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

.file   "ppc_closure.S"

ifndef powerpc64

ENTRY(ffi_closure_SYSV) .LFB1:

stwu %r1,-144(%r1)

.LCFI0:

mflr %r0

.LCFI1:

stw %r0,148(%r1)

# we want to build up an areas for the parameters passed # in registers (both floating point and integer)

# so first save gpr 3 to gpr 10 (aligned to 4)
stw   %r3, 16(%r1)
stw   %r4, 20(%r1)
stw   %r5, 24(%r1)
stw   %r6, 28(%r1)
stw   %r7, 32(%r1)
stw   %r8, 36(%r1)
stw   %r9, 40(%r1)
stw   %r10,44(%r1)

ifndef NO_FPRS

# next save fpr 1 to fpr 8 (aligned to 8)
stfd  %f1, 48(%r1)
stfd  %f2, 56(%r1)
stfd  %f3, 64(%r1)
stfd  %f4, 72(%r1)
stfd  %f5, 80(%r1)
stfd  %f6, 88(%r1)
stfd  %f7, 96(%r1)
stfd  %f8, 104(%r1)

endif

# 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 saved gpr registers
addi %r5,%r1,16

# now load up the pointer to the saved fpr registers */
addi %r6,%r1,48

# now load up the pointer to the outgoing parameter
# stack in the previous frame
# i.e. the previous frame pointer + 8
addi %r7,%r1,152

# make the call
bl ffi_closure_helper_SYSV@local

.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
slwi %r3,%r3,4          # now multiply return type by 16
addi %r4, %r4, .Lret_type0 - .Lret
lwz %r0,148(%r1)
add %r3,%r3,%r4         # add contents of table to table address
mtctr %r3
bctr                    # jump to it

.LFE1:

# 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

# case FFI_TYPE_VOID .Lret_type0:

mtlr %r0
addi %r1,%r1,144
blr
nop

# case FFI_TYPE_INT

lwz %r3,112+0(%r1)
mtlr %r0

.Lfinish:

addi %r1,%r1,144
blr

# case FFI_TYPE_FLOAT

lfs %f1,112+0(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_TYPE_DOUBLE

lfd %f1,112+0(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_TYPE_LONGDOUBLE

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

# case FFI_TYPE_UINT8

lbz %r3,112+3(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_TYPE_SINT8

lbz %r3,112+3(%r1)
extsb %r3,%r3
mtlr %r0
b .Lfinish

# case FFI_TYPE_UINT16

lhz %r3,112+2(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_TYPE_SINT16

lha %r3,112+2(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_TYPE_UINT32

lwz %r3,112+0(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_TYPE_SINT32

lwz %r3,112+0(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_TYPE_UINT64

lwz %r3,112+0(%r1)
lwz %r4,112+4(%r1)
mtlr %r0
b .Lfinish

# case FFI_TYPE_SINT64

lwz %r3,112+0(%r1)
lwz %r4,112+4(%r1)
mtlr %r0
b .Lfinish

# case FFI_TYPE_STRUCT

mtlr %r0
addi %r1,%r1,144
blr
nop

# case FFI_TYPE_POINTER

lwz %r3,112+0(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_TYPE_UINT128

lwz %r3,112+0(%r1)
lwz %r4,112+4(%r1)
lwz %r5,112+8(%r1)
bl .Luint128

# The return types below are only used when the ABI type is FFI_SYSV. # case FFI_SYSV_TYPE_SMALL_STRUCT + 1. One byte struct.

lbz %r3,112+0(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_SYSV_TYPE_SMALL_STRUCT + 2. Two byte struct.

lhz %r3,112+0(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_SYSV_TYPE_SMALL_STRUCT + 3. Three byte struct.

lwz %r3,112+0(%r1)
srwi %r3,%r3,8
mtlr %r0
b .Lfinish

# case FFI_SYSV_TYPE_SMALL_STRUCT + 4. Four byte struct.

lwz %r3,112+0(%r1)
mtlr %r0
addi %r1,%r1,144
blr

# case FFI_SYSV_TYPE_SMALL_STRUCT + 5. Five byte struct.

lwz %r3,112+0(%r1)
lwz %r4,112+4(%r1)
li %r5,24
b .Lstruct567

# case FFI_SYSV_TYPE_SMALL_STRUCT + 6. Six byte struct.

lwz %r3,112+0(%r1)
lwz %r4,112+4(%r1)
li %r5,16
b .Lstruct567

# case FFI_SYSV_TYPE_SMALL_STRUCT + 7. Seven byte struct.

lwz %r3,112+0(%r1)
lwz %r4,112+4(%r1)
li %r5,8
b .Lstruct567

# case FFI_SYSV_TYPE_SMALL_STRUCT + 8. Eight byte struct.

lwz %r3,112+0(%r1)
lwz %r4,112+4(%r1)
mtlr %r0
b .Lfinish

.Lstruct567:

subfic %r6,%r5,32
srw %r4,%r4,%r5
slw %r6,%r3,%r6
srw %r3,%r3,%r5
or %r4,%r6,%r4
mtlr %r0
addi %r1,%r1,144
blr

.Luint128:

lwz %r6,112+12(%r1)
mtlr %r0
addi %r1,%r1,144
blr

END(ffi_closure_SYSV)

.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

if defined _RELOCATABLE || defined __PIC__

.ascii "zR\0"    # CIE Augmentation

else

.ascii "\0"      # CIE Augmentation

endif

.uleb128 0x1     # CIE Code Alignment Factor
.sleb128 -4      # CIE Data Alignment Factor
.byte   0x41     # CIE RA Column

if defined _RELOCATABLE || defined __PIC__

.uleb128 0x1     # Augmentation size
.byte   0x1b     # FDE Encoding (pcrel sdata4)

endif

.byte   0xc      # DW_CFA_def_cfa
.uleb128 0x1
.uleb128 0x0
.align 2

.LECIE1: .LSFDE1:

.4byte  .LEFDE1-.LASFDE1         # FDE Length

.LASFDE1:

.4byte  .LASFDE1-.Lframe1        # FDE CIE offset

if defined _RELOCATABLE || defined __PIC__

.4byte  .LFB1-.  # FDE initial location

else

.4byte  .LFB1    # FDE initial location

endif

.4byte  .LFE1-.LFB1      # FDE address range

if defined _RELOCATABLE || defined __PIC__

.uleb128 0x0     # Augmentation size

endif

.byte   0x4      # DW_CFA_advance_loc4
.4byte  .LCFI0-.LFB1
.byte   0xe      # DW_CFA_def_cfa_offset
.uleb128 144
.byte   0x4      # DW_CFA_advance_loc4
.4byte  .LCFI1-.LCFI0
.byte   0x11     # DW_CFA_offset_extended_sf
.uleb128 0x41
.sleb128 -1
.align 2

.LEFDE1:

endif

if defined __ELF__ && defined __linux__

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

endif