threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
158 lines
3.2 KiB
ArmAsm
158 lines
3.2 KiB
ArmAsm
/*
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* Copyright (C) 2017 MediaTek Inc.
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See http://www.gnu.org/licenses/gpl-2.0.html for more details.
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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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@ fp is 0 or stack frame
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#define frame r4
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#define sv_fp r5
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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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ENTRY(c_backtrace_ramconsole_print)
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#if !defined(CONFIG_FRAME_POINTER) || !defined(CONFIG_PRINTK)
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mov pc, lr
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ENDPROC(c_backtrace_ramconsole_print)
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#else
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stmfd sp!, {r4 - r8, lr}
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movs frame, r0
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beq no_frame
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tst r1, #0x10
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ARM( moveq mask, #0xfc000003 )
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THUMB( moveq mask, #0xfc000000 )
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THUMB( orreq mask, #0x03 )
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movne mask, #0
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1: stmfd sp!, {pc}
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ldr r0, [sp], #4
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adr r1, 1b
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sub offset, r0, r1
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/*
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* Stack frame layout:
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* optionally saved caller registers (r4 - r10)
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* saved fp
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* saved sp
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* saved lr
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* frame => saved pc
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* optionally saved arguments (r0 - r3)
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* saved sp => <next word>
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*
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* Functions start with the following code sequence:
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* mov ip, sp
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* stmfd sp!, {r0 - r3} (optional)
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* corrected pc => stmfd sp!, {..., fp, ip, lr, pc}
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*/
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for_each_frame: tst frame, mask
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bne no_frame
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1001: ldr sv_pc, [frame, #0]
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1002: ldr sv_fp, [frame, #-12]
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sub sv_pc, sv_pc, offset
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bic sv_pc, sv_pc, mask
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1003: ldr r2, [sv_pc, #-4]
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ldr r3, .Ldsi+4
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teq r3, r2, lsr #10
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subne r0, sv_pc, #4
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subeq r0, sv_pc, #8
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ldr r1, [frame, #-4]
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mov r2, frame
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bic r1, r1, mask
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bl dump_backtrace_entry_ramconsole_print
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ldr r1, [sv_pc, #-4]
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ldr r3, .Ldsi+4
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teq r3, r1, lsr #10
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ldreq r0, [frame, #-8]
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subeq r0, r0, #4
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bleq .Ldumpstm
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1004: ldr r1, [sv_pc, #0]
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ldr r3, .Ldsi
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teq r3, r1, lsr #10
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subeq r0, frame, #16
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bleq .Ldumpstm
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teq sv_fp, #0
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beq no_frame
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cmp sv_fp, frame
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mov frame, sv_fp
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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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#ifdef CONFIG_MTK_RAM_CONSOLE
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bl aee_sram_fiq_log
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#endif
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no_frame: ldmfd sp!, {r4 - r8, pc}
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ENDPROC(c_backtrace_ramconsole_print)
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.pushsection __ex_table,"a"
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.align 3
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.long 1001b, 1006b
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.long 1002b, 1006b
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.long 1003b, 1006b
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.long 1004b, 1006b
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.popsection
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#define instr r4
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#define reg r5
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#define stack r6
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.Ldumpstm: stmfd sp!, {instr, reg, stack, r7, lr}
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mov stack, r0
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mov instr, r1
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mov reg, #10
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mov r7, #0
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1: mov r3, #1
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ARM( tst instr, r3, lsl reg )
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THUMB( lsl r3, reg )
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THUMB( tst instr, r3 )
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beq 2f
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add r7, r7, #1
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teq r7, #6
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moveq r7, #1
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moveq r1, #'\n'
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movne r1, #' '
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ldr r3, [stack], #-4
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mov r2, reg
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adr r0, .Lfp
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bl dump_regs
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2: subs reg, reg, #1
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bpl 1b
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teq r7, #0
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adrne r0, .Lcr
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#ifdef CONFIG_MTK_RAM_CONSOLE
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blne aee_sram_fiq_log
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#endif
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ldmfd sp!, {instr, reg, stack, r7, pc}
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.Lfp: .asciz "%cr%d:%08x"
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.Lcr: .asciz "\n"
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.Lbad: .asciz "Backtrace aborted due to bad frame pointer <%p>\n"
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.align
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.Ldsi: .word 0xe92dd800 >> 10
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.word 0xe92d0000 >> 10
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#endif
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