Hello, Lev.
You wrote 23 февраля 2013 г., 0:14:45:
LS> Hello, Dimitry.
LS> You wrote 22 февраля 2013 г., 20:14:50:
DA>> As Joerg Sonnenberger mentioned to me, the address 0x10351d6 you show in
DA>> the gdb session seems to be quite high, possibly pointing to some shared
DA>> library. Maybe you can try to figure out which library it is?
LS> Here is two long NOPs in output of clang in -CURRENT without "-march"
LS> options:
LS> objdump -d test
LS> 080483a0 <_start1>:
LS> ...
LS> 80483e8: 40 inc %eax
LS> 80483e9: 0f 1f 80 00 00 00 00 nopl 0x0(%eax)
LS> 80483f0: 8a 08 mov (%eax),%cl
LS> ...
LS> 8048496: 31 ff xor %edi,%edi
LS> 8048498: 0f 1f 84 00 00 00 00 nopl 0x0(%eax,%eax,1)
LS> 804849f: 00
LS> 80484a0: 8b 04 bd 68 96 04 08 mov 0x8049668(,%edi,4),%eax
And sample code is EXACTLY THE SAME with "-march=geode" and crashes the
same!
I'm puzzled, why system binaries works in such case!?
But disassembly of system binaries (for example, /usr/bin/who)
doesn't contains "nopl" at all!
I've attached disassembly of "start1" form:
(a) unstripped "who" command built in "make buildworld" stage with
CPUTYPE=geode set.
(b) unstripped "Hello world" program, built with simple "cc -o test \
test.c" (contains "nopl")
(c) unstripped "Hello world" program, built with simple "cc \
-march=geode -o test.geode test.c" (contains "nopl" too!)
Oh, I see... "start1" is linked from startup code like crt0.o, am I
right?
So, rebuilding only ports with "CPUTYPE=geode" will not help!
But, in any case, it seems to be bug in clang to generate such
instructions in "default" case.
--
// Black Lion AKA Lev Serebryakov <l...@freebsd.org>080483a0 <_start1>:
80483a0: 55 push %ebp
80483a1: 89 e5 mov %esp,%ebp
80483a3: 53 push %ebx
80483a4: 57 push %edi
80483a5: 56 push %esi
80483a6: 83 ec 10 sub $0x10,%esp
80483a9: 8b 45 0c mov 0xc(%ebp),%eax
80483ac: 8b 5d 10 mov 0x10(%ebp),%ebx
80483af: 8d 44 83 04 lea 0x4(%ebx,%eax,4),%eax
80483b3: 81 3d 60 97 04 08 00 cmpl $0x0,0x8049760
80483ba: 00 00 00
80483bd: 75 05 jne 80483c4 <_start1+0x24>
80483bf: a3 60 97 04 08 mov %eax,0x8049760
80483c4: 89 45 f0 mov %eax,-0x10(%ebp)
80483c7: 83 7d 0c 00 cmpl $0x0,0xc(%ebp)
80483cb: 7e 2e jle 80483fb <_start1+0x5b>
80483cd: 8b 03 mov (%ebx),%eax
80483cf: 85 c0 test %eax,%eax
80483d1: 74 28 je 80483fb <_start1+0x5b>
80483d3: eb 0c jmp 80483e1 <_start1+0x41>
80483d5: 66 66 2e 0f 1f 84 00 nopw %cs:0x0(%eax,%eax,1)
80483dc: 00 00 00 00
80483e0: 40 inc %eax
80483e1: a3 50 97 04 08 mov %eax,0x8049750
80483e6: eb 08 jmp 80483f0 <_start1+0x50>
80483e8: 40 inc %eax
80483e9: 0f 1f 80 00 00 00 00 nopl 0x0(%eax)
