triple fault executing kernel
Posted: Thu Nov 05, 2015 6:14 pm
Dear all,
i recently changed my small os to be loaded from a vbr, in this way:
mbr -> vbr -> os
So the vbr actually reads 255 sectors from IDE /virtual, bochs) disk and loads it to 0x1e0000.
So the os code is build as to be executed at 0x1e0000.
The os binary includes a startup.S that just jump to the main function in main.o
But at the moment the jump to kmain is taken (kmain is @ 0x1e2667, seen from map file)
i get the following error:
You see, RIP register is exactly at 0x1e2667 where kmain starts.
Every help is very appreciated,
thanks
Angelo
i recently changed my small os to be loaded from a vbr, in this way:
mbr -> vbr -> os
So the vbr actually reads 255 sectors from IDE /virtual, bochs) disk and loads it to 0x1e0000.
So the os code is build as to be executed at 0x1e0000.
The os binary includes a startup.S that just jump to the main function in main.o
Code: Select all
.file "startup.S"
.text
.code64
start:
mov $_kmain, %rax
jmp *%rax
i get the following error:
Code: Select all
00018056871e[CPU0 ] interrupt(long mode): IDT entry extended attributes DWORD4 TYPE != 0
00018056871e[CPU0 ] interrupt(long mode): IDT entry extended attributes DWORD4 TYPE != 0
00018056871i[CPU0 ] CPU is in long mode (active)
00018056871i[CPU0 ] CS.mode = 64 bit
00018056871i[CPU0 ] SS.mode = 64 bit
00018056871i[CPU0 ] EFER = 0x00000500
00018056871i[CPU0 ] | RAX=00000000001e2667 RBX=0000000000000081
00018056871i[CPU0 ] | RCX=0000000000000000 RDX=00000000000001f0
00018056871i[CPU0 ] | RSP=0000000000217dd0 RBP=000000000000010b
00018056871i[CPU0 ] | RSI=00000000000e0174 RDI=0000000000200000
00018056871i[CPU0 ] | R8=0000000000000000 R9=0000000000000000
00018056871i[CPU0 ] | R10=0000000000000000 R11=0000000000000000
00018056871i[CPU0 ] | R12=0000000000000000 R13=0000000000000000
00018056871i[CPU0 ] | R14=0000000000000000 R15=0000000000000000
00018056871i[CPU0 ] | IOPL=0 id vip vif ac vm RF nt of df if tf sf ZF af PF cf
00018056871i[CPU0 ] | SEG sltr(index|ti|rpl) base limit G D
00018056871i[CPU0 ] | CS:0008( 0001| 0| 0) 00000000 00000000 0 0
00018056871i[CPU0 ] | DS:0010( 0002| 0| 0) 00000000 00000000 0 0
00018056871i[CPU0 ] | SS:0010( 0002| 0| 0) 00000000 00000000 0 0
00018056871i[CPU0 ] | ES:0010( 0002| 0| 0) 00000000 00000000 0 0
00018056871i[CPU0 ] | FS:0010( 0002| 0| 0) 00000000 00000000 0 0
00018056871i[CPU0 ] | GS:0010( 0002| 0| 0) 00000000 00000000 0 0
00018056871i[CPU0 ] | MSR_FS_BASE:0000000000000000
00018056871i[CPU0 ] | MSR_GS_BASE:0000000000000000
00018056871i[CPU0 ] | RIP=00000000001e2667 (00000000001e2667)
00018056871i[CPU0 ] | CR0=0xe0000011 CR2=0x0000000000217dc8
00018056871i[CPU0 ] | CR3=0x00001000 CR4=0x00000020
(0).[18056871] [0x00000000001e2667] 0008:00000000001e2667 (unk. ctxt): push rbp ; 55
00018056871e[CPU0 ] exception(): 3rd (13) exception with no resolution, shutdown status is 00h, resetting
00018056871i[SYS ] bx_pc_system_c::Reset(HARDWARE) called
00018056871i[CPU0 ] cpu hardware reset
00018056871i[APIC0] allocate APIC id=0 (MMIO enabled) to 0x00000000fee00000
00018056871i[CPU0 ] CPUID[0x00000000]: 00000002 756e6547 6c65746e 49656e69
00018056871i[CPU0 ] CPUID[0x00000001]: 00000633 00010800 00002028 1fcbfbff
00018056871i[CPU0 ] CPUID[0x00000002]: 00410601 00000000 00000000 00000000
00018056871i[CPU0 ] CPUID[0x80000000]: 80000008 00000000 00000000 00000000
00018056871i[CPU0 ] CPUID[0x80000001]: 00000000 00000000 00000101 2a100000
00018056871i[CPU0 ] CPUID[0x80000002]: 20202020 20202020 20202020 6e492020
00018056871i[CPU0 ] CPUID[0x80000003]: 286c6574 50202952 69746e65 52286d75
00018056871i[CPU0 ] CPUID[0x80000004]: 20342029 20555043 20202020 00202020
00018056871i[CPU0 ] CPUID[0x80000005]: 01ff01ff 01ff01ff 40020140 40020140
00018056871i[CPU0 ] CPUID[0x80000006]: 00000000 42004200 02008140 00000000
00018056871i[CPU0 ] CPUID[0x80000007]: 00000000 00000000 00000000 00000000
00018056871i[CPU0 ] CPUID[0x80000008]: 00003028 00000000 00000000 00000000
00018056871i[PLGIN] reset of 'pci' plugin device by virtual method
00018056871i[PLGIN] reset of 'pci2isa' plugin device by virtual method
00018056871i[PLGIN] reset of 'cmos' plugin device by virtual method
00018056871i[PLGIN] reset of 'dma' plugin device by virtual method
00018056871i[PLGIN] reset of 'pic' plugin device by virtual method
00018056871i[PLGIN] reset of 'pit' plugin device by virtual method
00018056871i[PLGIN] reset of 'floppy' plugin device by virtual method
00018056871i[PLGIN] reset of 'vga' plugin device by virtual method
00018056871i[PLGIN] reset of 'acpi' plugin device by virtual method
00018056871i[PLGIN] reset of 'ioapic' plugin device by virtual method
00018056871i[PLGIN] reset of 'keyboard' plugin device by virtual method
00018056871i[PLGIN] reset of 'harddrv' plugin device by virtual method
00018056871i[PLGIN] reset of 'pci_ide' plugin device by virtual method
00018056871i[PLGIN] reset of 'unmapped' plugin device by virtual method
00018056871i[PLGIN] reset of 'biosdev' plugin device by virtual method
00018056871i[PLGIN] reset of 'speaker' plugin device by virtual method
00018056871i[PLGIN] reset of 'extfpuirq' plugin device by virtual method
00018056871i[PLGIN] reset of 'parallel' plugin device by virtual method
00018056871i[PLGIN] reset of 'serial' plugin device by virtual method
00018056871i[PLGIN] reset of 'gameport' plugin device by virtual method
00018056871i[PLGIN] reset of 'iodebug' plugin device by virtual method
Next at t=18056872
(0) [0x00000000fffffff0] f000:fff0 (unk. ctxt): jmp far f000:e05b ; ea5be000f0
00018056872i[XGUI ] Mouse capture off
<bochs:2> ^C00018056872i[ ] Ctrl-C detected in signal handler.
You see, RIP register is exactly at 0x1e2667 where kmain starts.
Every help is very appreciated,
thanks
Angelo