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 <asm/ptrace.h> 10 11 #define STUB_SYSCALL_RET EAX 12 #define STUB_MMAP_NR __NR_mmap2 13 #define MMAP_OFFSET(o) ((o) >> UM_KERN_PAGE_SHIFT) 14 15 static inline long stub_syscall0(long syscall) 16 { 17 long ret; 18 19 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall)); 20 21 return ret; 22 } 23 24 static inline long stub_syscall1(long syscall, long arg1) 25 { 26 long ret; 27 28 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1)); 29 30 return ret; 31 } 32 33 static inline long stub_syscall2(long syscall, long arg1, long arg2) 34 { 35 long ret; 36 37 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 38 "c" (arg2)); 39 40 return ret; 41 } 42 43 static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3) 44 { 45 long ret; 46 47 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 48 "c" (arg2), "d" (arg3)); 49 50 return ret; 51 } 52 53 static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3, 54 long arg4) 55 { 56 long ret; 57 58 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 59 "c" (arg2), "d" (arg3), "S" (arg4)); 60 61 return ret; 62 } 63 64 static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3, 65 long arg4, long arg5) 66 { 67 long ret; 68 69 __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), 70 "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)); 71 72 return ret; 73 } 74 75 static inline void trap_myself(void) 76 { 77 __asm("int3"); 78 } 79 80 static inline void remap_stack(int fd, unsigned long offset) 81 { 82 __asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;" 83 "movl %7, %%ebx ; movl %%eax, (%%ebx)" 84 : : "g" (STUB_MMAP_NR), "b" (STUB_DATA), 85 "c" (UM_KERN_PAGE_SIZE), 86 "d" (PROT_READ | PROT_WRITE), 87 "S" (MAP_FIXED | MAP_SHARED), "D" (fd), 88 "a" (offset), 89 "i" (&((struct stub_data *) STUB_DATA)->err) 90 : "memory"); 91 } 92 93 #endif 94