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1010 |
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;@(#)signal.s 2.15 90/10/14 21:57:55, AMD
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Copyright 1990 Advanced Micro Devices, Inc.
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;
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; This software is the property of Advanced Micro Devices, Inc (AMD) which
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; specifically grants the user the right to modify, use and distribute this
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; software provided this notice is not removed or altered. All other rights
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; are reserved by AMD.
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;
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; AMD MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS
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; SOFTWARE. IN NO EVENT SHALL AMD BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL
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; DAMAGES IN CONNECTION WITH OR ARISING FROM THE FURNISHING, PERFORMANCE, OR
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; USE OF THIS SOFTWARE.
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;
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; So that all may benefit from your experience, please report any problems
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; or suggestions about this software to the 29K Technical Support Center at
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; 800-29-29-AMD (800-292-9263) in the USA, or 0800-89-1131 in the UK, or
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; 0031-11-1129 in Japan, toll free. The direct dial number is 512-462-4118.
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;
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; Advanced Micro Devices, Inc.
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; 29K Support Products
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; Mail Stop 573
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; 5900 E. Ben White Blvd.
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; Austin, TX 78741
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; 800-292-9263
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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.file "signal.s"
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; SigEntry is the address of an array of C-level user code signal handlers.
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; They must return to the top-level before doing a sigret() return function.
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; Nested signals are supported.
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.extern V_SPILL, V_FILL
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.extern fill ; In crt0.s
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.align 4
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.comm WindowSize, 4
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.data
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SigEntry:
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.word 0 ; reserved
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.word 0 ; adds. of #2 SIGINT handler
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.word 0 ; reserved
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.word 0 ; reserved
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.word 0 ; reserved
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.word 0 ; reserved
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.word 0 ; reserved
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.word 0 ; adds. of #8 SIGFPE handler
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.text
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.reg v0, gr96
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.reg v1, gr97
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.reg v2, gr98
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.reg v3, gr99
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.reg tav, gr121
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.reg tpc, gr122
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.reg lrp, gr123
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.reg slp, gr124
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.reg msp, gr125
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.reg rab, gr126
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.reg rfb, gr127
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;=================================================================== setjmp()
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; int
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; setjmp(label_t jmpbuf)
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; {
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; *jmpbuf = {gr1, msp, lr0, lr1};
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; return 0;
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; }
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;
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.global _setjmp
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_setjmp:
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store 0, 0, gr1, lr2
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add lr2, lr2, 4
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store 0, 0, msp, lr2
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add lr2, lr2, 4
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store 0, 0, lr0, lr2
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add lr2, lr2, 4
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store 0, 0, lr1, lr2
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jmpi lr0
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const v0, 0
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;
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;==================================================================== longjmp()
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; int
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; longjmp(label_t jmpbuf, int value)
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; {
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; /* BUG: check for this
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; if (msp > jmpbuf->msp || gr1 > jmpbuf->gr1)
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; longjmperror();
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; */
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;
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; gr1 = jmpbuf->gr1;
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; lr2addr = jmpbuf->gr1 + 8;
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; msp = jmpbuf->msp;
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;
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; /* saved lr1 is invalid if saved lr2addr > rfb */
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; if (lr2addr > rfb) {
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; /*
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; * None of the registers are useful.
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; * Set rfb to lr2addr - 512 & rab to rfb - 512.
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; * the FILL assert will take care of filling
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; */
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; lr1 = jmpbuf->lr1;
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; rab = lr2addr - windowsize;
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; rfb = lr2addr;
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; }
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;
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; lr0 = jmpbuf->lr0;
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; if (rfb < lr1)
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; raise V_FILL;
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; return value;
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; }
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;
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.global _longjmp
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_longjmp:
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load 0, 0, tav, lr2 ; copy in gr1
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add v1, lr2, 4 ; v1 points to msp
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; make sure we return a non-zero value
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cpeq v0, lr3, 0
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srl v0, v0, 31
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or v0, lr3, v0
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add gr1, tav, 0 ; now update gr1
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add tav, tav, 8 ; calculate lr2addr
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load 0, 0, msp, v1 ; update msp from jmpbuf
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cpleu v3, tav, rfb ; if (lr2addr > rfb)
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jmpt v3, $1 ; {
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add v1, v1, 4 ; v1 points to lr0
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add v2, v1, 4 ; v2 points to lr1
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load 0, 0, lr1, v2 ; lr1 = value from jmpbuf
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sub v3, rfb, rab ;
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sub rab, tav, v3 ; rab = lr2addr - windowsize
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add rfb, tav, 0 ; rfb = lr2addr
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$1: ; }
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load 0, 0, lr0, v1
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jmpi lr0
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asgeu V_FILL, rfb, lr1 ; may fill from rfb to lr1
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;
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;================================================================== sigcode
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; About to deliver a signal to a user mode signal handler.
