TABLE OF CONTENTS
WHDLoad/--Overview--
WHDLoad/resload_Abort
WHDLoad/resload_Control
WHDLoad/WHDLTAG_CBAF_SET
WHDLoad/WHDLTAG_CBSWITCH_SET
WHDLoad/WHDLTAG_IOERR_GET
WHDLoad/resload_CRC16
WHDLoad/resload_Decrunch
WHDLoad/resload_Delay
WHDLoad/resload_Delta
WHDLoad/resload_DeleteFile
WHDLoad/resload_DiskLoad
WHDLoad/resload_DiskLoadDev
WHDLoad/resload_Examine
WHDLoad/resload_ExNext
WHDLoad/resload_FlushCache
WHDLoad/resload_GetCustom
WHDLoad/resload_GetFileSize
WHDLoad/resload_GetFileSizeDec
WHDLoad/resload_ListFiles
WHDLoad/resload_LoadFile
WHDLoad/resload_LoadFileDecrunch
WHDLoad/resload_LoadFileOffset
WHDLoad/resload_LoadKick
WHDLoad/resload_Patch
WHDLoad/resload_PatchSeg
WHDLoad/resload_ProtectRead
WHDLoad/resload_ProtectReadWrite
WHDLoad/resload_ProtectRemove
WHDLoad/resload_ProtectSMC
WHDLoad/resload_ProtectWrite
WHDLoad/resload_Relocate
WHDLoad/resload_SaveFile
WHDLoad/resload_SaveFileOffset
WHDLoad/resload_SetCACR
WHDLoad/resload_SetCPU
WHDLoad.Slave/--Overview--
WHDLoad/--Overview--
The calling conventions for all functions are similar to the OS-Library
concept. Parameters are provided in registers (except for "resload_Abort"),
return codes come in D0 (on some functions also in D1). After a function call
the registers D0-D1/A0-A1 are destroyed (D0,D1 may contain a return code).
They are called scratch registers. All other registers are preserved. The base
of the JMP tower in WHDLoad is similar to a Library-Base. In difference to the
OS the base must not be loaded in A6 on calling a function, but it is
recommended to call all functions relative to a address register like:
move.l (_resload,pc),a5
jsr (resload_Decrunch,a5)
During the execution of resload functions interrupts are normally allowed. For
some internal operations they will be disabled for a short time. If the option
NoResInt/S is used the interrupts are disabled the whole time.
The resload functions will not use the registers A5 and A6 while interrupts are
allowed. Therefore interrupts of the installed program may assume that these
both registers contain previously set values. This is not true for all other
registers. If the interrupts assume constants in other registers (e.g. A4)
either the interrupt code must be patched accordingly or the interrupts must be
disabled before calling resload functions.
If option NoResInt/S is used all registers except D0/D1/A0/A1 remain unchanged
for interrupt code (but this option is for testing purposes only!).
The resload base is over given in A0 on calling the Slave first via
ws_GameLoader (see chapter WHDLoad.Slave/--Overview--).
All file names used with resload functions must be relative and must not
access any higher-level directories. That means file names must not start or
end with a slash ("/"), must not contain multiple slashes ("//") and must not
contain a colon (":"). These restrictions are enforced starting WHDLoad v16.9.
Earlier versions of WHDLoad will accept all names at the loss of being able to
preload them.
some keywords used in this document:
Slave file which contains the interface code
(see section WHDLoad.Slave/--Overview--)
BaseMem the memory which is used by the installed program, because
this memory is always Chip-memory and starts at address
$00000000, BaseMem is at the same time the size and the end
address of the used Chip-memory; BaseMem is specified in the
Slave-structure in field "ws_BaseMemSize"
ExpMem is the expansions memory, a extra memory area which can
optionally requested by the Slave-structure, it may be
Chip- or Fast-memory dependently on what is available
ExpMem is supported starting WHDLoad version 8
Disk Image a floppy disk stored as a file on hard disk
logical values used for return codes (see dos/dos.i):
TRUE = -1 (or better <>0)
FALSE = 0
WHDLoad/resload_Abort
NAME
resload_Abort -- quit and return to operating system
SYNOPSIS
resload_Abort( success, primary, secondary)
(a7) (4,a7) (8,a7)
ULONG ULONG ULONG
FUNCTION
This aborts and terminates the installed program and cause WHDLoad to
return to the operating system.
INPUTS
success - the reason for aborting
one of TDREASON_#? defined in the include file "whdload.i"
depending on this value WHDLoad continues different
TDREASON_OK
a normal exit will performed
TDREASON_DEBUG
WHDLoad will create dump files (.whdl_dump, .whdl_memory,
.whdl_register) and exit
TDREASON_#? (except the above)
WHDLoad will show an requester which displays the reason
of aborting and requests the user to choose between
"Quit", "Restart" and "Make CoreDump"
primary - the primary return code further describing the reason of
aborting
TDREASON_DELETEFILE, TDREASON_DISKLOAD, TDREASON_DISKLOADDEV,
TDREASON_DOSLIST, TDREASON_DOSREAD, TDREASON_DOSWRITE
dos or trackdisk error code
TDREASON_DEBUG
program counter (so it can by written to the dump files)
TDREASON_OSEMUFAIL
name of the filed subsystem
TDREASON_FAILMSG
message to display
TDREASON_MUSTNTSC, TDREASON_MUSTPAL, TDREASON_MUSTREG,
TDREASON_OK, TDREASON_REQ68020, TDREASON_REQAGA,
TDREASON_WRONGVER
unused (can be omitted)
secondary - the secondary return code further describing the reason of
aborting
TDREASON_DELETEFILE, TDREASON_DOSREAD, TDREASON_DOSWRITE
filename
TDREASON_DISKLOAD
disk number
TDREASON_DOSLIST
name of directory scanned
TDREASON_DEBUG
status register (so it can by written to the dump files)
TDREASON_OSEMUFAIL
error number, depending on the primary return code
TDREASON_DISKLOADDEV, TDREASON_FAILMSG, TDREASON_MUSTNTSC,
TDREASON_MUSTPAL, TDREASON_MUSTREG, TDREASON_OK,
TDREASON_REQ68020, TDREASON_REQAGA, TDREASON_WRONGVER
unused (can be omitted)
EXAMPLE
to simply quit:
...
; primary and secondary are not needed with TDREASON_OK
move.l #TDREASON_OK,-(a7)
move.l (_resload,pc),a0
jmp (resload_Abort,a0)
to quit because reading of a file has failed:
...
move.l a0,-(a7) ;a0 = filename
move.l d0,-(a7) ;d0 = DOS error code
move.l #TDREASON_DOSREAD,-(a7)
move.l (_resload,pc),-(a7)
add.l #resload_Abort,(a7)
rts
RESULT
nothing because WHDLoad will never return from this call
BUGS
NOTE
This routine is the only one which must be called via JMP and not JSR
because the parameters are located on the stack (that has the
advantage that when aborting with TDREASON_DEBUG all registers can be
preserved and written to the dump files by WHDLoad for later
diagnostics)
SEE ALSO
example Slave sources provided with the WHDLoad developer package
WHDLoad/resload_Control
NAME
resload_Control
SYNOPSIS
success = resload_Control(tags)
D0 A0
BOOL STRUCT
FUNCTION
control function of WHDLoad, allows to get and set various variables
concerning the software and hardware configuration and to control the
behavior of some WHDLoad operations
INPUTS
tags - pointer to a table of tag items
the following items are currently supported:
WHDLTAG_ATTNFLAGS_GET - gets the AttnFlags describing the current
CPU, FPU and MMU, the returned value is
similar to execbase.AttnFlags but not equal
because WHDLoad uses some additional bits,
the Slave is only allowed to the use the
defines from the standard include file
"exec/execbase.i" for testing
WHDLTAG_BUILD_GET - gets WHDLoad build number
WHDLTAG_BUTTONWAIT_GET - returns -1 if WHDLoad option ButtonWait/S
has been enabled, otherwise returns 0
WHDLTAG_CBAF_SET - sets a function which will be executed when
an access fault exception occurs (see
section WHDLoad/WHDLTAG_CBAF_SET for further
informations)
WHDLTAG_CBSWITCH_SET - sets a function which will be executed when
WHDLoad switches from the operating system
to the installed program (see section
WHDLoad/WHDLTAG_CBSWITCH_SET for further
informations)
WHDLTAG_CHKBLTHOG - enables the 'dmacon.blthog' check, requires
a active Snoop option and WHDLoad v13
WHDLTAG_CHKBLTSIZE - enables the 'blitter size' check, requires a
active Snoop option and WHDLoad v13
WHDLTAG_CHKBLTWAIT - enables the 'blitter wait' check, requires a
active Snoop option and WHDLoad v13
WHDLTAG_CHKCOLBST - enables the 'bplcon0.color' check, requires
a active Snoop option and WHDLoad v13
WHDLTAG_CHKCOPCON - enables the 'copcon' check, requires
a active Snoop option and WHDLoad v15.2
WHDLTAG_CHIPREVBITS_GET - gets the ChipRevBits describing the current
custom chips, see standard include file
"graphics/gfxbase.i" for further infos
WHDLTAG_CUSTOM1_GET
WHDLTAG_CUSTOM2_GET
WHDLTAG_CUSTOM3_GET
WHDLTAG_CUSTOM4_GET
WHDLTAG_CUSTOM5_GET - returns numerical value of WHDLoad option
Custom1/N .. Custom5/N
WHDLTAG_DBGADR_SET - sets a base address for debugging, this is
only used for error messages by WHDLoad, on
error it will additionally output the offset
of the faulted address to this base, useful
if you have program code somewhere (e.g. in
ExpMem) and like to know at which offset in
the program it has happen (without
calculating it manually)
requires WHDLoad v14.5
WHDLTAG_DBGSEG_SET - the same as WHDLTAG_DBGADR_SET but instead
a memory address a BCPL pointer to a
dos.library Segment is given, on error
WHDLoad will display the offset in the
relocated executable, like you would see
it in a dis/reassembler
requires WHDLoad v15.0
WHDLTAG_ECLOCKFREQ_GET - gets the EClockFrequency, which is the
frequency the custom chips operate on, the
value is taken from the execbase (see
standard include file "exec/execbase.i")
WHDLTAG_LANG_GET - get language provided by lowlevel.library,
see libraries/lowlevel.i for further infos,
requires WHDLoad v13.2
WHDLTAG_IOERR_GET - gets the dos error code of a previously
called resload function
WHDLTAG_KEYTRANS_GET - get pointer to a table for 'rawkey to ascii'
conversion, the table has a length of 512
bytes and contains 4 sub tables, first 128
bytes representing the keys pressed without
any modifier, then 128 bytes with Shift,
then 128 bytes with Alt and last 128 Bytes
with Shift and Alt
the tables are created from the actual
system keymap, dead keys are mapped like
pressing Space afterwards, keys resulting in
multibyte characters (F-Keys, Esc, ...) are
set to 0 in the tables
WHDLTAG_MONITOR_GET - gets the used monitor/video mode, the
returned value is one of NTSC_MONITOR_ID and
PAL_MONITOR_ID (defined in the standard
include file "graphics/modeid.i"), the
WHDLoad options PAL/S and NTSC/S are
affecting the monitor/video mode
WHDLTAG_REVISION_GET - gets WHDLoad minor version number
WHDLTAG_TIME_GET - gets current time and date, returned will be
a pointer to a filled whdload_time structure
which is described in the include file
"whdload.i"
WHDLTAG_VERSION_GET - gets WHDLoad major version number
EXAMPLE
check if current CPU is at least an MC68020:
...
