The Official Radare2 Book | страница 34

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Currently there are 136 asm. configuration variables so we do not list them all.

The asm.syntax variable is used to change the flavor of the assembly syntax used by a disassembler engine. To switch between Intel and AT&T representations:

e asm.syntax = intel

e asm.syntax = att

You can also check asm.pseudo, which is an experimental pseudocode view, and asm.esil which outputs ESIL ('Evaluable Strings Intermediate Language'). ESIL's goal is to have a human-readable representation of every opcode semantics. Such representations can be evaluated (interpreted) to emulate effects of individual instructions.

Flags are conceptually similar to bookmarks. They associate a name with a given offset in a file. Flags can be grouped into 'flag spaces'. A flag space is a namespace for flags, grouping together flags of similar characteristics or type. Examples for flag spaces: sections, registers, symbols.

To create a flag:

[0x4A13B8C0]> f flag_name @ offset

You can remove a flag by appending the - character to command. Most commands accept - as argument-prefix as an indication to delete something.

[0x4A13B8C0]> f-flag_name

To switch between or create new flagspaces use the fs command:

[0x00005310]> fs?

|Usage: fs [*] [+-][flagspace|addr] # Manage flagspaces

| fs display flagspaces

| fs* display flagspaces as r2 commands

| fsj display flagspaces in JSON

| fs * select all flagspaces

| fs flagspace select flagspace or create if it doesn't exist

| fs-flagspace remove flagspace

| fs-* remove all flagspaces

| fs+foo push previous flagspace and set

| fs- pop to the previous flagspace

| fs-. remove the current flagspace

| fsq list flagspaces in quiet mode

| fsm [addr] move flags at given address to the current flagspace

| fss display flagspaces stack

| fss* display flagspaces stack in r2 commands

| fssj display flagspaces stack in JSON

| fsr newname rename selected flagspace

[0x00005310]> fs

0 439 * strings

1 17 * symbols

2 54 * sections

3 20 * segments

4 115 * relocs

5 109 * imports

[0x00005310]>

Here there are some command examples:

[0x4A13B8C0]> fs symbols ; select only flags in symbols flagspace

[0x4A13B8C0]> f ; list only flags in symbols flagspace

[0x4A13B8C0]> fs * ; select all flagspaces

[0x4A13B8C0]> f myflag ; create a new flag called 'myflag'