mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/arch/arm/lib/backtrace.S
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@@ -1,14 +1,10 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  *  linux/arch/arm/lib/backtrace.S
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  *
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  *  Copyright (C) 1995, 1996 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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  * 27/03/03 Ian Molton Clean up CONFIG_CPU
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- *
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  */
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 #include <linux/kern_levels.h>
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 #include <linux/linkage.h>
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@@ -22,6 +18,7 @@
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 #define sv_pc	r6
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 #define mask	r7
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 #define offset	r8
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+#define loglvl	r9
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 ENTRY(c_backtrace)
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@@ -29,9 +26,10 @@
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 		ret	lr
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 ENDPROC(c_backtrace)
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 #else
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-		stmfd	sp!, {r4 - r8, lr}	@ Save an extra register so we have a location...
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+		stmfd	sp!, {r4 - r9, lr}	@ Save an extra register so we have a location...
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 		movs	frame, r0		@ if frame pointer is zero
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 		beq	no_frame		@ we have no stack frames
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+		mov	loglvl, r2
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 		tst	r1, #0x10		@ 26 or 32-bit mode?
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  ARM(		moveq	mask, #0xfc000003	)
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@@ -70,13 +68,14 @@
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 1003:		ldr	r2, [sv_pc, #-4]	@ if stmfd sp!, {args} exists,
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 		ldr	r3, .Ldsi+4		@ adjust saved 'pc' back one
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-		teq	r3, r2, lsr #10		@ instruction
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+		teq	r3, r2, lsr #11		@ instruction
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 		subne	r0, sv_pc, #4		@ allow for mov
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 		subeq	r0, sv_pc, #8		@ allow for mov + stmia
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 		ldr	r1, [frame, #-4]	@ get saved lr
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 		mov	r2, frame
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 		bic	r1, r1, mask		@ mask PC/LR for the mode
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+		mov	r3, loglvl
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 		bl	dump_backtrace_entry
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 		ldr	r1, [sv_pc, #-4]	@ if stmfd sp!, {args} exists,
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@@ -84,12 +83,14 @@
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 		teq	r3, r1, lsr #11
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 		ldreq	r0, [frame, #-8]	@ get sp
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 		subeq	r0, r0, #4		@ point at the last arg
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+		mov	r2, loglvl
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 		bleq	dump_backtrace_stm	@ dump saved registers
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 1004:		ldr	r1, [sv_pc, #0]		@ if stmfd sp!, {..., fp, ip, lr, pc}
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 		ldr	r3, .Ldsi		@ instruction exists,
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 		teq	r3, r1, lsr #11
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 		subeq	r0, frame, #16
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+		mov	r2, loglvl
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 		bleq	dump_backtrace_stm	@ dump saved registers
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 		teq	sv_fp, #0		@ zero saved fp means
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@@ -100,9 +101,10 @@
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 		bhi	for_each_frame
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 1006:		adr	r0, .Lbad
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-		mov	r1, frame
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+		mov	r1, loglvl
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+		mov	r2, frame
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 		bl	printk
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-no_frame:	ldmfd	sp!, {r4 - r8, pc}
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+no_frame:	ldmfd	sp!, {r4 - r9, pc}
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 ENDPROC(c_backtrace)
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 		.pushsection __ex_table,"a"
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@@ -113,7 +115,7 @@
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 		.long	1004b, 1006b
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 		.popsection
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-.Lbad:		.asciz	"Backtrace aborted due to bad frame pointer <%p>\n"
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+.Lbad:		.asciz	"%sBacktrace aborted due to bad frame pointer <%p>\n"
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 		.align
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 .Ldsi:		.word	0xe92dd800 >> 11	@ stmfd sp!, {... fp, ip, lr, pc}
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 		.word	0xe92d0000 >> 11	@ stmfd sp!, {}