/*
* UAE - The Un*x Amiga Emulator
*
* Enforcer Like Support
*
* Copyright 2000-2003 Bernd Roesch and Sebastian Bauer
*/

#include <stdlib.h>

#include "sysconfig.h"
#include "sysdeps.h"

#include "options.h"
#include "memory.h"
#include "custom.h"
#include "newcpu.h"
#include "uae.h"
#include "xwin.h"
#include "enforcer.h"
#include "debug.h"

int enforcermode = 0;

#ifdef AHI

#if defined(JIT)
#define NMEM_OFFSET NATMEM_OFFSET
#else
#define special_mem_r
#define special_mem_w
#define NMEM_OFFSET 0
#endif

/* Configurable options */
#define ENFORCESIZE 1024
#define STACKLINES 5
#define BACKTRACELONGS 500
#define INSTRUCTIONLINES 17

#define ISEXEC(addr) ((addr) >= 4 && (addr) <= 7)
#define ISILLEGAL_LONG(addr) ((addr) < 4 || ((addr) > 4 && (addr) < ENFORCESIZE))
#define ISILLEGAL_WORD(addr) ((addr) < ENFORCESIZE)
#define ISILLEGAL_BYTE(addr) ((addr) < ENFORCESIZE)

extern uae_u8 *natmem_offset;

static int enforcer_installed = 0;
static int enforcer_hit = 0; /* set to 1 if displaying the hit */

#define ENFORCER_BUF_SIZE 8192
static TCHAR enforcer_buf[ENFORCER_BUF_SIZE];

uae_u32 (REGPARAM3 *saved_chipmem_lget) (uaecptr addr);
uae_u32 (REGPARAM3 *saved_chipmem_wget) (uaecptr addr);
uae_u32 (REGPARAM3 *saved_chipmem_bget) (uaecptr addr);
void (REGPARAM3 *saved_chipmem_lput) (uaecptr addr, uae_u32 l);
void (REGPARAM3 *saved_chipmem_wput) (uaecptr addr, uae_u32 w);
void (REGPARAM3 *saved_chipmem_bput) (uaecptr addr, uae_u32 b);
int (REGPARAM3 *saved_chipmem_check) (uaecptr addr, uae_u32 size);
uae_u8 *(REGPARAM3 *saved_chipmem_xlate) (uaecptr addr);
uae_u32 (REGPARAM3 *saved_dummy_lget) (uaecptr addr);
uae_u32 (REGPARAM3 *saved_dummy_wget) (uaecptr addr);
uae_u32 (REGPARAM3 *saved_dummy_bget) (uaecptr addr);
void (REGPARAM3 *saved_dummy_lput) (uaecptr addr, uae_u32 l);
void (REGPARAM3 *saved_dummy_wput) (uaecptr addr, uae_u32 w);
void (REGPARAM3 *saved_dummy_bput) (uaecptr addr, uae_u32 b);
int (REGPARAM3 *saved_dummy_check) (uaecptr addr, uae_u32 size);

/*************************************************************
Returns the first node entry of an exec list or 0 if
empty
*************************************************************/
static uae_u32 amiga_list_first (uae_u32 list)
{
	uae_u32 node = get_long (list);      /* lh_Head */
	if (!node)
		return 0;
	if (!get_long (node))
		return 0;   /* ln_Succ */
	return node;
}

/*************************************************************
Returns the next node of an exec node or 0 if it was the
last element
*************************************************************/
static uae_u32 amiga_node_next (uae_u32 node)
{
	uae_u32 next = get_long (node);    /* ln_Succ */
	if (!next)
		return 0;
	if (!get_long (next))
		return 0; /* ln_Succ */
	return next;
}

/*************************************************************
Converts an amiga address to a native one or NULL if this
is not possible, Size specified the number of bytes you
want to access
*************************************************************/
static uae_u8 *amiga2native (uae_u32 aptr, int size)
{
	addrbank bank = get_mem_bank (aptr);

	/* Check if the address can be translated to native */
	if (bank.check (aptr, size)) {
		return bank.xlateaddr (aptr);
	}
	return NULL;
}

