164 lines
3.7 KiB
ArmAsm
164 lines
3.7 KiB
ArmAsm
/*
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* linux/arch/unicore32/lib/backtrace.S
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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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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#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 v4
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#define sv_fp v5
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#define sv_pc v6
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#define offset v8
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ENTRY(__backtrace)
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mov r0, fp
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ENTRY(c_backtrace)
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#if !defined(CONFIG_FRAME_POINTER) || !defined(CONFIG_PRINTK)
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mov pc, lr
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ENDPROC(__backtrace)
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ENDPROC(c_backtrace)
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#else
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stm.w (v4 - v8, lr), [sp-] @ Save an extra register
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@ so we have a location...
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mov.a frame, r0 @ if frame pointer is zero
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beq no_frame @ we have no stack frames
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1: stm.w (pc), [sp-] @ calculate offset of PC stored
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ldw.w r0, [sp]+, #4 @ by stmfd for this CPU
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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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* stm.w (r0 - r3), [sp-] (optional)
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* corrected pc => stm.w sp, (..., fp, ip, lr, pc)
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*/
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for_each_frame:
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1001: ldw sv_pc, [frame+], #0 @ get saved pc
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1002: ldw sv_fp, [frame+], #-12 @ get saved fp
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sub sv_pc, sv_pc, offset @ Correct PC for prefetching
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1003: ldw r2, [sv_pc+], #-4 @ if stmfd sp, {args} exists,
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ldw r3, .Ldsi+4 @ adjust saved 'pc' back one
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cxor.a r3, r2 >> #14 @ instruction
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beq 201f
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sub r0, sv_pc, #4 @ allow for mov
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b 202f
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201:
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sub r0, sv_pc, #8 @ allow for mov + stmia
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202:
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ldw r1, [frame+], #-4 @ get saved lr
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mov r2, frame
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b.l dump_backtrace_entry
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ldw r1, [sv_pc+], #-4 @ if stmfd sp, {args} exists,
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ldw r3, .Ldsi+4
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cxor.a r3, r1 >> #14
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bne 1004f
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ldw r0, [frame+], #-8 @ get sp
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sub r0, r0, #4 @ point at the last arg
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b.l .Ldumpstm @ dump saved registers
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1004: ldw r1, [sv_pc+], #0 @ if stmfd {, fp, ip, lr, pc}
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ldw r3, .Ldsi @ instruction exists,
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cxor.a r3, r1 >> #14
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bne 201f
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sub r0, frame, #16
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b.l .Ldumpstm @ dump saved registers
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201:
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cxor.a sv_fp, #0 @ zero saved fp means
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beq no_frame @ no further frames
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csub.a sv_fp, frame @ next frame must be
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mov frame, sv_fp @ above the current frame
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bua for_each_frame
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1006: adr r0, .Lbad
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mov r1, frame
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b.l printk
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no_frame: ldm.w (v4 - v8, pc), [sp]+
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ENDPROC(__backtrace)
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ENDPROC(c_backtrace)
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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 v4
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#define reg v5
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#define stack v6
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.Ldumpstm: stm.w (instr, reg, stack, v7, lr), [sp-]
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mov stack, r0
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mov instr, r1
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mov reg, #14
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mov v7, #0
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1: mov r3, #1
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csub.a reg, #8
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bne 201f
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sub reg, reg, #3
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201:
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cand.a instr, r3 << reg
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beq 2f
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add v7, v7, #1
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cxor.a v7, #6
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cmoveq v7, #1
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cmoveq r1, #'\n'
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cmovne r1, #' '
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ldw.w r3, [stack]+, #-4
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mov r2, reg
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csub.a r2, #8
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bsl 201f
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sub r2, r2, #3
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201:
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cand.a instr, #0x40 @ if H is 1, high 16 regs
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beq 201f
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add r2, r2, #0x10 @ so r2 need add 16
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201:
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adr r0, .Lfp
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b.l printk
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2: sub.a reg, reg, #1
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bns 1b
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cxor.a v7, #0
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beq 201f
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adr r0, .Lcr
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b.l printk
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201: ldm.w (instr, reg, stack, v7, pc), [sp]+
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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 0x92eec000 >> 14 @ stm.w sp, (... fp, ip, lr, pc)
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.word 0x92e10000 >> 14 @ stm.w sp, ()
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#endif
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