cmd/objdump: add arm disassembler

[cookieo9]

On darwin, running the list command in pprof produces an error from the go-supplied
objdump. Weblist is similarly affected.

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.
1. Create code to be profiled (eg: http://play.golang.org/p/wW7KHrZQyB)
2. Profile it (go test -bench . -memprofile mem.prof)
3. Load the profile in pprof (go tool pprof --alloc_space alloc.test mem.profile)
4. Try to get a listing of a function (list alloc.BenchmarkAlloc)

What is the expected output?
A code listing w/ profile data for each line.

What do you see instead?
objdump: syminit: Undefined error: 0
no filename found in _/Users/cookieo9/alloc.BenchmarkAlloc<3c040>

Which operating system are you using?
Mac OS X 10.9.2 (darwin/amd64)

Which version are you using?  (run 'go version' or 'gccgo --version')
go version devel +7257b771f12b Mon Mar 03 11:25:57 2014 -0800 darwin/amd64 (tip)

Go 1.2.1 (homebrew) works, tip does not. I believe it has something to do with one of
the changes to address https://golang.org/issue/6853 and objdump
hasn't been brought up-to date.

[rsc]

Comment 1:

This is a known problem; I need to rewrite objdump in Go to make it work again

Labels changed: added release-go1.3.

Status changed to Started.

[gopherbot]

Comment 3:

CL https://golang.org/cl/87580043 mentions this issue.

[rsc]

Comment 4:

This issue was updated by revision 0d441a0.

This is the basic logic needed for objdump, and it works well enough
to support the pprof list and weblist commands. A real disassembler
needs to be added in order to support the pprof disasm command
and the per-line assembly displays in weblist. That's still to come.
Probably objdump will move to go.tools when the disassembler
is added, but it can stay here for now.
LGTM=minux.ma
R=golang-codereviews, minux.ma
CC=golang-codereviews, iant, r
https://golang.org/cl/87580043

[gopherbot]

Comment 5:

CL https://golang.org/cl/91360046 mentions this issue.

[rsc]

Comment 6:

This issue was updated by revision 79fb16d.

x86 disassembly works and is tested.
The arm disassembler does not exist yet
and is therefore not yet hooked up.
LGTM=crawshaw, iant
R=crawshaw, iant
CC=golang-codereviews
https://golang.org/cl/91360046

[davecheney]

Comment 7:

Would you like to see ARM disassembly added for 1.3, or is it too late ?

[rsc]

Comment 8:

Replying to #7, it's on its way.

[davecheney]

Comment 9:

@rsc, aram and I are happy to help fill in the gaps if you have the beginnings of a CL.

[rsc]

Comment 10:

Owner changed to @rsc.

[gopherbot]

Comment 11:

CL https://golang.org/cl/104770046 mentions this issue.

[rsc]

Comment 12:

This issue was closed by revision 9f2dfb8.

Status changed to Fixed.