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Diffstat (limited to 'newlib/libc/sys/a29khif/crt0.S')
| -rw-r--r-- | newlib/libc/sys/a29khif/crt0.S | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/newlib/libc/sys/a29khif/crt0.S b/newlib/libc/sys/a29khif/crt0.S deleted file mode 100644 index 8ae79f898..000000000 --- a/newlib/libc/sys/a29khif/crt0.S +++ /dev/null @@ -1,226 +0,0 @@ -; @(#)crt0.s 2.7 90/10/15 13:17:57, AMD -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; Copyright 1988, 1989, 1990 Advanced Micro Devices, Inc. -; -; This software is the property of Advanced Micro Devices, Inc (AMD) which -; specifically grants the user the right to modify, use and distribute this -; software provided this notice is not removed or altered. All other rights -; are reserved by AMD. -; -; AMD MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS -; SOFTWARE. IN NO EVENT SHALL AMD BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL -; DAMAGES IN CONNECTION WITH OR ARISING FROM THE FURNISHING, PERFORMANCE, OR -; USE OF THIS SOFTWARE. -; -; So that all may benefit from your experience, please report any problems -; or suggestions about this software to the 29K Technical Support Center at -; 800-29-29-AMD (800-292-9263) in the USA, or 0800-89-1131 in the UK, or -; 0031-11-1129 in Japan, toll free. The direct dial number is 512-462-4118. -; -; Advanced Micro Devices, Inc. -; 29K Support Products -; Mail Stop 573 -; 5900 E. Ben White Blvd. -; Austin, TX 78741 -; 800-292-9263 -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; - .file "crt0.s" -; crt0.s version 2.1-7 -; -; This module gets control from the OS. -; It saves away the Am29027 Mode register settings and -; then sets up the pointers to the resident spill and fill -; trap handlers. It then establishes argv and argc for passing -; to main. It then calls _main. If main returns, it calls _exit. -; -; void = start( ); -; NOTE - not C callable (no lead underscore) -; - .include "sys/sysmac.h" -; -; - .extern V_SPILL, V_FILL - .comm __29027Mode, 8 ; A shadow of the mode register - .comm __LibInit, 4 - .comm __environ, 4 ; Environment variables, currently none. - .text - .extern _main, _exit - .extern _memset - - .word 0 ; Terminating tag word - .global start -start: - sub gr1, gr1, 6 * 4 - asgeu V_SPILL, gr1, rab ; better not ever happen - add lr1, gr1, 6 * 4 -; -; Initialize the .bss section to zero by using the memset library function. -; The .bss initialization section below has been commented out as it breaks -; XRAY29K that has been released. The operators sizeof and startof create -; new sections that are not recognized by XRAY29k, but will be implemented -; in the next release (2.0). -; -; const lr4, $sizeof(.bss) ; get size of .bss section to zero out -; consth lr4, $sizeof(.bss) -; const lr2, $startof(.bss) ; Get start address of .bss section -; consth lr2, $startof(.bss) -; const lr0, _memset ; address of memset function -; consth lr0, _memset -; calli lr0, lr0 ; call memset function -; const lr3, 0 - -; Save the initial value of the Am29027's Mode register -; If your const tav,HIF_does @ asneq V_SYSCALL,gr1,gr1 @ jmpti tav,lr0 @ const tpc,_errno @ consth tpc,_errno @ store 0,0,tav,tpc @ jmpi lr0 @ constn v0,-1 not enter crt0 with value for Am29027's Mode register -; in gr96 and gr97, and also if the coprocessor is active uncomment the -; next 4 lines. -; const gr96, 0xfc00820 -; consth gr96, 0xfc00820 -; const gr97, 0x1375 -; store 1, 3, gr96, gr97 -; - const gr98, __29027Mode - consth gr98, __29027Mode - store 0, 0, gr96, gr98 - add gr98, gr98, 4 - store 0, 0, gr97, gr98 -; -; Now call the const tav,HIF_to @ asneq V_SYSCALL,gr1,gr1 @ jmpti tav,lr0 @ const tpc,_errno @ consth tpc,_errno @ store 0,0,tav,tpc @ jmpi lr0 @ constn v0,-1 setup the spill and fill trap handlers -; - const lr3, spill - consth lr3, spill - const