Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 1 | #ifndef _ASM_POWERPC_EXCEPTION_H |
| 2 | #define _ASM_POWERPC_EXCEPTION_H |
| 3 | /* |
| 4 | * Extracted from head_64.S |
| 5 | * |
| 6 | * PowerPC version |
| 7 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| 8 | * |
| 9 | * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP |
| 10 | * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> |
| 11 | * Adapted for Power Macintosh by Paul Mackerras. |
| 12 | * Low-level exception handlers and MMU support |
| 13 | * rewritten by Paul Mackerras. |
| 14 | * Copyright (C) 1996 Paul Mackerras. |
| 15 | * |
| 16 | * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and |
| 17 | * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com |
| 18 | * |
| 19 | * This file contains the low-level support and setup for the |
| 20 | * PowerPC-64 platform, including trap and interrupt dispatch. |
| 21 | * |
| 22 | * This program is free software; you can redistribute it and/or |
| 23 | * modify it under the terms of the GNU General Public License |
| 24 | * as published by the Free Software Foundation; either version |
| 25 | * 2 of the License, or (at your option) any later version. |
| 26 | */ |
| 27 | /* |
| 28 | * The following macros define the code that appears as |
| 29 | * the prologue to each of the exception handlers. They |
| 30 | * are split into two parts to allow a single kernel binary |
| 31 | * to be used for pSeries and iSeries. |
| 32 | * |
| 33 | * We make as much of the exception code common between native |
| 34 | * exception handlers (including pSeries LPAR) and iSeries LPAR |
| 35 | * implementations as possible. |
| 36 | */ |
| 37 | |
| 38 | #define EX_R9 0 |
| 39 | #define EX_R10 8 |
| 40 | #define EX_R11 16 |
| 41 | #define EX_R12 24 |
| 42 | #define EX_R13 32 |
| 43 | #define EX_SRR0 40 |
| 44 | #define EX_DAR 48 |
| 45 | #define EX_DSISR 56 |
| 46 | #define EX_CCR 60 |
| 47 | #define EX_R3 64 |
| 48 | #define EX_LR 72 |
| 49 | |
| 50 | /* |
| 51 | * We're short on space and time in the exception prolog, so we can't |
| 52 | * use the normal SET_REG_IMMEDIATE macro. Normally we just need the |
| 53 | * low halfword of the address, but for Kdump we need the whole low |
| 54 | * word. |
| 55 | */ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 56 | #define LOAD_HANDLER(reg, label) \ |
Paul Mackerras | 1f6a93e | 2008-08-30 11:40:24 +1000 | [diff] [blame] | 57 | addi reg,reg,(label)-_stext; /* virt addr of handler ... */ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 58 | |
Stephen Rothwell | 7180e3e | 2007-08-22 13:48:37 +1000 | [diff] [blame] | 59 | #define EXCEPTION_PROLOG_1(area) \ |
Benjamin Herrenschmidt | ee43eb7 | 2009-07-14 20:52:54 +0000 | [diff] [blame] | 60 | mfspr r13,SPRN_SPRG_PACA; /* get paca address into r13 */ \ |
Stephen Rothwell | 7180e3e | 2007-08-22 13:48:37 +1000 | [diff] [blame] | 61 | std r9,area+EX_R9(r13); /* save r9 - r12 */ \ |
| 62 | std r10,area+EX_R10(r13); \ |
| 63 | std r11,area+EX_R11(r13); \ |
| 64 | std r12,area+EX_R12(r13); \ |
Benjamin Herrenschmidt | ee43eb7 | 2009-07-14 20:52:54 +0000 | [diff] [blame] | 65 | mfspr r9,SPRN_SPRG_SCRATCH0; \ |
Stephen Rothwell | 7180e3e | 2007-08-22 13:48:37 +1000 | [diff] [blame] | 66 | std r9,area+EX_R13(r13); \ |
| 67 | mfcr r9 |
| 68 | |
Benjamin Herrenschmidt | c5a8c0c | 2009-07-16 19:36:57 +0000 | [diff] [blame] | 69 | #define EXCEPTION_PROLOG_PSERIES_1(label) \ |
