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Add an elf-dumper utility.
- Output format and some of the code stolen from macho-dump. - Somewhat incomplete and probably buggy. - Comes with a very basic test. llvm-svn: 113488
This commit is contained in:
Benjamin Kramer
parent
aa9b257b29
commit
8849104392
110
test/MC/ELF/basic-elf.ll
Normal file
110
test/MC/ELF/basic-elf.ll
Normal file
@ -0,0 +1,110 @@
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; RUN: llc -filetype=obj -mtriple i686-pc-linux-gnu %s -o - | elf-dump | FileCheck -check-prefix=32 %s
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; RUN: llc -filetype=obj -mtriple x86_64-pc-linux-gnu %s -o - | elf-dump | FileCheck -check-prefix=64 %s
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@.str1 = private constant [6 x i8] c"Hello\00"
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@.str2 = private constant [7 x i8] c"World!\00"
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define i32 @main() nounwind {
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%1 = call i32 @puts(i8* getelementptr inbounds ([6 x i8]* @.str1, i32 0, i32 0))
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%2 = call i32 @puts(i8* getelementptr inbounds ([7 x i8]* @.str2, i32 0, i32 0))
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ret i32 0
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}
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declare i32 @puts(i8* nocapture) nounwind
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; 32: ('e_indent[EI_CLASS]', 1)
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; 32: ('e_indent[EI_DATA]', 1)
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; 32: ('e_indent[EI_VERSION]', 1)
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; 32: ('_sections', [
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; 32: # Section 0
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; 32: (('sh_name', 0) # ''
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; 32: # '.text'
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; 32: # '.rel.text'
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; 32: ('_relocations', [
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; 32: # Relocation 0
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; 32: (('r_offset', 6)
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; 32: ('r_type', 1)
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; 32: ),
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; 32: # Relocation 1
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; 32: (('r_offset', 11)
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; 32: ('r_type', 2)
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; 32: ),
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; 32: # Relocation 2
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; 32: (('r_offset', 18)
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; 32: ('r_type', 1)
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; 32: ),
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; 32: # Relocation 3
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; 32: (('r_offset', 23)
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; 32: ('r_type', 2)
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; 32: ),
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; 32: ])
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; 32: ('st_bind', 0)
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; 32: ('st_type', 3)
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; 32: ('st_bind', 0)
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; 32: ('st_type', 3)
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; 32: ('st_bind', 0)
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; 32: ('st_type', 3)
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; 32: # 'main'
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; 32: ('st_bind', 1)
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; 32-NEXT: ('st_type', 2)
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; 32: # 'puts'
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; 32: ('st_bind', 1)
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; 32-NEXT: ('st_type', 0)
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; 64: ('e_indent[EI_CLASS]', 2)
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; 64: ('e_indent[EI_DATA]', 1)
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; 64: ('e_indent[EI_VERSION]', 1)
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; 64: ('_sections', [
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; 64: # Section 0
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; 64: (('sh_name', 0) # ''
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; 64: # '.text'
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; 64: # '.rela.text'
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; 64: ('_relocations', [
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; 64: # Relocation 0
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; 64: (('r_offset', 5)
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; 64: ('r_type', 11)
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; 64: ('r_addend', 0)
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; 64: ),
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; 64: # Relocation 1
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; 64: (('r_offset', 10)
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; 64: ('r_type', 2)
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; 64: ('r_addend', -4)
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; 64: ),
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; 64: # Relocation 2
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; 64: (('r_offset', 15)
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; 64: ('r_type', 11)
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; 64: ('r_addend', 6)
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; 64: ),
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; 64: # Relocation 3
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; 64: (('r_offset', 20)
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; 64: ('r_type', 2)
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; 64: ('r_addend', -4)
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; 64: ),
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; 64: ])
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; 64: ('st_bind', 0)
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; 64: ('st_type', 3)
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; 64: ('st_bind', 0)
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; 64: ('st_type', 3)
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; 64: ('st_bind', 0)
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; 64: ('st_type', 3)
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; 64: # 'main'
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; 64-NEXT: ('st_bind', 1)
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; 64-NEXT: ('st_type', 2)
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; 64: # 'puts'
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; 64-NEXT: ('st_bind', 1)
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; 64-NEXT: ('st_type', 0)
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225
test/Scripts/elf-dump
Executable file
225
test/Scripts/elf-dump
Executable file
@ -0,0 +1,225 @@
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#!/usr/bin/env python
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import struct
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import sys
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import StringIO
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class Reader:
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def __init__(self, path):
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if path == "-":
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# Snarf all the data so we can seek.
