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/* -----------------------------------------------------------------------
   osf.S - Copyright (c) 1998, 2001 Red Hat
   
   Alpha/OSF Foreign Function Interface 

   $Id: osf.S,v 1.1.1.1 2007/08/18 13:58:58 jeunes2 Exp $

   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>

        .arch ev6
        .text

/* ffi_call_osf (void *args, unsigned long bytes, unsigned flags,
                 void *raddr, void (*fnaddr)());

   Bit o trickiness here -- ARGS+BYTES is the base of the stack frame
   for this function.  This has been allocated by ffi_call.  We also
   deallocate some of the stack that has been alloca'd.  */

        .align  3
        .globl  ffi_call_osf
        .ent    ffi_call_osf
ffi_call_osf:
        .frame  $15, 32, $26, 0
        .mask   0x4008000, -32
$LFB1:
        addq    $16,$17,$1
        mov     $16, $30
        stq     $26, 0($1)
        stq     $15, 8($1)
        stq     $18, 16($1)
        mov     $1, $15
$LCFI1:
        .prologue 0

        stq     $19, 24($1)
        mov     $20, $27

        # Load up all of the (potential) argument registers.
        ldq     $16, 0($30)
        ldt     $f16, 0($30)
        ldt     $f17, 8($30)
        ldq     $17, 8($30)
        ldt     $f18, 16($30)
        ldq     $18, 16($30)
        ldt     $f19, 24($30)
        ldq     $19, 24($30)
        ldt     $f20, 32($30)
        ldq     $20, 32($30)
        ldt     $f21, 40($30)
        ldq     $21, 40($30)

        # Deallocate the register argument area.
        lda     $30, 48($30)

        jsr     $26, ($27), 0
        ldgp    $29, 0($26)

        # If the return value pointer is NULL, assume no return value.
        ldq     $19, 24($15)
        ldq     $18, 16($15)
        ldq     $26, 0($15)
$LCFI2:
        beq     $19, $noretval

        # Store the return value out in the proper type.
        cmpeq   $18, FFI_TYPE_INT, $1
        bne     $1, $retint
        cmpeq   $18, FFI_TYPE_FLOAT, $2
        bne     $2, $retfloat
        cmpeq   $18, FFI_TYPE_DOUBLE, $3
        bne     $3, $retdouble

        .align  3
$noretval:
        ldq     $15, 8($15)
        ret

        .align  4
$retint:
        stq     $0, 0($19)
        nop
        ldq     $15, 8($15)
        ret

        .align  4
$retfloat:
        sts     $f0, 0($19)
        nop
        ldq     $15, 8($15)
        ret

        .align  4
$retdouble:
        stt     $f0, 0($19)
        nop
        ldq     $15, 8($15)
        ret
$LFE1:

        .end    ffi_call_osf

/* ffi_closure_osf(...)

   Receives the closure argument in $1.   */

        .align  3
        .globl  ffi_closure_osf
        .ent    ffi_closure_osf
ffi_closure_osf:
        .frame  $30, 16*8, $26, 0
        .mask   0x4000000, -16*8
$LFB2:
        ldgp    $29, 0($27)
        subq    $30, 16*8, $30
$LCFI5:
        stq     $26, 0($30)
$LCFI6:
        .prologue 1

        # Store all of the potential argument registers in va_list format.
        stt     $f16, 4*8($30)
        stt     $f17, 5*8($30)
        stt     $f18, 6*8($30)
        stt     $f19, 7*8($30)
        stt     $f20, 8*8($30)
        stt     $f21, 9*8($30)
        stq     $16, 10*8($30)
        stq     $17, 11*8($30)
        stq     $18, 12*8($30)
        stq     $19, 13*8($30)
        stq     $20, 14*8($30)
        stq     $21, 15*8($30)

        # Call ffi_closure_osf_inner to do the bulk of the work.
        mov     $1, $16
        lda     $17, 2*8($30)
        lda     $18, 10*8($30)
        jsr     $26, ffi_closure_osf_inner
        ldgp    $29, 0($26)
        ldq     $26, 0($30)

        # Load up the return value in the proper type.
        lda     $1, $load_table
        s4addq  $0, $1, $1
        ldl     $1, 0($1)
        addq    $1, $29, $1
        jmp     $31, ($1), $load_32

        .align 4
$load_none:
        addq    $30, 16*8, $30
        ret

        .align 4
$load_float:
        lds     $f0, 16($30)
        nop
        addq    $30, 16*8, $30
        ret

        .align 4
$load_double:
        ldt     $f0, 16($30)
        nop
        addq    $30, 16*8, $30
        ret

        .align 4
$load_u8:
#ifdef __alpha_bwx__
        ldbu    $0, 16($30)
        nop
#else
        ldq     $0, 16($30)
        and     $0, 255, $0
#endif
        addq    $30, 16*8, $30
        ret

        .align 4
$load_s8:
#ifdef __alpha_bwx__
        ldbu    $0, 16($30)
        sextb   $0, $0
#else
        ldq     $0, 16($30)
        sll     $0, 56, $0
        sra     $0, 56, $0
#endif
        addq    $30, 16*8, $30
        ret

        .align 4
$load_u16:
#ifdef __alpha_bwx__
        ldwu    $0, 16($30)
        nop
#else
        ldq     $0, 16($30)
        zapnot  $0, 3, $0
#endif
        addq    $30, 16*8, $30
        ret

