gdb disassembly of segfaulting function

disassembly.gdb.txt (text/plain), 7.34 KB, created by Matthew Ogilvie on 2023-06-04 22:23:39 UTC

(gdb) bt
#0  0x0000000000449068 in alloc_mapping ()
#1  0x00000000004c3388 in low_mem_init ()
#2  0x000000000041d157 in main ()
(gdb) disassemble
Dump of assembler code for function alloc_mapping:
   0x0000000000448f70 <+0>:     push   %r14
   0x0000000000448f72 <+2>:     push   %r13
   0x0000000000448f74 <+4>:     mov    %rsi,%r13
   0x0000000000448f77 <+7>:     push   %r12
   0x0000000000448f79 <+9>:     mov    %edi,%r12d
   0x0000000000448f7c <+12>:    push   %rbp
   0x0000000000448f7d <+13>:    mov    %rdx,%rbp
   0x0000000000448f80 <+16>:    sub    $0x8,%rsp
   0x0000000000448f84 <+20>:    movzbl 0x1afcdd(%rip),%edi        # 0x5f8c68 <debug+1960>
   0x0000000000448f8b <+27>:    test   %dil,%dil
   0x0000000000448f8e <+30>:    je     0x448fbf <alloc_mapping+79>
   0x0000000000448f90 <+32>:    test   %r12d,%r12d
   0x0000000000448f93 <+35>:    movb   $0x0,0x1b1986(%rip)        # 0x5fa920
   0x0000000000448f9a <+42>:    je     0x448fab <alloc_mapping+59>
   0x0000000000448f9c <+44>:    mov    %r12d,%edi
   0x0000000000448f9f <+47>:    call   0x448270
   0x0000000000448fa4 <+52>:    movzbl 0x1afcbd(%rip),%edi        # 0x5f8c68 <debug+1960>
   0x0000000000448fab <+59>:    mov    %rbp,%rcx
   0x0000000000448fae <+62>:    mov    $0x5fa920,%edx
   0x0000000000448fb3 <+67>:    mov    $0x5205d0,%esi
   0x0000000000448fb8 <+72>:    xor    %eax,%eax
   0x0000000000448fba <+74>:    call   0x44e980 <log_printf>
   0x0000000000448fbf <+79>:    test   $0x10000,%r12d
   0x0000000000448fc6 <+86>:    je     0x449030 <alloc_mapping+192>
   0x0000000000448fc8 <+88>:    cmp    $0xffffffffffffffff,%rbp
   0x0000000000448fcc <+92>:    je     0x449167 <alloc_mapping+503>
   0x0000000000448fd2 <+98>:    mov    0x1d22e8(%rip),%edx        # 0x61b2c0
   0x0000000000448fd8 <+104>:   test   %edx,%edx
   0x0000000000448fda <+106>:   jle    0x449080 <alloc_mapping+272>
   0x0000000000448fe0 <+112>:   sub    $0x1,%edx
   0x0000000000448fe3 <+115>:   mov    $0x5fb2c0,%eax
   0x0000000000448fe8 <+120>:   shl    $0x5,%rdx
   0x0000000000448fec <+124>:   add    $0x5fb2e0,%rdx
   0x0000000000448ff3 <+131>:   jmp    0x449001 <alloc_mapping+145>
   0x0000000000448ff5 <+133>:   nopl   (%rax)
   0x0000000000448ff8 <+136>:   add    $0x20,%rax
   0x0000000000448ffc <+140>:   cmp    %rdx,%rax
   0x0000000000448fff <+143>:   je     0x449080 <alloc_mapping+272>
   0x0000000000449001 <+145>:   cmp    (%rax),%rbp
   0x0000000000449004 <+148>:   jne    0x448ff8 <alloc_mapping+136>
   0x0000000000449006 <+150>:   mov    %rbp,%rsi
   0x0000000000449009 <+153>:   mov    $0x520648,%edi
   0x000000000044900e <+158>:   xor    %eax,%eax
   0x0000000000449010 <+160>:   call   0x44eb40 <error>
   0x0000000000449015 <+165>:   mov    $0xffffffffffffffff,%r14
   0x000000000044901c <+172>:   add    $0x8,%rsp
   0x0000000000449020 <+176>:   mov    %r14,%rax
   0x0000000000449023 <+179>:   pop    %rbp
   0x0000000000449024 <+180>:   pop    %r12
   0x0000000000449026 <+182>:   pop    %r13
   0x0000000000449028 <+184>:   pop    %r14
   0x000000000044902a <+186>:   ret
   0x000000000044902b <+187>:   nopl   0x0(%rax,%rax,1)
   0x0000000000449030 <+192>:   mov    %r13,%rsi
   0x0000000000449033 <+195>:   mov    %r12d,%edi
   0x0000000000449036 <+198>:   call   *0x1af144(%rip)        # 0x5f8180 <mappingdriver+32>
   0x000000000044903c <+204>:   mov    $0x3,%ecx
   0x0000000000449041 <+209>:   mov    %r13,%rdx
   0x0000000000449044 <+212>:   mov    %r12d,%edi
   0x0000000000449047 <+215>:   mov    %rax,%rsi
   0x000000000044904a <+218>:   mov    %rax,%r14
   0x000000000044904d <+221>:   call   0x448940 <mprotect_mapping>
   0x0000000000449052 <+226>:   test   $0x200,%r12d
