1/* 2 * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com) 3 * Licensed under the GPL 4 */ 5 6#ifndef __SYSDEP_STUB_H 7#define __SYSDEP_STUB_H 8 9#include <sys/mman.h> 10#include <asm/ptrace.h> 11#include <asm/unistd.h> 12#include "as-layout.h" 13#include "stub-data.h" 14#include "kern_constants.h" 15 16extern void stub_segv_handler(int sig); 17extern void stub_clone_handler(void); 18 19#define STUB_SYSCALL_RET EAX 20#define STUB_MMAP_NR __NR_mmap2 21#define MMAP_OFFSET(o) ((o) >> UM_KERN_PAGE_SHIFT) 22 23static inline long stub_syscall0(long syscall) 24{ 25 long ret; 26 27 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall)); 28 29 return ret; 30} 31 32static inline long stub_syscall1(long syscall, long arg1) 33{ 34 long ret; 35 36 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1)); 37 38 return ret; 39} 40 41static inline long stub_syscall2(long syscall, long arg1, long arg2) 42{ 43 long ret; 44 45 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 46 "c" (arg2)); 47 48 return ret; 49} 50 51static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3) 52{ 53 long ret; 54 55 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 56 "c" (arg2), "d" (arg3)); 57 58 return ret; 59} 60 61static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3, 62 long arg4) 63{ 64 long ret; 65 66 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 67 "c" (arg2), "d" (arg3), "S" (arg4)); 68 69 return ret; 70} 71 72static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3, 73 long arg4, long arg5) 74{ 75 long ret; 76 77 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 78 "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)); 79 80 return ret; 81} 82 83static inline void trap_myself(void) 84{ 85 __asm("int3"); 86} 87 88static inline void remap_stack(int fd, unsigned long offset) 89{ 90 __asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;" 91 "movl %7, %%ebx ; movl %%eax, (%%ebx)" 92 : : "g" (STUB_MMAP_NR), "b" (STUB_DATA), 93 "c" (UM_KERN_PAGE_SIZE), 94 "d" (PROT_READ | PROT_WRITE), 95 "S" (MAP_FIXED | MAP_SHARED), "D" (fd), 96 "a" (offset), 97 "i" (&((struct stub_data *) STUB_DATA)->err) 98 : "memory"); 99} 100 101#endif 102