/* -----------------------------------------------------------------------
sysv.S - Copyright (c) 1998 Geoffrey Keating
Copyright (C) 2007 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 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>
#ifndef POWERPC64
.globl ffi_prep_args_SYSV
ENTRY(ffi_call_SYSV)
.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)
.LCFI1:
stw %r29,-12(%r8)
.LCFI2:
stw %r30, -8(%r8)
.LCFI3:
stw %r31, -4(%r8)
.LCFI4:
stw %r9, 4(%r8)
.LCFI5:
/* Save arguments over call... */
mr %r31,%r5 /* flags, */
mr %r30,%r6 /* rvalue, */
mr %r29,%r7 /* function address, */
mr %r28,%r8 /* our AP. */
.LCFI6:
/* Call ffi_prep_args_SYSV. */
mr %r4,%r1
bl ffi_prep_args_SYSV@local
/* 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. */
lwz %r3,-16-(8*4)(%r28)
lwz %r4,-16-(7*4)(%r28)
lwz %r5,-16-(6*4)(%r28)
lwz %r6,-16-(5*4)(%r28)
bf- 5,1f
nop
lwz %r7,-16-(4*4)(%r28)
lwz %r8,-16-(3*4)(%r28)
lwz %r9,-16-(2*4)(%r28)
lwz %r10,-16-(1*4)(%r28)
nop
1:
#ifndef __NO_FPRS__
/* Load all the FP registers. */
bf- 6,2f
lfd %f1,-16-(8*4)-(8*8)(%r28)
lfd %f2,-16-(8*4)-(7*8)(%r28)
lfd %f3,-16-(8*4)-(6*8)(%r28)
lfd %f4,-16-(8*4)-(5*8)(%r28)
nop
lfd %f5,-16-(8*4)-(4*8)(%r28)
lfd %f6,-16-(8*4)-(3*8)(%r28)
lfd %f7,-16-(8*4)-(2*8)(%r28)
lfd %f8,-16-(8*4)-(1*8)(%r28)
#endif
2:
/* Make the call. */
bctrl
/* Now, deal with the return value. */
mtcrf 0x01,%r31 /* cr7 */
bt- 31,L(small_struct_return_value)
bt- 30,L(done_return_value)
#ifndef __NO_FPRS__
bt- 29,L(fp_return_value)
#endif
stw %r3,0(%r30)
bf+ 28,L(done_return_value)
stw %r4,4(%r30)
mtcrf 0x02,%r31 /* cr6 */
bf 27,L(done_return_value)
stw %r5,8(%r30)
stw %r6,12(%r30)
/* Fall through... */
L(done_return_value):
/* Restore the registers we used and return. */
lwz %r9, 4(%r28)
lwz %r31, -4(%r28)
mtlr %r9
lwz %r30, -8(%r28)
lwz %r29,-12(%r28)
lwz %r28,-16(%r28)
lwz %r1,0(%r1)
blr
#ifndef __NO_FPRS__
L(fp_return_value):
bf 28,L(float_return_value)
stfd %f1,0(%r30)
mtcrf 0x02,%r31 /* cr6 */
bf 27,L(done_return_value)
stfd %f2,8(%r30)
b L(done_return_value)
L(float_return_value):
stfs %f1,0(%r30)
b L(done_return_value)
#endif
L(small_struct_return_value):
/*
* The C code always allocates a properly-aligned 8-byte bounce
* buffer to make this assembly code very simple. Just write out
* r3 and r4 to the buffer to allow the C code to handle the rest.
*/
stw %r3, 0(%r30)
stw %r4, 4(%r30)
b L(done_return_value)
.LFE1:
END(ffi_call_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 0xd /* DW_CFA_def_cfa_register */
.uleb128 0x08
.byte 0x4 /* DW_CFA_advance_loc4 */
.4byte .LCFI5-.LCFI0
.byte 0x11 /* DW_CFA_offset_extended_sf */
.uleb128 0x41
.sleb128 -1
.byte 0x9f /* DW_CFA_offset, column 0x1f */
.uleb128 0x1
.byte 0x9e /* DW_CFA_offset, column 0x1e */
.uleb128 0x2
.byte 0x9d /* DW_CFA_offset, column 0x1d */
.uleb128 0x3
.byte 0x9c /* DW_CFA_offset, column 0x1c */
.uleb128 0x4
.byte 0x4 /* DW_CFA_advance_loc4 */
.4byte .LCFI6-.LCFI5
.byte 0xd /* DW_CFA_def_cfa_register */
.uleb128 0x1c
.align 2
.LEFDE1:
#if defined __ELF__ && defined __linux__
.section .note.GNU-stack,"",@progbits
#endif
#endif