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/*
* Mach Operating System
* Copyright (c) 1993,1992 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#include "mach_ttd.h"
#if MACH_TTD
#include <mach/machine/eflags.h>
#include <kern/thread.h>
#include <kern/processor.h>
#include <mach/thread_status.h>
#include <mach/vm_param.h>
#include <i386/seg.h>
#include <sys/types.h>
#include <ttd/ttd_types.h>
#include <ttd/ttd_stub.h>
#include <machine/kttd_machdep.h>
/*
* Shamelessly copied from the ddb sources:
*/
struct i386_saved_state *kttd_last_saved_statep;
struct i386_saved_state kttd_nested_saved_state;
unsigned last_kttd_sp;
struct i386_saved_state kttd_regs; /* was ddb_regs */
extern int kttd_debug;
extern boolean_t kttd_enabled;
extern vm_offset_t virtual_end;
#define I386_BREAKPOINT 0xcc
/*
* kernel map
*/
extern vm_map_t kernel_map;
boolean_t kttd_console_init(void)
{
/*
* Get local machine's IP address via bootp.
*/
return(ttd_ip_bootp());
}
/*
* Execute a break instruction that will invoke ttd
*/
void kttd_break(void)
{
if (!kttd_enabled)
return;
asm("int3");
}
/*
* Halt all processors on the 386at (not really applicable).
*/
void kttd_halt_processors(void)
{
/* XXX Fix for Sequent!!! */
/* Only one on AT386, so ignore for now... */
}
/*
* Determine whether or not the ehternet device driver supports
* ttd.
*/
boolean_t kttd_supported(void)
{
return ((int)ttd_get_packet != NULL);
}
/*
* Return the ttd machine type for the i386at
*/
ttd_machine_type get_ttd_machine_type(void)
{
return TTD_AT386;
}
void kttd_machine_getregs(struct i386_gdb_register_state *ttd_state)
{
ttd_state->gs = kttd_regs.gs;
ttd_state->fs = kttd_regs.fs;
ttd_state->es = kttd_regs.es;
ttd_state->ds = kttd_regs.ds;
ttd_state->edi = kttd_regs.edi;
ttd_state->esi = kttd_regs.esi;
ttd_state->ebp = kttd_regs.ebp;
/*
* This is set up to point to the right place in
* kttd_trap and .
*/
ttd_state->esp = kttd_regs.uesp;
ttd_state->ebx = kttd_regs.ebx;
ttd_state->edx = kttd_regs.edx;
ttd_state->ecx = kttd_regs.ecx;
ttd_state->eax = kttd_regs.eax;
ttd_state->eip = kttd_regs.eip;
ttd_state->cs = kttd_regs.cs;
ttd_state->efl = kttd_regs.efl;
ttd_state->ss = kttd_regs.ss;
}
void kttd_machine_setregs(struct i386_gdb_register_state *ttd_state)
{
if (kttd_regs.gs != ttd_state->gs) {
if (kttd_debug)
printf("gs 0x%x:0x%x, ", kttd_regs.gs, ttd_state->gs);
kttd_regs.gs = ttd_state->gs;
}
if (kttd_regs.fs != ttd_state->fs) {
if (kttd_debug)
printf("fs 0x%x:0x%x, ", kttd_regs.fs, ttd_state->fs);
kttd_regs.fs = ttd_state->fs;
}
if (kttd_regs.es != ttd_state->es) {
if (kttd_debug)
printf("es 0x%x:0x%x, ", kttd_regs.es, ttd_state->es);
kttd_regs.es = ttd_state->es;
}
if (kttd_regs.ds != ttd_state->ds) {
if (kttd_debug)
printf("ds 0x%x:0x%x, ", kttd_regs.ds, ttd_state->ds);
kttd_regs.ds = ttd_state->ds;
}
if (kttd_regs.edi != ttd_state->edi) {
if (kttd_debug)
printf("edi 0x%x:0x%x, ", kttd_regs.edi, ttd_state->edi);
kttd_regs.edi = ttd_state->edi;
}
if (kttd_regs.esi != ttd_state->esi) {
