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      1 // Copyright (c) 2014, Google Inc.
      2 //
      3 // Permission to use, copy, modify, and/or distribute this software for any
      4 // purpose with or without fee is hereby granted, provided that the above
      5 // copyright notice and this permission notice appear in all copies.
      6 //
      7 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      8 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      9 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     10 // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     11 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
     12 // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     13 // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     14 
     15 // This package generates chacha_vec_arm.S from chacha_vec.c.
     16 package main
     17 
     18 import (
     19 	"bufio"
     20 	"bytes"
     21 	"os"
     22 	"os/exec"
     23 	"strings"
     24 )
     25 
     26 const defaultCompiler = "/opt/gcc-linaro-4.9-2014.11-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc"
     27 
     28 func main() {
     29 	compiler := defaultCompiler
     30 	if len(os.Args) > 1 {
     31 		compiler = os.Args[1]
     32 	}
     33 
     34 	args := []string{
     35 		"-O3",
     36 		"-mcpu=cortex-a8",
     37 		"-mfpu=neon",
     38 		"-fpic",
     39 		"-DASM_GEN",
     40 		"-I", "../../include",
     41 		"-S", "chacha_vec.c",
     42 		"-o", "-",
     43 	}
     44 
     45 	output, err := os.OpenFile("chacha_vec_arm.S", os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
     46 	if err != nil {
     47 		panic(err)
     48 	}
     49 	defer output.Close()
     50 
     51 	output.WriteString(preamble)
     52 	output.WriteString(compiler)
     53 	output.WriteString(" ")
     54 	output.WriteString(strings.Join(args, " "))
     55 	output.WriteString("\n\n#if !defined(OPENSSL_NO_ASM)\n\n")
     56 
     57 	cmd := exec.Command(compiler, args...)
     58 	cmd.Stderr = os.Stderr
     59 	asm, err := cmd.StdoutPipe()
     60 	if err != nil {
     61 		panic(err)
     62 	}
     63 	if err := cmd.Start(); err != nil {
     64 		panic(err)
     65 	}
     66 
     67 	attr28 := []byte(".eabi_attribute 28,")
     68 	globalDirective := []byte(".global\t")
     69 	newLine := []byte("\n")
     70 	attr28Handled := false
     71 
     72 	scanner := bufio.NewScanner(asm)
     73 	for scanner.Scan() {
     74 		line := scanner.Bytes()
     75 
     76 		if bytes.Contains(line, attr28) {
     77 			output.WriteString(attr28Block)
     78 			attr28Handled = true
     79 			continue
     80 		}
     81 
     82 		output.Write(line)
     83 		output.Write(newLine)
     84 
     85 		if i := bytes.Index(line, globalDirective); i >= 0 {
     86 			output.Write(line[:i])
     87 			output.WriteString(".hidden\t")
     88 			output.Write(line[i+len(globalDirective):])
     89 			output.Write(newLine)
     90 		}
     91 	}
     92 
     93 	if err := scanner.Err(); err != nil {
     94 		panic(err)
     95 	}
     96 
     97 	if !attr28Handled {
     98 		panic("EABI attribute 28 not seen in processing")
     99 	}
    100 
    101 	if err := cmd.Wait(); err != nil {
    102 		panic(err)
    103 	}
    104 
    105 	output.WriteString(trailer)
    106 }
    107 
    108 const preamble = `# Copyright (c) 2014, Google Inc.
    109 #
    110 # Permission to use, copy, modify, and/or distribute this software for any
    111 # purpose with or without fee is hereby granted, provided that the above
    112 # copyright notice and this permission notice appear in all copies.
    113 #
    114 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    115 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    116 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
    117 # SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    118 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
    119 # OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
    120 # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    121 
    122 # This file contains a pre-compiled version of chacha_vec.c for ARM. This is
    123 # needed to support switching on NEON code at runtime. If the whole of OpenSSL
    124 # were to be compiled with the needed flags to build chacha_vec.c, then it
    125 # wouldn't be possible to run on non-NEON systems.
    126 #
    127 # This file was generated by chacha_vec_arm_generate.go using the following
    128 # compiler command:
    129 #
    130 #     `
    131 
    132 const attr28Block = `
    133 # EABI attribute 28 sets whether VFP register arguments were used to build this
    134 # file. If object files are inconsistent on this point, the linker will refuse
    135 # to link them. Thus we report whatever the compiler expects since we don't use
    136 # VFP arguments.
    137 
    138 #if defined(__ARM_PCS_VFP)
    139 	.eabi_attribute 28, 1
    140 #else
    141 	.eabi_attribute 28, 0
    142 #endif
    143 
    144 `
    145 
    146 const trailer = `
    147 #endif  /* !OPENSSL_NO_ASM */
    148 `
    149