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Retro68/gcc/newlib/libc/sys/a29khif/signal.S
Wolfgang Thaller 1c3ad08d54 add libgloss and newlib 1.20.0 to gcc directory
2012-03-27 01:51:53 +02:00

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;@(#)signal.s 2.15 90/10/14 21:57:55, AMD
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Copyright 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 "signal.s"
; SigEntry is the address of an array of C-level user code signal handlers.
; They must return to the top-level before doing a sigret() return function.
; Nested signals are supported.
.extern V_SPILL, V_FILL
.extern fill ; In crt0.s
.align 4
.comm WindowSize, 4
.data
SigEntry:
.word 0 ; reserved
.word 0 ; adds. of #2 SIGINT handler
.word 0 ; reserved
.word 0 ; reserved
.word 0 ; reserved
.word 0 ; reserved
.word 0 ; reserved
.word 0 ; adds. of #8 SIGFPE handler
.text
.reg v0, gr96
.reg v1, gr97
.reg v2, gr98
.reg v3, gr99
.reg tav, gr121
.reg tpc, gr122
.reg lrp, gr123
.reg slp, gr124
.reg msp, gr125
.reg rab, gr126
.reg rfb, gr127
;=================================================================== setjmp()
; int
; setjmp(label_t jmpbuf)
; {
; *jmpbuf = {gr1, msp, lr0, lr1};
; return 0;
; }
;
.global _setjmp
_setjmp:
store 0, 0, gr1, lr2
add lr2, lr2, 4
store 0, 0, msp, lr2
add lr2, lr2, 4
store 0, 0, lr0, lr2
add lr2, lr2, 4
store 0, 0, lr1, lr2
jmpi lr0
const v0, 0
;
;==================================================================== longjmp()
; int
; longjmp(label_t jmpbuf, int value)
; {
; /* BUG: check for this
; if (msp > jmpbuf->msp || gr1 > jmpbuf->gr1)
; longjmperror();
; */
;
; gr1 = jmpbuf->gr1;
; lr2addr = jmpbuf->gr1 + 8;
; msp = jmpbuf->msp;
;
; /* saved lr1 is invalid if saved lr2addr > rfb */
; if (lr2addr > rfb) {
; /*
; * None of the registers are useful.
; * Set rfb to lr2addr - 512 & rab to rfb - 512.
; * the FILL assert will take care of filling
; */
; lr1 = jmpbuf->lr1;
; rab = lr2addr - windowsize;
; rfb = lr2addr;
; }
;
; lr0 = jmpbuf->lr0;
; if (rfb < lr1)
; raise V_FILL;
; return value;
; }
;
.global _longjmp
_longjmp:
load 0, 0, tav, lr2 ; copy in gr1
add v1, lr2, 4 ; v1 points to msp
; make sure we return a non-zero value
cpeq v0, lr3, 0
srl v0, v0, 31
or v0, lr3, v0
add gr1, tav, 0 ; now update gr1
add tav, tav, 8 ; calculate lr2addr
load 0, 0, msp, v1 ; update msp from jmpbuf
cpleu v3, tav, rfb ; if (lr2addr > rfb)
jmpt v3, $1 ; {
add v1, v1, 4 ; v1 points to lr0
add v2, v1, 4 ; v2 points to lr1
load 0, 0, lr1, v2 ; lr1 = value from jmpbuf
sub v3, rfb, rab ;
sub rab, tav, v3 ; rab = lr2addr - windowsize
add rfb, tav, 0 ; rfb = lr2addr
$1: ; }
load 0, 0, lr0, v1
jmpi lr0
asgeu V_FILL, rfb, lr1 ; may fill from rfb to lr1
;
;================================================================== sigcode
; About to deliver a signal to a user mode signal handler.
; msp+(15*4) = signal_number
; msp+(14*4) = gr1
; msp+(13*4) = rab
; msp+(12*4) = PC0
; msp+(11*4) = PC1
; msp+(10*4) = PC2
; msp+( 9*4) = CHA
; msp+( 8*4) = CHD
; msp+( 7*4) = CHC
; msp+( 6*4) = ALU
; msp+( 5*4) = OPS
; msp+( 4*4) = gr121
; msp+( 3*4) = gr99
; msp+( 2*4) = gr98
; msp+( 1*4) = gr97
; msp = gr96
; The state of all the registers (except for msp, chc and rab)
; is the same as when the process was interrupted.
;
; We must make the stack and window consistent before calling the handler
; The orignal rab value is on the stack. The interrupt handler placed
; rfb-Windowsize in rab. This is required to support nested interrupts.
;
; Note that the window becomes incosistent only during certain
; critical sections in spill, fill, longjmp and sigcode.
; rfb - rab > windowsize => we are in spill
; rfb - rab < windowsize => we are in fill
; gr1 + 8 > rfb => we are in long-longjmp case
; In case of spill, fill and lonjmp; rab is modified first,
; so if we are in one of these critical sections,
; we set rab to rfb - WINDOWSIZE.