if (kttd_debug)
printf("esi 0x%x:0x%x, ", kttd_regs.esi, ttd_state->esi);
kttd_regs.esi = ttd_state->esi;
}
if (kttd_regs.ebp != ttd_state->ebp) {
if (kttd_debug)
printf("ebp 0x%x:0x%x, ", kttd_regs.ebp, ttd_state->ebp);
kttd_regs.ebp = ttd_state->ebp;
}
if (kttd_regs.ebx != ttd_state->ebx) {
if (kttd_debug)
printf("ebx 0x%x:0x%x, ", kttd_regs.ebx, ttd_state->ebx);
kttd_regs.ebx = ttd_state->ebx;
}
if (kttd_regs.edx != ttd_state->edx) {
if (kttd_debug)
printf("edx 0x%x:0x%x, ", kttd_regs.edx, ttd_state->edx);
kttd_regs.edx = ttd_state->edx;
}
if (kttd_regs.ecx != ttd_state->ecx) {
if (kttd_debug)
printf("ecx 0x%x:0x%x, ", kttd_regs.ecx, ttd_state->ecx);
kttd_regs.ecx = ttd_state->ecx;
}
if (kttd_regs.eax != ttd_state->eax) {
if (kttd_debug)
printf("eax 0x%x:0x%x, ", kttd_regs.eax, ttd_state->eax);
kttd_regs.eax = ttd_state->eax;
}
if (kttd_regs.eip != ttd_state->eip) {
if (kttd_debug)
printf("eip 0x%x:0x%x, ", kttd_regs.eip, ttd_state->eip);
kttd_regs.eip = ttd_state->eip;
}
if (kttd_regs.cs != ttd_state->cs) {
if (kttd_debug)
printf("cs 0x%x:0x%x, ", kttd_regs.cs, ttd_state->cs);
kttd_regs.cs = ttd_state->cs;
}
if (kttd_regs.efl != ttd_state->efl) {
if (kttd_debug)
printf("efl 0x%x:0x%x, ", kttd_regs.efl, ttd_state->efl);
kttd_regs.efl = ttd_state->efl;
}
#if 0
/*
* We probably shouldn't mess with the uesp or the ss? XXX
*/
if (kttd_regs.ss != ttd_state->ss) {
if (kttd_debug)
printf("ss 0x%x:0x%x, ", kttd_regs.ss, ttd_state->ss);
kttd_regs.ss = ttd_state->ss;
}
#endif /* 0 */
}
/*
* Enable a page for access, faulting it in if necessary
*/
boolean_t kttd_mem_access(vm_offset_t offset, vm_prot_t access)
{
kern_return_t code;
/*
* VM_MIN_KERNEL_ADDRESS if the beginning of equiv
* mapped kernel memory. virtual_end is the end.
* If it's in between it's always accessible
*/
if (offset >= VM_MIN_KERNEL_ADDRESS && offset < virtual_end)
return TRUE;
if (offset >= virtual_end) {
/*
* fault in the memory just to make sure we can access it
*/
if (kttd_debug)
printf(">>>>>>>>>>Faulting in memory: 0x%x, 0x%x\n",
trunc_page(offset), access);
code = vm_fault(kernel_map, trunc_page(offset), access, FALSE,
FALSE, (void (*)()) 0);
}else{
/*
* Check for user thread
*/
#if 1
if ((current_thread() != THREAD_NULL) &&
(current_thread()->task->map->pmap != kernel_pmap) &&
(current_thread()->task->map->pmap != PMAP_NULL)) {
code = vm_fault(current_thread()->task->map,
trunc_page(offset), access, FALSE,
FALSE, (void (*)()) 0);
}else{
/*
* Invalid kernel address (below VM_MIN_KERNEL_ADDRESS)
*/
return FALSE;
}
#else
if (kttd_debug)
printf("==========Would've tried to map in user area 0x%x\n",
trunc_page(offset));
return FALSE;
#endif /* 0 */
}
return (code == KERN_SUCCESS);
}
/*
* See if we modified the kernel text and if so flush the caches.
* This routine is never called with a range that crosses a page
* boundary.
*/
void kttd_flush_cache(vm_offset_t offset, vm_size_t length)
{
/* 386 doesn't need this */
return;
}
/*
* Insert a breakpoint into memory.
