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Diffstat (limited to 'ecos/packages/hal/cortexm/arch/current/include/hal_arch.inc')
| -rw-r--r-- | ecos/packages/hal/cortexm/arch/current/include/hal_arch.inc | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/ecos/packages/hal/cortexm/arch/current/include/hal_arch.inc b/ecos/packages/hal/cortexm/arch/current/include/hal_arch.inc new file mode 100644 index 0000000..bef2e52 --- /dev/null +++ b/ecos/packages/hal/cortexm/arch/current/include/hal_arch.inc @@ -0,0 +1,115 @@ +/*========================================================================== +// +// hal_arch.inc +// +// Cortex-M exception vector macros +// +//========================================================================== +// ####ECOSGPLCOPYRIGHTBEGIN#### +// ------------------------------------------- +// This file is part of eCos, the Embedded Configurable Operating System. +// Copyright (C) 2012 Free Software Foundation, Inc. +// +// eCos is free software; you can redistribute it and/or modify it under +// the terms of the GNU General Public License as published by the Free +// Software Foundation; either version 2 or (at your option) any later +// version. +// +// eCos 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 General Public License +// for more details. +// +// You should have received a copy of the GNU General Public License +// along with eCos; if not, write to the Free Software Foundation, Inc., +// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +// +// As a special exception, if other files instantiate templates or use +// macros or inline functions from this file, or you compile this file +// and link it with other works to produce a work based on this file, +// this file does not by itself cause the resulting work to be covered by +// the GNU General Public License. However the source code for this file +// must still be made available in accordance with section (3) of the GNU +// General Public License v2. +// +// This exception does not invalidate any other reasons why a work based +// on this file might be covered by the GNU General Public License. +// ------------------------------------------- +// ####ECOSGPLCOPYRIGHTEND#### +//========================================================================== +//#####DESCRIPTIONBEGIN#### +// +// Author(s): ilijak +// Contributors(s): +// Date: 2012-07-08 +// Description: This file defines some GAS macros exception VSRs. +// +//####DESCRIPTIONEND#### +// +//======================================================================== +*/ + +#ifdef CYGHWR_HAL_CORTEXM_FPU + +# ifdef CYGINT_HAL_FPV4_SP_D16 + +//============================================================================ +// LAZY context switching scheme keeps FPU disabled for the threads that +// don't use floating point. We need to enable it before we save FPU context +// in order to avoid Usage Fault exception. + + .macro hal_fpu_enable + ldr r1,=CYGARC_REG_FPU_CPACR + ldr r2,[r1] + stmdb r0!,{r2} // Save thread's CPACR state + orr r2,#CYGARC_REG_FPU_CPACR_ENABLE + str r2,[r1] + .endm + +//============================================================================ +// Restore thread's FPU usage state. +// undo hal_fpu_enable + + .macro hal_fpu_undo_enable + ldmia r0!,{r2} // Retrieve previous thread's CPACR state + ldr r1,=CYGARC_REG_FPU_CPACR + str r2,[r1] + .endm + +//============================================================================ +// Store FPU context during exception if FPU was disabled then enamble it. + + .macro hal_fpu_exc_push + hal_fpu_enable + vmrs r1,fpscr + stmdb r0!,{r1} + vstmdb.f64 r0!,{d0-d15} + .endm + +//============================================================================ +// Restore FPU context during exception and undo FPU enable. + + .macro hal_fpu_exc_pop + vldmia.f64 r0!,{d0-d15} + ldmia r0!,{r1} + vmsr fpscr,r1 + hal_fpu_undo_enable + .endm + +//============================================================================ +// Make fake fpu frame for hal_pendable_svc_vsr + + .macro hal_fpu_isr_fake_frame_push + sub r12,#4 + vmrs r1,fpscr + stmdb r12!,{r1} + vstmdb.f32 r12!,{s0-s15} + .endm + +# else // CYGINT_HAL_FPV4_SP_D16 +# error Unknown Floating Point Unit! +# endif // CYGINT_HAL_FPV4_SP_D16 + +#endif //CYGHWR_HAL_CORTEXM_FPU + +// end of hal_arch.inc |