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/*
* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <mach_kdp.h>
#include <mach/mach_types.h>
#include <mach/machine.h>
#include <mach/exception_types.h>
#include <kern/cpu_data.h>
#include <i386/trap.h>
#include <i386/mp.h>
#include <kdp/kdp_internal.h>
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
#include <IOKit/IOPlatformExpert.h> /* for PE_halt_restart */
#include <kern/machine.h> /* for halt_all_cpus */
#include <kern/thread.h>
#include <i386/thread.h>
#include <vm/vm_map.h>
#include <i386/pmap.h>
#define KDP_TEST_HARNESS 0
#if KDP_TEST_HARNESS
#define dprintf(x) printf x
#else
#define dprintf(x)
#endif
extern cpu_type_t cpuid_cputype(void);
extern cpu_subtype_t cpuid_cpusubtype(void);
void print_saved_state(void *);
void kdp_call(void);
int kdp_getc(void);
boolean_t kdp_call_kdb(void);
void kdp_getstate(i386_thread_state_t *);
void kdp_setstate(i386_thread_state_t *);
void kdp_print_phys(int);
int
machine_trace_thread(thread_t thread, uint32_t tracepos, uint32_t tracebound, int nframes, boolean_t user_p);
int
machine_trace_thread64(thread_t thread, uint32_t tracepos, uint32_t tracebound, int nframes, boolean_t user_p);
extern unsigned kdp_vm_read(caddr_t src, caddr_t dst, unsigned len);
void
kdp_exception(
unsigned char *pkt,
int *len,
unsigned short *remote_port,
unsigned int exception,
unsigned int code,
unsigned int subcode
)
{
kdp_exception_t *rq = (kdp_exception_t *)pkt;
rq->hdr.request = KDP_EXCEPTION;
rq->hdr.is_reply = 0;
rq->hdr.seq = kdp.exception_seq;
rq->hdr.key = 0;
rq->hdr.len = sizeof (*rq);
rq->n_exc_info = 1;
rq->exc_info[0].cpu = 0;
rq->exc_info[0].exception = exception;
rq->exc_info[0].code = code;
rq->exc_info[0].subcode = subcode;
rq->hdr.len += rq->n_exc_info * sizeof (kdp_exc_info_t);
bcopy((char *)rq, (char *)pkt, rq->hdr.len);
kdp.exception_ack_needed = TRUE;
*remote_port = kdp.exception_port;
*len = rq->hdr.len;
}
boolean_t
kdp_exception_ack(
unsigned char *pkt,
int len
)
{
kdp_exception_ack_t *rq = (kdp_exception_ack_t *)pkt;
if (((unsigned int) len) < sizeof (*rq))
return(FALSE);
if (!rq->hdr.is_reply || rq->hdr.request != KDP_EXCEPTION)
return(FALSE);
dprintf(("kdp_exception_ack seq %x %x\n", rq->hdr.seq, kdp.exception_seq));
if (rq->hdr.seq == kdp.exception_seq) {
kdp.exception_ack_needed = FALSE;
kdp.exception_seq++;
}
return(TRUE);
}
void
kdp_getstate(
x86_thread_state32_t *state
)
{
static x86_thread_state32_t null_state;
x86_saved_state32_t *saved_state;
saved_state = (x86_saved_state32_t *)kdp.saved_state;
*state = null_state;
state->eax = saved_state->eax;
state->ebx = saved_state->ebx;
state->ecx = saved_state->ecx;
state->edx = saved_state->edx;
state->edi = saved_state->edi;
state->esi = saved_state->esi;
state->ebp = saved_state->ebp;
if ((saved_state->cs & 0x3) == 0){ /* Kernel State */
state->esp = (unsigned int) &saved_state->uesp;
state->ss = KERNEL_DS;
} else {
state->esp = saved_state->uesp;
state->ss = saved_state->ss;
}
state->eflags = saved_state->efl;
state->eip = saved_state->eip;
state->cs = saved_state->cs;
state->ds = saved_state->ds;
state->es = saved_state->es;
state->fs = saved_state->fs;
state->gs = saved_state->gs;
}
void
kdp_setstate(
x86_thread_state32_t *state
)
{
x86_saved_state32_t *saved_state;
saved_state = (x86_saved_state32_t *)kdp.saved_state;