*/
boolean_t kttd_insert_breakpoint(vm_address_t address,
ttd_saved_inst *saved_inst)
{
/*
* Saved old memory data:
*/
*saved_inst = *(unsigned char *)address;
/*
* Put in a Breakpoint:
*/
*(unsigned char *)address = I386_BREAKPOINT;
return TRUE;
}
/*
* Remove breakpoint from memory.
*/
boolean_t kttd_remove_breakpoint(vm_address_t address,
ttd_saved_inst saved_inst)
{
/*
* replace it:
*/
*(unsigned char *)address = (saved_inst & 0xff);
return TRUE;
}
/*
* Set single stepping mode. Assumes that program counter is set
* to the location where single stepping is to begin. The 386 is
* an easy single stepping machine, ie. built into the processor.
*/
boolean_t kttd_set_machine_single_step(void)
{
/* Turn on Single Stepping */
kttd_regs.efl |= EFL_TF;
return TRUE;
}
/*
* Clear single stepping mode.
*/
boolean_t kttd_clear_machine_single_step(void)
{
/* Turn off the trace flag */
kttd_regs.efl &= ~EFL_TF;
return TRUE;
}
/*
* kttd_type_to_ttdtrap:
*
* Fills in the task and thread info structures with the reason
* for entering the Teledebugger (bp, single step, pg flt, etc.)
*
*/
void kttd_type_to_ttdtrap(int type)
{
/* XXX Fill this in sometime for i386 */
}
/*
* kttd_trap:
*
* This routine is called from the trap or interrupt handler when a
* breakpoint instruction is encountered or a single step operation
* completes. The argument is a pointer to a machine dependent
* saved_state structure that was built on the interrupt or kernel stack.
*
*/
boolean_t kttd_trap(int type, int code, struct i386_saved_state *regs)
{
int s;
if (kttd_debug)
printf("kttd_TRAP, before splhigh()\n");
/*
* TTD isn't supported by the driver.
*
* Try to switch off to kdb if it is resident.
* Otherwise just hang (this might be panic).
*
* Check to make sure that TTD is supported.
* (Both by the machine's driver's, and bootp if using ether).
*/
if (!kttd_supported()) {
kttd_enabled = FALSE;
return FALSE;
}
s = splhigh();
/*
* We are already in TTD!
*/
if (++kttd_active > MAX_KTTD_ACTIVE) {
printf("kttd_trap: RE-ENTERED!!!\n");
}
if (kttd_debug)
printf("kttd_TRAP, after splhigh()\n");
/* Should switch to kttd's own stack here. */
kttd_regs = *regs;
if ((regs->cs & 0x3) == 0) {
/*
* Kernel mode - esp and ss not saved
*/
kttd_regs.uesp = (int)®s->uesp; /* kernel stack pointer */
kttd_regs.ss = KERNEL_DS;
}
/*
* If this was not entered via an interrupt (type != -1)
* then we've entered via a bpt, single, etc. and must
* set the globals.
*
* Setup the kttd globals for entry....
*/
if (type != -1) {
kttd_current_request = NULL;
kttd_current_length = 0;
kttd_current_kmsg = NULL;
kttd_run_status = FULL_STOP;
}else{
/*
* We know that we can only get here if we did a kttd_intr
* since it's the way that we are called with type -1 (via
* the trampoline), so we don't have to worry about entering
* from Cntl-Alt-D like the mips does.
*/
/*
* Perform sanity check!
