[PATCH V2] RISC-V Implement Ztso extension
shihua@iscas.ac.cn
shihua@iscas.ac.cn
Sat Sep 17 10:03:00 GMT 2022
From: Liao Shihua <shihua@iscas.ac.cn>
This patch support ZTSO extension. It will turn on the tso flag for elf_flags once we have enabled Ztso extension.
This is intended to implement v0.1 of the proposed specification which can be found in Chapter 25 of https://github.com/riscv/riscv-isa-manual/releases/download/draft-20220723-10eea63/riscv-spec.pdf.
bfd\ChangeLog:
* elfnn-riscv.c (_bfd_riscv_elf_merge_private_bfd_data):Set TSO flag.
* elfxx-riscv.c (riscv_multi_subset_supports): Add handling for new instruction class.
binutils\ChangeLog:
* readelf.c (get_machine_flags):Set TSO flag.
gas\ChangeLog:
* config/tc-riscv.c (struct riscv_set_options):Set TSO flag.
(riscv_set_tso):Set TSO flag.
(riscv_set_arch):Set TSO flag.
* testsuite/gas/riscv/attribute-015.d: New test.
include\ChangeLog:
* elf/riscv.h (EF_RISCV_TSO):Define TSO bit.
* opcode/riscv.h (enum riscv_insn_class):Add Ztso's INSN CLASS.
---
bfd/elfnn-riscv.c | 3 +++
bfd/elfxx-riscv.c | 5 +++++
binutils/readelf.c | 3 +++
gas/config/tc-riscv.c | 18 ++++++++++++++++++
gas/testsuite/gas/riscv/attribute-015.d | 6 ++++++
include/elf/riscv.h | 3 +++
include/opcode/riscv.h | 1 +
7 files changed, 39 insertions(+)
create mode 100644 gas/testsuite/gas/riscv/attribute-015.d
diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c
index 0e0a0b09e24..3d2ddf4e651 100644
--- a/bfd/elfnn-riscv.c
+++ b/bfd/elfnn-riscv.c
@@ -3872,6 +3872,9 @@ _bfd_riscv_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
/* Allow linking RVC and non-RVC, and keep the RVC flag. */
elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_RVC;
+ /* Allow linking TSO and non-TSO, and keep the TSO flag. */
+ elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_TSO;
+
return true;
fail:
diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
index e03b312a381..a0630d4c183 100644
--- a/bfd/elfxx-riscv.c
+++ b/bfd/elfxx-riscv.c
@@ -1204,6 +1204,7 @@ static struct riscv_supported_ext riscv_supported_std_z_ext[] =
{"zvl16384b", ISA_SPEC_CLASS_DRAFT, 1, 0, 0 },
{"zvl32768b", ISA_SPEC_CLASS_DRAFT, 1, 0, 0 },
{"zvl65536b", ISA_SPEC_CLASS_DRAFT, 1, 0, 0 },
+ {"ztso", ISA_SPEC_CLASS_DRAFT, 0, 1, 0 },
{NULL, 0, 0, 0, 0}
};
@@ -2376,6 +2377,8 @@ riscv_multi_subset_supports (riscv_parse_subset_t *rps,
|| riscv_subset_supports (rps, "zve64d")
|| riscv_subset_supports (rps, "zve64f")
|| riscv_subset_supports (rps, "zve32f"));
+ case INSN_CLASS_ZTSO:
+ return riscv_subset_supports (rps, "ztso");
case INSN_CLASS_SVINVAL:
return riscv_subset_supports (rps, "svinval");
case INSN_CLASS_H:
@@ -2503,6 +2506,8 @@ riscv_multi_subset_supports_ext (riscv_parse_subset_t *rps,
return _("v' or `zve64x' or `zve32x");
case INSN_CLASS_ZVEF:
return _("v' or `zve64d' or `zve64f' or `zve32f");
+ case INSN_CLASS_ZTSO:
+ return "ztso";
case INSN_CLASS_SVINVAL:
return "svinval";
case INSN_CLASS_H:
diff --git a/binutils/readelf.c b/binutils/readelf.c
