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2e56925c36
installation, not the bundled copies which might not match what is installed. - Upgraded bundled FLAC from version 1.1.2 to version 1.2.1. SVN r575 (trunk)
418 lines
15 KiB
C
418 lines
15 KiB
C
/* libFLAC - Free Lossless Audio Codec library
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* Copyright (C) 2001,2002,2003,2004,2005,2006,2007 Josh Coalson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of the Xiph.org Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "private/cpu.h"
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#include <stdlib.h>
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#include <stdio.h>
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#if defined FLAC__CPU_IA32
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# include <signal.h>
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#elif defined FLAC__CPU_PPC
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# if !defined FLAC__NO_ASM
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# if defined FLAC__SYS_DARWIN
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# include <sys/sysctl.h>
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# include <mach/mach.h>
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# include <mach/mach_host.h>
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# include <mach/host_info.h>
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# include <mach/machine.h>
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# ifndef CPU_SUBTYPE_POWERPC_970
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# define CPU_SUBTYPE_POWERPC_970 ((cpu_subtype_t) 100)
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# endif
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# else /* FLAC__SYS_DARWIN */
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# include <signal.h>
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# include <setjmp.h>
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static sigjmp_buf jmpbuf;
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static volatile sig_atomic_t canjump = 0;
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static void sigill_handler (int sig)
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{
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if (!canjump) {
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signal (sig, SIG_DFL);
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raise (sig);
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}
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canjump = 0;
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siglongjmp (jmpbuf, 1);
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}
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# endif /* FLAC__SYS_DARWIN */
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# endif /* FLAC__NO_ASM */
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#endif /* FLAC__CPU_PPC */
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#if defined (__NetBSD__) || defined(__OpenBSD__)
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <machine/cpu.h>
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#endif
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#endif
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#if defined(__APPLE__)
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/* how to get sysctlbyname()? */
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#endif
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/* these are flags in EDX of CPUID AX=00000001 */
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static const unsigned FLAC__CPUINFO_IA32_CPUID_CMOV = 0x00008000;
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static const unsigned FLAC__CPUINFO_IA32_CPUID_MMX = 0x00800000;
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static const unsigned FLAC__CPUINFO_IA32_CPUID_FXSR = 0x01000000;
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static const unsigned FLAC__CPUINFO_IA32_CPUID_SSE = 0x02000000;
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static const unsigned FLAC__CPUINFO_IA32_CPUID_SSE2 = 0x04000000;
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/* these are flags in ECX of CPUID AX=00000001 */
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static const unsigned FLAC__CPUINFO_IA32_CPUID_SSE3 = 0x00000001;
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static const unsigned FLAC__CPUINFO_IA32_CPUID_SSSE3 = 0x00000200;
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/* these are flags in EDX of CPUID AX=80000001 */
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static const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_3DNOW = 0x80000000;
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static const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXT3DNOW = 0x40000000;
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static const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXTMMX = 0x00400000;
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/*
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* Extra stuff needed for detection of OS support for SSE on IA-32
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*/
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#if defined(FLAC__CPU_IA32) && !defined FLAC__NO_ASM && defined FLAC__HAS_NASM && !defined FLAC__NO_SSE_OS && !defined FLAC__SSE_OS
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# if defined(__linux__)
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/*
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* If the OS doesn't support SSE, we will get here with a SIGILL. We
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* modify the return address to jump over the offending SSE instruction
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* and also the operation following it that indicates the instruction
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* executed successfully. In this way we use no global variables and
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* stay thread-safe.