   0x0000000000449059 <+233>:   je     0x44901c <alloc_mapping+172>
   0x000000000044905b <+235>:   cmpb   $0x0,0x1afc06(%rip)        # 0x5f8c68 <debug+1960>
   0x0000000000449062 <+242>:   jne    0x449138 <alloc_mapping+456>
=> 0x0000000000449068 <+248>:   mov    %r14,0xd7829(%rip)        # 0x520898 <lowmem_base>
   0x000000000044906f <+255>:   add    $0x8,%rsp
   0x0000000000449073 <+259>:   mov    %r14,%rax
   0x0000000000449076 <+262>:   pop    %rbp
   0x0000000000449077 <+263>:   pop    %r12
   0x0000000000449079 <+265>:   pop    %r13
   0x000000000044907b <+267>:   pop    %r14
   0x000000000044907d <+269>:   ret
   0x000000000044907e <+270>:   xchg   %ax,%ax
   0x0000000000449080 <+272>:   call   0x423610 <open_kmem>
   0x0000000000449085 <+277>:   xor    %edi,%edi
   0x0000000000449087 <+279>:   mov    %rbp,%r9
   0x000000000044908a <+282>:   mov    $0x41,%ecx
   0x000000000044908f <+287>:   mov    0x15e472(%rip),%r8d        # 0x5a7508 <mem_fd>
   0x0000000000449096 <+294>:   mov    $0x3,%edx
   0x000000000044909b <+299>:   mov    %r13,%rsi
   0x000000000044909e <+302>:   call   0x41ce30 <mmap@plt>
   0x00000000004490a3 <+307>:   mov    %rax,%r14
   0x00000000004490a6 <+310>:   call   0x4236c0 <close_kmem>
   0x00000000004490ab <+315>:   cmp    $0xffffffffffffffff,%r14
   0x00000000004490af <+319>:   je     0x44901c <alloc_mapping+172>
   0x00000000004490b5 <+325>:   movslq 0x1d2204(%rip),%rcx        # 0x61b2c0
   0x00000000004490bc <+332>:   mov    %rcx,%rax
   0x00000000004490bf <+335>:   shl    $0x5,%rcx
   0x00000000004490c3 <+339>:   add    $0x1,%eax
   0x00000000004490c6 <+342>:   cmpb   $0x0,0x1afb9b(%rip)        # 0x5f8c68 <debug+1960>
   0x00000000004490cd <+349>:   mov    %rbp,0x5fb2c0(%rcx)
   0x00000000004490d4 <+356>:   mov    %r14,0x5fb2c8(%rcx)
   0x00000000004490db <+363>:   movq   $0x0,0x5fb2d0(%rcx)
   0x00000000004490e6 <+374>:   mov    %r13d,0x5fb2d8(%rcx)
   0x00000000004490ed <+381>:   movl   $0x0,0x5fb2dc(%rcx)
   0x00000000004490f7 <+391>:   mov    %eax,0x1d21c3(%rip)        # 0x61b2c0
   0x00000000004490fd <+397>:   je     0x44901c <alloc_mapping+172>
   0x0000000000449103 <+403>:   mov    %r12d,%edi
   0x0000000000449106 <+406>:   movb   $0x0,0x1b1813(%rip)        # 0x5fa920
   0x000000000044910d <+413>:   call   0x448270
   0x0000000000449112 <+418>:   mov    %r14,%rcx
   0x0000000000449115 <+421>:   mov    $0x5fa920,%edx
   0x000000000044911a <+426>:   xor    %eax,%eax
--Type <RET> for more, q to quit, c to continue without paging--
   0x000000000044911c <+428>:   movzbl 0x1afb45(%rip),%edi        # 0x5f8c68 <debug+1960>
   0x0000000000449123 <+435>:   mov    $0x5205f8,%esi
   0x0000000000449128 <+440>:   call   0x44e980 <log_printf>
   0x000000000044912d <+445>:   jmp    0x44901c <alloc_mapping+172>
   0x0000000000449132 <+450>:   nopw   0x0(%rax,%rax,1)
   0x0000000000449138 <+456>:   mov    %r12d,%edi
   0x000000000044913b <+459>:   movb   $0x0,0x1b17de(%rip)        # 0x5fa920
   0x0000000000449142 <+466>:   call   0x448270
   0x0000000000449147 <+471>:   mov    %r14,%rcx
   0x000000000044914a <+474>:   mov    $0x5fa920,%edx
   0x000000000044914f <+479>:   xor    %eax,%eax
   0x0000000000449151 <+481>:   movzbl 0x1afb10(%rip),%edi        # 0x5f8c68 <debug+1960>
   0x0000000000449158 <+488>:   mov    $0x520620,%esi
   0x000000000044915d <+493>:   call   0x44e980 <log_printf>
   0x0000000000449162 <+498>:   jmp    0x449068 <alloc_mapping+248>
   0x0000000000449167 <+503>:   mov    $0x52080c,%edi
   0x000000000044916c <+508>:   xor    %eax,%eax
   0x000000000044916e <+510>:   call   0x44eb40 <error>
   0x0000000000449173 <+515>:   mov    $0x187,%edx
   0x0000000000449178 <+520>:   mov    $0x520860,%esi
   0x000000000044917d <+525>:   mov    $0x40,%edi
   0x0000000000449182 <+530>:   call   0x41df40 <__leavedos>
End of assembler dump.
(gdb)