| /* |
| * Access to user system call parameters and results |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * See asm-generic/syscall.h for descriptions of what we must do here. |
| * |
| * Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org> |
| */ |
| |
| #ifndef __ASM_MIPS_SYSCALL_H |
| #define __ASM_MIPS_SYSCALL_H |
| |
| #include <linux/compiler.h> |
| #include <uapi/linux/audit.h> |
| #include <linux/elf-em.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/uaccess.h> |
| #include <asm/ptrace.h> |
| #include <asm/unistd.h> |
| |
| #ifndef __NR_syscall /* Only defined if _MIPS_SIM == _MIPS_SIM_ABI32 */ |
| #define __NR_syscall 4000 |
| #endif |
| |
| static inline long syscall_get_nr(struct task_struct *task, |
| struct pt_regs *regs) |
| { |
| /* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */ |
| if ((config_enabled(CONFIG_32BIT) || |
| test_tsk_thread_flag(task, TIF_32BIT_REGS)) && |
| (regs->regs[2] == __NR_syscall)) |
| return regs->regs[4]; |
| else |
| return regs->regs[2]; |
| } |
| |
| static inline unsigned long mips_get_syscall_arg(unsigned long *arg, |
| struct task_struct *task, struct pt_regs *regs, unsigned int n) |
| { |
| unsigned long usp __maybe_unused = regs->regs[29]; |
| |
| switch (n) { |
| case 0: case 1: case 2: case 3: |
| *arg = regs->regs[4 + n]; |
| |
| return 0; |
| |
| #ifdef CONFIG_32BIT |
| case 4: case 5: case 6: case 7: |
| return get_user(*arg, (int *)usp + n); |
| #endif |
| |
| #ifdef CONFIG_64BIT |
| case 4: case 5: case 6: case 7: |
| #ifdef CONFIG_MIPS32_O32 |
| if (test_thread_flag(TIF_32BIT_REGS)) |
| return get_user(*arg, (int *)usp + n); |
| else |
| #endif |
| *arg = regs->regs[4 + n]; |
| |
| return 0; |
| #endif |
| |
| default: |
| BUG(); |
| } |
| |
| unreachable(); |
| } |
| |
| static inline long syscall_get_return_value(struct task_struct *task, |
| struct pt_regs *regs) |
| { |
| return regs->regs[2]; |
| } |
| |
| static inline void syscall_rollback(struct task_struct *task, |
| struct pt_regs *regs) |
| { |
| /* Do nothing */ |
| } |
| |
| static inline void syscall_set_return_value(struct task_struct *task, |
| struct pt_regs *regs, |
| int error, long val) |
| { |
| if (error) { |
| regs->regs[2] = -error; |
| regs->regs[7] = -1; |
| } else { |
| regs->regs[2] = val; |
| regs->regs[7] = 0; |
| } |
| } |
| |
| static inline void syscall_get_arguments(struct task_struct *task, |
| struct pt_regs *regs, |
| unsigned int i, unsigned int n, |
| unsigned long *args) |
| { |
| int ret; |
| /* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */ |
| if ((config_enabled(CONFIG_32BIT) || |
| test_tsk_thread_flag(task, TIF_32BIT_REGS)) && |
| (regs->regs[2] == __NR_syscall)) { |
| i++; |
| n++; |
| } |
| |
| while (n--) |
| ret |= mips_get_syscall_arg(args++, task, regs, i++); |
| |
| /* |
| * No way to communicate an error because this is a void function. |
| */ |
| #if 0 |
| return ret; |
| #endif |
| } |
| |
| extern const unsigned long sys_call_table[]; |
| extern const unsigned long sys32_call_table[]; |
| extern const unsigned long sysn32_call_table[]; |
| |
| static inline int syscall_get_arch(void) |
| { |
| int arch = AUDIT_ARCH_MIPS; |
| #ifdef CONFIG_64BIT |
| if (!test_thread_flag(TIF_32BIT_REGS)) |
| arch |= __AUDIT_ARCH_64BIT; |
| if (test_thread_flag(TIF_32BIT_ADDR)) |
| arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32; |
| #endif |
| #if defined(__LITTLE_ENDIAN) |
| arch |= __AUDIT_ARCH_LE; |
| #endif |
| return arch; |
| } |
| |
| #endif /* __ASM_MIPS_SYSCALL_H */ |