333 lines
8.5 KiB
PHP
333 lines
8.5 KiB
PHP
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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/ Shorthand notation for widely-acknowledged sections.
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.macro .rodata
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.section .rodata,"a",@progbits
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.endm
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.macro .init
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.section .init,"ax",@progbits
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.endm
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.macro .real
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.section .text.real,"ax",@progbits
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.endm
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.macro .text.startup
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.section .text.startup,"ax",@progbits
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.endm
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.macro .text.exit
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.section .text.exit,"ax",@progbits
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.endm
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.macro .firstclass
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.section .text.hot,"ax",@progbits
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.endm
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.macro .text.unlikely
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.section .text.unlikely,"ax",@progbits
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.endm
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.macro .text.likely
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.section .text.hot,"ax",@progbits
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.endm
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.macro .text.modernity
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.section .text.modernity,"ax",@progbits
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.align 16
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.endm
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.macro .text.antiquity
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.section .text.antiquity,"ax",@progbits
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.endm
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.macro .text.hot
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.section .text.hot,"ax",@progbits
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.endm
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.macro .preinit_array
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.section .preinit_array,"a",@init_array
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.endm
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.macro .init_array
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.section .init_array,"a",@init_array
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.endm
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.macro .text.windows
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.section .text.windows,"ax",@progbits
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.endm
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/ Mergeable numeric constant sections.
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/
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/ @note linker de-dupes item/values across whole compile
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/ @note therefore item/values are reordered w.r.t. link order
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/ @note therefore no section relative addressing
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.macro .rodata.cst4
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.section .rodata.cst4,"aM",@progbits,4
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.align 4
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.endm
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.macro .rodata.cst8
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.section .rodata.cst8,"aM",@progbits,8
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.align 8
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.endm
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.macro .rodata.cst16
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.section .rodata.cst16,"aM",@progbits,16
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.align 16
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.endm
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.macro .rodata.cst32
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.section .rodata.cst32,"aM",@progbits,32
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.align 32
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.endm
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.macro .rodata.cst64
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.section .rodata.cst64,"aM",@progbits,64
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.align 64
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.endm
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.macro .tdata
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.section .tdata,"awT",@progbits
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.align 4
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.endm
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.macro .tbss
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.section .tdata,"awT",@nobits
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.align 4
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.endm
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/ Mergeable NUL-terminated UTF-8 string constant section.
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/
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/ @note linker de-dupes C strings here across whole compile
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/ @note therefore item/values are reordered w.r.t. link order
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/ @note therefore no section relative addressing
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.macro .rodata.str1.1
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.section .rodata.str1.1,"aSM",@progbits,1
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.align 1
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.endm
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/ Locates unreferenced code invulnerable to --gc-sections.
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.macro .keep.text
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.section .keep.text,"ax",@progbits
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.endm
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/ Flags code as only allowed for testing purposes.
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.macro .testonly
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.section .test,"ax",@progbits
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.endm
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/ Makes code runnable while code morphing.
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.macro .privileged
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.section .privileged,"ax",@progbits
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.endm
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/ Post-Initialization Read-Only (PIRO) BSS section.
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/ @param ss is an optional string, for control image locality
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.macro .piro ss
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.ifnb \ss
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.section .piro.sort.bss.\ss,"aw",@nobits
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.else
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.section .piro.bss,"aw",@nobits
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.endif
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.endm
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/ Helpers for Cosmopolitan _init() amalgamation magic.
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/ @param name should be consistent across macros for a module
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/ @see libc/runtime/_init.S
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.macro .initro number:req name:req
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.section .initro.\number\().\name,"a",@progbits
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.align 8
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.endm
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.macro .initbss number:req name:req
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.section .piro.bss.init.2.\number\().\name,"aw",@nobits
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.align 8
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.endm
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.macro .init.start number:req name:req
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.section .init.\number\().\name,"ax",@progbits
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\name:
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.endm
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.macro .init.end number:req name:req bnd=globl vis
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.endfn \name,\bnd,\vis
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.previous
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.endm
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/ Declares alternative implementation of function.
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/ @param implement e.g. tinymath_pow
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/ @param canonical e.g. pow
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.macro .alias implement:req canonical:req
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.equ \canonical,\implement
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.weak \canonical
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.endm
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/ Ends function definition.
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/ @cost saves 1-3 lines of code
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.macro .endfn name:req bnd vis
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.size \name,.-\name
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.type \name,@function
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.ifnb \bnd
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.\bnd \name
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.endif
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.ifnb \vis
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.\vis \name
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.endif
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.endm
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/ Ends variable definition.