;
.equ SIGCTX_SIZE, (16)*4
.equ SIGCTX_SIGNUMB, (15)*4
.equ SIGCTX_GR1_OFFSET, (14)*4
.equ SIGCTX_RAB_OFFSET, (13)*4
.equ SIGCTX_PC0_OFFSET, (12)*4
.equ SIGCTX_PC1_OFFSET, (11)*4
.equ SIGCTX_PC2_OFFSET, (10)*4
.equ SIGCTX_CHC_OFFSET, (7)*4
.equ SIGCTX_OPS_OFFSET, (5)*4
.equ SIGCTX_TAV_OFFSET, (4)*4
.global sigcode
sigcode:
; -------------------------------------------------------- R-Stack fixup
const v0, WindowSize ; get register cache size
consth v0, WindowSize
load 0, 0, v0, v0
add v2, msp, SIGCTX_RAB_OFFSET
load 0, 0, v2, v2 ; get interrupted rab value
sub v1, rfb, v2 ; determine if rfb-rab <= WINDOW_SIZE
cpgeu v1, v1, v0 ;
jmpt v1, nfill ; jmp if spill or 'normal' interrupt
add v1, gr1, 8
cpgt v1, v1, rfb ; interrupted longjmp can look like fill
jmpf v1, nfill ; test for long-longjmp interruption
nop ; jmp if gr1+8 <= rfb
; Fixup signal stack to re-start interrupted fill
; backup pc1 -- this is needed for the partial fill case.
; Clear chc so an interrupted load/store does not restart.
; Reset rab to a window distance below rfb, rab shall be
; decremented again on re-starting the interrupted fill.
; The interrupt handler set rab=rfb-WindowSize.
;
add v0, msp, SIGCTX_RAB_OFFSET
store 0, 0, rab, v0 ; re-store (rfb-WindowSize) for rab
const v2, fill
consth v2, fill
add v0, msp, SIGCTX_PC1_OFFSET
store 0, 0, v2, v0
sub v2, v2, 4 ; determine pc0
add v0, msp, SIGCTX_PC0_OFFSET
store 0, 0, v2, v0
const v2, 0 ; clear chc
add v0, msp, SIGCTX_CHC_OFFSET
store 0, 0, v2, v0
nfill:
cpgt v0, gr1, rfb ; if gr1 > rfb then gr1 = rfb
jmpt v0, lower
cplt v0, gr1, rab ; if gr1 < rab then gr1 = rab
jmpt v0, raise
nop
; -------------------------------------------------------- save_regs
sig1: sub msp, msp, (4+2+25)*4 ; reserve space for regs
mfsr gr96, ipc
mfsr gr97, ipa
mfsr gr98, ipb
mfsr gr99, q
mtsrim cr, 4-1
storem 0, 0, gr96, msp
; "push" registers stack support
add gr96, lr1, 0
add gr97, rfb, 0
mtsrim cr, 2-1
add gr99, msp, 2*4
storem 0, 0, gr96, gr99
; "push" remaining global registers
mtsrim cr, 25-1 ; gr100-gr124
add gr96, msp, (4+2)*4
storem 0, 0, gr100, gr96
;
; -------------------------------------------------------- Dummy Call
.equ RALLOC, 4*4 ; make space for function calls
add v0, rfb, 0 ; store original rfb
sub gr1, gr1, RALLOC
asgeu V_SPILL, gr1, rab
add lr1, v0, 0 ; set lr1 = original rfb
add v1, msp, (4+2+25)*4 + SIGCTX_SIGNUMB
load 0, 0, lr2, v1 ; restore signal number
sub v1, lr2, 1 ; get handler index
sll v1, v1, 2 ; point to addresses
;
; -------------------------------------------------------- call C-level
; Handler must not use HIF services other than the _sigret() type.
