arm64: Implement the compat_sys_call_table in C

[firefly-linux-kernel-4.4.55.git] / arch / arm64 / kernel / entry32.S

diff --git a/arch/arm64/kernel/entry32.S b/arch/arm64/kernel/entry32.S
new file mode 100644 (file)
index 0000000..9a8f6ae
--- /dev/null
+++ b/arch/arm64/kernel/entry32.S
@@ -0,0 +1,105 @@
+/*
+ * Compat system call wrappers
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Authors: Will Deacon <will.deacon@arm.com>
+ *         Catalin Marinas <catalin.marinas@arm.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 <asm/assembler.h>
+#include <asm/asm-offsets.h>
+
+/*
+ * System call wrappers for the AArch32 compatibility layer.
+ */
+
+ENTRY(compat_sys_sigreturn_wrapper)
+       mov     x0, sp
+       mov     x27, #0         // prevent syscall restart handling (why)
+       b       compat_sys_sigreturn
+ENDPROC(compat_sys_sigreturn_wrapper)
+
+ENTRY(compat_sys_rt_sigreturn_wrapper)
+       mov     x0, sp
+       mov     x27, #0         // prevent syscall restart handling (why)
+       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)
+
+/*
+ * 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)