xref: /external/libffi/src/powerpc/darwin.S

/* -----------------------------------------------------------------------
   darwin.S - Copyright (c) 2000 John Hornkvist
	      Copyright (c) 2004 Free Software Foundation, Inc.

   PowerPC Assembly glue.

   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 THE AUTHOR 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.
   ----------------------------------------------------------------------- */

#if defined(__ppc64__)
#define MODE_CHOICE(x, y) y
#else
#define MODE_CHOICE(x, y) x
#endif

#define g_long  MODE_CHOICE(long, quad)         /* usage is ".g_long" */

#define LOG2_GPR_BYTES  MODE_CHOICE(2,3)        /* log2(GPR_BYTES) */

#define LIBFFI_ASM
#include <fficonfig.h>
#include <ffi.h>
#define JUMPTARGET(name) name
#define L(x) x
.text
	.align 2
.globl _ffi_prep_args

.text
	.align 2
.globl _ffi_call_DARWIN
.text
	.align 2
_ffi_call_DARWIN:
LFB0:
	mr   	r12,r8	/* We only need r12 until the call,
			   so it doesn't have to be saved.  */
LFB1:
	/* Save the old stack pointer as AP.  */
	mr	r8,r1
LCFI0:
	/* Allocate the stack space we need.  */
	stwux	r1,r1,r4

	/* Save registers we use.  */
	mflr	r9

	stw	r28,-16(r8)
	stw	r29,-12(r8)
	stw	r30,-8(r8)
	stw	r31,-4(r8)

	stw	r9,8(r8)
	stw	r2,20(r1)
LCFI1:

	/* Save arguments over call.  */
	mr	r31,r5	/* flags,  */
	mr	r30,r6	/* rvalue,  */
	mr	r29,r7	/* function address,  */
	mr	r28,r8	/* our AP.  */
LCFI2:
	/* Call ffi_prep_args.  */
	mr	r4,r1
// ANDROID: these changes were necessary in 2.x; not yet tested in 3.x
//	subi    r1,r1,32 /* Android: adjust stack for parameter / scratch area */
	li	r9,0

	mtctr	r12 /* r12 holds address of _ffi_prep_args.  */
	bctrl
//	addi    r1,r1,32 /* Android: readjust stack (see subi above) */
	lwz     r2,20(r1)

	/* Now do the call.
	   Set up cr1 with bits 4-7 of the flags.  */
	mtcrf	0x40,r31
	/* Get the address to call into CTR.  */
	mtctr	r29
	/* Load all those argument registers.
	   We have set up a nice stack frame, just load it into registers.  */
	lwz     r3,20+(1*4)(r1)
	lwz     r4,20+(2*4)(r1)
	lwz     r5,20+(3*4)(r1)
	lwz     r6,20+(4*4)(r1)
	nop
	lwz     r7,20+(5*4)(r1)
	lwz     r8,20+(6*4)(r1)
	lwz     r9,20+(7*4)(r1)
	lwz     r10,20+(8*4)(r1)

L1:
	/* Load all the FP registers.  */
	bf	6,L2	/* No floats to load.  */
	lfd	f1,-16-(13*8)(r28)
	lfd	f2,-16-(12*8)(r28)
	lfd	f3,-16-(11*8)(r28)
	lfd	f4,-16-(10*8)(r28)
	nop
	lfd	f5,-16-(9*8)(r28)
	lfd	f6,-16-(8*8)(r28)
	lfd	f7,-16-(7*8)(r28)
	lfd	f8,-16-(6*8)(r28)
	nop
	lfd     f9,-16-(5*8)(r28)
	lfd     f10,-16-(4*8)(r28)
	lfd     f11,-16-(3*8)(r28)
	lfd     f12,-16-(2*8)(r28)
	nop
	lfd     f13,-16-(1*8)(r28)

L2:
	mr	r12,r29	/* Put the target address in r12 as specified.  */
	mtctr  	r12
	nop
	nop
	/* Make the call.  */
	bctrl

	/* Now, deal with the return value.  */
	mtcrf	0x01,r31

	bt	30,L(done_return_value)
	bt	29,L(fp_return_value)
	stw	r3,0(r30)
	bf	28,L(done_return_value)
	stw	r4,4(r30)

