From f1bdc63a898f2fa164e79528c03e96a21a779e82 Mon Sep 17 00:00:00 2001
From: Andrew Waterman <andrew@sifive.com>
Date: Tue, 2 Jan 2018 20:34:01 +0000
Subject: [PATCH] RISC-V: Fix for icache flush issue on multicore processors.
gcc/
* config/riscv/linux.h (ICACHE_FLUSH_FUNC): New.
* config/riscv/riscv.md (clear_cache): Use it.
From-SVN: r256109
---
gcc/ChangeLog | 5 +++++
gcc/config/riscv/linux.h | 2 ++
gcc/config/riscv/riscv.md | 6 ++++++
3 files changed, 13 insertions(+)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 403c46ff3444..4e5323c68fec 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2018-01-02 Andrew Waterman <andrew@sifive.com>
+
+ * config/riscv/linux.h (ICACHE_FLUSH_FUNC): New.
+ * config/riscv/riscv.md (clear_cache): Use it.
+
2018-01-02 Artyom Skrobov <tyomitch@gmail.com>
* web.c: Remove out-of-date comment.
diff --git a/gcc/config/riscv/linux.h b/gcc/config/riscv/linux.h
index 6c7e3c4e819f..4b2f7b6e1fdb 100644
--- a/gcc/config/riscv/linux.h
+++ b/gcc/config/riscv/linux.h
@@ -45,6 +45,8 @@ along with GCC; see the file COPYING3. If not see
#define LIB_SPEC GNU_USER_TARGET_LIB_SPEC " -latomic "
#endif
+#define ICACHE_FLUSH_FUNC "__riscv_flush_icache"
+
#define LINK_SPEC "\
-melf" XLEN_SPEC "lriscv \
%{shared} \
diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md
index db4fed48e539..dab54ad2738a 100644
--- a/gcc/config/riscv/riscv.md
+++ b/gcc/config/riscv/riscv.md
@@ -1456,7 +1456,13 @@
(match_operand 1 "pmode_register_operand")]
""
{
+#ifdef ICACHE_FLUSH_FUNC
+ emit_library_call (gen_rtx_SYMBOL_REF (Pmode, ICACHE_FLUSH_FUNC),
+ LCT_NORMAL, VOIDmode, operands[0], Pmode,
+ operands[1], Pmode, const0_rtx, Pmode);
+#else
emit_insn (gen_fence_i ());
+#endif
DONE;
})
--
GitLab