Commit 1cb0661e authored by Andrzej Zaborowski's avatar Andrzej Zaborowski
Browse files

arm: Reserve code buffer in memory range reachable for pc-relative branch. 

Unfortunately this range is so narrow that I'm not sure if it makes more
sense to always use memory load to pc kind of branch instead.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5844 c046a42c-6fe2-441c-8c8c-71466251a162
parent 3233f0d4

exec.c

+6 −0
Original line number Diff line number Diff line
@@ -436,6 +436,12 @@ static void code_gen_alloc(unsigned long tb_size) 
        start = (void *) 0x60000000UL;

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

            code_gen_buffer_size = (512 * 1024 * 1024);

#elif defined(__arm__)

        /* Map the buffer below 64M, so we can use direct calls and branches */

        flags |= MAP_FIXED;

        start = (void *) 0x01000000UL;

        if (code_gen_buffer_size > 16 * 1024 * 1024)

            code_gen_buffer_size = 16 * 1024 * 1024;

#endif

        code_gen_buffer = mmap(start, code_gen_buffer_size,

                               PROT_WRITE | PROT_READ | PROT_EXEC,