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/ @cost saves 1-3 lines of code
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.macro .endobj name:req bnd vis
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.size \name,.-\name
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.type \name,@object
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.ifnb \bnd
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.\bnd \name
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.endif
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.ifnb \vis
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.\vis \name
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.endif
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.endm
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/ Custom emulator instruction for bottom stack frame.
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.macro bofram endfunc:req
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.byte 0x0f,0x1f,0x45,\endfunc-. # nopl disp8(%rbp)
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.endm
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/ Overrides LOOP instruction.
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/ With its mop-Fusion Mexican equivalent.
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/ Thus avoiding 3x legacy pipeline slowdown.
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.macro loop label:req
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.byte 0x83,0xe9,0x01 # sub $1,%ecx
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jnz \label
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.endm
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/ Pushes CONSTEXPR ∈ [-128,127].
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/ @note assembler is wrong for non-literal constexprs
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.macro pushb x:req
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.byte 0x6a,\x
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.endm
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/ Sign-extends CONSTEXPR ∈ [-128,127] to REGISTER.
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/ @cost ≥1 cycles, -2 bytes
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.macro pushpop constexpr:req register:req
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pushb \constexpr
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pop \register
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.endm
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/ Moves REGISTER to REGISTER.
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/ @cost ≥1 cycles, -1 REX byte
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.macro movpp src:req dest:req
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push \src
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pop \dest
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.endm
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/ Declares optional function.
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.macro .optfn fn:req
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.globl \fn
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.weak \fn
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.equ \fn,missingno
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.type \fn,@function
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.endm
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/ Embeds fixed-width zero-filled string table.
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/ @note zero-padded ≠ nul-terminated
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.macro .fxstr width head rest:vararg
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.ifnb \head
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0: .ascii "\head"
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.org 0b+\width
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.fxstr \width,\rest
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.endif
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.endm
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/ Embeds Fixed-Width Zero-Padded String.
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/ @note .fxstr is better
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.macro .ascin str:req fieldsize:req
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1347: .ascii "\str"
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.org 1347b+\fieldsize,0x00
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.endm
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/ Marks symbols as object en-masse.
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/ @note zero-padded ≠ nul-terminated
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.macro .object symbol rest:vararg
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.ifnb \symbol
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.type \symbol,@object
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.object \rest
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.endif
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.endm
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/ Pads function prologue unconditionally for runtime hooking.
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/ @cost ≥0.3 cycles, 5 bytes
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/ @see .profilable
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.macro .hookable
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/ nopl 0x00(%rax,%rax,1)
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83457: .byte 0x0f,0x1f,0x44,0x00,0x00
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.pushsection __mcount_loc,"a",@progbits
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.quad 83457b
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.popsection
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.endm
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/ Puts initialized data in uninitialized data section.
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.macro .bsdata name:req expr:req bnd vis
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.pushsection .initbss.300._init_\name,"aw",@nobits
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\name: .quad 0
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.endobj \name,\bnd,\vis
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.popsection
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.pushsection .initro.300._init_\name,"a",@progbits
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.quad \expr
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.popsection
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.pushsection .init.300._init_\name,"ax",@progbits
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_init_\name:
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movsq
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.endfn _init_\name
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.popsection
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.endm
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/ ICE Breakpoint.
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/ Modern gas forgot this but objdump knows
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/ @mode long,legacy,real
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.macro icebp
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.byte 0xF1
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.endm
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.macro int1
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icebp
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.endm
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/ Sets breakpoint for software debugger.
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/ @mode long,legacy,real
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.macro .softicebp
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.byte 0x53 # push bx
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.byte 0x87,0xdb # xchg bx,bx (bochs breakpoint)
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.byte 0x5b # pop bx
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.byte 0x66,0x90 # xchg ax,ax (microsoft breakpoint)
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int3 # gdb breakpoint
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.endm
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/ Assembles Intel Official 4-Byte NOP.
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.macro fatnop4
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.byte 0x0f,0x1f,0x40,0x00
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.endm
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/ Pulls unrelated module into linkage.
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/
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/ In order for this technique to work with --gc-sections, another
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/ module somewhere might want to weakly reference whats yoinked.
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.macro yoink symbol:req
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.pushsection .yoink
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nop "\symbol"
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.popsection
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.endm
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.macro .yoink symbol:req
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.pushsection .yoink
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nop "\symbol"
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.popsection
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.endm
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/ Calls Windows function.
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/
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/ @param cx,dx,r8,r9,stack
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/ @return ax
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/ @clob ax,cx,dx,r8-r11
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.macro ntcall symbol:req
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sub $32,%rsp
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call *\symbol(%rip)
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add $32,%rsp
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.endm
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