index cafba9a4f56..b1dbcad06f5 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -4079,6 +4079,9 @@ get_machine_flags (Filedata * filedata, unsigned e_flags, unsigned e_machine)
if (e_flags & EF_RISCV_RVE)
strcat (buf, ", RVE");
+ if (e_flags & EF_RISCV_TSO)
+ strcat (buf, ", TSO");
+
switch (e_flags & EF_RISCV_FLOAT_ABI)
{
case EF_RISCV_FLOAT_ABI_SOFT:
diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
index 2f5ee18e451..8806b455d1b 100644
--- a/gas/config/tc-riscv.c
+++ b/gas/config/tc-riscv.c
@@ -234,6 +234,7 @@ struct riscv_set_options
int relax; /* Emit relocs the linker is allowed to relax. */
int arch_attr; /* Emit architecture and privileged elf attributes. */
int csr_check; /* Enable the CSR checking. */
+ int tso; /* Use tso model. */
};
static struct riscv_set_options riscv_opts =
@@ -243,6 +244,7 @@ static struct riscv_set_options riscv_opts =
1, /* relax */
DEFAULT_RISCV_ATTR, /* arch_attr */
0, /* csr_check */
+ 0, /* tso */
};
/* Enable or disable the rvc flags for riscv_opts. Turn on the rvc flag
@@ -257,6 +259,18 @@ riscv_set_rvc (bool rvc_value)
riscv_opts.rvc = rvc_value;
}
+/* Enable or disable the tso flags for riscv_opts. Turn on the tso flag
+ for elf_flags once we have enabled ztso extension. */
+
+static void
+riscv_set_tso (bool tso_value)
+{
+ if (tso_value)
+ elf_flags |= EF_RISCV_TSO;
+
+ riscv_opts.tso = tso_value;
+}
+
/* This linked list records all enabled extensions, which are parsed from
the architecture string. The architecture string can be set by the
-march option, the elf architecture attributes, and the --with-arch
@@ -307,6 +321,10 @@ riscv_set_arch (const char *s)
riscv_set_rvc (false);
if (riscv_subset_supports (&riscv_rps_as, "c"))
riscv_set_rvc (true);
+
+ riscv_set_tso (false);
+ if (riscv_subset_supports (&riscv_rps_as, "ztso"))
+ riscv_set_tso (true);
}
/* Indicate -mabi option is explictly set. */
diff --git a/gas/testsuite/gas/riscv/attribute-015.d b/gas/testsuite/gas/riscv/attribute-015.d
new file mode 100644
index 00000000000..73fc85b97ab
--- /dev/null
+++ b/gas/testsuite/gas/riscv/attribute-015.d
@@ -0,0 +1,6 @@
+#as: -march=rv32i_ztso -march-attr
+#readelf: -A
+#source: empty.s
+Attribute Section: riscv
+File Attributes
+ Tag_RISCV_arch: "rv32i2p0_ztso0p1"
diff --git a/include/elf/riscv.h b/include/elf/riscv.h
index 9b3ea376ff3..d7b5c09d5c3 100644
--- a/include/elf/riscv.h
+++ b/include/elf/riscv.h
@@ -121,6 +121,9 @@ END_RELOC_NUMBERS (R_RISCV_max)
/* RISC-V specific values for st_other. */
#define STO_RISCV_VARIANT_CC 0x80
+/* File uses the TSO model. */
+#define EF_RISCV_TSO 0x0010
+
/* Additional section types. */
#define SHT_RISCV_ATTRIBUTES 0x70000003 /* Section holds attributes. */
diff --git a/include/opcode/riscv.h b/include/opcode/riscv.h
index f1dabeaab8e..173b98d98be 100644
--- a/include/opcode/riscv.h
+++ b/include/opcode/riscv.h
@@ -398,6 +398,7 @@ enum riscv_insn_class
INSN_CLASS_ZICBOP,
INSN_CLASS_ZICBOZ,
INSN_CLASS_H,
+ INSN_CLASS_ZTSO,
};
/* This structure holds information for a particular instruction. */
--
2.17.1
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