tcg/arm: remove fixed map code buffer restriction

On ARM, don't map the code buffer at a fixed location, and fix up the
call/goto tcg routines to let it do long jumps.

Mapping the code buffer at a fixed address could sometimes result in it being
mapped over the top of the heap with pretty random results.

Signed-off-by: Dr. David Alan Gilbert <david.gilbert@linaro.org>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/exec.c b/exec.c
index d8b2180170..4f79cbb27e 100644
--- a/exec.c
+++ b/exec.c
@@ -497,9 +497,7 @@ static void code_gen_alloc(unsigned long tb_size)
         if (code_gen_buffer_size > (512 * 1024 * 1024))
             code_gen_buffer_size = (512 * 1024 * 1024);
 #elif defined(__arm__)
-        /* Map the buffer below 32M, so we can use direct calls and branches */
-        flags |= MAP_FIXED;
-        start = (void *) 0x01000000UL;
+        /* Keep the buffer no bigger than 16GB to branch between blocks */
         if (code_gen_buffer_size > 16 * 1024 * 1024)
             code_gen_buffer_size = 16 * 1024 * 1024;
 #elif defined(__s390x__)