80483f0: 8a 08 mov (%eax),%cl
80483f2: 80 f9 2f cmp $0x2f,%cl
80483f5: 74 e9 je 80483e0 <_start1+0x40>
80483f7: 84 c9 test %cl,%cl
80483f9: 75 ed jne 80483e8 <_start1+0x48>
80483fb: b8 7c 96 04 08 mov $0x804967c,%eax
8048400: 85 c0 test %eax,%eax
8048402: 74 0d je 8048411 <_start1+0x71>
8048404: 8b 45 08 mov 0x8(%ebp),%eax
8048407: 89 04 24 mov %eax,(%esp)
804840a: e8 41 ff ff ff call 8048350 <atexit@plt>
804840f: eb 05 jmp 8048416 <_start1+0x76>
8048411: e8 4a ff ff ff call 8048360 <_init_tls@plt>
8048416: b8 7c 96 04 08 mov $0x804967c,%eax
804841b: 85 c0 test %eax,%eax
804841d: 0f 85 a1 00 00 00 jne 80484c4 <_start1+0x124>
8048423: c7 04 24 f0 84 04 08 movl $0x80484f0,(%esp)
804842a: b9 68 96 04 08 mov $0x8049668,%ecx
804842f: b8 68 96 04 08 mov $0x8049668,%eax
8048434: 29 c8 sub %ecx,%eax
8048436: 89 c6 mov %eax,%esi
8048438: c1 fe 1f sar $0x1f,%esi
804843b: c1 ee 1e shr $0x1e,%esi
804843e: 01 c6 add %eax,%esi
8048440: c1 fe 02 sar $0x2,%esi
8048443: e8 08 ff ff ff call 8048350 <atexit@plt>
8048448: 85 f6 test %esi,%esi
804844a: 74 28 je 8048474 <_start1+0xd4>
804844c: 31 ff xor %edi,%edi
804844e: 66 90 xchg %ax,%ax
8048450: 8b 04 bd 68 96 04 08 mov 0x8049668(,%edi,4),%eax
8048457: 83 f8 02 cmp $0x2,%eax
804845a: 72 13 jb 804846f <_start1+0xcf>
804845c: 8b 4d f0 mov -0x10(%ebp),%ecx
804845f: 89 4c 24 08 mov %ecx,0x8(%esp)
8048463: 89 5c 24 04 mov %ebx,0x4(%esp)
8048467: 8b 4d 0c mov 0xc(%ebp),%ecx
804846a: 89 0c 24 mov %ecx,(%esp)
804846d: ff d0 call *%eax
804846f: 47 inc %edi
8048470: 39 f7 cmp %esi,%edi
8048472: 72 dc jb 8048450 <_start1+0xb0>
8048474: b9 68 96 04 08 mov $0x8049668,%ecx
8048479: b8 68 96 04 08 mov $0x8049668,%eax
804847e: 29 c8 sub %ecx,%eax
8048480: 89 c6 mov %eax,%esi
8048482: c1 fe 1f sar $0x1f,%esi
8048485: c1 ee 1e shr $0x1e,%esi
8048488: 01 c6 add %eax,%esi
804848a: c1 fe 02 sar $0x2,%esi
804848d: e8 8a fe ff ff call 804831c <_init>
8048492: 85 f6 test %esi,%esi
8048494: 74 2e je 80484c4 <_start1+0x124>
8048496: 31 ff xor %edi,%edi
8048498: 0f 1f 84 00 00 00 00 nopl 0x0(%eax,%eax,1)
804849f: 00
80484a0: 8b 04 bd 68 96 04 08 mov 0x8049668(,%edi,4),%eax
80484a7: 83 f8 02 cmp $0x2,%eax
80484aa: 72 13 jb 80484bf <_start1+0x11f>
80484ac: 8b 4d f0 mov -0x10(%ebp),%ecx
80484af: 89 4c 24 08 mov %ecx,0x8(%esp)
80484b3: 89 5c 24 04 mov %ebx,0x4(%esp)
80484b7: 8b 4d 0c mov 0xc(%ebp),%ecx
80484ba: 89 0c 24 mov %ecx,(%esp)
80484bd: ff d0 call *%eax
80484bf: 47 inc %edi
80484c0: 39 f7 cmp %esi,%edi
80484c2: 72 dc jb 80484a0 <_start1+0x100>
80484c4: 8b 45 f0 mov -0x10(%ebp),%eax
80484c7: 89 44 24 08 mov %eax,0x8(%esp)
