binutils, the GNU binary utilities
The following are the binary utilities, although they are not included on all hosts: ar, nm, objcopy, objdump, ranlib, size, strings, and strip.
For more information on binutils, see Using binutils in GNUPro Utilities.
The most important of these utilities are objcopy and objdump.
- objcopy
- A few ROM monitors, such
as a.out,
load executable binary images, and, consequently, most load an S-record.
An S-record is a printable ASCII representation of an executable binary
image.
S-records are suitable both for building ROM images for standalone boards and for downloading images to embedded systems. Use the following examples input for this process.
objcopy -O srec infile outfileinfile in the previous examples input is the executable binary filename, and outfile is the filename for the S-record.
Most PROM burners also read S-records or some similar format. Use the following examples input to get a list of supported object file types for your architecture.
objdump -iFor more information on S-records, see the discussions for FORMAT output-format in MRI compatible script files and the general discussion of BFD in Using ld in GNUPro Utilities. For more discussion of making an executable binary image, see objcopy in Using binutils in GNUPro Utilities.
objdump
- objdump
displays information about one or more object files. The options control
what particular information to display. This information is mostly useful
to programmers who are working on the compilation tools, as opposed to
programmers who just want their program to compile and work.
When specifying archives, objdump shows information on each of the member object files. objfile... are the object files to be examined.
A few of the more useful options for commands are: -d, -disassemble and -prefix-addresses.
- Displays the aseembler mnemonics for the machine instructions from objfile. This option only disassembles those sections that are expected to contain instructions.
- For disassembling, prints the complete address on each line, starting each output line with the address its disassembling. This is the older disassembly format. Otherwise, you only get raw opcodes.
|
© 2005 Red Hat, Inc. All rights reserved. About Red Hat : Legal statement : Privacy statement : Contact |