blob: 82aa847f9607d18e54e93816c1c42e080d5e393c [file] [log] [blame]
// Copyright (c) 2014, Google Inc.
//
// Permission to use, copy, modify, and/or 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.
// This package generates chacha_vec_arm.S from chacha_vec.c. Install the
// arm-linux-gnueabihf-gcc compiler as described in BUILDING.md. Then:
// `(cd crypto/chacha && go run chacha_vec_arm_generate.go)`.
package main
import (
"bufio"
"bytes"
"os"
"os/exec"
"strings"
)
const defaultCompiler = "/opt/gcc-linaro-4.9-2014.11-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc"
func main() {
compiler := defaultCompiler
if len(os.Args) > 1 {
compiler = os.Args[1]
}
args := []string{
"-O3",
"-mcpu=cortex-a8",
"-mfpu=neon",
"-fpic",
"-DASM_GEN",
"-I", "../../include",
"-S", "chacha_vec.c",
"-o", "-",
}
output, err := os.OpenFile("chacha_vec_arm.S", os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
if err != nil {
panic(err)
}
defer output.Close()
output.WriteString(preamble)
output.WriteString(compiler)
output.WriteString(" ")
output.WriteString(strings.Join(args, " "))
output.WriteString("\n\n#if !defined(OPENSSL_NO_ASM)\n")
output.WriteString("#if defined(__arm__)\n\n")
cmd := exec.Command(compiler, args...)
cmd.Stderr = os.Stderr
asm, err := cmd.StdoutPipe()
if err != nil {
panic(err)
}
if err := cmd.Start(); err != nil {
panic(err)
}
attr28 := []byte(".eabi_attribute 28,")
globalDirective := []byte(".global\t")
newLine := []byte("\n")
attr28Handled := false
scanner := bufio.NewScanner(asm)
for scanner.Scan() {
line := scanner.Bytes()
if bytes.Contains(line, attr28) {
output.WriteString(attr28Block)
attr28Handled = true
continue
}
output.Write(line)
output.Write(newLine)
if i := bytes.Index(line, globalDirective); i >= 0 {
output.Write(line[:i])
output.WriteString(".hidden\t")
output.Write(line[i+len(globalDirective):])
output.Write(newLine)
}
}
if err := scanner.Err(); err != nil {
panic(err)
}
if !attr28Handled {
panic("EABI attribute 28 not seen in processing")
}
if err := cmd.Wait(); err != nil {
panic(err)
}
output.WriteString(trailer)
}
const preamble = `# Copyright (c) 2014, Google Inc.
#
# Permission to use, copy, modify, and/or 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.
# This file contains a pre-compiled version of chacha_vec.c for ARM. This is
# needed to support switching on NEON code at runtime. If the whole of OpenSSL
# were to be compiled with the needed flags to build chacha_vec.c, then it
# wouldn't be possible to run on non-NEON systems.
#
# This file was generated by chacha_vec_arm_generate.go using the following
# compiler command:
#
# `
const attr28Block = `
# EABI attribute 28 sets whether VFP register arguments were used to build this
# file. If object files are inconsistent on this point, the linker will refuse
# to link them. Thus we report whatever the compiler expects since we don't use
# VFP arguments.
#if defined(__ARM_PCS_VFP)
.eabi_attribute 28, 1
#else
.eabi_attribute 28, 0
#endif
`
const trailer = `
#endif /* __arm__ */
#endif /* !OPENSSL_NO_ASM */
`