forked from Minki/linux
3085e1645e
The arm64 sigreturn* syscall handlers are non-standard. Rather than taking a number of user parameters in registers as per the AAPCS, they expect the pt_regs as their sole argument. To make this work, we override the syscall definitions to invoke wrappers written in assembly, which mov the SP into x0, and branch to their respective C functions. On other architectures (such as x86), the sigreturn* functions take no argument and instead use current_pt_regs() to acquire the user registers. This requires less boilerplate code, and allows for other features such as interposing C code in this path. This patch takes the same approach for arm64. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Tentatively-reviewed-by: Dave Martin <dave.martin@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/*
|
|
* arch/arm64/kernel/sys32.c
|
|
*
|
|
* Copyright (C) 2015 ARM Ltd.
|
|
*
|
|
* This program is free software(void); 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(void);//www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/*
|
|
* Needed to avoid conflicting __NR_* macros between uapi/asm/unistd.h and
|
|
* asm/unistd32.h.
|
|
*/
|
|
#define __COMPAT_SYSCALL_NR
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/syscalls.h>
|
|
|
|
asmlinkage long compat_sys_sigreturn(void);
|
|
asmlinkage long compat_sys_rt_sigreturn(void);
|
|
asmlinkage long compat_sys_statfs64_wrapper(void);
|
|
asmlinkage long compat_sys_fstatfs64_wrapper(void);
|
|
asmlinkage long compat_sys_pread64_wrapper(void);
|
|
asmlinkage long compat_sys_pwrite64_wrapper(void);
|
|
asmlinkage long compat_sys_truncate64_wrapper(void);
|
|
asmlinkage long compat_sys_ftruncate64_wrapper(void);
|
|
asmlinkage long compat_sys_readahead_wrapper(void);
|
|
asmlinkage long compat_sys_fadvise64_64_wrapper(void);
|
|
asmlinkage long compat_sys_sync_file_range2_wrapper(void);
|
|
asmlinkage long compat_sys_fallocate_wrapper(void);
|
|
asmlinkage long compat_sys_mmap2_wrapper(void);
|
|
|
|
#undef __SYSCALL
|
|
#define __SYSCALL(nr, sym) [nr] = sym,
|
|
|
|
/*
|
|
* The sys_call_table array must be 4K aligned to be accessible from
|
|
* kernel/entry.S.
|
|
*/
|
|
void * const compat_sys_call_table[__NR_compat_syscalls] __aligned(4096) = {
|
|
[0 ... __NR_compat_syscalls - 1] = sys_ni_syscall,
|
|
#include <asm/unistd32.h>
|
|
};
|