syscall.h revision 6e34574603f633fa67cf1037aa6374292469c74f
119e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle/* 2c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle * Access to user system call parameters and results 3c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle * 419e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle * This file is subject to the terms and conditions of the GNU General Public 519e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle * License. See the file "COPYING" in the main directory of this archive 619e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle * for more details. 719e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle * 8c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle * See asm-generic/syscall.h for descriptions of what we must do here. 9c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle * 1019e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle * Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org> 1119e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle */ 1219e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle 1319e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle#ifndef __ASM_MIPS_SYSCALL_H 1419e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle#define __ASM_MIPS_SYSCALL_H 1519e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle 16bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#include <linux/audit.h> 17bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#include <linux/elf-em.h> 18c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#include <linux/kernel.h> 19c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#include <linux/sched.h> 20c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#include <linux/uaccess.h> 21c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#include <asm/ptrace.h> 22c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 23c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechlestatic inline long syscall_get_nr(struct task_struct *task, 24c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle struct pt_regs *regs) 25c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle{ 26c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return regs->regs[2]; 27c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle} 28c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 29c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechlestatic inline unsigned long mips_get_syscall_arg(unsigned long *arg, 30c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle struct task_struct *task, struct pt_regs *regs, unsigned int n) 31c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle{ 3263238f2cc5518e1c45a3418fc0ac0f560dafe7efGuenter Roeck unsigned long usp __maybe_unused = regs->regs[29]; 33c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 34c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle switch (n) { 35c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle case 0: case 1: case 2: case 3: 36c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle *arg = regs->regs[4 + n]; 37c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 38c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return 0; 39c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 40c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#ifdef CONFIG_32BIT 41c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle case 4: case 5: case 6: case 7: 42c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return get_user(*arg, (int *)usp + 4 * n); 43c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 44c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 45c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#ifdef CONFIG_64BIT 46c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle case 4: case 5: case 6: case 7: 47c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#ifdef CONFIG_MIPS32_O32 48c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle if (test_thread_flag(TIF_32BIT_REGS)) 49c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return get_user(*arg, (int *)usp + 4 * n); 50c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle else 51c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 52c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle *arg = regs->regs[4 + n]; 53c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 54c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return 0; 55c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 56c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 57c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle default: 58c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle BUG(); 59c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle } 60c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle} 61c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 621d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechlestatic inline long syscall_get_return_value(struct task_struct *task, 631d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle struct pt_regs *regs) 641d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle{ 651d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle return regs->regs[2]; 661d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle} 671d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle 6822feadbe4c455491be5725bc7a6073b98db5db99Markos Chandrasstatic inline void syscall_rollback(struct task_struct *task, 6922feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras struct pt_regs *regs) 7022feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras{ 7122feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras /* Do nothing */ 7222feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras} 7322feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras 741d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechlestatic inline void syscall_set_return_value(struct task_struct *task, 751d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle struct pt_regs *regs, 761d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle int error, long val) 771d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle{ 781d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle if (error) { 791d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[2] = -error; 801d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[7] = -1; 811d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle } else { 821d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[2] = val; 831d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[7] = 0; 841d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle } 851d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle} 861d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle 87c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechlestatic inline void syscall_get_arguments(struct task_struct *task, 88c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle struct pt_regs *regs, 89c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle unsigned int i, unsigned int n, 90c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle unsigned long *args) 91c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle{ 92c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle unsigned long arg; 93c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle int ret; 94c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 95c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle while (n--) 96c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle ret |= mips_get_syscall_arg(&arg, task, regs, i++); 97c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 98c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle /* 99c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle * No way to communicate an error because this is a void function. 100c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle */ 101c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#if 0 102c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return ret; 103c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 104c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle} 105c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 10619e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechleextern const unsigned long sys_call_table[]; 10719e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechleextern const unsigned long sys32_call_table[]; 10819e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechleextern const unsigned long sysn32_call_table[]; 10919e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle 1106e34574603f633fa67cf1037aa6374292469c74fMarkos Chandrasstatic inline int syscall_get_arch(struct task_struct *task, 1116e34574603f633fa67cf1037aa6374292469c74fMarkos Chandras struct pt_regs *regs) 112bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle{ 113bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle int arch = EM_MIPS; 114bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#ifdef CONFIG_64BIT 1156e34574603f633fa67cf1037aa6374292469c74fMarkos Chandras if (!test_tsk_thread_flag(task, TIF_32BIT_REGS)) 1166e34574603f633fa67cf1037aa6374292469c74fMarkos Chandras arch |= __AUDIT_ARCH_64BIT; 117bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#endif 118bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#if defined(__LITTLE_ENDIAN) 119bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle arch |= __AUDIT_ARCH_LE; 120bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#endif 121bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle return arch; 122bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle} 123bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle 12419e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle#endif /* __ASM_MIPS_SYSCALL_H */ 125