Mercurial > pub > dyncall > dyncall
view dyncallback/dyncall_args_arm32.c @ 166:d5705f226298
- added portasm support for adding .section .note.GNU-stack "hints" marking generated .o files from assembly files as not needing an executable stack
* needed to be done manually in assembly files, in contrast to C translation units where gcc adds such hints automatically
* this is for security, and better/easier integration of dyncall into other projects and builds, as dyncall doesn't need an executable stack
* thanks to Thorsten Behrens for bringing this up to our intention and providing a first analysis
* currently only done on Linux, but will be added across other platforms (where applicable) after some testing
author | cslag |
---|---|
date | Thu, 05 Jan 2017 11:07:29 +0100 |
parents | 170cde9e2a83 |
children | f5577f6bf97a |
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/* Package: dyncall Library: dyncallback File: dyncallback/dyncall_args_arm32.c Description: Callback's Arguments VM - Implementation for ARM32 (ARM and THUMB mode) License: Copyright (c) 2007-2016 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_args_arm32.h" static void arm_align_64(DCArgs* args) { /* Look at signature to see if current calling convention needs alignment */ /* or not (e.g. EABI has different alignment). If nothing specified, fall */ /* back to default behaviour for this platform. */ /* @@@ check signature string */ int sig = #if defined(DC__ABI_ARM_EABI) || defined(DC__ABI_ARM_HF) 0; /* EABI */ #else 1; /* ATPCS */ #endif if(sig == 0) { if(args->reg_count < 4) args->reg_count = (args->reg_count+1)&~1; if(args->reg_count >= 4 && (int)args->stack_ptr & 4) ++args->stack_ptr; } } static void* arm_word(DCArgs* args) { if(args->reg_count < 4) return &args->reg_data[args->reg_count++]; else return (void*)args->stack_ptr++; } static DCfloat arm_float(DCArgs* args) { #if defined(DC__ABI_ARM_HF) DCfloat f; if(args->freg_count < 16) { f = args->f[args->freg_count++]; /* if freg_count was odd, sync with dreg_count */ if(!(args->freg_count & 1) && (args->freg_count < args->dreg_count)) args->freg_count = args->dreg_count; return f; } #endif return *(DCfloat*)arm_word(args); } static DCdouble arm_double(DCArgs* args) { union { DCdouble d; DClong l[2]; } d; #if defined(DC__ABI_ARM_HF) if(args->dreg_count < args->freg_count) args->dreg_count = (args->freg_count+1)&0x1e; /* clear last bit, counter won't be higher than 16, anyways */ if(args->dreg_count < 16) { d.d = *(DCdouble*)&args->f[args->dreg_count]; args->dreg_count += 2; /* freg_count is either odd (pointing to a gap), or always the same as dreg_count */ if(!(args->freg_count & 1)) args->freg_count = args->dreg_count; return d.d; } args->freg_count = 16; /* fp registers all full - need to use stack now: stop filling gaps for single precision, also */ #endif arm_align_64(args); d.l[0] = *(DClong*)arm_word(args); d.l[1] = *(DClong*)arm_word(args); return d.d; } static DClonglong arm_longlong(DCArgs* args) { union { DClonglong ll; DClong l[2]; } ll; arm_align_64(args); ll.l[0] = *(DClong*)arm_word(args); ll.l[1] = *(DClong*)arm_word(args); return ll.ll; } // ---------------------------------------------------------------------------- // C API implementation: // base operations: DClonglong dcbArgLongLong (DCArgs* p) { return arm_longlong(p); } DClong dcbArgLong (DCArgs* p) { return *(DClong*)arm_word(p); } DCint dcbArgInt (DCArgs* p) { return (DCint) dcbArgLong(p); } DCchar dcbArgChar (DCArgs* p) { return (DCchar) dcbArgLong(p); } DCshort dcbArgShort (DCArgs* p) { return (DCshort) dcbArgLong(p); } DCbool dcbArgBool (DCArgs* p) { return (dcbArgLong(p) == 0) ? 0 : 1; } DCuint dcbArgUInt (DCArgs* p) { return (DCuint) dcbArgInt(p); } DCuchar dcbArgUChar (DCArgs* p) { return (DCuchar) dcbArgChar(p); } DCushort dcbArgUShort (DCArgs* p) { return (DCushort) dcbArgShort(p); } DCulong dcbArgULong (DCArgs* p) { return (DCulong) dcbArgLong(p); } DCulonglong dcbArgULongLong(DCArgs* p) { return (DCulonglong)dcbArgLongLong(p); } DCpointer dcbArgPointer (DCArgs* p) { return (DCpointer) dcbArgLong(p); } DCdouble dcbArgDouble (DCArgs* p) { return arm_double(p); } DCfloat dcbArgFloat (DCArgs* p) { return arm_float(p); }