https://sourceware.org/bugzilla/show_bug.cgi?id=16788
Markus Trippelsdorf <markus at trippelsdorf dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |luto at mit dot edu
--- Comment #3 from Markus Trippelsdorf <markus at trippelsdorf dot de> ---
CCing Andy. Maybe he knows what is going on.
The first lines of the disassembly diff look like:
--- good 2014-04-01 16:42:13.680345325 +0200
+++ bad 2014-04-01 16:41:52.877489192 +0200
@@ -107,32 +107,25 @@
ffffffff810001a4 <bad_address>:
ffffffff810001a4: eb fe jmp ffffffff810001a4
<bad_address>
-ffffffff810001a6: 90 nop
-ffffffff810001a7: 90 nop
+ ...
ffffffff810001a8 <_stext>:
-ffffffff810001a8: 90 nop
-ffffffff810001a9: 90 nop
+ffffffff810001a8: 00 00 add %al,(%rax)
ffffffff810001aa: 90 nop
ffffffff810001ab: 90 nop
-ffffffff810001ac: 90 nop
-ffffffff810001ad: 90 nop
+ffffffff810001ac: 00 00 add %al,(%rax)
ffffffff810001ae: 90 nop
ffffffff810001af: 90 nop
-ffffffff810001b0: 90 nop
-ffffffff810001b1: 90 nop
+ffffffff810001b0: 00 00 add %al,(%rax)
ffffffff810001b2: 90 nop
ffffffff810001b3: 90 nop
-ffffffff810001b4: 90 nop
-ffffffff810001b5: 90 nop
+ffffffff810001b4: 00 00 add %al,(%rax)
ffffffff810001b6: 90 nop
ffffffff810001b7: 90 nop
-ffffffff810001b8: 90 nop
-ffffffff810001b9: 90 nop
+ffffffff810001b8: 00 00 add %al,(%rax)
ffffffff810001ba: 90 nop
ffffffff810001bb: 90 nop
-ffffffff810001bc: 90 nop
-ffffffff810001bd: 90 nop
+ffffffff810001bc: 00 00 add %al,(%rax)
ffffffff810001be: 90 nop
ffffffff810001bf: 90 nop
@@ -165,7 +158,7 @@
ffffffff81000218: c3 retq
ffffffff81000219: 89 da mov %ebx,%edx
ffffffff8100021b: 48 89 ee mov %rbp,%rsi
-ffffffff8100021e: 48 c7 c7 10 e7 75 81 mov $0xffffffff8175e710,%rdi
+ffffffff8100021e: 48 c7 c7 c8 cf 78 81 mov $0xffffffff8178cfc8,%rdi
ffffffff81000225: 31 c0 xor %eax,%eax
ffffffff81000227: e8 75 b2 55 00 callq ffffffff8155b4a1
<printk>
ffffffff8100022c: eb e6 jmp ffffffff81000214
<try_to_run_init_process+0x14>
@@ -226,19 +219,19 @@
ffffffff810002c3: b9 09 00 00 00 mov $0x9,%ecx
ffffffff810002c8: 53 push %rbx
ffffffff810002c9: 48 89 fb mov %rdi,%rbx
-ffffffff810002cc: 48 c7 c7 3a e6 75 81 mov $0xffffffff8175e63a,%rdi
+ffffffff810002cc: 48 c7 c7 6c e6 75 81 mov $0xffffffff8175e66c,%rdi
ffffffff810002d3: 48 89 de mov %rbx,%rsi
ffffffff810002d6: 48 83 ec 30 sub $0x30,%rsp
ffffffff810002da: f3 a6 repz cmpsb
%es:(%rdi),%ds:(%rsi)
ffffffff810002dc: 0f 84 86 00 00 00 je ffffffff81000368
<name_to_dev_t+0xa8>
