Mercurial > pub > dyncall > dyncall
view dyncallback/dyncall_callback_arm64.S @ 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 | 03c516772c65 |
children | f5577f6bf97a |
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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