projects / OpenSPARC-T2-DV / blame
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|---|---|---|
| 86530b38 AT |
1 | /* |
| 2 | * ========== Copyright Header Begin ========================================== | |
| 3 | * | |
| 4 | * OpenSPARC T2 Processor File: syscall_handler.s | |
| 5 | * Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved | |
| 6 | * 4150 Network Circle, Santa Clara, California 95054, U.S.A. | |
| 7 | * | |
| 8 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or modify | |
| 11 | * it under the terms of the GNU General Public License as published by | |
| 12 | * the Free Software Foundation; version 2 of the License. | |
| 13 | * | |
| 14 | * This program is distributed in the hope that it will be useful, | |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 | * GNU General Public License for more details. | |
| 18 | * | |
| 19 | * You should have received a copy of the GNU General Public License | |
| 20 | * along with this program; if not, write to the Free Software | |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 22 | * | |
| 23 | * For the avoidance of doubt, and except that if any non-GPL license | |
| 24 | * choice is available it will apply instead, Sun elects to use only | |
| 25 | * the General Public License version 2 (GPLv2) at this time for any | |
| 26 | * software where a choice of GPL license versions is made | |
| 27 | * available with the language indicating that GPLv2 or any later version | |
| 28 | * may be used, or where a choice of which version of the GPL is applied is | |
| 29 | * otherwise unspecified. | |
| 30 | * | |
| 31 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 32 | * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 33 | * have any questions. | |
| 34 | * | |
| 35 | * | |
| 36 | * ========== Copyright Header End ============================================ | |
| 37 | */ | |
| 38 | syscall_handler: | |
| 39 | ! get tpc/tnpc/tstate and save them | |
| 40 | rdpr %tpc, %g1 | |
| 41 | rdpr %tnpc, %g2 | |
| 42 | rdpr %tstate, %g3 | |
| 43 | stx %g1, [%g4] ! save tpc | |
| 44 | stx %g2, [%g4+8] ! save tnpc | |
| 45 | stx %g3, [%g4+16] ! save tstate | |
| 46 | setx kernel_syscall, %g1, %g2 | |
| 47 | wrpr %g2, %g0, %tnpc | |
| 48 | sllx %g3, 59, %g3 ! extract cwp from tstate | |
| 49 | srlx %g3, 59, %g3 | |
| 50 | setx cregs_tstate_r64, %g1, %g2 | |
| 51 | srlx %g2, 5, %g2 ! remove cwp from cregs_tstate_r64 | |
| 52 | sllx %g2, 5, %g2 | |
| 53 | or %g3, %g2, %g3 | |
| 54 | wrpr %g3, %g0, %tstate | |
| 55 | ||
| 56 | ! get primary/secondary context and save them | |
| 57 | mov 0x8, %g1 | |
| 58 | ldxa [%g1] 0x21, %g2 | |
| 59 | stx %g2, [%g4+24] ! save p context | |
| 60 | stxa %g0, [%g1] 0x21 ! set p context to zero | |
| 61 | ||
| 62 | mov 0x10, %g1 | |
| 63 | ldxa [%g1] 0x21, %g3 | |
| 64 | stx %g3, [%g4+32] ! save s context | |
| 65 | stxa %g0, [%g1] 0x21 ! set s context to zero | |
| 66 | ||
| 67 | ! go to kernel | |
| 68 | done | |
| 69 | nop | |
| 70 | ||
| 71 | ||
| 72 | sysret_handler: | |
| 73 | ! restore tpc/tnpc/tstate | |
| 74 | ldx [%g4], %g1 ! get tpc | |
| 75 | ldx [%g4+8], %g2 ! get tnpc | |
| 76 | ldx [%g4+16], %g3 ! get tstate | |
| 77 | wrpr %g1, %g0, %tpc | |
| 78 | wrpr %g2, %g0, %tnpc | |
| 79 | wrpr %g3, %g0, %tstate | |
| 80 | ||
| 81 | ! restore primary/secondary context | |
| 82 | mov 0x8, %g1 | |
| 83 | ldx [%g4+24], %g2 ! get p context | |
| 84 | stxa %g2, [%g1] 0x21 | |
| 85 | ||
| 86 | mov 0x10, %g1 | |
| 87 | ldx [%g4+32], %g3 ! get s context | |
| 88 | stxa %g3, [%g1] 0x21 | |
| 89 | ||
| 90 | ! return to user | |
| 91 | done | |
| 92 | nop | |
| 93 |