http://sourceware.org/bugzilla/show_bug.cgi?id=12336
Summary: [Wishlist] objdump option to use symbol relative
addresses
Product: binutils
Version: unspecified
Status: NEW
Severity: enhancement
Priority: P2
Component: binutils
AssignedTo: unassig...@sources.redhat.com
ReportedBy: johns...@us.ibm.com
When using objdump -d, the addresses in the output makes it difficult to use
tools like diff to compare source changes at the asm level.
For instance, if I make a change to some C source, then objdump the compiled .o
file both with and without the change, the resulting diff is filled with
unrelated noise due to the trivial address changes:
-0000000000000900 <lock_hrtimer_base>:
- 900: 55 push %rbp
- 901: 48 89 e5 mov %rsp,%rbp
- 904: 41 56 push %r14
- 906: 41 55 push %r13
- 908: 41 54 push %r12
- 90a: 53 push %rbx
- 90b: e8 00 00 00 00 callq 910 <lock_hrtimer_base+0x10>
- 910: 49 89 fc mov %rdi,%r12
- 913: 49 89 f5 mov %rsi,%r13
- 916: eb 16 jmp 92e <lock_hrtimer_base+0x2e>
...
+0000000000000960 <lock_hrtimer_base>:
+ 960: 55 push %rbp
+ 961: 48 89 e5 mov %rsp,%rbp
+ 964: 41 56 push %r14
+ 966: 41 55 push %r13
+ 968: 41 54 push %r12
+ 96a: 53 push %rbx
+ 96b: e8 00 00 00 00 callq 970 <lock_hrtimer_base+0x10>
+ 970: 49 89 fc mov %rdi,%r12
+ 973: 49 89 f5 mov %rsi,%r13
+ 976: eb 16 jmp 98e <lock_hrtimer_base+0x2e>
It would be much preferable if the objdump output used symbol relative
addresses, and would look something like:
0000000000000960 <lock_hrtimer_base>:
<+00>: 55 push %rbp
<+01>: 48 89 e5 mov %rsp,%rbp
<+04>: 41 56 push %r14
<+06>: 41 55 push %r13
<+08>: 41 54 push %r12
<+0a>: 53 push %rbx
<+0b>: e8 00 00 00 00 callq <lock_hrtimer_base+0x10>
<+10>: 49 89 fc mov %rdi,%r12
<+13>: 49 89 f5 mov %rsi,%r13
<+16>: eb 16 jmp <lock_hrtimer_base+0x2e>
And the resulting diff for this function would be:
-0000000000000900 <lock_hrtimer_base>:
+0000000000000960 <lock_hrtimer_base>:
Which makes it obvious that nothing has changed but the start address of the
function.
Using --prefix-address, along with '| cut -d"<" -f2' gets me close to what I
need, but I still get a lot of noise in the call addresses:
-lock_hrtimer_base+0xb> callq 00000000000009f0
+lock_hrtimer_base+0xb> callq 0000000000000ab0
lock_hrtimer_base+0x10> mov %rdi,%r12
lock_hrtimer_base+0x13> mov %rsi,%r13
-lock_hrtimer_base+0x16> jmp 0000000000000a0e
+lock_hrtimer_base+0x16> jmp 0000000000000ace
lock_hrtimer_base+0x18> nopl 0x0(%rax,%rax,1)
Since objdump already provides the <lock_hrtimer_base+0x10> style annotation, I
suspect this wouldn't be very difficult for someone familiar with the code to
implement, and would be very useful!
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