"kdd" Windows debugger stub.
kdd runs in dom0, attaches to a domain and speaks the Windows kd serial
protocol over a TCP connection (which should go to kd or windbg, e.g.
by having another VM with its virtual COM1 set up as a TCP listener).
It doesn't do breakpoints &c yet, and windbg can get quite confused
since the kernel debugger's not actually running, but it's good enough
to extract backtraces from wedged VMs.
Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
diff -r ac7f64d5577b tools/Makefile
--- a/tools/Makefile Wed Oct 20 09:56:36 2010 +0100
+++ b/tools/Makefile Mon Oct 25 15:12:21 2010 +0100
@@ -36,6 +36,7 @@ SUBDIRS-y += remus
SUBDIRS-y += remus
SUBDIRS-$(CONFIG_X86) += xenpaging
SUBDIRS-$(CONFIG_X86) += debugger/gdbsx
+SUBDIRS-$(CONFIG_X86) += debugger/kdd
# These don't cross-compile
ifeq ($(XEN_COMPILE_ARCH),$(XEN_TARGET_ARCH))
@@ -128,5 +129,15 @@ subdir-all-debugger/gdbsx: .phony
subdir-all-debugger/gdbsx: .phony
$(MAKE) -C debugger/gdbsx all
+
+subdir-clean-debugger/kdd subdir-distclean-debugger/kdd: .phony
+ $(MAKE) -C debugger/kdd clean
+
+subdir-install-debugger/kdd: .phony
+ $(MAKE) -C debugger/kdd install
+
+subdir-all-debugger/kdd: .phony
+ $(MAKE) -C debugger/kdd all
+
subdir-distclean-firmware: .phony
$(MAKE) -C firmware distclean
diff -r ac7f64d5577b tools/debugger/kdd/Makefile
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/debugger/kdd/Makefile Mon Oct 25 15:12:21 2010 +0100
@@ -0,0 +1,22 @@
+XEN_ROOT = ../../..
+include $(XEN_ROOT)/tools/Rules.mk
+
+CFLAGS += $(CFLAGS_libxenctrl)
+LDLIBS += $(LDLIBS_libxenctrl)
+
+CFILES := kdd.c kdd-xen.c
+OBJS := $(CFILES:.c=.o)
+
+all: kdd
+
+kdd: $(OBJS)
+ $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+
+.PHONY: clean
+clean:
+ rm -f $(OBJS) kdd
+
+.PHONY: install
+install: all
+ [ -d $(DESTDIR)$(SBINDIR) ] || $(INSTALL_DIR) $(DESTDIR)$(SBINDIR)
+ $(INSTALL_PROG) kdd $(DESTDIR)$(SBINDIR)/kdd
diff -r ac7f64d5577b tools/debugger/kdd/kdd-xen.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/debugger/kdd/kdd-xen.c Mon Oct 25 15:12:21 2010 +0100
@@ -0,0 +1,625 @@
+/*
+ * kdd-xen.c -- xen-specific functions for the kdd debugging stub
+ *
+ * Tim Deegan <Tim.Deegan@xxxxxxxxxx>
+ *
+ * Copyright (c) 2007-2010, Citrix Systems Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+
+#include <xenctrl.h>
+#include <xen/xen.h>
+#include <xen/hvm/save.h>
+
+#include "kdd.h"
+
+#define MAPSIZE 4093 /* Prime */
+
+#define PAGE_SHIFT 12
+#define PAGE_SIZE (1U << PAGE_SHIFT)
+
+struct kdd_guest {
+ struct xentoollog_logger xc_log; /* Must be first for xc log callbacks */
+ xc_interface *xc_handle;
+ uint32_t domid;
+ char id[80];
+ FILE *log;
+ int verbosity;
+ void *hvm_buf;
+ uint32_t hvm_sz;
+ uint32_t pfns[MAPSIZE];
+ void * maps[MAPSIZE];
+};
+
+
+/* Flush any mappings we have of the guest memory: it's not polite
+ * top hold on to them while the guest is running */
+static void flush_maps(kdd_guest *g)
+{
+ int i;
+ for (i = 0; i < MAPSIZE; i++) {
+ if (g->maps[i] != NULL)
+ munmap(g->maps[i], PAGE_SIZE);
+ g->maps[i] = NULL;
+ }
+}
+
+
+/* Halt the guest so we can debug it */
+void kdd_halt(kdd_guest *g)
+{
+ uint32_t sz;
+ void *buf;
+
+ xc_domain_pause(g->xc_handle, g->domid);
+
+ /* How much space do we need for the HVM state? */
+ sz = xc_domain_hvm_getcontext(g->xc_handle, g->domid, 0, 0);
+ if (sz == (uint32_t) -1) {
+ KDD_LOG(g, "Can't get HVM state size for domid %"PRIu32": %s\n",
+ g->domid, strerror(errno));
+ return;
+ }
+ buf = realloc(g->hvm_buf, sz);
+ if (!buf) {
+ KDD_LOG(g, "Couldn't allocate %"PRIu32" for HVM buffer\n", sz);
+ return;
+ }
+ g->hvm_buf = buf;
+ g->hvm_sz = sz;
+ memset(buf, 0, sz);
+
+ /* Get the HVM state */
+ sz = xc_domain_hvm_getcontext(g->xc_handle, g->domid, buf, sz);
+ if (sz == (uint32_t) -1) {
+ KDD_LOG(g, "Can't get HVM state for domid %"PRIu32": %s\n",
+ g->domid, strerror(errno));
+ }
+}
+
+/* Check whether the guest has stopped. Returns 'interesting' vcpu or -1 */
+/* TODO: open DEBUG_VIRQ if it's free and wait for events rather than
+ * always polling the guest state */
+int kdd_poll_guest(kdd_guest *g)
+{
+ /* TODO: finish plumbing through polling for breakpoints */
+ return 0;
+}
+
+/* Update the HVM state */
+static void hvm_writeback(kdd_guest *g)
+{
+ if (g->hvm_buf && xc_domain_hvm_setcontext(g->xc_handle, g->domid,
+ g->hvm_buf, g->hvm_sz))
+ KDD_LOG(g, "Can't set HVM state for domid %"PRIu32": %s\n",
+ g->domid, strerror(errno));
+}
+
+/* Start the guest running again */
+void kdd_run(kdd_guest *g)
+{
+ flush_maps(g);
+ hvm_writeback(g);
+ xc_domain_unpause(g->xc_handle, g->domid);
+}
+
+/* How many CPUs are there in this guest? */
+int kdd_count_cpus(kdd_guest *g)
+{
+ struct hvm_save_descriptor *desc;
+ int maxcpu = 0;
+
+ if (!g->hvm_buf)
+ return 0;
+
+ /* Scan the CPU save records. */
+ for (desc = g->hvm_buf;
+ (void *) desc >= g->hvm_buf && (void *) desc < g->hvm_buf + g->hvm_sz;
+ desc = ((void *)desc) + (sizeof *desc) + desc->length) {
+ if (desc->typecode == HVM_SAVE_CODE(CPU)) {
+ if (maxcpu < desc->instance)
+ maxcpu = desc->instance;
+ }
+ }
+ return maxcpu + 1;
+}
+
+/* Helper fn: get CPU state from cached HVM state */
+static struct hvm_hw_cpu *get_cpu(kdd_guest *g, int cpuid)
+{
+ struct hvm_save_descriptor *desc;
+ struct hvm_hw_cpu *cpu;
+
+ if (!g->hvm_buf)
+ return NULL;
+
+ /* Find the right CPU */
+ for (desc = g->hvm_buf;
+ (void *) desc >= g->hvm_buf && (void *) desc < g->hvm_buf + g->hvm_sz;
+ desc = ((void *)desc) + (sizeof *desc) + desc->length) {
+ if (desc->typecode == HVM_SAVE_CODE(CPU) && desc->instance == cpuid) {
+ cpu = ((void *)desc) + (sizeof *desc);
+ if ((void *) cpu + sizeof (*cpu) <= g->hvm_buf + g->hvm_sz)
+ return cpu;
+ }
+ }
+
+ KDD_LOG(g, "Dom %"PRIu32" has no CPU %i\n", g->domid, cpuid);
+ return NULL;
+}
+
+/* Helper fn: get APIC state from cached HVM state */
+static struct hvm_hw_lapic_regs *get_lapic(kdd_guest *g, int cpuid)
+{
+ struct hvm_save_descriptor *desc;
+ struct hvm_hw_lapic_regs *regs;
+
+ if (!g->hvm_buf)
+ return NULL;
+
+ /* Find the right CPU's LAPIC */
+ for (desc = g->hvm_buf;
+ (void *) desc >= g->hvm_buf && (void *) desc < g->hvm_buf + g->hvm_sz;
+ desc = ((void *)desc) + (sizeof *desc) + desc->length) {
+ if (desc->typecode == HVM_SAVE_CODE(LAPIC_REGS) && desc->instance ==
cpuid) {
+ regs = ((void *)desc) + (sizeof *desc);
+ if ((void *) regs + sizeof (*regs) <= g->hvm_buf + g->hvm_sz)
+ return regs;
+ }
+ }
+
+ KDD_LOG(g, "Dom %"PRIu32" has no LAPIC %i\n", g->domid, cpuid);
+ return NULL;
+}
+
+
+/* Accessors for guest user registers */
+static void kdd_get_regs_x86_32(struct hvm_hw_cpu *cpu, kdd_regs_x86_32 *r)
+{
+ r->gs = cpu->gs_sel;
+ r->fs = cpu->fs_sel;
+ r->es = cpu->es_sel;
+ r->ds = cpu->ds_sel;
+ r->edi = cpu->rdi;
+ r->esi = cpu->rsi;
+ r->ebx = cpu->rbx;
+ r->edx = cpu->rdx;
+ r->ecx = cpu->rcx;
+ r->eax = cpu->rax;
+ r->ebp = cpu->rbp;
+ r->eip = cpu->rip;
+ r->cs = cpu->cs_sel;
+ r->eflags = cpu->rflags;
+ r->esp = cpu->rsp;
+ r->ss = cpu->ss_sel;
+ memcpy(r->fp, cpu->fpu_regs, 112); // 108 save area + 4 of ???
+}
+
+static void kdd_set_regs_x86_32(struct hvm_hw_cpu *cpu, kdd_regs_x86_32 *r)
+{
+ cpu->gs_sel = r->gs;
+ cpu->fs_sel = r->fs;
+ cpu->es_sel = r->es;
+ cpu->ds_sel = r->ds;
+ cpu->rdi = r->edi;
+ cpu->rsi = r->esi;
+ cpu->rbx = r->ebx;
+ cpu->rdx = r->edx;
+ cpu->rcx = r->ecx;
+ cpu->rax = r->eax;
+ cpu->rbp = r->ebp;
+ cpu->rip = r->eip;
+ cpu->cs_sel = r->cs;
+ cpu->rflags = r->eflags;
+ cpu->rsp = r->esp;
+ cpu->ss_sel = r->ss;
+ memcpy(cpu->fpu_regs, r->fp, 112); // 108 save area + 4 of ???
