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/* -----------------------------------------------------------------------
sysv.S - Copyright (c) 1998 Cygnus Solutions
ARM Foreign Function Interface
$Id: sysv.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>
#ifdef HAVE_MACHINE_ASM_H
#include <machine/asm.h>
#else
/* XXX these lose for some platforms, I'm sure. */
#define CNAME(x) x
#define ENTRY(x) .globl CNAME(x); .type CNAME(x),%function; CNAME(x):
#endif
.text
# a1: ffi_prep_args
# a2: &ecif
# a3: cif->bytes
# a4: fig->flags
# sp+0: ecif.rvalue
# sp+4: fn
# This assumes we are using gas.
ENTRY(ffi_call_SYSV)
# Save registers
stmfd sp!, {a1-a4, fp, lr}
mov fp, sp
# Make room for all of the new args.
sub sp, fp, a3
# Place all of the ffi_prep_args in position
mov ip, a1
mov a1, sp
# a2 already set
# And call
mov lr, pc
mov pc, ip
# move first 4 parameters in registers
ldr a1, [sp, #0]
ldr a2, [sp, #4]
ldr a3, [sp, #8]
ldr a4, [sp, #12]
# and adjust stack
ldr ip, [fp, #8]
cmp ip, #16
movge ip, #16
add sp, sp, ip
# call function
mov lr, pc
ldr pc, [fp, #28]
# Remove the space we pushed for the args
mov sp, fp
# Load a3 with the pointer to storage for the return value
ldr a3, [sp, #24]
# Load a4 with the return type code
ldr a4, [sp, #12]
# If the return value pointer is NULL, assume no return value.
cmp a3, #0
beq epilogue
# return INT
cmp a4, #FFI_TYPE_INT
streq a1, [a3]
beq epilogue
# return FLOAT
cmp a4, #FFI_TYPE_FLOAT
bne retdouble
stfs f0, [a3]
b epilogue
# return DOUBLE or LONGDOUBLE
retdouble:
cmp a4, #FFI_TYPE_DOUBLE
bne epilogue
stfs f0, [a3, #0]
stfs f1, [a3, #4]
b epilogue
epilogue:
ldmfd sp!, {a1-a4, fp, pc}
.ffi_call_SYSV_end:
.size CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)
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