github.com/llvm-mirror/llgo@v0.0.0-20190322182713-bf6f0a60fce1/third_party/gofrontend/libffi/src/moxie/eabi.S (about)

     1  /* -----------------------------------------------------------------------
     2     eabi.S - Copyright (c) 2012, 2013  Anthony Green
     3     
     4     Moxie Assembly glue.
     5  
     6     Permission is hereby granted, free of charge, to any person obtaining
     7     a copy of this software and associated documentation files (the
     8     ``Software''), to deal in the Software without restriction, including
     9     without limitation the rights to use, copy, modify, merge, publish,
    10     distribute, sublicense, and/or sell copies of the Software, and to
    11     permit persons to whom the Software is furnished to do so, subject to
    12     the following conditions:
    13  
    14     The above copyright notice and this permission notice shall be included
    15     in all copies or substantial portions of the Software.
    16  
    17     THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
    18     OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    19     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    20     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
    21     OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
    22     ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    23     OTHER DEALINGS IN THE SOFTWARE.
    24     ----------------------------------------------------------------------- */
    25  
    26  #define LIBFFI_ASM	
    27  #include <fficonfig.h>
    28  #include <ffi.h>
    29  
    30  	.globl ffi_prep_args_EABI
    31  
    32  	.text
    33  	.p2align 4
    34  	.globl ffi_call_EABI
    35  	.type ffi_call_EABI, @function
    36  
    37  	# $r0 :   ffi_prep_args
    38  	# $r1 :   &ecif
    39  	# $r2 :   cif->bytes
    40  	# $r3 :   fig->flags
    41  	# $r4 :   ecif.rvalue
    42  	# $r5 :   fn
    43  	
    44  ffi_call_EABI:
    45  	push	$sp, $r6
    46  	push	$sp, $r7
    47  	push	$sp, $r8
    48  	dec	$sp, 24
    49  
    50  	/* Store incoming args on stack.  */
    51  	sto.l	0($sp), $r0 /* ffi_prep_args */
    52  	sto.l	4($sp), $r1 /* ecif */
    53  	sto.l	8($sp), $r2 /* bytes */
    54  	sto.l	12($sp), $r3 /* flags */
    55  	sto.l	16($sp), $r4 /* &rvalue */
    56  	sto.l	20($sp), $r5 /* fn */
    57  	
    58  	/* Call ffi_prep_args.  */
    59  	mov 	$r6, $r4 /* Save result buffer */
    60  	mov	$r7, $r5 /* Save the target fn */
    61  	mov	$r8, $r3 /* Save the flags */
    62  	sub.l	$sp, $r2 /* Allocate stack space */
    63  	mov	$r0, $sp /* We can stomp over $r0 */
    64  	/* $r1 is already set up */
    65  	jsra 	ffi_prep_args
    66  
    67  	/* Load register arguments.  */
    68  	ldo.l	$r0, 0($sp)
    69  	ldo.l	$r1, 4($sp)
    70  	ldo.l	$r2, 8($sp)
    71  	ldo.l	$r3, 12($sp)
    72  	ldo.l	$r4, 16($sp)
    73  	ldo.l	$r5, 20($sp)
    74  	
    75  	/* Call the target function.  */
    76  	jsr	$r7
    77  
    78  	ldi.l	$r7, 0xffffffff
    79  	cmp	$r8, $r7
    80  	beq	retstruct
    81  
    82  	ldi.l	$r7, 4
    83  	cmp	$r8, $r7
    84  	bgt	ret2reg
    85  
    86  	st.l	($r6), $r0
    87  	jmpa	retdone
    88  
    89  ret2reg:	
    90  	st.l	($r6), $r0
    91  	sto.l	4($r6), $r1
    92  
    93  retstruct:
    94  retdone:	
    95  	/* Return.  */
    96  	ldo.l	$r6, -4($fp)
    97  	ldo.l	$r7, -8($fp)
    98  	ldo.l	$r8, -12($fp)
    99  	ret
   100  	.size ffi_call_EABI, .-ffi_call_EABI
   101