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/* -----------------------------------------------------------------------
osf.S - Copyright (c) 1998 Cygnus Solutions
Alpha/OSF Foreign Function Interface
$Id: osf.S,v 1.1.1.1 1998/11/29 16:48:16 green Exp $
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
``Software''), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
----------------------------------------------------------------------- */
#define LIBFFI_ASM
#include <ffi.h>
#define callback $16
#define ecifp $17
#define bytes $18
#define flags $19
#define raddr $20
#define fn $21
#define flags_ofs 16
#define raddr_ofs 24
#define fn_ofs 32
#define SIZEOF_FRAME (6*8)
.text
.align 4
.globl ffi_call_osf
.ent ffi_call_osf
ffi_call_osf:
lda $30, -SIZEOF_FRAME($30)
stq $26, 0($30)
stq $15, 8($30)
stq flags, flags_ofs($30)
stq raddr, raddr_ofs($30)
stq fn, fn_ofs($30)
mov $30, $15
.frame $15, SIZEOF_FRAME, $26, 0
.mask 0x4008000, -SIZEOF_FRAME
.prologue 0
mov callback, $27 # mov callback into place
subq $30, bytes, $30 # allocate stack space
# Call ffi_prep_args; ecif, bytes and flags are already in place.
mov $30, $16 # push stack arg
jsr $26, ($27), 0
# Load up all of the (potential) argument registers.
ldt $f16, 0($30)
ldt $f17, 8($30)
ldt $f18, 16($30)
ldt $f19, 24($30)
ldt $f20, 32($30)
ldt $f21, 40($30)
ldq $16, 48($30)
ldq $17, 56($30)
ldq $18, 64($30)
ldq $19, 72($30)
ldq $20, 80($30)
ldq $21, 88($30)
# Get rid of the arg reg temp space and call the function.
ldq $27, fn_ofs($15)
lda $30, 12*8($30)
jsr $26, ($27), 0
# If the return value pointer is NULL, assume no return value.
ldq raddr, raddr_ofs($15)
beq raddr, $noretval
ldq flags, flags_ofs($15)
cmpeq flags, FFI_TYPE_INT, $1
bne $1, $retint
cmpeq flags, FFI_TYPE_FLOAT, $2
bne $2, $retfloat
cmpeq flags, FFI_TYPE_DOUBLE, $3
bne $3, $retdouble
br $retstruct
.align 3
$retint:
stq $0, 0(raddr)
br $noretval
$retfloat:
sts $f0, 0(raddr)
br $noretval
$retdouble:
stt $f0, 0(raddr)
$retstruct:
$noretval:
mov $15, $30
ldq $26, 0($15)
ldq $15, 8($15)
lda $30, SIZEOF_FRAME($30)
ret
.end ffi_call_osf
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