clr.l -(a7) ;TAG_DONE
clr.l -(a7) ;data to fill
move.l #WHDLTAG_ATTNFLAGS_GET,-(a7)
move.l a7,a0
move.l (_resload,pc),a2
jsr (resload_Control,a2)
move.w (6,a7),d0 ;D0 = AttnFlags
lea (12,a7),a7 ;restore sp
btst #AFB_68020,d0
beq .no68020
...
get video mode and CPU:
...
lea (_tags,pc),a0
move.l (_resload,pc),a2
jsr (resload_Control,a2)
move.l (_mon,pc),d0 ;D0 = video mode
cmp.l #NTSC_MONITOR_ID,d0
beq .ntsc
...
_tags dc.l WHDLTAG_MONITOR_GET
_mon dc.l 0
dc.l WHDLTAG_ATTNFLAGS_GET
dc.w 0 ;padding
_attn dc.w 0
dc.l 0 ;TAG_DONE
RESULT
success is true if all items in the taglist has been successfully
processed
BUGS
NOTE
requires ws_Version >= 5
SEE ALSO
WHDLoad/WHDLTAG_CBAF_SET
NAME
WHDLTAG_CBAF_SET
SYNOPSIS
to be used with resload_Control
cont, adr, data = CBAF(mode, size, pc, adr, data/regs)
D0 A1 A2 D0 D1 A0 A1 A2
LONG APTR APTR LONG LONG APTR APTR APTR
FUNCTION
Using this tag a function can be set which will executed when an
access fault exception occurs which is not handled by WHDLoad itself.
It may be used to locate specific accesses in conjunction with
resload_Protect and to walk around invalid accesses during the
development process.
on the 68030 all access faults can be caught except:
- instruction stream faults
- faults caused by WHDLoad's blitwait and blitsize checks
on the 68040/60 only these access faults can be caught:
- faults caused by resload_Protect
The routine being set must not change any registers except the ones
holding a return value. The routine must return via RTS. On entering
the routine all interrupts are disabled (sr=$27xx).
INPUTS
mode - transfer mode of the faulted access
0 - read
1 - modify (only 68060)
2 - write
size - operand size of the attempted access
1 - Byte
2 - Word
4 - LongWord
pc - program counter of the instruction which has faulted
(warning: on the 68040/60 this sometimes points the instruction
after the one which has faulted, read the appropriate
microprocessor user manual for further informations)
adr - the address which has been attempted to access
data - on the 68030 valid only on write operations, the given memory
address contains the data which has been tried to write
on the 68040/60 it contains a pointer to memory where the
registers D0-A6 are stored
RESULT
cont - how to continue
0 - terminate, WHDLoad will show a requester notifying the
access fault
1 - proceed, the faulted access will be emulated by the
handler inside WHDLoad
adr - only on 68030: in case of cont=proceed the address which will be
accessed
data - only on 68030: in case of cont=proceed and mode=write a pointer
to the data which will be written
EXAMPLE
If you want to get informed at which point the installed program
writes the value 42 to the address $BABE use the following code:
...
clr.l -(a7) ;TAG_DONE
pea (_af,pc) ;function
move.l #WHDLTAG_CBAF_SET,-(a7)
move.l a7,a0
move.l (_resload,pc),a2
jsr (resload_Control,a2)
lea (12,a7),a7 ;restore sp
moveq #2,d0
lea ($BABE),a0
jsr (resload_ProtectWrite,a2) ;protect area
...
_af cmp.l #$BABE,a1 ;correct address ?
bne .term
cmp.w #2,d1 ;size
bne .term
cmp.w #42,(a2) ;a2 is only valid on
;68030!
beq .term
moveq #1,d0 ;proceed
rts
.term moveq #0,d0 ;terminate
rts
EXAMPLE
If want you to redirect an access to $24 to the address $300, use the
following code (works only on 68030!):
...
clr.l -(a7) ;TAG_DONE
pea (_af,pc) ;function
move.l #WHDLTAG_CBAF_SET,-(a7)
move.l a7,a0
move.l (_resload,pc),a2
jsr (resload_Control,a2)
lea (12,a7),a7 ;restore sp
moveq #4,d0
lea ($24),a0
jsr (resload_ProtectWrite,a2) ;protect area
...
_af cmp.l #$24,a1 ;correct address ?
bne .term
lea ($300),a1
moveq #1,d0 ;proceed
rts
.term moveq #0,d0 ;terminate
rts
BUGS
fully supported is only the 68030, limited support for 68040/60
NOTE
requires ws_Version >= 9
on the 68040 it's supported starting WHDLoad 17.0
on the 68060 it's supported starting WHDLoad 16.1
the parameter a2=regs on the 68060 is supported since WHDLoad 16.4
MUST not be used in public releases, use it during development process
only
SEE ALSO
resload_Control
WHDLoad/WHDLTAG_CBSWITCH_SET
NAME
WHDLTAG_CBSWITCH_SET
SYNOPSIS
to be used with resload_Control
CBSWITCH()
FUNCTION
Using this tag a routine can be set which will executed each time
WHDLoad switches from the operating system to the installed program.
Such a routine is sometimes necessary because during the switch
between the installed program and the operating system some hardware
registers are modified by the operating system.
Known registers getting modified are cop2lc, bltafwm and bltalwm (maybe
there are more of them).
The routine must not change any registers, must not use any stack and
has to return via "jmp (a0)". At execution time of the routine all
interrupts and DMAs are disabled and the memory setup of the installed
program is active.
INPUTS
pointer to the routine to execute during switch, a value equal 0
disables the execution of a routine
EXAMPLE
...
clr.l -(a7) ;TAG_DONE
pea (_cbswitch,pc) ;function
move.l #WHDLTAG_CBSWITCH_SET,-(a7)
move.l a7,a0
move.l (_resload,pc),a2
jsr (resload_Control,a2)
lea (12,a7),a7 ;restore sp
...
_cbswitch move.l (_c2,pc),(_custom+cop2lc)
jmp (a0)
_cb2 dc.l $10e80
RESULT
none
BUGS
NOTE
requires ws_Version >= 7
SEE ALSO
resload_Control
WHDLoad/WHDLTAG_IOERR_GET
NAME
WHDLTAG_IOERR_GET
SYNOPSIS
to be used with resload_Control
FUNCTION
This tag can be used to get the DOS error code of the last called
resload function. All resload functions except resload_Control will
set/reset this error code.
Two resload functions are special in that way:
resload_GetFileSize
If a file with the specified name cannot be opened via
dos.Open, the error code will be set to the value returned
from dos.IoErr. So the error code may contain values like
ERROR_OBJECT_NOT_FOUND, ERROR_OBJECT_WRONG_TYPE,
ERROR_READ_PROTECTED or similar (see NDK include file
dos/dos.i). The error code can be used to distinguish between
a file with the size of 0 and a nonexistent file.
resload_ListFiles
If the specified buffer to fill is not large enough to hold
all file names from the scanned directory, the error code will
be set to ERROR_NO_FREE_STORE.
INPUTS
none
EXAMPLE
...
clr.l -(a7) ;TAG_DONE
clr.l -(a7) ;data to fill
move.l #WHDLTAG_IOERR_GET,-(a7)
move.l a7,a0
move.l (_resload,pc),a2
jsr (resload_Control,a2)
move.l (4,a7),d0 ;D0 = IoErr
lea (12,a7),a7 ;restore sp
...
RESULT
none
BUGS
NOTE
requires ws_Version >= 8
SEE ALSO
resload_Control, resload_GetFileSize, resload_ListFiles
WHDLoad/resload_CRC16
NAME
resload_CRC16 -- calculate ANSI conform 16 bit CRC checksum
SYNOPSIS
checksum = resload_CRC16(length,address)
D0 D0 A0
UWORD ULONG APTR
FUNCTION
calculate ANSI conform 16 bit CRC checksum
mostly used to difference between various program/data versions
INPUTS
length - length of area to calculate over
address - pointer to area
EXAMPLE
...
lea $1000,a0 ;at address $1000
move.l #256,d0 ;up to address $1100
move.l (_resload,pc),a2
jsr (resload_CRC16,a2)
cmp.w #$f2b7,d0
bne .false_version
...
RESULT
checksum - 16 bit CRC
BUGS
NOTE
requires ws_Version >= 3
SEE ALSO
WHDLoad/resload_Decrunch
NAME
resload_Decrunch -- uncompress data in memory
SYNOPSIS
size = resload_Decrunch(source, destination)
D0 A0 A1
ULONG APTR APTR
FUNCTION
This unpacks compressed data in memory. Known compressed data formats
are RNC1, RNC2, IMP!, ATN!, TPWM and Cr[Mm][!2].
If the data source doesn't point to a known compressed format size=0
will be returned. Else the data will be unpacked to the destination
and the size of the decompressed data is returned.
