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Date: Wed, 24 Nov 2010 17:03:02 -0500
From: Sergey Lapin <slapin@...fans.org>
To: Jiri Slaby <jslaby@...e.cz>
Cc: linux-kernel@...r.kernel.org
Subject: Re: ldisc problems with 2.6.32-2.6.37-rc2 (at least)
On Wed, Nov 24, 2010 at 08:45:23PM +0100, Jiri Slaby wrote:
> On 11/24/2010 08:43 PM, Jiri Slaby wrote:
> > Could you provide disassembly of tty_set_ldisc? E.g. by extracting it from:
> > objdump -d drivers/tty/tty_ldisc.o
>
> Or maybe better after linking:
> objdump -d vmlinux
>
> thanks,
> --
> js
> suse labs
Disassembly of tty_set_ldisc
c01bbde8 <tty_set_ldisc>:
c01bbde8: e92d4ff0 push {r4, r5, r6, r7, r8, r9, sl, fp, lr}
c01bbdec: e1a04000 mov r4, r0
c01bbdf0: e1a00001 mov r0, r1
c01bbdf4: e1a0b001 mov fp, r1
c01bbdf8: e24dd054 sub sp, sp, #84 ; 0x54
c01bbdfc: ebfffe31 bl c01bb6c8 <tty_ldisc_get>
c01bbe00: e3700a01 cmn r0, #4096 ; 0x1000
c01bbe04: e1a06000 mov r6, r0
c01bbe08: 81a05000 movhi r5, r0
c01bbe0c: 8a000100 bhi c01bc214 <tty_set_ldisc+0x42c>
c01bbe10: eb06eb04 bl c0376a28 <tty_lock>
c01bbe14: e5943024 ldr r3, [r4, #36] ; 0x24
c01bbe18: e59480a0 ldr r8, [r4, #160] ; 0xa0
c01bbe1c: e5933000 ldr r3, [r3]
c01bbe20: e5933008 ldr r3, [r3, #8]
c01bbe24: e153000b cmp r3, fp
c01bbe28: 1a000004 bne c01bbe40 <tty_set_ldisc+0x58>
c01bbe2c: eb06eae8 bl c03769d4 <tty_unlock>
c01bbe30: e1a00006 mov r0, r6
c01bbe34: ebfffeac bl c01bb8ec <put_ldisc>
c01bbe38: e3a05000 mov r5, #0
c01bbe3c: ea0000f4 b c01bc214 <tty_set_ldisc+0x42c>
c01bbe40: eb06eae3 bl c03769d4 <tty_unlock>
c01bbe44: e2847018 add r7, r4, #24
c01bbe48: e1a00004 mov r0, r4
c01bbe4c: e3a01000 mov r1, #0
c01bbe50: ebfffa07 bl c01ba674 <tty_wait_until_sent>
c01bbe54: eb06eaf3 bl c0376a28 <tty_lock>
c01bbe58: e1a00007 mov r0, r7
c01bbe5c: e284a088 add sl, r4, #136 ; 0x88
c01bbe60: eb06e62e bl c0375720 <mutex_lock>
c01bbe64: e1a0300d mov r3, sp
c01bbe68: e3c35d7f bic r5, r3, #8128 ; 0x1fc0
c01bbe6c: e3c5503f bic r5, r5, #63 ; 0x3f
c01bbe70: ea000023 b c01bbf04 <tty_set_ldisc+0x11c>
c01bbe74: e1a00007 mov r0, r7
c01bbe78: eb06e5d5 bl c03755d4 <mutex_unlock>
c01bbe7c: eb06ead4 bl c03769d4 <tty_unlock>
c01bbe80: e59a3000 ldr r3, [sl]
c01bbe84: e3130b01 tst r3, #1024 ; 0x400
c01bbe88: 0a00001a beq c01bbef8 <tty_set_ldisc+0x110>
c01bbe8c: e595300c ldr r3, [r5, #12]
c01bbe90: e28d9010 add r9, sp, #16
c01bbe94: e1a00009 mov r0, r9
