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/Modules/_ctypes/libffi/src/frv/eabi.S

http://unladen-swallow.googlecode.com/
Assembly | 128 lines | 106 code | 22 blank | 0 comment | 2 complexity | b9ecce87980cf9448d35f168d0b12575 MD5 | raw file
  1/* -----------------------------------------------------------------------
  2   eabi.S - Copyright (c) 2004  Anthony Green
  3   
  4   FR-V 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	# gr8 :   ffi_prep_args
 38	# gr9 :   &ecif
 39	# gr10:   cif->bytes
 40	# gr11:   fig->flags
 41	# gr12:   ecif.rvalue
 42	# gr13:   fn
 43	
 44ffi_call_EABI:	
 45	addi	sp, #-80, sp
 46	sti	fp, @(sp, #24)
 47	addi	sp, #24, fp
 48	movsg	lr, gr5
 49
 50	/* Make room for the new arguments.  */
 51	/* subi	sp, fp, gr10 */
 52	
 53	/* Store return address and incoming args on stack.  */
 54	sti	gr5, @(fp, #8)
 55	sti	gr8, @(fp, #-4)
 56	sti	gr9, @(fp, #-8)
 57	sti	gr10, @(fp, #-12)
 58	sti	gr11, @(fp, #-16)
 59	sti	gr12, @(fp, #-20)
 60	sti	gr13, @(fp, #-24)
 61
 62	sub     sp, gr10, sp
 63	
 64	/* Call ffi_prep_args.  */
 65	ldi	@(fp, #-4), gr4
 66	addi	sp, #0, gr8
 67	ldi	@(fp, #-8), gr9
 68#ifdef __FRV_FDPIC__
 69	ldd	@(gr4, gr0), gr14
 70	calll	@(gr14, gr0)
 71#else
 72	calll	@(gr4, gr0)
 73#endif	
 74
 75	/* ffi_prep_args returns the new stack pointer.  */
 76	mov	gr8, gr4
 77		
 78	ldi	@(sp, #0), gr8
 79	ldi	@(sp, #4), gr9
 80	ldi	@(sp, #8), gr10
 81	ldi	@(sp, #12), gr11
 82	ldi	@(sp, #16), gr12
 83	ldi	@(sp, #20), gr13
 84
 85	/* Always copy the return value pointer into the hidden
 86	   parameter register.  This is only strictly necessary
 87	   when we're returning an aggregate type, but it doesn't
 88	   hurt to do this all the time, and it saves a branch.  */
 89	ldi	@(fp, #-20), gr3
 90
 91	/* Use the ffi_prep_args return value for the new sp.  */
 92	mov	gr4, sp
 93	
 94	/* Call the target function.  */
 95	ldi	@(fp, -24), gr4
 96#ifdef __FRV_FDPIC__
 97	ldd	@(gr4, gr0), gr14
 98	calll	@(gr14, gr0)
 99#else
100	calll	@(gr4, gr0)
101#endif	
102
103	/* Store the result. */
104	ldi	@(fp, #-16), gr10  /* fig->flags */
105	ldi	@(fp, #-20), gr4   /* ecif.rvalue */
106
107	/* Is the return value stored in two registers?  */
108	cmpi	gr10, #8, icc0
109	bne	icc0, 0, .L2
110	/*   Yes, save them.  */
111	sti	gr8, @(gr4, #0)
112	sti	gr9, @(gr4, #4)
113	bra	.L3
114.L2:
115	/* Is the return value a structure?  */
116	cmpi	gr10, #-1, icc0
117	beq	icc0, 0, .L3
118	/*   No, save a 4 byte return value.  */
119	sti	gr8, @(gr4, #0)
120.L3:	
121
122	/* Restore the stack, and return.  */
123	ldi	@(fp, 8), gr5
124	ld	@(fp, gr0), fp
125	addi	sp,#80,sp
126	jmpl	@(gr5,gr0)
127	.size ffi_call_EABI, .-ffi_call_EABI
128