+}
+
+static void kdd_get_regs_x86_64(struct hvm_hw_cpu *cpu, kdd_regs_x86_64 *r)
+{
+ // XXX debug pattern
+ uint16_t i;
+ for (i = 0 ; i < (sizeof *r / 2) ; i++)
+ ((uint16_t *)r)[i] = i;
+
+ r->cs = cpu->cs_sel;
+ r->ds = cpu->ds_sel;
+ r->es = cpu->es_sel;
+ r->fs = cpu->fs_sel;
+ r->gs = cpu->gs_sel;
+ r->ss = cpu->ss_sel;
+ r->rflags = cpu->rflags;
+ r->dr0 = cpu->dr0;
+ r->dr1 = cpu->dr1;
+ r->dr2 = cpu->dr2;
+ r->dr3 = cpu->dr3;
+ r->dr6 = cpu->dr6;
+ r->dr7 = cpu->dr7;
+ r->rax = cpu->rax;
+ r->rcx = cpu->rcx;
+ r->rdx = cpu->rdx;
+ r->rbx = cpu->rbx;
+ r->rsp = cpu->rsp;
+ r->rbp = cpu->rbp;
+ r->rsi = cpu->rsi;
+ r->rdi = cpu->rdi;
+ r->r8 = cpu->r8;
+ r->r9 = cpu->r9;
+ r->r10 = cpu->r10;
+ r->r11 = cpu->r11;
+ r->r12 = cpu->r12;
+ r->r13 = cpu->r13;
+ r->r14 = cpu->r14;
+ r->r15 = cpu->r15;
+ r->rip = cpu->rip;
+ memcpy(r->fp, cpu->fpu_regs, 112); // Definitely not right
+}
+
+static void kdd_set_regs_x86_64(struct hvm_hw_cpu *cpu, kdd_regs_x86_64 *r)
+{
+ cpu->cs_sel = r->cs;
+ cpu->ds_sel = r->ds;
+ cpu->es_sel = r->es;
+ cpu->fs_sel = r->fs;
+ cpu->gs_sel = r->gs;
+ cpu->ss_sel = r->ss;
+ cpu->rflags = r->rflags;
+ cpu->dr0 = r->dr0;
+ cpu->dr1 = r->dr1;
+ cpu->dr2 = r->dr2;
+ cpu->dr3 = r->dr3;
+ cpu->dr6 = r->dr6;
+ cpu->dr7 = r->dr7;
+ cpu->rax = r->rax;
+ cpu->rcx = r->rcx;
+ cpu->rdx = r->rdx;
+ cpu->rbx = r->rbx;
+ cpu->rsp = r->rsp;
+ cpu->rbp = r->rbp;
+ cpu->rsi = r->rsi;
+ cpu->rdi = r->rdi;
+ cpu->r8 = r->r8;
+ cpu->r9 = r->r9;
+ cpu->r10 = r->r10;
+ cpu->r11 = r->r11;
+ cpu->r12 = r->r12;
+ cpu->r13 = r->r13;
+ cpu->r14 = r->r14;
+ cpu->r15 = r->r15;
+ cpu->rip = r->rip;
+ memcpy(r->fp, cpu->fpu_regs, 112); // Definitely not right
+}
+
+
+int kdd_get_regs(kdd_guest *g, int cpuid, kdd_regs *r, int w64)
+{
+ struct hvm_hw_cpu *cpu;
+
+ cpu = get_cpu(g, cpuid);
+ if (!cpu)
+ return -1;
+
+ memset(r, 0, sizeof(r));
+
+ if (w64)
+ kdd_get_regs_x86_64(cpu, &r->r64);
+ else
+ kdd_get_regs_x86_32(cpu, &r->r32);
+
+ return 0;
+}
+
+int kdd_set_regs(kdd_guest *g, int cpuid, kdd_regs *r, int w64)
+{
+ struct hvm_hw_cpu *cpu;
+
+ cpu = get_cpu(g, cpuid);
+ if (!cpu)
+ return -1;
+
+ if (w64)
+ kdd_set_regs_x86_64(cpu, &r->r64);
+ else
+ kdd_set_regs_x86_32(cpu, &r->r32);
+
+ hvm_writeback(g);
+ return 0;
+}
+
+
+/* Accessors for guest control registers */
+static void kdd_get_ctrl_x86_32(struct hvm_hw_cpu *cpu, kdd_ctrl_x86_32 *c)
+{
+ c->cr0 = cpu->cr0;
+ c->cr2 = cpu->cr2;
+ c->cr3 = cpu->cr3;
+ c->cr4 = cpu->cr4;
+ c->dr0 = cpu->dr0;
+ c->dr1 = cpu->dr1;
+ c->dr2 = cpu->dr2;
+ c->dr3 = cpu->dr3;
+ c->dr6 = cpu->dr6;
+ c->dr7 = cpu->dr7;
+ c->gdt_base = cpu->gdtr_base;
+ c->gdt_limit = cpu->gdtr_limit;
+ c->idt_base = cpu->idtr_base;
+ c->idt_limit = cpu->idtr_limit;
+ c->tss_sel = cpu->tr_sel;
+ c->ldt_sel = cpu->ldtr_sel;
+}
+
+static void kdd_get_ctrl_x86_64(struct hvm_hw_cpu *cpu,
+ struct hvm_hw_lapic_regs *lapic,
+ kdd_ctrl_x86_64 *c)
+{
+ c->cr0 = cpu->cr0;
+ c->cr2 = cpu->cr2;
+ c->cr3 = cpu->cr3;
+ c->cr4 = cpu->cr4;
+ c->dr0 = cpu->dr0;
+ c->dr1 = cpu->dr1;
+ c->dr2 = cpu->dr2;
+ c->dr3 = cpu->dr3;
+ c->dr6 = cpu->dr6;
+ c->dr7 = cpu->dr7;
+ c->gdt_base = cpu->gdtr_base;
+ c->gdt_limit = cpu->gdtr_limit;
+ c->idt_base = cpu->idtr_base;
+ c->idt_limit = cpu->idtr_limit;
+ c->tss_sel = cpu->tr_sel;
+ c->ldt_sel = cpu->ldtr_sel;
+ c->cr8 = lapic->data[0x80] >> 4; /* Top half of the low byte of the TPR */
+}
+
+
+int kdd_get_ctrl(kdd_guest *g, int cpuid, kdd_ctrl *ctrl, int w64)
+{
+ struct hvm_hw_cpu *cpu;
+ struct hvm_hw_lapic_regs *lapic;
+
+ cpu = get_cpu(g, cpuid);
+ if (!cpu)
+ return -1;
+
+ if (w64) {
+ lapic = get_lapic(g, cpuid);
+ if (!lapic)
+ return -1;
+ kdd_get_ctrl_x86_64(cpu, lapic, &ctrl->c64);
+ } else {
+ kdd_get_ctrl_x86_32(cpu, &ctrl->c32);
+ }
+
+ return 0;
+}
+
+int kdd_wrmsr(kdd_guest *g, int cpuid, uint32_t msr, uint64_t value)
+{
+ struct hvm_hw_cpu *cpu;
+
+ cpu = get_cpu(g, cpuid);
+ if (!cpu)
+ return -1;
+
+ switch (msr) {
+ case 0x00000174: cpu->sysenter_cs = value; break;
+ case 0x00000175: cpu->sysenter_esp = value; break;
+ case 0x00000176: cpu->sysenter_eip = value; break;
+ case 0xc0000080: cpu->msr_efer = value; break;
+ case 0xc0000081: cpu->msr_star = value; break;
+ case 0xc0000082: cpu->msr_lstar = value; break;
+ case 0xc0000083: cpu->msr_cstar = value; break;
+ case 0xc0000084: cpu->msr_syscall_mask = value; break;
+ case 0xc0000100: cpu->fs_base = value; break;
+ case 0xc0000101: cpu->gs_base = value; break;
+ case 0xc0000102: cpu->shadow_gs = value; break;
+ default:
+ return -1;
+ }
+
+ hvm_writeback(g);
+ return 0;
+}
+
+int kdd_rdmsr(kdd_guest *g, int cpuid, uint32_t msr, uint64_t *value)
+{
+ struct hvm_hw_cpu *cpu;
+
+ cpu = get_cpu(g, cpuid);
+ if (!cpu)
+ return -1;
+
+ switch (msr) {
+ case 0x00000174: *value = cpu->sysenter_cs; break;
+ case 0x00000175: *value = cpu->sysenter_esp; break;
+ case 0x00000176: *value = cpu->sysenter_eip; break;
+ case 0xc0000080: *value = cpu->msr_efer; break;
+ case 0xc0000081: *value = cpu->msr_star; break;
+ case 0xc0000082: *value = cpu->msr_lstar; break;
+ case 0xc0000083: *value = cpu->msr_cstar; break;
+ case 0xc0000084: *value = cpu->msr_syscall_mask; break;
+ case 0xc0000100: *value = cpu->fs_base; break;
+ case 0xc0000101: *value = cpu->gs_base; break;
+ case 0xc0000102: *value = cpu->shadow_gs; break;
+ default:
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/* Accessor for guest physical memory */
+static uint32_t kdd_access_physical_page(kdd_guest *g, uint64_t addr,
+ uint32_t len, uint8_t *buf, int write)
+{
+ uint32_t map_pfn, map_offset;
+ uint8_t *map;
+
+ map_pfn = (addr >> PAGE_SHIFT);
+ map_offset = addr & (PAGE_SIZE - 1);
+
+ /* Evict any mapping of the wrong frame from our slot */
+ if (g->pfns[map_pfn % MAPSIZE] != map_pfn
+ && g->maps[map_pfn % MAPSIZE] != NULL) {
+ munmap(g->maps[map_pfn % MAPSIZE], PAGE_SIZE);
+ g->maps[map_pfn % MAPSIZE] = NULL;
+ }
+ g->pfns[map_pfn % MAPSIZE] = map_pfn;
+
+ /* Now map the frame if it's not already there */
+ if (g->maps[map_pfn % MAPSIZE] != NULL)
+ map = g->maps[map_pfn % MAPSIZE];
+ else {
+ map = xc_map_foreign_range(g->xc_handle,
+ g->domid,
+ PAGE_SIZE,
+ PROT_READ|PROT_WRITE,
+ map_pfn);
+
+ KDD_DEBUG(g, "map: %u, 0x%16.16"PRIx32": %p +0x%"PRIx32"\n",
+ write ? PROT_READ|PROT_WRITE : PROT_READ,