ffffffff810002e2: b9 05 00 00 00 mov $0x5,%ecx
-ffffffff810002e7: 48 c7 c7 53 e6 75 81 mov $0xffffffff8175e653,%rdi
+ffffffff810002e7: 48 c7 c7 85 e6 75 81 mov $0xffffffff8175e685,%rdi
ffffffff810002ee: 48 89 de mov %rbx,%rsi
ffffffff810002f1: f3 a6 repz cmpsb
%es:(%rdi),%ds:(%rsi)
ffffffff810002f3: 0f 85 ff 00 00 00 jne ffffffff810003f8
<name_to_dev_t+0x138>
ffffffff810002f9: 48 8d 6b 05 lea 0x5(%rbx),%rbp
ffffffff810002fd: b9 04 00 00 00 mov $0x4,%ecx
-ffffffff81000302: 48 c7 c7 88 1d 77 81 mov $0xffffffff81771d88,%rdi
+ffffffff81000302: 48 c7 c7 91 e6 75 81 mov $0xffffffff8175e691,%rdi
ffffffff81000309: 48 89 ee mov %rbp,%rsi
ffffffff8100030c: b8 ff 00 00 00 mov $0xff,%eax
ffffffff81000311: f3 a6 repz cmpsb
%es:(%rdi),%ds:(%rsi)
@@ -253,7 +246,7 @@
ffffffff81000325: c3 retq
ffffffff81000326: 66 90 xchg %ax,%ax
ffffffff81000328: b9 04 00 00 00 mov $0x4,%ecx
-ffffffff8100032d: 48 c7 c7 0a 20 7b 81 mov $0xffffffff817b200a,%rdi
+ffffffff8100032d: 48 c7 c7 95 e6 75 81 mov $0xffffffff8175e695,%rdi
ffffffff81000334: 48 89 ee mov %rbp,%rsi
ffffffff81000337: f3 a6 repz cmpsb
%es:(%rdi),%ds:(%rsi)
ffffffff81000339: b8 00 00 10 00 mov $0x100000,%eax
@@ -286,13 +279,13 @@
ffffffff81000396: 48 8d 4c 24 04 lea 0x4(%rsp),%rcx
ffffffff8100039b: 31 c0 xor %eax,%eax
ffffffff8100039d: 48 8d 54 24 08 lea 0x8(%rsp),%rdx
-ffffffff810003a2: 48 c7 c6 44 e6 75 81 mov $0xffffffff8175e644,%rsi
+ffffffff810003a2: 48 c7 c6 76 e6 75 81 mov $0xffffffff8175e676,%rsi
ffffffff810003a9: c6 44 24 04 00 movb $0x0,0x4(%rsp)
ffffffff810003ae: e8 ed 17 1f 00 callq ffffffff811f1ba0
<sscanf>
ffffffff810003b3: ff c8 dec %eax
ffffffff810003b5: 0f 84 dd 00 00 00 je ffffffff81000498
<name_to_dev_t+0x1d8>
ffffffff810003bb: 31 c0 xor %eax,%eax
-ffffffff810003bd: 48 c7 c7 58 e9 75 81 mov $0xffffffff8175e958,%rdi
+ffffffff810003bd: 48 c7 c7 10 d2 78 81 mov $0xffffffff8178d210,%rdi
ffffffff810003c4: e8 d8 b0 55 00 callq ffffffff8155b4a1
<printk>
ffffffff810003c9: 8b 05 85 9c 92 00 mov 0x929c85(%rip),%eax
# ffffffff8192a054 <root_wait>
ffffffff810003cf: 85 c0 test %eax,%eax
@@ -311,7 +304,7 @@
ffffffff810003f8: 31 c0 xor %eax,%eax
ffffffff810003fa: 48 8d 4c 24 10 lea 0x10(%rsp),%rcx
ffffffff810003ff: 48 8d 54 24 04 lea 0x4(%rsp),%rdx
-ffffffff81000404: 48 c7 c6 a2 e3 7a 81 mov $0xffffffff817ae3a2,%rsi
+ffffffff81000404: 48 c7 c6 8b e6 75 81 mov $0xffffffff8175e68b,%rsi
ffffffff8100040b: 48 89 df mov %rbx,%rdi
ffffffff8100040e: e8 8d 17 1f 00 callq ffffffff811f1ba0
