1 /* $OpenBSD: cpustate.h,v 1.8 2009/10/22 22:08:52 miod Exp $ */ 2 3 /* 4 * Copyright (c) 2002-2003 Opsycon AB (www.opsycon.se / www.opsycon.com) 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29 #define KERN_REG_SIZE (NUMSAVEREGS * REGSZ) 30 #define KERN_EXC_FRAME_SIZE (CF_SZ + KERN_REG_SIZE + 16) 31 32 #define SAVE_REG(reg, offs, base, bo) \ 33 REG_S reg, bo + (REGSZ * offs) (base) 34 35 #define RESTORE_REG(reg, offs, base, bo) \ 36 REG_L reg, bo + (REGSZ * offs) (base) 37 38 /* 39 * This macro saves the 'scratch' cpu state on stack. 40 * Macros are generic so no 'special' instructions! 41 * a0 will have a pointer to the 'frame' on return. 42 * a1 will have saved STATUS_REG on return. 43 * a3 will have the exception pc on 'return'. 44 * No traps, no interrupts if frame = k1 or k0! 45 * Temp regs are saved with their register number so 46 * branch emulation etc works properly. 47 */ 48 #define SAVE_CPU(frame, bo) \ 49 SAVE_REG(AT, AST, frame, bo) ;\ 50 SAVE_REG(v0, V0, frame, bo) ;\ 51 SAVE_REG(v1, V1, frame, bo) ;\ 52 SAVE_REG(a0, A0, frame, bo) ;\ 53 SAVE_REG(a1, A1, frame, bo) ;\ 54 SAVE_REG(a2, A2, frame, bo) ;\ 55 SAVE_REG(a3, A3, frame, bo) ;\ 56 SAVE_REG($8, T0, frame, bo) ;\ 57 SAVE_REG($9, T1, frame, bo) ;\ 58 SAVE_REG($10, T2, frame, bo) ;\ 59 SAVE_REG($11, T3, frame, bo) ;\ 60 SAVE_REG($12, T4, frame, bo) ;\ 61 SAVE_REG($13, T5, frame, bo) ;\ 62 SAVE_REG($14, T6, frame, bo) ;\ 63 SAVE_REG($15, T7, frame, bo) ;\ 64 SAVE_REG(t8, T8, frame, bo) ;\ 65 SAVE_REG(t9, T9, frame, bo) ;\ 66 SAVE_REG(gp, GP, frame, bo) ;\ 67 SAVE_REG(ra, RA, frame, bo) ;\ 68 mflo v0 ;\ 69 mfhi v1 ;\ 70 mfc0 a0, COP_0_CAUSE_REG ;\ 71 mfc0 a1, COP_0_STATUS_REG ;\ 72 dmfc0 a2, COP_0_BAD_VADDR ;\ 73 dmfc0 a3, COP_0_EXC_PC ;\ 74 SAVE_REG(v0, MULLO, frame, bo) ;\ 75 SAVE_REG(v1, MULHI, frame, bo) ;\ 76 SAVE_REG(a0, CAUSE, frame, bo) ;\ 77 SAVE_REG(a1, SR, frame, bo) ;\ 78 SAVE_REG(a2, BADVADDR, frame, bo) ;\ 79 SAVE_REG(a3, PC, frame, bo) ;\ 80 SAVE_REG(sp, SP, frame, bo) ;\ 81 PTR_ADDU a0, frame, bo ;\ 82 GET_CPU_INFO(v0, v1) ;\ 83 lw a2, CI_IPL(v0) ;\ 84 SAVE_REG(a2, CPL, frame, bo) 85 86 /* 87 * Save 'callee save' registers in frame to aid DDB. 88 */ 89 #define SAVE_CPU_SREG(frame, bo) \ 90 SAVE_REG(s0, S0, frame, bo) ;\ 91 SAVE_REG(s1, S1, frame, bo) ;\ 92 SAVE_REG(s2, S2, frame, bo) ;\ 93 SAVE_REG(s3, S3, frame, bo) ;\ 94 SAVE_REG(s4, S4, frame, bo) ;\ 95 SAVE_REG(s5, S5, frame, bo) ;\ 96 SAVE_REG(s6, S6, frame, bo) ;\ 97 SAVE_REG(s7, S7, frame, bo) ;\ 98 SAVE_REG(s8, S8, frame, bo) 99 100 /* 101 * Restore cpu state. When called a0 = EXC_PC. 102 */ 103 #define RESTORE_CPU(frame, bo) \ 104 RESTORE_REG(t1, SR, frame, bo) ;\ 105 RESTORE_REG(t2, MULLO, frame, bo) ;\ 106 RESTORE_REG(t3, MULHI, frame, bo) ;\ 107 mtc0 t1, COP_0_STATUS_REG ;\ 108 mtlo t2 ;\ 109 mthi t3 ;\ 110 dmtc0 a0, COP_0_EXC_PC ;\ 111 RESTORE_REG(AT, AST, frame, bo) ;\ 112 RESTORE_REG(v0, V0, frame, bo) ;\ 113 RESTORE_REG(v1, V1, frame, bo) ;\ 114 RESTORE_REG(a0, A0, frame, bo) ;\ 115 RESTORE_REG(a1, A1, frame, bo) ;\ 116 RESTORE_REG(a2, A2, frame, bo) ;\ 117 RESTORE_REG(a3, A3, frame, bo) ;\ 118 RESTORE_REG($8, T0, frame, bo) ;\ 119 RESTORE_REG($9, T1, frame, bo) ;\ 120 RESTORE_REG($10, T2, frame, bo) ;\ 121 RESTORE_REG($11, T3, frame, bo) ;\ 122 RESTORE_REG($12, T4, frame, bo) ;\ 123 RESTORE_REG($13, T5, frame, bo) ;\ 124 RESTORE_REG($14, T6, frame, bo) ;\ 125 RESTORE_REG($15, T7, frame, bo) ;\ 126 RESTORE_REG(t8, T8, frame, bo) ;\ 127 RESTORE_REG(t9, T9, frame, bo) ;\ 128 RESTORE_REG(gp, GP, frame, bo) ;\ 129 RESTORE_REG(ra, RA, frame, bo) 130 131 /* 132 * Restore 'callee save' registers 133 */ 134 #define RESTORE_CPU_SREG(frame, bo) \ 135 RESTORE_REG(s0, S0, frame, bo) ;\ 136 RESTORE_REG(s1, S1, frame, bo) ;\ 137 RESTORE_REG(s2, S2, frame, bo) ;\ 138 RESTORE_REG(s3, S3, frame, bo) ;\ 139 RESTORE_REG(s4, S4, frame, bo) ;\ 140 RESTORE_REG(s5, S5, frame, bo) ;\ 141 RESTORE_REG(s6, S6, frame, bo) ;\ 142 RESTORE_REG(s7, S7, frame, bo) ;\ 143 RESTORE_REG(s8, S8, frame, bo) 144 145