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[PATCH 2/3] target/mips: implement Octeon-specific BBIT instructions
From: |
Pavel Dovgalyuk |
Subject: |
[PATCH 2/3] target/mips: implement Octeon-specific BBIT instructions |
Date: |
Tue, 07 Jun 2022 11:59:25 +0300 |
User-agent: |
StGit/0.23 |
This patch introduces Octeon-specific decoder and implements
check-bit-and-jump instructions.
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
---
target/mips/tcg/meson.build | 2 +
target/mips/tcg/octeon.decode | 14 ++++++++++
target/mips/tcg/octeon_translate.c | 53 ++++++++++++++++++++++++++++++++++++
target/mips/tcg/translate.c | 5 +++
target/mips/tcg/translate.h | 1 +
5 files changed, 75 insertions(+)
create mode 100644 target/mips/tcg/octeon.decode
create mode 100644 target/mips/tcg/octeon_translate.c
diff --git a/target/mips/tcg/meson.build b/target/mips/tcg/meson.build
index 98003779ae..7ee969ec8f 100644
--- a/target/mips/tcg/meson.build
+++ b/target/mips/tcg/meson.build
@@ -3,6 +3,7 @@ gen = [
decodetree.process('msa.decode', extra_args: '--decode=decode_ase_msa'),
decodetree.process('tx79.decode', extra_args: '--static-decode=decode_tx79'),
decodetree.process('vr54xx.decode', extra_args:
'--decode=decode_ext_vr54xx'),
+ decodetree.process('octeon.decode', extra_args:
'--decode=decode_ext_octeon'),
]
mips_ss.add(gen)
@@ -24,6 +25,7 @@ mips_ss.add(files(
))
mips_ss.add(when: 'TARGET_MIPS64', if_true: files(
'tx79_translate.c',
+ 'octeon_translate.c',
), if_false: files(
'mxu_translate.c',
))
diff --git a/target/mips/tcg/octeon.decode b/target/mips/tcg/octeon.decode
new file mode 100644
index 0000000000..c06d576292
--- /dev/null
+++ b/target/mips/tcg/octeon.decode
@@ -0,0 +1,14 @@
+# Octeon Architecture Module instruction set
+#
+# Copyright (C) 2022 Pavel Dovgalyuk
+#
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+
+# Branch on bit set or clear
+# BBIT0 110010 ..... ..... ................
+# BBIT032 110110 ..... ..... ................
+# BBIT1 111010 ..... ..... ................
+# BBIT132 111110 ..... ..... ................
+
+BBIT 11 set:1 shift:1 10 rs:5 p:5 offset:16
diff --git a/target/mips/tcg/octeon_translate.c
b/target/mips/tcg/octeon_translate.c
new file mode 100644
index 0000000000..bd87066b01
--- /dev/null
+++ b/target/mips/tcg/octeon_translate.c
@@ -0,0 +1,53 @@
+/*
+ * Octeon-specific instructions translation routines
+ *
+ * Copyright (c) 2022 Pavel Dovgalyuk
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "tcg/tcg-op.h"
+#include "tcg/tcg-op-gvec.h"
+#include "exec/helper-gen.h"
+#include "translate.h"
+
+/* Include the auto-generated decoder. */
+#include "decode-octeon.c.inc"
+
+static bool trans_BBIT(DisasContext *ctx, arg_BBIT *a)
+{
+ int p = a->p;
+
+ if (ctx->hflags & MIPS_HFLAG_BMASK) {
+#ifdef MIPS_DEBUG_DISAS
+ LOG_DISAS("Branch in delay / forbidden slot at PC 0x"
+ TARGET_FMT_lx "\n", ctx->base.pc_next);
+#endif
+ generate_exception_end(ctx, EXCP_RI);
+ return true;
+ }
+
+ /* Load needed operands */
+ TCGv t0 = tcg_temp_new();
+ gen_load_gpr(t0, a->rs);
+
+ if (a->shift) {
+ p += 32;
+ }
+ tcg_gen_andi_tl(t0, t0, 1ULL << p);
+
+ /* Jump conditions */
+ if (a->set) {
+ tcg_gen_setcondi_tl(TCG_COND_NE, bcond, t0, 0);
+ } else {
+ tcg_gen_setcondi_tl(TCG_COND_EQ, bcond, t0, 0);
+ }
+
+ ctx->hflags |= MIPS_HFLAG_BC;
+ ctx->btarget = ctx->base.pc_next + 4 + a->offset * 4;
+ ctx->hflags |= MIPS_HFLAG_BDS32;
+
+ tcg_temp_free(t0);
+ return true;
+}
diff --git a/target/mips/tcg/translate.c b/target/mips/tcg/translate.c
index 6de5b66650..4f41a9b00a 100644
--- a/target/mips/tcg/translate.c
+++ b/target/mips/tcg/translate.c
@@ -15963,6 +15963,11 @@ static void decode_opc(CPUMIPSState *env, DisasContext
*ctx)
if (cpu_supports_isa(env, INSN_VR54XX) && decode_ext_vr54xx(ctx,
ctx->opcode)) {
return;
}
+#if defined(TARGET_MIPS64)
+ if (cpu_supports_isa(env, INSN_OCTEON) && decode_ext_octeon(ctx,
ctx->opcode)) {
+ return;
+ }
+#endif
/* ISA extensions */
if (ase_msa_available(env) && decode_ase_msa(ctx, ctx->opcode)) {
diff --git a/target/mips/tcg/translate.h b/target/mips/tcg/translate.h
index 9997fe2f3c..55053226ae 100644
--- a/target/mips/tcg/translate.h
+++ b/target/mips/tcg/translate.h
@@ -215,6 +215,7 @@ bool decode_ase_msa(DisasContext *ctx, uint32_t insn);
bool decode_ext_txx9(DisasContext *ctx, uint32_t insn);
#if defined(TARGET_MIPS64)
bool decode_ext_tx79(DisasContext *ctx, uint32_t insn);
+bool decode_ext_octeon(DisasContext *ctx, uint32_t insn);
#endif
bool decode_ext_vr54xx(DisasContext *ctx, uint32_t insn);