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/* -----------------------------------------------------------------------
o32.S - Copyright (c) 1996, 1998 Red Hat, Inc.
MIPS Foreign Function Interface
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 <fficonfig.h>
#include <ffi.h>
/* Only build this code if we are compiling for o32 */
#if defined(FFI_MIPS_O32)
#define callback a0
#define bytes a2
#define flags a3
#define SIZEOF_FRAME ( 4 * FFI_SIZEOF_ARG + 2 * FFI_SIZEOF_ARG )
.text
.align 2
.globl ffi_call_O32
.ent ffi_call_O32
ffi_call_O32:
# Prologue
SUBU $sp, SIZEOF_FRAME # Frame size
REG_S $fp, SIZEOF_FRAME - 2*FFI_SIZEOF_ARG($sp) # Save frame pointer
REG_S ra, SIZEOF_FRAME - 1*FFI_SIZEOF_ARG($sp) # Save return address
move $fp, $sp
move t9, callback # callback function pointer
REG_S flags, SIZEOF_FRAME + 3*FFI_SIZEOF_ARG($fp) # flags
# Allocate at least 4 words in the argstack
move v0, bytes
bge bytes, 4 * FFI_SIZEOF_ARG, bigger
LI v0, 4 * FFI_SIZEOF_ARG
b sixteen
bigger:
ADDU t0, v0, 2 * FFI_SIZEOF_ARG -1 # make sure it is aligned
and v0, t0, -2 * FFI_SIZEOF_ARG # to an 8 byte boundry
sixteen:
SUBU $sp, $sp, v0 # move the stack pointer to reflect the
# arg space
ADDU a0, $sp, 4 * FFI_SIZEOF_ARG
ADDU a3, $fp, SIZEOF_FRAME + 3*FFI_SIZEOF_ARG
jal t9
REG_L t0, SIZEOF_FRAME + 3*FFI_SIZEOF_ARG($fp) # load the flags word
add t2, t0, 0 # and copy it into t2
and t0, ((1<<4)-1) # mask out the return type
SRL t2, 4 # shift our arg info
ADDU $sp, $sp, 4 * FFI_SIZEOF_ARG # adjust $sp to new args
bnez t0, pass_d # make it quick for int
REG_L a0, 0*FFI_SIZEOF_ARG($sp) # just go ahead and load the
REG_L a1, 1*FFI_SIZEOF_ARG($sp) # four regs.
REG_L a2, 2*FFI_SIZEOF_ARG($sp)
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_d:
bne t0, FFI_ARGS_D, pass_f
l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
REG_L a2, 2*FFI_SIZEOF_ARG($sp) # passing a double
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_f:
bne t0, FFI_ARGS_F, pass_d_d
l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
REG_L a1, 1*FFI_SIZEOF_ARG($sp) # passing a float
REG_L a2, 2*FFI_SIZEOF_ARG($sp)
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_d_d:
bne t0, FFI_ARGS_DD, pass_f_f
l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
l.d $f14, 2*FFI_SIZEOF_ARG($sp) # passing two doubles
b call_it
pass_f_f:
bne t0, FFI_ARGS_FF, pass_d_f
l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
l.s $f14, 1*FFI_SIZEOF_ARG($sp) # passing two floats
REG_L a2, 2*FFI_SIZEOF_ARG($sp)
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_d_f:
bne t0, FFI_ARGS_DF, pass_f_d
l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
l.s $f14, 2*FFI_SIZEOF_ARG($sp) # passing double and float
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_f_d:
# assume that the only other combination must be float then double
# bne t0, FFI_ARGS_F_D, call_it
l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
l.d $f14, 2*FFI_SIZEOF_ARG($sp) # passing double and float
call_it:
# Load the function pointer
REG_L t9, SIZEOF_FRAME + 5*FFI_SIZEOF_ARG($fp)
# If the return value pointer is NULL, assume no return value.
REG_L t1, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
beqz t1, noretval
bne t2, FFI_TYPE_INT, retfloat
jal t9
REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
REG_S v0, 0(t0)
b epilogue
retfloat:
bne t2, FFI_TYPE_FLOAT, retdouble
jal t9
REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
s.s $f0, 0(t0)
b epilogue
retdouble:
bne t2, FFI_TYPE_DOUBLE, noretval
jal t9
REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
s.d $f0, 0(t0)
b epilogue
noretval:
jal t9
# Epilogue
epilogue:
move $sp, $fp
REG_L $fp, SIZEOF_FRAME - 2*FFI_SIZEOF_ARG($sp) # Restore frame pointer
REG_L ra, SIZEOF_FRAME - 1*FFI_SIZEOF_ARG($sp) # Restore return address
ADDU $sp, SIZEOF_FRAME # Fix stack pointer
j ra
.end ffi_call_O32
#endif
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