diff options
Diffstat (limited to 'scaf/pdp')
| -rw-r--r-- | scaf/pdp/scaf_feeder.s | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/scaf/pdp/scaf_feeder.s b/scaf/pdp/scaf_feeder.s new file mode 100644 index 0000000..e7ef3c6 --- /dev/null +++ b/scaf/pdp/scaf_feeder.s @@ -0,0 +1,50 @@ +# Pure Data Packet - scaf feeder routine. +# Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org> +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +# + +# for dup +.include "../compiler/scafmacro.s" + + +# *rg is only used for returning the stack pointer +# the 4 bit counter is using registers mm4-mm7 now +# long long scaf_feeder(void *tos, void *rg, *void() ca_rule, void *env) +.globl scaf_feeder +.type scaf_feeder, @function +scaf_feeder: + pushl %ebp + movl %esp, %ebp + push %esi + push %edi + + movl 20(%ebp), %edi # load env ptr + movl 8(%ebp), %esi # load TOS2 ptr + movl 16(%ebp), %eax # address of ca routine + pcmpeqw %mm3, %mm3 # load 1 reg + + call *%eax # TOS = 32x2 cell result + dup # push %mm0 to memory + movl (%esi), %eax + movl 4(%esi), %edx + lea 16(%esi), %esi # discard stack + movl %esi, (%edi) # store for stack underflow check + + emms + pop %edi + pop %esi + leave + ret |