<sscanf>
ffffffff81000413: 83 f8 02 cmp $0x2,%eax
@@ -505,7 +498,7 @@
ffffffff810006d4: 0f b7 54 05 fe movzwl -0x2(%rbp,%rax,1),%edx
ffffffff810006d9: 66 41 89 54 04 fe mov %dx,-0x2(%r12,%rax,1)
ffffffff810006df: e9 89 fe ff ff jmpq ffffffff8100056d
<name_to_dev_t+0x2ad>
-ffffffff810006e4: 48 c7 c7 28 e9 75 81 mov $0xffffffff8175e928,%rdi
+ffffffff810006e4: 48 c7 c7 e0 d1 78 81 mov $0xffffffff8178d1e0,%rdi
ffffffff810006eb: 31 c0 xor %eax,%eax
ffffffff810006ed: e8 af ad 55 00 callq ffffffff8155b4a1
<printk>
ffffffff810006f2: e9 e0 fc ff ff jmpq ffffffff810003d7
<name_to_dev_t+0x117>
@@ -556,7 +549,7 @@
ffffffff8100079a: 74 2c je ffffffff810007c8
<calibrate_delay+0xa8>
ffffffff8100079c: 80 3d c5 98 92 00 00 cmpb $0x0,0x9298c5(%rip)
# ffffffff8192a068 <printed.10205>
ffffffff810007a3: 75 bc jne ffffffff81000761
<calibrate_delay+0x41>
-ffffffff810007a5: 48 c7 c7 60 eb 75 81 mov $0xffffffff8175eb60,%rdi
+ffffffff810007a5: 48 c7 c7 18 d4 78 81 mov $0xffffffff8178d418,%rdi
ffffffff810007ac: 31 c0 xor %eax,%eax
ffffffff810007ae: e8 ee ac 55 00 callq ffffffff8155b4a1
<printk>
ffffffff810007b3: 4a 8b 14 e5 c0 50 86 mov
-0x7e79af40(,%r12,8),%rdx
@@ -602,7 +595,7 @@
ffffffff8100085b: 31 c0 xor %eax,%eax
ffffffff8100085d: 48 89 d6 mov %rdx,%rsi
ffffffff81000860: 48 89 fa mov %rdi,%rdx
-ffffffff81000863: 48 c7 c7 cd e6 75 81 mov $0xffffffff8175e6cd,%rdi
+ffffffff81000863: 48 c7 c7 2f e7 75 81 mov $0xffffffff8175e72f,%rdi
ffffffff8100086a: 48 c1 ee 09 shr $0x9,%rsi
ffffffff8100086e: e8 2e ac 55 00 callq ffffffff8155b4a1
<printk>
ffffffff81000873: e9 f4 fe ff ff jmpq ffffffff8100076c
<calibrate_delay+0x4c>
@@ -623,8 +616,8 @@
ffffffff810008b6: 00 00
ffffffff810008b8: 45 89 ee mov %r13d,%r14d
ffffffff810008bb: e8 e0 16 1f 00 callq ffffffff811f1fa0
<read_current_timer>
-ffffffff810008c0: 4c 8b 25 39 f7 86 00 mov 0x86f739(%rip),%r12
# ffffffff81870000 <__vvar_beginning_hack>
-ffffffff810008c7: 48 8b 05 32 f7 86 00 mov 0x86f732(%rip),%rax
# ffffffff81870000 <__vvar_beginning_hack>
+ffffffff810008c0: 4c 8b 25 39 f7 86 00 mov 0x86f739(%rip),%r12
# ffffffff81870000 <__init_begin>
+ffffffff810008c7: 48 8b 05 32 f7 86 00 mov 0x86f732(%rip),%rax
# ffffffff81870000 <__init_begin>
ffffffff810008ce: 4d 8d 7c 24 01 lea 0x1(%r12),%r15
ffffffff810008d3: 49 39 c7 cmp %rax,%r15
ffffffff810008d6: 78 28 js ffffffff81000900
<calibrate_delay+0x1e0>
--
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