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llvm-objdump: Do not attempt to disassemble symbols outside of section

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boundaries.

It is possible to create an ELF executable where symbol from say .text
section 'points' to the address outside the section boundaries. It does
not have a sense to disassemble something outside the section.

Without this fix llvm-objdump prints finite or infinite (depends on
the executable file architecture) number of 'invalid instruction
encoding' warnings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202083 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Simon Atanasyan 2014-02-24 22:12:11 +00:00
parent e5f1c6d3da
commit 341d0f4b9e
4 changed files with 34 additions and 3 deletions
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BIN
test/tools/llvm-objdump/Inputs/out-of-section-sym.elf-i386 Normal file
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15
test/tools/llvm-objdump/Inputs/out-of-section-sym.s Normal file
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@ -0,0 +1,15 @@
// $ cat out-of-section-sym.ld
// SECTIONS
// {
// . = 0x10;
// .text : { _ftext = . ; *(.text) }
// . = 0x20;
// .data : { _fdata = . ; *(.data) }
// }
// as --32 out-of-section-sym.s -o out-of-section-sym.o
// ld -m elf_i386 -Tout-of-section-sym.ld -o out-of-section-sym.elf-i386 \
// out-of-section-sym.o
.text
_start:
ret

13
test/tools/llvm-objdump/out-of-section-sym.test Normal file
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@ -0,0 +1,13 @@
// Check that llvm-objdump does not attempt to disassemble symbols outside
// of section boundaries.
// RUN: llvm-objdump -d -t %p/Inputs/out-of-section-sym.elf-i386 | FileCheck %s
CHECK: Disassembly of section .text:
CHECK-NEXT: _start:
CHECK-NEXT: 10: c3 retl
CHECK-NEXT: SYMBOL TABLE:
CHECK-NEXT: 00000000 *UND* 00000000
CHECK-NEXT: 00000010 l d .text 00000000 .text
CHECK-NEXT: 00000010 .text 00000000 _start
CHECK-NEXT: 00000020 .text 00000000 _fdata
CHECK-NEXT: 00000010 .text 00000000 _ftext

9
tools/llvm-objdump/llvm-objdump.cpp
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@ -405,6 +405,10 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
if (error(I->getAddress(SectionAddr)))
break;
uint64_t SectSize;
if (error(I->getSize(SectSize)))
break;
// Make a list of all the symbols in this section.
std::vector<std::pair<uint64_t, StringRef> > Symbols;
for (symbol_iterator SI = Obj->symbol_begin(), SE = Obj->symbol_end();
@ -417,6 +421,8 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
if (Address == UnknownAddressOrSize)
continue;
Address -= SectionAddr;
if (Address >= SectSize)
continue;
StringRef Name;
if (error(SI->getName(Name)))
@ -473,9 +479,6 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
StringRefMemoryObject memoryObject(Bytes, SectionAddr);
uint64_t Size;
uint64_t Index;
uint64_t SectSize;
if (error(I->getSize(SectSize)))
break;
std::vector<RelocationRef>::const_iterator rel_cur = Rels.begin();
std::vector<RelocationRef>::const_iterator rel_end = Rels.end();