1 // arch/x86/misc.cc -- Misc. arch-specific stuff
3 // This software is copyright (c) 2006 Scott Wood <scott@buserror.net>.
5 // This software is provided 'as-is', without any express or implied warranty.
6 // In no event will the authors or contributors be held liable for any damages
7 // arising from the use of this software.
9 // Permission is hereby granted to everyone, free of charge, to use, copy,
10 // modify, prepare derivative works of, publish, distribute, perform,
11 // sublicense, and/or sell copies of the Software, provided that the above
12 // copyright notice and disclaimer of warranty be included in all copies or
13 // substantial portions of this software.
15 #include <kern/types.h>
16 #include <kern/libc.h>
17 #include <kern/arch.h>
18 #include <kern/i8259.h>
19 #include <kern/time.h>
20 #include <kern/thread.h>
22 #include <kern/process.h>
25 #include <arch/addrs.h>
26 #include <arch/multiboot.h>
27 #include <arch/regs.h>
29 extern u32 x86_init_ptbl_l2[1024];
32 u8 stack[4096 - ::Threads::thread_size];
33 ::Threads::Thread thread;
34 } __attribute__((aligned(4096))) x86_init_stack;
40 void show_regs(Regs *regs)
42 printf("eax: 0x%08x ecx: 0x%08x edx: 0x%08x ebx: 0x%08x\n"
43 "esp: 0x%08x ebp: 0x%08x esi: 0x%08x edi: 0x%08x\n"
44 "eflags: 0x%08x ds: %04x es: %04x ss: %04x\n",
45 regs->eax, regs->ecx, regs->edx, regs->ebx,
46 regs->cs & 3 ? regs->user_esp : (u32)regs + (u32)sizeof(regs),
47 regs->ebp, regs->esi, regs->edi, regs->eflags,
48 regs->ds, regs->es, regs->cs & 3 ? regs->user_ss : regs->ds);
50 printf("Stack trace: ");
51 u32 *frame = (u32 *)regs->ebp;
53 for (int i = 2; i < 32; i++) {
54 u32 stackptr = frame[1];
55 frame = (u32 *)frame[0];
57 if ((u32)frame < 0x80000000UL)
63 printf("0x%08x ", stackptr);
67 struct TimerInt : public IRQ::Interrupt {
70 Time::monotonic_timers->run();
79 ::Threads::Thread *init_thread;
83 init_thread = &x86_init_stack.thread;
84 Priv::early_adjust_mappings();
86 Priv::MultiBoot::process_info();
89 u32 tss_addr = reinterpret_cast<u32>(&Priv::tss);
90 x86_gdt[3].base_low = tss_addr & 0xffff;
91 x86_gdt[3].base_mid = (tss_addr & 0xff0000) >> 16;
92 x86_gdt[3].base_high = (tss_addr & 0xff000000) >> 24;
95 asm volatile("ltr %w0" : : "r" (0x18) : "memory");
96 init_thread->addr_space = new Mem::ProcAddrSpace(x86_init_ptbl_l2);
97 init_thread->active_addr_space = init_thread->addr_space;
102 IRQ::InterruptSlot *timer = i8259.get_slot(0);
103 i8259.request_int(timer, &Priv::timer_int);
106 void ArchThread::init(void *entry, void *arg)
108 void **stack = reinterpret_cast<void **>(this);
119 using Arch::Priv::show_regs;
120 using Arch::Priv::Regs;
122 extern "C" void x86_do_diverr(Regs *regs)
124 printf("Division error at 0x%04x:0x%08x\n", regs->cs, regs->eip);
129 extern "C" void x86_do_debug(Regs *regs)
131 printf("Debug exception at 0x%04x:0x%08x\n", regs->cs, regs->eip);
136 extern "C" void x86_do_breakpoint(Regs *regs)
138 printf("Breakpoint at 0x%04x:0x%08x\n", regs->cs, regs->eip);
143 extern "C" void x86_do_invalid_insn(Regs *regs)
145 printf("Invalid instruction at 0x%04x:0x%08x\n", regs->cs, regs->eip);
150 extern "C" void x86_do_page_fault(Regs *regs, u32 fault_addr, u32 error_code)
157 // A reserved bit was set in the PTE; this is always a bug.
161 // Don't try to fix up a page fault if interrupts were disabled. It is an
162 // error to access non-locked pages with interrupts disabled. Trying to
163 // fix it up in the case of an access that would be legitimate if interrupts
164 // were enabled would simply mask the loss of atomicity, and trying to grab
165 // locks to look up the address if it is a completely bad reference won't
166 // accomplish much other than decreasing the odds that the fault message
169 if (!(regs->eflags & 0x200))
172 // Don't allow fault-ins using a borrowed addr-space.
173 as = curthread->addr_space;
175 if (!as || curthread == Arch::init_thread)
181 if (as->handle_fault(fault_addr, error_code & 2,
182 false /* error_code & 16 */, error_code & 4))
185 // FIXME: throw exception to user
191 printf("Page fault at 0x%04x:0x%08x for 0x%08x, error code: 0x%04x\n",
192 regs->cs, regs->eip, fault_addr, error_code);
199 extern "C" void x86_do_gpf(Regs *regs, u32 error_code)
206 printf("General protection fault at 0x%04x:0x%08x, error code: 0x%04x\n",
207 regs->cs, regs->eip, error_code);
214 extern "C" void x86_do_irq(int irq)
216 IRQ::i8259.handle_irq(irq - 0x20);
223 System::RunTime::ParamInfoBlock *pib;
232 ulong eip, cs, eflags, user_esp, user_ss;
236 extern "C" void x86_invoke_method(Arch::Priv::OrbRegs *regs)
238 assert(regs->cs & 3);
239 ORB::invoke_method(regs->pib, regs->user_esp);
242 extern "C" void x86_return_from_method(Arch::Priv::OrbRegs *regs)
244 assert(regs->cs & 3);
245 regs->user_esp = ORB::return_from_method(regs->exptr, regs->exlen);