Unverified Commit 59c10c52 authored by Guo Ren's avatar Guo Ren Committed by Palmer Dabbelt
Browse files

riscv: compat: syscall: Add compat_sys_call_table implementation 



Implement compat sys_call_table and some system call functions:
truncate64, ftruncate64, fallocate, pread64, pwrite64,
sync_file_range, readahead, fadvise64_64 which need argument
translation.

Signed-off-by: default avatarGuo Ren <guoren@linux.alibaba.com>
Signed-off-by: default avatarGuo Ren <guoren@kernel.org>
Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
Tested-by: default avatarHeiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220405071314.3225832-12-guoren@kernel.org


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 01abdfea

arch/riscv/include/asm/syscall.h

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 


/* The array of function pointers for syscalls. */

extern void * const sys_call_table[];

extern void * const compat_sys_call_table[];



/*

 * Only the low 32 bits of orig_r0 are meaningful, so we return int.

arch/riscv/include/asm/unistd.h

+11 −0
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@@ -11,6 +11,17 @@ 
#define __ARCH_WANT_SYS_CLONE

#define __ARCH_WANT_MEMFD_SECRET



#ifdef CONFIG_COMPAT

#define __ARCH_WANT_COMPAT_TRUNCATE64

#define __ARCH_WANT_COMPAT_FTRUNCATE64

#define __ARCH_WANT_COMPAT_FALLOCATE

#define __ARCH_WANT_COMPAT_PREAD64

#define __ARCH_WANT_COMPAT_PWRITE64

#define __ARCH_WANT_COMPAT_SYNC_FILE_RANGE

#define __ARCH_WANT_COMPAT_READAHEAD

#define __ARCH_WANT_COMPAT_FADVISE64_64

#endif



#include <uapi/asm/unistd.h>



#define NR_syscalls (__NR_syscalls)

arch/riscv/include/uapi/asm/unistd.h

+1 −1
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@@ -15,7 +15,7 @@ 
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.

 */



#ifdef __LP64__

#if defined(__LP64__) && !defined(__SYSCALL_COMPAT)

#define __ARCH_WANT_NEW_STAT

#define __ARCH_WANT_SET_GET_RLIMIT

#endif /* __LP64__ */

arch/riscv/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -69,3 +69,4 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o 
obj-$(CONFIG_JUMP_LABEL)	+= jump_label.o



obj-$(CONFIG_EFI)		+= efi.o

obj-$(CONFIG_COMPAT)		+= compat_syscall_table.o

arch/riscv/kernel/compat_syscall_table.c

0 → 100644
+19 −0
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// SPDX-License-Identifier: GPL-2.0-only



#define __SYSCALL_COMPAT



#include <linux/compat.h>

#include <linux/syscalls.h>

#include <asm-generic/mman-common.h>

#include <asm-generic/syscalls.h>

#include <asm/syscall.h>



#undef __SYSCALL

#define __SYSCALL(nr, call)      [nr] = (call),



asmlinkage long compat_sys_rt_sigreturn(void);



void * const compat_sys_call_table[__NR_syscalls] = {

	[0 ... __NR_syscalls - 1] = sys_ni_syscall,

#include <asm/unistd.h>

};