From 59aadb4f5b15eff968ed00ad29816ac19bef507d Mon Sep 17 00:00:00 2001

From: Richard Henderson <rth@twiddle.net>

Date: Fri, 21 Sep 2012 10:40:48 -0700

Subject: [PATCH] tcg-sparc: Don't MAP_FIXED on top of the program

The address we pick in sparc64.ld is also 0x60000000, so doing a fixed map

on top of that is guaranteed to blow up.  Choosing 0x40000000 is exactly

right for the max of code_gen_buffer_size set below.

No need to ever use MAP_FIXED.  While getting our desired address helps

optimize the generated code, we won't fail if we don't get it.

Signed-off-by: Richard Henderson <rth@twiddle.net>

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

---

 exec.c | 6 ++----

 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/exec.c b/exec.c

index 5834766..871a68a 100644

--- a/exec.c

+++ b/exec.c

@@ -543,8 +543,7 @@ static void code_gen_alloc(unsigned long tb_size)

             code_gen_buffer_size = (800 * 1024 * 1024);

 #elif defined(__sparc_v9__)

         // Map the buffer below 2G, so we can use direct calls and branches

-        flags |= MAP_FIXED;

-        start = (void *) 0x60000000UL;

+        start = (void *) 0x40000000UL;

         if (code_gen_buffer_size > (512 * 1024 * 1024))

             code_gen_buffer_size = (512 * 1024 * 1024);

 #elif defined(__arm__)

@@ -584,8 +583,7 @@ static void code_gen_alloc(unsigned long tb_size)

             code_gen_buffer_size = (800 * 1024 * 1024);

 #elif defined(__sparc_v9__)

         // Map the buffer below 2G, so we can use direct calls and branches

-        flags |= MAP_FIXED;

-        addr = (void *) 0x60000000UL;

+        addr = (void *) 0x40000000UL;

         if (code_gen_buffer_size > (512 * 1024 * 1024)) {

             code_gen_buffer_size = (512 * 1024 * 1024);

         }

-- 

1.7.12.1