| /* |
| * Access to user system call parameters and results |
| * |
| * Copyright (C) 2008 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License v.2. |
| * |
| * See asm-generic/syscall.h for descriptions of what we must do here. |
| */ |
| |
| #ifndef _ASM_SYSCALL_H |
| #define _ASM_SYSCALL_H 1 |
| |
| #include <uapi/linux/audit.h> |
| #include <linux/sched.h> |
| #include <linux/thread_info.h> |
| |
| /* ftrace syscalls requires exporting the sys_call_table */ |
| #ifdef CONFIG_FTRACE_SYSCALLS |
| extern const unsigned long *sys_call_table; |
| #endif /* CONFIG_FTRACE_SYSCALLS */ |
| |
| static inline long syscall_get_nr(struct task_struct *task, |
| struct pt_regs *regs) |
| { |
| return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1L; |
| } |
| |
| static inline void syscall_rollback(struct task_struct *task, |
| struct pt_regs *regs) |
| { |
| regs->gpr[3] = regs->orig_gpr3; |
| } |
| |
| static inline long syscall_get_error(struct task_struct *task, |
| struct pt_regs *regs) |
| { |
| return (regs->ccr & 0x10000000) ? -regs->gpr[3] : 0; |
| } |
| |
| static inline long syscall_get_return_value(struct task_struct *task, |
| struct pt_regs *regs) |
| { |
| return regs->gpr[3]; |
| } |
| |
| static inline void syscall_set_return_value(struct task_struct *task, |
| struct pt_regs *regs, |
| int error, long val) |
| { |
| if (error) { |
| regs->ccr |= 0x10000000L; |
| regs->gpr[3] = -error; |
| } else { |
| regs->ccr &= ~0x10000000L; |
| regs->gpr[3] = val; |
| } |
| } |
| |
| static inline void syscall_get_arguments(struct task_struct *task, |
| struct pt_regs *regs, |
| unsigned int i, unsigned int n, |
| unsigned long *args) |
| { |
| BUG_ON(i + n > 6); |
| #ifdef CONFIG_PPC64 |
| if (test_tsk_thread_flag(task, TIF_32BIT)) { |
| /* |
| * Zero-extend 32-bit argument values. The high bits are |
| * garbage ignored by the actual syscall dispatch. |
| */ |
| while (n-- > 0) |
| args[n] = (u32) regs->gpr[3 + i + n]; |
| return; |
| } |
| #endif |
| memcpy(args, ®s->gpr[3 + i], n * sizeof(args[0])); |
| } |
| |
| static inline void syscall_set_arguments(struct task_struct *task, |
| struct pt_regs *regs, |
| unsigned int i, unsigned int n, |
| const unsigned long *args) |
| { |
| BUG_ON(i + n > 6); |
| memcpy(®s->gpr[3 + i], args, n * sizeof(args[0])); |
| } |
| |
| static inline int syscall_get_arch(void) |
| { |
| return is_32bit_task() ? AUDIT_ARCH_PPC : AUDIT_ARCH_PPC64; |
| } |
| #endif /* _ASM_SYSCALL_H */ |