80484cb: 89 5c 24 04 mov %ebx,0x4(%esp)
80484cf: 8b 45 0c mov 0xc(%ebp),%eax
80484d2: 89 04 24 mov %eax,(%esp)
80484d5: e8 b6 00 00 00 call 8048590 <main>
80484da: 89 04 24 mov %eax,(%esp)
80484dd: e8 8e fe ff ff call 8048370 <exit@plt>
80484e2: 66 66 66 66 66 2e 0f nopw %cs:0x0(%eax,%eax,1)
80484e9: 1f 84 00 00 00 00 00
080483a0 <_start1>:
80483a0: 55 push %ebp
80483a1: 89 e5 mov %esp,%ebp
80483a3: 53 push %ebx
80483a4: 57 push %edi
80483a5: 56 push %esi
80483a6: 83 ec 10 sub $0x10,%esp
80483a9: 8b 45 0c mov 0xc(%ebp),%eax
80483ac: 8b 5d 10 mov 0x10(%ebp),%ebx
80483af: 8d 44 83 04 lea 0x4(%ebx,%eax,4),%eax
80483b3: 81 3d 60 97 04 08 00 cmpl $0x0,0x8049760
80483ba: 00 00 00
80483bd: 75 05 jne 80483c4 <_start1+0x24>
80483bf: a3 60 97 04 08 mov %eax,0x8049760
80483c4: 89 45 f0 mov %eax,-0x10(%ebp)
80483c7: 83 7d 0c 00 cmpl $0x0,0xc(%ebp)
80483cb: 7e 2e jle 80483fb <_start1+0x5b>
80483cd: 8b 03 mov (%ebx),%eax
80483cf: 85 c0 test %eax,%eax
80483d1: 74 28 je 80483fb <_start1+0x5b>
80483d3: eb 0c jmp 80483e1 <_start1+0x41>
80483d5: 66 66 2e 0f 1f 84 00 nopw %cs:0x0(%eax,%eax,1)
80483dc: 00 00 00 00
80483e0: 40 inc %eax
80483e1: a3 50 97 04 08 mov %eax,0x8049750
80483e6: eb 08 jmp 80483f0 <_start1+0x50>
80483e8: 40 inc %eax
80483e9: 0f 1f 80 00 00 00 00 nopl 0x0(%eax)
80483f0: 8a 08 mov (%eax),%cl
80483f2: 80 f9 2f cmp $0x2f,%cl
80483f5: 74 e9 je 80483e0 <_start1+0x40>
80483f7: 84 c9 test %cl,%cl
80483f9: 75 ed jne 80483e8 <_start1+0x48>
80483fb: b8 7c 96 04 08 mov $0x804967c,%eax
8048400: 85 c0 test %eax,%eax
8048402: 74 0d je 8048411 <_start1+0x71>
8048404: 8b 45 08 mov 0x8(%ebp),%eax
8048407: 89 04 24 mov %eax,(%esp)
804840a: e8 41 ff ff ff call 8048350 <atexit@plt>
804840f: eb 05 jmp 8048416 <_start1+0x76>
8048411: e8 4a ff ff ff call 8048360 <_init_tls@plt>
8048416: b8 7c 96 04 08 mov $0x804967c,%eax
804841b: 85 c0 test %eax,%eax
804841d: 0f 85 a1 00 00 00 jne 80484c4 <_start1+0x124>
8048423: c7 04 24 f0 84 04 08 movl $0x80484f0,(%esp)
804842a: b9 68 96 04 08 mov $0x8049668,%ecx
804842f: b8 68 96 04 08 mov $0x8049668,%eax
8048434: 29 c8 sub %ecx,%eax
8048436: 89 c6 mov %eax,%esi
8048438: c1 fe 1f sar $0x1f,%esi
804843b: c1 ee 1e shr $0x1e,%esi
804843e: 01 c6 add %eax,%esi
8048440: c1 fe 02 sar $0x2,%esi
8048443: e8 08 ff ff ff call 8048350 <atexit@plt>
8048448: 85 f6 test %esi,%esi
804844a: 74 28 je 8048474 <_start1+0xd4>
804844c: 31 ff xor %edi,%edi
804844e: 66 90 xchg %ax,%ax
8048450: 8b 04 bd 68 96 04 08 mov 0x8049668(,%edi,4),%eax
8048457: 83 f8 02 cmp $0x2,%eax
804845a: 72 13 jb 804846f <_start1+0xcf>