c01bbe98: e3a01000 mov r1, #0
c01bbe9c: e3a02014 mov r2, #20
c01bbea0: e289900c add r9, r9, #12
c01bbea4: e58d3004 str r3, [sp, #4]
c01bbea8: ebff5fb4 bl c0193d80 <memset>
c01bbeac: e59d3004 ldr r3, [sp, #4]
c01bbeb0: e58d901c str r9, [sp, #28]
c01bbeb4: e58d9020 str r9, [sp, #32]
c01bbeb8: e58d3014 str r3, [sp, #20]
c01bbebc: e59f335c ldr r3, [pc, #860] ; c01bc220 <tty_set_ldisc+0x438>
c01bbec0: e58d3018 str r3, [sp, #24]
c01bbec4: e28d9010 add r9, sp, #16
c01bbec8: e3a02002 mov r2, #2
c01bbecc: e59f0350 ldr r0, [pc, #848] ; c01bc224 <tty_set_ldisc+0x43c>
c01bbed0: e1a01009 mov r1, r9
c01bbed4: ebfa50f5 bl c00502b0 <prepare_to_wait>
c01bbed8: e59a3000 ldr r3, [sl]
c01bbedc: e3130b01 tst r3, #1024 ; 0x400
c01bbee0: 0a000001 beq c01bbeec <tty_set_ldisc+0x104>
c01bbee4: eb06e1e4 bl c037467c <schedule>
c01bbee8: eafffff5 b c01bbec4 <tty_set_ldisc+0xdc>
c01bbeec: e59f0330 ldr r0, [pc, #816] ; c01bc224 <tty_set_ldisc+0x43c>
c01bbef0: e1a01009 mov r1, r9
c01bbef4: ebfa509e bl c0050174 <finish_wait>
c01bbef8: eb06eaca bl c0376a28 <tty_lock>
c01bbefc: e1a00007 mov r0, r7
c01bbf00: eb06e606 bl c0375720 <mutex_lock>
c01bbf04: e59a3000 ldr r3, [sl]
c01bbf08: e2133b01 ands r3, r3, #1024 ; 0x400
c01bbf0c: 1affffd8 bne c01bbe74 <tty_set_ldisc+0x8c>
c01bbf10: e10f2000 mrs r2, CPSR
c01bbf14: e3821080 orr r1, r2, #128 ; 0x80
c01bbf18: e121f001 msr CPSR_c, r1
c01bbf1c: e5941088 ldr r1, [r4, #136] ; 0x88
c01bbf20: e3811b01 orr r1, r1, #1024 ; 0x400
c01bbf24: e5841088 str r1, [r4, #136] ; 0x88
c01bbf28: e121f002 msr CPSR_c, r2
c01bbf2c: e584309c str r3, [r4, #156] ; 0x9c
c01bbf30: e594a024 ldr sl, [r4, #36] ; 0x24
c01bbf34: eb06eaa6 bl c03769d4 <tty_unlock>
c01bbf38: e1a00004 mov r0, r4
c01bbf3c: ebfffe1f bl c01bb7c0 <tty_ldisc_halt>
c01bbf40: e3580000 cmp r8, #0
c01bbf44: 058d8008 streq r8, [sp, #8]
c01bbf48: e58d000c str r0, [sp, #12]
c01bbf4c: 0a000002 beq c01bbf5c <tty_set_ldisc+0x174>
c01bbf50: e1a00008 mov r0, r8
c01bbf54: ebfffe19 bl c01bb7c0 <tty_ldisc_halt>
c01bbf58: e58d0008 str r0, [sp, #8]
c01bbf5c: e1a00007 mov r0, r7
c01bbf60: eb06e59b bl c03755d4 <mutex_unlock>
c01bbf64: ebfa402c bl c004c01c <flush_scheduled_work>
c01bbf68: e5943024 ldr r3, [r4, #36] ; 0x24
c01bbf6c: e5933004 ldr r3, [r3, #4]
c01bbf70: e3530001 cmp r3, #1
c01bbf74: 0a00002a beq c01bc024 <tty_set_ldisc+0x23c>
c01bbf78: e1a0300d mov r3, sp
c01bbf7c: e28d5010 add r5, sp, #16