        .align 4
$load_s16:
#ifdef __alpha_bwx__
        ldwu    $0, 16($30)
        sextw   $0, $0
#else
        ldq     $0, 16($30)
        sll     $0, 48, $0
        sra     $0, 48, $0
#endif
        addq    $30, 16*8, $30
        ret

        .align 4
$load_32:
        ldl     $0, 16($30)
        nop
        addq    $30, 16*8, $30
        ret

        .align 4
$load_64:
        ldq     $0, 16($30)
        nop
        addq    $30, 16*8, $30
        ret
$LFE2:

        .end    ffi_closure_osf

#ifdef __ELF__
.section .rodata
#else
.rdata
#endif
$load_table:
        .gprel32 $load_none     # FFI_TYPE_VOID
        .gprel32 $load_32       # FFI_TYPE_INT
        .gprel32 $load_float    # FFI_TYPE_FLOAT
        .gprel32 $load_double   # FFI_TYPE_DOUBLE
        .gprel32 $load_double   # FFI_TYPE_LONGDOUBLE
        .gprel32 $load_u8       # FFI_TYPE_UINT8
        .gprel32 $load_s8       # FFI_TYPE_SINT8
        .gprel32 $load_u16      # FFI_TYPE_UINT16
        .gprel32 $load_s16      # FFI_TYPE_SINT16
        .gprel32 $load_32       # FFI_TYPE_UINT32
        .gprel32 $load_32       # FFI_TYPE_SINT32
        .gprel32 $load_64       # FFI_TYPE_UINT64
        .gprel32 $load_64       # FFI_TYPE_SINT64
        .gprel32 $load_none     # FFI_TYPE_STRUCT
        .gprel32 $load_64       # FFI_TYPE_POINTER

/* Assert that the table above is in sync with ffi.h.  */

#if        FFI_TYPE_FLOAT != 2          \
        || FFI_TYPE_DOUBLE != 3         \
        || FFI_TYPE_UINT8 != 5          \
        || FFI_TYPE_SINT8 != 6          \
        || FFI_TYPE_UINT16 != 7         \
        || FFI_TYPE_SINT16 != 8         \
        || FFI_TYPE_UINT32 != 9         \
        || FFI_TYPE_SINT32 != 10        \
        || FFI_TYPE_UINT64 != 11        \
        || FFI_TYPE_SINT64 != 12        \
        || FFI_TYPE_STRUCT != 13        \
        || FFI_TYPE_POINTER != 14       \
        || FFI_TYPE_LAST != 14
#error "osf.S out of sync with ffi.h"
#endif

#ifdef __ELF__
        .section        .eh_frame,EH_FRAME_FLAGS,@progbits
__FRAME_BEGIN__:
        .4byte  $LECIE1-$LSCIE1 # Length of Common Information Entry
$LSCIE1:
        .4byte  0x0             # CIE Identifier Tag
        .byte   0x1             # CIE Version
        .ascii "zR\0"           # CIE Augmentation
        .byte   0x1             # uleb128 0x1; CIE Code Alignment Factor
        .byte   0x78            # sleb128 -8; CIE Data Alignment Factor
        .byte   26              # CIE RA Column
        .byte   0x1             # uleb128 0x1; Augmentation size
        .byte   0x1b            # FDE Encoding (pcrel sdata4)
        .byte   0xc             # DW_CFA_def_cfa
        .byte   30              # uleb128 column 30
        .byte   0                # uleb128 offset 0
        .align 3
$LECIE1:
$LSFDE1:
        .4byte  $LEFDE1-$LASFDE1                # FDE Length
$LASFDE1:
        .4byte  $LASFDE1-__FRAME_BEGIN__        # FDE CIE offset
        .4byte  $LFB1-.         # FDE initial location
        .4byte  $LFE1-$LFB1     # FDE address range
        .byte   0x0             # uleb128 0x0; Augmentation size

        .byte   0x4             # DW_CFA_advance_loc4
        .4byte  $LCFI1-$LFB1
        .byte   0x9a            # DW_CFA_offset, column 26
        .byte   4               # uleb128 4*-8
        .byte   0x8f            # DW_CFA_offset, column 15
        .byte   0x3             # uleb128 3*-8
        .byte   0xc             # DW_CFA_def_cfa
        .byte   15              # uleb128 column 15
        .byte   32              # uleb128 offset 32

        .byte   0x4             # DW_CFA_advance_loc4
        .4byte  $LCFI2-$LCFI1
        .byte   0xda            # DW_CFA_restore, column 26
        .align 3
$LEFDE1:

$LSFDE3:
        .4byte  $LEFDE3-$LASFDE3                # FDE Length
$LASFDE3:
        .4byte  $LASFDE3-__FRAME_BEGIN__        # FDE CIE offset
        .4byte  $LFB2-.         # FDE initial location
        .4byte  $LFE2-$LFB2     # FDE address range
        .byte   0x0             # uleb128 0x0; Augmentation size

        .byte   0x4             # DW_CFA_advance_loc4
        .4byte  $LCFI5-$LFB2
        .byte   0xe             # DW_CFA_def_cfa_offset
        .byte   0x80,0x1        # uleb128 128

        .byte   0x4             # DW_CFA_advance_loc4
        .4byte  $LCFI6-$LCFI5
        .byte   0x9a            # DW_CFA_offset, column 26
        .byte   16              # uleb128 offset 16*-8
        .align 3
$LEFDE3:
#endif