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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | /* * linux/arch/arm/lib/backtrace.S * * Copyright (C) 1995, 1996 Russell King */ #include <linux/config.h> #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) stmfd sp!, {r4 - r8, lr} @ Save an extra register so we have a location... #ifdef CONFIG_CPU_32 tst r1, #0x10 @ 26 or 32-bit? moveq mask, #0xfc000003 movne mask, #0 #else mov mask, #0xfc000003 #endif 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 ldmda frame, {r0, r1, r2, r3} @ fp, sp, lr, pc mov next, r0 sub save, r3, offset @ Correct PC for prefetching bic save, save, mask adr r0, .Lfe mov r1, save bic r2, r2, mask bl SYMBOL_NAME(printk) sub r0, frame, #16 ldr r1, [save, #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 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}) #define instr r4 #define reg r5 #define stack r6 .Ldumpstm: stmfd sp!, {instr, reg, stack, lr} mov stack, r0 mov instr, r1 mov reg, #9 1: mov r3, #1 tst instr, r3, lsl reg beq 2f ldr r2, [stack], #-4 mov r1, reg adr r0, .Lfp bl SYMBOL_NAME(printk) 2: subs reg, reg, #1 bpl 1b mov r0, stack LOADREGS(fd, sp!, {instr, reg, stack, pc}) .Lfe: .ascii "Function entered at [<%p>] from [<%p>]\n" .byte 0 .Lfp: .ascii " r%d = %p\n" .byte 0 .align .Ldsi: .word 0x00e92dd8 >> 2 .word 0x00e92d00 >> 2 |