+ map_pfn, map, map_offset);
+
+ if (!map)
+ return 0;
+ g->maps[map_pfn % MAPSIZE] = map;
+ }
+
+ if (write)
+ memcpy(map + map_offset, buf, len);
+ else
+ memcpy(buf, map + map_offset, len);
+
+ return len;
+}
+
+uint32_t kdd_access_physical(kdd_guest *g, uint64_t addr,
+ uint32_t len, uint8_t *buf, int write)
+{
+ uint32_t chunk, rv, done = 0;
+ while (len > 0) {
+ chunk = PAGE_SIZE - (addr & (PAGE_SIZE - 1));
+ if (chunk > len)
+ chunk = len;
+ rv = kdd_access_physical_page(g, addr, chunk, buf, write);
+ done += rv;
+ if (rv != chunk)
+ return done;
+ addr += chunk;
+ buf += chunk;
+ len -= chunk;
+ }
+ return done;
+}
+
+
+/* Plumb libxc log messages into our own logging */
+static void kdd_xc_log(struct xentoollog_logger *logger,
+ xentoollog_level level,
+ int errnoval /* or -1 */,
+ const char *context /* eg "xc", "xl", may be 0 */,
+ const char *format /* without level, context, \n */,
+ va_list al)
+{
+ kdd_guest *g = (kdd_guest *) logger;
+ /* Suppress most libxc levels unless we're logging at debug level */
+ if (g->verbosity < 1 || (level < XTL_WARN && g->verbosity < 3))
+ return;
+ fprintf(g->log, "libxc[%s:%i:%i]: ", context ? : "?", level, errnoval);
+ vfprintf(g->log, format, al);
+ fprintf(g->log, "\n");
+ (void) fflush(g->log);
+}
+
+
+/* Set up guest-specific state */
+kdd_guest *kdd_guest_init(char *arg, FILE *log, int verbosity)
+{
+ kdd_guest *g = NULL;
+ xc_interface *xch = NULL;
+ uint32_t domid;
+ xc_dominfo_t info;
+
+ g = calloc(1, sizeof (kdd_guest));
+ if (!g)
+ goto err;
+ g->log = log;
+ g->verbosity = verbosity;
+ g->xc_log.vmessage = kdd_xc_log;
+
+ xch = xc_interface_open(&g->xc_log, NULL, 0);
+ if (!xch)
+ goto err;
+ g->xc_handle = xch;
+
+ domid = strtoul(arg, NULL, 0);
+ if (domid == 0)
+ goto err;
+ g->domid = domid;
+
+ /* Check that the domain exists and is HVM */
+ if (xc_domain_getinfo(xch, domid, 1, &info) != 1 || !info.hvm)
+ goto err;
+
+ snprintf(g->id, (sizeof g->id) - 1,
+ "a xen guest with domain id %i", g->domid);
+
+ return g;
+
+ err:
+ free(g);
+ if (xch)
+ xc_interface_close(xch);
+ return NULL;
+}
+
+/* Say what kind of guest this is */
+char *kdd_guest_identify(kdd_guest *g)
+{
+ return g->id;
+}
+
+/* Tear down guest-specific state */
+void kdd_guest_teardown(kdd_guest *g)
+{
+ flush_maps(g);
+ xc_interface_close(g->xc_handle);
+ free(g->id);
+ free(g->hvm_buf);
+ free(g);
+}
diff -r ac7f64d5577b tools/debugger/kdd/kdd.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/debugger/kdd/kdd.c Mon Oct 25 15:12:21 2010 +0100
@@ -0,0 +1,1045 @@
+/*
+ * kdd.c -- stub for debugging guest OSes with the windows kernel debugger.
+ *
+ * Tim Deegan <Tim.Deegan@xxxxxxxxxx>
+ *
+ * Copyright (c) 2007-2010, Citrix Systems Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <ctype.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <err.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <netdb.h>
+
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/select.h>
+
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+
+#include "kdd.h"
+
+/* Windows version details */
+typedef struct {
+ uint32_t build;
+ int w64;
+ int mp;
+ char *name;
+ uint64_t base; /* KernBase: start looking here */
+ uint32_t range; /* | and search an area this size */
+ uint32_t version; /* +-> NtBuildNumber */
+ uint32_t modules; /* +-> PsLoadedModuleList */
+ uint32_t prcbs; /* +-> KiProcessorBlock */
+} kdd_os;
+
+/* State of the debugger stub */
+typedef struct {
+ union {
+ uint8_t txb[sizeof (kdd_hdr) + 65536]; /* Marshalling area for tx */
+ kdd_pkt txp; /* Also readable as a packet structure */
+ };
+ union {
+ uint8_t rxb[sizeof (kdd_hdr) + 65536]; /* Marshalling area for rx */
+ kdd_pkt rxp; /* Also readable as a packet structure */
+ };
+ unsigned int cur; /* Offset into rx where we'll put the next byte */
+ uint32_t next_id; /* ID of next packet we will send */
+ int running; /* Are the guest's processors active? */
+ int cpuid; /* Current selected CPU */
+ int fd; /* TCP socket for client comms */
+ FILE *log; /* For tracing output */
+ int verbosity; /* How much detail to trace */
+ kdd_guest *guest; /* Arch-specific state for guest control */
+ kdd_os os; /* OS-specific magic numbers */
+} kdd_state;
+
+/*****************************************************************************
+ * Utility functions
+ */
+
+/* Get the instruction pointer */
+static uint64_t kdd_get_ip(kdd_state *s)
+{
+ kdd_regs r;
+ if (!s->os.w64 && kdd_get_regs(s->guest, s->cpuid, &r, 0) == 0)
+ return r.r32.eip;
+ else if (s->os.w64 && kdd_get_regs(s->guest, s->cpuid, &r, 1) == 0)
+ return r.r64.rip;
+ else
+ return -1ULL;
+}
+
+/* Turn write(2) into a proper blocking write. */
+static size_t blocking_write(int fd, const void *buf, size_t count)
+{
+ size_t left = count;
+ ssize_t r;
+ while (left > 0 && ((r = write(fd, buf, left)) >= 0 || errno == EINTR)) {
+ buf += r;
+ left -= r;
+ }
+ return count - left;
+}
+
+/* Dump the contents of a complete serial packet into a log file. */
+static void kdd_log_pkt(kdd_state *s, char *name, kdd_pkt *p)
+{
+ uint32_t sum = 0;
+ unsigned int i, j;
+ uint8_t ascii[17] = {0};
+ FILE *f = s->log;
+
+ if (s->verbosity < 2)
+ return;
+
+ /* Re-check the checksum */
+ for (i = 0; i < p->h.len; i++)
+ sum += p->payload[i];
+
+ fprintf(f, "\n"
+ "%s: %s type 0x%4.4"PRIx16" len 0x%4.4"PRIx16
+ " id 0x%8.8"PRIx32" sum 0x%"PRIx32" (%s: 0x%"PRIx32")\n",
+ name,
+ p->h.dir == KDD_DIR_PKT ? "pkt" :
+ p->h.dir == KDD_DIR_ACK ? "ack" : "???",
+ (unsigned) p->h.type, p->h.len, p->h.id, p->h.sum,
+ sum == p->h.sum ? "OK" : "BAD", sum);
+
+ /* Hexdump the payload in "canonical" format*/
+ for (i = 0; i < p->h.len; i ++) {
+ if (i % 16 == 0) {
+ memset(ascii, 0, 17);
+ fprintf(f, "%8.8x ", i);
+ } else if (i % 8 == 0)
+ fprintf(f, " ");
+ fprintf(f, " %2.2x", p->payload[i]);
+ ascii[i % 16] = (isprint(((int)p->payload[i])) ? p->payload[i] : 0x2e);
+ if (i % 16 == 15)
+ fprintf(f, " |%s|\n", ascii);
+ }
+ if (i % 16 != 0) {
+ for (j = i % 16 ; j < 16; j++) {
+ fprintf(f, "%s", (j == 8) ? " " : " ");
+ }
+ fprintf(f, " |%s|\n%8.8x\n", ascii, i);
+ }
+
+ fprintf(f, "\n");
+ (void) fflush(f);
+}
+
+
+/*****************************************************************************
+ * Memory access: virtual addresses and syntactic sugar.