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; msp+(15*4) = signal_number
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; msp+(14*4) = gr1
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; msp+(13*4) = rab
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; msp+(12*4) = PC0
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; msp+(11*4) = PC1
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; msp+(10*4) = PC2
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; msp+( 9*4) = CHA
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; msp+( 8*4) = CHD
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; msp+( 7*4) = CHC
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; msp+( 6*4) = ALU
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; msp+( 5*4) = OPS
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; msp+( 4*4) = gr121
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; msp+( 3*4) = gr99
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; msp+( 2*4) = gr98
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; msp+( 1*4) = gr97
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; msp = gr96
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; The state of all the registers (except for msp, chc and rab)
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; is the same as when the process was interrupted.
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;
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; We must make the stack and window consistent before calling the handler
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; The orignal rab value is on the stack. The interrupt handler placed
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; rfb-Windowsize in rab. This is required to support nested interrupts.
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;
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; Note that the window becomes incosistent only during certain
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; critical sections in spill, fill, longjmp and sigcode.
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; rfb - rab > windowsize => we are in spill
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; rfb - rab < windowsize => we are in fill
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; gr1 + 8 > rfb => we are in long-longjmp case
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; In case of spill, fill and lonjmp; rab is modified first,
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; so if we are in one of these critical sections,
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; we set rab to rfb - WINDOWSIZE.
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;
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.equ SIGCTX_SIZE, (16)*4
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.equ SIGCTX_SIGNUMB, (15)*4
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.equ SIGCTX_GR1_OFFSET, (14)*4
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.equ SIGCTX_RAB_OFFSET, (13)*4
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.equ SIGCTX_PC0_OFFSET, (12)*4
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.equ SIGCTX_PC1_OFFSET, (11)*4
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.equ SIGCTX_PC2_OFFSET, (10)*4
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.equ SIGCTX_CHC_OFFSET, (7)*4
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.equ SIGCTX_OPS_OFFSET, (5)*4
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.equ SIGCTX_TAV_OFFSET, (4)*4
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.global sigcode
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sigcode:
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; -------------------------------------------------------- R-Stack fixup
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const v0, WindowSize ; get register cache size
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consth v0, WindowSize
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load 0, 0, v0, v0
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add v2, msp, SIGCTX_RAB_OFFSET
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load 0, 0, v2, v2 ; get interrupted rab value
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sub v1, rfb, v2 ; determine if rfb-rab <= WINDOW_SIZE
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cpgeu v1, v1, v0 ;
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jmpt v1, nfill ; jmp if spill or 'normal' interrupt
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add v1, gr1, 8
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cpgt v1, v1, rfb ; interrupted longjmp can look like fill
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jmpf v1, nfill ; test for long-longjmp interruption
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nop ; jmp if gr1+8 <= rfb
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; Fixup signal stack to re-start interrupted fill
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; backup pc1 -- this is needed for the partial fill case.
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; Clear chc so an interrupted load/store does not restart.
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; Reset rab to a window distance below rfb, rab shall be
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; decremented again on re-starting the interrupted fill.
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; The interrupt handler set rab=rfb-WindowSize.
