REM Copyright (c) 2021, RISC OS Open Ltd
REM All rights reserved.
REM
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REM modification, are permitted provided that the following conditions are met:
REM     * Redistributions of source code must retain the above copyright
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REM     * Redistributions in binary form must reproduce the above copyright
REM       notice, this list of conditions and the following disclaimer in the
REM       documentation and/or other materials provided with the distribution.
REM     * Neither the name of RISC OS Open Ltd nor the names of its contributors
REM       may be used to endorse or promote products derived from this software
REM       without specific prior written permission.
REM
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REM AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
REM IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
REM ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
REM LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
REM CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
REM SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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REM POSSIBILITY OF SUCH DAMAGE.

REM Test prefetch abort support for abortable DAs / AbortTrap

ON ERROR ERROR EXT 0,REPORT$+" at "+STR$(ERL)
da_size%=4096
SYS "OS_Module",6,,,1024 TO ,,rma%

FOR pass=0 TO 2 STEP 2
P%=rma%
[ OPT pass
.da_handler%
CMP R0,#4 ; Normal DA resize op?
MOVLO PC,LR ; Allow it
; R0 = DA handler reason, 5 = aborttrap
; R1 = flags
; R2 = buffer
; R3 = required address
; R4 = length
; R5 = current end of DA (nonsense for sparse DAs)
; R12 = param
STMFD R13!,{R0-R6,R14}
ADR R14,last_call%
MRS R6,CPSR
STMIA R14,{R0-R5,R6,R12}
CMP R0,#5 ; Abort op?
BNE return_bad_reason
AND R1,R1,#15
CMP R1,#2
BNE return_bad_reason ; only support memmap requests
; Satisfy the request by growing the DA
LDR R0,da_num_asm%
MOV R1,#4096
SWI "XOS_ChangeDynamicArea"
STRVS R0,[SP]
LDMVSFD R13!,{R0-R6,PC}
; Copy over some code to execute
ADR R0,da_code%
LDMIA R0,{R2,R3}
LDR R1,da_base_ptr%
STMIA R1,{R2,R3}
ADD R2,R1,#8
MOV R0,#1
SWI "XOS_SynchroniseCodeAreas"
LDMFD R13!,{R0-R6,PC}

.return_bad_reason
LDMFD R13!,{R0-R6,R14}
MSR CPSR_f,#(1<<28)
ADR R0,bad_reason
MOV PC,LR

.bad_reason
EQUD 0
EQUS "Bad reason" : EQUB 0
ALIGN

.da_code%
MOV R0,#123
MOV PC,LR

.read_sctlr%
SWI "OS_EnterOS"
MRC CP15,0,R0,C1,C0,0
SWI "OS_LeaveOS"
MOV PC,R14

.last_call%
.last_R0% EQUD 0
.last_R1% EQUD 0
.last_R2% EQUD 0
.last_R3% EQUD 0
.last_R4% EQUD 0
.last_R5% EQUD 0
.last_PSR% EQUD 0
.last_R12% EQUD 0

.da_base_ptr% EQUD 0
.da_num_asm% EQUD 0
]
NEXT pass

wp%=RND
da_num%=0

ON ERROR PRINT REPORT$;" at ";ERL : PROCend(1)

PRINT "handler: ";~da_handler%
PRINT "wp: ";~wp%
PRINT "last_call: ";~last_call%

REM Create an empty abortable DA
SYS "OS_DynamicArea",0,-1,0,-1,(1<<7)+(1<<16),da_size%,da_handler%,wp%,"ATTest" TO ,da_num%,,da_base%

!da_base_ptr%=da_base%
!da_num_asm%=da_num%

PRINT "da_base: ";~da_base%

REM Try executing code from the unmapped page
A%=-1
val%=USR da_base%
IF val%<>123 THEN PRINT "Failed" : PROCend(1)

PROCend(0)

DEF PROCendtest
 IF da_num%<>0 THEN PROClast : SYS "OS_DynamicArea",1,da_num% : da_num%=0
ENDPROC

DEF PROCend(E%)
 PROCendtest
 SYS "OS_Module",7,,rma%
 IF E% THEN ERROR EXT 0,"Failed"
 PRINT "Success"
 END
ENDPROC

DEF PROClast
 PRINT "last R0 ";~!last_R0%;" R1 ";~!last_R1%;" R2 ";~!last_R2%;" R3 ";~!last_R3%;" R4 ";~!last_R4%;" R5 ";~!last_R5%;" PSR ";~!last_PSR%;" R12 ";~!last_R12%
ENDPROC