+ */
+
+#define PAGE_SHIFT (12)
+#define PAGE_SIZE (1ULL << PAGE_SHIFT)
+
+static uint32_t kdd_read_physical(kdd_state *s, uint64_t addr,
+ uint32_t len, void *buf)
+{
+ return kdd_access_physical(s->guest, addr, len, buf, 0);
+}
+
+static uint32_t kdd_write_physical(kdd_state *s, uint64_t addr,
+ uint32_t len, void *buf)
+{
+ return kdd_access_physical(s->guest, addr, len, buf, 1);
+}
+
+
+/* VA->PA conversion. Returns -1ULL for failure. */
+static uint64_t v2p(kdd_state *s, int cpuid, uint64_t va)
+{
+ int pg, pae, pse, lma;
+ int levels, width, bits, shift, offset, i;
+ uint64_t efer, entry = 0, mask, pa;
+ kdd_ctrl ctrl;
+
+ if (kdd_get_ctrl(s->guest, cpuid, &ctrl, s->os.w64) != 0
+ || kdd_rdmsr(s->guest, cpuid, 0xc0000080, &efer) != 0)
+ return -1ULL;
+
+ if (s->os.w64) {
+ pg = !!(ctrl.c64.cr0 & 0x80000000);
+ lma = !!(efer & 0x00000400);
+ pae = !!(ctrl.c64.cr4 & 0x00000020);
+ pse = !!(ctrl.c64.cr4 & 0x00000010) || pae || lma;
+ pa = ctrl.c64.cr3 & ~0x0fULL;
+ } else {
+ pg = !!(ctrl.c32.cr0 & 0x80000000);
+ pae = !!(ctrl.c32.cr4 & 0x00000020);
+ lma = 0;
+ pse = !!(ctrl.c32.cr4 & 0x00000010) || pae;
+ pa = ctrl.c32.cr3 & ~0x0fULL;
+ }
+ KDD_DEBUG(s, "w64 = %u, pg = %u, pae = %u, pse = %u, lma = %u\n",
+ s->os.w64, pg, pae, pse, lma);
+
+ /* Paging disabled? */
+ if (!pg)
+ return va;
+
+ /* 32/PAE64? */
+ if (lma) {
+ va &= (1ULL<<48) - 1;
+ width = 8; levels = 4; bits = 9;
+ } else {
+ va &= (1ULL<<32) - 1;
+ if (pae) {
+ width = 8; levels = 3; bits = 9;
+ } else {
+ width = 4; levels = 2; bits = 10;
+ }
+ }
+ KDD_DEBUG(s, "%i levels, va 0x%16.16"PRIx64"\n", levels, va);
+
+ /* Walk the appropriate number of levels */
+ for (i = levels; i > 0; i--) {
+ shift = PAGE_SHIFT + bits * (i-1);
+ mask = ((1ULL << bits) - 1) << shift;
+ offset = ((va & mask) >> shift) * width;
+ KDD_DEBUG(s, "level %i: mask 0x%16.16"PRIx64" pa 0x%16.16"PRIx64
+ " offset %i\n",i, mask, pa, offset);
+ if (kdd_read_physical(s, pa + offset, width, &entry) != width)
+ return -1ULL; // Bad entry PA
+ KDD_DEBUG(s, "level %i: entry 0x%16.16"PRIx64"\n", i, entry);
+ if (!(entry & 0x1))
+ return -1ULL; // Not present
+ pa = entry & 0x000ffffffffff000ULL;
+ if (pse && (i == 2) && (entry & 0x80)) { // Superpage
+ mask = ((1ULL << (PAGE_SHIFT + bits)) - 1);
+ return (pa & ~mask) + (va & mask);
+ }
+ }
+
+ return pa + (va & (PAGE_SIZE - 1));
+}
+
+static uint32_t kdd_access_virtual(kdd_state *s, int cpuid, uint64_t addr,
+ uint32_t len, void *buf, int write)
+{
+ uint64_t pa;
+ uint32_t chunk, rv, done = 0;
+
+ /* Process one page at a time */
+ while (len > 0) {
+ chunk = PAGE_SIZE - (addr & (PAGE_SIZE - 1));
+ if (chunk > len)
+ chunk = len;
+ pa = v2p(s, cpuid, addr);
+ KDD_DEBUG(s, "va 0x%"PRIx64" -> pa 0x%"PRIx64"\n", addr, pa);
+ if (pa == (uint64_t) -1ULL)
+ return done;
+ rv = kdd_access_physical(s->guest, pa, chunk, buf, write);
+ done += rv;
+ if (rv != chunk)
+ return done;
+ addr += chunk;
+ buf += chunk;
+ len -= chunk;
+ }
+ return done;
+}
+
+static uint32_t kdd_read_virtual(kdd_state *s, int cpuid, uint64_t addr,
+ uint32_t len, void *buf)
+{
+ return kdd_access_virtual(s, cpuid, addr, len, buf, 0);
+}
+
+static uint32_t kdd_write_virtual(kdd_state *s, int cpuid, uint64_t addr,
+ uint32_t len, void *buf)
+{
+ return kdd_access_virtual(s, cpuid, addr, len, buf, 1);
+}
+
+
+/*****************************************************************************
+ * Version information and related runes for different Windows flavours
+ */
+
+static kdd_os os[] = {
+ /* Build 64 MP Name &Kernel search base Range
+Version +Modules +PRCBs (64b) */
+ {2195, 0, 0, "w2k sp4 x32 UP", 0xffffffff80400000ULL, 0x00000000,
0x0006d57c, 0x0006e1b8, 0x0},
+ {2195, 0, 1, "w2k sp4 x32 SMP", 0xffffffff80400000ULL, 0x00000000,
0x0006fa1c, 0x00084520, 0x0},
+ // PAE/UP, PAE/SMP
+
+ {2600, 0, 0, "xp sp2 x32 UP", 0xffffffff804d7000ULL, 0x00000000,
0x00075568, 0x00083b20, 0x0},
+ {2600, 0, 1, "xp sp2 x32 SMP", 0xffffffff804d7000ULL, 0x00000000,
0x0007d0e8, 0x0008d4a0, 0x0},
+ // PAE/UP, PAE/SMP
+
+ {2600, 0, 0, "xp sp3 x32 UP", 0xffffffff804d7000ULL, 0x00000000,
0x00075be8, 0x000841c0, 0x0},
+ {2600, 0, 1, "xp sp3 x32 SMP", 0xffffffff804d7000ULL, 0x00000000,
0x0007c0e8, 0x0008c4c0, 0x0},
+ {2600, 0, 0, "xp sp3 x32p UP", 0xffffffff804d7000ULL, 0x00000000,
0x0006e8e8, 0x0007cfc0, 0x0},
+ {2600, 0, 1, "xp sp3 x32p SMP", 0xffffffff804d7000ULL, 0x00000000,
0x000760e8, 0x00086720, 0x0},
+
+ {3790, 0, 0, "w2k3 sp2 x32 UP", 0xffffffff80800000ULL, 0x00000000,
0x00097128, 0x000a8e48, 0x0},
+ {3790, 0, 1, "w2k3 sp2 x32 SMP", 0xffffffff80800000ULL, 0x00000000,
0x0009d128, 0x000af9c8, 0x0},
+ {3790, 0, 0, "w2k3 sp2 x32p UP", 0xffffffff80800000ULL, 0x00000000,
0x0008e128, 0x0009ffa8, 0x0},
+ {3790, 0, 1, "w2k3 sp2 x32p SMP", 0xffffffff80800000ULL, 0x00000000,
0x00094128, 0x000a6ea8, 0x0},
+ {3790, 1, 0, "w2k3 sp2 x64 UP", 0xfffff80001000000ULL, 0x00000000,
0x001765d0, 0x0019aae0, 0x0017b100},
+ {3790, 1, 1, "w2k3 sp2 x64 SMP", 0xfffff80001000000ULL, 0x00000000,
0x001b05e0, 0x001d5100, 0x001b5300},
+
+ {6000, 0, 1, "vista sp0 x32p", 0xffffffff81800000ULL, 0x00000000,
0x000a4de4, 0x00111db0, 0x0},
+ {6001, 0, 1, "vista sp1 x32p", 0xffffffff81000000ULL, 0x0f000000,
0x000af0c4, 0x00117c70, 0x0},
+
+ {6001, 1, 1, "w2k8 sp0 x64", 0xfffff80001000000ULL, 0x0f000000,
0x00140bf0, 0x001c5db0, 0x00229640},
+
+ {7600, 1, 1, "win7 sp0 x64", 0xfffff80001000000ULL, 0x0f000000,
0x001af770, 0x0023de50, 0x002a8900},
+
+ {7601, 0, 1, "win7 sp1 x32p", 0xffffffff81800000ULL, 0x0f000000,
0x000524c4, 0x00149850, 0x0},
+ {7601, 1, 1, "win7 sp1 x64", 0xfffff80001000000ULL, 0x0f000000,
0x001b2770, 0x00240e90, 0x002ab900},
+};
+
+// 1381, 0, 0, "NT4 sp?", 0xffffffff80100000, ?, ?
+
+static kdd_os unknown_os = {0, 0, 0, "unknown OS", 0, 0, 0, 0, 0};
+
+static int check_os(kdd_state *s)
+{
+ kdd_os *v = &s->os;
+ uint64_t addr, val;
+ uint32_t width;
+ int i;
+
+ /* Kernel address must be a DOS executable */
+ val = 0;
+ if (kdd_read_virtual(s, 0, v->base, 2, &val) != 2 || val != 0x5a4d) {
+ KDD_DEBUG(s, "not %s: krnl 0x%"PRIx64"\n", v->name, val);
+ return 0;
+ }
+
+ /* OS version must match. */
+ val = 0;
+ if (kdd_read_virtual(s, 0, v->base + v->version, 4, &val) != 4
+ || val != (v->build | 0xf0000000) ) {
+ KDD_DEBUG(s, "not %s: version 0x%"PRIx64"\n", v->name, val);
+ return 0;
+ }
+
+ /* Module list address must be a circular linked list */
+ addr = v->base + v->modules;
+ val = 0;
+ width = v->w64 ? 8 : 4;
+ for (i = 0; val != v->base + v->modules && i < 250; i++) {
+ val = 0;
+ if (kdd_read_virtual(s, 0, addr, width, &val) != width) {
+ KDD_DEBUG(s, "not %s: bad module list\n", v->name);
+ return 0;
+ }
+ addr = val;
+ }
+
+ return 1;
+}
+
+/* Figure out what OS we're dealing with */
+static void find_os(kdd_state *s)
+{
+ int i;
+ uint64_t limit;
+
+ /* We may already have the right one */
+ if (check_os(s))
+ return;
+
+ /* Try each OS we know about */
+ for (i = 0; i < (sizeof os / sizeof os[0]); i++) {
+ s->os = os[i];
+ /* Try each page in the potential range of kernel load addresses */
+ for (limit = s->os.base + s->os.range;
+ s->os.base <= limit;
+ s->os.base += PAGE_SIZE)
+ if (check_os(s))
+ return;
+ }
+ s->os = unknown_os;
+}
+
+
+/*****************************************************************************
+ * How to send packets and acks.
+ */
+
+
+/* Send a serial packet */
+static void kdd_tx(kdd_state *s)
+{
+ uint32_t sum = 0;
+ size_t len;
+ int i;
+
+ /* Fix up the checksum before we send */
+ for (i = 0; i < s->txp.h.len; i++)
+ sum += s->txp.payload[i];
+ s->txp.h.sum = sum;
+
+ kdd_log_pkt(s, "TX", &s->txp);
+
+ len = s->txp.h.len + sizeof (kdd_hdr);
+ if (s->txp.h.dir == KDD_DIR_PKT)
+ /* Append the mysterious 0xaa byte to each packet */
+ s->txb[len++] = 0xaa;
+
+ (void) blocking_write(s->fd, s->txb, len);
+}
+
+
+/* Send an acknowledgement to the client */
+static void kdd_send_ack(kdd_state *s, uint32_t id, uint16_t type)
+{
+ s->txp.h.dir = KDD_DIR_ACK;
+ s->txp.h.type = type;
+ s->txp.h.len = 0;
+ s->txp.h.id = id;
+ s->txp.h.sum = 0;
+ kdd_tx(s);
+}
+
+/* Send a command_packet to the client */
+static void kdd_send_cmd(kdd_state *s, uint32_t subtype, size_t extra)
+{
+ s->txp.h.dir = KDD_DIR_PKT;
+ s->txp.h.type = KDD_PKT_CMD;
+ s->txp.h.len = sizeof (kdd_cmd) + extra;
+ s->txp.h.id = (s->next_id ^= 1);
+ s->txp.h.sum = 0;
+ s->txp.cmd.subtype = subtype;
+ kdd_tx(s);
+}
+
+/* Cause the client to print a string */
+static void kdd_send_string(kdd_state *s, char *fmt, ...)