/*************************************************************
Writes the Hunk and Offset of the given Address into buf
*************************************************************/
static int enforcer_decode_hunk_and_offset (TCHAR *buf, uae_u32 pc)
{
	uae_u32 sysbase = get_long (4);
	uae_u32 semaphore_list = sysbase + 532;
	uae_u32 library_list = sysbase + 378;

	/* First step is searching for the SegTracker semaphore */
	uae_u32 node = amiga_list_first (semaphore_list);
	while (node) {
		uae_u32 string = get_long (node + 10); /* ln_Name */
		uae_u8 *native_string = amiga2native (string, 100);

		if (native_string) {
			if (!strcmp ((char*)native_string, "SegTracker"))
				break;
		}
		node = amiga_node_next (node);
	}

	if (node) {
		/* We have found the segtracker semaphore. Soon after the
		* public documented semaphore structure Segtracker holds
		* an own list of all segements. We will use this list to
		* find out the hunk and offset (simliar to segtracker).
		*
		* Source of segtracker can be found at:
		*    http://www.sinz.org/Michael.Sinz/Enforcer/SegTracker.c.html
		*/

		uae_u32 seg_list = node + 46 + 4; /* sizeof(struct SignalSemaphore) + seg find */

		node = amiga_list_first (seg_list);
		while (node) {
			uae_u32 seg_entry = node + 12;
			uae_u32 address, size;
			int hunk = 0;

			/* Go through all entries until an address is 0
			* or the segment has been found */
			while ((address = get_long (seg_entry))) {
				size = get_long (seg_entry + 4);

				if (pc > address && pc < address + size) {
					uae_u32 name, offset;
					TCHAR *native_name;

					offset = pc - address - 4;
					name = get_long (node + 8); /* ln_Name */
					if (name) {
						native_name = au ((char*)amiga2native(name,100));
						if (!native_name)
							native_name = my_strdup (_T("Unknown"));
					} else {
						native_name = my_strdup (_T("Unknown"));
					}
					_stprintf (buf, _T("----> %08x - \"%s\" Hunk %04x Offset %08x\n"), pc, native_name, hunk, offset);
					xfree (native_name);
					return 1;
				}

				seg_entry += 8;
				hunk++;
			}
			node = amiga_node_next (node);
		}
	}

	node = amiga_list_first (library_list);
	while (node) {
		uae_u32 string = get_long (node + 10); /* ln_Name */
		uae_u8 *native_string = amiga2native (string, 100);

		if (native_string) {
			if (!strcmp ((char*)native_string, "debug.library"))
				break;
		}
		node = amiga_node_next (node);
	}

	/* AROS debug.library */
	if (node) {
		uae_u32 seg_list = node + 34; /* sizeof(struct Library) */

		node = amiga_list_first (seg_list);
		while (node) {
			uae_u32 start = get_long (node + 12);
			uae_u32 end = get_long (node + 16);
			if (pc > start && pc < end) {
				TCHAR *native_name;
				uae_u32 hunk = get_long (node + 28);
				uae_u32 offset = pc - (get_long (node + 8) << 2);
				uaecptr mod = get_long (node + 20);
				native_name = au ((char*)amiga2native (mod + 24, 100));
				_stprintf (buf, _T("----> %08x - \"%s\" Hunk %04x Offset %08x\n"), pc, native_name, hunk, offset);
				xfree (native_name);
				return 1;
			}
			node = amiga_node_next (node);
		}

	}
	return 0;
}

/*************************************************************
Display the enforcer hit
*************************************************************/
static void enforcer_display_hit (const TCHAR *addressmode, uae_u32 pc, uaecptr addr)
{
	uae_u32 a7;
	uae_u32 sysbase;
	uae_u32 this_task;
	uae_u32 task_name;
	TCHAR *native_task_name = NULL;
	int i, j;
	static TCHAR buf[256],instrcode[256];
	static TCHAR lines[INSTRUCTIONLINES/2][256];
	static uaecptr bestpc_array[INSTRUCTIONLINES/2][5];
	static int bestpc_idxs[INSTRUCTIONLINES/2];
	TCHAR *enforcer_buf_ptr = enforcer_buf;
	uaecptr bestpc, pospc, nextpc, temppc;

