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Brian Fiete 2019-08-23 11:56:54 -07:00
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/* -----------------------------------------------------------------------
darwin.S - Copyright (c) 2000 John Hornkvist
Copyright (c) 2004, 2010 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.
----------------------------------------------------------------------- */
#define LIBFFI_ASM
#if defined(__ppc64__)
#define MODE_CHOICE(x, y) y
#else
#define MODE_CHOICE(x, y) x
#endif
#define machine_choice MODE_CHOICE(ppc7400,ppc64)
; Define some pseudo-opcodes for size-independent load & store of GPRs ...
#define lgu MODE_CHOICE(lwzu, ldu)
#define lg MODE_CHOICE(lwz,ld)
#define sg MODE_CHOICE(stw,std)
#define sgu MODE_CHOICE(stwu,stdu)
#define sgux MODE_CHOICE(stwux,stdux)
; ... and the size of GPRs and their storage indicator.
#define GPR_BYTES MODE_CHOICE(4,8)
#define LOG2_GPR_BYTES MODE_CHOICE(2,3) /* log2(GPR_BYTES) */
#define g_long MODE_CHOICE(long, quad) /* usage is ".g_long" */
; From the ABI doc: "Mac OS X ABI Function Call Guide" Version 2009-02-04.
#define LINKAGE_SIZE MODE_CHOICE(24,48)
#define PARAM_AREA MODE_CHOICE(32,64)
#define SAVED_LR_OFFSET MODE_CHOICE(8,16) /* save position for lr */
/* If there is any FP stuff we make space for all of the regs. */
#define SAVED_FPR_COUNT 13
#define FPR_SIZE 8
#define RESULT_BYTES 16
/* This should be kept in step with the same value in ffi_darwin.c. */
#define ASM_NEEDS_REGISTERS 4
#define SAVE_REGS_SIZE (ASM_NEEDS_REGISTERS * GPR_BYTES)
#include <fficonfig.h>
#include <ffi.h>
#define JUMPTARGET(name) name
#define L(x) x
.text
.align 2
.globl _ffi_prep_args
.align 2
.globl _ffi_call_DARWIN
/* We arrive here with:
r3 = ptr to extended cif.
r4 = -bytes.
r5 = cif flags.
r6 = ptr to return value.
r7 = fn pointer (user func).
r8 = fn pointer (ffi_prep_args).
r9 = ffi_type* for the ret val. */
_ffi_call_DARWIN:
Lstartcode:
mr r12,r8 /* We only need r12 until the call,
so it does not have to be saved. */
LFB1:
/* Save the old stack pointer as AP. */
mr r8,r1
LCFI0:
/* Save the retval type in parents frame. */
sg r9,(LINKAGE_SIZE+6*GPR_BYTES)(r8)
/* Allocate the stack space we need. */
sgux r1,r1,r4
/* Save registers we use. */
mflr r9
sg r9,SAVED_LR_OFFSET(r8)
sg r28,-(4 * GPR_BYTES)(r8)
sg r29,-(3 * GPR_BYTES)(r8)
sg r30,-(2 * GPR_BYTES)(r8)
sg r31,-( GPR_BYTES)(r8)
#if !defined(POWERPC_DARWIN)
/* The TOC slot is reserved in the Darwin ABI and r2 is volatile. */
sg r2,(5 * GPR_BYTES)(r1)
#endif
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. r3 = extended cif, r4 = stack ptr copy. */
mr r4,r1
li r9,0
mtctr r12 /* r12 holds address of _ffi_prep_args. */
bctrl
