[0x00000000]> bf sym.main # block size = sizeof(sym.main)
[0x00000000]> pD @ sym.main # disassemble sym.main
You can combine two operations in a single pdf command. Except that pdf neither uses nor affects global block size.
[0x00000000]> pdf @ sym.main # disassemble sym.main
Another way around is to use special variables $FB and $FS which denote Function's Beginning and Size at the current seek. Read more about Usable variables.
[0x00000000]> s sym.main + 0x04
[0x00001ec9]> pD @ $FB !$FS # disassemble current function
╭ 211: int main (int argc, char **argv, char **envp);
│ 0x00001ec5 55 push rbp
│ 0x00001ec6 4889e5 mov rbp, rsp
│ 0x00001ec9 4881ecc0000000 sub rsp, 0xc0
...
╰ 0x00001f97 c3 ret
Note: don't put space after ! size designator. See also Command Format.
The concept of sections is tied to the information extracted from the binary. We can display this information by using the i command.
Displaying information about sections:
[0x00005310]> iS
[Sections]
00 0x00000000 0 0x00000000 0 ----
01 0x00000238 28 0x00000238 28 -r-- .interp
02 0x00000254 32 0x00000254 32 -r-- .note.ABI_tag
03 0x00000278 176 0x00000278 176 -r-- .gnu.hash
04 0x00000328 3000 0x00000328 3000 -r-- .dynsym
05 0x00000ee0 1412 0x00000ee0 1412 -r-- .dynstr
06 0x00001464 250 0x00001464 250 -r-- .gnu.version
07 0x00001560 112 0x00001560 112 -r-- .gnu.version_r
08 0x000015d0 4944 0x000015d0 4944 -r-- .rela.dyn
09 0x00002920 2448 0x00002920 2448 -r-- .rela.plt
10 0x000032b0 23 0x000032b0 23 -r-x .init
...
As you may know, binaries have sections and maps. The sections define the contents of a portion of the file that can be mapped in memory (or not). What is mapped is defined by the segments.
Before the IO refactoring done by condret, the S command was used to manage what we now call maps. Currently the S command is deprecated because iS and om should be enough.
Firmware images, bootloaders and binary files usually place various sections of a binary at different addresses in memory. To represent this behavior, radare offers the iS. Use iS? to get the help message. To list all created sections use iS (or iSj to get the json format). The iS= will show the region bars in ascii-art.
You can create a new mapping using the om subcommand as follows:
om fd vaddr [size] [paddr] [rwx] [name]
