This commit adds tcg_target_init, aligning it with the Wasm backend's
register and stack usage.
Signed-off-by: Kohei Tokunaga <ktokunaga.m...@gmail.com>
---
tcg/wasm/tcg-target.c.inc | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/tcg/wasm/tcg-target.c.inc b/tcg/wasm/tcg-target.c.inc
index 25691307b4..3bb4864da5 100644
--- a/tcg/wasm/tcg-target.c.inc
+++ b/tcg/wasm/tcg-target.c.inc
@@ -2812,3 +2812,32 @@ static int tcg_out_tb_end(TCGContext *s)
return 0;
}
+
+static void tcg_target_init(TCGContext *s)
+{
+ /* The current code uses uint8_t for tcg operations. */
+ tcg_debug_assert(tcg_op_defs_max <= UINT8_MAX);
+
+ /* Registers available for 32 bit operations. */
+ tcg_target_available_regs[TCG_TYPE_I32] = BIT(TCG_TARGET_NB_REGS) - 1;
+ /* Registers available for 64 bit operations. */
+ tcg_target_available_regs[TCG_TYPE_I64] = BIT(TCG_TARGET_NB_REGS) - 1;
+ /*
+ * The TCI "registers" are in the local stack frame and
+ * cannot be clobbered by the called helper functions. Additionally, Wasm
+ * modules for a TB and QEMU itself (i.e. helpers) are separated so also
+ * those variables aren't clobbered by the called helper functions.
+ * However, the TB assumes a 128-bit return value and assigns to
+ * the return value registers.
+ */
+ tcg_target_call_clobber_regs =
+ MAKE_64BIT_MASK(TCG_REG_R0, 128 / TCG_TARGET_REG_BITS);
+
+ s->reserved_regs = 0;
+ tcg_regset_set_reg(s->reserved_regs, TCG_REG_TMP);
+ tcg_regset_set_reg(s->reserved_regs, TCG_REG_CALL_STACK);
+
+ /* The call arguments come first, followed by the temp storage. */
+ tcg_set_frame(s, TCG_REG_CALL_STACK, TCG_STATIC_CALL_ARGS_SIZE,
+ TCG_STATIC_FRAME_SIZE);
+}
--
2.43.0
