LaunchBank1_2b7.pbp

; This patch changes behaviour of the Back button
; in watchfaces:
; When you press it from any watchface,
; it will launch app installed in bank 0 (the first bank).
; You may choose which app is installed in bank0
; by uninstalling and reinstalling apps in desired order.
;
; This version works with 2.0-BETA7 and BETA6, any HW version.
#ver 197

; just a simple mask to find named proc
08 4b 10 b5 04 46 18 68 08 e0 {
	proc app_manager_get_bank_info 
}

1f b5 04 46 30 b9 0a 48 {
	proc app_manager_launch 
}

; This matches the end of watchface_button_handler proc.
; We replace its POP {R3-R5,LR} with jump.
;
; About mask: '?n' means "skip n bytes"
; (which may have different values in different builds).
; n defaults to 1 if omitted.
; '@' means position to which this mask will resolve
; (defaults to first byte).
; Here we want to match the end of proc
; and replace only its last instruction (with alignment NOP).
; Note that B.W takes 4 bytes, not 2.
00 2c 0c bf 05 20 06 20 BD E8 38 40 ?4 @ 38 BD 00 BF {
	B.W my_code
}

; And this is a cmdAppRemove proc
; (from serial console, thus unused in normal scenario)
; which we replace with our continuation to previous proc.
?6 43 1c 0d d0 c0 b2 ? f0 {
	proc my_code
	CMP R3,5
	BEQ ret
	CMP R0,0
	BNE ret
	MOV R0,0	; bank_id
	BL app_manager_get_bank_info
	CBZ R0, ret
	LDR R0, [R0,0xC]
	BL app_manager_launch
	ret:
	db 38 BD	; POP {R3-R5,PC}
}