Mercurial > pub > dyncall > dyncall
diff dyncallback/dyncall_callback_arm32_arm_gas.S @ 38:fb416abb2059
- armhf callback support (not all working, yet)
author | cslag |
---|---|
date | Fri, 18 Dec 2015 19:07:17 +0100 |
parents | dyncallback/dyncall_callback_arm32_arm_gas.s@3e629dc19168 |
children | ecc9403e214a |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/dyncallback/dyncall_callback_arm32_arm_gas.S Fri Dec 18 19:07:17 2015 +0100 @@ -0,0 +1,80 @@ +/* + + Package: dyncall + Library: dyncallback + File: dyncallback/dyncall_callback_arm32_arm_gas.S + Description: Callback Thunk - Implementation for ARM32 (ARM mode) + License: + + Copyright (c) 2007-2011 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 "../dyncall/dyncall_macros.h" + +.text +.code 32 /* ARM mode */ + +.globl dcCallbackThunkEntry + +/* sizes */ +/* .set DCThunk_size , 8 */ +/* .set DCArgs_size , 24 */ /* for EABI/ATPCS/... */ +/* .set DCArgs_size , 76 */ /* for armhf */ +/* .set DCCallback_size, 20 */ +.set DCValue_size , 8 + +/* struct DCCallback offsets and size */ +/* .set CTX_thunk , 0 */ +.set CTX_handler , 12 +.set CTX_userdata , 16 + + +/* Called by thunk - thunk stores pointer to DCCallback in r12 */ +dcCallbackThunkEntry: + + /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */ + stmdb %r13, {%r4-%r11, %r13, %r14} /* Permanent registers and stack pointer, etc... -> save area on stack (except counter). */ + mov %r11, %r13 /* Set frame pointer. */ + sub %r13, %r13, #40 /* Adjust stack pointer. */ + + /* Grab arguments. */ + mov %r4, #0 +#if defined(DC__ABI_ARM_HF) + stmdb %r13!, {%r4} /* Init freg_count and dreg_count to 0 */ + stmdb %r13!, {%r4} + fstmdbd %r13!, {d0-d7} /* Store all fp-registers in DCArgs' f[16] */ +#endif + stmdb %r13!, {%r0-%r4, %r11} /* Spill first 4 args to DCArgs, along with reg_count (init to 0) and (stack) pointer to remaining args. */ + + /* Prepare callback handler call. */ + mov %r0, %r12 /* Parameter 0 (r0) = DCCallback pointer (r12, pointer to thunk). */ + mov %r1, %r13 /* Parameter 1 (r1) = DCArgs pointer (r13, stack pointer). */ + sub %r13, %r13, #DCValue_size /* Make room for return value. */ + mov %r2, %r13 /* Parameter 2 (r2) = results pointer. */ + ldr %r3, [%r12, #CTX_userdata] /* Parameter 3 (r3) = userdata pointer. */ + + /* Call. */ + ldr %r4, [%r12, #CTX_handler] /* Load callback handler pointer into r4. */ + mov %r14, %r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */ + bx %r4 /* Call. */ + + /* Return value. */ + ldmia %r13, {%r0, %r1} /* Load return value in r0 and r1. */ + + /* Epilog. */ + ldmdb %r11, {%r4-%r11, %r13, %r15} /* Restore permanent registers (restore stack ptr and program counter).@@@db not needed since we rewrite r13? */ +