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RISC-V: Adding XTheadBb ISA extension 

This patch adds support for the XTheadBb ISA extension.
The patch uses the T-Head specific decoder and translation.

Co-developed-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Co-developed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
Message-Id: <20230131202013.2541053-5-christoph.muellner@vrull.eu>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Christoph Müllner 2023-01-31 21:20:03 +01:00 committed by Alistair Francis
parent c9410a689f
commit 426c049196
5 changed files with 149 additions and 2 deletions
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2
target/riscv/cpu.c
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@ -110,6 +110,7 @@ static const struct isa_ext_data isa_edata_arr[] = {
ISA_EXT_DATA_ENTRY(svnapot, true, PRIV_VERSION_1_12_0, ext_svnapot),
ISA_EXT_DATA_ENTRY(svpbmt, true, PRIV_VERSION_1_12_0, ext_svpbmt),
ISA_EXT_DATA_ENTRY(xtheadba, true, PRIV_VERSION_1_11_0, ext_xtheadba),
ISA_EXT_DATA_ENTRY(xtheadbb, true, PRIV_VERSION_1_11_0, ext_xtheadbb),
ISA_EXT_DATA_ENTRY(xtheadcmo, true, PRIV_VERSION_1_11_0, ext_xtheadcmo),
ISA_EXT_DATA_ENTRY(xtheadsync, true, PRIV_VERSION_1_11_0, ext_xtheadsync),
ISA_EXT_DATA_ENTRY(xventanacondops, true, PRIV_VERSION_1_12_0, ext_XVentanaCondOps),
@ -1092,6 +1093,7 @@ static Property riscv_cpu_extensions[] = {
/* Vendor-specific custom extensions */
DEFINE_PROP_BOOL("xtheadba", RISCVCPU, cfg.ext_xtheadba, false),
DEFINE_PROP_BOOL("xtheadbb", RISCVCPU, cfg.ext_xtheadbb, false),
DEFINE_PROP_BOOL("xtheadcmo", RISCVCPU, cfg.ext_xtheadcmo, false),
DEFINE_PROP_BOOL("xtheadsync", RISCVCPU, cfg.ext_xtheadsync, false),
DEFINE_PROP_BOOL("xventanacondops", RISCVCPU, cfg.ext_XVentanaCondOps, false),

1
target/riscv/cpu.h
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@ -474,6 +474,7 @@ struct RISCVCPUConfig {
/* Vendor-specific custom extensions */
bool ext_xtheadba;
bool ext_xtheadbb;
bool ext_xtheadcmo;
bool ext_xtheadsync;
bool ext_XVentanaCondOps;

124
target/riscv/insn_trans/trans_xthead.c.inc
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@ -22,6 +22,12 @@
} \
} while (0)
#define REQUIRE_XTHEADBB(ctx) do { \
if (!ctx->cfg_ptr->ext_xtheadbb) { \
return false; \
} \
} while (0)
#define REQUIRE_XTHEADCMO(ctx) do { \
if (!ctx->cfg_ptr->ext_xtheadcmo) { \
return false; \
@ -67,6 +73,124 @@ GEN_TRANS_TH_ADDSL(1)
GEN_TRANS_TH_ADDSL(2)
GEN_TRANS_TH_ADDSL(3)
/* XTheadBb */
/* th.srri is an alternate encoding for rori (from Zbb) */
static bool trans_th_srri(DisasContext *ctx, arg_th_srri * a)
{
REQUIRE_XTHEADBB(ctx);
return gen_shift_imm_fn_per_ol(ctx, a, EXT_NONE,
tcg_gen_rotri_tl, gen_roriw, NULL);
}
/* th.srriw is an alternate encoding for roriw (from Zbb) */
static bool trans_th_srriw(DisasContext *ctx, arg_th_srriw *a)
{
REQUIRE_XTHEADBB(ctx);
REQUIRE_64BIT(ctx);
ctx->ol = MXL_RV32;
return gen_shift_imm_fn(ctx, a, EXT_NONE, gen_roriw, NULL);
}
/* th.ext and th.extu perform signed/unsigned bitfield extraction */
static bool gen_th_bfextract(DisasContext *ctx, arg_th_bfext *a,
void (*f)(TCGv, TCGv, unsigned int, unsigned int))
{
TCGv dest = dest_gpr(ctx, a->rd);
TCGv source = get_gpr(ctx, a->rs1, EXT_ZERO);
if (a->lsb <= a->msb) {
f(dest, source, a->lsb, a->msb - a->lsb + 1);
gen_set_gpr(ctx, a->rd, dest);
}
return true;
}
static bool trans_th_ext(DisasContext *ctx, arg_th_ext *a)
{
REQUIRE_XTHEADBB(ctx);
return gen_th_bfextract(ctx, a, tcg_gen_sextract_tl);
}
static bool trans_th_extu(DisasContext *ctx, arg_th_extu *a)
{
REQUIRE_XTHEADBB(ctx);
return gen_th_bfextract(ctx, a, tcg_gen_extract_tl);
}
/* th.ff0: find first zero (clz on an inverted input) */
static bool gen_th_ff0(DisasContext *ctx, arg_th_ff0 *a, DisasExtend ext)
{
TCGv dest = dest_gpr(ctx, a->rd);
TCGv src1 = get_gpr(ctx, a->rs1, ext);
int olen = get_olen(ctx);
TCGv t = tcg_temp_new();
tcg_gen_not_tl(t, src1);
if (olen != TARGET_LONG_BITS) {
if (olen == 32) {
gen_clzw(dest, t);
} else {
g_assert_not_reached();
}
} else {
gen_clz(dest, t);
}
tcg_temp_free(t);
gen_set_gpr(ctx, a->rd, dest);
return true;
}
static bool trans_th_ff0(DisasContext *ctx, arg_th_ff0 *a)
{
REQUIRE_XTHEADBB(ctx);
return gen_th_ff0(ctx, a, EXT_NONE);
}
/* th.ff1 is an alternate encoding for clz (from Zbb) */
static bool trans_th_ff1(DisasContext *ctx, arg_th_ff1 *a)
{
REQUIRE_XTHEADBB(ctx);
return gen_unary_per_ol(ctx, a, EXT_NONE, gen_clz, gen_clzw);
}
static void gen_th_revw(TCGv ret, TCGv arg1)
{
tcg_gen_bswap32_tl(ret, arg1, TCG_BSWAP_OS);
}
/* th.rev is an alternate encoding for the RV64 rev8 (from Zbb) */
static bool trans_th_rev(DisasContext *ctx, arg_th_rev *a)
{
REQUIRE_XTHEADBB(ctx);
return gen_unary_per_ol(ctx, a, EXT_NONE, tcg_gen_bswap_tl, gen_th_revw);
}
/* th.revw is a sign-extended byte-swap of the lower word */
static bool trans_th_revw(DisasContext *ctx, arg_th_revw *a)
{
REQUIRE_XTHEADBB(ctx);
REQUIRE_64BIT(ctx);
return gen_unary(ctx, a, EXT_NONE, gen_th_revw);
}
/* th.tstnbz is equivalent to an orc.b (from Zbb) with inverted result */
static void gen_th_tstnbz(TCGv ret, TCGv source1)
{
gen_orc_b(ret, source1);
tcg_gen_not_tl(ret, ret);
}
static bool trans_th_tstnbz(DisasContext *ctx, arg_th_tstnbz *a)
{
REQUIRE_XTHEADBB(ctx);
return gen_unary(ctx, a, EXT_ZERO, gen_th_tstnbz);
}
/* XTheadCmo */
static inline int priv_level(DisasContext *ctx)

