A REPL for assembly.
Type some assembly instructions and immediatly see which registers were changed.
Currently only supports i386 and x86_64 on OS X.
Also see https://asciinema.org/a/19605.
- Install radare2.
make./asm_repl(make run32ormake run64to choose a specific architecture)
You need to codesign asm_repl binary or run it as root as we have to access the process we're running the assembly code in. You can codesign the binary so it can use task_for_pid without root by creating a certificate named task_for_pid using the guide here and then running make.
Valid input:
Help:
? - show this help
?[cmd] - show help for a command
Commands:
.set - change value of register
.read - read from memory
.write - write hex to memory
.writestr - write string to memory
.alloc - allocate memory
.regs - show the contents of the registers
.show - toggle shown register types
Any other input will be interpreted as x86_64 assembly
Usage: .set register value
Changes the value of a register
register - register name (GPR, FPR or status)
value - hex if GPR or FPR, 0 or 1 if status
Usage: .read address [len]
Displays a hexdump of memory starting at address
address - an integer or a register name
len - the amount of bytes to read
Usage: .write address hexpairs
Writes hexpairs to a destination address
address - an integer or a register name
hexpairs - pairs of hexadecimal numbers
Usage: .writestr address string
Writes an ascii string to a destination address
address - an integer or a register name
string - an ascii string
Usage: .alloc len
Allocates some memory and returns the address
len - the amount of bytes to allocate
Usage: .regs
Displays the values of the registers currently toggled on
Usage: .show [gpr|status|fpr_hex|fpr_double]
Toggles which types of registers are shown
gpr - General purpose registers (rax, rsp, rip, ...)
status - Status registers (CF, ZF, ...)
fpr_hex - Floating point registers shown in hex (xmm0, xmm1, ...)
fpr_double - Floating point registers shown as doubles
- Use a library (libr?) for assembling instead of reading the output of running
rasm2. - Support more architectures (arm).
- Support more platforms (linux).
- Arithmetic for commands (
.read rip-0x10). - Variables to specific memory addresses (
.alloc 4=>.write $alloc 12345678).