Paul Mackerras | 1f6a93e | 2008-08-30 11:40:24 +1000 | [diff] [blame] | 70 | ld r12,PACAKBASE(r13); /* get high part of &label */ \ |
| 71 | ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 72 | mfspr r11,SPRN_SRR0; /* save SRR0 */ \ |
| 73 | LOAD_HANDLER(r12,label) \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 74 | mtspr SPRN_SRR0,r12; \ |
| 75 | mfspr r12,SPRN_SRR1; /* and SRR1 */ \ |
| 76 | mtspr SPRN_SRR1,r10; \ |
| 77 | rfid; \ |
| 78 | b . /* prevent speculative execution */ |
| 79 | |
Benjamin Herrenschmidt | c5a8c0c | 2009-07-16 19:36:57 +0000 | [diff] [blame] | 80 | #define EXCEPTION_PROLOG_PSERIES(area, label) \ |
| 81 | EXCEPTION_PROLOG_1(area); \ |
| 82 | EXCEPTION_PROLOG_PSERIES_1(label); |
| 83 | |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 84 | /* |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 85 | * The common exception prolog is used for all except a few exceptions |
| 86 | * such as a segment miss on a kernel address. We have to be prepared |
| 87 | * to take another exception from the point where we first touch the |
| 88 | * kernel stack onwards. |
| 89 | * |
| 90 | * On entry r13 points to the paca, r9-r13 are saved in the paca, |
| 91 | * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and |
| 92 | * SRR1, and relocation is on. |
| 93 | */ |
| 94 | #define EXCEPTION_PROLOG_COMMON(n, area) \ |
| 95 | andi. r10,r12,MSR_PR; /* See if coming from user */ \ |
| 96 | mr r10,r1; /* Save r1 */ \ |
| 97 | subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \ |
| 98 | beq- 1f; \ |
| 99 | ld r1,PACAKSAVE(r13); /* kernel stack to use */ \ |
| 100 | 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \ |
| 101 | bge- cr1,2f; /* abort if it is */ \ |
| 102 | b 3f; \ |
| 103 | 2: li r1,(n); /* will be reloaded later */ \ |
| 104 | sth r1,PACA_TRAP_SAVE(r13); \ |
| 105 | b bad_stack; \ |
| 106 | 3: std r9,_CCR(r1); /* save CR in stackframe */ \ |
| 107 | std r11,_NIP(r1); /* save SRR0 in stackframe */ \ |
| 108 | std r12,_MSR(r1); /* save SRR1 in stackframe */ \ |
| 109 | std r10,0(r1); /* make stack chain pointer */ \ |
| 110 | std r0,GPR0(r1); /* save r0 in stackframe */ \ |
| 111 | std r10,GPR1(r1); /* save r1 in stackframe */ \ |
| 112 | ACCOUNT_CPU_USER_ENTRY(r9, r10); \ |
| 113 | std r2,GPR2(r1); /* save r2 in stackframe */ \ |
| 114 | SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \ |
| 115 | SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \ |
| 116 | ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \ |
| 117 | ld r10,area+EX_R10(r13); \ |
| 118 | std r9,GPR9(r1); \ |
| 119 | std r10,GPR10(r1); \ |
| 120 | ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \ |
| 121 | ld r10,area+EX_R12(r13); \ |
| 122 | ld r11,area+EX_R13(r13); \ |
| 123 | std r9,GPR11(r1); \ |
| 124 | std r10,GPR12(r1); \ |
| 125 | std r11,GPR13(r1); \ |
| 126 | ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \ |
| 127 | mflr r9; /* save LR in stackframe */ \ |
| 128 | std r9,_LINK(r1); \ |
| 129 | mfctr r10; /* save CTR in stackframe */ \ |
| 130 | std r10,_CTR(r1); \ |
| 131 | lbz r10,PACASOFTIRQEN(r13); \ |
| 132 | mfspr r11,SPRN_XER; /* save XER in stackframe */ \ |
| 133 | std r10,SOFTE(r1); \ |
| 134 | std r11,_XER(r1); \ |
| 135 | li r9,(n)+1; \ |
| 136 | std r9,_TRAP(r1); /* set trap number */ \ |
| 137 | li r10,0; \ |
