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Message-Id: <20170619155003.13218-14-ynorov@caviumnetworks.com>
Date: Mon, 19 Jun 2017 18:49:56 +0300
From: Yury Norov <ynorov@...iumnetworks.com>
To: Catalin Marinas <catalin.marinas@....com>,
Arnd Bergmann <arnd@...db.de>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org
Cc: Yury Norov <ynorov@...iumnetworks.com>,
Adam Borowski <kilobyte@...band.pl>,
Andreas Schwab <schwab@...e.de>,
Andrew Pinski <pinskia@...il.com>,
Bamvor Zhangjian <bamvor.zhangjian@...wei.com>,
Chris Metcalf <cmetcalf@...hip.com>,
Chris Metcalf <cmetcalf@...lanox.com>,
Florian Weimer <fweimer@...hat.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
James Hogan <james.hogan@...tec.com>,
James Morse <james.morse@....com>,
Joseph Myers <joseph@...esourcery.com>,
Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
Nathan_Lynch@...tor.com, Prasun.Kapoor@...iumnetworks.com,
Ramana Radhakrishnan <ramana.gcc@...glemail.com>,
Steve Ellcey <sellcey@...iumnetworks.com>,
Alexander Graf <agraf@...e.de>,
Mark Brown <broonie@...nel.org>,
christoph.muellner@...obroma-systems.com, davem@...emloft.net,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Alexey Klimov <klimov.linux@...il.com>, linyongting@...wei.com,
manuel.montezelo@...il.com, philipp.tomsich@...obroma-systems.com,
schwidefsky@...ibm.com, szabolcs.nagy@....com,
zhouchengming1@...wei.com
Subject: [PATCH 13/20] arm64: ilp32: share aarch32 syscall handlers
According to userspace/kernel ABI, userspace off_t is passed in register pair
just like in aarch32. In this patch corresponding aarch32 handlers
are shared to ilp32 code.
Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
---
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/entry32.S | 80 ---------------------------
arch/arm64/kernel/entry32_common.S | 107 +++++++++++++++++++++++++++++++++++++
3 files changed, 108 insertions(+), 80 deletions(-)
create mode 100644 arch/arm64/kernel/entry32_common.S
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 41d9a3ab07a7..7243ffe358b4 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -30,6 +30,7 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE
arm64-obj-$(CONFIG_AARCH32_EL0) += sys32.o kuser32.o signal32.o \
sys_compat.o entry32.o binfmt_elf32.o
arm64-obj-$(CONFIG_ARM64_ILP32) += binfmt_ilp32.o
+arm64-obj-$(CONFIG_COMPAT) += entry32_common.o
arm64-obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o entry-ftrace.o
arm64-obj-$(CONFIG_MODULES) += arm64ksyms.o module.o
arm64-obj-$(CONFIG_ARM64_MODULE_PLTS) += module-plts.o
diff --git a/arch/arm64/kernel/entry32.S b/arch/arm64/kernel/entry32.S
index f332d5d1f6b4..4bede0324440 100644
--- a/arch/arm64/kernel/entry32.S
+++ b/arch/arm64/kernel/entry32.S
@@ -39,83 +39,3 @@ ENTRY(compat_sys_rt_sigreturn_wrapper)
mov x0, sp
b compat_sys_rt_sigreturn
ENDPROC(compat_sys_rt_sigreturn_wrapper)
-
-ENTRY(compat_sys_statfs64_wrapper)
- mov w3, #84
- cmp w1, #88
- csel w1, w3, w1, eq
- b compat_sys_statfs64
-ENDPROC(compat_sys_statfs64_wrapper)
-
-ENTRY(compat_sys_fstatfs64_wrapper)
- mov w3, #84
- cmp w1, #88
- csel w1, w3, w1, eq
- b compat_sys_fstatfs64
-ENDPROC(compat_sys_fstatfs64_wrapper)
-
-/*
- * Note: off_4k (w5) is always in units of 4K. If we can't do the
- * requested offset because it is not page-aligned, we return -EINVAL.
- */
-ENTRY(compat_sys_mmap2_wrapper)
-#if PAGE_SHIFT > 12
- tst w5, #~PAGE_MASK >> 12
- b.ne 1f
- lsr w5, w5, #PAGE_SHIFT - 12
-#endif
- b sys_mmap_pgoff
-1: mov x0, #-EINVAL
- ret
-ENDPROC(compat_sys_mmap2_wrapper)
-
-/*
- * Wrappers for AArch32 syscalls that either take 64-bit parameters
- * in registers or that take 32-bit parameters which require sign
- * extension.
