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

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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
This commit is contained in:
balrog
2008-12-01 02:10:17 +00:00
parent 3233f0d463
commit 1cb0661e00
1 changed files with 6 additions and 0 deletions
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exec.c
+6
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@@ -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,