Mercurial > pub > dyncall > dyncall
view dyncall/dyncall_call_mips_n64_gas.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 | 6bd0974d257b |
children |
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/* Package: dyncall Library: dyncall File: dyncall/dyncall_call_mips_n64_gas.s Description: mips "n64" abi call kernel implementation in GNU Assembler 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. */ .section .mdebug.abi64 .previous .abicalls .text .align 2 .globl dcCall_mips_n64 .ent dcCall_mips_n64 dcCall_mips_n64: /* Stack-frame prolog */ # .frame $fp,64,$31 /* vars=16, regs=3/0, args=0, extra=16 */ # .mask 0xd0000000,-8 # .fmask 0x00000000,0 dsubu $sp,$sp,64 sd $31,48($sp) /* save return address register (ra) */ sd $30,40($sp) /* save frame pointer register (fp) */ sd $28,32($sp) /* save global pointer register (gp) */ move $fp,$sp /* arguments: */ /* $4 target function */ /* $5 register data */ /* $6 stack size */ /* $7 stack data */ /* allocate argument stack space */ dsubu $sp, $sp, $6 /* copy stack data */ /* n64 abi call assumptions: - stack data is 16-byte aligned. - no extra-storage for arguments passed via registers. */ /* $12 source pointer (parameter stack data) */ /* $14 destination (stack pointer) */ /* $6 byte count */ move $12, $7 move $14, $sp .next: beq $6, $0, .skip # nop daddiu $6, $6, -8 ld $2, 0($12) sd $2, 0($14) daddiu $12,$12, 8 daddiu $14,$14, 8 b .next .skip: move $25, $4 /* load registers */ /* locals: */ /* $13 = register data */ /* $14 = useDouble flags */ move $13, $5 ld $14, 128($13) /* load integer parameter registers */ ld $4 , 0($13) ld $5 , 8($13) ld $6 ,16($13) ld $7 ,24($13) ld $8 ,32($13) ld $9 ,40($13) ld $10,48($13) ld $11,56($13) /* load float-or-double floating pointer parameter registers a 64-bit bitmask given at byte offset 128 of regdata indicates if loading a float (bit cleared) or double (bit set), starting at bit position 0 in bitmask. */ .t0: and $15, $14, 1 bgtz $15, .d0 .f0: l.s $f12, 64($13) j .t1 .d0: l.d $f12, 64($13) .t1: and $15, $14, 2 bgtz $15, .d1 .f1: l.s $f13, 72($13) j .t2 .d1: l.d $f13, 72($13) .t2: and $15, $14, 4 bgtz $15, .d2 .f2: l.s $f14, 80($13) j .t3 .d2: l.d $f14, 80($13) .t3: and $15, $14, 8 bgtz $15, .d3 .f3: l.s $f15, 88($13) j .t4 .d3: l.d $f15, 88($13) .t4: and $15, $14, 16 bgtz $15, .d4 .f4: l.s $f16, 96($13) j .t5 .d4: l.d $f16, 96($13) .t5: and $15, $14, 32 bgtz $15, .d5 .f5: l.s $f17,104($13) j .t6 .d5: l.d $f17,104($13) .t6: and $15, $14, 64 bgtz $15, .d6 .f6: l.s $f18,112($13) j .t7 .d6: l.d $f18,112($13) .t7: and $15, $14, 128 bgtz $15, .d7 .f7: l.s $f19,120($13) j .fregend .d7: l.d $f19,120($13) .fregend: /* jump-and-link to register $25 */ jal $31, $25 nop /* branch-delay slot - no nop according to gcc assembly */ /* output, but let's play safe */ /* Stack-frame epilog */ move $sp,$fp ld $ra,48($sp) /* restore ra register */ ld $fp,40($sp) /* restore fp register */ ld $gp,32($sp) /* restore gp register */ daddu $sp,$sp,64 j $ra .end dcCall_mips_n64 .size dcCall_mips_n64, .-dcCall_mips_n64