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/*
Package: dyncall
Library: dyncall
File: dyncall/dyncall_call_arm32_arm_armhf.S
Description: Call Kernel for ARM 32-bit ARM Architecture - Hard Float
License:
Copyright (c) 2007-2015 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.
*/
#include "../portasm/portasm-arm.S"
/* ============================================================================
DynCall Call Kernel for ARM 32-bit ARM Architecture Hard-Float
----------------------------------------------------------------------------
C Interface:
dcCall_arm32_armhf (DCpointer target, DCpointer argv, DCsize size, DCfloat* regdata);
This Call Kernel was tested on Raspberry Pi/Raspbian (Debian)
*/
.text
.code 32 /* ARM mode */
.arch armv6
.fpu vfp
GLOBAL_C(dcCall_arm32_armhf)
ENTRY_C(dcCall_arm32_armhf)
/* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */
mov r12 , r13 /* Stack ptr (r13) -> temporary (r12). */
stmdb r13!, {r4-r5, r11, r12, r14} /* Permanent registers and stack pointer (now in r12), etc... -> save area on stack (except counter). */
mov r11 , r12 /* Set frame ptr. */
mov r4 , r0 /* r4 = 'fptr' (1st argument is passed in r0). */
mov r5 , r1 /* r5 = 'args' (2nd argument is passed in r1). */
/* Load 16 single-precision registers (= 8 double-precision registers). */
flds s0, [r3,#0 ]
flds s1, [r3,#4 ]
flds s2, [r3,#8 ]
flds s3, [r3,#12]
flds s4, [r3,#16]
flds s5, [r3,#20]
flds s6, [r3,#24]
flds s7, [r3,#28]
flds s8, [r3,#32]
flds s9, [r3,#36]
flds s10, [r3,#40]
flds s11, [r3,#44]
flds s12, [r3,#48]
flds s13, [r3,#52]
flds s14, [r3,#56]
flds s15, [r3,#60]
sub r2 , r2 , #16
cmp r2, #0
ble armhf_call
sub r13, r13, r2
and r13, r13, #-8 /* align 8-byte. */
mov r3, #0 /* Init byte counter. */
add r1 , r1 , #16
armhf_pushArgs:
ldr r0, [r1, +r3] /* Load word into r0. */
str r0, [r13, +r3] /* Push word onto stack. */
add r3, r3, #4 /* Increment byte counter. */
cmp r2, r3
bne armhf_pushArgs
armhf_call:
ldmia r5, {r0-r3} /* Load first 4 arguments for new call into r0-r3. */
/* 'blx %r4' workaround for ARMv4t: */
mov r14, r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */
bx r4 /* Call (ARM/THUMB), available for ARMv4t. */
/* Epilog. */
ldmdb r11, {r4-r5, r11, r13, r15} /* Restore permanent registers (ignore temporary (r12), restore stack ptr and program counter).@@@db not needed since we rewrite r13? */
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