c01bbf80: e3c39d7f bic r9, r3, #8128 ; 0x1fc0
c01bbf84: e1a00005 mov r0, r5
c01bbf88: e3c9903f bic r9, r9, #63 ; 0x3f
c01bbf8c: e3a01000 mov r1, #0
c01bbf90: e599300c ldr r3, [r9, #12]
c01bbf94: e3a02014 mov r2, #20
c01bbf98: e285500c add r5, r5, #12
c01bbf9c: e58d3004 str r3, [sp, #4]
c01bbfa0: ebff5f76 bl c0193d80 <memset>
c01bbfa4: e59d3004 ldr r3, [sp, #4]
c01bbfa8: e58d501c str r5, [sp, #28]
c01bbfac: e58d5020 str r5, [sp, #32]
c01bbfb0: e3a05f7d mov r5, #500 ; 0x1f4
c01bbfb4: e58d3014 str r3, [sp, #20]
c01bbfb8: e59f3260 ldr r3, [pc, #608] ; c01bc220 <tty_set_ldisc+0x438>
c01bbfbc: e58d3018 str r3, [sp, #24]
c01bbfc0: e59f0260 ldr r0, [pc, #608] ; c01bc228 <tty_set_ldisc+0x440>
c01bbfc4: e28d1010 add r1, sp, #16
c01bbfc8: e3a02001 mov r2, #1
c01bbfcc: ebfa50b7 bl c00502b0 <prepare_to_wait>
c01bbfd0: e5943024 ldr r3, [r4, #36] ; 0x24
c01bbfd4: e5933004 ldr r3, [r3, #4]
c01bbfd8: e3530001 cmp r3, #1
c01bbfdc: 0a000009 beq c01bc008 <tty_set_ldisc+0x220>
c01bbfe0: e599300c ldr r3, [r9, #12]
c01bbfe4: e5933004 ldr r3, [r3, #4]
c01bbfe8: e5933000 ldr r3, [r3]
c01bbfec: e3130001 tst r3, #1
c01bbff0: 159f5234 ldrne r5, [pc, #564] ; c01bc22c <tty_set_ldisc+0x444>
c01bbff4: 1a000003 bne c01bc008 <tty_set_ldisc+0x220>
c01bbff8: e1a00005 mov r0, r5
c01bbffc: eb06e42f bl c03750c0 <schedule_timeout>
c01bc000: e2505000 subs r5, r0, #0
c01bc004: 1affffed bne c01bbfc0 <tty_set_ldisc+0x1d8>
c01bc008: e59f0218 ldr r0, [pc, #536] ; c01bc228 <tty_set_ldisc+0x440>
c01bc00c: e28d1010 add r1, sp, #16
c01bc010: ebfa5057 bl c0050174 <finish_wait>
c01bc014: e3550000 cmp r5, #0
c01bc018: ba000002 blt c01bc028 <tty_set_ldisc+0x240>
c01bc01c: 03e0500f mvneq r5, #15
c01bc020: 0a000000 beq c01bc028 <tty_set_ldisc+0x240>
c01bc024: e3a05000 mov r5, #0
c01bc028: eb06ea7e bl c0376a28 <tty_lock>
c01bc02c: e1a00007 mov r0, r7
c01bc030: eb06e5ba bl c0375720 <mutex_lock>
c01bc034: e3550000 cmp r5, #0
c01bc038: 11a00006 movne r0, r6
c01bc03c: 1a00005e bne c01bc1bc <tty_set_ldisc+0x3d4>
c01bc040: e5943088 ldr r3, [r4, #136] ; 0x88
c01bc044: e3130701 tst r3, #262144 ; 0x40000
c01bc048: 0a00000d beq c01bc084 <tty_set_ldisc+0x29c>
c01bc04c: e10f3000 mrs r3, CPSR
c01bc050: e3832080 orr r2, r3, #128 ; 0x80
c01bc054: e121f002 msr CPSR_c, r2
c01bc058: e5942088 ldr r2, [r4, #136] ; 0x88
c01bc05c: e3c22b01 bic r2, r2, #1024 ; 0x400
c01bc060: e5842088 str r2, [r4, #136] ; 0x88
