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authorArnaldo Carvalho de Melo <acme@redhat.com>2019-04-22 21:21:35 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-05-02 23:00:20 +0300
commit18f90d372cf35b387663f1567de701e5393f6eb5 (patch)
tree99e3d79ea31af81802c5844c99867bf174747e81 /tools/arch/riscv
parentc638417e1a64b1f43ebab589e697d1cd1a127a74 (diff)
downloadlinux-18f90d372cf35b387663f1567de701e5393f6eb5.tar.xz
tools arch uapi: Copy missing unistd.h headers for arc, hexagon and riscv
Since those were introduced in: c8ce48f06503 ("asm-generic: Make time32 syscall numbers optional") But when the asm-generic/unistd.h was sync'ed with tools/ in: 1a787fc5ba18 ("tools headers uapi: Sync copy of asm-generic/unistd.h with the kernel sources") I forgot to copy the files for the architectures that define __ARCH_WANT_TIME32_SYSCALLS, so the perf build was breaking there, as reported by Vineet Gupta for the ARC architecture. After updating my ARC container to use the glibc based toolchain + cross building libnuma, zlib and elfutils, I finally managed to reproduce the problem and verify that this now is fixed and will not regress as will be tested before each pull req sent upstream. Reported-by: Vineet Gupta <Vineet.Gupta1@synopsys.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Jiri Olsa <jolsa@kernel.org> CC: linux-snps-arc@lists.infradead.org Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/r/20190426193531.GC28586@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/arch/riscv')
-rw-r--r--tools/arch/riscv/include/uapi/asm/unistd.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/tools/arch/riscv/include/uapi/asm/unistd.h b/tools/arch/riscv/include/uapi/asm/unistd.h
new file mode 100644
index 000000000000..0e2eeeb1fd27
--- /dev/null
+++ b/tools/arch/riscv/include/uapi/asm/unistd.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2018 David Abdurachmanov <david.abdurachmanov@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef __LP64__
+#define __ARCH_WANT_NEW_STAT
+#define __ARCH_WANT_SET_GET_RLIMIT
+#endif /* __LP64__ */
+
+#include <asm-generic/unistd.h>
+
+/*
+ * Allows the instruction cache to be flushed from userspace. Despite RISC-V
+ * having a direct 'fence.i' instruction available to userspace (which we
+ * can't trap!), that's not actually viable when running on Linux because the
+ * kernel might schedule a process on another hart. There is no way for
+ * userspace to handle this without invoking the kernel (as it doesn't know the
+ * thread->hart mappings), so we've defined a RISC-V specific system call to
+ * flush the instruction cache.
+ *
+ * __NR_riscv_flush_icache is defined to flush the instruction cache over an
+ * address range, with the flush applying to either all threads or just the
+ * caller. We don't currently do anything with the address range, that's just
+ * in there for forwards compatibility.
+ */
+#ifndef __NR_riscv_flush_icache
+#define __NR_riscv_flush_icache (__NR_arch_specific_syscall + 15)
+#endif
+__SYSCALL(__NR_riscv_flush_icache, sys_riscv_flush_icache)