Aborted L4linux due to CLI/STI
Masti Ramya Jayaram
rmasti at inf.ethz.ch
Fri Sep 5 18:12:52 CEST 2014
Dear all,
I get an error during L4linux boot when I enter the debugger (using ESC) and resume:
Aborted L4linux due to CLI/STI at 0x534911.
When I disassemble this using gdb:
(gdb) disassemble 0x534911
Dump of assembler code for function cmpxchg8b_emu:
0x00534910 <+0>: pushf
0x00534911 <+1>: cli
0x00534912 <+2>: cmp (%esi),%eax
0x00534914 <+4>: jne 0x534922 <cmpxchg8b_emu+18>
0x00534916 <+6>: cmp 0x4(%esi),%edx
0x00534919 <+9>: jne 0x534924 <half_same>
0x0053491b <+11>: mov %ebx,(%esi)
0x0053491d <+13>: mov %ecx,0x4(%esi)
0x00534920 <+16>: popf
0x00534921 <+17>: ret
0x00534922 <+18>: mov (%esi),%eax
0x00534924 <+0>: mov 0x4(%esi),%edx
0x00534927 <+3>: popf
0x00534928 <+4>: ret
When I built l4linux, I had to disable CONFIG_X86_CMPXCHG, CONFIG_CMPXCHG_LOCAL and CONFIG_X86_CMPXCHG64 despite building for the Pentium because my processor does not support PAE (which is the option that enables this). I am guessing This is the reason it tries to emulate the CMPXCHG instructions.
What is the correct l4linux configuration to use for a machine that does not support any of the atomic instructions like CMPXCHG8, ATOMIC, etc.?
Thanks,
ramya
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