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/* * 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 bool mips_syscall_is_indirect(struct task_struct *task, struct pt_regs *regs) { /* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */ return (IS_ENABLED(CONFIG_32BIT) || test_tsk_thread_flag(task, TIF_32BIT_REGS)) && (regs->regs[2] == __NR_syscall); } static inline long syscall_get_nr(struct task_struct *task, struct pt_regs *regs) { return task_thread_info(task)->syscall; } static inline void mips_syscall_update_nr(struct task_struct *task, struct pt_regs *regs) { /* * v0 is the system call number, except for O32 ABI syscall(), where it * ends up in a0. */ if (mips_syscall_is_indirect(task, regs)) task_thread_info(task)->syscall = regs->regs[4]; else task_thread_info(task)->syscall = regs->regs[2]; } static inline void 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; #ifdef CONFIG_32BIT case 4: case 5: case 6: case 7: get_user(*arg, (int *)usp + n); return; #endif #ifdef CONFIG_64BIT case 4: case 5: case 6: case 7: #ifdef CONFIG_MIPS32_O32 if (test_tsk_thread_flag(task, TIF_32BIT_REGS)) get_user(*arg, (int *)usp + n); else #endif *arg = regs->regs[4 + n]; return; #endif default: BUG(); } unreachable(); } static inline long syscall_get_error(struct task_struct *task, struct pt_regs *regs) { return regs->regs[7] ? -regs->regs[2] : 0; } 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 long *args) { unsigned int i = 0; unsigned int n = 6; /* O32 ABI syscall() */ if (mips_syscall_is_indirect(task, regs)) i++; while (n--) mips_get_syscall_arg(args++, task, regs, i++); } 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(struct task_struct *task) { int arch = AUDIT_ARCH_MIPS; #ifdef CONFIG_64BIT if (!test_tsk_thread_flag(task, TIF_32BIT_REGS)) { arch |= __AUDIT_ARCH_64BIT; /* N32 sets only TIF_32BIT_ADDR */ if (test_tsk_thread_flag(task, 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 */
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