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[PATCH 21/30] tcg/loongarch: Implement tcg_out_call
From: |
WANG Xuerui |
Subject: |
[PATCH 21/30] tcg/loongarch: Implement tcg_out_call |
Date: |
Mon, 20 Sep 2021 16:04:42 +0800 |
Signed-off-by: WANG Xuerui <git@xen0n.name>
---
tcg/loongarch/tcg-target.c.inc | 37 ++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/tcg/loongarch/tcg-target.c.inc b/tcg/loongarch/tcg-target.c.inc
index fb0143474a..01c6002fdb 100644
--- a/tcg/loongarch/tcg-target.c.inc
+++ b/tcg/loongarch/tcg-target.c.inc
@@ -457,6 +457,42 @@ static void tcg_out_brcond(TCGContext *s, TCGCond cond,
TCGReg arg1,
tcg_out32(s, encode_djsk16_insn(op, arg1, arg2, 0));
}
+static void tcg_out_call_int(TCGContext *s, const tcg_insn_unit *arg, bool
tail)
+{
+ TCGReg link = tail ? TCG_REG_ZERO : TCG_REG_RA;
+ ptrdiff_t offset = tcg_pcrel_diff(s, arg);
+ int ret;
+
+ tcg_debug_assert((offset & 2) == 0);
+ if (offset == sextreg(offset, 0, 28)) {
+ /* short jump: +/- 256MiB */
+ if (tail) {
+ tcg_out_opc_b(s, offset >> 2);
+ } else {
+ tcg_out_opc_bl(s, offset >> 2);
+ }
+ } else if (TCG_TARGET_REG_BITS == 32 || offset == (int32_t)offset) {
+ /* long jump: +/- 2GiB */
+ tcg_out_opc_pcaddu12i(s, TCG_REG_TMP0, 0);
+ tcg_out_opc_jirl(s, link, TCG_REG_TMP0, 0);
+ ret = reloc_call(s->code_ptr - 2, arg);
+ tcg_debug_assert(ret == true);
+ } else if (TCG_TARGET_REG_BITS == 64) {
+ /* far jump: 64-bit */
+ tcg_target_long imm = sextreg((tcg_target_long)arg, 0, 12);
+ tcg_target_long base = (tcg_target_long)arg - imm;
+ tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP0, base);
+ tcg_out_opc_jirl(s, link, TCG_REG_TMP0, imm >> 2);
+ } else {
+ g_assert_not_reached();
+ }
+}
+
+static void tcg_out_call(TCGContext *s, const tcg_insn_unit *arg)
+{
+ tcg_out_call_int(s, arg, false);
+}
+
/*
* Entry-points
*/
@@ -779,6 +815,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
case INDEX_op_mov_i32: /* Always emitted via tcg_out_mov. */
case INDEX_op_mov_i64:
+ case INDEX_op_call: /* Always emitted via tcg_out_call. */
default:
g_assert_not_reached();
}
--
2.33.0