const v0, SigEntry
consth v0, SigEntry
add v0, v0, v1
load 0, 0, v0, v0 ; determine if handler registered
cpeq v1, v0, 0
jmpt v1, NoHandler
nop
calli lr0, v0 ; call C-level signal handler
nop
;
; -------------------------------------------------------- default return
NoHandler:
jmp __sigdfl
nop
; -------------------------------------------------------- support bits
lower: sll gr1, rfb, 0
jmp sig1
nop
raise: sll gr1, rab, 0
jmp sig1
nop
/*
; -------------------------------------------------------- repair_regs
mtsrim cr, 4-1
loadm 0, 0, gr96, msp
mtsr ipc, gr96
mtsr ipa, gr97
mtsr ipb, gr98
mtsr Q, gr99
; "pop" registers stack support
mtsrim cr, 2-1
add gr99, msp, 2*4
loadm 0, 0, gr96, gr99
add lr1, gr96, 0
add rfb, gr97, 0
; "pop" remaining global registers
mtsrim cr, 25-1 ; gr100-gr124
add gr96, msp, (4+2)*4
loadm 0, 0, gr100, gr96
add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
; -------------------------------------------------------- end repair
*/
; ======================================================== _sigret()
.global __sigret
__sigret:
; repair_regs
; -------------------------------------------------------- repair_regs
mtsrim cr, 4-1
loadm 0, 0, gr96, msp
mtsr ipc, gr96
mtsr ipa, gr97
mtsr ipb, gr98
mtsr q, gr99
; "pop" registers stack support
mtsrim cr, 2-1
add gr99, msp, 2*4
loadm 0, 0, gr96, gr99
add lr1, gr96, 0
add rfb, gr97, 0
; "pop" remaining global registers
mtsrim cr, 25-1 ; gr100-gr124
add gr96, msp, (4+2)*4
loadm 0, 0, gr100, gr96
add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
; -------------------------------------------------------- end repair
const tav, 323 ; HIF _sigret
asneq 69, gr1,gr1
halt ; commit suicide if returns
; ======================================================== _sigdfl()
.global __sigdfl
__sigdfl:
; repair_regs
; -------------------------------------------------------- repair_regs
mtsrim cr, 4-1
loadm 0, 0, gr96, msp
mtsr ipc, gr96
mtsr ipa, gr97
mtsr ipb, gr98
mtsr q, gr99
; "pop" registers stack support
mtsrim cr, 2-1
add gr99, msp, 2*4
loadm 0, 0, gr96, gr99
add lr1, gr96, 0
add rfb, gr97, 0
; "pop" remaining global registers
mtsrim cr, 25-1 ; gr100-gr124
add gr96, msp, (4+2)*4
loadm 0, 0, gr100, gr96
add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
; -------------------------------------------------------- end repair
const tav, 322 ; HIF _sigdfl
asneq 69, gr1,gr1
halt ; commit suicide if returns
; ======================================================== _sigrep()
__sigrep:
.global __sigrep
; repair_regs
; -------------------------------------------------------- repair_regs
mtsrim cr, 4-1
loadm 0, 0, gr96, msp
mtsr ipc, gr96
mtsr ipa, gr97
mtsr ipb, gr98
mtsr q, gr99
; "pop" registers stack support
mtsrim cr, 2-1
add gr99, msp, 2*4
loadm 0, 0, gr96, gr99
add lr1, gr96, 0
add rfb, gr97, 0
; "pop" remaining global registers
mtsrim cr, 25-1 ; gr100-gr124
add gr96, msp, (4+2)*4
loadm 0, 0, gr100, gr96
add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
; -------------------------------------------------------- end repair
const tav, 324 ; HIF _sigrep
asneq 69, gr1,gr1
halt ; commit suicide if returns
; ======================================================== _sigskp()
.global __sigskp
__sigskp:
; repair_regs
; -------------------------------------------------------- repair_regs
mtsrim cr, 4-1
loadm 0, 0, gr96, msp
mtsr ipc, gr96
mtsr ipa, gr97
mtsr ipb, gr98
mtsr q, gr99
; "pop" registers stack support
mtsrim cr, 2-1
add gr99, msp, 2*4
loadm 0, 0, gr96, gr99
add lr1, gr96, 0
add rfb, gr97, 0
; "pop" remaining global registers
mtsrim cr, 25-1 ; gr100-gr124
add gr96, msp, (4+2)*4
loadm 0, 0, gr100, gr96
add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
; -------------------------------------------------------- end repair
const tav, 325 ; HIF _sigskp
asneq 69, gr1,gr1
halt ; commit suicide if returns
; ======================================================== _sendsig()
; lr2 = signal number
.global _raise
.global __sendsig
_raise:
__sendsig:
const tav, 326 ; HIF sendsig
asneq 69, gr1,gr1
jmpi lr0
nop
;
; ======================================================== signal()
; lr2 = signal number
; lr3 = handler address
.global _signal
_signal:
; the memory variable WindowSize must be initalised at the
; start when rfb and rab are a window size apart.
const v0, WindowSize ; get register cache size
consth v0, WindowSize
load 0, 0, v1, v0
cpeq v1, v1, 0
jmpf v1, WindowSizeOK
sub v1, rfb, rab ; rfb-rab = WINDOW_SIZE
store 0, 0, v1, v0
WindowSizeOK:
const v1, SigEntry
consth v1, SigEntry
sub v3, lr2, 1 ; get handler index
sll v3, v3, 2 ; pointer to addresses
add v1, v1, v3
store 0,0, lr3, v1 ; save new handler
const lr2, sigcode
consth lr2, sigcode
;Fall through to __signal
; ======================================================== _signal()
.global __signal
__signal:
const tav, 321 ; HIF signal
asneq 69, gr1,gr1
jmpi lr0
nop
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