	if (enforcer_hit)
		return; /* our function itself generated a hit ;), avoid endless loop */
	if (regs.vbr < 0x100 && addr >= 0x0c && addr < 0x80)
		return;

	enforcer_hit = 1;

	sysbase = get_long (4);
	if (sysbase < 0x100 || !valid_address (sysbase, 1000))
		goto end;
	this_task = get_long (sysbase + 276);
	if (this_task < 0x100 || !valid_address (this_task, 1000))
		goto end;

	task_name = get_long (this_task + 10); /* ln_Name */
	native_task_name = au ((char*)amiga2native (task_name, 100));
	/*if (strcmp(native_task_name,"c:MCP")!=0)
	{
	Exception (0x2d,0);
	}*/
	_tcscpy (enforcer_buf_ptr, _T("Enforcer Hit! Bad program\n"));
	enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);

	_stprintf (buf, _T("Illegal %s: %08x"), addressmode, addr);
	_stprintf (enforcer_buf_ptr, _T("%-48sPC: %08x\n"), buf, pc);
	enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);

	/* Data registers */
	_stprintf (enforcer_buf_ptr, _T("Data: %08x %08x %08x %08x %08x %08x %08x %08x\n"),
		m68k_dreg (regs, 0), m68k_dreg (regs, 1), m68k_dreg (regs, 2), m68k_dreg (regs, 3),
		m68k_dreg (regs, 4), m68k_dreg (regs, 5), m68k_dreg (regs, 6), m68k_dreg (regs, 7));
	enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);

	/* Address registers */
	_stprintf (enforcer_buf_ptr, _T("Addr: %08x %08x %08x %08x %08x %08x %08x %08x\n"),
		m68k_areg (regs, 0), m68k_areg (regs, 1), m68k_areg (regs, 2), m68k_areg (regs, 3),
		m68k_areg (regs, 4), m68k_areg (regs, 5), m68k_areg (regs, 6), m68k_areg (regs, 7));
	enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);

	/* Stack */
	a7 = m68k_areg (regs, 7);
	for (i = 0; i < 8 * STACKLINES; i++) {
		a7 += 4;
		if (!(i % 8)) {
			_tcscpy (enforcer_buf_ptr, _T("Stck:"));
			enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);
		}
		_stprintf (enforcer_buf_ptr, _T(" %08x"),get_long (a7));
		enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);

		if (i%8 == 7)
			*enforcer_buf_ptr++ = '\n';
	}

	/* Segtracker output */
	if (enforcer_decode_hunk_and_offset (buf, pc)) {
		_tcscpy (enforcer_buf_ptr, buf);
		enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);
	}

	uae_u32 oldaddrs[BACKTRACELONGS];
	a7 = m68k_areg (regs, 7);
	for (i = 0; i < BACKTRACELONGS; i++) {
		uae_u32 addr;
		a7 += 4;
		addr = get_long (a7);
		for (j = 0; j < i; j++) {
			if (oldaddrs[j] == addr)
				break;
		}
		oldaddrs[i] = addr;
		if (j == i && addr != pc) {
			if (enforcer_decode_hunk_and_offset (buf, addr)) {
				int l = uaetcslen (buf);

				if (ENFORCER_BUF_SIZE - (enforcer_buf_ptr - enforcer_buf) > l + 256) {
					_tcscpy (enforcer_buf_ptr, buf);
					enforcer_buf_ptr += l;
				}
			}
		}
	}

