/* Setjmp and longjmp for mmix.
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/* Setjmp and longjmp for mmix.
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Copyright (C) 2001 Hans-Peter Nilsson
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Copyright (C) 2001 Hans-Peter Nilsson
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Permission to use, copy, modify, and distribute this software is
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Permission to use, copy, modify, and distribute this software is
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freely granted, provided that the above copyright notice, this notice
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freely granted, provided that the above copyright notice, this notice
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and the following disclaimer are preserved with no changes.
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and the following disclaimer are preserved with no changes.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE.
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PURPOSE.
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jmp_buf[5]:
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jmp_buf[5]:
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0: fp
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0: fp
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1: rJ (return-address)
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1: rJ (return-address)
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2: sp
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2: sp
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3: rO *before* the setjmp call.
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3: rO *before* the setjmp call.
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4: temporary storage. Reserved between setjmp and longjmp. */
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4: temporary storage. Reserved between setjmp and longjmp. */
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#ifdef __MMIX_ABI_GNU__
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#ifdef __MMIX_ABI_GNU__
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#define arg1 $231
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#define arg1 $231
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#define arg2 $232
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#define arg2 $232
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#define outret $231
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#define outret $231
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#define popval 0
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#define popval 0
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#else
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#else
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#define arg1 $0
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#define arg1 $0
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#define arg2 $1
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#define arg2 $1
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#define outret $0
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#define outret $0
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#define popval 1
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#define popval 1
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#endif
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#endif
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.section .text.setjmp,"ax",@progbits
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.section .text.setjmp,"ax",@progbits
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.global setjmp
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.global setjmp
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setjmp:
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setjmp:
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% Store fp, sp and return address. Recycle the static-chain and
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% Store fp, sp and return address. Recycle the static-chain and
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% structure-return registers as temporary register, since we need to keep
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% structure-return registers as temporary register, since we need to keep
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% the jmp_buf (parameter 1) and the return address across a "POP".
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% the jmp_buf (parameter 1) and the return address across a "POP".
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SET $251,arg1
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SET $251,arg1
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STOU $253,$251,0
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STOU $253,$251,0
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GET $252,rJ
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GET $252,rJ
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STOU $252,$251,8
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STOU $252,$251,8
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STOU $254,$251,16
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STOU $254,$251,16
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SETL outret,0
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SETL outret,0
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% Jump through hoops to get the value of rO *before* the setjmp call.
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% Jump through hoops to get the value of rO *before* the setjmp call.
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GETA $255,0f
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GETA $255,0f
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PUT rJ,$255
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PUT rJ,$255
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POP popval,0
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POP popval,0
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0:
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0:
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GET $255,rO
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GET $255,rO
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STOU $255,$251,24
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STOU $255,$251,24
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GO $255,$252,0
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GO $255,$252,0
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.size setjmp,.-setjmp
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.size setjmp,.-setjmp
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.section .text.longjmp,"ax",@progbits
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.section .text.longjmp,"ax",@progbits
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.global longjmp
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.global longjmp
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longjmp:
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longjmp:
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% Reset arg2 to 1 if it is 0 (see longjmp(2)) and store it in jmp_buf.
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% Reset arg2 to 1 if it is 0 (see longjmp(2)) and store it in jmp_buf.
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% Save arg1 in a global register, since it will be destroyed by the POPs
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% Save arg1 in a global register, since it will be destroyed by the POPs
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% (in the mmixware ABI).
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% (in the mmixware ABI).
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CSZ arg2,arg2,1
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CSZ arg2,arg2,1
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STOU arg2,arg1,32
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STOU arg2,arg1,32
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SET $251,arg1
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SET $251,arg1
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% Loop and "POP 0,0" until rO is the expected value, like
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% Loop and "POP 0,0" until rO is the expected value, like
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% the expansion of nonlocal_goto_receiver, except that we put the return
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% the expansion of nonlocal_goto_receiver, except that we put the return
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% value in the right register and make sure that the POP causes it to
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% value in the right register and make sure that the POP causes it to
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% enter the right return-value register as seen by the caller. For the
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% enter the right return-value register as seen by the caller. For the
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% GNU ABI, it is unnecessary to do this in the loop and perhaps the memory
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% GNU ABI, it is unnecessary to do this in the loop and perhaps the memory
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% access can be hoisted outside the loop, but this is safe and simple and
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% access can be hoisted outside the loop, but this is safe and simple and
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% I see no need to optimize longjmps.
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% I see no need to optimize longjmps.
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GETA $255,0f
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GETA $255,0f
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PUT rJ,$255
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PUT rJ,$255
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LDOU $255,$251,24
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LDOU $255,$251,24
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0:
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0:
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GET $252,rO
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GET $252,rO
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CMPU $252,$252,$255
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CMPU $252,$252,$255
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BNP $252,1f
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BNP $252,1f
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LDOU outret,$251,32
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LDOU outret,$251,32
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POP popval,0
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POP popval,0
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1:
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1:
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LDOU $253,$251,0
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LDOU $253,$251,0
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LDOU $255,$251,8
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LDOU $255,$251,8
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LDOU $254,$251,16
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LDOU $254,$251,16
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GO $255,$255,0
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GO $255,$255,0
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.size longjmp,.-longjmp
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.size longjmp,.-longjmp
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