c01bc064: e121f003 msr CPSR_c, r3
c01bc068: e1a00007 mov r0, r7
c01bc06c: eb06e558 bl c03755d4 <mutex_unlock>
c01bc070: e1a00006 mov r0, r6
c01bc074: ebfffe1c bl c01bb8ec <put_ldisc>
c01bc078: e3e05004 mvn r5, #4
c01bc07c: eb06ea54 bl c03769d4 <tty_unlock>
c01bc080: ea000063 b c01bc214 <tty_set_ldisc+0x42c>
c01bc084: e1a00004 mov r0, r4
c01bc088: e1a0100a mov r1, sl
c01bc08c: ebfffdd6 bl c01bb7ec <tty_ldisc_close>
c01bc090: e1a00004 mov r0, r4
c01bc094: e1a01006 mov r1, r6
c01bc098: ebfffcae bl c01bb358 <tty_ldisc_assign>
c01bc09c: e1a00004 mov r0, r4
c01bc0a0: e1a0100b mov r1, fp
c01bc0a4: ebfffdba bl c01bb794 <tty_set_termios_ldisc>
c01bc0a8: e1a00004 mov r0, r4
c01bc0ac: e1a01006 mov r1, r6
c01bc0b0: ebfffde6 bl c01bb850 <tty_ldisc_open>
c01bc0b4: e2505000 subs r5, r0, #0
c01bc0b8: aa000031 bge c01bc184 <tty_set_ldisc+0x39c>
c01bc0bc: e1a00006 mov r0, r6
c01bc0c0: ebfffe09 bl c01bb8ec <put_ldisc>
c01bc0c4: e59a3000 ldr r3, [sl]
c01bc0c8: e5930008 ldr r0, [r3, #8]
c01bc0cc: ebfffd7d bl c01bb6c8 <tty_ldisc_get>
c01bc0d0: e3700a01 cmn r0, #4096 ; 0x1000
c01bc0d4: e1a06000 mov r6, r0
c01bc0d8: 9a000002 bls c01bc0e8 <tty_set_ldisc+0x300>
c01bc0dc: e59f014c ldr r0, [pc, #332] ; c01bc230 <tty_set_ldisc+0x448>
c01bc0e0: e3a01e1f mov r1, #496 ; 0x1f0
c01bc0e4: ebf9ee80 bl c0037aec <warn_slowpath_null>
c01bc0e8: e1a00004 mov r0, r4
c01bc0ec: e1a01006 mov r1, r6
c01bc0f0: ebfffc98 bl c01bb358 <tty_ldisc_assign>
c01bc0f4: e5963000 ldr r3, [r6]
c01bc0f8: e1a00004 mov r0, r4
c01bc0fc: e5931008 ldr r1, [r3, #8]
c01bc100: ebfffda3 bl c01bb794 <tty_set_termios_ldisc>
c01bc104: e1a00004 mov r0, r4
c01bc108: e1a01006 mov r1, r6
c01bc10c: ebfffdcf bl c01bb850 <tty_ldisc_open>
c01bc110: e3500000 cmp r0, #0
c01bc114: aa00001a bge c01bc184 <tty_set_ldisc+0x39c>
c01bc118: e1a00006 mov r0, r6
c01bc11c: ebfffdf2 bl c01bb8ec <put_ldisc>
c01bc120: e3a00000 mov r0, #0
c01bc124: ebfffd67 bl c01bb6c8 <tty_ldisc_get>
c01bc128: e3700a01 cmn r0, #4096 ; 0x1000
c01bc12c: e1a06000 mov r6, r0
c01bc130: 9a000001 bls c01bc13c <tty_set_ldisc+0x354>
c01bc134: e59f00f8 ldr r0, [pc, #248] ; c01bc234 <tty_set_ldisc+0x44c>
c01bc138: eb06e09c bl c03743b0 <panic>
c01bc13c: e1a01006 mov r1, r6
c01bc140: e1a00004 mov r0, r4
c01bc144: ebfffc83 bl c01bb358 <tty_ldisc_assign>
c01bc148: e1a00004 mov r0, r4
c01bc14c: e3a01000 mov r1, #0
c01bc150: ebfffd8f bl c01bb794 <tty_set_termios_ldisc>
