Subversion Repositories or1k

|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
|M68000 Hi-Performance Microprocessor Division
|M68060 Software Package
|Production Release P1.00 -- October 10, 1994
|
| 
|THE SOFTWARE is provided on an "AS IS" basis and without warranty.
|To the maximum extent permitted by applicable law,
|MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, 
|INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
|and any warranty against infringement with regard to the SOFTWARE
|(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
|
|To the maximum extent permitted by applicable law,
|IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
|(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
|BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
|ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
|Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
|
|You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
|so long as this entire notice is retained without alteration in any modified and/or
|redistributed versions, and that such modified versions are clearly identified as such.
|No licenses are granted by implication, estoppel or otherwise under any patents
|or trademarks of Motorola, Inc.
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| iskeleton.s
|
| This file contains:
|       (1) example "Call-out"s
|       (2) example package entry code
|       (3) example "Call-out" table
|

#include <linux/linkage.h>
#include <asm/entry.h>
#include "../kernel/m68k_defs.h"


|################################
| (1) EXAMPLE CALL-OUTS         #
|                               #
| _060_isp_done()               #
| _060_real_chk()               #
| _060_real_divbyzero()         #
|                               #
| _060_real_cas()               #
| _060_real_cas2()              #
| _060_real_lock_page()         #
| _060_real_unlock_page()       #
|################################

|
| _060_isp_done():
|
| This is and example main exit point for the Unimplemented Integer
| Instruction exception handler. For a normal exit, the 
| _isp_unimp() branches to here so that the operating system
| can do any clean-up desired. The stack frame is the
| Unimplemented Integer Instruction stack frame with
| the PC pointing to the instruction following the instruction
| just emulated.
| To simply continue execution at the next instruction, just
| do an "rte".
|
| Linux/68k: If returning to user space, check for needed reselections.

        .global         _060_isp_done
_060_isp_done:
        btst    #0x5,%sp@               | supervisor bit set in saved SR?
        beq     .Lnotkern
        rte
.Lnotkern:
        SAVE_ALL_INT
        GET_CURRENT(%d0)
        tstl    %curptr@(TASK_NEEDRESCHED)
        jne     SYMBOL_NAME(ret_from_exception) | deliver signals,
                                                | reschedule etc..
        RESTORE_ALL

|
| _060_real_chk():
|
| This is an alternate exit point for the Unimplemented Integer
| Instruction exception handler. If the instruction was a "chk2"
| and the operand was out of bounds, then _isp_unimp() creates
| a CHK exception stack frame from the Unimplemented Integer Instrcution
| stack frame and branches to this routine.
|
| Linux/68k: commented out test for tracing

        .global         _060_real_chk
_060_real_chk:
|       tst.b           (%sp)                   | is tracing enabled?
|       bpls            real_chk_end            | no

|
|           CHK FRAME              TRACE FRAME
|       *****************       *****************
|       *   Current PC  *       *   Current PC  *
|       *****************       *****************
|       * 0x2 *  0x018  *       * 0x2 *  0x024  *
|       *****************       *****************
|       *     Next      *       *     Next      *
|       *      PC       *       *      PC       *
|       *****************       *****************
|       *      SR       *       *      SR       *
|       *****************       *****************
|
|       move.b          #0x24,0x7(%sp)          | set trace vecno
|       bral            _060_real_trace

real_chk_end:
        bral            SYMBOL_NAME(trap)       | jump to trap handler

|
| _060_real_divbyzero:
|
| This is an alternate exit point for the Unimplemented Integer 
| Instruction exception handler isp_unimp(). If the instruction is a 64-bit
| integer divide where the source operand is a zero, then the _isp_unimp() 
| creates a Divide-by-zero exception stack frame from the Unimplemented
| Integer Instruction stack frame and branches to this routine.
|
| Remember that a trace exception may be pending. The code below performs
| no action associated with the "chk" exception. If tracing is enabled,
| then it create a Trace exception stack frame from the "chk" exception
| stack frame and branches to the _real_trace() entry point.
| 
| Linux/68k: commented out test for tracing

        .global         _060_real_divbyzero
_060_real_divbyzero:
|       tst.b           (%sp)                   | is tracing enabled?
|       bpls            real_divbyzero_end      | no

|
|        DIVBYZERO FRAME           TRACE FRAME
|       *****************       *****************
|       *   Current PC  *       *   Current PC  *
|       *****************       *****************
|       * 0x2 *  0x014  *       * 0x2 *  0x024  *
|       *****************       *****************
|       *     Next      *       *     Next      *
|       *      PC       *       *      PC       *
|       *****************       *****************
|       *      SR       *       *      SR       *
|       *****************       *****************
|
|       move.b          #0x24,0x7(%sp)          | set trace vecno
|       bral            _060_real_trace

real_divbyzero_end:
        bral            SYMBOL_NAME(trap)       | jump to trap handler

|##########################

|
| _060_real_cas():
|
| Entry point for the selected cas emulation code implementation.
| If the implementation provided by the 68060ISP is sufficient,
| then this routine simply re-enters the package through _isp_cas.
|
        .global         _060_real_cas
_060_real_cas:
        bral            _I_CALL_TOP+0x80+0x08

