/* SPDX-License-Identifier: GPL-2.0-only *//* *  linux/arch/arm/kernel/debug.S * *  Copyright (C) 1994-1999 Russell King * *  32-bit debugging code */#include <linux/linkage.h>#include <asm/assembler.h> 		.text /* * Some debugging routines (useful if you've got MM problems and * printk isn't working).  For DEBUGGING ONLY!!!  Do not leave * references to these in a production kernel! */ #if !defined(CONFIG_DEBUG_SEMIHOSTING)#include CONFIG_DEBUG_LL_INCLUDE#endif #ifdef CONFIG_MMU		.macro	addruart_current, rx, tmp1, tmp2		addruart	\tmp1, \tmp2, \rx		mrc		p15, 0, \rx, c1, c0		tst		\rx, #1		moveq		\rx, \tmp1		movne		\rx, \tmp2		.endm #else /* !CONFIG_MMU */		.macro	addruart_current, rx, tmp1, tmp2		addruart	\rx, \tmp1, \tmp2		.endm #endif /* CONFIG_MMU */ /* * Useful debugging routines */ENTRY(printhex8)		mov	r1, #8		b	printhexENDPROC(printhex8) ENTRY(printhex4)		mov	r1, #4		b	printhexENDPROC(printhex4) ENTRY(printhex2)		mov	r1, #2printhex:	adr	r2, hexbuf_rel		ldr	r3, [r2]		add	r2, r2, r3		add	r3, r2, r1		mov	r1, #0		strb	r1, [r3]1:		and	r1, r0, #15		mov	r0, r0, lsr #4		cmp	r1, #10		addlt	r1, r1, #'0'		addge	r1, r1, #'a' - 10		strb	r1, [r3, #-1]!		teq	r3, r2		bne	1b		mov	r0, r2		b	printasciiENDPROC(printhex2) 		.pushsection .bsshexbuf_addr:	.space 16		.popsection		.alignhexbuf_rel:	.long	hexbuf_addr - . 		.ltorg #ifndef CONFIG_DEBUG_SEMIHOSTING ENTRY(printascii)		addruart_current r3, r1, r21:		teq	r0, #0		ldrbne	r1, [r0], #1		teqne	r1, #0		reteq	lr2:		teq     r1, #'\n'		bne	3f		mov	r1, #'\r'#ifdef CONFIG_DEBUG_UART_FLOW_CONTROL		waituartcts r2, r3#endif		waituarttxrdy r2, r3		senduart r1, r3		busyuart r2, r3		mov	r1, #'\n'3:#ifdef CONFIG_DEBUG_UART_FLOW_CONTROL		waituartcts r2, r3#endif		waituarttxrdy r2, r3		senduart r1, r3		busyuart r2, r3		b	1bENDPROC(printascii) ENTRY(printch)		addruart_current r3, r1, r2		mov	r1, r0		mov	r0, #0		b	2bENDPROC(printch) #ifdef CONFIG_MMUENTRY(debug_ll_addr)		addruart r2, r3, ip		str	r2, [r0]		str	r3, [r1]		ret	lrENDPROC(debug_ll_addr)#endif #else ENTRY(printascii)		mov	r1, r0		mov	r0, #0x04		@ SYS_WRITE0	ARM(	svc	#0x123456	)#ifdef CONFIG_CPU_V7M	THUMB(	bkpt	#0xab		)#else	THUMB(	svc	#0xab		)#endif		ret	lrENDPROC(printascii) ENTRY(printch)		adr	r1, hexbuf_rel		ldr	r2, [r1]		add	r1, r1, r2		strb	r0, [r1]		mov	r0, #0x03		@ SYS_WRITEC	ARM(	svc	#0x123456	)#ifdef CONFIG_CPU_V7M	THUMB(	bkpt	#0xab		)#else	THUMB(	svc	#0xab		)#endif		ret	lrENDPROC(printch) ENTRY(debug_ll_addr)		mov	r2, #0		str	r2, [r0]		str	r2, [r1]		ret	lrENDPROC(debug_ll_addr) #endif