+{
+ uint32_t len = 0xffff - sizeof (kdd_msg);
+ char *buf = (char *) s->txb + sizeof (kdd_hdr) + sizeof (kdd_msg);
+ va_list ap;
+
+ va_start(ap, fmt);
+ len = vsnprintf(buf, len, fmt, ap);
+ va_end(ap);
+
+ s->txp.h.dir = KDD_DIR_PKT;
+ s->txp.h.type = KDD_PKT_MSG;
+ s->txp.h.len = sizeof (kdd_msg) + len;
+ s->txp.h.id = (s->next_id ^= 1);
+ s->txp.h.sum = 0;
+ s->txp.msg.subtype = KDD_MSG_PRINT;
+ s->txp.msg.length = len;
+ kdd_tx(s);
+}
+
+
+/* Stop the guest and prepare for debugging */
+static void kdd_break(kdd_state *s)
+{
+ uint16_t ilen;
+ KDD_LOG(s, "Break\n");
+
+ if (s->running)
+ kdd_halt(s->guest);
+ s->running = 0;
+
+ {
+ unsigned int i;
+ /* XXX debug pattern */
+ for (i = 0; i < 0x100 ; i++)
+ s->txb[sizeof (kdd_hdr) + i] = i;
+ }
+
+ /* Send a state-change message to the client so it knows we've stopped */
+ s->txp.h.dir = KDD_DIR_PKT;
+ s->txp.h.type = KDD_PKT_STC;
+ s->txp.h.len = sizeof (kdd_stc);
+ s->txp.h.id = (s->next_id ^= 1);
+ s->txp.stc.subtype = KDD_STC_STOP;
+ s->txp.stc.stop.cpu = s->cpuid;
+ s->txp.stc.stop.ncpus = kdd_count_cpus(s->guest);
+ s->txp.stc.stop.kthread = 0; /* Let the debugger figure it out */
+ s->txp.stc.stop.status = KDD_STC_STATUS_BREAKPOINT;
+ s->txp.stc.stop.rip1 = s->txp.stc.stop.rip2 = kdd_get_ip(s);
+ s->txp.stc.stop.nparams = 0;
+ s->txp.stc.stop.first_chance = 1;
+ ilen = kdd_read_virtual(s, s->cpuid, s->txp.stc.stop.rip1,
+ sizeof s->txp.stc.stop.inst, s->txp.stc.stop.inst);
+ s->txp.stc.stop.ilen = ilen;
+ /* XXX other fields */
+
+ kdd_tx(s);
+}
+
+/* Handle an acknowledgement received from the client */
+static void kdd_handle_ack(kdd_state *s, uint32_t id, uint16_t type)
+{
+ switch (type) {
+ case KDD_ACK_OK:
+ case KDD_ACK_BAD:
+ break;
+ case KDD_ACK_RST:
+ if (id == 0) {
+ KDD_LOG(s, "Client requests a reset\n");
+ kdd_send_ack(s, 0xdeadbeef, KDD_ACK_RST);
+ kdd_send_string(s, "[kdd: connected to %s]\r\n",
+ kdd_guest_identify(s->guest));
+ kdd_break(s);
+ }
+ break;
+ default:
+ KDD_LOG(s, "Unhandled ACK type 0x%4.4x\n", type);
+ break;
+ }
+}
+
+/*****************************************************************************
+ * Handlers for each kind of client packet
+ */
+
+
+/* Handle the initial handshake */
+static void kdd_handle_handshake(kdd_state *s)
+{
+ /* Figure out what we're looking at */
+ find_os(s);
+ kdd_send_string(s, "[kdd: %s @0x%"PRIx64"]\r\n", s->os.name, s->os.base);
+
+ /* Respond with some details about the debugger stub we simulate */
+ s->txp.cmd.shake.u1 = 0x01010101;
+ s->txp.cmd.shake.status = KDD_STATUS_SUCCESS;
+ s->txp.cmd.shake.u2 = 0x02020202;
+ s->txp.cmd.shake.v_major = 0xf;
+ s->txp.cmd.shake.v_minor = s->os.build;
+ s->txp.cmd.shake.proto = 6;
+ s->txp.cmd.shake.flags = (0x02 /* ??? */
+ | (s->os.mp ? KDD_FLAGS_MP : 0)
+ | (s->os.w64 ? KDD_FLAGS_64 : 0));
+ s->txp.cmd.shake.machine = s->os.w64 ? KDD_MACH_x64 : KDD_MACH_x32;
+ s->txp.cmd.shake.pkts = KDD_PKT_MAX;
+ s->txp.cmd.shake.states = 0xc; /* ??? */
+ s->txp.cmd.shake.manips = 0x2e; /* ??? */
+ s->txp.cmd.shake.u3[0] = 0x33;
+ s->txp.cmd.shake.u3[1] = 0x44;
+ s->txp.cmd.shake.u3[2] = 0x55;
+ s->txp.cmd.shake.kern_addr = s->os.base;
+ s->txp.cmd.shake.mods_addr = s->os.base + s->os.modules;
+ s->txp.cmd.shake.data_addr = 0; /* Debugger data probably doesn't exist */
+
+ KDD_LOG(s, "Client initial handshake: %s\n", s->os.name);
+ kdd_send_cmd(s, KDD_CMD_SHAKE, 0);
+}
+
+/* Handle set-cpu command */
+static void kdd_handle_setcpu(kdd_state *s)
+{
+ KDD_LOG(s, "Switch to CPU %u\n", s->rxp.cmd.setcpu.cpu);
+
+ /* This command doesn't get a direct response; instead we send a STOP. */
+ s->cpuid = s->rxp.cmd.setcpu.cpu;
+ kdd_break(s);
+
+ /* XXX find out whether kd will be happier if we respond to this command
after the break. */
+}
+
+/* Handle breakpoint commands */
+static void kdd_handle_soft_breakpoint(kdd_state *s)
+{
+ KDD_LOG(s, "Soft breakpoint %#"PRIx32" op %#"PRIx32"/%#"PRIx32"\n",
+ s->rxp.cmd.sbp.bp, s->rxp.cmd.sbp.u1, s->rxp.cmd.sbp.u2);
+
+ /* Pretend we did something */
+ s->txp.cmd.sbp.u1 = s->rxp.cmd.sbp.u1;
+ s->txp.cmd.sbp.status = KDD_STATUS_SUCCESS;
+ s->txp.cmd.sbp.u2 = s->rxp.cmd.sbp.u2;
+ s->txp.cmd.sbp.bp = s->rxp.cmd.sbp.bp;
+ kdd_send_cmd(s, KDD_CMD_SOFT_BP, 0);
+}
+
+static void kdd_handle_hard_breakpoint(kdd_state *s)
+{
+ KDD_LOG(s, "Hard breakpoint @%#"PRIx64"\n", s->rxp.cmd.hbp.address);
+
+ kdd_send_string(s, "[kdd: breakpoints aren't implemented yet]\r\n");
+
+ s->txp.cmd.hbp.status = KDD_STATUS_FAILURE;
+ s->txp.cmd.hbp.address = s->rxp.cmd.hbp.address;
+ kdd_send_cmd(s, KDD_CMD_HARD_BP, 0);
+}
+
+/* Register access */
+static void kdd_handle_read_regs(kdd_state *s)
+{
+ kdd_regs regs;
+ uint32_t len = s->os.w64 ? sizeof regs.r64 : sizeof regs.r32;
+ int cpuid = s->rxp.cmd.regs.cpu;
+
+ KDD_LOG(s, "Read CPU %i register state\n", cpuid);
+ if (kdd_get_regs(s->guest, cpuid, ®s, s->os.w64) == 0) {
+ memcpy(s->txb + sizeof (kdd_hdr) + sizeof (kdd_cmd), ®s, len);
+ s->txp.cmd.regs.status = KDD_STATUS_SUCCESS;
+ } else {
+ len = 0;
+ s->txp.cmd.regs.status = KDD_STATUS_FAILURE;
+ }
+ s->txp.cmd.regs.cpu = cpuid;
+ kdd_send_cmd(s, KDD_CMD_READ_REGS, len);
+}
+
+static void kdd_handle_write_regs(kdd_state *s)
+{
+ kdd_regs regs;
+ uint32_t len = s->rxp.h.len - sizeof (kdd_cmd);
+ uint32_t regsz = s->os.w64 ? sizeof regs.r64 : sizeof regs.r32;
+ int cpuid = s->rxp.cmd.regs.cpu;
+
+ KDD_LOG(s, "Write CPU %i register state\n", cpuid);
+ s->txp.cmd.regs.status = KDD_STATUS_FAILURE;
+ if (len >= regsz) {
+ memcpy(®s, s->rxb + sizeof (kdd_hdr) + sizeof (kdd_cmd), regsz);
+ if (kdd_set_regs(s->guest, cpuid, ®s, s->os.w64) == 0)
+ s->txp.cmd.regs.status = KDD_STATUS_SUCCESS;
+ }
+ s->txp.cmd.regs.cpu = cpuid;
+ kdd_send_cmd(s, KDD_CMD_WRITE_REGS, 0);
+}
+
+/* Report control state to the guest */
+static void kdd_handle_read_ctrl(kdd_state *s)
+{
+ int i;
+ kdd_ctrl ctrl;
+ uint8_t *buf = s->txb + sizeof (kdd_hdr) + sizeof (kdd_cmd);
+ uint32_t len = s->rxp.cmd.mem.length_req;
+ uint64_t val, addr = s->rxp.cmd.mem.addr;
+ KDD_LOG(s, "Read control state: %"PRIu32" bytes @ 0x%"PRIx64"\n",
+ len, addr);
+
+ if (len > (65536 - sizeof(kdd_cmd)))
+ len = 65536 - sizeof(kdd_cmd);
+
+ /* Default contents: a debug-friendly pattern */