#if !defined(POWERPC_DARWIN)
/* The TOC slot is reserved in the Darwin ABI and r2 is volatile. */
lg r2,(5 * GPR_BYTES)(r1)
#endif
/* 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. */
lg r3, (LINKAGE_SIZE )(r1)
lg r4, (LINKAGE_SIZE + GPR_BYTES)(r1)
lg r5, (LINKAGE_SIZE + 2 * GPR_BYTES)(r1)
lg r6, (LINKAGE_SIZE + 3 * GPR_BYTES)(r1)
nop
lg r7, (LINKAGE_SIZE + 4 * GPR_BYTES)(r1)
lg r8, (LINKAGE_SIZE + 5 * GPR_BYTES)(r1)
lg r9, (LINKAGE_SIZE + 6 * GPR_BYTES)(r1)
lg r10,(LINKAGE_SIZE + 7 * GPR_BYTES)(r1)
L1:
/* ... Load all the FP registers. */
bf 6,L2 /* No floats to load. */
lfd f1, -SAVE_REGS_SIZE-(13*FPR_SIZE)(r28)
lfd f2, -SAVE_REGS_SIZE-(12*FPR_SIZE)(r28)
lfd f3, -SAVE_REGS_SIZE-(11*FPR_SIZE)(r28)
lfd f4, -SAVE_REGS_SIZE-(10*FPR_SIZE)(r28)
nop
lfd f5, -SAVE_REGS_SIZE-( 9*FPR_SIZE)(r28)
lfd f6, -SAVE_REGS_SIZE-( 8*FPR_SIZE)(r28)
lfd f7, -SAVE_REGS_SIZE-( 7*FPR_SIZE)(r28)
lfd f8, -SAVE_REGS_SIZE-( 6*FPR_SIZE)(r28)
nop
lfd f9, -SAVE_REGS_SIZE-( 5*FPR_SIZE)(r28)
lfd f10,-SAVE_REGS_SIZE-( 4*FPR_SIZE)(r28)
lfd f11,-SAVE_REGS_SIZE-( 3*FPR_SIZE)(r28)
lfd f12,-SAVE_REGS_SIZE-( 2*FPR_SIZE)(r28)
nop
lfd f13,-SAVE_REGS_SIZE-( 1*FPR_SIZE)(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. */
/* m64 structure returns can occupy the same set of registers as
would be used to pass such a structure as arg0 - so take care
not to step on any possibly hot regs. */
/* Get the flags.. */
mtcrf 0x03,r31 ; we need c6 & cr7 now.
; FLAG_RETURNS_NOTHING also covers struct ret-by-ref.
bt 30,L(done_return_value) ; FLAG_RETURNS_NOTHING
bf 27,L(scalar_return_value) ; not FLAG_RETURNS_STRUCT
/* OK, so we have a struct. */
#if defined(__ppc64__)
bt 31,L(maybe_return_128) ; FLAG_RETURNS_128BITS, special case
/* OK, we have to map the return back to a mem struct.
We are about to trample the parents param area, so recover the
return type. r29 is free, since the call is done. */
lg r29,(LINKAGE_SIZE + 6 * GPR_BYTES)(r28)
sg r3, (LINKAGE_SIZE )(r28)
sg r4, (LINKAGE_SIZE + GPR_BYTES)(r28)
sg r5, (LINKAGE_SIZE + 2 * GPR_BYTES)(r28)
sg r6, (LINKAGE_SIZE + 3 * GPR_BYTES)(r28)
nop
sg r7, (LINKAGE_SIZE + 4 * GPR_BYTES)(r28)
sg r8, (LINKAGE_SIZE + 5 * GPR_BYTES)(r28)
sg r9, (LINKAGE_SIZE + 6 * GPR_BYTES)(r28)
sg r10,(LINKAGE_SIZE + 7 * GPR_BYTES)(r28)
/* OK, so do the block move - we trust that memcpy will not trample
the fprs... */
mr r3,r30 ; dest
addi r4,r28,LINKAGE_SIZE ; source
/* The size is a size_t, should be long. */
lg r5,0(r29)
/* Figure out small structs */
cmpi 0,r5,4
bgt L3 ; 1, 2 and 4 bytes have special rules.
cmpi 0,r5,3
beq L3 ; not 3
addi r4,r4,8
subf r4,r5,r4
L3:
bl _memcpy
/* ... do we need the FP registers? - recover the flags.. */
mtcrf 0x03,r31 ; we need c6 & cr7 now.