804845c: 8b 4d f0 mov -0x10(%ebp),%ecx
804845f: 89 4c 24 08 mov %ecx,0x8(%esp)
8048463: 89 5c 24 04 mov %ebx,0x4(%esp)
8048467: 8b 4d 0c mov 0xc(%ebp),%ecx
804846a: 89 0c 24 mov %ecx,(%esp)
804846d: ff d0 call *%eax
804846f: 47 inc %edi
8048470: 39 f7 cmp %esi,%edi
8048472: 72 dc jb 8048450 <_start1+0xb0>
8048474: b9 68 96 04 08 mov $0x8049668,%ecx
8048479: b8 68 96 04 08 mov $0x8049668,%eax
804847e: 29 c8 sub %ecx,%eax
8048480: 89 c6 mov %eax,%esi
8048482: c1 fe 1f sar $0x1f,%esi
8048485: c1 ee 1e shr $0x1e,%esi
8048488: 01 c6 add %eax,%esi
804848a: c1 fe 02 sar $0x2,%esi
804848d: e8 8a fe ff ff call 804831c <_init>
8048492: 85 f6 test %esi,%esi
8048494: 74 2e je 80484c4 <_start1+0x124>
8048496: 31 ff xor %edi,%edi
8048498: 0f 1f 84 00 00 00 00 nopl 0x0(%eax,%eax,1)
804849f: 00
80484a0: 8b 04 bd 68 96 04 08 mov 0x8049668(,%edi,4),%eax
80484a7: 83 f8 02 cmp $0x2,%eax
80484aa: 72 13 jb 80484bf <_start1+0x11f>
80484ac: 8b 4d f0 mov -0x10(%ebp),%ecx
80484af: 89 4c 24 08 mov %ecx,0x8(%esp)
80484b3: 89 5c 24 04 mov %ebx,0x4(%esp)
80484b7: 8b 4d 0c mov 0xc(%ebp),%ecx
80484ba: 89 0c 24 mov %ecx,(%esp)
80484bd: ff d0 call *%eax
80484bf: 47 inc %edi
80484c0: 39 f7 cmp %esi,%edi
80484c2: 72 dc jb 80484a0 <_start1+0x100>
80484c4: 8b 45 f0 mov -0x10(%ebp),%eax
80484c7: 89 44 24 08 mov %eax,0x8(%esp)
80484cb: 89 5c 24 04 mov %ebx,0x4(%esp)
80484cf: 8b 45 0c mov 0xc(%ebp),%eax
80484d2: 89 04 24 mov %eax,(%esp)
80484d5: e8 b6 00 00 00 call 8048590 <main>
80484da: 89 04 24 mov %eax,(%esp)
80484dd: e8 8e fe ff ff call 8048370 <exit@plt>
80484e2: 66 66 66 66 66 2e 0f nopw %cs:0x0(%eax,%eax,1)
80484e9: 1f 84 00 00 00 00 00
08048b0c <_start1>:
8048b0c: 55 push %ebp
8048b0d: 89 e5 mov %esp,%ebp
8048b0f: 57 push %edi
8048b10: 56 push %esi
8048b11: 53 push %ebx
8048b12: 83 ec 1c sub $0x1c,%esp
8048b15: a1 08 aa 04 08 mov 0x804aa08,%eax
8048b1a: 8b 75 0c mov 0xc(%ebp),%esi
8048b1d: 8b 7d 10 mov 0x10(%ebp),%edi
8048b20: 85 c0 test %eax,%eax
8048b22: 8d 5c b7 04 lea 0x4(%edi,%esi,4),%ebx
8048b26: a1 08 aa 04 08 mov 0x804aa08,%eax
8048b2b: 0f 44 c3 cmove %ebx,%eax
8048b2e: 85 f6 test %esi,%esi
8048b30: a3 08 aa 04 08 mov %eax,0x804aa08
8048b35: 7e 2b jle 8048b62 <_start1+0x56>
8048b37: 8b 17 mov (%edi),%edx
8048b39: 85 d2 test %edx,%edx
8048b3b: 74 25 je 8048b62 <_start1+0x56>
8048b3d: 89 15 84 a9 04 08 mov %edx,0x804a984
8048b43: 0f b6 02 movzbl (%edx),%eax
8048b46: 84 c0 test %al,%al
8048b48: 74 18 je 8048b62 <_start1+0x56>
8048b4a: 42 inc %edx
8048b4b: 3c 2f cmp $0x2f,%al
8048b4d: a1 84 a9 04 08 mov 0x804a984,%eax
8048b52: 0f 44 c2 cmove %edx,%eax