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;
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add v0, msp, SIGCTX_RAB_OFFSET
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store 0, 0, rab, v0 ; re-store (rfb-WindowSize) for rab
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const v2, fill
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consth v2, fill
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add v0, msp, SIGCTX_PC1_OFFSET
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store 0, 0, v2, v0
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sub v2, v2, 4 ; determine pc0
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add v0, msp, SIGCTX_PC0_OFFSET
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store 0, 0, v2, v0
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const v2, 0 ; clear chc
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add v0, msp, SIGCTX_CHC_OFFSET
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store 0, 0, v2, v0
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nfill:
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cpgt v0, gr1, rfb ; if gr1 > rfb then gr1 = rfb
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jmpt v0, lower
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cplt v0, gr1, rab ; if gr1 < rab then gr1 = rab
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jmpt v0, raise
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nop
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; -------------------------------------------------------- save_regs
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sig1: sub msp, msp, (4+2+25)*4 ; reserve space for regs
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mfsr gr96, ipc
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mfsr gr97, ipa
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mfsr gr98, ipb
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mfsr gr99, q
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mtsrim cr, 4-1
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storem 0, 0, gr96, msp
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; "push" registers stack support
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add gr96, lr1, 0
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add gr97, rfb, 0
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mtsrim cr, 2-1
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add gr99, msp, 2*4
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storem 0, 0, gr96, gr99
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; "push" remaining global registers
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mtsrim cr, 25-1 ; gr100-gr124
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add gr96, msp, (4+2)*4
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storem 0, 0, gr100, gr96
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;
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; -------------------------------------------------------- Dummy Call
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.equ RALLOC, 4*4 ; make space for function calls
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add v0, rfb, 0 ; store original rfb
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sub gr1, gr1, RALLOC
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asgeu V_SPILL, gr1, rab
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add lr1, v0, 0 ; set lr1 = original rfb
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add v1, msp, (4+2+25)*4 + SIGCTX_SIGNUMB
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load 0, 0, lr2, v1 ; restore signal number
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sub v1, lr2, 1 ; get handler index
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sll v1, v1, 2 ; point to addresses
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;
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; -------------------------------------------------------- call C-level
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; Handler must not use HIF services other than the _sigret() type.
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const v0, SigEntry
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consth v0, SigEntry
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add v0, v0, v1
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load 0, 0, v0, v0 ; determine if handler registered
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cpeq v1, v0, 0
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jmpt v1, NoHandler
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nop
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calli lr0, v0 ; call C-level signal handler
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nop
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;
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; -------------------------------------------------------- default return
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NoHandler:
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jmp __sigdfl