Source and destination can be equal. In that case the packed data will
be overwritten.
RNC1: Rob Northen compressor - emphasis on packed size
Supported is the old and the new format. Both formats using the
same id but different file formats and compressing algorithms.
The function uses some heuristic checks to determine the
correct format. The decompressor for the new common format is
highly optimized and contains a separate routine for 68000/10
and one for 68020+. On 68060 it's faster than the Imploder
decompressor.
RNC2: Rob Northen compressor - emphasis on unpacking speed
It's the fastest supported decompressor.
IMP!: Imploder (FImp)
The packed data data must not overlap the destination. The
destination must be either equal the source or outside the
source data. In difference to the original explode routine
resload_Decrunch does not destroy the source data (if source
is not equal destination).
ATN!: identical to IMP! only id is different
TPWM: Turbo Packer Wolfgang Mayerle
Supported starting WHDLoad v11. Because the file header does
not contain the length of the packed data there is no
integrity check performed.
Cr[Mm][!2]: Crunch-Mania by Thomas Schwarz
Supported starting WHDLoad v17. The packed source data must be
located on a word aligned address for 68000/10 compatibility!
All decompression routines have been modified to not modify the
registers A5 and A6 and to use nearly no stack space.
All decompression routines are performing a check if the decompression
was successful. On a failure the installed program will be terminated
and WHDLoad will display a message telling this.
INPUTS
source - address of source in memory
destination - address of destination in memory (can be equal to source)
EXAMPLE
RESULT
size - the size of the uncompressed data or 0 if is not compressed
with a known format
BUGS
NOTE
the routine performs automatically a resload_FlushCache before
returning
SEE ALSO
resload_LoadFileDecrunch
WHDLoad/resload_Delay
NAME
resload_Delay -- wait some time or user action
SYNOPSIS
resload_Delay(time)
D0
ULONG
FUNCTION
Wait the specified time or until a button/key is pressed. All possible
buttons (LMB, MMB, RMB) of both controllers (port 0/1) and the keyboard
is checked. After the time runs out or something has been pressed the
function waits until the pressed controller button has been released.
But it does not wait for a keyboard key up.
The wait routine is based on the raster beam. But checks the current
display and therefore waits the correct time on PAL and NTSC displays.
INPUTS
time - time to wait in 1/10 seconds
EXAMPLE
...
moveq #30,d0 ;3 seconds
move.l (_resload,pc),a2
jsr (resload_Delay,a2)
...
RESULT
nothing, all registers are preserved
BUGS
NOTE
in difference to most others resload_#? function this routine is
granted to preserve all registers
requires ws_Version >= 8
SEE ALSO
WHDLoad/resload_DeleteFile
NAME
resload_Delete -- delete file/directory
SYNOPSIS
success,errorcode = resload_DeleteFile(name)
D0 D1 A0
BOOL ULONG CPTR
FUNCTION
This deletes the file or directory with the specified name.
A directory must be empty for deletion.
If there are multiple data directories used the object to delete
must be located in the first data directory. Otherwise deleting
will fail with a DOS error code ERROR_OBJECT_NOT_FOUND.
INPUTS
name - name of the file/directory to delete
EXAMPLE
...
lea (_name,pc),a0
move.l (_resload,pc),a2
jsr (resload_DeleteFile,a2)
...
_name dc.b "C/WHDLoad",0
RESULT
success - TRUE on success
errorcode - 0 on success
otherwise a DOS error code from dos.IoErr()
if WHDLF_NoError is set, the function only returns on success
BUGS
NOTE
requires ws_Version >= 8
SEE ALSO
WHDLoad/resload_Delta
NAME
resload_Delta -- apply WDelta file
SYNOPSIS
resload_Delta(src, dest, delta)
A0 A1 A2
APTR APTR APTR
FUNCTION
Applies the differences provided via the delta data onto the source
data and creates the destination data.
WDelta is a tool to calculate a binary differences file from two data
files (like scompare/spatch). It can be found on aminet
(http://main.aminet.net/util/cli/WDelta.lha).
This function can be used to support different versions of data or
program files by converting them into one single version.
INPUTS
src - source data
dest - destination memory
delta - wdelta data
EXAMPLE
...
lea ($10000),a0 ;source
lea ($400),a1 ;destination
lea ($40000),a2 ;wdelta
move.l (_resload,pc),a3
jsr (resload_Delta,a3)
...
RESULT
BUGS
NOTE
The source and the destination will be CRC checked.
If an error occurs WHDLoad will quit with an appropriate requester.
requires ws_Version >= 11
SEE ALSO
WHDLoad/resload_DiskLoad
NAME
resload_DiskLoad -- load part from a disk image
SYNOPSIS
success,errorcode = resload_DiskLoad(offset,size,diskno,dest)
D0 D1 D0 D1 D2 A0
BOOL ULONG ULONG ULONG UBYTE APTR
FUNCTION
Loads part from a disk image as specified by the parameters.
The name of the disk images is expected as 'disk.' followed by the
number of the disk (e.g. 'Disk.1').
The size of the disk images is variable. An attempt to read data
outside of the disk image will result in a DOS error
ERROR_SEEK_ERROR.
INPUTS
offset - offset in disk image (relative to the beginning)
size - amount of bytes to read
diskno - disk number
dest - destination address
EXAMPLE
...
move.l #880*512,d0 ;from block 880
move.l #2*512,d1 ;2 blocks
moveq #1,d2 ;disk 1
lea $80000,a0 ;destination
move.l (_resload,pc),a2
jsr (resload_LoadDisk,a2)
...
RESULT
success - TRUE on success
errorcode - 0 on success
otherwise a DOS error code from dos.IoErr()
if WHDLF_NoError is set, the function only returns on success
BUGS
NOTE
The routine performs automatically a resload_FlushCache before
returning.
SEE ALSO
resload_LoadFileOffset
WHDLoad/resload_DiskLoadDev
NAME
resload_DiskLoadDev -- load part from a floppy disk
SYNOPSIS
success,errorcode = resload_DiskLoadDev(offset, size, dest, tags)
D0 D1 D0 D1 A0 A1
BOOL ULONG ULONG ULONG UBYTE STRUCT
FUNCTION
Loads a given amount of data from a floppy device.
INPUTS
offset - offset on the disk (must be a multiple of 512 bytes)
size - amount of bytes to read (must be a multiple of 512 bytes)
dest - destination address (must be aligned to 512 bytes)
tags - pointer to a taglist, starting WHDLoad version 16.0
there is one supported tag WHDLTAG_TDUNIT which
specifies the trackdisk.device unit to read from, default
is unit 0 (DF0:)
EXAMPLE
...
move.l #880*512,d0 ;from block 880
move.l #2*512,d1 ;2 blocks
lea $80000,a0 ;destination
sub.l a1,a1 ;tag list
move.l (_resload,pc),a2
jsr (resload_LoadDisk,a2)
...
RESULT
success - TRUE on success
errorcode - 0 on success
otherwise a trackdisk error code
if WHDLF_NoError is set, the function only returns on success
BUGS
NOTE
requires ws_Version >= 2
At the moment all parameters (offset, size, address) must be aligned
to 512 bytes due restrictions of trackdisk.device.
The routine performs automatically a resload_FlushCache before
returning.
SEE ALSO
WHDLoad/resload_Examine
NAME
resload_Examine -- get informations about a file or directory
SYNOPSIS
success,errorcode = resload_Examine(name, FileInfoBlock)
D0 D1 A0 A1
BOOL ULONG CPTR APTR
FUNCTION
Fills the supplied FileInfoBlock with informations about the
specified file or directory. See NDK include file dos/dos.i for the
structure of the FileInfoBlock.
INPUTS
name - name of the object to get info about
fib - store pool of 260 bytes for the infos
EXAMPLE
...
lea (_filename,pc),a0
sub.l #fib_SIZEOF,a7
move.l a7,a1
move.l (_resload,pc),a2
jsr (resload_Examine,a2)
...
add.l #fib_SIZEOF,a7
...
RESULT
success - is true (-1) on success and false (0) on failure
errorcode - contains DOS error code (e.g. ERROR_OBJECT_NOT_FOUND)
BUGS
Relative path names (starting/ending with '/' or containing '//') are
not supported. The name must also not contain a ':'.
The fib_Size will be incorrect if the file is more than two times
compressed using XPK or compressed using XPK and afterwards encrypted
using XPK.
NOTE
requires ws_Version >= 15
SEE ALSO
resload_GetFileSize, resload_GetFileSizeDec, resload_ExNext
WHDLoad/resload_ExNext
NAME
resload_ExNext -- get informations about next directory entry
SYNOPSIS
success,errorcode = resload_Examine(FileInfoBlock)
D0 D1 A0
BOOL ULONG APTR
FUNCTION
Fills the supplied FileInfoBlock with informations about the next
directory entry. The FileInfoBlock must be previously initialized by
a call to resload_Examine.
INPUTS
fib - store pool of 260 bytes for the infos
EXAMPLE
...
lea (_dirname,pc),a0
sub.l #fib_SIZEOF,a7
move.l a7,a1
move.l (_resload,pc),a2
jsr (resload_Examine,a2)
tst.l d0
beq .end
.next move.l a7,a0
jsr (resload_ExNext,a2)
tst.l d0
beq .end
...
bra .next
.end add.l #fib_SIZEOF,a7
...
RESULT
success - is true (-1) on success and false (0) on failure
errorcode - if there are no more entries left it contains
ERROR_NO_MORE_ENTRIES
BUGS
The fib_Size will be incorrect if the file is more than two times
compressed using XPK or compressed using XPK and afterwards encrypted
using XPK.
NOTE
requires ws_Version >= 15
SEE ALSO
resload_Examine
WHDLoad/resload_FlushCache
NAME
resload_FlushCache -- clear CPU caches
SYNOPSIS
resload_FlushCache()
FUNCTION
clears all CPU caches
INPUTS
EXAMPLE
RESULT
BUGS
NOTE
In difference to most other resload_#? functions this routine is
granted to preserve all registers.
It's safe to call this routine from User and Supervisor mode and
independent of the actual CPU type (also on 68000/010).
It uses the CACR on 68020/30 and a "cpusha bc" on 68040/60.
