mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-25 21:24:08 +08:00
6ab3d5624e
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
145 lines
2.9 KiB
ArmAsm
145 lines
2.9 KiB
ArmAsm
/*
|
|
* linux/arch/arm26/lib/backtrace.S
|
|
*
|
|
* Copyright (C) 1995, 1996 Russell King
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
.text
|
|
|
|
@ fp is 0 or stack frame
|
|
|
|
#define frame r4
|
|
#define next r5
|
|
#define save r6
|
|
#define mask r7
|
|
#define offset r8
|
|
|
|
ENTRY(__backtrace)
|
|
mov r1, #0x10
|
|
mov r0, fp
|
|
|
|
ENTRY(c_backtrace)
|
|
|
|
#ifdef CONFIG_NO_FRAME_POINTER
|
|
mov pc, lr
|
|
#else
|
|
|
|
stmfd sp!, {r4 - r8, lr} @ Save an extra register so we have a location...
|
|
mov mask, #0xfc000003
|
|
tst mask, r0
|
|
movne r0, #0
|
|
movs frame, r0
|
|
1: moveq r0, #-2
|
|
LOADREGS(eqfd, sp!, {r4 - r8, pc})
|
|
|
|
2: stmfd sp!, {pc} @ calculate offset of PC in STMIA instruction
|
|
ldr r0, [sp], #4
|
|
adr r1, 2b - 4
|
|
sub offset, r0, r1
|
|
|
|
3: tst frame, mask @ Check for address exceptions...
|
|
bne 1b
|
|
|
|
1001: ldr next, [frame, #-12] @ get fp
|
|
1002: ldr r2, [frame, #-4] @ get lr
|
|
1003: ldr r3, [frame, #0] @ get pc
|
|
sub save, r3, offset @ Correct PC for prefetching
|
|
bic save, save, mask
|
|
1004: ldr r1, [save, #0] @ get instruction at function
|
|
mov r1, r1, lsr #10
|
|
ldr r3, .Ldsi+4
|
|
teq r1, r3
|
|
subeq save, save, #4
|
|
adr r0, .Lfe
|
|
mov r1, save
|
|
bic r2, r2, mask
|
|
bl printk @ print pc and link register
|
|
|
|
ldr r0, [frame, #-8] @ get sp
|
|
sub r0, r0, #4
|
|
1005: ldr r1, [save, #4] @ get instruction at function+4
|
|
mov r3, r1, lsr #10
|
|
ldr r2, .Ldsi+4
|
|
teq r3, r2 @ Check for stmia sp!, {args}
|
|
addeq save, save, #4 @ next instruction
|
|
bleq .Ldumpstm
|
|
|
|
sub r0, frame, #16
|
|
1006: ldr r1, [save, #4] @ Get 'stmia sp!, {rlist, fp, ip, lr, pc}' instruction
|
|
mov r3, r1, lsr #10
|
|
ldr r2, .Ldsi
|
|
teq r3, r2
|
|
bleq .Ldumpstm
|
|
|
|
teq frame, next
|
|
movne frame, next
|
|
teqne frame, #0
|
|
bne 3b
|
|
LOADREGS(fd, sp!, {r4 - r8, pc})
|
|
|
|
/*
|
|
* Fixup for LDMDB
|
|
*/
|
|
.section .fixup,"ax"
|
|
.align 0
|
|
1007: ldr r0, =.Lbad
|
|
mov r1, frame
|
|
bl printk
|
|
LOADREGS(fd, sp!, {r4 - r8, pc})
|
|
.ltorg
|
|
.previous
|
|
|
|
.section __ex_table,"a"
|
|
.align 3
|
|
.long 1001b, 1007b
|
|
.long 1002b, 1007b
|
|
.long 1003b, 1007b
|
|
.long 1004b, 1007b
|
|
.long 1005b, 1007b
|
|
.long 1006b, 1007b
|
|
.previous
|
|
|
|
#define instr r4
|
|
#define reg r5
|
|
#define stack r6
|
|
|
|
.Ldumpstm: stmfd sp!, {instr, reg, stack, r7, lr}
|
|
mov stack, r0
|
|
mov instr, r1
|
|
mov reg, #9
|
|
mov r7, #0
|
|
1: mov r3, #1
|
|
tst instr, r3, lsl reg
|
|
beq 2f
|
|
add r7, r7, #1
|
|
teq r7, #4
|
|
moveq r7, #0
|
|
moveq r3, #'\n'
|
|
movne r3, #' '
|
|
ldr r2, [stack], #-4
|
|
mov r1, reg
|
|
adr r0, .Lfp
|
|
bl printk
|
|
2: subs reg, reg, #1
|
|
bpl 1b
|
|
teq r7, #0
|
|
adrne r0, .Lcr
|
|
blne printk
|
|
mov r0, stack
|
|
LOADREGS(fd, sp!, {instr, reg, stack, r7, pc})
|
|
|
|
.Lfe: .asciz "Function entered at [<%p>] from [<%p>]\n"
|
|
.Lfp: .asciz " r%d = %08X%c"
|
|
.Lcr: .asciz "\n"
|
|
.Lbad: .asciz "Backtrace aborted due to bad frame pointer <%p>\n"
|
|
.align
|
|
.Ldsi: .word 0x00e92dd8 >> 2
|
|
.word 0x00e92d00 >> 2
|
|
|
|
#endif
|