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*
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* 3 + 3 + 6:
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* 3 bytes for "xorps xmm0,xmm0"
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* 3 bytes for estimate of how long the follwing "inc var" instruction is
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* 6 bytes extra in case our estimate is wrong
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* 12 bytes puts us in the NOP "landing zone"
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*/
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# undef USE_OBSOLETE_SIGCONTEXT_FLAVOR /* #define this to use the older signal handler method */
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# ifdef USE_OBSOLETE_SIGCONTEXT_FLAVOR
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static void sigill_handler_sse_os(int signal, struct sigcontext sc)
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{
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(void)signal;
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sc.eip += 3 + 3 + 6;
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}
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# else
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# include <sys/ucontext.h>
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static void sigill_handler_sse_os(int signal, siginfo_t *si, void *uc)
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{
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(void)signal, (void)si;
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((ucontext_t*)uc)->uc_mcontext.gregs[14/*REG_EIP*/] += 3 + 3 + 6;
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}
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# endif
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# elif defined(_MSC_VER)
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# include <windows.h>
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# undef USE_TRY_CATCH_FLAVOR /* #define this to use the try/catch method for catching illegal opcode exception */
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# ifdef USE_TRY_CATCH_FLAVOR
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# else
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LONG CALLBACK sigill_handler_sse_os(EXCEPTION_POINTERS *ep)
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{
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if(ep->ExceptionRecord->ExceptionCode == EXCEPTION_ILLEGAL_INSTRUCTION) {
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ep->ContextRecord->Eip += 3 + 3 + 6;
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return EXCEPTION_CONTINUE_EXECUTION;
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}
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return EXCEPTION_CONTINUE_SEARCH;
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}
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# endif
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# endif
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#endif
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void FLAC__cpu_info(FLAC__CPUInfo *info)
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{
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/*
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* IA32-specific
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*/
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#ifdef FLAC__CPU_IA32
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info->type = FLAC__CPUINFO_TYPE_IA32;
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#if !defined FLAC__NO_ASM && defined FLAC__HAS_NASM
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info->use_asm = true; /* we assume a minimum of 80386 with FLAC__CPU_IA32 */
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info->data.ia32.cpuid = FLAC__cpu_have_cpuid_asm_ia32()? true : false;
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info->data.ia32.bswap = info->data.ia32.cpuid; /* CPUID => BSWAP since it came after */
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info->data.ia32.cmov = false;
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info->data.ia32.mmx = false;
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info->data.ia32.fxsr = false;
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info->data.ia32.sse = false;
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info->data.ia32.sse2 = false;
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info->data.ia32.sse3 = false;
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info->data.ia32.ssse3 = false;
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info->data.ia32._3dnow = false;
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info->data.ia32.ext3dnow = false;
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info->data.ia32.extmmx = false;
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if(info->data.ia32.cpuid) {
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/* http://www.sandpile.org/ia32/cpuid.htm */
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FLAC__uint32 flags_edx, flags_ecx;
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FLAC__cpu_info_asm_ia32(&flags_edx, &flags_ecx);
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info->data.ia32.cmov = (flags_edx & FLAC__CPUINFO_IA32_CPUID_CMOV )? true : false;
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info->data.ia32.mmx = (flags_edx & FLAC__CPUINFO_IA32_CPUID_MMX )? true : false;
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info->data.ia32.fxsr = (flags_edx & FLAC__CPUINFO_IA32_CPUID_FXSR )? true : false;
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info->data.ia32.sse = (flags_edx & FLAC__CPUINFO_IA32_CPUID_SSE )? true : false;
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info->data.ia32.sse2 = (flags_edx & FLAC__CPUINFO_IA32_CPUID_SSE2 )? true : false;
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info->data.ia32.sse3 = (flags_ecx & FLAC__CPUINFO_IA32_CPUID_SSE3 )? true : false;
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info->data.ia32.ssse3 = (flags_ecx & FLAC__CPUINFO_IA32_CPUID_SSSE3)? true : false;
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#ifdef FLAC__USE_3DNOW
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flags_edx = FLAC__cpu_info_extended_amd_asm_ia32();
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info->data.ia32._3dnow = (flags_edx & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_3DNOW )? true : false;
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info->data.ia32.ext3dnow = (flags_edx & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXT3DNOW)? true : false;
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info->data.ia32.extmmx = (flags_edx & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXTMMX )? true : false;
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#else
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info->data.ia32._3dnow = info->data.ia32.ext3dnow = info->data.ia32.extmmx = false;
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#endif
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#ifdef DEBUG
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fprintf(stderr, "CPU info (IA-32):\n");
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fprintf(stderr, " CPUID ...... %c\n", info->data.ia32.cpuid ? 'Y' : 'n');
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fprintf(stderr, " BSWAP ...... %c\n", info->data.ia32.bswap ? 'Y' : 'n');
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fprintf(stderr, " CMOV ....... %c\n", info->data.ia32.cmov ? 'Y' : 'n');
