From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=37500 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OKcMc-0004gC-JO for qemu-devel@nongnu.org; Fri, 04 Jun 2010 15:15:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OKcMa-0002Cx-Ij for qemu-devel@nongnu.org; Fri, 04 Jun 2010 15:15:30 -0400 Received: from are.twiddle.net ([75.149.56.221]:54755) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OKcMZ-0002Cc-Sz for qemu-devel@nongnu.org; Fri, 04 Jun 2010 15:15:28 -0400 From: Richard Henderson Date: Fri, 4 Jun 2010 12:14:14 -0700 Message-Id: <1275678883-7082-7-git-send-email-rth@twiddle.net> In-Reply-To: <1275678883-7082-1-git-send-email-rth@twiddle.net> References: <1275678883-7082-1-git-send-email-rth@twiddle.net> Subject: [Qemu-devel] [PATCH 06/35] tcg-s390: Allocate the code_gen_buffer near the main program. List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: agraf@suse.de, aurelien@aurel32.net This allows the use of direct calls to the helpers, and a direct branch back to the epilogue. Signed-off-by: Richard Henderson --- exec.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/exec.c b/exec.c index bb3dcad..7bbfe60 100644 --- a/exec.c +++ b/exec.c @@ -519,6 +519,13 @@ static void code_gen_alloc(unsigned long tb_size) start = (void *) 0x01000000UL; if (code_gen_buffer_size > 16 * 1024 * 1024) code_gen_buffer_size = 16 * 1024 * 1024; +#elif defined(__s390x__) + /* Map the buffer so that we can use direct calls and branches. */ + /* We have a +- 4GB range on the branches; leave some slop. */ + if (code_gen_buffer_size > (3ul * 1024 * 1024 * 1024)) { + code_gen_buffer_size = 3ul * 1024 * 1024 * 1024; + } + start = (void *)0x90000000UL; #endif code_gen_buffer = mmap(start, code_gen_buffer_size, PROT_WRITE | PROT_READ | PROT_EXEC, -- 1.7.0.1