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linux-loongson/arch/m68k/ifpsp060/iskeleton.S
Roman Zippel 3b66a1edb0 [PATCH] m68k: convert thread flags to use bit fields 
Remove task_work structure, use the standard thread flags functions and use
shifts in entry.S to test the thread flags.  Add a few local labels to entry.S
to allow gas to generate short jumps.

Finally it changes a number of inline functions in thread_info.h to macros to
delay the current_thread_info() usage, which requires on m68k a structure
(task_struct) not yet defined at this point.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-13 18:14:14 -08:00

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|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
|M68000 Hi-Performance Microprocessor Division
|M68060 Software Package
|Production Release P1.00 -- October 10, 1994
|
|M68060 Software Package Copyright © 1993, 1994 Motorola Inc. All rights reserved.
|
|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 <asm/asm-offsets.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)
| deliver signals, reschedule etc..
jra ret_from_exception
|
| _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 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 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/m68k: Make sure the page is properly paged in, so we use
| plpaw and handle any exception here. The kernel must not be
| preempted until _060_unlock_page(), so that the page stays mapped.
|
.global _060_real_lock_page
_060_real_lock_page:
move.l %d2,-(%sp)
| load sfc/dfc
tst.b %d0
jne 1f
moveq #1,%d0
jra 2f
1: moveq #5,%d0
2: movec.l %dfc,%d2
movec.l %d0,%dfc
movec.l %d0,%sfc
clr.l %d0
| prefetch address
.chip 68060
move.l %a0,%a1
1: plpaw (%a1)
addq.w #1,%a0
tst.b %d1
jeq 2f
addq.w #2,%a0
2: plpaw (%a0)
3: .chip 68k
| restore sfc/dfc
movec.l %d2,%dfc
movec.l %d2,%sfc
move.l (%sp)+,%d2
rts
.section __ex_table,"a"
.align 4
.long 1b,11f
.long 2b,21f
.previous
.section .fixup,"ax"
.even
11: move.l #0x020003c0,%d0
or.l %d2,%d0
swap %d0
jra 3b
21: move.l #0x02000bc0,%d0
or.l %d2,%d0
swap %d0
jra 3b
.previous
|
| _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/m68k: perhaps reenable preemption here...
.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"
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