|
| _060_real_cas2():
|
| Entry point for the selected cas2 emulation code implementation.
| If the implementation provided by the 68060ISP is sufficient,
| then this routine simply re-enters the package through _isp_cas2.
|
        .global         _060_real_cas2
_060_real_cas2:
        bral            _I_CALL_TOP+0x80+0x10

|
| _060_lock_page():
|
| Entry point for the operating system`s routine to "lock" a page
| from being paged out. This routine is needed by the cas/cas2
| algorithms so that no page faults occur within the "core" code
| region. Note: the routine must lock two pages if the operand 
| spans two pages.
| NOTE: THE ROUTINE SHOULD RETURN AN FSLW VALUE IN D0 ON FAILURE
| SO THAT THE 060SP CAN CREATE A PROPER ACCESS ERROR FRAME.
| Arguments:
|       a0 = operand address
|       d0 = `xxxxxxff -> supervisor; `xxxxxx00 -> user
|       d1 = `xxxxxxff -> longword; `xxxxxx00 -> word
| Expected outputs:
|       d0 = 0 -> success; non-zero -> failure
|
| Linux/68k: As long as ints are disabled, no swapping out should
| occur (hopefully...)
|
        .global         _060_real_lock_page
_060_real_lock_page:
        clr.l           %d0
        rts

|
| _060_unlock_page():
|
| Entry point for the operating system`s routine to "unlock" a
| page that has been "locked" previously with _real_lock_page.
| Note: the routine must unlock two pages if the operand spans
| two pages.
| Arguments:
|       a0 = operand address
|       d0 = `xxxxxxff -> supervisor; `xxxxxx00 -> user
|       d1 = `xxxxxxff -> longword; `xxxxxx00 -> word
|
| Linux/68k: As we do no special locking operation, also no unlocking
| is needed...

        .global         _060_real_unlock_page
_060_real_unlock_page:
        clr.l           %d0
        rts

|###########################################################################

|#################################
| (2) EXAMPLE PACKAGE ENTRY CODE #
|#################################

        .global         _060_isp_unimp
_060_isp_unimp:
        bral            _I_CALL_TOP+0x80+0x00

        .global         _060_isp_cas
_060_isp_cas:
        bral            _I_CALL_TOP+0x80+0x08

        .global         _060_isp_cas2
_060_isp_cas2:
        bral            _I_CALL_TOP+0x80+0x10

        .global         _060_isp_cas_finish
_060_isp_cas_finish:
        bra.l           _I_CALL_TOP+0x80+0x18

        .global         _060_isp_cas2_finish
_060_isp_cas2_finish:
        bral            _I_CALL_TOP+0x80+0x20

        .global         _060_isp_cas_inrange
_060_isp_cas_inrange:
        bral            _I_CALL_TOP+0x80+0x28

        .global         _060_isp_cas_terminate
_060_isp_cas_terminate:
        bral            _I_CALL_TOP+0x80+0x30

        .global         _060_isp_cas_restart
_060_isp_cas_restart:
        bral            _I_CALL_TOP+0x80+0x38

|###########################################################################

|###############################
| (3) EXAMPLE CALL-OUT SECTION #
|###############################

| The size of this section MUST be 128 bytes!!!

_I_CALL_TOP:
        .long   _060_real_chk           - _I_CALL_TOP
        .long   _060_real_divbyzero     - _I_CALL_TOP
        .long   _060_real_trace         - _I_CALL_TOP
        .long   _060_real_access        - _I_CALL_TOP
        .long   _060_isp_done           - _I_CALL_TOP

        .long   _060_real_cas           - _I_CALL_TOP
        .long   _060_real_cas2          - _I_CALL_TOP
        .long   _060_real_lock_page     - _I_CALL_TOP
        .long   _060_real_unlock_page   - _I_CALL_TOP

        .long   0x00000000, 0x00000000, 0x00000000, 0x00000000
        .long   0x00000000, 0x00000000, 0x00000000

        .long   _060_imem_read          - _I_CALL_TOP
        .long   _060_dmem_read          - _I_CALL_TOP
        .long   _060_dmem_write         - _I_CALL_TOP
        .long   _060_imem_read_word     - _I_CALL_TOP
        .long   _060_imem_read_long     - _I_CALL_TOP
        .long   _060_dmem_read_byte     - _I_CALL_TOP
        .long   _060_dmem_read_word     - _I_CALL_TOP
        .long   _060_dmem_read_long     - _I_CALL_TOP
        .long   _060_dmem_write_byte    - _I_CALL_TOP
        .long   _060_dmem_write_word    - _I_CALL_TOP
        .long   _060_dmem_write_long    - _I_CALL_TOP

        .long   0x00000000
        .long   0x00000000, 0x00000000, 0x00000000, 0x00000000

|###########################################################################

| 060 INTEGER KERNEL PACKAGE MUST GO HERE!!!
        .include "isp.sa"