	/* Decode the instructions around the pc where the enforcer hit was caused.
	*
	* At first, the area before the pc, this not always done correctly because
	* it's done backwards */
	temppc = pc;

	memset (bestpc_array, 0, sizeof (bestpc_array));
	for (i = 0; i < INSTRUCTIONLINES / 2; i++)
		bestpc_idxs[i] = -1;

	for (i = 0; i < INSTRUCTIONLINES / 2; i++) {
		pospc = temppc;
		bestpc = 0;

		if (bestpc_idxs[i] == -1) {
			for (j = 0; j < 5; j++) {
				pospc -= 2;
				sm68k_disasm (buf, NULL, pospc, &nextpc, 0xffffffff);
				if (nextpc == temppc) {
					bestpc_idxs[i] = j;
					bestpc_array[i][j] = bestpc = pospc;
				}
			}
		} else {
			bestpc = bestpc_array[i][bestpc_idxs[i]];
		}

		if (!bestpc) {
			/* there was no best pc found, so it is high probable that
			* a former used best pc was wrong.
			*
			* We trace back and use the former best pc instead
			*/

			int former_idx;
			int leave = 0;

			do {
				if (!i) {
					leave = 1;
					break;
				}
				i--;
				former_idx = bestpc_idxs[i];
				bestpc_idxs[i] = -1;
				bestpc_array[i][former_idx] = 0;

				for (j = former_idx - 1; j >= 0; j--) {
					if (bestpc_array[i][j]) {
						bestpc_idxs[i] = j;
						break;
					}
				}
			} while (bestpc_idxs[i] == -1);
			if (leave)
				break;
			if (i)
				temppc = bestpc_array[i-1][bestpc_idxs[i-1]];
			else
				temppc = pc;
			i--; /* will be increased in after continue */
			continue;
		}

		sm68k_disasm (buf, instrcode, bestpc, NULL, 0xffffffff);
		_stprintf (lines[i], _T("%08x :   %-20s %s\n"), bestpc, instrcode, buf);
		temppc = bestpc;
	}

	i--;
	for (; i >= 0; i--) {
		_tcscpy (enforcer_buf_ptr, lines[i]);
		enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);
	}

	/* Now the instruction after the pc including the pc */
	temppc = pc;
	for (i = 0; i < (INSTRUCTIONLINES + 1) / 2; i++) {
		sm68k_disasm (buf, instrcode, temppc, &nextpc, 0xffffffff);
		_stprintf (enforcer_buf_ptr, _T("%08x : %s %-20s %s\n"), temppc,
			(i == 0 ? _T("*") : _T(" ")), instrcode, buf);
		enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);
		temppc = nextpc;
	}

	if (!native_task_name)
		native_task_name = my_strdup(_T("Unknown"));
	_stprintf (enforcer_buf_ptr, _T("Name: \"%s\"\n\n"), native_task_name);
	enforcer_buf_ptr += _tcslen (enforcer_buf_ptr);

	console_out (enforcer_buf);
	write_log (_T("%s"), enforcer_buf);
	if (!debug_enforcer()) {
		sleep_millis (5);
		doflashscreen ();
	}

end:
	xfree (native_task_name);
	enforcer_hit = 0;
}

static uae_u32 REGPARAM2 chipmem_lget2 (uaecptr addr)
{
	uae_u32 *m;

	addr -= chipmem_start_addr & chipmem_bank.mask;
	addr &= chipmem_bank.mask;
	m = (uae_u32 *)(chipmem_bank.baseaddr + addr);

	if (ISILLEGAL_LONG (addr))
	{
		enforcer_display_hit (_T("LONG READ from"), m68k_getpc (), addr);
		if (enforcermode & 1)
			set_special (SPCFLAG_TRAP);
	}
	return do_get_mem_long (m);
}

static uae_u32 REGPARAM2 chipmem_wget2(uaecptr addr)
{
	uae_u16 *m;

	addr -= chipmem_start_addr & chipmem_bank.mask;
	addr &= chipmem_bank.mask;
	m = (uae_u16 *)(chipmem_bank.baseaddr + addr);

	if (ISILLEGAL_WORD (addr))
	{
		enforcer_display_hit (_T("WORD READ from"), m68k_getpc (), addr);
		if (enforcermode & 1)
			set_special (SPCFLAG_TRAP);
	}
	return do_get_mem_word (m);
}

static uae_u32 REGPARAM2 chipmem_bget2 (uaecptr addr)
{
	addr -= chipmem_start_addr & chipmem_bank.mask;
	addr &= chipmem_bank.mask;