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self.file = StringIO.StringIO(sys.stdin.read())
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else:
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self.file = open(path, "rb")
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self.isLSB = None
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self.is64Bit = None
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def seek(self, pos):
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self.file.seek(pos)
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def read(self, N):
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data = self.file.read(N)
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if len(data) != N:
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raise ValueError, "Out of data!"
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return data
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def read8(self):
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return ord(self.read(1))
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def read16(self):
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return struct.unpack('><'[self.isLSB] + 'H', self.read(2))[0]
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def read32(self):
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return struct.unpack('><'[self.isLSB] + 'I', self.read(4))[0]
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def read32S(self):
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return struct.unpack('><'[self.isLSB] + 'i', self.read(4))[0]
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def read64(self):
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return struct.unpack('><'[self.isLSB] + 'Q', self.read(8))[0]
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def read64S(self):
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return struct.unpack('><'[self.isLSB] + 'q', self.read(8))[0]
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def readWord(self):
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if self.is64Bit:
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return self.read64()
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else:
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return self.read32()
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def readWordS(self):
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if self.is64Bit:
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return self.read64S()
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else:
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return self.read32S()
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class StringTable:
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def __init__(self, strings):
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self.string_table = strings
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def __getitem__(self, index):
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end = self.string_table.index('\x00', index)
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return self.string_table[index:end]
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class Section:
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def __init__(self, f):
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self.sh_name = f.read32()
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self.sh_type = f.read32()
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self.sh_flags = f.readWord()
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self.sh_addr = f.readWord()
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self.sh_offset = f.readWord()
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self.sh_size = f.readWord()
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self.sh_link = f.read32()
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self.sh_info = f.read32()
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self.sh_addralign = f.readWord()
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self.sh_entsize = f.readWord()
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def dump(self, shstrtab, f, strtab, dumpdata):
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print " (('sh_name', %d) # %r" % (self.sh_name, shstrtab[self.sh_name])
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print " ('sh_type', %d)" % self.sh_type
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print " ('sh_flags', %d)" % self.sh_flags
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print " ('sh_addr', %d)" % self.sh_addr
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print " ('sh_offset', %d)" % self.sh_offset
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print " ('sh_size', %d)" % self.sh_size
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print " ('sh_link', %d)" % self.sh_link
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print " ('sh_info', %d)" % self.sh_info
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print " ('sh_addralign', %d)" % self.sh_addralign
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print " ('sh_entsize', %d)" % self.sh_entsize
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if self.sh_type == 2: # SHT_SYMTAB
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print " ('_symbols', ["
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dumpSymtab(f, self, strtab)
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print " ])"
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elif self.sh_type == 4 or self.sh_type == 9: # SHT_RELA / SHT_REL
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print " ('_relocations', ["
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dumpRel(f, self, self.sh_type == 4)
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print " ])"
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elif dumpdata:
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f.seek(self.sh_offset)
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print " ('_section_data', %r)" % f.read(self.sh_size)
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print " ),"
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def dumpSymtab(f, section, strtab):
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entries = section.sh_size // section.sh_entsize
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for index in range(entries):
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f.seek(section.sh_offset + index * section.sh_entsize)
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print " # Symbol %d" % index
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name = f.read32()
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print " (('st_name', %d) # %r" % (name, strtab[name])
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if not f.is64Bit:
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print " ('st_value', %d)" % f.read32()
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print " ('st_size', %d)" % f.read32()
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st_info = f.read8()
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print " ('st_bind', %d)" % (st_info >> 4)
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print " ('st_type', %d)" % (st_info & 0xf)
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print " ('st_other', %d)" % f.read8()
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print " ('st_shndx', %d)" % f.read16()
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if f.is64Bit:
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print " ('st_value', %d)" % f.read64()
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print " ('st_size', %d)" % f.read64()
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print " ),"
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def dumpRel(f, section, dumprela = False):
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entries = section.sh_size // section.sh_entsize
