2005-04-17 02:20:36 +04:00
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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2012-03-10 20:30:31 +04:00
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#include <asm/assembler.h>
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2005-04-17 02:20:36 +04:00
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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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2012-08-31 09:03:46 +04:00
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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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2005-04-17 02:20:36 +04:00
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2010-07-06 14:30:06 +04:00
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#ifdef CONFIG_MMU
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.macro addruart_current, rx, tmp1, tmp2
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2011-09-01 06:55:46 +04:00
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addruart \tmp1, \tmp2, \rx
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2010-07-06 14:30:06 +04:00
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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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2015-05-20 01:03:50 +03:00
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addruart \rx, \tmp1, \tmp2
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2010-07-06 14:30:06 +04:00
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.endm
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#endif /* CONFIG_MMU */
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2005-04-17 02:20:36 +04:00
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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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2008-08-28 14:22:32 +04:00
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ENDPROC(printhex8)
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2005-04-17 02:20:36 +04:00
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ENTRY(printhex4)
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mov r1, #4
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b printhex
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2008-08-28 14:22:32 +04:00
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ENDPROC(printhex4)
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2005-04-17 02:20:36 +04:00
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ENTRY(printhex2)
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mov r1, #2
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2017-10-06 21:36:58 +03:00
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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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2005-04-17 02:20:36 +04:00
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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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2008-08-28 14:22:32 +04:00
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ENDPROC(printhex2)
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2005-04-17 02:20:36 +04:00
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2017-10-06 21:36:58 +03:00
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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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2011-10-20 22:32:07 +04:00
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2005-04-17 02:20:36 +04:00
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.ltorg
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2012-02-23 00:58:03 +04:00
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#ifndef CONFIG_DEBUG_SEMIHOSTING
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2005-04-17 02:20:36 +04:00
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ENTRY(printascii)
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2010-07-06 14:30:06 +04:00
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addruart_current r3, r1, r2
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2017-11-02 23:58:41 +03:00
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1: teq r0, #0
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2005-04-17 02:20:36 +04:00
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ldrneb r1, [r0], #1
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teqne r1, #0
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2017-11-02 23:58:41 +03:00
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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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2008-08-28 14:22:32 +04:00
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ENDPROC(printascii)
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2005-04-17 02:20:36 +04:00
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ENTRY(printch)
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2010-07-06 14:30:06 +04:00
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addruart_current r3, r1, r2
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2005-04-17 02:20:36 +04:00
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mov r1, r0
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mov r0, #0
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2017-11-02 23:58:41 +03:00
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b 2b
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2008-08-28 14:22:32 +04:00
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ENDPROC(printch)
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2012-02-23 00:58:03 +04:00
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2013-01-16 18:32:06 +04:00
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#ifdef CONFIG_MMU
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ARM: implement debug_ll_io_init()
When using DEBUG_LL, the UART's (or other HW's) registers are mapped
into early page tables based on the results of assembly macro addruart.
Later, when the page tables are replaced, the same virtual address must
remain valid. Historically, this has been ensured by using defines from
<mach/iomap.h> in both the implementation of addruart, and the machine's
.map_io() function. However, with the move to single zImage, we wish to
remove <mach/iomap.h>. To enable this, the macro addruart may be used
when constructing the late page tables too; addruart is exposed as a
C function debug_ll_addr(), and used to set up the required mapping in
debug_ll_io_init(), which may called on an opt-in basis from a machine's
.map_io() function.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
[swarren: Mask map.virtual with PAGE_MASK. Checked for NULL results from
debug_ll_addr (e.g. when selected UART isn't valid). Fixed compile when
either !CONFIG_DEBUG_LL or CONFIG_DEBUG_SEMIHOSTING.]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
2012-10-22 21:42:54 +04:00
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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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2014-06-30 19:29:12 +04:00
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ret lr
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ARM: implement debug_ll_io_init()
When using DEBUG_LL, the UART's (or other HW's) registers are mapped
into early page tables based on the results of assembly macro addruart.
Later, when the page tables are replaced, the same virtual address must
remain valid. Historically, this has been ensured by using defines from
<mach/iomap.h> in both the implementation of addruart, and the machine's
.map_io() function. However, with the move to single zImage, we wish to
remove <mach/iomap.h>. To enable this, the macro addruart may be used
when constructing the late page tables too; addruart is exposed as a
C function debug_ll_addr(), and used to set up the required mapping in
debug_ll_io_init(), which may called on an opt-in basis from a machine's
.map_io() function.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
[swarren: Mask map.virtual with PAGE_MASK. Checked for NULL results from
debug_ll_addr (e.g. when selected UART isn't valid). Fixed compile when
either !CONFIG_DEBUG_LL or CONFIG_DEBUG_SEMIHOSTING.]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
2012-10-22 21:42:54 +04:00
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ENDPROC(debug_ll_addr)
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2013-01-16 18:32:06 +04:00
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#endif
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ARM: implement debug_ll_io_init()
When using DEBUG_LL, the UART's (or other HW's) registers are mapped
into early page tables based on the results of assembly macro addruart.
