! sssos8.s: STACK SCANNING
!
! $Id: //info.ravenbrook.com/project/mps/version/1.103/code/sssos8.s#1 $
!
! Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
!
! This scans the stack and the preserved integer registers.
! See <design/thread-manager/>.
!
! This file is identical to <code/sssus8.s>, except for the
! leading underscore convention on C names. They should be
! changed in parallel.
!
! The non-global registers are preserved into the stackframe
! by the "ta 3" instruction. This leaves the global registers.
! According to the Sparc Architecture Manual:
! %g1 is assumed to be volatile across procedure calls
! %g2...%g4 are "reserved for use by application programmer"
! %g5...%g7 are "nonvolatile and reserved for (as-yet-undefined)
! use by the execution environment"
! To be safe %g2 to %g7 are pushed onto the stack before scanning
! it just in case.
.text
.align 4
.global StackScan
StackScan: !(ss, stackBot)
save %sp,-120,%sp !23 required + 6 globals = 29 words, 8-aligned
std %g6,[%fp-8] !double stores
std %g4,[%fp-16]
std %g2,[%fp-24]
ta 3 !flushes register windows onto stack
mov %i0,%o0 !ss
sub %fp,24,%o1 !stackTop (base)
call TraceScanArea !(stackTop,stackBot,trace,rank) returns e
mov %i1,%o2 !ds!stackBot (limit)
ret
restore %g0,%o0,%o0 !ds!return e
! C. COPYRIGHT AND LICENSE
!
! Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
! All rights reserved. This is an open source license. Contact
! Ravenbrook for commercial licensing options.
!
! Redistribution and use in source and binary forms, with or without
! modification, are permitted provided that the following conditions are
! met:
!
! 1. Redistributions of source code must retain the above copyright
! notice, this list of conditions and the following disclaimer.
!
! 2. Redistributions in binary form must reproduce the above copyright
! notice, this list of conditions and the following disclaimer in the
! documentation and/or other materials provided with the distribution.
!
! 3. Redistributions in any form must be accompanied by information on how
! to obtain complete source code for this software and any accompanying
! software that uses this software. The source code must either be
! included in the distribution or be available for no more than the cost
! of distribution plus a nominal fee, and must be freely redistributable
! under reasonable conditions. For an executable file, complete source
! code means the source code for all modules it contains. It does not
! include source code for modules or files that typically accompany the
! major components of the operating system on which the executable file
! runs.
!
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
! IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
! PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
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