+ for (i = 0; i < len; i++)
+ ((uint8_t*)buf)[i] = (uint8_t) (addr + i);
+
+ if (kdd_get_ctrl(s->guest, s->cpuid, &ctrl, s->os.w64)) {
+ len = 0;
+ } else if (s->os.w64) {
+ /* Annoyingly, 64-bit kd relies on the kernel to point it at
+ * datastructures it could easily find itself with VA reads. */
+ switch (addr) {
+ case 0x0: /* KPCR */
+ case 0x1: /* KPRCB */
+ case 0x3: /* KTHREAD */
+ /* First find the PCRB's address */
+ len = kdd_read_virtual(s, s->cpuid,
+ s->os.base + s->os.prcbs + 8 * s->cpuid,
+ 8, &val);
+ if (len != 8)
+ break;
+ /* The PCR lives 0x180 bytes before the PRCB */
+ if (addr == 0)
+ val -= 0x180;
+ /* The current thread's address is at offset 0x8 into the PRCB. */
+ else if (addr == 3)
+ len = kdd_read_virtual(s, s->cpuid, val + 8, 8, &val);
+ *(uint64_t *)buf = val;
+ break;
+ case 0x2: /* Control registers */
+ if (len > sizeof ctrl.c64)
+ len = sizeof ctrl.c64;
+ memcpy(buf, (uint8_t *)&ctrl, len);
+ break;
+ default:
+ KDD_LOG(s, "Unknown control space 0x%"PRIx64"\n", addr);
+ len = 0;
+ }
+ } else {
+ /* 32-bit control-register space starts at 0x[2]cc, for 84 bytes */
+ uint64_t offset = addr;
+ if (offset > 0x200)
+ offset -= 0x200;
+ offset -= 0xcc;
+ if (offset > sizeof ctrl.c32 || offset + len > sizeof ctrl.c32) {
+ KDD_LOG(s, "Request outside of known control space\n");
+ len = 0;
+ } else {
+ memcpy(buf, ((uint8_t *)&ctrl.c32) + offset, len);
+ }
+ }
+
+ s->txp.cmd.mem.addr = addr;
+ s->txp.cmd.mem.length_req = s->rxp.cmd.mem.length_req;
+ s->txp.cmd.mem.length_rsp = len;
+ s->txp.cmd.mem.status = ((len) ? KDD_STATUS_SUCCESS : KDD_STATUS_FAILURE);
+ kdd_send_cmd(s, KDD_CMD_READ_CTRL, len);
+}
+
+/* MSR access */
+static void kdd_handle_read_msr(kdd_state *s)
+{
+ uint32_t msr = s->rxp.cmd.msr.msr;
+ int ok;
+ KDD_LOG(s, "Read MSR 0x%"PRIx32"\n", msr);
+
+ ok = (kdd_rdmsr(s->guest, s->cpuid, msr, &s->txp.cmd.msr.val) == 0);
+ s->txp.cmd.msr.msr = msr;
+ s->txp.cmd.msr.status = (ok ? KDD_STATUS_SUCCESS : KDD_STATUS_FAILURE);
+ kdd_send_cmd(s, KDD_CMD_READ_MSR, 0);
+}
+
+static void kdd_handle_write_msr(kdd_state *s)
+{
+ uint32_t msr = s->rxp.cmd.msr.msr;
+ uint64_t val = s->rxp.cmd.msr.val;
+ int ok;
+ KDD_LOG(s, "Write MSR 0x%"PRIx32" = 0x%"PRIx64"\n", msr, val);
+
+ ok = (kdd_wrmsr(s->guest, s->cpuid, msr, val) == 0);
+ s->txp.cmd.msr.msr = msr;
+ s->txp.cmd.msr.status = (ok ? KDD_STATUS_SUCCESS : KDD_STATUS_FAILURE);
+ kdd_send_cmd(s, KDD_CMD_WRITE_MSR, 0);
+}
+
+/* Read and write guest memory */
+static void kdd_handle_memory_access(kdd_state *s)
+{
+ uint32_t len = s->rxp.cmd.mem.length_req;
+ uint64_t addr = s->rxp.cmd.mem.addr;
+ uint8_t *buf;
+
+ KDD_LOG(s, "Memory access \"%c%c\" (%s): %"PRIu32" bytes"
+ " @ 0x%"PRIx64"\n",
+ s->rxp.cmd.subtype & 0xff, (s->rxp.cmd.subtype >>8) & 0xff,
+ s->rxp.cmd.subtype == KDD_CMD_READ_VA ? "read virt" :
+ s->rxp.cmd.subtype == KDD_CMD_WRITE_VA ? "write virt" :
+ s->rxp.cmd.subtype == KDD_CMD_READ_PA ? "read phys" :
+ s->rxp.cmd.subtype == KDD_CMD_WRITE_PA ? "write phys" : "unknown",
+ len, addr);
+
+ if (len > (65536 - sizeof(kdd_cmd)))
+ len = 65536 - sizeof(kdd_cmd);
+
+ switch(s->rxp.cmd.subtype) {
+ case KDD_CMD_READ_VA:
+ buf = s->txb + sizeof (kdd_hdr) + sizeof (kdd_cmd);
+ len = kdd_read_virtual(s, s->cpuid, addr, len, buf);
+ break;
+ case KDD_CMD_WRITE_VA:
+ buf = s->rxb + sizeof (kdd_hdr) + sizeof (kdd_cmd);
+ len = kdd_write_virtual(s, s->cpuid, addr, len, buf);
+ break;
+ case KDD_CMD_READ_PA:
+ buf = s->txb + sizeof (kdd_hdr) + sizeof (kdd_cmd);
+ len = kdd_read_physical(s, addr, len, buf);
+ break;
+ case KDD_CMD_WRITE_PA:
+ buf = s->rxb + sizeof (kdd_hdr) + sizeof (kdd_cmd);
+ len = kdd_write_physical(s, addr, len, buf);
+ break;
+ }
+ KDD_DEBUG(s, "access returned %"PRIu32"\n", len);
+
+ s->txp.cmd.mem.addr = addr;
+ s->txp.cmd.mem.length_req = s->rxp.cmd.mem.length_req;
+ s->txp.cmd.mem.length_rsp = len;
+ s->txp.cmd.mem.status = (len) ? KDD_STATUS_SUCCESS : KDD_STATUS_FAILURE;
+ kdd_send_cmd(s, s->rxp.cmd.subtype, len);
+}
+
+
+/* Handle a packet received from the client */
+static void kdd_handle_pkt(kdd_state *s, kdd_pkt *p)
+{
+ uint32_t sum = 0;
+ int i;
+
+ /* Simple checksum: add all the bytes */
+ for (i = 0; i < p->h.len; i++)
+ sum += p->payload[i];
+ if (p->h.sum != sum) {
+ kdd_send_ack(s, p->h.id, KDD_ACK_BAD);
+ return;
+ }
+
+ /* We only understand one kind of packet from the client */
+ if (p->h.type != KDD_PKT_CMD) {
+ KDD_LOG(s, "Unhandled PKT type 0x%4.4x\n", p->h.type);
+ kdd_send_ack(s, p->h.id, KDD_ACK_BAD);
+ return;
+ }
+
+ /* Ack the packet */
+ kdd_send_ack(s, p->h.id, KDD_ACK_OK);
+
+ /* Clear the TX buffer just for sanity */
+ memset(s->txb, 0, sizeof(s->txb));
+
+ switch (p->cmd.subtype) {
+ case KDD_CMD_CONT1:
+ case KDD_CMD_CONT2:
+ KDD_LOG(s, "Continue: 0x%8.8"PRIx32"\n", p->cmd.cont.reason1);
+ if (!s->running)
+ kdd_run(s->guest);
+ s->running = 1;
+ /* No reply, just carry on running */
+ break;
+ case KDD_CMD_SHAKE:
+ kdd_handle_handshake(s);
+ break;
+ case KDD_CMD_SOFT_BP:
+ kdd_handle_soft_breakpoint(s);
+ break;
+ case KDD_CMD_HARD_BP:
+ kdd_handle_hard_breakpoint(s);
+ break;
+ case KDD_CMD_READ_REGS:
+ kdd_handle_read_regs(s);
+ break;
+ case KDD_CMD_WRITE_REGS:
+ kdd_handle_write_regs(s);
+ break;
+ case KDD_CMD_READ_CTRL:
+ kdd_handle_read_ctrl(s);
+ break;
+ case KDD_CMD_READ_MSR:
+ kdd_handle_read_msr(s);
+ break;
+ case KDD_CMD_WRITE_MSR:
+ kdd_handle_write_msr(s);
+ break;
+ case KDD_CMD_READ_VA:
+ case KDD_CMD_WRITE_VA:
+ case KDD_CMD_READ_PA:
+ case KDD_CMD_WRITE_PA:
+ kdd_handle_memory_access(s);
+ break;
+ case KDD_CMD_WRITE_Z:
+ /* No response */
+ break;
+ case KDD_CMD_SETCPU:
+ kdd_handle_setcpu(s);
+ break;
+ case KDD_CMD_WRITE_CTRL:
+ default:
+ KDD_LOG(s, "Unhandled CMD subtype 0x%8.8x\n", p->cmd.subtype);
+ /* Send back a mirror of the request saying we failed to do
+ * whatever it was. */
+ memcpy(s->txb, p, sizeof (kdd_hdr) + sizeof (kdd_cmd));
+ s->txp.h.len = sizeof (kdd_cmd);
+ s->txp.cmd.mem.status = KDD_STATUS_FAILURE;
+ s->txp.h.id = (s->next_id ^= 1);
+ kdd_tx(s);
+ break;
+ }
+}
+
+
+/*****************************************************************************
+ * Scaffolding to get packets from the client.