saved_state->eax = state->eax;
saved_state->ebx = state->ebx;
saved_state->ecx = state->ecx;
saved_state->edx = state->edx;
saved_state->edi = state->edi;
saved_state->esi = state->esi;
saved_state->ebp = state->ebp;
saved_state->efl = state->eflags;
#if 0
saved_state->frame.eflags &= ~( EFL_VM | EFL_NT | EFL_IOPL | EFL_CLR );
saved_state->frame.eflags |= ( EFL_IF | EFL_SET );
#endif
saved_state->eip = state->eip;
saved_state->fs = state->fs;
saved_state->gs = state->gs;
}
kdp_error_t
kdp_machine_read_regs(
__unused unsigned int cpu,
__unused unsigned int flavor,
char *data,
__unused int *size
)
{
static struct i386_float_state null_fpstate;
switch (flavor) {
case OLD_i386_THREAD_STATE:
case x86_THREAD_STATE32:
dprintf(("kdp_readregs THREAD_STATE\n"));
kdp_getstate((x86_thread_state32_t *)data);
*size = sizeof (x86_thread_state32_t);
return KDPERR_NO_ERROR;
case x86_FLOAT_STATE32:
dprintf(("kdp_readregs THREAD_FPSTATE\n"));
*(x86_float_state32_t *)data = null_fpstate;
*size = sizeof (x86_float_state32_t);
return KDPERR_NO_ERROR;
default:
dprintf(("kdp_readregs bad flavor %d\n", flavor));
*size = 0;
return KDPERR_BADFLAVOR;
}
}
kdp_error_t
kdp_machine_write_regs(
__unused unsigned int cpu,
unsigned int flavor,
char *data,
__unused int *size
)
{
switch (flavor) {
case OLD_i386_THREAD_STATE:
case x86_THREAD_STATE32:
dprintf(("kdp_writeregs THREAD_STATE\n"));
kdp_setstate((x86_thread_state32_t *)data);
return KDPERR_NO_ERROR;
case x86_FLOAT_STATE32:
dprintf(("kdp_writeregs THREAD_FPSTATE\n"));
return KDPERR_NO_ERROR;
default:
dprintf(("kdp_writeregs bad flavor %d\n"));
return KDPERR_BADFLAVOR;
}
}
void
kdp_machine_hostinfo(
kdp_hostinfo_t *hostinfo
)
{
int i;
hostinfo->cpus_mask = 0;
for (i = 0; i < machine_info.max_cpus; i++) {
if (cpu_data_ptr[i] == NULL)
continue;
hostinfo->cpus_mask |= (1 << i);
}
hostinfo->cpu_type = cpuid_cputype();
hostinfo->cpu_subtype = cpuid_cpusubtype();
}
void
kdp_panic(
const char *msg
)
{
kprintf("kdp panic: %s\n", msg);
__asm__ volatile("hlt");
}
void
kdp_reboot(void)
{
printf("Attempting system restart...");
/* Call the platform specific restart*/
if (PE_halt_restart)
(*PE_halt_restart)(kPERestartCPU);
/* If we do reach this, give up */
halt_all_cpus(TRUE);
}
int
kdp_intr_disbl(void)
{
return splhigh();
}
void
kdp_intr_enbl(int s)
{
splx(s);
}
int
kdp_getc()
{
return cnmaygetc();
}
void
kdp_us_spin(int usec)
{
delay(usec/100);
}
void print_saved_state(void *state)
{
x86_saved_state32_t *saved_state;
saved_state = state;
kprintf("pc = 0x%x\n", saved_state->eip);
kprintf("cr2= 0x%x\n", saved_state->cr2);
kprintf("rp = TODO FIXME\n");
kprintf("sp = 0x%x\n", saved_state);
}
void
kdp_sync_cache()
{
return; /* No op here. */
}
void
kdp_call()
{
__asm__ volatile ("int $3"); /* Let the processor do the work */
}
typedef struct _cframe_t {
struct _cframe_t *prev;
unsigned caller;
unsigned args[0];
} cframe_t;
#include <i386/pmap.h>
extern pt_entry_t *DMAP2;
extern caddr_t DADDR2;
void
kdp_print_phys(int src)
{
unsigned int *iptr;
int i;
*(int *) DMAP2 = 0x63 | (src & 0xfffff000);
invlpg((u_int) DADDR2);
iptr = (unsigned int *) DADDR2;
for (i = 0; i < 100; i++) {
kprintf("0x%x ", *iptr++);
if ((i % 8) == 0)
kprintf("\n");
}
kprintf("\n");
*(int *) DMAP2 = 0;
}
boolean_t
kdp_i386_trap(
unsigned int trapno,
