arm assembler bugs

[plutooo]

"mvn" gets assembled to "mov":

$ rasm2 -a arm "mvneq r3, #1"
0130a003
$ rasm2 -d -a arm 0130a003
moveq r3, #1 ; 0x1

"cmp" is broken:

$ rasm2 -a arm "cmp r3, #0x400"
ff0043e1
$ rasm2 -d -a arm ff0043e1
strd r0, [r3, #-15]

"swp" instructions are not implemented.

s-flag not working:

$ rasm2 -a arm "movs r5, r8"
0850a0e1
$ rasm2 -a arm -d 0850a0e1
mov r5, r8

[radare]

Which version of r2 are you using? is this from git? you should pass -b32 if you want to disassemble ARM32, otherwise it defaults to your system bits (x86-64 will be arm64 if only used -aarm)

Also, the '#' is not a valid char in the r2 disasm, in fact it gives no useful information to the reader, so i decided to remove it, because it conflicts with the comment char used by r2 commands and rasm2 files. So instead of using 'mvneq r3, #1' use 'movneq r3,1'.

That first example works fine:

$ rasm2 -b32 -aarm -D `rasm2 -aarm -b32 'mvneq r3, 1'`
0x00000000   4                 0130e003  mvneq r3, 1

"mvn" gets assembled to "mov": < ---- this is fixed/works fine here

$ rasm2 -a arm "mvneq r3, #1"
0130a003
$ rasm2 -d -a arm 0130a003
moveq r3, #1 ; 0x1

I have recently pushed a fix for that. 'cmp' should work fine now

"cmp" is broken: <- not anymore

$ rasm2 -a arm "cmp r3, #0x400"
ff0043e1
$ rasm2 -d -a arm ff0043e1
strd r0, [r3, #-15]

"swp" instructions are not implemented.

---> i have implemented the 'swp' instruction

I have also implemented 'movs'

s-flag not working:

$ rasm2 -a arm "movs r5, r8"
0850a0e1
$ rasm2 -a arm -d 0850a0e1
mov r5, r8