SEE ALSO
resload_SetCPU
WHDLoad/resload_GetCustom
NAME
resload_GetCustom -- get Custom argument
SYNOPSIS
success = resload_GetCustom(buflen, reserved, buffer)
D0 D0 D1 A0
ULONG ULONG ULONG CPTR
FUNCTION
Get the string which has been specified via the Custom/S option.
The buffer is filled as far as possible. If buffer was not large
enough false will be returned.
INPUTS
buflen - size of buffer
reserved - currently not used, must be set to 0
buffer - memory area to fill
EXAMPLE
...
move.l #$100,d0
moveq #0,d1
lea ($1000),a0
move.l (_resload,pc),a2
jsr (resload_GetCustom,a2)
tst.l d0
beq .error
...
RESULT
success - zero if buffer was too small
BUGS
NOTE
requires ws_Version >= 15
SEE ALSO
WHDLoad/resload_GetFileSize
NAME
resload_GetFileSize -- get size of a file
SYNOPSIS
size = resload_GetFileSize(name)
D0 A0
ULONG CPTR
FUNCTION
Gets size of a file (check if a file exists).
To distinguish between a file with a size of 0 and a nonexistent
file the tag WHDLTAG_IOERR_GET must be used in conjunction with
resload_Control afterwards.
INPUTS
name - name of the file to get the size of
EXAMPLE
...
lea (_filename,pc),a0
move.l (_resload,pc),a2
jsr (resload_GetFileSize,a2)
tst.l d0
bne .file_exist
clr.l -(a7) ;TAG_DONE
clr.l -(a7) ;data to fill
move.l #WHDLTAG_IOERR_GET,-(a7)
move.l a7,a0
jsr (resload_Control,a2)
move.l (4,a7),d0
lea (12,a7),a7 ;restore sp
beq .file_exist
...
RESULT
size - the size of the file, 0 if does not exist
BUGS
NOTE
This routine returns the file size obtained from the filesystem. If the
file is compressed and is loaded later via resload_LoadFileDecrunch the
loaded file size will differ!
SEE ALSO
resload_Control, resload_GetFileSizeDec, resload_LoadFile,
resload_LoadFileDecrunch
WHDLoad/resload_GetFileSizeDec
NAME
resload_GetFileSizeDec -- get size of a packed file
SYNOPSIS
size = resload_GetFileSizeDec (name)
D0 A0
ULONG CPTR
FUNCTION
Gets size of a packed file (check if a file exists).
The routine knows about the same decrunchers as resload_Decrunch.
To distinguish between a file with a size of 0 and a nonexistent
file the tag WHDLTAG_IOERR_GET must be used in conjunction with
resload_Control afterwards.
INPUTS
name - name of the file to get the size of
EXAMPLE
...
lea (_filename,pc),a0
move.l (_resload,pc),a2
jsr (resload_GetFileSizeDec,a2)
tst.l d0
beq .file_not_exist
...
RESULT
size - the size of the file, 0 if does not exist
BUGS
NOTE
requires ws_Version >= 11
SEE ALSO
resload_Control, resload_GetFileSize, resload_LoadFile,
resload_LoadFileDecrunch
WHDLoad/resload_ListFiles
NAME
resload_ListFiles -- list filenames of a directory
SYNOPSIS
amount,errorcode = resload_ListFiles(buffersize, name, buffer)
D0 D1 D0 A0 A1
ULONG ULONG ULONG CPTR APTR
FUNCTION
Writes the names of all files in the specified directory to the
buffer. The file names are separated with a 0 character.
Only files are listed, directories are skipped.
If the buffer to fill is not large enough to hold all names the
routine fills it as far as possible. The tag WHDLTAG_IOERR_GET in
conjunction with resload_Control can be used afterwards to check if
all file names have fit into the buffer.
If multiple data directories are used, only the first data directory
will be scanned.
INPUTS
buffersize - the size of the buffer
name - the name of the directory to scan
buffer - pointer to the buffer to fill (up to WHDLoad v16.8 the
buffer must be located inside the Slave, from WHDLoad
v16.9 on it can also be located in ExpMem)
EXAMPLE
...
move.l #_bufend-_buf,d0
lea (_savepath,pc),a0
lea (_buf,pc),a1
move.l (_resload,pc),a2
jsr (resload_ListFiles,a2)
...
_buf ds.b 1000
_bufend
_savepath dc.b "save",0
RESULT
amount - amount of listed files in the buffer
errorcode - 0 on success
otherwise a DOS error code from dos.IoErr()
if WHDLF_NoError is set, the function only returns on success
BUGS
NOTE
A call to this resload function always causes a switch to the
operating system because the informations to provide are not
cached. To avoid this switch resload_Examine and resload_ExNext
can be used (but will require some additional memory for the
Directory PreLoad).
SEE ALSO
resload_Control
WHDLoad/resload_LoadFile
NAME
resload_LoadFile -- load file into memory
SYNOPSIS
length,errorcode = resload_LoadFile(name, address)
D0 D1 A0 A1
ULONG ULONG CPTR APTR
FUNCTION
Loads the file to the specified memory address.
INPUTS
name - name of the file to load
address - memory address to load the file on
EXAMPLE
...
lea (_filename),a0 ;name
lea $1000.w,a1 ;destination
move.l (_resload,pc),a2
jsr (resload_LoadFile,a2)
...
RESULT
length - the size of the loaded file, or 0 on error
errorcode - 0 on success
otherwise a DOS error code from dos.IoErr()
if WHDLF_NoError is set, the function only returns on success
BUGS
NOTE
The routine performs automatically a resload_FlushCache before
returning.
SEE ALSO
resload_LoadFileDecrunch, resload_LoadFileOffset
WHDLoad/resload_LoadFileDecrunch
NAME
resload_LoadFileDecrunch -- load file and uncompress
SYNOPSIS
length,errorcode = resload_LoadFileDecrunch(name, address)
D0 D1 A0 A1
ULONG ULONG CPTR APTR
FUNCTION
Loads the specified file into memory and unpack it if compressed in a
supported format. Supported are the same formats as with
resload_Decrunch.
Using this routine instead of resload_LoadFile easily allows it to add
support for compressed data files to a installed program. Because of
the transparent decompression the installed program will not notify if
the files loaded were compressed on disk or not. The only thing which
must be considered is that files which are written using
resload_SaveFileOffset or loaded via resload_LoadFileOffset must not
be compressed.
INPUTS
name - name of file to load
address - memory address to load the file on
EXAMPLE
...
lea (_filename),a0 ;name
lea $1000.w,a1 ;destination
move.l (_resload,pc),a2
jsr (resload_LoadFileDecrunch,a2)
...
RESULT
length - the size of the loaded file
if an error occurs this is 0
errorcode - 0 on success
otherwise a DOS error code from dos.IoErr()
if WHDLF_NoError is set, the function only returns on success
BUGS
NOTE
The routine performs automatically a resload_FlushCache before
returning.
SEE ALSO
resload_Decrunch, resload_LoadFile, resload_LoadFileOffset,
resload_SaveFile, resload_SaveFileOffset
WHDLoad/resload_LoadFileOffset
NAME
resload_LoadFileOffset -- load data from inside a file to memory
SYNOPSIS
success,error = resload_LoadFileOffset(size, offset, name, address)
D0 D1 D0 D1 A0 A1
BOOL ULONG ULONG ULONG CPTR APTR
FUNCTION
Loads a part of a file into memory. The part of the file is specified
by an offset in the file and a byte count to read. The routine is
nearly identical to resload_DiskLoad but instead of specifying the
number of the disk to read from a filename is used to select the file.
INPUTS
size - amount of bytes to read
offset - offset in the file
name - name of file
address - memory address to load the file on
EXAMPLE
...
move.l #512,d0 ;size
move.l #$4000,d1 ;offset
lea (_save,pc),a0 ;name
lea $5ac20,a1 ;source
move.l (_resload,pc),a2
jsr (resload_LoadFileOffset,a2)
...
_save dc.b "saved",0
RESULT
success - TRUE on success
errorcode - 0 on success
otherwise a DOS error code from dos.IoErr()
if WHDLF_NoError is set, the function only returns on success
BUGS
NOTE
The routine performs automatically a resload_FlushCache before
returning.
requires ws_Version >= 6
SEE ALSO
resload_DiskLoad, resload_LoadFile
WHDLoad/resload_LoadKick
NAME
resload_LoadKick -- load Kickstart image
SYNOPSIS
resload_LoadKick(size, crc16, name)
D0 D1 A0
ULONG UWORD CPTR
FUNCTION
Loads the Kickstart image with the specified name into ExpMem.
INPUTS
size - size of Kickstart image
crc16 - CRC16 of Kickstart image
name - base name of Kickstart image
EXAMPLE
...
move.l #$40000,d0 ;size
move.w #$f20b,d1 ;crc16
lea (_kick,pc),a0 ;name
move.l (_resload,pc),a2
jsr (resload_LoadKick,a2)
...
_kick dc.b "34005.a500",0
RESULT
BUGS
NOTE
requires ws_Version >= 11
This function is depreciated since WHDLoad v16 because loading a
Kickstart this way will cause a switch to the operation system.
Starting with WHDLoad v16 the Kickstart image to load can be
specified in the Slave structure and when used WHDLoad will load it
before the Slave will called.
SEE ALSO
WHDLoad/resload_Patch
NAME
resload_Patch -- apply patch list
SYNOPSIS
resload_Patch(patchlist, destination)
A0 A1
APTR APTR
FUNCTION
Modify memory using commands from a specified patch list.
To make an installed program work under WHDLoad it must be patched.
That means the program must be modified so that it will load data via
WHDLoad instead of using its own loader routines. Often also various
other things must be changed to make it working.
The modifying of the installed program can be done using this routine.
A patch list will be build using macros from the include file
'whdload.i'. Each entry in the patch list contains a command to
perform, an address to apply the command on and optional extra data.
resload_Patch is especially useful if the memory to modify is located
in ExpMem and therefore the destination address in only known at
runtime and not at creation time of the Slave.
INPUTS
patchlist - list of commands describing the patches to apply
destination - address of memory region to patch
EXAMPLE
...
lea (_pl,pc),a0 ;patch list
move.l (_expmem,pc),a1 ;destination
move.l (_resload,pc),a2
jsr (resload_Patch,a2)
...
