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 <asm/page.h> 13#include "stub-data.h" 14#include "kern_constants.h" 15#include "uml-config.h" 16 17extern void stub_segv_handler(int sig); 18extern void stub_clone_handler(void); 19 20#define STUB_SYSCALL_RET EAX 21#define STUB_MMAP_NR __NR_mmap2 22#define MMAP_OFFSET(o) ((o) >> PAGE_SHIFT) 23 24static inline long stub_syscall0(long syscall) 25{ 26 long ret; 27 28 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall)); 29 30 return ret; 31} 32 33static inline long stub_syscall1(long syscall, long arg1) 34{ 35 long ret; 36 37 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1)); 38 39 return ret; 40} 41 42static inline long stub_syscall2(long syscall, long arg1, long arg2) 43{ 44 long ret; 45 46 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 47 "c" (arg2)); 48 49 return ret; 50} 51 52static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3) 53{ 54 long ret; 55 56 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 57 "c" (arg2), "d" (arg3)); 58 59 return ret; 60} 61 62static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3, 63 long arg4) 64{ 65 long ret; 66 67 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 68 "c" (arg2), "d" (arg3), "S" (arg4)); 69 70 return ret; 71} 72 73static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3, 74 long arg4, long arg5) 75{ 76 long ret; 77 78 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 79 "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)); 80 81 return ret; 82} 83 84static inline void trap_myself(void) 85{ 86 __asm("int3"); 87} 88 89static inline void remap_stack(int fd, unsigned long offset) 90{ 91 __asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;" 92 "movl %7, %%ebx ; movl %%eax, (%%ebx)" 93 : : "g" (STUB_MMAP_NR), "b" (UML_CONFIG_STUB_DATA), 94 "c" (UM_KERN_PAGE_SIZE), 95 "d" (PROT_READ | PROT_WRITE), 96 "S" (MAP_FIXED | MAP_SHARED), "D" (fd), 97 "a" (offset), 98 "i" (&((struct stub_data *) UML_CONFIG_STUB_DATA)->err) 99 : "memory"); 100} 101 102#endif 103