-----------------------------------------------------------------------
sysv.h - Copyright (c) 2003 Jakub Jelinek <jakub@redhat.com>
         Copyright (c) 2008 Red Hat, Inc.

PowerPC64 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 AUTHORS OR COPYRIGHT
HOLDERS 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>

.file   "linux64_closure.S"

ifdef powerpc64

FFI_HIDDEN (ffi_closure_LINUX64)
FFI_HIDDEN (.ffi_closure_LINUX64)
.globl  ffi_closure_LINUX64, .ffi_closure_LINUX64
.section        ".opd","aw"
.align  3

ffi_closure_LINUX64:

.quad   .ffi_closure_LINUX64,.TOC.@tocbase,0
.size   ffi_closure_LINUX64,24
.type   .ffi_closure_LINUX64,@function
.text

.ffi_closure_LINUX64: .LFB1:

# save general regs into parm save area
std     %r3, 48(%r1)
std     %r4, 56(%r1)
std     %r5, 64(%r1)
std     %r6, 72(%r1)
mflr    %r0

std     %r7, 80(%r1)
std     %r8, 88(%r1)
std     %r9, 96(%r1)
std     %r10, 104(%r1)
std     %r0, 16(%r1)

# mandatory 48 bytes special reg save area + 64 bytes parm save area
# + 16 bytes retval area + 13*8 bytes fpr save area + round to 16
stdu    %r1, -240(%r1)

.LCFI0:

# next save fpr 1 to fpr 13
stfd  %f1, 128+(0*8)(%r1)
stfd  %f2, 128+(1*8)(%r1)
stfd  %f3, 128+(2*8)(%r1)
stfd  %f4, 128+(3*8)(%r1)
stfd  %f5, 128+(4*8)(%r1)
stfd  %f6, 128+(5*8)(%r1)
stfd  %f7, 128+(6*8)(%r1)
stfd  %f8, 128+(7*8)(%r1)
stfd  %f9, 128+(8*8)(%r1)
stfd  %f10, 128+(9*8)(%r1)
stfd  %f11, 128+(10*8)(%r1)
stfd  %f12, 128+(11*8)(%r1)
stfd  %f13, 128+(12*8)(%r1)

# set up registers for the routine that actually does the work
# get the context pointer from the trampoline
mr %r3, %r11

# now load up the pointer to the result storage
addi %r4, %r1, 112

# now load up the pointer to the parameter save area
# in the previous frame
addi %r5, %r1, 240 + 48

# now load up the pointer to the saved fpr registers */
addi %r6, %r1, 128

# make the call
bl .ffi_closure_helper_LINUX64

.Lret:

# now r3 contains the return type
# so use it to look up in a table
# so we know how to deal with each type

# look up the proper starting point in table
# by using return type as offset
mflr %r4                # move address of .Lret to r4
sldi %r3, %r3, 4        # now multiply return type by 16
addi %r4, %r4, .Lret_type0 - .Lret
ld %r0, 240+16(%r1)
add %r3, %r3, %r4       # add contents of table to table address
mtctr %r3
bctr                    # jump to it

# Each of the ret_typeX code fragments has to be exactly 16 bytes long # (4 instructions). For cache effectiveness we align to a 16 byte boundary # first.

.align 4

.Lret_type0: # case FFI_TYPE_VOID

mtlr %r0
addi %r1, %r1, 240
blr
nop

# case FFI_TYPE_INT

lwa %r3, 112+4(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# case FFI_TYPE_FLOAT

lfs %f1, 112+0(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# case FFI_TYPE_DOUBLE

lfd %f1, 112+0(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# case FFI_TYPE_LONGDOUBLE

lfd %f1, 112+0(%r1)
mtlr %r0
lfd %f2, 112+8(%r1)
b .Lfinish

# case FFI_TYPE_UINT8

lbz %r3, 112+7(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# case FFI_TYPE_SINT8

lbz %r3, 112+7(%r1)
extsb %r3,%r3
mtlr %r0
b .Lfinish

# case FFI_TYPE_UINT16

lhz %r3, 112+6(%r1)
mtlr %r0

.Lfinish:

addi %r1, %r1, 240
blr

# case FFI_TYPE_SINT16

lha %r3, 112+6(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# case FFI_TYPE_UINT32

lwz %r3, 112+4(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# case FFI_TYPE_SINT32

lwa %r3, 112+4(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# case FFI_TYPE_UINT64

ld %r3, 112+0(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# case FFI_TYPE_SINT64

ld %r3, 112+0(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# case FFI_TYPE_STRUCT

mtlr %r0
addi %r1, %r1, 240
blr
nop

# case FFI_TYPE_POINTER

ld %r3, 112+0(%r1)
mtlr %r0
addi %r1, %r1, 240
blr

# esac .LFE1:

.long   0
.byte   0,12,0,1,128,0,0,0
.size   .ffi_closure_LINUX64,.-.ffi_closure_LINUX64

.section        .eh_frame,EH_FRAME_FLAGS,@progbits

.Lframe1:

.4byte  .LECIE1-.LSCIE1  # Length of Common Information Entry

.LSCIE1:

.4byte  0x0      # CIE Identifier Tag
.byte   0x1      # CIE Version
.ascii "zR\0"    # CIE Augmentation
.uleb128 0x1     # CIE Code Alignment Factor
.sleb128 -8      # CIE Data Alignment Factor
.byte   0x41     # CIE RA Column
.uleb128 0x1     # Augmentation size
.byte   0x14     # FDE Encoding (pcrel udata8)
.byte   0xc      # DW_CFA_def_cfa
.uleb128 0x1
.uleb128 0x0
.align 3

.LECIE1: .LSFDE1:

.4byte  .LEFDE1-.LASFDE1         # FDE Length

.LASFDE1:

.4byte  .LASFDE1-.Lframe1        # FDE CIE offset
.8byte  .LFB1-.  # FDE initial location
.8byte  .LFE1-.LFB1      # FDE address range
.uleb128 0x0     # Augmentation size
.byte   0x2      # DW_CFA_advance_loc1
.byte   .LCFI0-.LFB1
.byte   0xe      # DW_CFA_def_cfa_offset
.uleb128 240
.byte   0x11     # DW_CFA_offset_extended_sf
.uleb128 0x41
.sleb128 -2
.align 3

.LEFDE1: endif

if defined __ELF__ && defined __linux__

.section        .note.GNU-stack,"",@progbits

endif