qemu/0083-tcg-sparc-Don-t-MAP_FIXED-on-top-of-the-program.patch

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2012-10-28 18:05:07 +00:00
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