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fprintf(stderr, " MMX ........ %c\n", info->data.ia32.mmx ? 'Y' : 'n');
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fprintf(stderr, " FXSR ....... %c\n", info->data.ia32.fxsr ? 'Y' : 'n');
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fprintf(stderr, " SSE ........ %c\n", info->data.ia32.sse ? 'Y' : 'n');
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fprintf(stderr, " SSE2 ....... %c\n", info->data.ia32.sse2 ? 'Y' : 'n');
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fprintf(stderr, " SSE3 ....... %c\n", info->data.ia32.sse3 ? 'Y' : 'n');
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fprintf(stderr, " SSSE3 ...... %c\n", info->data.ia32.ssse3 ? 'Y' : 'n');
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fprintf(stderr, " 3DNow! ..... %c\n", info->data.ia32._3dnow ? 'Y' : 'n');
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fprintf(stderr, " 3DNow!-ext . %c\n", info->data.ia32.ext3dnow? 'Y' : 'n');
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fprintf(stderr, " 3DNow!-MMX . %c\n", info->data.ia32.extmmx ? 'Y' : 'n');
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#endif
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/*
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* now have to check for OS support of SSE/SSE2
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*/
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if(info->data.ia32.fxsr || info->data.ia32.sse || info->data.ia32.sse2) {
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#if defined FLAC__NO_SSE_OS
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/* assume user knows better than us; turn it off */
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info->data.ia32.fxsr = info->data.ia32.sse = info->data.ia32.sse2 = info->data.ia32.sse3 = info->data.ia32.ssse3 = false;
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#elif defined FLAC__SSE_OS
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/* assume user knows better than us; leave as detected above */
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#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) || defined(__APPLE__)
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int sse = 0;
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size_t len;
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/* at least one of these must work: */
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len = sizeof(sse); sse = sse || (sysctlbyname("hw.instruction_sse", &sse, &len, NULL, 0) == 0 && sse);
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len = sizeof(sse); sse = sse || (sysctlbyname("hw.optional.sse" , &sse, &len, NULL, 0) == 0 && sse); /* __APPLE__ ? */
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if(!sse)
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info->data.ia32.fxsr = info->data.ia32.sse = info->data.ia32.sse2 = info->data.ia32.sse3 = info->data.ia32.ssse3 = false;
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#elif defined(__NetBSD__) || defined (__OpenBSD__)
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# if __NetBSD_Version__ >= 105250000 || (defined __OpenBSD__)
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int val = 0, mib[2] = { CTL_MACHDEP, CPU_SSE };
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size_t len = sizeof(val);
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if(sysctl(mib, 2, &val, &len, NULL, 0) < 0 || !val)
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info->data.ia32.fxsr = info->data.ia32.sse = info->data.ia32.sse2 = info->data.ia32.sse3 = info->data.ia32.ssse3 = false;
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else { /* double-check SSE2 */
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mib[1] = CPU_SSE2;
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len = sizeof(val);
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if(sysctl(mib, 2, &val, &len, NULL, 0) < 0 || !val)
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info->data.ia32.sse2 = info->data.ia32.sse3 = info->data.ia32.ssse3 = false;
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}
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# else
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info->data.ia32.fxsr = info->data.ia32.sse = info->data.ia32.sse2 = info->data.ia32.sse3 = info->data.ia32.ssse3 = false;
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# endif
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#elif defined(__linux__)
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int sse = 0;
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struct sigaction sigill_save;
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#ifdef USE_OBSOLETE_SIGCONTEXT_FLAVOR
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if(0 == sigaction(SIGILL, NULL, &sigill_save) && signal(SIGILL, (void (*)(int))sigill_handler_sse_os) != SIG_ERR)
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#else
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struct sigaction sigill_sse;
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sigill_sse.sa_sigaction = sigill_handler_sse_os;
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__sigemptyset(&sigill_sse.sa_mask);
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sigill_sse.sa_flags = SA_SIGINFO | SA_RESETHAND; /* SA_RESETHAND just in case our SIGILL return jump breaks, so we don't get stuck in a loop */
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if(0 == sigaction(SIGILL, &sigill_sse, &sigill_save))
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#endif
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{
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/* http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html */
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/* see sigill_handler_sse_os() for an explanation of the following: */
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asm volatile (
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"xorl %0,%0\n\t" /* for some reason, still need to do this to clear 'sse' var */
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"xorps %%xmm0,%%xmm0\n\t" /* will cause SIGILL if unsupported by OS */
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"incl %0\n\t" /* SIGILL handler will jump over this */
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/* landing zone */
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"nop\n\t" /* SIGILL jump lands here if "inc" is 9 bytes */
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t" /* SIGILL jump lands here if "inc" is 3 bytes (expected) */
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"nop\n\t"
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"nop" /* SIGILL jump lands here if "inc" is 1 byte */
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: "=r"(sse)
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: "r"(sse)
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);
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sigaction(SIGILL, &sigill_save, NULL);
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}
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if(!sse)
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info->data.ia32.fxsr = info->data.ia32.sse = info->data.ia32.sse2 = info->data.ia32.sse3 = info->data.ia32.ssse3 = false;
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#elif defined(_MSC_VER)
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# ifdef USE_TRY_CATCH_FLAVOR
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_try {
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__asm {
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# if _MSC_VER <= 1200
