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[Qemu-devel] [PATCH 06/35] tcg-s390: Allocate the code_gen_buffer near t
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 06/35] tcg-s390: Allocate the code_gen_buffer near the main program. |
Date: |
Fri, 4 Jun 2010 12:14:14 -0700 |
This allows the use of direct calls to the helpers,
and a direct branch back to the epilogue.
Signed-off-by: Richard Henderson <address@hidden>
---
exec.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/exec.c b/exec.c
index bb3dcad..7bbfe60 100644
--- a/exec.c
+++ b/exec.c
@@ -519,6 +519,13 @@ static void code_gen_alloc(unsigned long tb_size)
start = (void *) 0x01000000UL;
if (code_gen_buffer_size > 16 * 1024 * 1024)
code_gen_buffer_size = 16 * 1024 * 1024;
+#elif defined(__s390x__)
+ /* Map the buffer so that we can use direct calls and branches. */
+ /* We have a +- 4GB range on the branches; leave some slop. */
+ if (code_gen_buffer_size > (3ul * 1024 * 1024 * 1024)) {
+ code_gen_buffer_size = 3ul * 1024 * 1024 * 1024;
+ }
+ start = (void *)0x90000000UL;
#endif
code_gen_buffer = mmap(start, code_gen_buffer_size,
PROT_WRITE | PROT_READ | PROT_EXEC,
--
1.7.0.1
[Qemu-devel] [PATCH 07/35] tcg: Optionally sign-extend 32-bit arguments for 64-bit host., Richard Henderson, 2010/06/04
[Qemu-devel] [PATCH 08/35] s390: Update disassembler to the last GPLv2 from binutils., Richard Henderson, 2010/06/04
[Qemu-devel] [PATCH 09/35] s390: Disassemble some general-instruction-extension insns., Richard Henderson, 2010/06/04