tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
csky: System Call
This patch adds files related to syscall.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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arch/csky/include/asm/syscall.h
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arch/csky/include/asm/syscall.h
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SYSCALL_H
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#define __ASM_SYSCALL_H
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <abi/regdef.h>
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static inline int
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syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
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{
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return regs_syscallid(regs);
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}
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static inline void
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syscall_rollback(struct task_struct *task, struct pt_regs *regs)
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{
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regs->a0 = regs->orig_a0;
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}
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static inline long
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syscall_get_error(struct task_struct *task, struct pt_regs *regs)
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{
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unsigned long error = regs->a0;
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return IS_ERR_VALUE(error) ? error : 0;
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}
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static inline long
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syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
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{
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return regs->a0;
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}
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static inline void
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syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
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int error, long val)
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{
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regs->a0 = (long) error ?: val;
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}
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static inline void
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syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
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unsigned int i, unsigned int n, unsigned long *args)
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{
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BUG_ON(i + n > 6);
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if (i == 0) {
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args[0] = regs->orig_a0;
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args++;
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i++;
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n--;
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}
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memcpy(args, ®s->a1 + i * sizeof(regs->a1), n * sizeof(args[0]));
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}
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static inline void
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syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
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unsigned int i, unsigned int n, const unsigned long *args)
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{
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BUG_ON(i + n > 6);
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if (i == 0) {
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regs->orig_a0 = args[0];
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args++;
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i++;
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n--;
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}
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memcpy(®s->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0));
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}
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#endif /* __ASM_SYSCALL_H */
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arch/csky/include/asm/syscalls.h
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arch/csky/include/asm/syscalls.h
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/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_SYSCALLS_H
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#define __ASM_CSKY_SYSCALLS_H
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#include <asm-generic/syscalls.h>
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long sys_cacheflush(void __user *, unsigned long, int);
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long sys_set_thread_area(unsigned long addr);
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long sys_csky_fadvise64_64(int fd, int advice, loff_t offset, loff_t len);
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#endif /* __ASM_CSKY_SYSCALLS_H */
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arch/csky/include/uapi/asm/unistd.h
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arch/csky/include/uapi/asm/unistd.h
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/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#define __ARCH_WANT_SYS_CLONE
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#include <asm-generic/unistd.h>
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#define __NR_set_thread_area (__NR_arch_specific_syscall + 0)
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__SYSCALL(__NR_set_thread_area, sys_set_thread_area)
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#define __NR_cacheflush (__NR_arch_specific_syscall + 1)
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__SYSCALL(__NR_cacheflush, sys_cacheflush)
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arch/csky/kernel/syscall.c
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arch/csky/kernel/syscall.c
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/syscalls.h>
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SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
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{
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struct thread_info *ti = task_thread_info(current);
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struct pt_regs *reg = current_pt_regs();
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reg->tls = addr;
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ti->tp_value = addr;
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return 0;
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}
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SYSCALL_DEFINE6(mmap2,
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unsigned long, addr,
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unsigned long, len,
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unsigned long, prot,
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unsigned long, flags,
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unsigned long, fd,
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off_t, offset)
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{
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if (unlikely(offset & (~PAGE_MASK >> 12)))
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return -EINVAL;
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return ksys_mmap_pgoff(addr, len, prot, flags, fd,
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offset >> (PAGE_SHIFT - 12));
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}
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/*
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* for abiv1 the 64bits args should be even th, So we need mov the advice
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* forward.
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*/
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SYSCALL_DEFINE4(csky_fadvise64_64,
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int, fd,
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int, advice,
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loff_t, offset,
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loff_t, len)
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{
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return ksys_fadvise64_64(fd, offset, len, advice);
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}
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arch/csky/kernel/syscall_table.c
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arch/csky/kernel/syscall_table.c
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/syscalls.h>
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#include <asm/syscalls.h>
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#undef __SYSCALL
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#define __SYSCALL(nr, call)[nr] = (call),
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#define sys_fadvise64_64 sys_csky_fadvise64_64
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void * const sys_call_table[__NR_syscalls] __page_aligned_data = {
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[0 ... __NR_syscalls - 1] = sys_ni_syscall,
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#include <asm/unistd.h>
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};