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generated by cgit v1.2.3 (git 2.25.1) at 2026-02-15 00:21:06 +0000
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#include <xen/config.h>
#include <xen/version.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/symbols.h>
#include <xen/console.h>
#include <xen/sched.h>
#include <xen/shutdown.h>
#include <xen/nmi.h>
#include <asm/current.h>
#include <asm/flushtlb.h>
#include <asm/msr.h>
#include <asm/page.h>
#include <asm/shadow.h>
#include <asm/hvm/hvm.h>
#include <asm/hvm/support.h>

#include <public/callback.h>

static void print_xen_info(void)
{
    char taint_str[TAINT_STRING_MAX_LEN];
    char debug = 'n';

#ifndef NDEBUG
    debug = 'y';
#endif

    printk("----[ Xen-%d.%d%s  x86_64  debug=%c  %s ]----\n",
           xen_major_version(), xen_minor_version(), xen_extra_version(),
           debug, print_tainted(taint_str));
}

void show_registers(struct cpu_user_regs *regs)
{
    struct cpu_user_regs fault_regs = *regs;
    unsigned long fault_crs[8];
    const char *context;

    if ( is_hvm_vcpu(current) && guest_mode(regs) )
    {
        context = "hvm";
        hvm_store_cpu_guest_regs(current, &fault_regs, fault_crs);
    }
    else
    {
        if ( guest_mode(regs) )
        {
            context = "guest";
            fault_crs[2] = current->vcpu_info->arch.cr2;
        }
        else
        {
            context = "hypervisor";
            fault_crs[2] = read_cr2();
        }

        fault_crs[0] = read_cr0();
        fault_crs[3] = read_cr3();
        fault_crs[4] = read_cr4();
        fault_regs.ds = read_segment_register(ds);
        fault_regs.es = read_segment_register(es);
        fault_regs.fs = read_segment_register(fs);
        fault_regs.gs = read_segment_register(gs);
    }

    print_xen_info();
    printk("CPU:    %d\nRIP:    %04x:[<%016lx>]",
           smp_processor_id(), fault_regs.cs, fault_regs.rip);
    if ( !guest_mode(regs) )
        print_symbol(" %s", fault_regs.rip);
    printk("\nRFLAGS: %016lx   CONTEXT: %s\n", fault_regs.rflags, context);
    printk("rax: %016lx   rbx: %016lx   rcx: %016lx\n",
           fault_regs.rax, fault_regs.rbx, fault_regs.rcx);
    printk("rdx: %016lx   rsi: %016lx   rdi: %016lx\n",
           fault_regs.rdx, fault_regs.rsi, fault_regs.rdi);
    printk("rbp: %016lx   rsp: %016lx   r8:  %016lx\n",
           fault_regs.rbp, fault_regs.rsp, fault_regs.r8);
    printk("r9:  %016lx   r10: %016lx   r11: %016lx\n",
           fault_regs.r9,  fault_regs.r10, fault_regs.r11);
    printk("r12: %016lx   r13: %016lx   r14: %016lx\n",
           fault_regs.r12, fault_regs.r13, fault_regs.r14);
    printk("r15: %016lx   cr0: %016lx   cr4: %016lx\n",
           fault_regs.r15, fault_crs[0], fault_crs[4]);
    printk("cr3: %016lx   cr2: %016lx\n", fault_crs[3], fault_crs[2]);
    printk("ds: %04x   es: %04x   fs: %04x   gs: %04x   "
           "ss: %04x   cs: %04x\n",
           fault_regs.ds, fault_regs.es, fault_regs.fs,
           fault_regs.gs, fault_regs.ss, fault_regs.cs);
}

void show_page_walk(unsigned long addr)
{
    unsigned long pfn, mfn = read_cr3() >> PAGE_SHIFT;
    l4_pgentry_t l4e, *l4t;
    l3_pgentry_t l3e, *l3t;
    l2_pgentry_t l2e, *l2t;
    l1_pgentry_t l1e, *l1t;

    printk("Pagetable walk from %016lx:\n", addr);

    l4t = mfn_to_virt(mfn);
    l4e = l4t[l4_table_offset(addr)];
    mfn = l4e_get_pfn(l4e);
    pfn = get_gpfn_from_mfn(mfn);
    printk(" L4[0x%03lx] = %"PRIpte" %016lx\n",
           l4_table_offset(addr), l4e_get_intpte(l4e), pfn);
    if ( !(l4e_get_flags(l4e) & _PAGE_PRESENT) )
        return;

    l3t = mfn_to_virt(mfn);
    l3e = l3t[l3_table_offset(addr)];
    mfn = l3e_get_pfn(l3e);
    pfn = get_gpfn_from_mfn(mfn);
    printk(" L3[0x%03lx] = %"PRIpte" %016lx\n",
           l3_table_offset(addr), l3e_get_intpte(l3e), pfn);
    if ( !(l3e_get_flags(l3e) & _PAGE_PRESENT) )
        return;

