forked from Imagelibrary/rtems
146adb1edf
The SPARC ABI is a bit special with respect to the floating point context. The complete floating point context is volatile. Thus, from an ABI point of view nothing needs to be saved and restored during a context switch. Instead the floating point context must be saved and restored during interrupt processing. Historically, the deferred floating point switch was used for SPARC and the complete floating point context is saved and restored during a context switch to the new floating point unit owner. This is a bit dangerous since post-switch actions (e.g. signal handlers) and context switch extensions may silently corrupt the floating point context. The floating point unit is disabled for interrupt handlers. Thus, in case an interrupt handler uses the floating point unit then this will result in a trap (INTERNAL_ERROR_ILLEGAL_USE_OF_FLOATING_POINT_UNIT). In uniprocessor configurations, a lazy floating point context switch is used. In case an active floating point thread is interrupted (PSR[EF] == 1) and a thread dispatch is carried out, then this thread is registered as the floating point owner. When a floating point owner is present during a context switch, the floating point unit is disabled for the heir thread (PSR[EF] == 0). The floating point disabled trap checks that the use of the floating point unit is allowed and saves/restores the floating point context on demand. Update #3077.
82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
/*
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* Copyright (c) 2017 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#define TESTS_USE_PRINTK
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#include "tmacros.h"
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#include <rtems.h>
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const char rtems_test_name[] = "SPFATAL 30";
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#if (CPU_HARDWARE_FP == TRUE && CPU_ALL_TASKS_ARE_FP == FALSE) \
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|| SPARC_HAS_FPU == 1
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#define EXPECT_ILLEGAL_USE_OF_FLOATING_POINT_UNIT
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#endif
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static volatile double f = 1.0;
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static void Init(rtems_task_argument arg)
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{
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TEST_BEGIN();
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f *= 123.456;
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#ifdef EXPECT_ILLEGAL_USE_OF_FLOATING_POINT_UNIT
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rtems_test_assert(0);
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#else
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TEST_END();
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rtems_test_exit(0);
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#endif
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}
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#ifdef EXPECT_ILLEGAL_USE_OF_FLOATING_POINT_UNIT
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static void fatal_extension(
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rtems_fatal_source source,
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bool always_set_to_false,
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rtems_fatal_code code
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)
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{
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if (
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source == INTERNAL_ERROR_CORE
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&& !always_set_to_false
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&& code == INTERNAL_ERROR_ILLEGAL_USE_OF_FLOATING_POINT_UNIT
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) {
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TEST_END();
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}
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}
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#define CONFIGURE_INITIAL_EXTENSIONS \
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{ .fatal = fatal_extension }, \
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RTEMS_TEST_INITIAL_EXTENSION
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#else /* EXPECT_ILLEGAL_USE_OF_FLOATING_POINT_UNIT */
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#define CONFIGURE_INITIAL_EXTENSIONS RTEMS_TEST_INITIAL_EXTENSION
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#endif /* EXPECT_ILLEGAL_USE_OF_FLOATING_POINT_UNIT */
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#define CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER
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#define CONFIGURE_MAXIMUM_TASKS 1
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#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
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#define CONFIGURE_INIT
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#include <rtems/confdefs.h>
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