*/
if ((kttd_current_request == NULL) ||
(kttd_current_length == 0) ||
(kttd_current_kmsg == NULL) ||
(kttd_run_status != ONE_STOP)) {
printf("kttd_trap: INSANITY!!!\n");
}
}
kttd_task_trap(type, code, (regs->cs & 0x3) != 0);
regs->eip = kttd_regs.eip;
regs->efl = kttd_regs.efl;
regs->eax = kttd_regs.eax;
regs->ecx = kttd_regs.ecx;
regs->edx = kttd_regs.edx;
regs->ebx = kttd_regs.ebx;
if (regs->cs & 0x3) {
/*
* user mode - saved esp and ss valid
*/
regs->uesp = kttd_regs.uesp; /* user stack pointer */
regs->ss = kttd_regs.ss & 0xffff; /* user stack segment */
}
regs->ebp = kttd_regs.ebp;
regs->esi = kttd_regs.esi;
regs->edi = kttd_regs.edi;
regs->es = kttd_regs.es & 0xffff;
regs->cs = kttd_regs.cs & 0xffff;
regs->ds = kttd_regs.ds & 0xffff;
regs->fs = kttd_regs.fs & 0xffff;
regs->gs = kttd_regs.gs & 0xffff;
if (--kttd_active < MIN_KTTD_ACTIVE)
printf("ttd_trap: kttd_active < 0\n");
if (kttd_debug) {
printf("Leaving kttd_trap, kttd_active = %d\n", kttd_active);
}
/*
* Only reset this if we entered kttd_trap via an async trampoline.
*/
if (type == -1) {
if (kttd_run_status == RUNNING)
printf("kttd_trap: $$$$$ run_status already RUNNING! $$$$$\n");
kttd_run_status = RUNNING;
}
/* Is this right? XXX */
kttd_run_status = RUNNING;
(void) splx(s);
/*
* Return true, that yes we handled the trap.
*/
return TRUE;
}
/*
* Enter KTTD through a network packet trap.
* We show the registers as of the network interrupt
* instead of those at its call to KDB.
*/
struct int_regs {
int gs;
int fs;
int edi;
int esi;
int ebp;
int ebx;
struct i386_interrupt_state *is;
};
void
kttd_netentry(int_regs)
struct int_regs *int_regs;
{
struct i386_interrupt_state *is = int_regs->is;
int s;
if (kttd_debug)
printf("kttd_NETENTRY before slphigh()\n");
s = splhigh();
if (kttd_debug)
printf("kttd_NETENTRY after slphigh()\n");
if (is->cs & 0x3) {
/*
* Interrupted from User Space
*/
kttd_regs.uesp = ((int *)(is+1))[0];
kttd_regs.ss = ((int *)(is+1))[1];
}
else {
/*
* Interrupted from Kernel Space
*/
kttd_regs.ss = KERNEL_DS;
kttd_regs.uesp= (int)(is+1);
}
kttd_regs.efl = is->efl;
kttd_regs.cs = is->cs;
kttd_regs.eip = is->eip;
kttd_regs.eax = is->eax;
kttd_regs.ecx = is->ecx;
kttd_regs.edx = is->edx;
kttd_regs.ebx = int_regs->ebx;
kttd_regs.ebp = int_regs->ebp;
kttd_regs.esi = int_regs->esi;
kttd_regs.edi = int_regs->edi;
kttd_regs.ds = is->ds;
kttd_regs.es = is->es;
kttd_regs.fs = int_regs->fs;
kttd_regs.gs = int_regs->gs;
kttd_active++;
kttd_task_trap(-1, 0, (kttd_regs.cs & 0x3) != 0);
kttd_active--;
if (kttd_regs.cs & 0x3) {
((int *)(is+1))[0] = kttd_regs.uesp;
((int *)(is+1))[1] = kttd_regs.ss & 0xffff;
}
is->efl = kttd_regs.efl;
is->cs = kttd_regs.cs & 0xffff;
is->eip = kttd_regs.eip;
is->eax = kttd_regs.eax;
is->ecx = kttd_regs.ecx;
is->edx = kttd_regs.edx;
int_regs->ebx = kttd_regs.ebx;
int_regs->ebp = kttd_regs.ebp;
int_regs->esi = kttd_regs.esi;
int_regs->edi = kttd_regs.edi;
is->ds = kttd_regs.ds & 0xffff;
is->es = kttd_regs.es & 0xffff;
int_regs->fs = kttd_regs.fs & 0xffff;
int_regs->gs = kttd_regs.gs & 0xffff;
if (kttd_run_status == RUNNING)
printf("kttd_netentry: %%%%% run_status already RUNNING! %%%%%\n");
kttd_run_status = RUNNING;
(void) splx(s);
}
#endif /* MACH_TTD */
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