Something strange going on here...
Why the hell is PF dropping? Same in Qemu with the GDB stub:<bochs:20> r eax: 0x00000003 3 ecx: 0x00094144 606532 edx: 0x000f03fb 984059 ebx: 0xe0004144 -536854204 esp: 0x0009fffc 655356 ebp: 0x00000f9a 3994 esi: 0x0009f400 652288 edi: 0x00200200 2097664 eip: 0x0020028e eflags 0x00000046: id vip vif ac vm rf nt IOPL=0 of df if tf sf ZF af PF cf <bochs:21> s Next at t=123858401 (0) [0x0000000000200291] 0008:00200291 (unk. ctxt): out dx, al ; ee <bochs:22> r eax: 0x00000003 3 ecx: 0x00094144 606532 edx: 0x000f03f8 984056 ebx: 0xe0004144 -536854204 esp: 0x0009fffc 655356 ebp: 0x00000f9a 3994 esi: 0x0009f400 652288 edi: 0x00200200 2097664 eip: 0x00200291 eflags 0x00000082: id vip vif ac vm rf nt IOPL=0 of df if tf SF zf af pf cf <bochs:23>
Real hardware is crashing too, but not sure if it's due to this or not. Note that it doesn't crash right here; it crashes later, when I'm trying to jump back into 16-bit protected mode with a far ret. Then it triple-faults.(gdb) si 0x0020028e in ?? () => 0x0020028e: 80 ea 03 sub $0x3,%dl 12: /x $eax = 0x3 11: /x $ebx = 0xfe004144 10: /x $ecx = 0x4144 9: /x $edx = 0x3fb 8: /x $esi = 0x9f400 7: /x $edi = 0x200200 6: /x $ebp = 0xf9a 5: /x $esp = 0x9fffc 4: /x $es = 0x10 3: /x $ds = 0x10 2: /x $cs = 0x8 1: /x $ss = 0x10 (gdb) info reg eax 0x3 3 ecx 0x4144 16708 edx 0x3fb 1019 ebx 0xfe004144 -33537724 esp 0x9fffc 0x9fffc ebp 0xf9a 0xf9a esi 0x9f400 652288 edi 0x200200 2097664 eip 0x20028e 0x20028e eflags 0x46 [ PF ZF ] cs 0x8 8 ss 0x10 16 ds 0x10 16 es 0x10 16 fs 0x0 0 gs 0xb800 47104 (gdb) si 0x00200291 in ?? () => 0x00200291: ee out %al,(%dx) 12: /x $eax = 0x3 11: /x $ebx = 0xfe004144 10: /x $ecx = 0x4144 9: /x $edx = 0x3f8 8: /x $esi = 0x9f400 7: /x $edi = 0x200200 6: /x $ebp = 0xf9a 5: /x $esp = 0x9fffc 4: /x $es = 0x10 3: /x $ds = 0x10 2: /x $cs = 0x8 1: /x $ss = 0x10 (gdb) info reg eax 0x3 3 ecx 0x4144 16708 edx 0x3f8 1016 ebx 0xfe004144 -33537724 esp 0x9fffc 0x9fffc ebp 0xf9a 0xf9a esi 0x9f400 652288 edi 0x200200 2097664 eip 0x200291 0x200291 eflags 0x82 [ SF ] cs 0x8 8 ss 0x10 16 ds 0x10 16 es 0x10 16 fs 0x0 0 gs 0xb800 47104
last updated 2011-12-13 16:12:10. served from tektonic.jcomeau.com