[syslinux] Crash with core32 (syslinux-3.81-pre12-68-g4a211f6)

[Sebastian Herbszt]

I got a qemu crash and errors reported in bochs while trying to get latest core32
branch working (pxelinux):

qemu: fatal: Trying to execute code outside RAM or ROM at 0xe6e8aa07

EAX=6e0c7811 EBX=000034b3 ECX=ca68b338 EDX=00000048
ESI=750e3fff EDI=00000020 EBP=d07e4988 ESP=00102324
EIP=e6e8aa07 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0028 00000000 ffffffff 00cf9300
CS =0020 00000000 ffffffff 00cf9b00
SS =0028 00000000 ffffffff 00cf9300
DS =0028 00000000 ffffffff 00cf9300
FS =0000 00000000 00000000 00000000
GS =0000 00000000 00000000 00000000
LDT=0000 00000000 00000000 00008200
TR =0008 00000580 00000067 00008900
GDT=     0000b050 0000002f
IDT=     00002800 000007ff
CR0=60000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000
DR6=ffff0ff0 DR7=00000400
CCS=00000044 CCD=00000000 CCO=EFLAGS
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
XMM00=00000000000000000000000000000000 XMM01=00000000000000000000000000000000
XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000
XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000
XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000

bochsout.txt:

00540593725e[CPU0 ] write_virtual_checks(): no write access to seg
00540593814e[CPU0 ] fetch_raw_descriptor: GDT: index (3a27)744 > limit (2f)
00540593903e[CPU0 ] fetch_raw_descriptor: LDTR.valid=0
...
00540644544e[CPU0 ] fetch_raw_descriptor: LDTR.valid=0
00540644633e[CPU0 ] fetch_raw_descriptor: GDT: index (3137)626 > limit (2f)
00540644666e[CPU0 ] prefetch: EIP [00010000] > CS.limit [0000ffff]

- Sebastian