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gfx/cairo/libpixman/src/pixman-ppc.c@b8a032363ba2 (annotated)

gfx/cairo/libpixman/src/pixman-ppc.c

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/*
michael@0	2	* Copyright © 2000 SuSE, Inc.
michael@0	3	* Copyright © 2007 Red Hat, Inc.
michael@0	4	*
michael@0	5	* Permission to use, copy, modify, distribute, and sell this software and its
michael@0	6	* documentation for any purpose is hereby granted without fee, provided that
michael@0	7	* the above copyright notice appear in all copies and that both that
michael@0	8	* copyright notice and this permission notice appear in supporting
michael@0	9	* documentation, and that the name of SuSE not be used in advertising or
michael@0	10	* publicity pertaining to distribution of the software without specific,
michael@0	11	* written prior permission. SuSE makes no representations about the
michael@0	12	* suitability of this software for any purpose. It is provided "as is"
michael@0	13	* without express or implied warranty.
michael@0	14	*
michael@0	15	* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
michael@0	16	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
michael@0	17	* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
michael@0	18	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
michael@0	19	* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
michael@0	20	* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
michael@0	21	*/
michael@0	22	#ifdef HAVE_CONFIG_H
michael@0	23	#include <config.h>
michael@0	24	#endif
michael@0	25
michael@0	26	#include "pixman-private.h"
michael@0	27
michael@0	28	#ifdef USE_VMX
michael@0	29
michael@0	30	/* The CPU detection code needs to be in a file not compiled with
michael@0	31	* "-maltivec -mabi=altivec", as gcc would try to save vector register
michael@0	32	* across function calls causing SIGILL on cpus without Altivec/vmx.
michael@0	33	*/
michael@0	34	#ifdef __APPLE__
michael@0	35	#include <sys/sysctl.h>
michael@0	36
michael@0	37	static pixman_bool_t
michael@0	38	pixman_have_vmx (void)
michael@0	39	{
michael@0	40	int error, have_vmx;
michael@0	41	size_t length = sizeof(have_vmx);
michael@0	42
michael@0	43	error = sysctlbyname ("hw.optional.altivec", &have_vmx, &length, NULL, 0);
michael@0	44
michael@0	45	if (error)
michael@0	46	return FALSE;
michael@0	47
michael@0	48	return have_vmx;
michael@0	49	}
michael@0	50
michael@0	51	#elif defined (__OpenBSD__)
michael@0	52	#include <sys/param.h>
michael@0	53	#include <sys/sysctl.h>
michael@0	54	#include <machine/cpu.h>
michael@0	55
michael@0	56	static pixman_bool_t
michael@0	57	pixman_have_vmx (void)
michael@0	58	{
michael@0	59	int error, have_vmx;
michael@0	60	int mib[2] = { CTL_MACHDEP, CPU_ALTIVEC };
michael@0	61	size_t length = sizeof(have_vmx);
michael@0	62
michael@0	63	error = sysctl (mib, 2, &have_vmx, &length, NULL, 0);
michael@0	64
michael@0	65	if (error != 0)
michael@0	66	return FALSE;
michael@0	67
michael@0	68	return have_vmx;
michael@0	69	}
michael@0	70
michael@0	71	#elif defined (__linux__)
michael@0	72
michael@0	73	#include <sys/types.h>
michael@0	74	#include <sys/stat.h>
michael@0	75	#include <fcntl.h>
michael@0	76	#include <unistd.h>
michael@0	77	#include <stdio.h>
michael@0	78	#include <linux/auxvec.h>
michael@0	79	#include <asm/cputable.h>
michael@0	80
michael@0	81	static pixman_bool_t
michael@0	82	pixman_have_vmx (void)
michael@0	83	{
michael@0	84	int have_vmx = FALSE;
michael@0	85	int fd;
michael@0	86	struct
michael@0	87	{
michael@0	88	unsigned long type;
michael@0	89	unsigned long value;
michael@0	90	} aux;
michael@0	91
michael@0	92	fd = open ("/proc/self/auxv", O_RDONLY);
michael@0	93	if (fd >= 0)
michael@0	94	{
michael@0	95	while (read (fd, &aux, sizeof (aux)) == sizeof (aux))
michael@0	96	{
michael@0	97	if (aux.type == AT_HWCAP && (aux.value & PPC_FEATURE_HAS_ALTIVEC))
michael@0	98	{
michael@0	99	have_vmx = TRUE;
michael@0	100	break;
michael@0	101	}
michael@0	102	}
michael@0	103
michael@0	104	close (fd);
michael@0	105	}
michael@0	106
michael@0	107	return have_vmx;
michael@0	108	}
michael@0	109
michael@0	110	#else /* !__APPLE__ && !__OpenBSD__ && !__linux__ */
michael@0	111	#include <signal.h>
michael@0	112	#include <setjmp.h>
michael@0	113
michael@0	114	static jmp_buf jump_env;
michael@0	115
michael@0	116	static void
michael@0	117	vmx_test (int sig,
michael@0	118	siginfo_t *si,
michael@0	119	void * unused)
michael@0	120	{
michael@0	121	longjmp (jump_env, 1);
michael@0	122	}
michael@0	123
michael@0	124	static pixman_bool_t
michael@0	125	pixman_have_vmx (void)
michael@0	126	{
michael@0	127	struct sigaction sa, osa;
michael@0	128	int jmp_result;
michael@0	129
michael@0	130	sa.sa_flags = SA_SIGINFO;
michael@0	131	sigemptyset (&sa.sa_mask);
michael@0	132	sa.sa_sigaction = vmx_test;
michael@0	133	sigaction (SIGILL, &sa, &osa);
michael@0	134	jmp_result = setjmp (jump_env);
michael@0	135	if (jmp_result == 0)
michael@0	136	{
michael@0	137	asm volatile ( "vor 0, 0, 0" );
michael@0	138	}
michael@0	139	sigaction (SIGILL, &osa, NULL);
michael@0	140	return (jmp_result == 0);
michael@0	141	}
michael@0	142
michael@0	143	#endif /* __APPLE__ */
michael@0	144	#endif /* USE_VMX */
michael@0	145
michael@0	146	pixman_implementation_t *
michael@0	147	_pixman_ppc_get_implementations (pixman_implementation_t *imp)
michael@0	148	{
michael@0	149	#ifdef USE_VMX
michael@0	150	if (!_pixman_disabled ("vmx") && pixman_have_vmx ())
michael@0	151	imp = _pixman_implementation_create_vmx (imp);
michael@0	152	#endif
michael@0	153
michael@0	154	return imp;
michael@0	155	}