Later, when the page tables are replaced, the same virtual address must
remain valid. Historically, this has been ensured by using defines from
<mach/iomap.h> in both the implementation of addruart, and the machine's
.map_io() function. However, with the move to single zImage, we wish to
remove <mach/iomap.h>. To enable this, the macro addruart may be used
when constructing the late page tables too; addruart is exposed as a
C function debug_ll_addr(), and used to set up the required mapping in
debug_ll_io_init(), which may called on an opt-in basis from a machine's
.map_io() function.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
[swarren: Mask map.virtual with PAGE_MASK. Checked for NULL results from
debug_ll_addr (e.g. when selected UART isn't valid). Fixed compile when
either !CONFIG_DEBUG_LL or CONFIG_DEBUG_SEMIHOSTING.]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
2012-10-22 21:42:54 +04:00
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2012-02-23 00:58:03 +04:00
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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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2017-10-06 21:39:57 +03:00
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#ifdef CONFIG_CPU_V7M
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THUMB( bkpt #0xab )
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#else
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2012-02-23 00:58:03 +04:00
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THUMB( svc #0xab )
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2017-10-06 21:39:57 +03:00
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#endif
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2014-06-30 19:29:12 +04:00
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ret lr
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2012-02-23 00:58:03 +04:00
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ENDPROC(printascii)
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ENTRY(printch)
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2017-10-06 21:36:58 +03:00
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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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2012-02-23 00:58:03 +04:00
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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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2017-10-06 21:39:57 +03:00
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#ifdef CONFIG_CPU_V7M
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THUMB( bkpt #0xab )
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#else
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2012-02-23 00:58:03 +04:00
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THUMB( svc #0xab )
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2017-10-06 21:39:57 +03:00
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#endif
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2014-06-30 19:29:12 +04:00
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ret lr
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2012-02-23 00:58:03 +04:00
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ENDPROC(printch)
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ARM: implement debug_ll_io_init()
When using DEBUG_LL, the UART's (or other HW's) registers are mapped
into early page tables based on the results of assembly macro addruart.
Later, when the page tables are replaced, the same virtual address must
remain valid. Historically, this has been ensured by using defines from
<mach/iomap.h> in both the implementation of addruart, and the machine's
.map_io() function. However, with the move to single zImage, we wish to
remove <mach/iomap.h>. To enable this, the macro addruart may be used
when constructing the late page tables too; addruart is exposed as a
C function debug_ll_addr(), and used to set up the required mapping in
debug_ll_io_init(), which may called on an opt-in basis from a machine's
.map_io() function.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
[swarren: Mask map.virtual with PAGE_MASK. Checked for NULL results from
debug_ll_addr (e.g. when selected UART isn't valid). Fixed compile when
either !CONFIG_DEBUG_LL or CONFIG_DEBUG_SEMIHOSTING.]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
2012-10-22 21:42:54 +04:00
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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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2014-06-30 19:29:12 +04:00
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ret lr
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ARM: implement debug_ll_io_init()
When using DEBUG_LL, the UART's (or other HW's) registers are mapped
into early page tables based on the results of assembly macro addruart.
Later, when the page tables are replaced, the same virtual address must
remain valid. Historically, this has been ensured by using defines from
<mach/iomap.h> in both the implementation of addruart, and the machine's
.map_io() function. However, with the move to single zImage, we wish to
remove <mach/iomap.h>. To enable this, the macro addruart may be used
when constructing the late page tables too; addruart is exposed as a
C function debug_ll_addr(), and used to set up the required mapping in
debug_ll_io_init(), which may called on an opt-in basis from a machine's
.map_io() function.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
[swarren: Mask map.virtual with PAGE_MASK. Checked for NULL results from
debug_ll_addr (e.g. when selected UART isn't valid). Fixed compile when
either !CONFIG_DEBUG_LL or CONFIG_DEBUG_SEMIHOSTING.]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
2012-10-22 21:42:54 +04:00
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ENDPROC(debug_ll_addr)
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2012-02-23 00:58:03 +04:00
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#endif
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