	if (ISILLEGAL_BYTE (addr))
	{
		enforcer_display_hit (_T("BYTE READ from"), m68k_getpc (), addr);
		if (enforcermode & 1)
			set_special (SPCFLAG_TRAP);
	}

	return chipmem_bank.baseaddr[addr];
}

static void REGPARAM2 chipmem_lput2 (uaecptr addr, uae_u32 l)
{
	uae_u32 *m;

	addr -= chipmem_start_addr & chipmem_bank.mask;
	addr &= chipmem_bank.mask;
	m = (uae_u32 *)(chipmem_bank.baseaddr + addr);

	if (ISILLEGAL_LONG (addr))
	{
		enforcer_display_hit (_T("LONG WRITE to"), m68k_getpc (), addr);
		if (enforcermode & 1)
			if (addr != 0x100)
				set_special (SPCFLAG_TRAP);
	}
	if (ISEXEC (addr) || ISEXEC (addr + 1) || ISEXEC (addr + 2) || ISEXEC (addr + 3))
		return;
	do_put_mem_long (m, l);
}

static void REGPARAM2 chipmem_wput2 (uaecptr addr, uae_u32 w)
{
	uae_u16 *m;

	addr -= chipmem_start_addr & chipmem_bank.mask;
	addr &= chipmem_bank.mask;
	m = (uae_u16 *)(chipmem_bank.baseaddr + addr);

	if (ISILLEGAL_WORD (addr))
	{
		enforcer_display_hit (_T("WORD WRITE to"), m68k_getpc (), addr);
		if (enforcermode & 1)
			set_special (SPCFLAG_TRAP);
	}
	if (ISEXEC (addr) || ISEXEC (addr + 1))
		return;
	do_put_mem_word (m, w);
}

static void REGPARAM2 chipmem_bput2 (uaecptr addr, uae_u32 b)
{
	addr -= chipmem_start_addr & chipmem_bank.mask;
	addr &= chipmem_bank.mask;

	if (ISILLEGAL_BYTE (addr))
	{
		enforcer_display_hit (_T("BYTE WRITE to"), m68k_getpc (), addr);
		if (enforcermode & 1)
			set_special (SPCFLAG_TRAP);
	}
	if (ISEXEC (addr))
		return;
	chipmem_bank.baseaddr[addr] = b;
}

static int REGPARAM2 chipmem_check2 (uaecptr addr, uae_u32 size)
{
	addr -= chipmem_start_addr & chipmem_bank.mask;
	addr &= chipmem_bank.mask;
	return (addr + size) <= chipmem_bank.allocated_size;
}

static uae_u8 * REGPARAM2 chipmem_xlate2 (uaecptr addr)
{
	addr -= chipmem_start_addr & chipmem_bank.mask;
	addr &= chipmem_bank.mask;
	return chipmem_bank.baseaddr + addr;
}

static uae_u32 REGPARAM2 dummy_lget2 (uaecptr addr)
{
	enforcer_display_hit (_T("LONG READ from"), m68k_getpc (), addr);
	if (enforcermode & 1) {
		set_special (SPCFLAG_TRAP);
		return 0;
	}
	return 0xbadedeef;
}

#ifdef JIT
static int warned_JIT_0xF10000 = 0;
#endif

static uae_u32 REGPARAM2 dummy_wget2 (uaecptr addr)
{
#ifdef JIT
	if (addr >= 0x00F10000 && addr <= 0x00F7FFFF) {
		if (!warned_JIT_0xF10000) {
			warned_JIT_0xF10000 = 1;
			enforcer_display_hit (_T("LONG READ from"), m68k_getpc (), addr);
		}
		return 0;
	}
#endif
	enforcer_display_hit (_T("WORD READ from"), m68k_getpc (), addr);
	if (enforcermode & 1) {
		set_special (SPCFLAG_TRAP);
		return 0;
	}
	return 0xbadf;
}

static uae_u32	REGPARAM2 dummy_bget2 (uaecptr addr)
{
	enforcer_display_hit (_T("BYTE READ from"), m68k_getpc (), addr);
	if (enforcermode & 1) {
		set_special (SPCFLAG_TRAP);
		return 0;
	}
	return 0xbadedeef;
}

