22feadbe4c
The syscall_rollback function is used by seccomp-bpf but it was never added for MIPS. It doesn't need to do anything as none of the registers are clobbered if the system call has been denied by the seccomp filter. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Reviewed-by: James Hogan <james.hogan@imgtec.com> Reviewed-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6403/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
123 lines
2.5 KiB
C
123 lines
2.5 KiB
C
/*
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* Access to user system call parameters and results
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* See asm-generic/syscall.h for descriptions of what we must do here.
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*
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* Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org>
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*/
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#ifndef __ASM_MIPS_SYSCALL_H
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#define __ASM_MIPS_SYSCALL_H
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#include <linux/audit.h>
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#include <linux/elf-em.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/uaccess.h>
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#include <asm/ptrace.h>
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static inline long syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->regs[2];
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}
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static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
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struct task_struct *task, struct pt_regs *regs, unsigned int n)
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{
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unsigned long usp __maybe_unused = regs->regs[29];
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switch (n) {
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case 0: case 1: case 2: case 3:
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*arg = regs->regs[4 + n];
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return 0;
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#ifdef CONFIG_32BIT
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case 4: case 5: case 6: case 7:
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return get_user(*arg, (int *)usp + 4 * n);
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#endif
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#ifdef CONFIG_64BIT
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case 4: case 5: case 6: case 7:
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#ifdef CONFIG_MIPS32_O32
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if (test_thread_flag(TIF_32BIT_REGS))
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return get_user(*arg, (int *)usp + 4 * n);
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else
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#endif
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*arg = regs->regs[4 + n];
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return 0;
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#endif
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default:
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BUG();
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}
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->regs[2];
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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/* Do nothing */
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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if (error) {
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regs->regs[2] = -error;
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regs->regs[7] = -1;
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} else {
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regs->regs[2] = val;
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regs->regs[7] = 0;
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}
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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unsigned long arg;
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int ret;
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while (n--)
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ret |= mips_get_syscall_arg(&arg, task, regs, i++);
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/*
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* No way to communicate an error because this is a void function.
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*/
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#if 0
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return ret;
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#endif
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}
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extern const unsigned long sys_call_table[];
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extern const unsigned long sys32_call_table[];
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extern const unsigned long sysn32_call_table[];
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static inline int __syscall_get_arch(void)
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{
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int arch = EM_MIPS;
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#ifdef CONFIG_64BIT
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arch |= __AUDIT_ARCH_64BIT;
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#endif
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#if defined(__LITTLE_ENDIAN)
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arch |= __AUDIT_ARCH_LE;
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#endif
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return arch;
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}
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#endif /* __ASM_MIPS_SYSCALL_H */
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