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160 lines
3.6 KiB
160 lines
3.6 KiB
/* |
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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 <[email protected]> |
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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/compiler.h> |
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#include <uapi/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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#include <asm/unistd.h> |
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#ifndef __NR_syscall /* Only defined if _MIPS_SIM == _MIPS_SIM_ABI32 */ |
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#define __NR_syscall 4000 |
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#endif |
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static inline bool mips_syscall_is_indirect(struct task_struct *task, |
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struct pt_regs *regs) |
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{ |
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/* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */ |
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return (IS_ENABLED(CONFIG_32BIT) || |
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test_tsk_thread_flag(task, TIF_32BIT_REGS)) && |
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(regs->regs[2] == __NR_syscall); |
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} |
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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 current_thread_info()->syscall; |
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} |
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static inline void mips_syscall_update_nr(struct task_struct *task, |
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struct pt_regs *regs) |
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{ |
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/* |
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* v0 is the system call number, except for O32 ABI syscall(), where it |
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* ends up in a0. |
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*/ |
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if (mips_syscall_is_indirect(task, regs)) |
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task_thread_info(task)->syscall = regs->regs[4]; |
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else |
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task_thread_info(task)->syscall = regs->regs[2]; |
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} |
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static inline void 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; |
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#ifdef CONFIG_32BIT |
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case 4: case 5: case 6: case 7: |
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get_user(*arg, (int *)usp + n); |
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return; |
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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_tsk_thread_flag(task, TIF_32BIT_REGS)) |
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get_user(*arg, (int *)usp + 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; |
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#endif |
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default: |
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BUG(); |
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} |
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unreachable(); |
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} |
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static inline long syscall_get_error(struct task_struct *task, |
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struct pt_regs *regs) |
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{ |
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return regs->regs[7] ? -regs->regs[2] : 0; |
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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 long *args) |
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{ |
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unsigned int i = 0; |
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unsigned int n = 6; |
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/* O32 ABI syscall() */ |
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if (mips_syscall_is_indirect(task, regs)) |
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i++; |
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while (n--) |
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mips_get_syscall_arg(args++, task, regs, i++); |
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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(struct task_struct *task) |
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{ |
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int arch = AUDIT_ARCH_MIPS; |
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#ifdef CONFIG_64BIT |
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if (!test_tsk_thread_flag(task, TIF_32BIT_REGS)) { |
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arch |= __AUDIT_ARCH_64BIT; |
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/* N32 sets only TIF_32BIT_ADDR */ |
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if (test_tsk_thread_flag(task, TIF_32BIT_ADDR)) |
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arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32; |
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} |
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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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