| 138 | ld r11,exception_marker@toc(r2); \ |
| 139 | std r10,RESULT(r1); /* clear regs->result */ \ |
| 140 | std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ |
| 141 | |
| 142 | /* |
| 143 | * Exception vectors. |
| 144 | */ |
| 145 | #define STD_EXCEPTION_PSERIES(n, label) \ |
| 146 | . = n; \ |
| 147 | .globl label##_pSeries; \ |
| 148 | label##_pSeries: \ |
| 149 | HMT_MEDIUM; \ |
Alexander Graf | 842f2fe | 2009-10-30 05:47:17 +0000 | [diff] [blame] | 150 | DO_KVM n; \ |
Benjamin Herrenschmidt | ee43eb7 | 2009-07-14 20:52:54 +0000 | [diff] [blame] | 151 | mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 152 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common) |
| 153 | |
| 154 | #define HSTD_EXCEPTION_PSERIES(n, label) \ |
| 155 | . = n; \ |
| 156 | .globl label##_pSeries; \ |
| 157 | label##_pSeries: \ |
| 158 | HMT_MEDIUM; \ |
Benjamin Herrenschmidt | ee43eb7 | 2009-07-14 20:52:54 +0000 | [diff] [blame] | 159 | mtspr SPRN_SPRG_SCRATCH0,r20; /* save r20 */ \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 160 | mfspr r20,SPRN_HSRR0; /* copy HSRR0 to SRR0 */ \ |
| 161 | mtspr SPRN_SRR0,r20; \ |
| 162 | mfspr r20,SPRN_HSRR1; /* copy HSRR0 to SRR0 */ \ |
| 163 | mtspr SPRN_SRR1,r20; \ |
Benjamin Herrenschmidt | ee43eb7 | 2009-07-14 20:52:54 +0000 | [diff] [blame] | 164 | mfspr r20,SPRN_SPRG_SCRATCH0; /* restore r20 */ \ |
| 165 | mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 166 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common) |
| 167 | |
| 168 | |
| 169 | #define MASKABLE_EXCEPTION_PSERIES(n, label) \ |
| 170 | . = n; \ |
| 171 | .globl label##_pSeries; \ |
| 172 | label##_pSeries: \ |
| 173 | HMT_MEDIUM; \ |
Alexander Graf | 842f2fe | 2009-10-30 05:47:17 +0000 | [diff] [blame] | 174 | DO_KVM n; \ |
Benjamin Herrenschmidt | ee43eb7 | 2009-07-14 20:52:54 +0000 | [diff] [blame] | 175 | mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \ |
| 176 | mfspr r13,SPRN_SPRG_PACA; /* get paca address into r13 */ \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 177 | std r9,PACA_EXGEN+EX_R9(r13); /* save r9, r10 */ \ |
| 178 | std r10,PACA_EXGEN+EX_R10(r13); \ |
| 179 | lbz r10,PACASOFTIRQEN(r13); \ |
| 180 | mfcr r9; \ |
| 181 | cmpwi r10,0; \ |
| 182 | beq masked_interrupt; \ |
Benjamin Herrenschmidt | ee43eb7 | 2009-07-14 20:52:54 +0000 | [diff] [blame] | 183 | mfspr r10,SPRN_SPRG_SCRATCH0; \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 184 | std r10,PACA_EXGEN+EX_R13(r13); \ |
| 185 | std r11,PACA_EXGEN+EX_R11(r13); \ |
| 186 | std r12,PACA_EXGEN+EX_R12(r13); \ |
Paul Mackerras | 1f6a93e | 2008-08-30 11:40:24 +1000 | [diff] [blame] | 187 | ld r12,PACAKBASE(r13); /* get high part of &label */ \ |
| 188 | ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 189 | mfspr r11,SPRN_SRR0; /* save SRR0 */ \ |
| 190 | LOAD_HANDLER(r12,label##_common) \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 191 | mtspr SPRN_SRR0,r12; \ |
| 192 | mfspr r12,SPRN_SRR1; /* and SRR1 */ \ |
| 193 | mtspr SPRN_SRR1,r10; \ |
| 194 | rfid; \ |
| 195 | b . /* prevent speculative execution */ |
| 196 | |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 197 | #ifdef CONFIG_PPC_ISERIES |
| 198 | #define DISABLE_INTS \ |
| 199 | li r11,0; \ |
| 200 | stb r11,PACASOFTIRQEN(r13); \ |
| 201 | BEGIN_FW_FTR_SECTION; \ |
| 202 | stb r11,PACAHARDIRQEN(r13); \ |
| 203 | END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \ |