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/* VC6 assembler doesn't know SSE, have to emit bytecode instead */
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_emit 0x0F
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_emit 0x57
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_emit 0xC0
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# else
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xorps xmm0,xmm0
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# endif
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}
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}
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_except(EXCEPTION_EXECUTE_HANDLER) {
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if (_exception_code() == STATUS_ILLEGAL_INSTRUCTION)
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info->data.ia32.fxsr = info->data.ia32.sse = info->data.ia32.sse2 = info->data.ia32.sse3 = info->data.ia32.ssse3 = false;
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}
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# else
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int sse = 0;
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LPTOP_LEVEL_EXCEPTION_FILTER save = SetUnhandledExceptionFilter(sigill_handler_sse_os);
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/* see GCC version above for explanation */
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/* http://msdn2.microsoft.com/en-us/library/4ks26t93.aspx */
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/* http://www.codeproject.com/cpp/gccasm.asp */
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/* http://www.hick.org/~mmiller/msvc_inline_asm.html */
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__asm {
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# if _MSC_VER <= 1200
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/* VC6 assembler doesn't know SSE, have to emit bytecode instead */
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_emit 0x0F
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_emit 0x57
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_emit 0xC0
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# else
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xorps xmm0,xmm0
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# endif
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inc sse
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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}
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SetUnhandledExceptionFilter(save);
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if(!sse)
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info->data.ia32.fxsr = info->data.ia32.sse = info->data.ia32.sse2 = info->data.ia32.sse3 = info->data.ia32.ssse3 = false;
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# endif
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#else
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/* no way to test, disable to be safe */
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info->data.ia32.fxsr = info->data.ia32.sse = info->data.ia32.sse2 = info->data.ia32.sse3 = info->data.ia32.ssse3 = false;
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#endif
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#ifdef DEBUG
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fprintf(stderr, " SSE OS sup . %c\n", info->data.ia32.sse ? 'Y' : 'n');
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#endif
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}
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}
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#else
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info->use_asm = false;
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#endif
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/*
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* PPC-specific
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*/
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#elif defined FLAC__CPU_PPC
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info->type = FLAC__CPUINFO_TYPE_PPC;
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# if !defined FLAC__NO_ASM
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info->use_asm = true;
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# ifdef FLAC__USE_ALTIVEC
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# if defined FLAC__SYS_DARWIN
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{
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int val = 0, mib[2] = { CTL_HW, HW_VECTORUNIT };
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size_t len = sizeof(val);
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info->data.ppc.altivec = !(sysctl(mib, 2, &val, &len, NULL, 0) || !val);
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}
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{
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host_basic_info_data_t hostInfo;
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mach_msg_type_number_t infoCount;
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infoCount = HOST_BASIC_INFO_COUNT;
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host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&hostInfo, &infoCount);
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info->data.ppc.ppc64 = (hostInfo.cpu_type == CPU_TYPE_POWERPC) && (hostInfo.cpu_subtype == CPU_SUBTYPE_POWERPC_970);
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}
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# else /* FLAC__USE_ALTIVEC && !FLAC__SYS_DARWIN */
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{
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/* no Darwin, do it the brute-force way */
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/* @@@@@@ this is not thread-safe; replace with SSE OS method above or remove */
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info->data.ppc.altivec = 0;
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info->data.ppc.ppc64 = 0;
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signal (SIGILL, sigill_handler);
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canjump = 0;
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if (!sigsetjmp (jmpbuf, 1)) {
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canjump = 1;
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asm volatile (
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"mtspr 256, %0\n\t"
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"vand %%v0, %%v0, %%v0"
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:
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: "r" (-1)
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);
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info->data.ppc.altivec = 1;
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}
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canjump = 0;
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if (!sigsetjmp (jmpbuf, 1)) {
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int x = 0;
|
|
canjump = 1;
|
|
|
|
/* PPC64 hardware implements the cntlzd instruction */
|
|
asm volatile ("cntlzd %0, %1" : "=r" (x) : "r" (x) );
|
|
|
|
info->data.ppc.ppc64 = 1;
|
|
}
|
|
signal (SIGILL, SIG_DFL); /*@@@@@@ should save and restore old signal */
|
|
}
|
|
# endif
|
|
# else /* !FLAC__USE_ALTIVEC */
|
|
info->data.ppc.altivec = 0;
|
|
info->data.ppc.ppc64 = 0;
|
|
# endif
|
|
# else
|
|
info->use_asm = false;
|
|
# endif
|
|
|
|
/*
|
|
* unknown CPI
|
|
*/
|
|
#else
|
|
info->type = FLAC__CPUINFO_TYPE_UNKNOWN;
|
|
info->use_asm = false;
|
|
#endif
|
|
}
|