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A userspace process can now GPF and the OS goes on!

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This is really rickety, but it kinda sorta works for my test GPF!
This commit is contained in:
Andreas Kling 2018-10-17 23:49:32 +02:00
parent 77299cf54d
commit 56c1f9db8e
8 changed files with 96 additions and 42 deletions
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64
Kernel/i386.cpp
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@ -26,6 +26,68 @@ WORD allocateGDTEntry()
return newGDTEntry;
}
extern volatile dword exception_state_dump;
extern volatile word exception_code;
asm(
".globl exception_state_dump\n"
"exception_state_dump:\n"
".long 0\n"
".globl exception_code\n"
"exception_code:\n"
".short 0\n"
);
#define EH_ENTRY(ec) \
extern "C" void exception_ ## ec ## _handler(); \
extern "C" void exception_ ## ec ## _entry(); \
asm( \
".globl exception_" # ec "_entry\n" \
"exception_" # ec "_entry: \n" \
" pop exception_code\n" \
" pusha\n" \
" pushw %ds\n" \
" pushw %es\n" \
" pushw %fs\n" \
" pushw %gs\n" \
" pushw %ss\n" \
" pushw %ss\n" \
" pushw %ss\n" \
" pushw %ss\n" \
" popw %ds\n" \
" popw %es\n" \
" popw %fs\n" \
" popw %gs\n" \
" mov %esp, exception_state_dump\n" \
" call exception_" # ec "_handler\n" \
" popw %gs\n" \
" popw %fs\n" \
" popw %es\n" \
" popw %ds\n" \
" popa\n" \
" iret\n" \
);
EH_ENTRY(13)
void exception_13_handler()
{
auto& regs = *reinterpret_cast<RegisterDump*>(exception_state_dump);
kprintf("Process crash: %u(%s)\n", current->pid(), current->name().characters());
kprintf("exception code: %w\n", exception_code);
kprintf("pc=%w:%x ds=%w es=%w fs=%w gs=%w\n", regs.cs, regs.eip, regs.ds, regs.es, regs.fs, regs.gs);
kprintf("eax=%x ebx=%x ecx=%x edx=%x\n", regs.eax, regs.ebx, regs.ecx, regs.edx);
kprintf("ebp=%x esp=%x esi=%x edi=%x\n", regs.ebp, regs.esp, regs.esi, regs.edi);
current->setState(Task::Crashing);
if (!scheduleNewTask()) {
kprintf("Failed to schedule a new task :(\n");
HANG;
}
switchNow();
}
#define EH(i, msg) \
static void _exception ## i () \
{ \
@ -164,7 +226,7 @@ void idt_init()
registerInterruptHandler(0x0a, _exception10);
registerInterruptHandler(0x0b, _exception11);
registerInterruptHandler(0x0c, _exception12);
registerInterruptHandler(0x0d, _exception13);
registerInterruptHandler(0x0d, exception_13_entry);
registerInterruptHandler(0x0e, _exception14);
registerInterruptHandler(0x0f, _exception15);
registerInterruptHandler(0x10, _exception16);