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#include <xen/config.h>
#include <xen/init.h>
#include <xen/sched.h>
#include <xen/lib.h>
#include <xen/errno.h>
#include <xen/mm.h>
#include <xen/irq.h>
#include <xen/console.h>
#include <xen/sched.h>
#include <asm/flushtlb.h>
#include <asm/msr.h>
void show_registers(struct cpu_user_regs *regs)
{
printk("CPU: %d\nEIP: %04x:[<%016lx>] \nEFLAGS: %016lx\n",
smp_processor_id(), 0xffff & regs->cs, regs->rip, regs->eflags);
printk("rax: %016lx rbx: %016lx rcx: %016lx rdx: %016lx\n",
regs->rax, regs->rbx, regs->rcx, regs->rdx);
printk("rsi: %016lx rdi: %016lx rbp: %016lx rsp: %016lx\n",
regs->rsi, regs->rdi, regs->rbp, regs->rsp);
printk("r8: %016lx r9: %016lx r10: %016lx r11: %016lx\n",
regs->r8, regs->r9, regs->r10, regs->r11);
printk("r12: %016lx r13: %016lx r14: %016lx r15: %016lx\n",
regs->r12, regs->r13, regs->r14, regs->r15);
if ( GUEST_MODE(regs) )
show_guest_stack();
else
show_stack((unsigned long *)regs->rsp);
}
void show_page_walk(unsigned long addr)
{
unsigned long page = read_cr3();
printk("Pagetable walk from %016lx:\n", addr);
page &= PAGE_MASK;
page = ((unsigned long *) __va(page))[l4_table_offset(addr)];
printk(" L4 = %016lx\n", page);
if ( !(page & _PAGE_PRESENT) )
return;
page &= PAGE_MASK;
page = ((unsigned long *) __va(page))[l3_table_offset(addr)];
printk(" L3 = %016lx\n", page);
if ( !(page & _PAGE_PRESENT) )
return;
page &= PAGE_MASK;
page = ((unsigned long *) __va(page))[l2_table_offset(addr)];
printk(" L2 = %016lx %s\n", page, (page & _PAGE_PSE) ? "(2MB)" : "");
if ( !(page & _PAGE_PRESENT) || (page & _PAGE_PSE) )
return;
page &= PAGE_MASK;
page = ((unsigned long *) __va(page))[l1_table_offset(addr)];
printk(" L1 = %016lx\n", page);
}
asmlinkage void double_fault(void);
asmlinkage void do_double_fault(struct cpu_user_regs *regs)
{
watchdog_disable();
console_force_unlock();
/* Find information saved during fault and dump it to the console. */
printk("************************************\n");
show_registers(regs);
printk("************************************\n");
printk("CPU%d DOUBLE FAULT -- system shutdown\n", smp_processor_id());
printk("System needs manual reset.\n");
printk("************************************\n");
/* Lock up the console to prevent spurious output from other CPUs. */
console_force_lock();
/* Wait for manual reset. */
for ( ; ; )
__asm__ __volatile__ ( "hlt" );
}
asmlinkage void syscall_enter(void);
void __init percpu_traps_init(void)
{
char *stack_bottom, *stack;
int cpu = smp_processor_id();
if ( cpu == 0 )
{
/* Specify dedicated interrupt stacks for NMIs and double faults. */
set_intr_gate(TRAP_double_fault, &double_fault);
idt_table[TRAP_double_fault].a |= 1UL << 32; /* IST1 */
idt_table[TRAP_nmi].a |= 2UL << 32; /* IST2 */
}
stack_bottom = (char *)get_stack_bottom();
stack = (char *)((unsigned long)stack_bottom & ~(STACK_SIZE - 1));
/* Double-fault handler has its own per-CPU 1kB stack. */
init_tss[cpu].ist[0] = (unsigned long)&stack[1024];
/* NMI handler has its own per-CPU 1kB stack. */
init_tss[cpu].ist[1] = (unsigned long)&stack[2048];
/*
* Trampoline for SYSCALL entry from long mode.
*/
/* Skip the NMI and DF stacks. */
stack = &stack[2048];
wrmsr(MSR_LSTAR, (unsigned long)stack, ((unsigned long)stack>>32));
/* movq %rsp, saversp(%rip) */
stack[0] = 0x48;
stack[1] = 0x89;
stack[2] = 0x25;
*(u32 *)&stack[3] = (stack_bottom - &stack[7]) - 16;
/* leaq saversp(%rip), %rsp */
stack[7] = 0x48;
stack[8] = 0x8d;
stack[9] = 0x25;
*(u32 *)&stack[10] = (stack_bottom - &stack[14]) - 16;
/* pushq %r11 */
stack[14] = 0x41;
stack[15] = 0x53;
/* pushq $__GUEST_CS64 */
stack[16] = 0x68;
*(u32 *)&stack[17] = __GUEST_CS64;
/* jmp syscall_enter */
stack[21] = 0xe9;
*(u32 *)&stack[22] = (char *)syscall_enter - &stack[26];
/*
* Trampoline for SYSCALL entry from compatibility mode.
*/
/* Skip the long-mode entry trampoline. */
stack = &stack[26];
wrmsr(MSR_CSTAR, (unsigned long)stack, ((unsigned long)stack>>32));
/* movq %rsp, saversp(%rip) */
stack[0] = 0x48;
stack[1] = 0x89;
stack[2] = 0x25;
*(u32 *)&stack[3] = (stack_bottom - &stack[7]) - 16;
/* leaq saversp(%rip), %rsp */
stack[7] = 0x48;
stack[8] = 0x8d;
stack[9] = 0x25;
*(u32 *)&stack[10] = (stack_bottom - &stack[14]) - 16;
/* pushq %r11 */
stack[14] = 0x41;
stack[15] = 0x53;
/* pushq $__GUEST_CS32 */
stack[16] = 0x68;
*(u32 *)&stack[17] = __GUEST_CS32;
/* jmp syscall_enter */
stack[21] = 0xe9;
*(u32 *)&stack[22] = (char *)syscall_enter - &stack[26];
/*
* Common SYSCALL parameters.
*/
wrmsr(MSR_STAR, 0, (FLAT_RING3_CS32<<16) | __HYPERVISOR_CS);
wrmsr(MSR_SYSCALL_MASK, EF_VM|EF_RF|EF_NT|EF_DF|EF_IE|EF_TF, 0U);
}
long do_set_callbacks(unsigned long event_address,
unsigned long failsafe_address,
unsigned long syscall_address)
{
struct exec_domain *d = current;
d->arch.guest_context.event_callback_eip = event_address;
d->arch.guest_context.failsafe_callback_eip = failsafe_address;
d->arch.guest_context.syscall_callback_eip = syscall_address;
return 0;
}
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