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/*
Package: dyncall
Library: dyncallback
File: dyncallback/dyncall_callback_arm64.s
Description: Callback Thunk - Implementation for ARM64 / ARMv8 / AAPCS64
License:
Copyright (c) 2015 Daniel Adler <dadler@uni-goettingen.de>,
Tassilo Philipp <tphilipp@potion-studios.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.
*/
// struct DCCallback
// type off size
// ---------|------|------
// DCThunk | 0 | 32
// handler | 32 | 8
// userdata | 40 | 8
#include "../portasm/portasm-arm.S"
.align 4
GLOBAL_C(dcCallbackThunkEntry)
ENTRY_C(dcCallbackThunkEntry)
// input:
// x9: DCCallback* pcb
// x0..x7 ?? GP regs
// d0..d7 ?? FP/SIMD regs
// sp... ?? arguments on stack
//
// locals:
// type off size
// ---------|------|------
// Frame 0 16
// DCArgs 16 168
// DCValue 184 16
//
// size 200
// aligned 208
//
// locals:
// x10: sp
// x11: DCArgs* args
mov x10, sp
stp x29, x30, [sp, #-208 ]!
mov x29, sp
add x11, x29 , #16
// save integer registers
stp x0, x1, [x11, #0 ]
stp x2, x3, [x11, #16]
stp x4, x5, [x11, #32]
stp x6, x7, [x11, #48]
stp d0, d1, [x11, #64]
stp d2, d3, [x11, #80]
stp d4, d5, [x11, #96]
stp d6, d7, [x11, #112]
eor x12, x12, x12
stp x10,x12,[x11, #128] // sp=sp, i=0, f=0
str x12, [x11, #144] // s=0, reserved=0
// call handler:
// args:
// x0: DCCallback* pcb
// x1: DCArgs* args
// x2: DCValue* result
// x3: void* userdata
mov x0 , x9
add x1 , x29 , #16
add x2 , x29 , #184
ldr x3 , [x9 , #40]
ldr x11, [x9 , #32]
blr x11
and w0, w0, #255
cmp w0, 'f'
b.eq .retf
cmp w0, 'd'
b.eq .retf
.reti:
ldr x0, [x29, #184]
b .ret
.retf:
ldr d0, [x29, #184]
.ret:
ldp x29, x30, [sp], #208
ret
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