_pl PL_START
PL_P $560,_loadfile ;the loading routine
PL_R $2046 ;copylock
PL_END
RESULT
BUGS
NOTE
The routine performs automatically a resload_FlushCache before
returning.
requires ws_Version >= 10
SEE ALSO
resload_PatchSeg
WHDLoad/resload_PatchSeg
NAME
resload_PatchSeg -- apply patch list to a segment list
SYNOPSIS
resload_PatchSeg(patchlist, seglist)
A0 A1
APTR BPTR
FUNCTION
This function is similar to resload_Patch. But instead of patching
memory at a specific address a segment list is used. A segment list is
list of linked list memory regions and returned by dos.LoadSeg or
resload_Relocate.
INPUTS
patchlist - list of commands describing the patches to apply
seglist - list of segments as returned by dos.LoadSeg or
resload_Relocate (that is a BCPL pointer!)
EXAMPLE
...
lea (_name,pc),a0
move.l a0,d1 ;filename
move.l (_dosbase,pc),a6
jsr (_LVOLoadSeg,a6)
lea (_pl,pc),a0 ;patch list
move.l d1,a1 ;segment list
move.l (_resload,pc),a2
jsr (resload_PatchSeg,a2)
...
_pl PL_START
PL_P $560,_loadfile ;the loading routine
PL_R $2046 ;copylock
PL_END
_name dc.b "program",0
RESULT
BUGS
NOTE
The routine performs automatically a resload_FlushCache before
returning.
requires ws_Version >= 15
SEE ALSO
resload_Patch
WHDLoad/resload_ProtectRead
NAME
resload_ProtectRead -- mark memory as read protected
SYNOPSIS
resload_ProtectRead(length, address)
D0 A0
ULONG APTR
FUNCTION
Protects the specified memory against reading by the processor.
The memory to protect must be located inside BaseMem or ExpMem.
INPUTS
length - size of the memory area to protect
address - start address of the memory area to protect
EXAMPLE
...
moveq #4,d0 ;one longword
lea $4070,a0 ;address
move.l (_resload,pc),a2
jsr (resload_ProtectRead,a2)
...
RESULT
a "Exception 'Access Fault'" WHDLoad requester if the protected memory
is read
BUGS
The amount of protected areas is currently limited to 16.
The page where the SSP points to must not be protected. Because if a
Access Fault occurs the CPU will be unable in that case to write the
exception stack frame. Only reset will recover from the resulting
Double Bus Fault.
limitations on MC68020+MC68851:
This hardware is currently not supported.
limitations on MC68030:
- 3-byte transfers are not supported (occurring on misaligned
longword accesses to page boundaries e.g. "tst.l $fff" (assumed
4KByte page size))
- locked accesses (tas/cas/cas2) are not supported
limitations on MC68040:
This hardware is currently not supported.
limitations on MC68060:
- misaligned access are not supported (occurring on accesses through
a page boundary, for example "tst.l ($ffe)" (assumed 4 KByte page
size))
- locked accesses (tas/cas) are not supported
- instructions which are located on a protected page and access the
supervisor portion of the status register will be executed wrong
(these instructions will always see the trace bit as 1 and the
interrupt level as 7, any modification of the status register
supervisor portion will be without effect)
- movem instruction may access a protected area without creating a
Access Fault exception (only the first bus cycle of the execution
unit will be verified to match the protected area)
- move16 and double precision operations (FPU) are unsupported
- a "move (mem),(mem)" with overlapping source and destination
address which generates an Access Fault because Misalignment
will be executed wrong, for example "move.l ($ffc),($ffe)" where
page $1000..$1fff is protected and memory before execution
contains ($ffc)=$11112222,($1000)=$33334444, after execution
$1000 contains $11114444 and not $22224444)
Unsupported accesses will result in a "Exception 'Access Fault'"
WHDLoad requester.
NOTE
requires ws_Version >= 6
The MMU must be in use by WHDLoad, otherwise you will get WHDLoad
requester "Unacceptable Arguments".
Only accesses to the user and supervisor data stream are affected
(this means not affected are: CPU space accesses (e.g. getting values
from the vector table) and instruction stream accesses).
SEE ALSO
resload_ProtectReadWrite, resload_ProtectWrite, resload_ProtectRemove
WHDLoad/resload_ProtectReadWrite
NAME
resload_ProtectReadWrite -- mark memory as read and write protected
SYNOPSIS
resload_ProtectReadWrite(length, address)
D0 A0
ULONG APTR
FUNCTION
Protects the specified memory against reading and writing by the
processor.
The memory to protect must be located inside BaseMem or ExpMem.
INPUTS
length - size of the memory area to protect
address - start address of the memory area to protect
EXAMPLE
...
moveq #4,d0 ;one longword
lea $64,a0 ;address
move.l (_resload,pc),a2
jsr (resload_ProtectReadWrite,a2)
...
RESULT
A "Exception 'Access Fault'" WHDLoad requester if the protected memory
is accessed.
BUGS
The amount of protected areas is currently limited to 16.
The page where the SSP points to must not be protected. Because if a
Access Fault occurs the CPU will be unable in that case to write the
exception stack frame. Only reset will recover from the resulting
Double Bus Fault.
limitations on MC68020+MC68851:
This hardware is currently not supported.
limitations on MC68030:
- 3-byte transfers are not supported (occurring on misaligned
longword accesses to page boundaries e.g. "tst.l $fff" (assumed
4 KByte page size))
- locked accesses (tas/cas/cas2) are not supported
limitations on MC68040:
This hardware is currently not supported.
limitations on MC68060:
- misaligned access are not supported (occurring on accesses trough
a page boundary, for example "tst.l ($ffe)" (assumed 4 KByte page
size))
- locked accesses (tas/cas) are not supported
- instructions which are located on a protected page and access the
supervisor portion of the status register will be executed wrong
(these instructions will always see the trace bit as 1 and the
interrupt level as 7, any modification of the status register
supervisor portion will be without effect)
- movem instruction may access a protected area without creating a
Access Fault exception (only the first bus cycle of the execution
unit will be verified to match the protected area)
- move16 and double precision operations (FPU) are unsupported
- a "move (mem),(mem)" with overlapping source and destination
address which generates an Access Fault because Misalignment
will be executed wrong, for example "move.l ($ffc),($ffe)" where
page $1000..$1fff is protected and memory before execution
contains ($ffc)=$11112222,($1000)=$33334444, after execution
$1000 contains $11114444 and not $22224444)
Unsupported accesses will result in a "Exception 'Access Fault'"
WHDLoad requester.
NOTE
requires ws_Version >= 6
The MMU must be in use by WHDLoad, otherwise you will get WHDLoad
requester "Unacceptable Arguments".
Only accesses to the user and supervisor data stream are affected
(this means not affected are: CPU space accesses (e.g. getting values
from the vector table) and instruction stream accesses).
SEE ALSO
resload_ProtectRead, resload_ProtectWrite, resload_ProtectRemove
WHDLoad/resload_ProtectRemove
NAME
resload_ProtectRemove -- remove protection from memory area
SYNOPSIS
resload_ProtectRemove(length, address)
D0 A0
ULONG APTR
FUNCTION
Remove a previously set protection.
The specified area must exactly match the previously protected area.
INPUTS
length - size of the memory area to protect
address - start address of the memory area to protect
EXAMPLE
...
moveq #4,d0 ;one longword
lea $64,a0 ;address
move.l (_resload,pc),a2
jsr (resload_ProtectRemove,a2)
...
RESULT
BUGS
NOTE
requires ws_Version >= 6
SEE ALSO
resload_ProtectRead, resload_ProtectWrite, resload_ProtectWrite
WHDLoad/resload_ProtectSMC
NAME
resload_ProtectSMC -- detect self modifying code
SYNOPSIS
resload_ProtectSMC(length, address)
D0 A0
ULONG APTR
FUNCTION
Enables automatic detection of self modifying code (SMC) in the
selected area. The selected area will be write protected using the
resload_ProtectWrite mechanism. Additional the trace mode will be
activated and a special handler for trace exceptions installed.
Each write access to the selected area will be logged to a private
memory location. On each instruction executed inside the selected
memory the trace handler verifies, if the instruction has been
previously modified. If an executed instruction has been altered
the installed program will be terminated and WHDLoad will show an
requester informing about the SMC-detection.
To determinate the size of instructions a table is used. This table
contains the opcode size in words depending on the first instruction
word. If the trace exception handler encounters a instruction with
unknown size WHDLoad aborts with an "Internal Error #3". The reason
for this maybe an illegal instruction, an instruction available only
in higher processors than 68000 or an incompleteness of the internal
instruction size table (IST). To check the reason make an coredump
and see which instruction has caused the problem (the instruction
before the actual PC because trace exception occurs after the
execution of the traced instruction). Depending on the reason you have
to aid this:
- If it is an illegal instruction you have to fix the installed
program by patching his code.
- If there is an 68020+ instruction we have a problem, because the
IST is designed only for 68000 instructions where the size of the
instruction can be estimated by the first word and the largest
possible instruction is 5 words. If the instruction size can be
estimated by the first word you may add the instruction to a own
IST (see below).
- If there is an valid 68000 instruction please inform the WHDLoad
author that he adds this instruction to the default IST inside
WHDLoad. For the moment you may add this instruction to an own
IST (see below)
Using an own IST: During the initialization of this function
WHDLoad searches first for an external IST. This must be located in
the same directory where the WHDLoad executable resides and is
searched as "PROGDIR:WHDLoad.IST". If there is no external IST the
internal one is used. The source of the internal IST is included in
source representation in the developer archive and can be used to
build a external IST.
Due the large exception overhead the execution speed in the selected
area will strongly slow down. To improve performance it is therefore
recommend to relocate the SSP to a Fast-Memory location using
ws_ExpMem and appropriate initialistion and modification of the
installed program.
To maximize performance during the initialization of this function
the BaseMem area will be set to NC, the ExpMem and Slave to CB and
all caches will be enabled (resload_SetCPU).
INPUTS
length - size of the memory area to protect
address - start address of the memory area to protect
The area to protect must be located inside the BaseMem or ExpMem.
