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> 17579ec9e1ab0bdca2dbc3c942aa1a530a6ec8c349Eric Paris#include <uapi/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> 234c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras#include <asm/unistd.h> 244c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras 254c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras#ifndef __NR_syscall /* Only defined if _MIPS_SIM == _MIPS_SIM_ABI32 */ 264c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras#define __NR_syscall 4000 274c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras#endif 28c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 29c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechlestatic inline long syscall_get_nr(struct task_struct *task, 30c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle struct pt_regs *regs) 31c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle{ 324c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras /* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */ 334c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras if ((config_enabled(CONFIG_32BIT) || 344c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras test_tsk_thread_flag(task, TIF_32BIT_REGS)) && 354c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras (regs->regs[2] == __NR_syscall)) 364c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras return regs->regs[4]; 374c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras else 384c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras return regs->regs[2]; 39c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle} 40c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 41c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechlestatic inline unsigned long mips_get_syscall_arg(unsigned long *arg, 42c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle struct task_struct *task, struct pt_regs *regs, unsigned int n) 43c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle{ 4463238f2cc5518e1c45a3418fc0ac0f560dafe7efGuenter Roeck unsigned long usp __maybe_unused = regs->regs[29]; 45c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 46c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle switch (n) { 47c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle case 0: case 1: case 2: case 3: 48c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle *arg = regs->regs[4 + n]; 49c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 50c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return 0; 51c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 52c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#ifdef CONFIG_32BIT 53c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle case 4: case 5: case 6: case 7: 5486ca57b5a5525dbf89fc2a3285781fae807276b0Lars Persson return get_user(*arg, (int *)usp + n); 55c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 56c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 57c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#ifdef CONFIG_64BIT 58c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle case 4: case 5: case 6: case 7: 59c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#ifdef CONFIG_MIPS32_O32 60c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle if (test_thread_flag(TIF_32BIT_REGS)) 6186ca57b5a5525dbf89fc2a3285781fae807276b0Lars Persson return get_user(*arg, (int *)usp + n); 62c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle else 63c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 64c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle *arg = regs->regs[4 + n]; 65c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 66c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return 0; 67c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 68c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 69c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle default: 70c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle BUG(); 71c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle } 72f5179287b016cc61d6ad77b4a15fab9b6932df83Ralf Baechle 73f5179287b016cc61d6ad77b4a15fab9b6932df83Ralf Baechle unreachable(); 74c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle} 75c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 761d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechlestatic inline long syscall_get_return_value(struct task_struct *task, 771d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle struct pt_regs *regs) 781d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle{ 791d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle return regs->regs[2]; 801d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle} 811d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle 8222feadbe4c455491be5725bc7a6073b98db5db99Markos Chandrasstatic inline void syscall_rollback(struct task_struct *task, 8322feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras struct pt_regs *regs) 8422feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras{ 8522feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras /* Do nothing */ 8622feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras} 8722feadbe4c455491be5725bc7a6073b98db5db99Markos Chandras 881d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechlestatic inline void syscall_set_return_value(struct task_struct *task, 891d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle struct pt_regs *regs, 901d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle int error, long val) 911d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle{ 921d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle if (error) { 931d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[2] = -error; 941d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[7] = -1; 951d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle } else { 961d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[2] = val; 971d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle regs->regs[7] = 0; 981d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle } 991d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle} 1001d7bf993e0731b4ac790667c196b2a2d787f95c3Ralf Baechle 101c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechlestatic inline void syscall_get_arguments(struct task_struct *task, 102c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle struct pt_regs *regs, 103c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle unsigned int i, unsigned int n, 104c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle unsigned long *args) 105c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle{ 106c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle int ret; 1074c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras /* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */ 1084c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras if ((config_enabled(CONFIG_32BIT) || 1094c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras test_tsk_thread_flag(task, TIF_32BIT_REGS)) && 1104c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras (regs->regs[2] == __NR_syscall)) { 1114c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras i++; 1124c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras n++; 1134c21b8fd8f146a22e1eaf92833a32e51f560e82aMarkos Chandras } 114c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 115c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle while (n--) 116a8031d2ce15bdb90baeae02d7a231ccece73da8bMarkos Chandras ret |= mips_get_syscall_arg(args++, task, regs, i++); 117c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 118c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle /* 119c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle * No way to communicate an error because this is a void function. 120c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle */ 121c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#if 0 122c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle return ret; 123c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle#endif 124c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle} 125c0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0Ralf Baechle 12619e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechleextern const unsigned long sys_call_table[]; 12719e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechleextern const unsigned long sys32_call_table[]; 12819e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechleextern const unsigned long sysn32_call_table[]; 12919e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle 1305e937a9ae9137899c6641d718bd3820861099a09Eric Parisstatic inline int syscall_get_arch(void) 131bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle{ 132ce5d112827e5c2e9864323d0efd7ec2a62c6dce0Eric Paris int arch = AUDIT_ARCH_MIPS; 133bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#ifdef CONFIG_64BIT 13440381529f84c4cda3bd2d20cab6a707508856b21Markos Chandras if (!test_thread_flag(TIF_32BIT_REGS)) { 1356e34574603f633fa67cf1037aa6374292469c74fMarkos Chandras arch |= __AUDIT_ARCH_64BIT; 13640381529f84c4cda3bd2d20cab6a707508856b21Markos Chandras /* N32 sets only TIF_32BIT_ADDR */ 13740381529f84c4cda3bd2d20cab6a707508856b21Markos Chandras if (test_thread_flag(TIF_32BIT_ADDR)) 13840381529f84c4cda3bd2d20cab6a707508856b21Markos Chandras arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32; 13940381529f84c4cda3bd2d20cab6a707508856b21Markos Chandras } 140bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#endif 141bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#if defined(__LITTLE_ENDIAN) 142bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle arch |= __AUDIT_ARCH_LE; 143bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle#endif 144bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle return arch; 145bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle} 146bec9b2b2c164455e2cd1103c9059d4f8e5926416Ralf Baechle 14719e2e172f0ed2552793ecef506b00c3fa3421845Ralf Baechle#endif /* __ASM_MIPS_SYSCALL_H */ 148