    l2t = mfn_to_virt(mfn);
    l2e = l2t[l2_table_offset(addr)];
    mfn = l2e_get_pfn(l2e);
    pfn = get_gpfn_from_mfn(mfn);
    printk(" L2[0x%03lx] = %"PRIpte" %016lx %s\n",
           l2_table_offset(addr), l2e_get_intpte(l2e), pfn,
           (l2e_get_flags(l2e) & _PAGE_PSE) ? "(PSE)" : "");
    if ( !(l2e_get_flags(l2e) & _PAGE_PRESENT) ||
         (l2e_get_flags(l2e) & _PAGE_PSE) )
        return;

    l1t = mfn_to_virt(mfn);
    l1e = l1t[l1_table_offset(addr)];
    mfn = l1e_get_pfn(l1e);
    pfn = get_gpfn_from_mfn(mfn);
    printk(" L1[0x%03lx] = %"PRIpte" %016lx\n",
           l1_table_offset(addr), l1e_get_intpte(l1e), pfn);
}

asmlinkage void double_fault(void);
asmlinkage void do_double_fault(struct cpu_user_regs *regs)
{
    unsigned int cpu, tr;

    asm ( "str %0" : "=r" (tr) );
    cpu = ((tr >> 3) - __FIRST_TSS_ENTRY) >> 2;

    watchdog_disable();

    console_force_unlock();

    /* Find information saved during fault and dump it to the console. */
    printk("*** DOUBLE FAULT ***\n");
    print_xen_info();
    printk("CPU:    %d\nRIP:    %04x:[<%016lx>]",
           cpu, regs->cs, regs->rip);
    print_symbol(" %s", regs->rip);
    printk("\nRFLAGS: %016lx\n", regs->rflags);
    printk("rax: %016lx   rbx: %016lx   rcx: %016lx\n",
           regs->rax, regs->rbx, regs->rcx);
    printk("rdx: %016lx   rsi: %016lx   rdi: %016lx\n",
           regs->rdx, regs->rsi, regs->rdi);
    printk("rbp: %016lx   rsp: %016lx   r8:  %016lx\n",
           regs->rbp, regs->rsp, regs->r8);
    printk("r9:  %016lx   r10: %016lx   r11: %016lx\n",
           regs->r9,  regs->r10, regs->r11);
    printk("r12: %016lx   r13: %016lx   r14: %016lx\n",
           regs->r12, regs->r13, regs->r14);
    printk("r15: %016lx\n", regs->r15);
    show_stack_overflow(regs->rsp);

    panic("DOUBLE FAULT -- system shutdown\n");
}

void toggle_guest_mode(struct vcpu *v)
{
    v->arch.flags ^= TF_kernel_mode;
    __asm__ __volatile__ ( "swapgs" );
    update_cr3(v);
#ifdef USER_MAPPINGS_ARE_GLOBAL
    /* Don't flush user global mappings from the TLB. Don't tick TLB clock. */
    __asm__ __volatile__ ( "mov %0, %%cr3" : : "r" (v->arch.cr3) : "memory" );
#else
    write_ptbase(v);
#endif
}

unsigned long do_iret(void)
{
    struct cpu_user_regs *regs = guest_cpu_user_regs();
    struct iret_context iret_saved;
    struct vcpu *v = current;

    if ( unlikely(copy_from_user(&iret_saved, (void *)regs->rsp,
                                 sizeof(iret_saved))) )
    {
        gdprintk(XENLOG_ERR, "Fault while reading IRET context from "
                "guest stack\n");
        goto exit_and_crash;
    }

    /* Returning to user mode? */
    if ( (iret_saved.cs & 3) == 3 )
    {
        if ( unlikely(pagetable_is_null(v->arch.guest_table_user)) )
        {
            gdprintk(XENLOG_ERR, "Guest switching to user mode with no "
                    "user page tables\n");
            goto exit_and_crash;
        }
        toggle_guest_mode(v);
    }

    regs->rip    = iret_saved.rip;
    regs->cs     = iret_saved.cs | 3; /* force guest privilege */
    regs->rflags = (iret_saved.rflags & ~(EF_IOPL|EF_VM)) | EF_IE;
    regs->rsp    = iret_saved.rsp;
    regs->ss     = iret_saved.ss | 3; /* force guest privilege */

    if ( !(iret_saved.flags & VGCF_in_syscall) )
    {
        regs->entry_vector = 0;
        regs->r11 = iret_saved.r11;
        regs->rcx = iret_saved.rcx;
    }

    /* No longer in NMI context. */
    clear_bit(_VCPUF_nmi_masked, &current->vcpu_flags);