bf 29,L(done_return_value) /* No floats in the struct. */
stfd f1, -SAVE_REGS_SIZE-(13*FPR_SIZE)(r28)
stfd f2, -SAVE_REGS_SIZE-(12*FPR_SIZE)(r28)
stfd f3, -SAVE_REGS_SIZE-(11*FPR_SIZE)(r28)
stfd f4, -SAVE_REGS_SIZE-(10*FPR_SIZE)(r28)
nop
stfd f5, -SAVE_REGS_SIZE-( 9*FPR_SIZE)(r28)
stfd f6, -SAVE_REGS_SIZE-( 8*FPR_SIZE)(r28)
stfd f7, -SAVE_REGS_SIZE-( 7*FPR_SIZE)(r28)
stfd f8, -SAVE_REGS_SIZE-( 6*FPR_SIZE)(r28)
nop
stfd f9, -SAVE_REGS_SIZE-( 5*FPR_SIZE)(r28)
stfd f10,-SAVE_REGS_SIZE-( 4*FPR_SIZE)(r28)
stfd f11,-SAVE_REGS_SIZE-( 3*FPR_SIZE)(r28)
stfd f12,-SAVE_REGS_SIZE-( 2*FPR_SIZE)(r28)
nop
stfd f13,-SAVE_REGS_SIZE-( 1*FPR_SIZE)(r28)
mr r3,r29 ; ffi_type *
mr r4,r30 ; dest
addi r5,r28,-SAVE_REGS_SIZE-(13*FPR_SIZE) ; fprs
xor r6,r6,r6
sg r6,(LINKAGE_SIZE + 7 * GPR_BYTES)(r28)
addi r6,r28,(LINKAGE_SIZE + 7 * GPR_BYTES) ; point to a zeroed counter.
bl _darwin64_struct_floats_to_mem
b L(done_return_value)
#else
stw r3,0(r30) ; m32 the only struct return in reg is 4 bytes.
#endif
b L(done_return_value)
L(fp_return_value):
/* Do we have long double to store? */
bf 31,L(fd_return_value) ; FLAG_RETURNS_128BITS
stfd f1,0(r30)
stfd f2,FPR_SIZE(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)
L(scalar_return_value):
bt 29,L(fp_return_value) ; FLAG_RETURNS_FP
; ffi_arg is defined as unsigned long.
sg r3,0(r30) ; Save the reg.
bf 28,L(done_return_value) ; not FLAG_RETURNS_64BITS
#if defined(__ppc64__)
L(maybe_return_128):
std r3,0(r30)
bf 31,L(done_return_value) ; not FLAG_RETURNS_128BITS
std r4,8(r30)
#else
stw r4,4(r30)
#endif
/* Fall through. */
/* We want this at the end to simplify eh epilog computation. */
L(done_return_value):
/* Restore the registers we used and return. */
lg r29,SAVED_LR_OFFSET(r28)
; epilog
lg r31,-(1 * GPR_BYTES)(r28)
mtlr r29
lg r30,-(2 * GPR_BYTES)(r28)
lg r29,-(3 * GPR_BYTES)(r28)
lg r28,-(4 * GPR_BYTES)(r28)
lg r1,0(r1)
blr
LFE1:
.align 1
/* END(_ffi_call_DARWIN) */
/* Provide a null definition of _ffi_call_AIX. */
.text
.globl _ffi_call_AIX
.align 2
_ffi_call_AIX:
blr
/* END(_ffi_call_AIX) */
/* EH stuff. */
#define EH_DATA_ALIGN_FACT MODE_CHOICE(0x7c,0x78)
.static_data
.align LOG2_GPR_BYTES
LLFB0$non_lazy_ptr:
.g_long Lstartcode
.section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support
EH_frame1:
.set L$set$0,LECIE1-LSCIE1
.long L$set$0 ; Length of Common Information Entry
LSCIE1:
.long 0x0 ; CIE Identifier Tag
.byte 0x1 ; CIE Version
.ascii "zR\0" ; CIE Augmentation
.byte 0x1 ; uleb128 0x1; CIE Code Alignment Factor
.byte EH_DATA_ALIGN_FACT ; sleb128 -4; CIE Data Alignment Factor
.byte 0x41 ; CIE RA Column
.byte 0x1 ; uleb128 0x1; Augmentation size
.byte 0x10 ; FDE Encoding (indirect pcrel)
.byte 0xc ; DW_CFA_def_cfa
.byte 0x1 ; uleb128 0x1
.byte 0x0 ; uleb128 0x0
.align LOG2_GPR_BYTES
LECIE1:
.globl _ffi_call_DARWIN.eh
_ffi_call_DARWIN.eh:
LSFDE1:
.set L$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$3,LFE1-Lstartcode
.g_long L$set$3 ; FDE address range
.byte 0x0 ; uleb128 0x0; Augmentation size
.byte 0x4 ; DW_CFA_advance_loc4
.set L$set$4,LCFI0-Lstartcode
.long L$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:
.align 1