Aborted L4linux due to CLI/STI
Masti Ramya Jayaram
rmasti at inf.ethz.ch
Fri Sep 5 18:21:34 CEST 2014
I forgot to mention that it also does not support the traditional cmpxchg instructions using the lock line. That is why I disabled it.
Sorry about the multiple emails,
Sent from my phone
> On 05 Sep 2014, at 18:16, "Masti Ramya Jayaram" <rmasti at inf.ethz.ch> wrote:
> 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.?
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