1/* c-isr library stuff of Andes NDS32 cpu for GNU compiler 2 Copyright (C) 2012-2020 Free Software Foundation, Inc. 3 Contributed by Andes Technology Corporation. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it 8 under the terms of the GNU General Public License as published 9 by the Free Software Foundation; either version 3, or (at your 10 option) any later version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 15 License for more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26#include "save_usr_regs.inc" 27#include "save_mac_regs.inc" 28#include "save_fpu_regs.inc" 29#include "save_fpu_regs_00.inc" 30#include "save_fpu_regs_01.inc" 31#include "save_fpu_regs_02.inc" 32#include "save_fpu_regs_03.inc" 33#include "save_all.inc" 34#include "save_partial.inc" 35#include "adj_intr_lvl.inc" 36#include "restore_fpu_regs_00.inc" 37#include "restore_fpu_regs_01.inc" 38#include "restore_fpu_regs_02.inc" 39#include "restore_fpu_regs_03.inc" 40#include "restore_fpu_regs.inc" 41#include "restore_mac_regs.inc" 42#include "restore_usr_regs.inc" 43#include "restore_all.inc" 44#include "restore_partial.inc" 45 46 .section .nds32_isr, "ax" /* Put it in the section of 1st level handler. */ 47 .align 1 48 49/* First Level Handlers 50 1. First Level Handlers are invokded in vector section via jump instruction 51 with specific names for different configurations. 52 2. Naming Format: _nds32_e_SR_NT for exception handlers. 53 _nds32_i_SR_NT for interrupt handlers. 54 2.1 All upper case letters are replaced with specific lower case letters encodings. 55 2.2 SR -- Saved Registers 56 sa: Save All regs (context) 57 ps: Partial Save (all caller-saved regs) 58 2.3 NT -- Nested Type 59 ns: nested 60 nn: not nested 61 nr: nested ready */ 62 63#ifdef NDS32_SAVE_ALL_REGS 64#if defined(NDS32_NESTED) 65 .globl _nds32_e_sa_ns 66 .type _nds32_e_sa_ns, @function 67_nds32_e_sa_ns: 68#elif defined(NDS32_NESTED_READY) 69 .globl _nds32_e_sa_nr 70 .type _nds32_e_sa_nr, @function 71_nds32_e_sa_nr: 72#else /* Not nested handler. */ 73 .globl _nds32_e_sa_nn 74 .type _nds32_e_sa_nn, @function 75_nds32_e_sa_nn: 76#endif /* endif for Nest Type */ 77#else /* not NDS32_SAVE_ALL_REGS */ 78#if defined(NDS32_NESTED) 79 .globl _nds32_e_ps_ns 80 .type _nds32_e_ps_ns, @function 81_nds32_e_ps_ns: 82#elif defined(NDS32_NESTED_READY) 83 .globl _nds32_e_ps_nr 84 .type _nds32_e_ps_nr, @function 85_nds32_e_ps_nr: 86#else /* Not nested handler. */ 87 .globl _nds32_e_ps_nn 88 .type _nds32_e_ps_nn, @function 89_nds32_e_ps_nn: 90#endif /* endif for Nest Type */ 91#endif /* not NDS32_SAVE_ALL_REGS */ 92 93 94/* For 4-byte vector size version, the vector id is 95 extracted from $ITYPE and is set into $r0 by library. 96 For 16-byte vector size version, the vector id 97 is set into $r0 in vector section by compiler. */ 98 99/* Save used registers. */ 100#ifdef NDS32_SAVE_ALL_REGS 101 SAVE_ALL 102#else 103 SAVE_PARTIAL 104#endif 105 106 /* Prepare to call 2nd level handler. */ 107 la $r2, _nds32_jmptbl_00 108 lw $r2, [$r2 + $r0 << #2] 109 ADJ_INTR_LVL /* Adjust INTR level. $r3 is clobbered. */ 110 jral $r2 111 112/* Restore used registers. */ 113#ifdef NDS32_SAVE_ALL_REGS 114 RESTORE_ALL 115#else 116 RESTORE_PARTIAL 117#endif 118 iret 119 120 121#ifdef NDS32_SAVE_ALL_REGS 122#if defined(NDS32_NESTED) 123 .size _nds32_e_sa_ns, .-_nds32_e_sa_ns 124#elif defined(NDS32_NESTED_READY) 125 .size _nds32_e_sa_nr, .-_nds32_e_sa_nr 126#else /* Not nested handler. */ 127 .size _nds32_e_sa_nn, .-_nds32_e_sa_nn 128#endif /* endif for Nest Type */ 129#else /* not NDS32_SAVE_ALL_REGS */ 130#if defined(NDS32_NESTED) 131 .size _nds32_e_ps_ns, .-_nds32_e_ps_ns 132#elif defined(NDS32_NESTED_READY) 133 .size _nds32_e_ps_nr, .-_nds32_e_ps_nr 134#else /* Not nested handler. */ 135 .size _nds32_e_ps_nn, .-_nds32_e_ps_nn 136#endif /* endif for Nest Type */ 137#endif /* not NDS32_SAVE_ALL_REGS */ 138