gobjdump

Utility for dumping ELF executables built with Go

This is a simple tool for dumping out some of the information specific to Go from a ELF binary built with Go, such as pc/func data, function argument/local pointer map, etc. This is currently only tested for ELF binaries built with Go 1.19, it might not work for ELF binaries built with older or newer versions of Go.

to build:

$ go build

to print usage:

$ gobjdump -h

Examples

$ gobjdump mod gobjdump
# moduledata {
#            pcHeader: 0x66cda0
#         funcnametab: 0x66ce00
#               cutab: 0x690380
#             filetab: 0x691020
#               pctab: 0x6952a0
#           pclntable: 0x6db9e0
#                ftab: 0x6db9e0
#         findfunctab: 0x6683c0
#               minpc: 0x401000
#               maxpc: 0x5f3fe6
#                text: 0x401000
#               etext: 0x5f3fe6
#           noptrdata: 0x742500
#          enoptrdata: 0x755740
#                data: 0x755740
# ...
# }

$ gobjdump func gobjdump # print all the functions in gobjdump
$ gobjdump safe -f main.main gobjdump # print the safe points in the function main.main of gobjdump as follows
# main.main(/home/sz/go/gobjdump/main.go):
#     0x5f22a0-->0x5f22ac: safe
#     0x5f22ac-->0x5f22b2: unsafe
#     0x5f22b2-->0x5f22dd: safe
#     0x5f22dd-->0x5f2327: unsafe
#     0x5f2327-->0x5f2339: safe
#     0x5f2339-->0x5f235e: unsafe
#     0x5f235e-->0x5f2374: safe
#     0x5f2374-->0x5f239d: unsafe
#     0x5f239d-->0x5f23b3: safe
# ...

$ gobjdump pcsp -f main.main gobjdump # print the pcsp of the main.main function
# main.main(/home/sz/go/gobjdump/main.go):
#     0x5f22a0-->0x5f22b9: 0x0
#     0x5f22b9-->0x5f3564: 0x238
#     0x5f3564-->0x5f356f: 0x0