	/* Fall through.  */

L(done_return_value):
	/* Restore the registers we used and return.  */
	lwz	r9,8(r28)
	lwz	r31,-4(r28)
	mtlr	r9
	lwz	r30,-8(r28)
	lwz	r29,-12(r28)
	lwz	r28,-16(r28)
	lwz	r1,0(r1)
	blr

L(fp_return_value):
	/* Do we have long double to store?  */
	bf	31,L(fd_return_value)
	stfd	f1,0(r30)
	stfd	f2,8(r30)
	b	L(done_return_value)

L(fd_return_value):
	/* Do we have double to store?  */
	bf	28,L(float_return_value)
	stfd	f1,0(r30)
	b	L(done_return_value)

L(float_return_value):
	/* We only have a float to store.  */
	stfs	f1,0(r30)
	b	L(done_return_value)

LFE1:
/* END(_ffi_call_DARWIN)  */

/* Provide a null definition of _ffi_call_AIX.  */
.text
	.align 2
.globl _ffi_call_AIX
.text
	.align 2
_ffi_call_AIX:
	blr
/* END(_ffi_call_AIX)  */

.data
.section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms
EH_frame1:
	.set	L$set$0,LECIE1-LSCIE1
	.long	L$set$0	; Length of Common Information Entry
LSCIE1:
	.long	0x0	; CIE Identifier Tag
	.byte	0x1	; CIE Version
	.ascii	"zR\0"	; CIE Augmentation
	.byte	0x1	; uleb128 0x1; CIE Code Alignment Factor
	.byte	0x7c	; sleb128 -4; CIE Data Alignment Factor
	.byte	0x41	; CIE RA Column
	.byte	0x1	; uleb128 0x1; Augmentation size
	.byte	0x90	; FDE Encoding (indirect pcrel)
	.byte	0xc	; DW_CFA_def_cfa
	.byte	0x1	; uleb128 0x1
	.byte	0x0	; uleb128 0x0
	.align	LOG2_GPR_BYTES
LECIE1:
.globl _ffi_call_DARWIN.eh
_ffi_call_DARWIN.eh:
LSFDE1:
	.set	L$set$1,LEFDE1-LASFDE1
	.long	L$set$1	; FDE Length
LASFDE1:
	.long	LASFDE1-EH_frame1 ; FDE CIE offset
	.g_long	LLFB0$non_lazy_ptr-.	; FDE initial location
	.set	L$set$3,LFE1-LFB0
	.g_long	L$set$3	; FDE address range
	.byte   0x0     ; uleb128 0x0; Augmentation size
	.byte	0x4	; DW_CFA_advance_loc4
	.set	L$set$4,LCFI0-LFB1
	.long	L$set$4
	.byte	0xd	; DW_CFA_def_cfa_register
	.byte	0x08	; uleb128 0x08
	.byte	0x4	; DW_CFA_advance_loc4
	.set	L$set$5,LCFI1-LCFI0
	.long	L$set$5
	.byte   0x11    ; DW_CFA_offset_extended_sf
	.byte	0x41	; uleb128 0x41
	.byte   0x7e    ; sleb128 -2
	.byte	0x9f	; DW_CFA_offset, column 0x1f
	.byte	0x1	; uleb128 0x1
	.byte	0x9e	; DW_CFA_offset, column 0x1e
	.byte	0x2	; uleb128 0x2
	.byte	0x9d	; DW_CFA_offset, column 0x1d
	.byte	0x3	; uleb128 0x3
	.byte	0x9c	; DW_CFA_offset, column 0x1c
	.byte	0x4	; uleb128 0x4
	.byte	0x4	; DW_CFA_advance_loc4
	.set	L$set$6,LCFI2-LCFI1
	.long	L$set$6
	.byte	0xd	; DW_CFA_def_cfa_register
	.byte	0x1c	; uleb128 0x1c
	.align LOG2_GPR_BYTES
LEFDE1:
.data
	.align LOG2_GPR_BYTES
LLFB0$non_lazy_ptr:
	.g_long LFB0