4
target/riscv/translate.c
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@ -132,8 +132,8 @@ static bool always_true_p(DisasContext *ctx __attribute__((__unused__)))
static bool has_xthead_p(DisasContext *ctx __attribute__((__unused__)))
{
return ctx->cfg_ptr->ext_xtheadba || ctx->cfg_ptr->ext_xtheadcmo ||
ctx->cfg_ptr->ext_xtheadsync;
return ctx->cfg_ptr->ext_xtheadba || ctx->cfg_ptr->ext_xtheadbb ||
ctx->cfg_ptr->ext_xtheadcmo || ctx->cfg_ptr->ext_xtheadsync;
}
#define MATERIALISE_EXT_PREDICATE(ext) \

20
target/riscv/xthead.decode
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@ -13,14 +13,23 @@
%rd 7:5
%rs1 15:5
%rs2 20:5
%sh5 20:5
%sh6 20:6
# Argument sets
&r rd rs1 rs2 !extern
&r2 rd rs1 !extern
&shift shamt rs1 rd !extern
&th_bfext msb lsb rs1 rd
# Formats
@sfence_vm ....... ..... ..... ... ..... ....... %rs1
@rs2_s ....... ..... ..... ... ..... ....... %rs2 %rs1
@r ....... ..... ..... ... ..... ....... &r %rs2 %rs1 %rd
@r2 ....... ..... ..... ... ..... ....... &r2 %rs1 %rd
@th_bfext msb:6 lsb:6 ..... ... ..... ....... &th_bfext %rs1 %rd
@sh5 ....... ..... ..... ... ..... ....... &shift shamt=%sh5 %rs1 %rd
@sh6 ...... ...... ..... ... ..... ....... &shift shamt=%sh6 %rs1 %rd
# XTheadBa
# Instead of defining a new encoding, we simply use the decoder to
@ -38,6 +47,17 @@ th_addsl1 0000001 ..... ..... 001 ..... 0001011 @r
th_addsl2 0000010 ..... ..... 001 ..... 0001011 @r
th_addsl3 0000011 ..... ..... 001 ..... 0001011 @r
# XTheadBb
th_ext ...... ...... ..... 010 ..... 0001011 @th_bfext
th_extu ...... ...... ..... 011 ..... 0001011 @th_bfext
th_ff0 1000010 00000 ..... 001 ..... 0001011 @r2
th_ff1 1000011 00000 ..... 001 ..... 0001011 @r2
th_srri 000100 ...... ..... 001 ..... 0001011 @sh6
th_srriw 0001010 ..... ..... 001 ..... 0001011 @sh5
th_rev 1000001 00000 ..... 001 ..... 0001011 @r2
th_revw 1001000 00000 ..... 001 ..... 0001011 @r2
th_tstnbz 1000000 00000 ..... 001 ..... 0001011 @r2
# XTheadCmo
th_dcache_call 0000000 00001 00000 000 00000 0001011
th_dcache_ciall 0000000 00011 00000 000 00000 0001011