- */
-ENTRY(compat_sys_pread64_wrapper)
- regs_to_64 x3, x4, x5
- b sys_pread64
-ENDPROC(compat_sys_pread64_wrapper)
-
-ENTRY(compat_sys_pwrite64_wrapper)
- regs_to_64 x3, x4, x5
- b sys_pwrite64
-ENDPROC(compat_sys_pwrite64_wrapper)
-
-ENTRY(compat_sys_truncate64_wrapper)
- regs_to_64 x1, x2, x3
- b sys_truncate
-ENDPROC(compat_sys_truncate64_wrapper)
-
-ENTRY(compat_sys_ftruncate64_wrapper)
- regs_to_64 x1, x2, x3
- b sys_ftruncate
-ENDPROC(compat_sys_ftruncate64_wrapper)
-
-ENTRY(compat_sys_readahead_wrapper)
- regs_to_64 x1, x2, x3
- mov w2, w4
- b sys_readahead
-ENDPROC(compat_sys_readahead_wrapper)
-
-ENTRY(compat_sys_fadvise64_64_wrapper)
- mov w6, w1
- regs_to_64 x1, x2, x3
- regs_to_64 x2, x4, x5
- mov w3, w6
- b sys_fadvise64_64
-ENDPROC(compat_sys_fadvise64_64_wrapper)
-
-ENTRY(compat_sys_sync_file_range2_wrapper)
- regs_to_64 x2, x2, x3
- regs_to_64 x3, x4, x5
- b sys_sync_file_range2
-ENDPROC(compat_sys_sync_file_range2_wrapper)
-
-ENTRY(compat_sys_fallocate_wrapper)
- regs_to_64 x2, x2, x3
- regs_to_64 x3, x4, x5
- b sys_fallocate
-ENDPROC(compat_sys_fallocate_wrapper)
diff --git a/arch/arm64/kernel/entry32_common.S b/arch/arm64/kernel/entry32_common.S
new file mode 100644
index 000000000000..f4a5e4de6201
--- /dev/null
+++ b/arch/arm64/kernel/entry32_common.S
@@ -0,0 +1,107 @@
+/*
+ * Compat system call wrappers
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Authors: Will Deacon <will.deacon@....com>
+ * Catalin Marinas <catalin.marinas@....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/>.
+ */
+
+#include <linux/linkage.h>
+#include <linux/const.h>
+
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+#include <asm/errno.h>
+#include <asm/page.h>
+
+/*
+ * Note: off_4k (w5) is always in units of 4K. If we can't do the
+ * requested offset because it is not page-aligned, we return -EINVAL.
+ */
+ENTRY(compat_sys_mmap2_wrapper)
+#if PAGE_SHIFT > 12
+ tst w5, #~PAGE_MASK >> 12
+ b.ne 1f
+ lsr w5, w5, #PAGE_SHIFT - 12
+#endif
+ b sys_mmap_pgoff
+1: mov x0, #-EINVAL
+ ret
+ENDPROC(compat_sys_mmap2_wrapper)
+
+/*
+ * Wrappers for AArch32 syscalls that either take 64-bit parameters
+ * in registers or that take 32-bit parameters which require sign
+ * extension.
+ */
+ENTRY(compat_sys_pread64_wrapper)
+ regs_to_64 x3, x4, x5
+ b sys_pread64
+ENDPROC(compat_sys_pread64_wrapper)
+
+ENTRY(compat_sys_pwrite64_wrapper)
+ regs_to_64 x3, x4, x5
+ b sys_pwrite64
+ENDPROC(compat_sys_pwrite64_wrapper)
+
+ENTRY(compat_sys_truncate64_wrapper)
+ regs_to_64 x1, x2, x3
+ b sys_truncate
+ENDPROC(compat_sys_truncate64_wrapper)
+
+ENTRY(compat_sys_ftruncate64_wrapper)
+ regs_to_64 x1, x2, x3
+ b sys_ftruncate
+ENDPROC(compat_sys_ftruncate64_wrapper)
+
+ENTRY(compat_sys_readahead_wrapper)
+ regs_to_64 x1, x2, x3
+ mov w2, w4
+ b sys_readahead
+ENDPROC(compat_sys_readahead_wrapper)
+
+ENTRY(compat_sys_fadvise64_64_wrapper)
+ mov w6, w1
+ regs_to_64 x1, x2, x3
+ regs_to_64 x2, x4, x5
+ mov w3, w6
+ b sys_fadvise64_64
+ENDPROC(compat_sys_fadvise64_64_wrapper)
+
+ENTRY(compat_sys_sync_file_range2_wrapper)
+ regs_to_64 x2, x2, x3
+ regs_to_64 x3, x4, x5
+ b sys_sync_file_range2
+ENDPROC(compat_sys_sync_file_range2_wrapper)
+
+ENTRY(compat_sys_fallocate_wrapper)
+ regs_to_64 x2, x2, x3
+ regs_to_64 x3, x4, x5
+ b sys_fallocate
+ENDPROC(compat_sys_fallocate_wrapper)
+
+ENTRY(compat_sys_statfs64_wrapper)
+ mov w3, #84
+ cmp w1, #88
+ csel w1, w3, w1, eq
+ b compat_sys_statfs64
+ENDPROC(compat_sys_statfs64_wrapper)
+
+ENTRY(compat_sys_fstatfs64_wrapper)
+ mov w3, #84
+ cmp w1, #88
+ csel w1, w3, w1, eq
+ b compat_sys_fstatfs64
+ENDPROC(compat_sys_fstatfs64_wrapper)
--
2.11.0
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