syscall.h revision a8031d2ce15bdb90baeae02d7a231ccece73da8b
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 16f5179287b016cc61d6ad77b4a15fab9b6932df83Ralf Baechle#include <linux/compiler.h> 17bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#include <linux/audit.h> 18bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#include <linux/elf-em.h> 19c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#include <linux/kernel.h> 20c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#include <linux/sched.h> 21c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#include <linux/uaccess.h> 22c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#include <asm/ptrace.h> 23c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 24c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechlestatic inline long syscall_get_nr(struct task_struct *task, 25c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle struct pt_regs *regs) 26c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle{ 27c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return regs->regs[2]; 28c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle} 29c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 30c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechlestatic inline unsigned long mips_get_syscall_arg(unsigned long *arg, 31c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle struct task_struct *task, struct pt_regs *regs, unsigned int n) 32c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle{ 3363238f2cc5518e1c45a3418fc0ac0f560dafe7efGuenter Roeck unsigned long usp __maybe_unused = regs->regs[29]; 34c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 35c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle switch (n) { 36c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle case 0: case 1: case 2: case 3: 37c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle *arg = regs->regs[4 + n]; 38c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 39c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return 0; 40c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 41c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#ifdef CONFIG_32BIT 42c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle case 4: case 5: case 6: case 7: 43c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return get_user(*arg, (int *)usp + 4 * n); 44c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 45c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 46c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#ifdef CONFIG_64BIT 47c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle case 4: case 5: case 6: case 7: 48c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#ifdef CONFIG_MIPS32_O32 49c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle if (test_thread_flag(TIF_32BIT_REGS)) 50c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return get_user(*arg, (int *)usp + 4 * n); 51c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle else 52c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 53c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle *arg = regs->regs[4 + n]; 54c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 55c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return 0; 56c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 57c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 58c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle default: 59c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle BUG(); 60c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle } 61f5179287b016cc61d6ad77b4a15fab9b6932df83Ralf Baechle 62f5179287b016cc61d6ad77b4a15fab9b6932df83Ralf Baechle unreachable(); 63c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle} 64c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 651d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechlestatic inline long syscall_get_return_value(struct task_struct *task, 661d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle struct pt_regs *regs) 671d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle{ 681d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle return regs->regs[2]; 691d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle} 701d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle 711d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechlestatic inline void syscall_set_return_value(struct task_struct *task, 721d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle struct pt_regs *regs, 731d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle int error, long val) 741d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle{ 751d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle if (error) { 761d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[2] = -error; 771d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[7] = -1; 781d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle } else { 791d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[2] = val; 801d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[7] = 0; 811d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle } 821d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle} 831d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle 84c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechlestatic inline void syscall_get_arguments(struct task_struct *task, 85c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle struct pt_regs *regs, 86c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle unsigned int i, unsigned int n, 87c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle unsigned long *args) 88c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle{ 89c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle int ret; 90c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 91c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle while (n--) 92a8031d2ce15bdb90baeae02d7a231ccece73da8bMarkos Chandras ret |= mips_get_syscall_arg(args++, task, regs, i++); 93c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 94c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle /* 95c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle * No way to communicate an error because this is a void function. 96c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle */ 97c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#if 0 98c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return ret; 99c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 100c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle} 101c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 10219e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechleextern const unsigned long sys_call_table[]; 10319e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechleextern const unsigned long sys32_call_table[]; 10419e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechleextern const unsigned long sysn32_call_table[]; 10519e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle 106bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechlestatic inline int __syscall_get_arch(void) 107bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle{ 108bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle int arch = EM_MIPS; 109bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#ifdef CONFIG_64BIT 110bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle arch |= __AUDIT_ARCH_64BIT; 111bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#endif 112bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#if defined(__LITTLE_ENDIAN) 113bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle arch |= __AUDIT_ARCH_LE; 114bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#endif 115bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle return arch; 116bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle} 117bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle 11819e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle#endif /* __ASM_MIPS_SYSCALL_H */ 119