EXAMPLE
enable SMC-detection for the area $10000..$3e000:
...
move.l #$2e000,d0 ;length
lea $10000,a0 ;address
move.l (_resload,pc),a2
jsr (resload_ProtectSMC,a2)
...
RESULT
BUGS
Currently supported is only 68030 and 68060. For limitations and
restrictions regarding the MMU related part of operation see the BUGS
section of resload_ProtectWrite.
You must not protect the page where the SSP points to, if you do so
an Double Bus Fault will occur because the CPU will be unable to
write the exception stack frame. Only reset will recover from a Double
Bus Fault.
NOTE
requires ws_Version >= 10
The MMU must be in use by WHDLoad, otherwise you will get WHDLoad
requester "Unacceptable Arguments".
There must be no resload_Protect* active at the same time.
SEE ALSO
resload_ProtectWrite, resload_SetCPU
WHDLoad/resload_ProtectWrite
NAME
resload_ProtectWrite -- mark memory as write protected
SYNOPSIS
resload_ProtectWrite(length, address)
D0 A0
ULONG APTR
FUNCTION
Protects the selected area against writing by the processor.
The area to protect must be located inside BaseMem or ExpMem.
INPUTS
length - size of the memory area to protect
address - start address of the memory area to protect
EXAMPLE
...
moveq #4,d0 ;one longword
lea $64,a0 ;address
move.l (_resload,pc),a2
jsr (resload_ProtectWrite,a2)
...
RESULT
BUGS
The amount of protected areas is currently limited to 16.
The page where the SSP points to must not be protected. Because if a
Access Fault occurs the CPU will be unable in that case to write the
exception stack frame. Only reset will recover from the resulting
Double Bus Fault.
limitations on MC68020+MC68851:
This hardware is currently not supported.
limitations on MC68030:
- 3-byte transfers are not supported (occurring on misaligned
longword accesses to page boundaries e.g. "tst.l $fff" (assumed
4 KByte page size))
- locked accesses (tas/cas/cas2) are not supported
limitations on MC68040:
This hardware is currently not supported.
limitations on MC68060:
- misaligned access are not supported (occurring on accesses trough
a page boundary, for example "tst.l ($ffe)" (assumed 4 KByte page
size))
- locked accesses (tas/cas) are not supported
- instructions which are located on a protected page and access the
supervisor portion of the status register will be executed wrong
(these instructions will always see the trace bit as 1 and the
interrupt level as 7, any modification of the status register
supervisor portion will be without effect)
- movem instruction may access a protected area without creating a
Access Fault exception (only the first bus cycle of the execution
unit will be verified to match the protected area)
- move16 and double precision operations (FPU) are unsupported
- a "move (mem),(mem)" with overlapping source and destination
address which generates an Access Fault because Misalignment
will be executed wrong, for example "move.l ($ffc),($ffe)" where
page $1000..$1fff is protected and memory before execution
contains ($ffc)=$11112222,($1000)=$33334444, after execution
$1000 contains $11114444 and not $22224444)
Unsupported accesses will result in a "Exception 'Access Fault'"
WHDLoad requester.
NOTE
requires ws_Version >= 6
The MMU must be in use by WHDLoad, otherwise you will get WHDLoad
requester "Unacceptable Arguments".
Only accesses to the user and supervisor data stream are affected
(this means not affected are: CPU space accesses (e.g. getting values
from the vector table) and instruction stream accesses).
SEE ALSO
resload_ProtectRead, resload_ProtectReadWrite, resload_ProtectRemove
WHDLoad/resload_Relocate
NAME
resload_Relocate -- relocate an AmigaDOS executable
SYNOPSIS
size = resload_Relocate(address, tags)
D0 A0 A1
ULONG APTR STRUCT
FUNCTION
Relocates a standard AmigaDOS executable in memory.
INPUTS
address - the start address of the executable in memory, this is the
source and also the destination address, i.e.
resload_Relocate will relocates the executable over itself
(a multi pass technique is used)
tags - there are two valid tags starting WHDLoad version 14.1
WHDLTAG_CHIPPTR - specifies a extra memory location where
to put hunks with the memory flag MEMF_CHIP
WHDLTAG_FASTPTR - specifies a extra memory location where
to put hunks with the memory flag MEMF_FAST
the different memory locations must not overlap, WHDLoad
will check that and report 'illegal args' if they do
starting WHDLoad version 15.1 there is another tag:
WHDLTAG_ALIGN - it specifies an alignment for the hunks,
the number given must be an positive integer which is
a power of 2, all hunk lengths will be rounded up to
a multiple of this value, useful is 8 to be compatible
with exec.AllocMem which is used by dos.LoadSeg
starting WHDLoad version 16.3 there is another tag:
WHDLTAG_LOADSEG - if specified the function creates a
segment list as if loaded via dos.LoadSeg,
resload_PatchSeg can be used to modify the relocated
executable
EXAMPLE
...
lea (_main,pc),a0 ;name
lea $400,a3 ;A3 = address for program
move.l a3,a1 ;destination
move.l (_resload,pc),a2
jsr (resload_LoadFileDecrunch,a2)
move.l a3,a0 ;address
sub.l a1,a1 ;tags
jsr (resload_Relocate,a2)
...
jmp (a3) ;start the program
...
_main dc.b "main-program",0
EXAMPLE
...
move.l (_freefast),a0 ;address
clr.l -(a7) ;TAG_DONE
move.l (_freechip),-(a7) ;chip area
pea WHDLTAG_CHIPPTR
pea 8 ;8 byte alignment
pea WHDLTAG_ALIGN
move.l a7,a1 ;tags
move.l (_resload,pc),a2
jsr (resload_Relocate,a2)
add.l d0,(_freefast)
add.l (12,a7),(_freechip)
add.w #20,a7
...
EXAMPLE
...
move.l (_freemem),a0 ;address
clr.l -(a7) ;TAG_DONE
pea -1 ;true
pea WHDLTAG_LOADSEG
pea 8 ;8 byte alignment
pea WHDLTAG_ALIGN
move.l a7,a1 ;tags
move.l (_resload,pc),a2
jsr (resload_Relocate,a2)
add.w #5*4,a7
lea (_patchlist),a0
move.l (_freemem),d0
addq.l #4,d0 ;segment starts at offset 4
lsr.l #2,d0 ;make BPTR
move.l d0,a1
jsr (resload_PatchSeg,a2)
...
RESULT
size - size of the relocated executable
(this may be more or less than the size of the executable file,
depending on if BSS hunks are contained in the executable)
tags - the ti_Data field will be overwritten with the length of data
stored in this area
BUGS
The routine supports all hunks supported by Kickstart 1.3 except
OVERLAY. Anyway it is only tested with a limited amount of
executables, so please report any problems or bugs.
NOTE
requires ws_Version >= 8
The function uses stack for variables. The amount depends on the
number of hunks in the executable and can be calculated as
"used stack = hunks * 20 + 32".
Upto WHDLoad version 16.9 the executable must not contain more than 256
hunks (also AmigaDOS allows not more than 256 hunks). Starting WHDLoad
version 17.0 512 hunks are supported. Beware of the stack space, for
512 hunks more 10 KiB stack are required.
The routine performs automatically a resload_FlushCache before
returning.
SEE ALSO
WHDLoad/resload_SaveFile
NAME
resload_SaveFile -- write memory to a file
SYNOPSIS
success,errorcode = resload_SaveFile(size, name, address)
D0 D1 D0 A0 A1
BOOL ULONG ULONG CPTR APTR
FUNCTION
Writes specified memory area to a file using the specified file name.
If multiple data directories are used the file will be created
always in the first data directory. Possible missing sub directories
are only created by WHDLoad if the option SavePath/S is in use.
INPUTS
size - amount of bytes to write
name - name of file to write
address - memory address of buffer to write
EXAMPLE
...
move.l #512,d0 ;size
lea (_save,pc),a0 ;name
lea $5ac20,a1 ;source
move.l (_resload,pc),a2
jsr (resload_SaveFile,a2)
...
_save dc.b "saved",0
RESULT
success - TRUE on success
errorcode - 0 on success
otherwise a DOS error code from dos.IoErr()
If WHDLF_NoError is set, the function only returns on success.
BUGS
NOTE
SEE ALSO
resload_SaveFileOffset
WHDLoad/resload_SaveFileOffset
NAME
resload_SaveFileOffset -- write memory to a file at given offset
SYNOPSIS
success,error = resload_SaveFileOffset(size, offset, name, address)
D0 D1 D0 D1 A0 A1
BOOL ULONG ULONG ULONG CPTR APTR
FUNCTION
Writes specified memory area to a file at specified offset using the
specified file name.
If multiple data directories are used the file will be written always
in the first data directory. If the file is not preloaded and cannot
be preloaded during this function call or the option NoWriteCache/S
is used and the file doesn't exist in the first data directory but in
any other data directory the call to this function will fail with DOS
error code ERROR_OBJECT_EXISTS.
Possible missing sub directories are only created by WHDLoad if the
option SavePath/S is in use.
INPUTS
size - amount of bytes to write
offset - offset in the file to write
name - name of file to write
address - memory address of buffer to write
EXAMPLE
...
move.l #512,d0 ;size
move.l #$4000,d1 ;offset
lea (_save,pc),a0 ;name
lea $5ac20,a1 ;source
move.l (_resload,pc),a2
jsr (resload_SaveFileOffset,a2)
...
_save dc.b "saved",0
RESULT
success - TRUE on success
errorcode - 0 on success
otherwise a DOS error code from dos.IoErr()
If WHDLF_NoError is set, the function only returns on success.
BUGS
NOTE
requires ws_Version >= 5
SEE ALSO
resload_SaveFile
WHDLoad/resload_SetCACR
NAME
resload_SetCACR -- set cacheability for BaseMem
SYNOPSIS
old = resload_SetCACR(new, mask)
D0 D0 D1
ULONG ULONG ULONG
FUNCTION
This function enables/disables the cpu caches.
The changes will affect the CACR (Cache Control Register) and
the MMU-tables if the MMU is used by WHDLoad.
