel/tcg/translate-all.c    |  2 +-
 tcg/aarch64/tcg-target.inc.c | 69 +++++++++++++++++++++++++++++++++++---------
 2 files changed, 56 insertions(+), 15 deletions(-)

-- 
2.13.0