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nop
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; -------------------------------------------------------- support bits
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lower: sll gr1, rfb, 0
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jmp sig1
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nop
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raise: sll gr1, rab, 0
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jmp sig1
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nop
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/*
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; -------------------------------------------------------- repair_regs
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mtsrim cr, 4-1
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loadm 0, 0, gr96, msp
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mtsr ipc, gr96
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mtsr ipa, gr97
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mtsr ipb, gr98
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mtsr Q, gr99
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; "pop" registers stack support
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mtsrim cr, 2-1
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add gr99, msp, 2*4
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loadm 0, 0, gr96, gr99
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add lr1, gr96, 0
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add rfb, gr97, 0
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; "pop" remaining global registers
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mtsrim cr, 25-1 ; gr100-gr124
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add gr96, msp, (4+2)*4
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loadm 0, 0, gr100, gr96
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add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
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| 298 |
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; -------------------------------------------------------- end repair
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*/
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| 300 |
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| 301 |
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; ======================================================== _sigret()
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| 302 |
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.global __sigret
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| 303 |
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__sigret:
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| 304 |
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; repair_regs
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| 305 |
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; -------------------------------------------------------- repair_regs
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| 306 |
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mtsrim cr, 4-1
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| 307 |
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loadm 0, 0, gr96, msp
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| 308 |
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mtsr ipc, gr96
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mtsr ipa, gr97
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mtsr ipb, gr98
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mtsr q, gr99
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| 312 |
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; "pop" registers stack support
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| 313 |
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mtsrim cr, 2-1
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| 314 |
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add gr99, msp, 2*4
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loadm 0, 0, gr96, gr99
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| 316 |
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add lr1, gr96, 0
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| 317 |
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add rfb, gr97, 0
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| 318 |
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; "pop" remaining global registers
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| 319 |
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mtsrim cr, 25-1 ; gr100-gr124
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| 320 |
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add gr96, msp, (4+2)*4
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| 321 |
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loadm 0, 0, gr100, gr96
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| 322 |
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add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
|
| 323 |