8048b55: a3 84 a9 04 08 mov %eax,0x804a984
8048b5a: 0f b6 02 movzbl (%edx),%eax
8048b5d: 42 inc %edx
8048b5e: 84 c0 test %al,%al
8048b60: 75 e9 jne 8048b4b <_start1+0x3f>
8048b62: b8 28 a8 04 08 mov $0x804a828,%eax
8048b67: 85 c0 test %eax,%eax
8048b69: 74 1f je 8048b8a <_start1+0x7e>
8048b6b: 83 ec 0c sub $0xc,%esp
8048b6e: ff 75 08 pushl 0x8(%ebp)
8048b71: e8 0a fe ff ff call 8048980 <atexit@plt>
8048b76: 83 c4 10 add $0x10,%esp
8048b79: 50 push %eax
8048b7a: 53 push %ebx
8048b7b: 57 push %edi
8048b7c: 56 push %esi
8048b7d: e8 2f 04 00 00 call 8048fb1 <main>
8048b82: 89 04 24 mov %eax,(%esp)
8048b85: e8 46 ff ff ff call 8048ad0 <exit@plt>
8048b8a: e8 41 fe ff ff call 80489d0 <_init_tls@plt>
8048b8f: 83 ec 0c sub $0xc,%esp
8048b92: 68 28 8c 04 08 push $0x8048c28
8048b97: e8 e4 fd ff ff call 8048980 <atexit@plt>
8048b9c: b8 14 a8 04 08 mov $0x804a814,%eax
8048ba1: 2d 14 a8 04 08 sub $0x804a814,%eax
8048ba6: 83 c4 10 add $0x10,%esp
8048ba9: c1 f8 02 sar $0x2,%eax
8048bac: 89 45 e8 mov %eax,-0x18(%ebp)
8048baf: 74 2e je 8048bdf <_start1+0xd3>
8048bb1: c7 45 ec 28 a8 04 08 movl $0x804a828,-0x14(%ebp)
8048bb8: eb 0b jmp 8048bc5 <_start1+0xb9>
8048bba: ff 45 ec incl -0x14(%ebp)
8048bbd: 8b 45 ec mov -0x14(%ebp),%eax
8048bc0: 39 45 e8 cmp %eax,-0x18(%ebp)
8048bc3: 74 1a je 8048bdf <_start1+0xd3>
8048bc5: 8b 55 ec mov -0x14(%ebp),%edx
8048bc8: 8b 04 95 14 a8 04 08 mov 0x804a814(,%edx,4),%eax
8048bcf: 83 f8 01 cmp $0x1,%eax
8048bd2: 76 e6 jbe 8048bba <_start1+0xae>
8048bd4: 51 push %ecx
8048bd5: 53 push %ebx
8048bd6: 57 push %edi
8048bd7: 56 push %esi
8048bd8: ff d0 call *%eax
8048bda: 83 c4 10 add $0x10,%esp
8048bdd: eb db jmp 8048bba <_start1+0xae>
8048bdf: e8 e8 fc ff ff call 80488cc <_init>
8048be4: b8 14 a8 04 08 mov $0x804a814,%eax
8048be9: 2d 14 a8 04 08 sub $0x804a814,%eax
8048bee: c1 f8 02 sar $0x2,%eax
8048bf1: 89 45 e4 mov %eax,-0x1c(%ebp)
8048bf4: 74 83 je 8048b79 <_start1+0x6d>
8048bf6: c7 45 f0 00 00 00 00 movl $0x0,-0x10(%ebp)
8048bfd: eb 0f jmp 8048c0e <_start1+0x102>
8048bff: ff 45 f0 incl -0x10(%ebp)
8048c02: 8b 45 f0 mov -0x10(%ebp),%eax
8048c05: 39 45 e4 cmp %eax,-0x1c(%ebp)
8048c08: 0f 84 6b ff ff ff je 8048b79 <_start1+0x6d>
8048c0e: 8b 55 f0 mov -0x10(%ebp),%edx
8048c11: 8b 04 95 14 a8 04 08 mov 0x804a814(,%edx,4),%eax
8048c18: 83 f8 01 cmp $0x1,%eax
8048c1b: 76 e2 jbe 8048bff <_start1+0xf3>
8048c1d: 52 push %edx
8048c1e: 53 push %ebx
8048c1f: 57 push %edi
8048c20: 56 push %esi
8048c21: ff d0 call *%eax
8048c23: 83 c4 10 add $0x10,%esp
8048c26: eb d7 jmp 8048bff <_start1+0xf3>
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
