1 #!/usr/bin/python 2 # 3 # this tool is used to check that the syscall numbers that are in 4 # SYSCALLS.TXT correspond to those found in the Linux kernel sources 5 # for the arm and i386 architectures 6 # 7 8 import sys, re, string, os, commands 9 from bionic_utils import * 10 11 # change this if necessary 12 syscalls_txt = "SYSCALLS.TXT" 13 14 def usage(): 15 print "usage: checksyscalls [options] [kernel_headers_rootdir]" 16 print " options: -v enable verbose mode" 17 sys.exit(1) 18 19 20 linux_root = None 21 syscalls_file = None 22 23 def parse_command_line(args): 24 global linux_root, syscalls_file, verbose 25 26 program = args[0] 27 args = args[1:] 28 while len(args) > 0 and args[0][0] == "-": 29 option = args[0][1:] 30 args = args[1:] 31 32 if option == "v": 33 D_setlevel(1) 34 else: 35 usage() 36 37 if len(args) > 2: 38 usage() 39 40 if len(args) == 0: 41 linux_root = find_kernel_headers() 42 if linux_root == None: 43 print "Could not locate original or system kernel headers root directory." 44 print "Please specify one when calling this program, i.e. 'checksyscalls <headers-directory>'" 45 sys.exit(1) 46 print "using the following kernel headers root: '%s'" % linux_root 47 else: 48 linux_root = args[0] 49 if not os.path.isdir(linux_root): 50 print "the directory '%s' does not exist. aborting\n" % headers_root 51 sys.exit(1) 52 53 parse_command_line(sys.argv) 54 55 syscalls_file = find_file_from_upwards(None, syscalls_txt) 56 if not syscalls_file: 57 print "could not locate the %s file. Aborting" % syscalls_txt 58 sys.exit(1) 59 60 print "parsing %s" % syscalls_file 61 62 # read the syscalls description file 63 # 64 65 parser = SysCallsTxtParser() 66 parser.parse_file(syscalls_file) 67 syscalls = parser.syscalls 68 69 re_nr_line = re.compile( r"#define __NR_(\w*)\s*\(__NR_SYSCALL_BASE\+\s*(\w*)\)" ) 70 re_nr_clock_line = re.compile( r"#define __NR_(\w*)\s*\(__NR_timer_create\+(\w*)\)" ) 71 re_arm_nr_line = re.compile( r"#define __ARM_NR_(\w*)\s*\(__ARM_NR_BASE\+\s*(\w*)\)" ) 72 re_x86_line = re.compile( r"#define __NR_(\w*)\s*([0-9]*)" ) 73 74 # now read the Linux arm header 75 def process_nr_line(line,dict): 76 77 m = re_nr_line.match(line) 78 if m: 79 dict[m.group(1)] = int(m.group(2)) 80 return 81 82 m = re_nr_clock_line.match(line) 83 if m: 84 dict[m.group(1)] = int(m.group(2)) + 259 85 return 86 87 m = re_arm_nr_line.match(line) 88 if m: 89 offset_str = m.group(2) 90 #print "%s = %s" % (m.group(1), offset_str) 91 base = 10 92 if offset_str.lower().startswith("0x"): 93 # Processing something similar to 94 # #define __ARM_NR_cmpxchg (__ARM_NR_BASE+0x00fff0) 95 base = 16 96 dict["ARM_"+m.group(1)] = int(offset_str, base) + 0x0f0000 97 return 98 99 m = re_x86_line.match(line) 100 if m: 101 # try block because the ARM header has some #define _NR_XXXXX /* nothing */ 102 try: 103 #print "%s = %s" % (m.group(1), m.group(2)) 104 dict[m.group(1)] = int(m.group(2)) 105 except: 106 pass 107 return 108 109 110 def process_header(header_file,dict): 111 fp = open(header_file) 112 D("reading "+header_file) 113 for line in fp.xreadlines(): 114 line = line.strip() 115 if not line: continue 116 process_nr_line(line,dict) 117 fp.close() 118 119 arm_dict = {} 120 x86_dict = {} 121 122 # remove trailing slash from the linux_root, if any 123 if linux_root[-1] == '/': 124 linux_root = linux_root[:-1] 125 126 arm_unistd = find_arch_header(linux_root, "arm", "unistd.h") 127 if not arm_unistd: 128 print "WEIRD: Could not locate the ARM unistd.h kernel header file," 129 print "maybe using a different set of kernel headers might help." 130 sys.exit(1) 131 132 # on recent kernels, asm-i386 and asm-x64_64 have been merged into asm-x86 133 # with two distinct unistd_32.h and unistd_64.h definition files. 134 # take care of this here 135 # 136 x86_unistd = find_arch_header(linux_root, "i386", "unistd.h") 137 if not x86_unistd: 138 x86_unistd = find_arch_header(linux_root, "x86", "unistd_32.h") 139 if not x86_unistd: 140 print "WEIRD: Could not locate the i386/x86 unistd.h header file," 141 print "maybe using a different set of kernel headers might help." 142 sys.exit(1) 143 144 process_header( arm_unistd, arm_dict ) 145 process_header( x86_unistd, x86_dict ) 146 147 # now perform the comparison 148 errors = 0 149 150 def check_syscalls(archname, idname, arch_dict): 151 errors = 0 152 for sc in syscalls: 153 sc_name = sc["name"] 154 sc_id = sc[idname] 155 if sc_id >= 0: 156 if not arch_dict.has_key(sc_name): 157 print "%s syscall %s not defined, should be %d !!" % (archname, sc_name, sc_id) 158 errors += 1 159 elif not arch_dict.has_key(sc_name): 160 print "%s syscall %s is not implemented!" % (archname, sc_name) 161 errors += 1 162 elif arch_dict[sc_name] != sc_id: 163 print "%s syscall %s should be %d instead of %d !!" % (archname, sc_name, arch_dict[sc_name], sc_id) 164 errors += 1 165 return errors 166 167 errors += check_syscalls("arm", "id", arm_dict) 168 errors += check_syscalls("x86", "id2", x86_dict) 169 170 if errors == 0: 171 print "congratulations, everything's fine !!" 172 else: 173 print "correct %d errors !!" % errors 174
