_notes.txt

THUMB Binary Opcode Format
(sauce: gbatek; some are arm9 only, we're obviously not handling them!)

Form|_15|_14|_13|_12|_11|_10|_9_|_8_|_7_|_6_|_5_|_4_|_3_|_2_|_1_|_0_|
__1_|_0___0___0_|__Op___|_______Offset______|____Rs_____|____Rd_____|Shifted
__2_|_0___0___0___1___1_|_I,_Op_|___Rn/nn___|____Rs_____|____Rd_____|ADD/SUB
__3_|_0___0___1_|__Op___|____Rd_____|_____________Offset____________|Immedi.
__4_|_0___1___0___0___0___0_|______Op_______|____Rs_____|____Rd_____|AluOp
__5_|_0___1___0___0___0___1_|__Op___|Hd_|Hs_|____Rs_____|____Rd_____|HiReg/BX
__6_|_0___1___0___0___1_|____Rd_____|_____________Word______________|LDR PC
__7_|_0___1___0___1_|__Op___|_0_|___Ro______|____Rb_____|____Rd_____|LDR/STR
__8_|_0___1___0___1_|__Op___|_1_|___Ro______|____Rb_____|____Rd_____|""H/SB/SH
__9_|_0___1___1_|__Op___|_______Offset______|____Rb_____|____Rd_____|""{B}
_10_|_1___0___0___0_|Op_|_______Offset______|____Rb_____|____Rd_____|""H
_11_|_1___0___0___1_|Op_|____Rd_____|_____________Word______________|"" SP
_12_|_1___0___1___0_|Op_|____Rd_____|_____________Word______________|ADD PC/SP
_13_|_1___0___1___1___0___0___0___0_|_S_|___________Word____________|ADD SP,nn
_14_|_1___0___1___1_|Op_|_1___0_|_R_|____________Rlist______________|PUSH/POP
_17_|_1___0___1___1___1___1___1___0_|___________User_Data___________|BKPT ARM9
_15_|_1___1___0___0_|Op_|____Rb_____|____________Rlist______________|STM/LDM
_16_|_1___1___0___1_|_____Cond______|_________Signed_Offset_________|B{cond}
_U__|_1___1___0___1___1___1___1___0_|_____________var_______________|UndefARM9
_17_|_1___1___0___1___1___1___1___1_|___________User_Data___________|SWI
_18_|_1___1___1___0___0_|________________Offset_____________________|B
_19_|_1___1___1___0___1_|_________________________var___________|_0_|BLX.ARM9
_U__|_1___1___1___0___1_|_________________________var___________|_1_|UndefARM9
_19_|_1___1___1___1_|_H_|______________Offset_Low/High______________|BL,BLX