lr2, V_SPILL - const tav,HIF_setvec @ asneq V_SYSCALL,gr1,gr1 - const lr3, fill - consth lr3, fill - const lr2, V_FILL - const tav,HIF_setvec @ asneq V_SYSCALL,gr1,gr1 -; -; Set up dividu handler, since native one don't work?! -; Set it up by hand (FIXME) since HIF_settrap doesn't work either! -; -; const lr3,Edividu -; consth lr3,Edividu -; -; const lr2,35 -; const tav,HIF_settrap @ asneq V_SYSCALL,gr1,gr1 -; asge 0x50,gr121,0 ; check whether it failed -; const lr2,0x8000008c ; abs addr of dividu trap handler on EB -; consth lr2,0x8000008c -; store 0,0,lr3,lr2 ; Clobber vector FIXME - -; -; Get the argv base address and calculate argc. -; - const tav,HIF_getargs @ asneq V_SYSCALL,gr1,gr1 - add lr3, v0, 0 ; argv - add lr4, v0, 0 - constn lr2, -1 -argcloop: ; scan for NULL terminator - load 0, 0, gr97, lr4 - add lr4, lr4, 4 - cpeq gr97, gr97, 0 - jmpf gr97, argcloop - add lr2, lr2, 1 -; -; Now call LibInit, if there is one. To aid runtime libraries -; that need to do some startup initialization, we have created -; a bss variable called LibInit. If the library doesn't need -; any run-time initialization, the variable is still 0. If the -; library does need run-time initialization, the library will -; contain a definition like -; void (*_LibInit)(void) = LibInitFunction; -; The linker will match up our bss LibInit with this data LibInit -; and the variable will not be 0. -; - const lr0, __LibInit - consth lr0, __LibInit - load 0, 0, lr0, lr0 - cpeq gr96, lr0, 0 - jmpt gr96, NoLibInit - nop - calli lr0, lr0 - nop -NoLibInit: -; -; call main, passing it 2 arguments. main( argc, argv ) -; - const lr0, _main - consth lr0, _main - calli lr0, lr0 - nop -; -; call exit -; - const lr0, _exit - consth lr0, _exit - calli lr0, lr0 - add lr2, gr96, 0 -; -; Should never get here, but just in case -; -loop: - const tav,HIF_exit @ asneq V_SYSCALL,gr1,gr1 - jmp loop - nop - .sbttl "Spill and Fill trap handlers" - .eject -; -; SPILL, FILL trap handlers -; -; Note that these Spill and Fill trap handlers allow the OS to -; assume that the only registers of use are between gr1 and rfb. -; Therefore, if the OS desires to, it may simply preserve from -; lr0 for (rfb-gr1)/4 registers when doing a context save. -; -; -; Here is the spill handler -; -; spill registers from [*gr1..*rab) -; and move rab downto where gr1 points -; -; rab must change before rfb for signals to work -; -; On entry: rfb - rab = windowsize, gr1 < rab -; Near the end: rfb - rab > windowsize, gr1 == rab -; On exit: rfb - rab = windowsize, gr1 == rab -; - .global spill -spill: - sub tav, rab, gr1 ; tav = number of bytes to spill - srl tav, tav, 2 ; change byte count to word count - sub tav, tav, 1 ; make count zero based - mtsr cr, tav ; set Count Remaining register - sub tav, rab, gr1 - sub tav, rfb, tav ; pull down free bound and save it in rab - add rab, gr1, 0 ; first pull down allocate bound - storem 0, 0, lr0, tav ; store lr0..lr(tav) into rfb - jmpi tpc ; return... - add rfb, tav, 0 -; -; Here is the fill handler -; -; fill registers from [*rfb..*lr1) -; and move rfb upto where lr1 points. -; -; rab must change before rfb for signals to work -; -; On entry: rfb - rab = windowsize, lr1 > rfb -; Near the end: rfb - rab < windowsize, lr1 == rab + windowsize -; On exit: rfb - rab = windowsize, lr1 == rfb -; - .global fill -fill: - const tav, 0x80 << 2 - or tav, tav, rfb ; tav = ((rfb>>2) | 0x80)<<2 == [rfb]<<2 - mtsr ipa, tav ; ipa = [rfb]<<2 == 1st reg to fill - ; gr0 is now the first reg to spill - sub tav, lr1, rfb ; tav = number of bytes to spill - add rab, rab, tav ; push up allocate bound - srl tav, tav, 2 ; change byte count to word count - sub tav, tav, 1 ; make count zero based - mtsr cr, tav ; set Count Remaining register - loadm 0, 0, gr0, rfb ; load registers - jmpi tpc ; return... - add rfb, lr1, 0 ; ... first pushing up free bound - - .end |