From: Richard Henderson <rth@twiddle.net>
Date: Mon, 31 Mar 2014 21:27:27 +0000 (-0700)
Subject: tcg: Introduce byte pointer arithmetic helpers
X-Git-Tag: Tizen_Studio_1.3_Release_p2.3.2~209^2~849^2~22
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=52a1f64ec54354157ee73435e53d2dfda0414d07;p=sdk%2Femulator%2Fqemu.git

tcg: Introduce byte pointer arithmetic helpers

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---

diff --git a/tcg/tcg.h b/tcg/tcg.h
index a6a2d06080..d38c92d636 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -723,6 +723,51 @@ TCGv_i64 tcg_const_i64(int64_t val);
 TCGv_i32 tcg_const_local_i32(int32_t val);
 TCGv_i64 tcg_const_local_i64(int64_t val);
 
+/**
+ * tcg_ptr_byte_diff
+ * @a, @b: addresses to be differenced
+ *
+ * There are many places within the TCG backends where we need a byte
+ * difference between two pointers.  While this can be accomplished
+ * with local casting, it's easy to get wrong -- especially if one is
+ * concerned with the signedness of the result.
+ *
+ * This version relies on GCC's void pointer arithmetic to get the
+ * correct result.
+ */
+
+static inline ptrdiff_t tcg_ptr_byte_diff(void *a, void *b)
+{
+    return a - b;
+}
+
+/**
+ * tcg_pcrel_diff
+ * @s: the tcg context
+ * @target: address of the target
+ *
+ * Produce a pc-relative difference, from the current code_ptr
+ * to the destination address.
+ */
+
+static inline ptrdiff_t tcg_pcrel_diff(TCGContext *s, void *target)
+{
+    return tcg_ptr_byte_diff(target, s->code_ptr);
+}
+
+/**
+ * tcg_current_code_size
+ * @s: the tcg context
+ *
+ * Compute the current code size within the translation block.
+ * This is used to fill in qemu's data structures for goto_tb.
+ */
+
+static inline size_t tcg_current_code_size(TCGContext *s)
+{
+    return tcg_ptr_byte_diff(s->code_ptr, s->code_buf);
+}
+
 /**
  * tcg_qemu_tb_exec:
  * @env: CPUArchState * for the CPU