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/*
* mono-hwcap-arm.c: ARM hardware feature detection
*
* Authors:
* Alex Rønne Petersen (alexrp@xamarin.com)
* Elijah Taylor (elijahtaylor@google.com)
* Miguel de Icaza (miguel@xamarin.com)
* Neale Ferguson (Neale.Ferguson@SoftwareAG-usa.com)
* Paolo Molaro (lupus@xamarin.com)
* Rodrigo Kumpera (kumpera@gmail.com)
* Sebastien Pouliot (sebastien@xamarin.com)
* Zoltan Varga (vargaz@xamarin.com)
*
* Copyright 2003 Ximian, Inc.
* Copyright 2003-2011 Novell, Inc
* Copyright 2006 Broadcom
* Copyright 2007-2008 Andreas Faerber
* Copyright 2011-2013 Xamarin Inc
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
#include "mono/utils/mono-hwcap-arm.h"
#if defined(HAVE_SYS_AUXV_H) && !defined(PLATFORM_ANDROID)
#include <sys/auxv.h>
#elif defined(__APPLE__)
#include <mach/machine.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#else
#if defined (HAVE_SYS_UTSNAME_H)
#include <sys/utsname.h>
#endif
#include <stdio.h>
#endif
gboolean mono_hwcap_arm_is_v5 = FALSE;
gboolean mono_hwcap_arm_is_v6 = FALSE;
gboolean mono_hwcap_arm_is_v7 = FALSE;
gboolean mono_hwcap_arm_has_vfp = FALSE;
gboolean mono_hwcap_arm_has_vfp3 = FALSE;
gboolean mono_hwcap_arm_has_vfp3_d16 = FALSE;
gboolean mono_hwcap_arm_has_thumb = FALSE;
gboolean mono_hwcap_arm_has_thumb2 = FALSE;
void
mono_hwcap_arch_init (void)
{
#if defined(HAVE_SYS_AUXV_H) && !defined(PLATFORM_ANDROID)
unsigned long hwcap;
unsigned long platform;
if ((hwcap = getauxval(AT_HWCAP))) {
/* HWCAP_ARM_THUMB */
if (hwcap & 0x00000004)
mono_hwcap_arm_has_thumb = TRUE;
/* HWCAP_ARM_VFP */
if (hwcap & 0x00000040)
mono_hwcap_arm_has_vfp = TRUE;
/* HWCAP_ARM_VFPv3 */
if (hwcap & 0x00002000)
mono_hwcap_arm_has_vfp3 = TRUE;
/* HWCAP_ARM_VFPv3D16 */
if (hwcap & 0x00004000)
mono_hwcap_arm_has_vfp3_d16 = TRUE;
/* TODO: Find a way to detect Thumb 2. */
}
if ((platform = getauxval(AT_PLATFORM))) {
const char *str = (const char *) platform;
if (str [1] >= '5')
mono_hwcap_arm_is_v5 = TRUE;
if (str [1] >= '6')
mono_hwcap_arm_is_v6 = TRUE;
if (str [1] >= '7')
mono_hwcap_arm_is_v7 = TRUE;
/* TODO: Find a way to detect v7s. */
}
#elif defined(__APPLE__)
cpu_subtype_t sub_type;
size_t length = sizeof (sub_type);
sysctlbyname ("hw.cpusubtype", &sub_type, &length, NULL, 0);
if (sub_type == CPU_SUBTYPE_ARM_V5TEJ || sub_type == CPU_SUBTYPE_ARM_XSCALE) {
mono_hwcap_arm_is_v5 = TRUE;
} else if (sub_type == CPU_SUBTYPE_ARM_V6) {
mono_hwcap_arm_is_v5 = TRUE;
mono_hwcap_arm_is_v6 = TRUE;
} else if (sub_type == CPU_SUBTYPE_ARM_V7 || sub_type == CPU_SUBTYPE_ARM_V7F || sub_type == CPU_SUBTYPE_ARM_V7K) {
mono_hwcap_arm_is_v5 = TRUE;
mono_hwcap_arm_is_v6 = TRUE;
mono_hwcap_arm_is_v7 = TRUE;
}
/* TODO: Find a way to detect features like Thumb and VFP. */
#else
/* We can't use the auxiliary vector on Android due to
* permissions, so fall back to /proc/cpuinfo. We also
* hit this path if the target doesn't have sys/auxv.h.