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for index in range(entries):
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f.seek(section.sh_offset + index * section.sh_entsize)
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print " # Relocation %d" % index
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print " (('r_offset', %d)" % f.readWord()
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r_info = f.readWord()
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if f.is64Bit:
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print " ('r_sym', %d)" % (r_info >> 32)
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print " ('r_type', %d)" % (r_info & 0xffffffff)
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else:
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print " ('r_sym', %d)" % (r_info >> 8)
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print " ('r_type', %d)" % (r_info & 0xff)
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if dumprela:
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print " ('r_addend', %d)" % f.readWordS()
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print " ),"
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def dumpELF(path, opts):
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f = Reader(path)
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magic = f.read(4)
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assert magic == '\x7FELF'
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fileclass = f.read8()
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if fileclass == 1: # ELFCLASS32
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f.is64Bit = False
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elif fileclass == 2: # ELFCLASS64
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f.is64Bit = True
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else:
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raise ValueError, "Unknown file class %d" % fileclass
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print "('e_indent[EI_CLASS]', %d)" % fileclass
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byteordering = f.read8()
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if byteordering == 1: # ELFDATA2LSB
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f.isLSB = True
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elif byteordering == 2: # ELFDATA2MSB
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f.isLSB = False
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else:
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raise ValueError, "Unknown byte ordering %d" % byteordering
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print "('e_indent[EI_DATA]', %d)" % byteordering
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print "('e_indent[EI_VERSION]', %d)" % f.read8()
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print "('e_indent[EI_OSABI]', %d)" % f.read8()
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print "('e_indent[EI_ABIVERSION]', %d)" % f.read8()
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f.seek(16) # Seek to end of e_ident.
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print "('e_type', %d)" % f.read16()
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print "('e_machine', %d)" % f.read16()
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print "('e_version', %d)" % f.read32()
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print "('e_entry', %d)" % f.readWord()
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print "('e_phoff', %d)" % f.readWord()
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e_shoff = f.readWord()
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print "('e_shoff', %d)" % e_shoff
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print "('e_flags', %d)" % f.read32()
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print "('e_ehsize', %d)" % f.read16()
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print "('e_phentsize', %d)" % f.read16()
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print "('e_phnum', %d)" % f.read16()
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e_shentsize = f.read16()
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print "('e_shentsize', %d)" % e_shentsize
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e_shnum = f.read16()
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print "('e_shnum', %d)" % e_shnum
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e_shstrndx = f.read16()
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print "('e_shstrndx', %d)" % e_shstrndx
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# Read all section headers
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sections = []
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for index in range(e_shnum):
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f.seek(e_shoff + index * e_shentsize)
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s = Section(f)
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sections.append(s)
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# Read .shstrtab so we can resolve section names
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f.seek(sections[e_shstrndx].sh_offset)
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shstrtab = StringTable(f.read(sections[e_shstrndx].sh_size))
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# Get the symbol string table
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strtab = None
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for section in sections:
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if shstrtab[section.sh_name] == ".strtab":
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f.seek(section.sh_offset)
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strtab = StringTable(f.read(section.sh_size))
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break
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print "('_sections', ["
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for index in range(e_shnum):
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print " # Section %d" % index
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sections[index].dump(shstrtab, f, strtab, opts.dumpSectionData)
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print "])"
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if __name__ == "__main__":
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from optparse import OptionParser, OptionGroup
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parser = OptionParser("usage: %prog [options] {files}")
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parser.add_option("", "--dump-section-data", dest="dumpSectionData",
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help="Dump the contents of sections",
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action="store_true", default=False)
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(opts, args) = parser.parse_args()
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if not args:
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args.append('-')
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for arg in args:
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dumpELF(arg, opts)
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7
test/Scripts/elf-dump.bat
Normal file
7
test/Scripts/elf-dump.bat
Normal file
@ -0,0 +1,7 @@
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@echo off
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@rem We need to set -u to treat stdin as binary. Python 3 has support for doing
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@rem this in code, but I haven't found a way to do this in 2.6 yet.
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%PYTHON_EXECUTABLE% -u %LLVM_SRC_ROOT%\test\Scripts\elf-dump %1 %2 %3 %4 %5 %6 %7 %8 %9
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