From 4053d295fdd81d3e05c4977e3cd9c647e8cc6bc2 Mon Sep 17 00:00:00 2001
From: Tsukasa OI <research_trasio@irq.a4lg.com>
Date: Sat, 12 Aug 2023 00:38:18 +0000
Subject: [PATCH] RISC-V: Add stub support for existing extensions (privileged)

After commit c283c4774d1c ("RISC-V: Throw compilation error for unknown
extensions") changed how do we handle unknown extensions, we have no
guarantee that we can share the same architectural string with Binutils
(specifically, the assembler).

To avoid compilation errors on shared Assembler-C/C++ projects or programs
with inline assembler, GCC should support almost all extensions that
Binutils support, even if the GCC itself does not touch a thing.

As a start, this commit adds stub supported *privileged* extensions to
riscv_ext_version_table and its implications to riscv_implied_info
(all information is copied from Binutils' bfd/elfxx-riscv.c).

gcc/ChangeLog:

	* common/config/riscv/riscv-common.cc
	(riscv_implied_info): Add implications from privileged extensions.
	(riscv_ext_version_table): Add stub support for all privileged
	extensions supported by Binutils.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/predef-29.c: New test for a stub privileged
	extension 'Smstateen' with some implications.
---
 gcc/common/config/riscv/riscv-common.cc    | 18 +++++++++++
 gcc/testsuite/gcc.target/riscv/predef-29.c | 35 ++++++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/riscv/predef-29.c

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index a5b62cda3a09..3502993026d6 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -143,6 +143,14 @@ static const riscv_implied_info_t riscv_implied_info[] =
   {"zcmp", "zca"},
   {"zcmt", "zca"},
 
+  {"smaia", "ssaia"},
+  {"smstateen", "ssstateen"},
+  {"smepmp", "zicsr"},
+  {"ssaia", "zicsr"},
+  {"sscofpmf", "zicsr"},
+  {"ssstateen", "zicsr"},
+  {"sstc", "zicsr"},
+
   {NULL, NULL}
 };
 
@@ -288,8 +296,18 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
   {"zcmp", ISA_SPEC_CLASS_NONE, 1, 0},
   {"zcmt", ISA_SPEC_CLASS_NONE, 1, 0},
 
+  {"smaia",     ISA_SPEC_CLASS_NONE, 1, 0},
+  {"smepmp",    ISA_SPEC_CLASS_NONE, 1, 0},
+  {"smstateen", ISA_SPEC_CLASS_NONE, 1, 0},
+
+  {"ssaia",     ISA_SPEC_CLASS_NONE, 1, 0},
+  {"sscofpmf",  ISA_SPEC_CLASS_NONE, 1, 0},
+  {"ssstateen", ISA_SPEC_CLASS_NONE, 1, 0},
+  {"sstc",      ISA_SPEC_CLASS_NONE, 1, 0},
+
   {"svinval", ISA_SPEC_CLASS_NONE, 1, 0},
   {"svnapot", ISA_SPEC_CLASS_NONE, 1, 0},
+  {"svpbmt",  ISA_SPEC_CLASS_NONE, 1, 0},
 
   {"xtheadba", ISA_SPEC_CLASS_NONE, 1, 0},
   {"xtheadbb", ISA_SPEC_CLASS_NONE, 1, 0},
diff --git a/gcc/testsuite/gcc.target/riscv/predef-29.c b/gcc/testsuite/gcc.target/riscv/predef-29.c
new file mode 100644
index 000000000000..61c6429be558
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/predef-29.c
@@ -0,0 +1,35 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64i_smstateen -mabi=lp64 -mcmodel=medlow -misa-spec=20191213" } */
+
+int main () {
+
+#ifndef __riscv_arch_test
+#error "__riscv_arch_test"
+#endif
+
+#if __riscv_xlen != 64
+#error "__riscv_xlen"
+#endif
+
+#if !defined(__riscv_i) || (__riscv_i != (2 * 1000 * 1000 + 1 * 1000))
+#error "__riscv_i"
+#endif
+
+#if defined(__riscv_e)
+#error "__riscv_e"
+#endif
+
+#if !defined(__riscv_zicsr)
+#error "__riscv_zicsr"
+#endif
+
+#if !defined(__riscv_smstateen)
+#error "__riscv_smstateen"
+#endif
+
+#if !defined(__riscv_ssstateen)
+#error "__riscv_ssstateen"
+#endif
+
+  return 0;
+}
-- 
2.47.3