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/*
Package: dyncall
Library: dyncallback
File: dyncallback/dyncall_callback_ppc64.S
Description: Callback Thunk - Implementation for PowerPC 64-bit
License:
Copyright (c) 2014-2015 Masanori Mitsugi <mitsugi@linux.vnet.ibm.com>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "../portasm/portasm-ppc.S"
/* Callback Thunk Entry code for PowerPC 64-bit. */
/* Stack Frame Layout:
296 DCValue ( 8 )
112 DCArgs ( 64+104+8+4+4 = 184 )
48 Parameter area ( 8*8 = 64 )
0 Linkage area ( 48 )
*/
/* Constants. */
INT_REGS = 8
FLOAT_REGS = 13
SIZEOF_GPR = 8
SIZEOF_FPR = 8
/* Linkage area. */
LINK_SP = 0
LINK_CR = 8
LINK_LR = 16
LINK_OFFSET = 0
#if DC__ABI_PPC64_ELF_V == 2
LINK_TOC = 24
LINK_SIZE = 32
#else
LINK_TOC = 40
LINK_SIZE = 48
#endif
/* Parameter area. */
PAR_OFFSET = LINK_SIZE
#if DC__ABI_PPC64_ELF_V == 2
PAR_SIZE = 0
#else
PAR_SIZE = 64
#endif
/* local struct DCArgs */
ARGS_OFFSET = (PAR_OFFSET+PAR_SIZE)
ARGS_SIZE = (SIZEOF_GPR*INT_REGS)+(SIZEOF_FPR*FLOAT_REGS) + 8 + 4 * 4
/* local struct DCValue */
RESULT_OFFSET = (ARGS_OFFSET+ARGS_SIZE)
RESULT_SIZE = 8
/* additional locals (reg 30/31) */
LOCALS_OFFSET = (RESULT_OFFSET+RESULT_SIZE)
LOCALS_SIZE = 2*SIZEOF_GPR
/* total */
FRAME_SIZE = ( (LOCALS_OFFSET+LOCALS_SIZE)+15 & (-16) )
/* struct DCCallback */
#if DC__ABI_PPC64_ELF_V == 2
DCB_THUNK = 0
DCB_HANDLER = 48
DCB_STACKCLEAN = 56
DCB_USERDATA = 64
#else
DCB_THUNK = 0
DCB_HANDLER = 64
DCB_STACKCLEAN = 72
DCB_USERDATA = 80
#endif
/* struct DCArgs */
DCA_IARRAY = 0
DCA_FARRAY = SIZEOF_GPR*INT_REGS
DCA_SP = DCA_FARRAY + SIZEOF_FPR*FLOAT_REGS
DCA_ICOUNT = DCA_SP + 8
DCA_FCOUNT = DCA_ICOUNT + 4
/* struct DCValue */
DCV_INT = 0
DCV_FLOAT = 0
DCV_SIZE = 8
iregfile = ARGS_OFFSET+DCA_IARRAY
fregfile = ARGS_OFFSET+DCA_FARRAY
save_sp = ARGS_OFFSET+DCA_SP
icount = ARGS_OFFSET+DCA_ICOUNT
fcount = ARGS_OFFSET+DCA_FCOUNT
/*
Thunk entry:
R2 = DCCallback*
*/
.text
.global dcCallbackThunkEntry
.type dcCallbackThunkEntry, @function
#if DC__ABI_PPC64_ELF_V != 2
.section .opd, "aw"
.align 3
#endif
dcCallbackThunkEntry:
#if DC__ABI_PPC64_ELF_V != 2
.quad .dcCallbackThunkEntry, .TOC.@tocbase, 0
.previous
.global .dcCallbackThunkEntry
.dcCallbackThunkEntry:
#endif
mflr r0
std r0, 16(r1) /* store return address */
std r31, -8(r1) /* store preserved registers (r31) */
addi r12, r1, PAR_OFFSET /* temporary r12 = parameter area on callers stack frame */
stdu r1, -FRAME_SIZE(r1) /* save callers stack pointer and make new stack frame. */
std r3, iregfile+0*8(r1) /* spill 8 integer parameter registers */
std r4, iregfile+1*8(r1)
std r5, iregfile+2*8(r1)
std r6, iregfile+3*8(r1)
std r7, iregfile+4*8(r1)
std r8, iregfile+5*8(r1)
std r9, iregfile+6*8(r1)
std r10,iregfile+7*8(r1)
stfd f1, fregfile+ 0*8(r1) /* spill 13 float parameter registers */
stfd f2, fregfile+ 1*8(r1)
stfd f3, fregfile+ 2*8(r1)
stfd f4, fregfile+ 3*8(r1)
stfd f5, fregfile+ 4*8(r1)
stfd f6, fregfile+ 5*8(r1)
stfd f7, fregfile+ 6*8(r1)
stfd f8, fregfile+ 7*8(r1)
stfd f9, fregfile+ 8*8(r1)
stfd f10,fregfile+ 9*8(r1)
stfd f11,fregfile+10*8(r1)
stfd f12,fregfile+11*8(r1)
stfd f13,fregfile+12*8(r1)
/* initialize struct DCCallback */
std r12,save_sp(r1) /* init stack pointer */
xor r0, r0, r0 /* init register counters */
std r0, icount(r1)
std r0, fcount(r1)
std r0, RESULT_OFFSET(r1)
/* invoke callback handler */
mr r3, r11 /* arg 1: DCCallback* pcb */
addi r4, r1, ARGS_OFFSET /* arg 2: DCArgs* args */
addi r5, r1, RESULT_OFFSET /* arg 3: DCValue* result */
ld r6, DCB_USERDATA(r11) /* arg 4: void* userdata */
/* branch-and-link to DCCallback.handler */
ld r12, DCB_HANDLER(r11)
std r2, LINK_TOC(r1)
#if DC__ABI_PPC64_ELF_V != 2
ld r2, 8(r12)
ld r0, 0(r12)
mtctr r0
#else
mtctr r12
#endif
bctrl
addi r0, r1, RESULT_OFFSET /* r0 = DCValue* */
/* switch on base result type */
cmpi cr0, r3, 'B
beq .i64
cmpi cr0, r3, 'i
beq .i64
cmpi cr0, r3, 'c
beq .i64
cmpi cr0, r3, 's
beq .i64
cmpi cr0, r3, 'l
beq .i64
cmpi cr0, r3, 'f
beq .f32
cmpi cr0, r3, 'd
beq .f64
cmpi cr0, r3, 'p
beq .i64
.void: /* ignore result (void call) */
b .end
.i64: /* result is 64-bit long long result */
ld r3, RESULT_OFFSET + DCV_INT(r1)
b .end
.f32: /* result is C float result */
lfs f1, RESULT_OFFSET + DCV_FLOAT(r1)
b .end
.f64: /* result is C double result */
lfd f1, RESULT_OFFSET + DCV_FLOAT(r1)
b .end
.end:
ld r2, LINK_TOC(r1)
ld r1, 0(r1) /* restore stack pointer */
ld r31, -8(r1) /* restore preserved registers */
ld r0, 16(r1) /* load link register with return address */
mtlr r0
blr /* branch back to link register */
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