Benjamin Herrenschmidt | 945feb1 | 2008-04-17 14:35:01 +1000 | [diff] [blame] | 204 | TRACE_DISABLE_INTS; \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 205 | BEGIN_FW_FTR_SECTION; \ |
| 206 | mfmsr r10; \ |
| 207 | ori r10,r10,MSR_EE; \ |
| 208 | mtmsrd r10,1; \ |
| 209 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 210 | #else |
| 211 | #define DISABLE_INTS \ |
| 212 | li r11,0; \ |
| 213 | stb r11,PACASOFTIRQEN(r13); \ |
Benjamin Herrenschmidt | 945feb1 | 2008-04-17 14:35:01 +1000 | [diff] [blame] | 214 | stb r11,PACAHARDIRQEN(r13); \ |
| 215 | TRACE_DISABLE_INTS |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 216 | #endif /* CONFIG_PPC_ISERIES */ |
| 217 | |
| 218 | #define ENABLE_INTS \ |
| 219 | ld r12,_MSR(r1); \ |
| 220 | mfmsr r11; \ |
| 221 | rlwimi r11,r12,0,MSR_EE; \ |
| 222 | mtmsrd r11,1 |
| 223 | |
| 224 | #define STD_EXCEPTION_COMMON(trap, label, hdlr) \ |
| 225 | .align 7; \ |
| 226 | .globl label##_common; \ |
| 227 | label##_common: \ |
| 228 | EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ |
| 229 | DISABLE_INTS; \ |
| 230 | bl .save_nvgprs; \ |
| 231 | addi r3,r1,STACK_FRAME_OVERHEAD; \ |
| 232 | bl hdlr; \ |
| 233 | b .ret_from_except |
| 234 | |
| 235 | /* |
| 236 | * Like STD_EXCEPTION_COMMON, but for exceptions that can occur |
| 237 | * in the idle task and therefore need the special idle handling. |
| 238 | */ |
| 239 | #define STD_EXCEPTION_COMMON_IDLE(trap, label, hdlr) \ |
| 240 | .align 7; \ |
| 241 | .globl label##_common; \ |
| 242 | label##_common: \ |
| 243 | EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ |
| 244 | FINISH_NAP; \ |
| 245 | DISABLE_INTS; \ |
| 246 | bl .save_nvgprs; \ |
| 247 | addi r3,r1,STACK_FRAME_OVERHEAD; \ |
| 248 | bl hdlr; \ |
| 249 | b .ret_from_except |
| 250 | |
| 251 | #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \ |
| 252 | .align 7; \ |
| 253 | .globl label##_common; \ |
| 254 | label##_common: \ |
| 255 | EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ |
| 256 | FINISH_NAP; \ |
| 257 | DISABLE_INTS; \ |
Olof Johansson | a416561 | 2007-09-05 12:42:30 +1000 | [diff] [blame] | 258 | BEGIN_FTR_SECTION \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 259 | bl .ppc64_runlatch_on; \ |
Olof Johansson | a416561 | 2007-09-05 12:42:30 +1000 | [diff] [blame] | 260 | END_FTR_SECTION_IFSET(CPU_FTR_CTRL) \ |
Stephen Rothwell | f9ff0f3 | 2007-08-22 13:46:44 +1000 | [diff] [blame] | 261 | addi r3,r1,STACK_FRAME_OVERHEAD; \ |
| 262 | bl hdlr; \ |
| 263 | b .ret_from_except_lite |
| 264 | |
| 265 | /* |
| 266 | * When the idle code in power4_idle puts the CPU into NAP mode, |
| 267 | * it has to do so in a loop, and relies on the external interrupt |
| 268 | * and decrementer interrupt entry code to get it out of the loop. |
| 269 | * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags |
| 270 | * to signal that it is in the loop and needs help to get out. |
| 271 | */ |
| 272 | #ifdef CONFIG_PPC_970_NAP |
| 273 | #define FINISH_NAP \ |
| 274 | BEGIN_FTR_SECTION \ |
| 275 | clrrdi r11,r1,THREAD_SHIFT; \ |
| 276 | ld r9,TI_LOCAL_FLAGS(r11); \ |
| 277 | andi. r10,r9,_TLF_NAPPING; \ |
| 278 | bnel power4_fixup_nap; \ |
| 279 | END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) |
| 280 | #else |
| 281 | #define FINISH_NAP |
| 282 | #endif |
| 283 | |
| 284 | #endif /* _ASM_POWERPC_EXCEPTION_H */ |