*/
#if defined (HAVE_SYS_UTSNAME_H)
struct utsname name;
/* Only fails if `name` is invalid (it isn't). */
g_assert (!uname (&name));
if (!strncmp (name.machine, "aarch64", 7) || !strncmp (name.machine, "armv8", 5)) {
/*
* We're a 32-bit program running on an ARMv8 system.
* Whether the system is actually 32-bit or 64-bit
* doesn't matter to us. The important thing is that
* all 3 of ARMv8's execution states (A64, A32, T32)
* are guaranteed to have all of the features that
* we want to detect and use.
*
* We do this ARMv8 detection via uname () because
* in the early days of ARMv8 on Linux, the
* /proc/cpuinfo format was a disaster and there
* were multiple (merged into mainline) attempts at
* cleaning it up (read: breaking applications that
* tried to rely on it). So now multiple ARMv8
* systems in the wild have different /proc/cpuinfo
* output, some of which are downright useless.
*
* So, when it comes to detecting ARMv8 in a 32-bit
* program, it's better to just avoid /proc/cpuinfo
* entirely. Maybe in a decade or two, we won't
* have to worry about this mess that the Linux ARM
* maintainers created. One can hope.
*/
mono_hwcap_arm_is_v5 = TRUE;
mono_hwcap_arm_is_v6 = TRUE;
mono_hwcap_arm_is_v7 = TRUE;
mono_hwcap_arm_has_vfp = TRUE;
mono_hwcap_arm_has_vfp3 = TRUE;
mono_hwcap_arm_has_vfp3_d16 = TRUE;
mono_hwcap_arm_has_thumb = TRUE;
mono_hwcap_arm_has_thumb2 = TRUE;
}
#endif
char buf [512];
char *line;
FILE *file = fopen ("/proc/cpuinfo", "r");
if (file) {
while ((line = fgets (buf, 512, file))) {
if (!strncmp (line, "Processor", 9)) {
char *ver = strstr (line, "(v");
if (ver) {
if (ver [2] >= '5')
mono_hwcap_arm_is_v5 = TRUE;
if (ver [2] >= '6')
mono_hwcap_arm_is_v6 = TRUE;
if (ver [2] >= '7')
mono_hwcap_arm_is_v7 = TRUE;
/* TODO: Find a way to detect v7s. */
}
continue;
}
if (!strncmp (line, "Features", 8)) {
if (strstr (line, "thumb"))
mono_hwcap_arm_has_thumb = TRUE;
/* TODO: Find a way to detect Thumb 2. */
if (strstr (line, "vfp"))
mono_hwcap_arm_has_vfp = TRUE;
if (strstr (line, "vfpv3"))
mono_hwcap_arm_has_vfp3 = TRUE;
if (strstr (line, "vfpv3-d16"))
mono_hwcap_arm_has_vfp3_d16 = TRUE;
continue;
}
}
fclose (file);
}
#endif
}
void
mono_hwcap_print(FILE *f)
{
g_fprintf (f, "mono_hwcap_arm_is_v5 = %i\n", mono_hwcap_arm_is_v5);
g_fprintf (f, "mono_hwcap_arm_is_v6 = %i\n", mono_hwcap_arm_is_v6);
g_fprintf (f, "mono_hwcap_arm_is_v7 = %i\n", mono_hwcap_arm_is_v7);
g_fprintf (f, "mono_hwcap_arm_has_vfp = %i\n", mono_hwcap_arm_has_vfp);
g_fprintf (f, "mono_hwcap_arm_has_vfp3 = %i\n", mono_hwcap_arm_has_vfp3);
g_fprintf (f, "mono_hwcap_arm_has_vfp3_d16 = %i\n", mono_hwcap_arm_has_vfp3_d16);
g_fprintf (f, "mono_hwcap_arm_has_thumb = %i\n", mono_hwcap_arm_has_thumb);
g_fprintf (f, "mono_hwcap_arm_has_thumb2 = %i\n", mono_hwcap_arm_has_thumb2);
}
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