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