INPUTS
new - new cache status
mask - status bits to change
valid values for new and mask are:
CACRF_EnableI - instruction cache
CACRF_EnableD - data cache
(bits are defined in the standard include file "exec/execbase.i")
EXAMPLE
to enable instruction cache:
...
move.l #CACRF_EnableI,d0 ;new status
move.l d0,d1 ;status to change
move.l (_resload,pc),a2
jsr (resload_SetCACR,a2)
...
RESULT
old - old cache status
BUGS
NOTE
It is safe to call this routine from User or Supervisor mode and
independent from the actual CPU type (also on 68000/010).
If WHDLoad is launched with the option NoCache/S this routine will
return without changing anything (all memory is always noncacheable).
Don't be surprised if you see in the coredump or in a freezer that
caches are enabled even if not enabled by the Slave. Because if the
MMU is used by WHDLoad and no caches are switched on by the Slave,
WHDLoad marks the BaseMem using the MMU as noncacheable-serialized
and enables both caches so that the memory of WHDLoad and the Slave
are still cacheable to increase the performance.
The caches are flushed after returning from this routine.
SEE ALSO
resload_SetCPU, resload_FlushCache
WHDLoad/resload_SetCPU
NAME
resload_SetCPU -- control CPU setup
SYNOPSIS
old = resload_SetCPU(new, mask)
D0 D0 D1
ULONG ULONG ULONG
FUNCTION
This function changes the cacheability of memory areas and changes the
CPU setup.
The changes will affect the CACR (Cache Control Register) on 68020-60,
the PCR (Processor Configuration Register) on 68060 and the MMU-tables
if the MMU is used by WHDLoad.
Check the WHDLoad manual section "CPU Cache Handling" for further
informations. See the include file "whdload.i" for supported bit sets.
INPUTS
new - new setup
mask - parts of the current setup to change
EXAMPLE
to enable the only instruction cache for BaseMem and ExpMem:
...
move.l #WCPUF_Base_WT|WCPUF_Exp_CB|WCPUF_IC,d0
move.l #WCPUF_Base|WCPUF_Exp|WCPUF_IC|WCPUF_DC,d1
move.l (_resload,pc),a2
jsr (resload_SetCPU,a2)
...
RESULT
old - the setup before
BUGS
NOTE
requires ws_Version >= 10
It is safe to call this routine from User or Supervisor mode and
independent from the actual CPU type (also on 68000/010).
If WHDLoad is launched with the option NoCache/S this routine will
return without changing anything (all memory is always noncacheable).
Don't be surprised if you see in the coredump or in a freezer that
caches are enabled even if not enabled by the Slave. Because if the
MMU is used by WHDLoad and caches are disabled by the Slave,
WHDLoad marks the memory using the MMU as noncacheable-serialized
and enables both caches so that the memory of WHDLoad is still
cacheable to increase the performance.
The caches are flushed after returning from this routine.
SEE ALSO
WHDLoad.Slave/--Overview--
The WHDLoad.Slave contains the interface code which makes the installed
program able to load his files from harddisk. Additional it should realize
the possibility to quit the program to return to the OS.
FORMAT
Is a standard AmigaDOS executable.
ATTENTION
The Slave MUST consist of only ONE hunk (ONE section).
The Slave MUST be 100% PC-relative (must not contain relocations).
It may contain debug/symbol hunks which are ignored.
STRUCTURE
At the top of the Slave is the "WHDLoadSlave" structure. After this
follows the specific code and data.
STRUCTURE WHDLoadSlave,0
STRUCT ws_Security,4
STRUCT ws_ID,8
UWORD ws_Version
UWORD ws_Flags
ULONG ws_BaseMemSize
ULONG ws_ExecInstall
RPTR ws_GameLoader
RPTR ws_CurrentDir
RPTR ws_DontCache
( LABEL ws_SIZEOF_pre_v4 )
UBYTE ws_keydebug
UBYTE ws_keyexit
( LABEL ws_SIZEOF_pre_v8 )
ULONG ws_ExpMem
( LABEL ws_SIZEOF_pre_v10 )
RPTR ws_name
RPTR ws_copy
RPTR ws_info
( LABEL ws_SIZEOF_pre_v16 )
RPTR ws_kickname
ULONG ws_kicksize
UWORD ws_kickcrc
( LABEL ws_SIZEOF_pre_v17 )
RPTR ws_config
LABEL ws_SIZEOF
ws_Security
Contains the code
moveq #-1,d0
rts
to avoid problems if somebody tries execute the Slave directly.
ws_ID
Contains the string "WHDLOADS" to identify the program as a
WHDLoad Slave.
(use the macro SLAVE_HEADER defined in the include file "whdload.i" to
create the entries ws_Security and ws_ID)
ws_Version
Contains the version of WHDLoad that is required by the Slave.
Some resload functions need at least a specific version of
WHDLoad. E.g. to use resload_CRC16 you must set ws_Version
to 3 or higher.
On the other side the size of the WHDLoad Slave structure
differs for different Slave versions. I.e. if you set
ws_Version to 16 or higher you MUST also initialize the fields
up to ws_kickcrc (even if you don't use a Kickstart image).
ws_Flags
WHDLF_Disk / WHDLB_Disk
This flag should be enabled if the program uses disk images.
As a result Preload/S is working slightly different.
(starting WHDLoad 0.143 this flag is obsolete)
WHDLF_NoError / WHDLB_NoError
If enabled every error occurring in a resload_#? function
forces WHDLoad to quit immediately and showing an error
requester about the reason.
Using this flag makes it unnecessary for the Slave to check
the return codes of resload_#? functions. The Slave can then
be sure that if a function returns it was successful (this
will make the Slave more simple).
WHDLF_EmulTrap / WHDLB_EmulTrap
This flag has only effect if the VBR is moved by WHDLoad
(i.e. the machine is at least a 68010 and the tooltype
NoVBRMove is not set).
If the flag is set all "Trap #0..15"'s are emulated by the
exception handler inside WHDLoad. I.e. the handler checks
if the appropriate trap vector ($80-$bc) is initialized,
and if the routine at the vector address will be called by
WHDLoad.
WHDLF_NoDivZero / WHDLB_NoDivZero
This flag has only effect if the VBR is moved by WHDLoad
(i.e. the machine is at least a 68010 and the tooltype
NoVBRMove is not set).
If the flag is set and a "Division by Zero" exception
occurs WHDLoad will not quit with an requester, but a
RTE will be performed.
This maybe useful if the demo/game performs randomly
divisions by zero.
WHDLF_Req68020 / WHDLB_Req68020
This flag indicates that the Slave/installed program
requires at least a MC68020 CPU. WHDLoad will check at
startup if this requirement is fulfilled. If it doesn't the
program will be terminated with an appropriate requester.
WHDLF_ReqAGA / WHDLB_ReqAGA
This flag indicates that the Slave/installed program
requires at least the AGA chipset. WHDLoad will check at
startup if this requirement is fulfilled. If it doesn't the
program will be terminated with an appropriate requester.
WHDLF_NoKbd / WHDLB_NoKbd
This flag tells WHDLoad that it doesn't should acknowledge
the keyboard if a key was pressed. This must be used with
programs which doesn't check the keyboard from the PORTS
interrupt ($68). Background information: In normal
operation when NoVBRMove is inactive, WHDLoad checks if a
key was pressed on each interrupt. If a key has been
pressed it checks the rawkey code against QuitKey, DebugKey
and FreezeKey. If it doesn't match any of them it checks if
there is an initialized PORTS interrupt ($68). If there is
no one it replies the keyboard that the keycode has been
received. Therefore when the installed program later checks
the keyboard from e.g. the VBI, it will never receive any
keycodes. This flag avoids this behavior.
WHDLF_EmulLineA / WHDLB_EmulLineA
This flag has only effect if the VBR is moved by WHDLoad
(i.e. the machine is at least a 68010 and the tooltype
NoVBRMove is not set).
If the flag is set all exceptions "Line-A" (caused by
opcodes starting with %1010) are emulated by the
exception handler inside WHDLoad. I.e. the handler checks
if the vector ($28) is initialized and if the routine to
which the vector points will be called by WHDLoad.
WHDLF_EmulTrapV / WHDLB_EmulTrapV
This flag has only effect if the VBR is moved by WHDLoad
(i.e. the machine is at least a 68010 and the tooltype
NoVBRMove is not set).
If the flag is set all exceptions caused by a "TrapV"
instruction are emulated by the exception handler inside
WHDLoad. I.e. the handler checks if the vector ($1C) is
initialized and if the routine to which the vector points
will be called by WHDLoad.
WHDLF_EmulChk / WHDLB_EmulChk
This flag has only effect if the VBR is moved by WHDLoad
(i.e. the machine is at least a 68010 and the tooltype
NoVBRMove is not set).
If the flag is set all exceptions caused by a "Chk/Chk2"
instruction are emulated by the exception handler inside
WHDLoad. I.e. the handler checks if the vector ($18) is
initialized and if the routine to which the vector points
will be called by WHDLoad.
WHDLF_EmulPriv / WHDLB_EmulPriv
This flag has only effect if the VBR is moved by WHDLoad
(i.e. the machine is at least a 68010 and the tooltype
NoVBRMove is not set).
If the flag is set all privilege violation exceptions are
emulated by the exception handler inside WHDLoad. I.e. the
handler checks if the vector ($20) is initialized and if
the routine to which the vector points will be called by
WHDLoad.
WHDLF_EmulLineF / WHDLB_EmulLineF
This flag has only effect if the VBR is moved by WHDLoad
(i.e. the machine is at least a 68010 and the tooltype
NoVBRMove is not set).
If the flag is set all exceptions "Line-F" (caused by
opcodes starting with %1010) are emulated by the
exception handler inside WHDLoad. I.e. the handler checks
if the vector ($2C) is initialized and if the routine to
which the vector points will be called by WHDLoad.
WHDLF_ClearMem / WHDLB_ClearMem
If that flag is set WHDLoad will not init BaseMem with the
pattern $CCCCCCCC and ExpMem with $DDDDDDDD but simply
clear these memories.
WHDLF_Examine / WHDLB_Examine
This flag must be set if the functions
resload_Examine/ExNext will be used. It causes WHDLoad to
cache informations about all files and directories. This
consumes memory and takes time at startup. Therefore it
shouldn't be used without necessity.