static void REGPARAM2 dummy_lput2 (uaecptr addr, uae_u32 l)
{
	enforcer_display_hit (_T("LONG WRITE to"), m68k_getpc (), addr);
	if (enforcermode & 1) {
		set_special (SPCFLAG_TRAP);
		return;
	}
}

static void REGPARAM2 dummy_wput2 (uaecptr addr, uae_u32 w)
{
	enforcer_display_hit (_T("WORD WRITE to"), m68k_getpc (), addr);
	if (enforcermode & 1) {
		set_special (SPCFLAG_TRAP);
		return;
	}
}

static void REGPARAM2 dummy_bput2 (uaecptr addr, uae_u32 b)
{
	enforcer_display_hit (_T("BYTE WRITE to"), m68k_getpc (), addr);
	if (enforcermode & 1) {
		set_special (SPCFLAG_TRAP);
		return;
	}
}

static int REGPARAM2 dummy_check2 (uaecptr addr, uae_u32 size)
{
	enforcer_display_hit (_T("CHECK from "), m68k_getpc (), addr);
	return 0;
}


/*************************************************************
enable the enforcer like support, maybe later this make MMU
exceptions so enforcer can use it. Returns 1 if enforcer
is enabled
*************************************************************/
int enforcer_enable (int enfmode)
{
	extern addrbank chipmem_bank, dummy_bank;
	enforcermode = enfmode;
	if (!enforcer_installed) {
		saved_dummy_lget = dummy_bank.lget;
		saved_dummy_wget = dummy_bank.wget;
		saved_dummy_bget = dummy_bank.bget;
		saved_dummy_lput = dummy_bank.lput;
		saved_dummy_wput = dummy_bank.wput;
		saved_dummy_bput = dummy_bank.bput;
		saved_chipmem_lget = chipmem_bank.lget;
		saved_chipmem_wget = chipmem_bank.wget;
		saved_chipmem_bget = chipmem_bank.bget;
		saved_chipmem_lput = chipmem_bank.lput;
		saved_chipmem_wput = chipmem_bank.wput;
		saved_chipmem_bput = chipmem_bank.bput;
		saved_chipmem_xlate = chipmem_bank.xlateaddr;
		saved_chipmem_check = chipmem_bank.check;

		dummy_bank.lget = dummy_lget2;
		dummy_bank.wget = dummy_wget2;
		dummy_bank.bget = dummy_bget2;
		dummy_bank.lput = dummy_lput2;
		dummy_bank.wput = dummy_wput2;
		dummy_bank.bput = dummy_bput2;
		chipmem_bank.lget = chipmem_lget2;
		chipmem_bank.wget = chipmem_wget2;
		chipmem_bank.bget = chipmem_bget2;
		chipmem_bank.lput = chipmem_lput2;
		chipmem_bank.wput = chipmem_wput2;
		chipmem_bank.bput = chipmem_bput2;
		chipmem_bank.xlateaddr = chipmem_xlate2;
		chipmem_bank.check = chipmem_check2;

		enforcer_installed = 1;
	}
	return 1;
}

/*************************************************************
Disable Enforcer like support
*************************************************************/
int enforcer_disable (void)
{
	if (enforcer_installed) {
		dummy_bank.lget = saved_dummy_lget;
		dummy_bank.wget = saved_dummy_wget;
		dummy_bank.bget = saved_dummy_bget;
		dummy_bank.lput = saved_dummy_lput;
		dummy_bank.wput = saved_dummy_wput;
		dummy_bank.bput = saved_dummy_bput;
		chipmem_bank.lget = saved_chipmem_lget;
		chipmem_bank.wget = saved_chipmem_wget;
		chipmem_bank.bget = saved_chipmem_bget;
		chipmem_bank.lput = saved_chipmem_lput;
		chipmem_bank.wput = saved_chipmem_wput;
		chipmem_bank.bput = saved_chipmem_bput;
		chipmem_bank.xlateaddr = saved_chipmem_xlate;
		chipmem_bank.check = saved_chipmem_check;

		enforcer_installed = 0;
	}
	return 1;
}

#endif // AHI