c01bc154: e1a01006 mov r1, r6
c01bc158: e1a00004 mov r0, r4
c01bc15c: ebfffdbb bl c01bb850 <tty_ldisc_open>
c01bc160: e2506000 subs r6, r0, #0
c01bc164: aa000006 bge c01bc184 <tty_set_ldisc+0x39c>
c01bc168: e28d1010 add r1, sp, #16
c01bc16c: e1a00004 mov r0, r4
c01bc16c: e1a00004 mov r0, r4
c01bc170: ebffe9cd bl c01b68ac <tty_name>
c01bc174: e1a02006 mov r2, r6
c01bc178: e1a01000 mov r1, r0
c01bc17c: e59f00b4 ldr r0, [pc, #180] ; c01bc238 <tty_set_ldisc+0x450>
c01bc180: eb06e08a bl c03743b0 <panic>
c01bc184: e5943024 ldr r3, [r4, #36] ; 0x24
c01bc188: e5932000 ldr r2, [r3]
c01bc18c: e59a3000 ldr r3, [sl]
c01bc190: e5922008 ldr r2, [r2, #8]
c01bc194: e5933008 ldr r3, [r3, #8]
c01bc198: e1520003 cmp r2, r3
c01bc19c: 0a000005 beq c01bc1b8 <tty_set_ldisc+0x3d0>
c01bc1a0: e5943010 ldr r3, [r4, #16]
c01bc1a4: e5933058 ldr r3, [r3, #88] ; 0x58
c01bc1a8: e3530000 cmp r3, #0
c01bc1ac: 0a000001 beq c01bc1b8 <tty_set_ldisc+0x3d0>
c01bc1b0: e1a00004 mov r0, r4
c01bc1b4: e12fff33 blx r3
c01bc1b8: e1a0000a mov r0, sl
c01bc1bc: ebfffdca bl c01bb8ec <put_ldisc>
c01bc1c0: e1a00004 mov r0, r4
c01bc1c4: ebfffe31 bl c01bba90 <tty_ldisc_enable>
c01bc1c8: e3580000 cmp r8, #0
c01bc1cc: 0a000001 beq c01bc1d8 <tty_set_ldisc+0x3f0>
c01bc1d0: e1a00008 mov r0, r8
c01bc1d4: ebfffe2d bl c01bba90 <tty_ldisc_enable>
c01bc1d8: e59d300c ldr r3, [sp, #12]
c01bc1dc: e3530000 cmp r3, #0
c01bc1e0: 0a000002 beq c01bc1f0 <tty_set_ldisc+0x408>
c01bc1e4: e28400a8 add r0, r4, #168 ; 0xa8
c01bc1e8: e3a01001 mov r1, #1
c01bc1ec: ebfa3fe5 bl c004c188 <schedule_delayed_work>
c01bc1f0: e59d3008 ldr r3, [sp, #8]
c01bc1f4: e3530000 cmp r3, #0
c01bc1f8: 0a000002 beq c01bc208 <tty_set_ldisc+0x420>
c01bc1fc: e28800a8 add r0, r8, #168 ; 0xa8
c01bc200: e3a01001 mov r1, #1
c01bc204: ebfa3fdf bl c004c188 <schedule_delayed_work>
c01bc208: e1a00007 mov r0, r7
c01bc20c: eb06e4f0 bl c03755d4 <mutex_unlock>
c01bc210: eb06e9ef bl c03769d4 <tty_unlock>
c01bc214: e1a00005 mov r0, r5
c01bc218: e28dd054 add sp, sp, #84 ; 0x54
c01bc21c: e8bd8ff0 pop {r4, r5, r6, r7, r8, r9, sl, fp, pc}
c01bc220: c0050040 .word 0xc0050040
c01bc224: c04a3e08 .word 0xc04a3e08
c01bc228: c04a3e00 .word 0xc04a3e00
c01bc22c: fffffe00 .word 0xfffffe00
c01bc230: c0431d29 .word 0xc0431d29
c01bc234: c0431d41 .word 0xc0431d41
c01bc238: c0431d4c .word 0xc0431d4c
Hope, that helps,
S.
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