+ */
+
+
+/* Set up the debugger state ready for use. Returns a file descriptor and
+ * a state pointer for use in select() loops. */
+static int kdd_init(kdd_state **sp, struct addrinfo *addr,
+ kdd_guest *guest, FILE *log, int verbosity)
+{
+ kdd_state *s = NULL;
+ int opt, fd = -1;
+
+ s = malloc(sizeof *s);
+ if (s == NULL) {
+ fprintf(stderr, "Could not allocate state for kdd: %s\n",
+ strerror(errno));
+ goto fail;
+ }
+ memset(s, 0, sizeof *s);
+ s->log = log;
+ s->verbosity = verbosity;
+
+ fd = socket(PF_INET, SOCK_STREAM, 0);
+ if (fd < 0) {
+ KDD_LOG(s, "Could not open a socket for kdd: %s\n",
+ strerror(errno));
+ goto fail;
+ }
+
+ /* Try to connect to the tcp/serial gateway. */
+ again:
+ if (connect(fd, addr->ai_addr, sizeof *addr) != 0) {
+ if (errno == EINTR)
+ goto again;
+ if (addr->ai_next) {
+ addr = addr->ai_next;
+ goto again;
+ }
+ KDD_LOG(s, "Could not connect TCP stream for kdd: %s\n",
+ strerror(errno));
+ goto fail;
+ }
+
+ opt = 1;
+ setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
+
+ s->next_id = 0x80800001;
+ s->fd = fd;
+ s->running = 1;
+ s->cpuid = 0;
+ s->guest = guest;
+ s->os = unknown_os;
+
+ *sp = s;
+ KDD_LOG(s, "KDD starts\n");
+
+ kdd_break(s);
+
+ return fd;
+
+ fail:
+ if (fd >= 0)
+ close(fd);
+ free(s);
+ return -1;
+}
+
+/* Callback when the fd is readable, to parse packet data from the byte
+ * stream. When a complete packet is seen, handle it. The packet can
+ * then be read in the marshalling buffer, but only until the next call
+ * to kdd_parse_byte(). */
+void kdd_select_callback(kdd_state *s)
+{
+ kdd_pkt *p = &s->rxp;
+ unsigned int pkt_len = (unsigned) -1;
+ ssize_t rc, to_read;
+
+ /* For easy parsing, read single bytes until we can check the packet
+ * length, then read in one go to the end. */
+ if (s->cur < 8
+ || (p->h.dir != KDD_DIR_PKT && p->h.dir != KDD_DIR_ACK))
+ to_read = 1;
+ else {
+ /* Extract payload length from the header */
+ pkt_len = p->h.len + sizeof (kdd_hdr);
+
+ /* For some reason, packets always have a trailing 0xAA byte */
+ if (p->h.dir == KDD_DIR_PKT)
+ pkt_len++;
+
+ to_read = pkt_len - s->cur;
+ }
+
+ rc = read(s->fd, s->rxb + s->cur, to_read);
+
+ KDD_DEBUG(s, "read(%i) returns %i\n", (int) to_read, (int) rc);
+
+ if (rc <= 0)
+ /* XXX ignoring failures for now */
+ return;
+
+ /* Break command comes as a single byte */
+ if (s->cur == 0 && s->rxb[0] == 'b') {
+ kdd_break(s);
+ return;
+ }
+
+ /* Remember the bytes we just read */
+ s->cur += rc;
+
+ /* Sync to packet start, which will be "0000" or "iiii" */
+ if (s->cur < 4)
+ return;
+ if (p->h.dir != KDD_DIR_PKT && p->h.dir != KDD_DIR_ACK) {
+ KDD_LOG(s, "Bad hdr 0x%8.8x: resyncing\n", p->h.dir);
+ memmove(s->rxb, s->rxb + 1, --s->cur);
+ return;
+ }
+
+ /* Process complete packets/acks */
+ if (s->cur >= pkt_len) {
+ kdd_log_pkt(s, "RX", p);
+ if (p->h.dir == KDD_DIR_PKT)
+ kdd_handle_pkt(s, p);
+ else
+ kdd_handle_ack(s, p->h.id, p->h.type);
+ s->cur = 0;
+ }
+}
+
+
+static void usage(void)
+{
+ fprintf(stderr,
+" usage: kdd [-v] <domid> <address> <port>\n"
+" \n"
+" Makes a TCP connection to <address>:<port> and speaks the kd serial\n"
+" protocol over it, to debug Xen domain <domid>.\n"
+" To connect a debugger, set up a Windows VM with it serial port confgured\n"
+" as \"serial='tcp:<address>:<port>,server,nodelay,nowait'\". Run\n"
+" windbg or kd in that VM, connecting to COM1; then run kdd.\n\n");
+ exit(1);
+}
+
+
+int main(int argc, char **argv)
+{
+ int fd;
+ int verbosity = 0;
+ kdd_state *s;
+ kdd_guest *g;
+ struct addrinfo *addr;
+ fd_set fds;
+
+ while (argc > 4)
+ if (!strcmp(argv[1], "-v")) {
+ verbosity++;
+ argc--;
+ argv++;
+ }
+
+ if (argc != 4
+ || !(g = kdd_guest_init(argv[1], stdout, verbosity))
+ || getaddrinfo(argv[2], argv[3], NULL, &addr) != 0
+ || (fd = kdd_init(&s, addr, g, stdout, verbosity)) < 0)
+ usage();
+
+ while (1) {
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+ if (select(fd + 1, &fds, NULL, NULL, NULL) > 0)
+ kdd_select_callback(s);
+ }
+
+ return 0;
+}
diff -r ac7f64d5577b tools/debugger/kdd/kdd.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/debugger/kdd/kdd.h Mon Oct 25 15:12:21 2010 +0100
@@ -0,0 +1,520 @@
+/*
+ * kdd.h -- Structures, constants and descriptions of the Windows
+ * kd serial debugger protocol, for the kdd debugging stub.
+ *
+ * Tim Deegan <Tim.Deegan@xxxxxxxxxx>
+ *
+ * Copyright (c) 2007-2010, Citrix Systems Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _KDD_H_
+#define _KDD_H_
+
+#include <stdint.h>
+
+#define PACKED __attribute__((packed))
+
+/*****************************************************************************
+ * Serial line protocol: Sender sends a 16-byte header with an optional
+ * payload following it. Receiver responds to each packet with an
+ * acknowledgment (16-byte header only).
+ *
+ * Packet headers start with ASCII "0000" and there is a trailing byte
+ * 0xAA after the (optional) payload. Ack headers start with ASCII
+ * "iiii"; no trailing byte). Each packet and ack has a major type in
+ * the packet header; for packets with payload, a minor type is encoded
+ * in ASCII in the first four bytes of the payload.
+ *
+ * Packet IDs seem to start at 0x80800000 and alternate between that and
+ * 0x80800001; not clear whether the client's ID is always the ID of the
+ * last packet from the kernel or whether they're just oscillating in
+ * phase. Either way there's clearly some state machine in the kernel
+ * that requires this exact behaviour from the client.
+ *
+ * All acks have length 0, id = id of the packet they ack.
+ */
+
+#define KDD_DIR_PKT 0x30303030 /* "0000" */
+#define KDD_DIR_ACK 0x69696969 /* "iiii" */
+
+typedef struct {
+ uint32_t dir; /* KDD_DIR_PKT or KDD_DIR_ACK */
+ uint16_t type; /* Major type. */
+ uint16_t len; /* Payload length, excl. header and trailing byte */
+ uint32_t id; /* Echoed in responses */
+ uint32_t sum; /* Unsigned sum of all payload bytes */
+ uint8_t payload[0];
+} PACKED kdd_hdr;
+
+#define KDD_PKT_CMD 0x0002 /* Debugger commands (and replies to them) */
+#define KDD_PKT_MSG 0x0003 /* Kernel messages for the user */
+#define KDD_PKT_STC 0x0007 /* State change notification */
+#define KDD_PKT_REG 0x000b /* Registry change notification (?) */
+#define KDD_PKT_MAX 0x000b
+
+#define KDD_ACK_OK 0x0004 /* Checksum, ID and type all fine */
+#define KDD_ACK_BAD 0x0005 /* Something is bogus */
+#define KDD_ACK_RST 0x0006 /* Not really an ack; one each way to resync */
+
+
+/*****************************************************************************
+ * Debugger commands, carried over the serial line. In this protocol,
+ * we ignore the serial-level acking; when we talk about a response,
+ * it's another packet, sent after the request was acked, and which will
+ * itself be acked.
+ *
+ * The debugger client sends commands to the kernel, all of which have
+ * major type 2 and are 56 bytes long (not including the serial header).
+ * Not all the 56 bytes are used in every command, but the client
+ * doesn't bother to zero unused fields. Most commands are responded to
+ * by a packet with the same subtype, containing at least a status code
+ * to indicate success or failure.
+ */
+
+#define KDD_STATUS_SUCCESS 0x00000000
+#define KDD_STATUS_FAILURE 0xc0000001
+#define KDD_STATUS_PENDING 0x00000103
+
+/* Memory access. Read commands are echoed in the response with the
+ * status and length_rsp fields updated, and the read data appended to the
+ * packet. Writes are the same, but with the data appended to the
+ * write command, not the response. */
+
+#define KDD_CMD_READ_VA 0x00003130 /* "01" */
+#define KDD_CMD_WRITE_VA 0x00003131 /* "11" */
+#define KDD_CMD_READ_CTRL 0x00003137 /* "71" */
+#define KDD_CMD_WRITE_CTRL 0x00003138 /* "81" */
+#define KDD_CMD_READ_PA 0x0000313D /* "=1" */
+#define KDD_CMD_WRITE_PA 0x0000313E /* ">1" */
+
+/* Not sure what this is, but it doesn't require a response */
+#define KDD_CMD_WRITE_Z 0x0000315A /* "Z1" */
+
+typedef struct {
+ uint32_t u1;
+ uint32_t status; /* IN: STATUS_PENDING; OUT: result status. */
+ uint32_t u2;
+ uint64_t addr; /* IN: address of start of read/write */
+ uint32_t length_req; /* IN: bytes to read/write */
+ uint32_t length_rsp; /* OUT: bytes successfully read/written */
+} PACKED kdd_cmd_mem;
+
+/* CPU register access. As for memory accesses, but the data is a
+ * fixed-length block of register info. */
+
+#define KDD_CMD_READ_REGS 0x00003132 /* "21" */
+#define KDD_CMD_WRITE_REGS 0x00003133 /* "31" */
+
+typedef struct {
+ uint16_t u1;
+ uint16_t cpu; /* IN: Zero-based processor ID */
+ uint32_t status; /* IN: STATUS_PENDING; OUT: result status. */
+} PACKED kdd_cmd_regs;
+
+#define KDD_CMD_READ_MSR 0x00003152 /* "R1" */
+#define KDD_CMD_WRITE_MSR 0x00003153 /* "S1" */
+
+typedef struct {
+ uint32_t u1;
+ uint32_t status; /* IN: STATUS_PENDING; OUT: result status. */
+ uint32_t u2;
+ uint32_t msr; /* IN/OUT: MSR number */
+ uint64_t val; /* IN/OUT: MSR contents */
+} PACKED kdd_cmd_msr;
+
+/* Breakpoint commands. */
+
+#define KDD_CMD_SOFT_BP 0x00003135 /* "51" */
+
+typedef struct {
+ uint32_t u1;
+ uint32_t status; /* IN: STATUS_PENDING; OUT: result status. */
+ uint32_t u2;
+ uint32_t bp; /* IN: ID of breakpoint to operate on */
+} PACKED kdd_cmd_soft_bp;
+
+#define KDD_CMD_HARD_BP 0x0000315C /* "\1" */
+
+typedef struct {
+ uint32_t u1;
+ uint32_t status; /* IN: STATUS_PENDING; OUT: result status. */
+ uint32_t u2;
+ uint64_t address; /* IN: Address to trap on */
+ uint64_t u3;
+ uint64_t u4;
+ uint64_t u5;
+ uint64_t u6;
+} PACKED kdd_cmd_hard_bp;
+
+/* Flow control commands. These commands are _not_ responded to. */
+
+#define KDD_CMD_CONT1 0x00003136 /* "61" */
+#define KDD_CMD_CONT2 0x0000313c /* "<1" */
+
+#define KDD_DBG_EXCEPTION_HANDLED 0x00010001
+#define KDD_DBG_CONTINUE 0x00010002
+
+typedef struct {
+ uint32_t u1;
+ uint32_t reason1; /* IN: KDD_DBG_* */
+ uint32_t u2;
+ uint64_t reason2; /* IN: always same as reason1 */
+} PACKED kdd_cmd_cont;
+
+/* Handshake command. */
+
+#define KDD_CMD_SHAKE 0x00003146 /* "F1" */
+
+#define KDD_MACH_x32 0x014c
+#define KDD_MACH_x64 0x8664
+
+#define KDD_FLAGS_MP 0x0001
+#define KDD_FLAGS_64 0x0008
+
+typedef struct {
+ uint32_t u1;
+ uint32_t status; /* IN: STATUS_PENDING; OUT: result status. */
+ uint32_t u2;
+ uint16_t v_major; /* OUT: OS major version (0xf for NT) */
+ uint16_t v_minor; /* OUT: OS minor version (NT build number) */
+ uint16_t proto; /* OUT: Protocol version (6) */
+ uint16_t flags; /* OUT: Some flags (at least 0x3) */
+ uint16_t machine; /* OUT: Machine type */
+ uint8_t pkts; /* OUT: Number of packet types understood */
+ uint8_t states; /* OUT: Number of state-change types used */
+ uint8_t manips; /* OUT: number of "manipulation" types used */
+ uint8_t u3[3];
+ int64_t kern_addr; /* OUT: KernBase */
+ int64_t mods_addr; /* OUT: PsLoadedModuleList */
+ int64_t data_addr; /* OUT: DebuggerDataList */
+} PACKED kdd_cmd_shake;
+
+/* Change active CPU. This command is _not_ responded to */
+
+#define KDD_CMD_SETCPU 0x00003150 /* "P1" */
+
+typedef struct {
+ uint16_t u1;
+ uint16_t cpu; /* IN: Zero-based processor ID */
+ uint32_t status; /* IN: STATUS_PENDING */
+} PACKED kdd_cmd_setcpu;
+
+typedef struct {
+ uint32_t subtype; /* IN: KDD_CMD_x */
+ union {
+ kdd_cmd_mem mem;
+ kdd_cmd_regs regs;
+ kdd_cmd_msr msr;
+ kdd_cmd_soft_bp sbp;
+ kdd_cmd_hard_bp hbp;
+ kdd_cmd_cont cont;
+ kdd_cmd_shake shake;
+ kdd_cmd_setcpu setcpu;
+ uint8_t pad[52];
+ };
+ uint8_t data[0];
+} PACKED kdd_cmd;
+
+
+/*****************************************************************************
+ * Kernel messages to the debugger. The debugger does not respond to these
+ * beyond ACKing them and printing approprate things on the debugger
+ * console.
