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/* hwf-ppc.c - Detect hardware features - PPC part
* Copyright (C) 2013,2019 Jussi Kivilinna <jussi.kivilinna@iki.fi>
* Copyright (C) 2019 Shawn Landden <shawn@git.icu>
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#if defined(HAVE_SYS_AUXV_H) && (defined(HAVE_GETAUXVAL) || \
defined(HAVE_ELF_AUX_INFO))
#include <sys/auxv.h>
#endif
#include "g10lib.h"
#include "hwf-common.h"
#if !defined (__powerpc__) && !defined (__powerpc64__)
# error Module build for wrong CPU.
#endif
#if defined(HAVE_SYS_AUXV_H) && defined(HAVE_ELF_AUX_INFO) && \
!defined(HAVE_GETAUXVAL) && defined(AT_HWCAP)
#define HAVE_GETAUXVAL
static unsigned long getauxval(unsigned long type)
{
unsigned long auxval = 0;
int err;
/* FreeBSD provides 'elf_aux_info' function that does the same as
* 'getauxval' on Linux. */
err = elf_aux_info (type, &auxval, sizeof(auxval));
if (err)
{
errno = err;
auxval = 0;
}
return auxval;
}
#endif
#undef HAS_SYS_AT_HWCAP
#if defined(__linux__) || \
(defined(HAVE_SYS_AUXV_H) && defined(HAVE_GETAUXVAL))
#define HAS_SYS_AT_HWCAP 1
struct feature_map_s
{
unsigned int hwcap_flag;
unsigned int hwcap2_flag;
unsigned int hwf_flag;
};
#if defined(__powerpc__) || defined(__powerpc64__)
/* Note: These macros have same values on Linux and FreeBSD. */
#ifndef AT_HWCAP
# define AT_HWCAP 16
#endif
#ifndef AT_HWCAP2
# define AT_HWCAP2 26
#endif
#ifndef PPC_FEATURE2_ARCH_2_07
# define PPC_FEATURE2_ARCH_2_07 0x80000000
#endif
#ifndef PPC_FEATURE2_VEC_CRYPTO
# define PPC_FEATURE2_VEC_CRYPTO 0x02000000
#endif
#ifndef PPC_FEATURE2_ARCH_3_00
# define PPC_FEATURE2_ARCH_3_00 0x00800000
#endif
static const struct feature_map_s ppc_features[] =
{
{ 0, PPC_FEATURE2_ARCH_2_07, HWF_PPC_ARCH_2_07 },
#ifdef ENABLE_PPC_CRYPTO_SUPPORT
{ 0, PPC_FEATURE2_VEC_CRYPTO, HWF_PPC_VCRYPTO },
#endif
{ 0, PPC_FEATURE2_ARCH_3_00, HWF_PPC_ARCH_3_00 },
};
#endif
static int
get_hwcap(unsigned int *hwcap, unsigned int *hwcap2)
{
struct { unsigned long a_type; unsigned long a_val; } auxv;
FILE *f;
int err = -1;
static int hwcap_initialized = 0;
static unsigned int stored_hwcap = 0;
static unsigned int stored_hwcap2 = 0;
if (hwcap_initialized)
{
*hwcap = stored_hwcap;
*hwcap2 = stored_hwcap2;
return 0;
}
#if 0 // TODO: configure.ac detection for __builtin_cpu_supports
// TODO: move to 'detect_ppc_builtin_cpu_supports'
#if defined(__GLIBC__) && defined(__GNUC__) && __GNUC__ >= 6
/* __builtin_cpu_supports returns 0 if glibc support doesn't exist, so
* we can only trust positive results. */
#ifdef ENABLE_PPC_CRYPTO_SUPPORT
if (__builtin_cpu_supports("vcrypto")) /* TODO: Configure.ac */
{
stored_hwcap2 |= PPC_FEATURE2_VEC_CRYPTO;
hwcap_initialized = 1;
}
#endif
if (__builtin_cpu_supports("arch_3_00")) /* TODO: Configure.ac */
{
stored_hwcap2 |= PPC_FEATURE2_ARCH_3_00;
hwcap_initialized = 1;
}
#endif
#endif
#if defined(HAVE_SYS_AUXV_H) && defined(HAVE_GETAUXVAL)
errno = 0;
auxv.a_val = getauxval (AT_HWCAP);
if (errno == 0)
{
stored_hwcap |= auxv.a_val;
hwcap_initialized = 1;
}
if (AT_HWCAP2 >= 0)
{
errno = 0;
auxv.a_val = getauxval (AT_HWCAP2);
if (errno == 0)
{
stored_hwcap2 |= auxv.a_val;
hwcap_initialized = 1;
}
}
if (hwcap_initialized && (stored_hwcap || stored_hwcap2))
{
*hwcap = stored_hwcap;
*hwcap2 = stored_hwcap2;
return 0;
}
#endif
f = fopen("/proc/self/auxv", "r");
if (!f)
{
*hwcap = stored_hwcap;
*hwcap2 = stored_hwcap2;
return -1;
}
while (fread(&auxv, sizeof(auxv), 1, f) > 0)
{
if (auxv.a_type == AT_HWCAP)
{
stored_hwcap |= auxv.a_val;
hwcap_initialized = 1;
}
if (auxv.a_type == AT_HWCAP2)
{
stored_hwcap2 |= auxv.a_val;
hwcap_initialized = 1;
}
}
if (hwcap_initialized)
err = 0;
fclose(f);
*hwcap = stored_hwcap;
*hwcap2 = stored_hwcap2;
return err;
}
static unsigned int
detect_ppc_at_hwcap(void)
{
unsigned int hwcap;
unsigned int hwcap2;
unsigned int features = 0;
unsigned int i;
if (get_hwcap(&hwcap, &hwcap2) < 0)
return features;
for (i = 0; i < DIM(ppc_features); i++)
{
if (hwcap & ppc_features[i].hwcap_flag)
features |= ppc_features[i].hwf_flag;
if (hwcap2 & ppc_features[i].hwcap2_flag)
features |= ppc_features[i].hwf_flag;
}
return features;
}
#endif
unsigned int
_gcry_hwf_detect_ppc (void)
{
unsigned int ret = 0;
unsigned int broken_hwfs = 0;
#if defined (HAS_SYS_AT_HWCAP)
ret |= detect_ppc_at_hwcap ();
#endif
ret &= ~broken_hwfs;
return ret;
}