x86_saved_state32_t *saved_state,
kern_return_t result,
vm_offset_t va
)
{
unsigned int exception, subcode = 0, code;
if (trapno != T_INT3 && trapno != T_DEBUG) {
kprintf("unexpected kernel trap 0x%x eip 0x%x cr2 0x%x \n",
trapno, saved_state->eip, saved_state->cr2);
if (!kdp.is_conn)
return FALSE;
}
mp_kdp_enter();
switch (trapno) {
case T_DIVIDE_ERROR:
exception = EXC_ARITHMETIC;
code = EXC_I386_DIVERR;
break;
case T_OVERFLOW:
exception = EXC_SOFTWARE;
code = EXC_I386_INTOFLT;
break;
case T_OUT_OF_BOUNDS:
exception = EXC_ARITHMETIC;
code = EXC_I386_BOUNDFLT;
break;
case T_INVALID_OPCODE:
exception = EXC_BAD_INSTRUCTION;
code = EXC_I386_INVOPFLT;
break;
case T_SEGMENT_NOT_PRESENT:
exception = EXC_BAD_INSTRUCTION;
code = EXC_I386_SEGNPFLT;
subcode = saved_state->err;
break;
case T_STACK_FAULT:
exception = EXC_BAD_INSTRUCTION;
code = EXC_I386_STKFLT;
subcode = saved_state->err;
break;
case T_GENERAL_PROTECTION:
exception = EXC_BAD_INSTRUCTION;
code = EXC_I386_GPFLT;
subcode = saved_state->err;
break;
case T_PAGE_FAULT:
exception = EXC_BAD_ACCESS;
code = result;
subcode = va;
break;
case T_WATCHPOINT:
exception = EXC_SOFTWARE;
code = EXC_I386_ALIGNFLT;
break;
case T_DEBUG:
case T_INT3:
exception = EXC_BREAKPOINT;
code = EXC_I386_BPTFLT;
break;
default:
exception = EXC_BAD_INSTRUCTION;
code = trapno;
break;
}
kdp_raise_exception(exception, code, subcode, saved_state);
mp_kdp_exit();
return TRUE;
}
boolean_t
kdp_call_kdb(
void)
{
return(FALSE);
}
unsigned int
kdp_ml_get_breakinsn(void)
{
return 0xcc;
}
extern pmap_t kdp_pmap;
#define RETURN_OFFSET 4
int
machine_trace_thread(thread_t thread, uint32_t tracepos, uint32_t tracebound, int nframes, boolean_t user_p)
{
uint32_t *tracebuf = (uint32_t *)tracepos;
uint32_t fence = 0;
uint32_t stackptr = 0;
uint32_t stacklimit = 0xfc000000;
int framecount = 0;
uint32_t init_eip = 0;
uint32_t prevsp = 0;
uint32_t framesize = 2 * sizeof(vm_offset_t);
if (user_p) {
x86_saved_state32_t *iss32;
iss32 = USER_REGS32(thread);
init_eip = iss32->eip;
stackptr = iss32->ebp;
/* This bound isn't useful, but it doesn't hinder us*/
stacklimit = 0xffffffff;
kdp_pmap = thread->task->map->pmap;
}
else {
/*Examine the i386_saved_state at the base of the kernel stack*/
stackptr = STACK_IKS(thread->kernel_stack)->k_ebp;
init_eip = STACK_IKS(thread->kernel_stack)->k_eip;
}
*tracebuf++ = init_eip;
for (framecount = 0; framecount < nframes; framecount++) {
if ((tracebound - ((uint32_t) tracebuf)) < (4 * framesize)) {
tracebuf--;
break;
}
*tracebuf++ = stackptr;
/* Invalid frame, or hit fence */
if (!stackptr || (stackptr == fence)) {
break;
}
/* Stack grows downward */
if (stackptr < prevsp) {
break;
}
/* Unaligned frame */
if (stackptr & 0x0000003) {
break;
}
if (stackptr > stacklimit) {
break;
}
if (kdp_vm_read((caddr_t) (stackptr + RETURN_OFFSET), (caddr_t) tracebuf, sizeof(caddr_t)) != sizeof(caddr_t)) {
break;
}
tracebuf++;
prevsp = stackptr;
if (kdp_vm_read((caddr_t) stackptr, (caddr_t) &stackptr, sizeof(caddr_t)) != sizeof(caddr_t)) {
*tracebuf++ = 0;
break;
}
}
kdp_pmap = 0;
return ((uint32_t) tracebuf - tracepos);
}
/* This is a stub until the x86 64-bit model becomes clear */
int
machine_trace_thread64(__unused thread_t thread, __unused uint32_t tracepos, __unused uint32_t tracebound, __unused int nframes, __unused boolean_t user_p) {
return 0;
}