/* SPDX-License-Identifier: GPL-2.0+ */ /* * linux/arch/arm/kernel/debug.S * * Copyright (C) 1994-1999 Russell King * * 32-bit debugging code */ #include #include .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 .macro addruart_current, rx, tmp1, tmp2 addruart \rx, \tmp1, \tmp2 .endm /* * Useful debugging routines */ ENTRY(printhex8) mov r1, #8 b printhex ENDPROC(printhex8) ENTRY(printhex4) mov r1, #4 b printhex ENDPROC(printhex4) ENTRY(printhex2) mov r1, #2 printhex: adr r2, hexbuf 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 printascii ENDPROC(printhex2) hexbuf: .space 16 .ltorg #ifndef CONFIG_DEBUG_SEMIHOSTING ENTRY(printascii) addruart_current r3, r1, r2 b 2f 1: waituart r2, r3 senduart r1, r3 busyuart r2, r3 teq r1, #'\n' moveq r1, #'\r' beq 1b 2: teq r0, #0 ldrneb r1, [r0], #1 teqne r1, #0 bne 1b mov pc, lr ENDPROC(printascii) ENTRY(printch) addruart_current r3, r1, r2 mov r1, r0 mov r0, #0 b 1b ENDPROC(printch) #else ENTRY(printascii) mov r1, r0 mov r0, #0x04 @ SYS_WRITE0 ARM( svc #0x123456 ) THUMB( svc #0xab ) mov pc, lr ENDPROC(printascii) ENTRY(printch) adr r1, hexbuf strb r0, [r1] mov r0, #0x03 @ SYS_WRITEC ARM( svc #0x123456 ) THUMB( svc #0xab ) mov pc, lr ENDPROC(printch) ENTRY(debug_ll_addr) mov r2, #0 str r2, [r0] str r2, [r1] mov pc, lr ENDPROC(debug_ll_addr) #endif