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/* -----------------------------------------------------------------------
   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
        li      r9,0

        mtctr   r12 /* r12 holds address of _ffi_prep_args.  */
        bctrl
        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