|
|
; -------------------------------------------------------- end repair
|
| 324 |
|
|
const tav, 323 ; HIF _sigret
|
| 325 |
|
|
asneq 69, gr1,gr1
|
| 326 |
|
|
halt ; commit suicide if returns
|
| 327 |
|
|
|
| 328 |
|
|
; ======================================================== _sigdfl()
|
| 329 |
|
|
.global __sigdfl
|
| 330 |
|
|
__sigdfl:
|
| 331 |
|
|
; repair_regs
|
| 332 |
|
|
; -------------------------------------------------------- repair_regs
|
| 333 |
|
|
mtsrim cr, 4-1
|
| 334 |
|
|
loadm 0, 0, gr96, msp
|
| 335 |
|
|
mtsr ipc, gr96
|
| 336 |
|
|
mtsr ipa, gr97
|
| 337 |
|
|
mtsr ipb, gr98
|
| 338 |
|
|
mtsr q, gr99
|
| 339 |
|
|
; "pop" registers stack support
|
| 340 |
|
|
mtsrim cr, 2-1
|
| 341 |
|
|
add gr99, msp, 2*4
|
| 342 |
|
|
loadm 0, 0, gr96, gr99
|
| 343 |
|
|
add lr1, gr96, 0
|
| 344 |
|
|
add rfb, gr97, 0
|
| 345 |
|
|
; "pop" remaining global registers
|
| 346 |
|
|
mtsrim cr, 25-1 ; gr100-gr124
|
| 347 |
|
|
add gr96, msp, (4+2)*4
|
| 348 |
|
|
loadm 0, 0, gr100, gr96
|
| 349 |
|
|
add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
|
| 350 |
|
|
; -------------------------------------------------------- end repair
|
| 351 |
|
|
const tav, 322 ; HIF _sigdfl
|
| 352 |
|
|
asneq 69, gr1,gr1
|
| 353 |
|
|
halt ; commit suicide if returns
|
| 354 |
|
|
|
| 355 |
|
|
; ======================================================== _sigrep()
|
| 356 |
|
|
__sigrep:
|
| 357 |
|
|
.global __sigrep
|
| 358 |
|
|
; repair_regs
|
| 359 |
|
|
; -------------------------------------------------------- repair_regs
|
| 360 |
|
|
mtsrim cr, 4-1
|
| 361 |
|
|
loadm 0, 0, gr96, msp
|
| 362 |
|
|
mtsr ipc, gr96
|
| 363 |
|
|
mtsr ipa, gr97
|
| 364 |
|
|
mtsr ipb, gr98
|
| 365 |
|
|
mtsr q, gr99
|
| 366 |
|
|
; "pop" registers stack support
|
| 367 |
|
|
mtsrim cr, 2-1
|
| 368 |
|
|
add gr99, msp, 2*4
|
| 369 |
|
|
loadm 0, 0, gr96, gr99
|
| 370 |
|
|
add lr1, gr96, 0
|
| 371 |
|
|
add rfb, gr97, 0
|
| 372 |
|
|
; "pop" remaining global registers
|
| 373 |
|
|
mtsrim cr, 25-1 ; gr100-gr124
|
| 374 |
|
|
add gr96, msp, (4+2)*4
|
| 375 |
|
|
loadm 0, 0, gr100, gr96
|
| 376 |
|
|
add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
|
| 377 |
|
|
; -------------------------------------------------------- end repair
|
| 378 |
|
|
const tav, 324 ; HIF _sigrep
|
| 379 |
|
|
asneq 69, gr1,gr1
|
| 380 |
|
|
halt ; commit suicide if returns
|
| 381 |
|
|
|
| 382 |
|
|
; ======================================================== _sigskp()
|
| 383 |
|
|
.global __sigskp
|
| 384 |
|
|
__sigskp:
|
| 385 |
|
|
; repair_regs
|
| 386 |
|
|
; -------------------------------------------------------- repair_regs
|
| 387 |
|
|
mtsrim cr, 4-1
|
| 388 |
|
|
loadm 0, 0, gr96, msp
|
| 389 |
|
|
mtsr ipc, gr96
|
| 390 |
|
|
mtsr ipa, gr97
|
| 391 |
|
|
mtsr ipb, gr98
|
| 392 |
|
|
mtsr q, gr99
|
| 393 |
|
|
; "pop" registers stack support
|
| 394 |
|
|
mtsrim cr, 2-1
|
| 395 |
|
|
add gr99, msp, 2*4
|
| 396 |
|
|
loadm 0, 0, gr96, gr99
|
| 397 |
|
|
add lr1, gr96, 0
|
| 398 |
|
|
add rfb, gr97, 0
|
| 399 |
|
|
; "pop" remaining global registers
|
| 400 |
|
|
mtsrim cr, 25-1 ; gr100-gr124
|
| 401 |
|
|
add gr96, msp, (4+2)*4
|
| 402 |
|
|
loadm 0, 0, gr100, gr96
|
| 403 |
|
|
add msp, msp, (4+2+25)*4 ; repair msp to save_regs entry value
|
| 404 |
|
|
; -------------------------------------------------------- end repair
|
| 405 |
|
|
const tav, 325 ; HIF _sigskp
|
| 406 |
|
|
asneq 69, gr1,gr1
|
| 407 |
|
|
halt ; commit suicide if returns
|
| 408 |
|
|
|
| 409 |
|
|
; ======================================================== _sendsig()
|
| 410 |
|
|
; lr2 = signal number
|
| 411 |
|
|
.global _raise
|
| 412 |
|
|
.global __sendsig
|
| 413 |
|
|
_raise:
|
| 414 |
|
|
__sendsig:
|
| 415 |
|
|
const tav, 326 ; HIF sendsig
|
| 416 |
|
|
asneq 69, gr1,gr1
|
| 417 |
|
|
jmpi lr0
|
| 418 |
|
|
nop
|
| 419 |
|
|
|
| 420 |
|
|
;
|
| 421 |
|
|
; ======================================================== signal()
|
| 422 |
|
|
; lr2 = signal number
|
| 423 |
|
|
; lr3 = handler address
|
| 424 |
|
|
.global _signal
|
| 425 |
|
|
_signal:
|
| 426 |
|
|
; the memory variable WindowSize must be initalised at the
|
| 427 |
|
|
; start when rfb and rab are a window size apart.
|
| 428 |
|
|
const v0, WindowSize ; get register cache size
|
| 429 |
|
|
consth v0, WindowSize
|
| 430 |
|
|
load 0, 0, v1, v0
|
| 431 |
|
|
cpeq v1, v1, 0
|
| 432 |
|
|
jmpf v1, WindowSizeOK
|
| 433 |
|
|
sub v1, rfb, rab ; rfb-rab = WINDOW_SIZE
|
| 434 |
|
|
store 0, 0, v1, v0
|
| 435 |
|
|
WindowSizeOK:
|
| 436 |
|
|
const v1, SigEntry
|
| 437 |
|
|
consth v1, SigEntry
|
| 438 |
|
|
sub v3, lr2, 1 ; get handler index
|
| 439 |
|
|
sll v3, v3, 2 ; pointer to addresses
|
| 440 |
|
|
add v1, v1, v3
|
| 441 |
|
|
store 0,0, lr3, v1 ; save new handler
|
| 442 |
|
|
|
| 443 |
|
|
const lr2, sigcode
|
| 444 |
|
|
consth lr2, sigcode
|
| 445 |
|
|
;Fall through to __signal
|
| 446 |
|
|
; ======================================================== _signal()
|
| 447 |
|
|
.global __signal
|
| 448 |
|
|
__signal:
|
| 449 |
|
|
const tav, 321 ; HIF signal
|
| 450 |
|
|
asneq 69, gr1,gr1
|
| 451 |
|
|
jmpi lr0
|
| 452 |
|
|
nop
|