+ */
+
+/* Messages for the console */
+
+#define KDD_MSG_PRINT 0x00003230 /* "02" */
+
+typedef struct {
+ uint32_t subtype; /* KDD_MSG_PRINT */
+ uint32_t u1;
+ uint32_t length; /* Length in bytes of trailing string */
+ uint32_t u2;
+ uint8_t string[0]; /* Non-terminated character string */
+} PACKED kdd_msg;
+
+/* Registry updates (Hive loads?) */
+
+#define KDD_REG_CHANGE 0x00003430 /* "04" */
+
+typedef struct {
+ uint32_t subtype; /* KDD_REG_CHANGE */
+ uint32_t u1[15];
+ uint16_t string[0]; /* Null-terminated wchar string */
+} PACKED kdd_reg;
+
+/* State changes. After sending a state-change message the kernel halts
+ * until it receives a continue command from the debugger. */
+
+#define KDD_STC_STOP 0x00003030 /* "00" : Bug-check */
+#define KDD_STC_LOAD 0x00003031 /* "01" : Loaded a module */
+
+#define KDD_STC_STATUS_BREAKPOINT 0x80000003
+
+typedef struct {
+ uint16_t u1;
+ uint16_t cpu; /* Zero-based processor ID */
+ uint32_t ncpus; /* Number of processors */
+ uint32_t u2;
+ int64_t kthread; /* Kernel thread structure */
+ int64_t rip1; /* Instruction pointer, sign-extended */
+ uint64_t status; /* KDD_STC_STATUS_x */
+ uint64_t u3;
+ int64_t rip2; /* Same as rip1 */
+ uint64_t nparams; /* Number of stopcode parameters */
+ uint64_t params[15]; /* Stopcode parameters */
+ uint64_t first_chance; /* OS exn handlers not yet been run? */
+ uint32_t u4[2];
+ uint32_t ilen; /* Number of bytes of instruction following */
+ uint8_t inst[36]; /* VA contents from %eip onwards */
+} PACKED kdd_stc_stop;
+
+typedef struct {
+ uint32_t u1[3];
+ uint64_t u2;
+ uint64_t rip; /* Instruction pointer, sign-extended */
+ uint64_t u3[26];
+ uint8_t path[0]; /* Null-terminated ASCII path to loaded mod. */
+} PACKED kdd_stc_load;
+
+typedef struct {
+ uint32_t subtype; /* KDD_STC_x */
+ union {
+ kdd_stc_stop stop;
+ kdd_stc_load load;
+ };
+} PACKED kdd_stc;
+
+
+/*****************************************************************************
+ * Overall packet type
+ */
+
+typedef struct {
+ kdd_hdr h; /* Major type disambiguates union below */
+ union {
+ kdd_cmd cmd;
+ kdd_msg msg;
+ kdd_reg reg;
+ kdd_stc stc;
+ uint8_t payload[0];
+ };
+} PACKED kdd_pkt;
+
+
+/*****************************************************************************
+ * Processor state layouts
+ */
+
+/* User-visible register files */
+typedef union {
+ uint32_t pad[179];
+ struct {
+ uint32_t u1[7]; /* Flags, DRx?? */
+ uint8_t fp[112]; /* FP save state (why 112 not 108?) */
+ int32_t gs;
+ int32_t fs;
+ int32_t es;
+ int32_t ds;
+ int32_t edi;
+ int32_t esi;
+ int32_t ebx;
+ int32_t edx;
+ int32_t ecx;
+ int32_t eax;
+ int32_t ebp;
+ int32_t eip;
+ int32_t cs;
+ int32_t eflags;
+ int32_t esp;
+ int32_t ss;
+ uint32_t sp2[37]; /* More 0x20202020. fp? */
+ uint32_t sp3; /* 0x00202020 */
+ };
+} PACKED kdd_regs_x86_32;
+
+typedef union {
+ uint64_t pad[154];
+ struct {
+
+ uint64_t u1[7];
+
+ uint16_t cs; //2*1c
+ uint16_t ds;
+ uint16_t es;
+ uint16_t fs;
+ uint16_t gs;
+ uint16_t ss;
+ uint32_t rflags;
+ uint64_t dr0;
+ uint64_t dr1;
+ uint64_t dr2;
+ uint64_t dr3;
+ uint64_t dr6;
+ uint64_t dr7;
+ int64_t rax;
+ int64_t rcx;
+ int64_t rdx;
+ int64_t rbx;
+ int64_t rsp;
+ int64_t rbp;
+ int64_t rsi;
+ int64_t rdi;
+ int64_t r8;
+ int64_t r9;
+ int64_t r10;
+ int64_t r11;
+ int64_t r12;
+ int64_t r13;
+ int64_t r14;
+ int64_t r15;
+ int64_t rip; //2*7c
+
+ uint64_t u2[32];
+
+ uint8_t fp[512]; // fp @2*100 .. 150 (+ more??)
+
+ uint64_t u3[26];
+ };
+} PACKED kdd_regs_x86_64;
+
+typedef union {
+ kdd_regs_x86_32 r32;
+ kdd_regs_x86_64 r64;
+} PACKED kdd_regs;
+
+/* System registers */
+typedef struct {
+ uint32_t cr0;
+ uint32_t cr2;
+ uint32_t cr3;
+ uint32_t cr4;
+ uint32_t dr0;
+ uint32_t dr1;
+ uint32_t dr2;
+ uint32_t dr3;
+ uint32_t dr6;
+ uint32_t dr7;
+ uint16_t gdt_pad;
+ uint16_t gdt_limit;
+ uint32_t gdt_base;
+ uint16_t idt_pad;
+ uint16_t idt_limit;
+ uint32_t idt_base;
+ uint16_t tss_sel;
+ uint16_t ldt_sel;
+ uint8_t u1[24];
+} PACKED kdd_ctrl_x86_32;
+
+typedef struct {
+ uint64_t cr0;
+ uint64_t cr2;
+ uint64_t cr3;
+ uint64_t cr4;
+ uint64_t dr0;
+ uint64_t dr1;
+ uint64_t dr2;
+ uint64_t dr3;
+ uint64_t dr6;
+ uint64_t dr7;
+ uint8_t gdt_pad[6];
+ uint16_t gdt_limit;
+ uint64_t gdt_base;
+ uint8_t idt_pad[6];
+ uint16_t idt_limit;
+ uint64_t idt_base;
+ uint16_t tss_sel;
+ uint16_t ldt_sel;
+ uint8_t u1[44];
+ uint64_t cr8;
+ uint8_t u2[40];
+ uint64_t efer; // XXX find out where EFER actually goes
+} PACKED kdd_ctrl_x86_64;
+
+typedef union {
+ kdd_ctrl_x86_32 c32;
+ kdd_ctrl_x86_64 c64;
+} kdd_ctrl;
+
+/*****************************************************************************
+ * Functions required from the emulator/hypervisor for the stub to work.
+ */
+
+typedef struct kdd_guest kdd_guest;
+
+/* Init and teardown guest-specific state */
+extern kdd_guest *kdd_guest_init(char *arg, FILE *log, int verbosity);
+extern void kdd_guest_teardown(kdd_guest *g);
+extern char *kdd_guest_identify(kdd_guest *g);
+
+/* Halt and restart the running guest */
+extern void kdd_halt(kdd_guest *g);
+extern void kdd_run(kdd_guest *g);
+
+/* How many CPUs are there? */
+extern int kdd_count_cpus(kdd_guest *g);
+
+/* Accessor for guest physical memory, returning bytes read/written */
+extern uint32_t kdd_access_physical(kdd_guest *g, uint64_t addr,
+ uint32_t len, uint8_t *buf, int write);
+
+/* Accessors for guest registers, returning 0 for success */
+extern int kdd_get_regs(kdd_guest *g, int cpuid, kdd_regs *r, int w64);
+extern int kdd_set_regs(kdd_guest *g, int cpuid, kdd_regs *r, int w64);
+
+/* Accessors for guest control registers, returning 0 for success */
+extern int kdd_get_ctrl(kdd_guest *g, int cpuid, kdd_ctrl *ctrl, int w64);
+extern int kdd_set_ctrl(kdd_guest *g, int cpuid, kdd_ctrl *ctrl, int w64);
+
+/* Accessors for guest MSRs, returning 0 for success */
+extern int kdd_wrmsr(kdd_guest *g, int cpuid, uint32_t msr, uint64_t value);
+extern int kdd_rdmsr(kdd_guest *g, int cpuid, uint32_t msr, uint64_t *value);
+
+
+/*****************************************************************************
+ * Logfile usefulness
+ */
+
+/* Verbosity:
+ * 0: errors (default)
+ * 1: operations
+ * 2: packets
+ * 3: _everything_ */
+
+#define KDD_LOG_IF(_v, _s, _fmt, _a...) do { \
+ if ((_s)->verbosity >= (_v)) { \
+ fprintf((_s)->log, (_fmt), ##_a); \
+ (void) fflush((_s)->log); \
+ } \
+} while (0)
+
+#define KDD_LOG(_s, _fmt, _a...) KDD_LOG_IF(1, (_s), (_fmt), ##_a)
+#define KDD_DEBUG(_s, _fmt, _a...) KDD_LOG_IF(3, (_s), (_fmt), ##_a)
+
+#endif /* _KDD_H_ */
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