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authorPeter Maydell <peter.maydell@linaro.org>2013-02-22 18:10:00 +0000
committerBlue Swirl <blauwirbel@gmail.com>2013-03-03 14:28:19 +0000
commit0980011b4f66482d2733ab2dd0f2f61747772c6b (patch)
treeecf9d171341120c519fa34aea30841223d66c8fd /cpu-exec.c
parent07ca08bac88f116e9beb05d48d07b406ace8fbc0 (diff)
downloadqemu-arm-0980011b4f66482d2733ab2dd0f2f61747772c6b.tar.gz
tcg: Document tcg_qemu_tb_exec() and provide constants for low bit uses
Document tcg_qemu_tb_exec(). In particular, its return value is a combination of a pointer to the next translation block and some extra information in the low two bits. Provide some #defines for the values passed in these bits to improve code clarity. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Diffstat (limited to 'cpu-exec.c')
-rw-r--r--cpu-exec.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/cpu-exec.c b/cpu-exec.c
index afbe4977ab..2c6b0918de 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -72,7 +72,7 @@ static void cpu_exec_nocache(CPUArchState *env, int max_cycles,
next_tb = tcg_qemu_tb_exec(env, tb->tc_ptr);
cpu->current_tb = NULL;
- if ((next_tb & 3) == 2) {
+ if ((next_tb & TB_EXIT_MASK) == TB_EXIT_ICOUNT_EXPIRED) {
/* Restore PC. This may happen if async event occurs before
the TB starts executing. */
cpu_pc_from_tb(env, tb);
@@ -584,7 +584,8 @@ int cpu_exec(CPUArchState *env)
spans two pages, we cannot safely do a direct
jump. */
if (next_tb != 0 && tb->page_addr[1] == -1) {
- tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
+ tb_add_jump((TranslationBlock *)(next_tb & ~TB_EXIT_MASK),
+ next_tb & TB_EXIT_MASK, tb);
}
spin_unlock(&tcg_ctx.tb_ctx.tb_lock);
@@ -598,10 +599,10 @@ int cpu_exec(CPUArchState *env)
tc_ptr = tb->tc_ptr;
/* execute the generated code */
next_tb = tcg_qemu_tb_exec(env, tc_ptr);
- if ((next_tb & 3) == 2) {
+ if ((next_tb & TB_EXIT_MASK) == TB_EXIT_ICOUNT_EXPIRED) {
/* Instruction counter expired. */
int insns_left;
- tb = (TranslationBlock *)(next_tb & ~3);
+ tb = (TranslationBlock *)(next_tb & ~TB_EXIT_MASK);
/* Restore PC. */
cpu_pc_from_tb(env, tb);
insns_left = env->icount_decr.u32;