WHDLF_EmulDivZero / WHDLB_EmulDivZero
This flag has only effect if the VBR is moved by WHDLoad
(i.e. the machine is at least a 68010 and the tooltype
NoVBRMove is not set).
If the flag is set all division by zero exceptions are
emulated by the exception handler inside WHDLoad. I.e. the
handler checks if the vector ($14) is initialized and if
the routine to which the vector points to will be called by
WHDLoad.
This flag has precedence over the flag NoDivZero.
WHDLF_EmulIllegal / WHDLB_EmulIllegal
This flag has only effect if the VBR is moved by WHDLoad
(i.e. the machine is at least a 68010 and the tooltype
NoVBRMove is not set).
If the flag is set all illegal instruction exceptions are
emulated by the exception handler inside WHDLoad. I.e. the
handler checks if the vector ($10) is initialized and if
the routine to which the vector points will be called by
WHDLoad.
ws_BaseMemSize
The size of the memory that is required by the program.
The BaseMemory starts at $00000000 and ends at ws_BaseMemSize.
BaseMemory is always ChipMem.
This value must be multiple of $1000.
The valid minimum is $2000 and the maximum is $200000.
ws_ExecInstall
obsolete, must be set to 0
ws_GameLoader
A relative (to the start of the structure) 16-bit pointer
to the start code of the Slave.
ws_CurrentDir
A relative (to the start of the structure) 16-bit pointer
to a 0 terminated string which is the name of the path
where all files are stored (sub directory).
If no sub directory is used initialize this with 0.
The path to the sub directory must be relative (must not
contain ":").
ws_DontCache
A relative (to the start of the structure) 16-bit pointer
to a 0 terminated string which is a standard AmigaDOS
pattern (dos.ParsePattern, dos.MatchPattern).
All files matching this pattern are not cached by WHDLoad.
If you don't want to use it set the entry to 0.
Starting WHDLoad version 0.107 this is obsolete, because saved
files will be written also to the file cache.
The following variables are only evaluated by WHDLoad if ws_Version
is set to >= 4. The following variables MUST be initialized if you set
ws_Version to >= 4.
ws_keydebug
The raw key code to exit and writing debug files.
This variable will be overwritten by WHDLoad using the value
specified with the option DebugKey/K/N if set.
If the Slave provides an own handler to support a debug option
via the keyboard it should use this value for comparison. So
it will be possible to the user to change the key suggested
by the Slave.
WHDLoad itself also checks for this key code on each interrupt
if the VBR is moved (requires 68010+ and that NoVBRMove/S is
not set).
If the variable is set to 0 WHDLoads default will be used.
Starting WHDLoad version 17.0 the contents of this variable
is ignored. It will be always overwritten by WHDLoad with the
default or the specified DebugKey/K/N.
Recommend value is 0.
ws_keyexit
The raw key code to exit.
This variable will be overwritten by WHDLoad using the value
specified with the option QuitKey/K/N if set.
If the Slave provides an own handler to support a quit option
via the keyboard it should use this value for comparison. So
it will be possible to the user to change the key suggested
by the Slave.
WHDLoad itself also checks for this key code on each interrupt
if the VBR is moved (requires 68010+ and that NoVBRMove/S is
not set).
Recommend value is $59 = "F10".
The following variables are only evaluated by WHDLoad if ws_Version
is set to >= 8. The following variables MUST be initialized if you set
ws_Version to >= 8.
ws_ExpMem
If the installed program requires expansion memory, the size
must be specified here. WHDLoad will allocate a memory block
of this size and writes a pointer to the start of the
allocated memory back to this entry. The memory is granted to
be aligned to $1000 (4096 bytes). The size specified must be
a multiple of $1000 (4096). If WHDLoad fails to allocate
this memory it terminates with an appropriate error requester.
That means the Slave will always get a valid pointer here.
Starting WHDLoad version 10.2 the value can be negative. A
negative size means that the memory is optional and not
required. WHDLoad will try to allocate it and if it fails it
will set ws_ExpMem to zero. Therefore the Slave has to check
the contents of ws_ExpMem.
The following variables are only evaluated by WHDLoad if ws_Version
is set to >= 10. The following variables MUST be initialized if you set
ws_Version to >= 10.
ws_name
A relative (to the start of the structure) 16-bit pointer
to a 0 terminated string containing the name of the installed
program. e.g. "Super Hang Off"
ws_copy
A relative (to the start of the structure) 16-bit pointer
to a 0 terminated string containing the copyright of the
installed program. The string should start with the year
followed by the company holding the copyright. Multiple years
or companies should be separated with ", ".
e.g. "1983 Schega, 1989 Bad Dreams"
ws_info
A relative (to the start of the structure) 16-bit pointer
to a 0 terminated string containing additional infos about the
installed program. The string may also contain line feeds
($0a). The character -1 has a special meaning. It results in
a line feed and an additional vertical skip of the half font
height. e.g.:
dc.b "installed & fixed by Wepl",10
dc.b "version 1.4 (06.06.2066)",-1
dc.b "greetings to the world",0
The following variables are only evaluated by WHDLoad if ws_Version
is set to >= 16. The following variables MUST be initialized if you set
ws_Version to >= 16.
ws_kickname
A relative (to the start of the structure) 16-bit pointer
to a 0 terminated string containing the name of the Kickstart
image to be loaded by WHDLoad to ExpMem. The path
"DEVS:Kickstarts/" will be prepended by WHDLoad to find the
file. e.g. "kick34005.A500"
ws_kicksize
The size of the Kickstart image to load.
ws_kickcrc
The CRC16 checksum for the Kickstart image to load.
Starting WHDLoad 16.1 there is a special mode which supports multiple
Kickstart images within the same Slave. The special mode is activated
by using -1 as the value for ws_kickcrc. ws_kickname contains then a
relative pointer to a table which contains pairs of CRC16 and relative
pointers to a Kickstart name. The table is terminated with a CRC16 of
0. WHDLoad will try to load Kickstarts from the table until it finds
one with the correct CRC16. After the successful load the CRC16 of the
loaded Kickstart image will be placed in ws_kickcrc (overwriting the
-1) so the Slave can recognize which Kickstart image has been loaded.
The following variables are only evaluated by WHDLoad if ws_Version
is set to >= 17. The following variables MUST be initialized if you set
ws_Version to >= 17.
ws_config
A relative (to the start of the structure) 16-bit pointer
to a 0 terminated string containing infos about configuration
items to be displayed in the WHDLoad startup splash window.
Possible items are the options ButtonWait and Custom1-5. For
each item specified here a gadget will be added to the splash
window, allowing the user easily the modify this option.
The syntax in a EBNF is as follows:
Config = ConfigOption { ";" ConfigOption } ;
ConfigOption = Option [ ":" Type ":" Label [ ":" Spec ] ] ;
Option = "BW" | "C1" | "C2" | "C3" | "C4" | "C5" ;
(* BW - ButtonWait, without Type *)
(* C1..C5 - Custom1..5, requires Type *)
Type = "B" | "L" | "0" ;
(* B - Boolean *)
(* X - Boolean only 1 bit used, Spec is the bit number
0-31 *)
(* L - List of values, cycle gadget, Spec is list of
SpecOptions *)
Spec = Number | ( SpecOption { "," SpecOption } ) ;
Number = [0-9] ;
SpecOption = Label ;
Label = CHR(32..255) except [,:;] ;
On Type=Boolean (also ButtonWait) the result will be 0 for
unchecked and 1 for checked. On Type=List the result will be
0 for the first SpecOption and is incremented by 1 for each
subsequent SpecOption.
Example:
dc.b "BW;"
dc.b "C1:B:Skip Intro;"
dc.b "C2:X:Activate Trainer:0;"
dc.b "C3:L:Load Game Position:None,1,2,3,4,5,6,7,8,9;"
dc.b "C4:L:Brightness:default,+50%,+100%"
dc.b 0
CONVENTIONS for ws_GameLoader
Following the status of the system at the moment of calling
ws_GameLoader:
CPU:
SR = $2000 Supervisor-mode, all interrupts enabled
SSP = ws_BaseMemSize at the end of BaseMem
USP = SSP-$400 at the end of BaseMem - 1024
A0 = ResidentLoader pointer to the resident Jump-Tower
D0-D7/A1-A6 random (D0=$d0d0d0d0 D1=...)
Nothing more is interesting from the Slave programmers point
of view. All special registers like VBR,SFC,DFC,CAAR,CACR,MSP,
TC,MMUSR,CRP,SRP,URP,TT0,TT1,DTT0,DTT1,ITT0,ITT1,PCR,BUSCR are
WHDLoad private and MUST NOT BE CHANGED.
FPU:
At the moment not initialized by WHDLoad.
BaseMem:
$00000000.l = 0
$00000004.l = $f0000001
an odd value to make any try to use it (the execbase)
creating an "Address Error" or "Access Fault" exception
$00000008...$00000400
if WHDLoad has moved the VBR it contains $CCCCCCCC
else it contains a pointer to an exception handler
inside WHDLoad
$00000400...ws_BaseMemSize
contains $CCCCCCCC, this memory fill pattern is used to
easily recognize modified memory
$00001000.l = $FFFFFFFE
the copper instruction "CWAIT $ff,$1fe" (CEND)
ExpMem:
the memory is filled with the pattern $DDDDDDDD
custom registers:
dmacon = 0 all DMAs off
intena = 0 all interrupts off
cop1lc = cop2lc = $1000
a AGA-machine is switched to OCS
cias:
------- ciaa ------ ------- ciab ------
pra in = %00000000 pra in = %00000000
pra out = %11111100 pra out = %11111000
ddra = %00000011 ddra = %11000000
prb in = %00000000 prb in = %00000000
prb out = %00000000 prb out = %11111111
ddrb = %00000000 ddrb = %11111111
ta = $21ff ta = $ffff
tb = $21ff tb = $ffff
event = $000000 event = $000000
(alarm = $ffffff alarm = execbase.EClockFrequency
the alarm values are no longer initialized starting
WHDLoad version 13.1 to avoid compatibility problems
on Kickstart 2.0)
sdr = $00 sdr = $00
icr = %00000000 icr = %00000000
icm = %00001000 icm = %00000000
cra = %00000000 cra = %00000000
crb = %00000000 crb = %00000000
SEE ALSO
example Slaves