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[PATCH] RISC-V: Fix for icache flush issue on multicore processors.
- From: Jim Wilson <jimw at sifive dot com>
- To: gcc-patches at gcc dot gnu dot org
- Cc: Jim Wilson <jimw at sifive dot com>
- Date: Tue, 2 Jan 2018 13:05:52 -0800
- Subject: [PATCH] RISC-V: Fix for icache flush issue on multicore processors.
- Authentication-results: sourceware.org; auth=none
- References: <20180102205920.667-1-jimw@sifive.com>
The gcc-7-branch version of the patch, tested same as the mainline patch.
Committed.
gcc/
* config/riscv/linux.h (ICACHE_FLUSH_FUNC): New.
* config/riscv/riscv.md (clear_cache): Use it.
---
gcc/config/riscv/linux.h | 2 ++
gcc/config/riscv/riscv.md | 6 ++++++
2 files changed, 8 insertions(+)
diff --git a/gcc/config/riscv/linux.h b/gcc/config/riscv/linux.h
index 6c7e3c4e819..4b2f7b6e1fd 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 c478e03fbbe..5f216d3255b 100644
--- a/gcc/config/riscv/riscv.md
+++ b/gcc/config/riscv/riscv.md
@@ -1429,7 +1429,13 @@
(match_operand 1 "pmode_register_operand")]
""
{
+#ifdef ICACHE_FLUSH_FUNC
+ emit_library_call (gen_rtx_SYMBOL_REF (Pmode, ICACHE_FLUSH_FUNC),
+ LCT_NORMAL, VOIDmode, 3, operands[0], Pmode,
+ operands[1], Pmode, const0_rtx, Pmode);
+#else
emit_insn (gen_fence_i ());
+#endif
DONE;
})
--
2.14.1