Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Low-level system-call handling, trap handlers and context-switching |
| 3 | * |
| 4 | * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> |
| 5 | * Copyright (C) 2008-2009 PetaLogix |
| 6 | * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au> |
| 7 | * Copyright (C) 2001,2002 NEC Corporation |
| 8 | * Copyright (C) 2001,2002 Miles Bader <miles@gnu.org> |
| 9 | * |
| 10 | * This file is subject to the terms and conditions of the GNU General |
| 11 | * Public License. See the file COPYING in the main directory of this |
| 12 | * archive for more details. |
| 13 | * |
| 14 | * Written by Miles Bader <miles@gnu.org> |
| 15 | * Heavily modified by John Williams for Microblaze |
| 16 | */ |
| 17 | |
| 18 | #include <linux/sys.h> |
| 19 | #include <linux/linkage.h> |
| 20 | |
| 21 | #include <asm/entry.h> |
| 22 | #include <asm/current.h> |
| 23 | #include <asm/processor.h> |
| 24 | #include <asm/exceptions.h> |
| 25 | #include <asm/asm-offsets.h> |
| 26 | #include <asm/thread_info.h> |
| 27 | |
| 28 | #include <asm/page.h> |
| 29 | #include <asm/unistd.h> |
| 30 | |
| 31 | #include <linux/errno.h> |
| 32 | #include <asm/signal.h> |
| 33 | |
Michal Simek | 11d5136 | 2009-12-07 08:21:34 +0100 | [diff] [blame] | 34 | #undef DEBUG |
| 35 | |
Michal Simek | d8748e7 | 2011-01-31 15:04:43 +0100 | [diff] [blame] | 36 | #ifdef DEBUG |
| 37 | /* Create space for syscalls counting. */ |
| 38 | .section .data |
| 39 | .global syscall_debug_table |
| 40 | .align 4 |
| 41 | syscall_debug_table: |
| 42 | .space (__NR_syscalls * 4) |
| 43 | #endif /* DEBUG */ |
| 44 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 45 | #define C_ENTRY(name) .globl name; .align 4; name |
| 46 | |
| 47 | /* |
| 48 | * Various ways of setting and clearing BIP in flags reg. |
| 49 | * This is mucky, but necessary using microblaze version that |
| 50 | * allows msr ops to write to BIP |
| 51 | */ |
| 52 | #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR |
| 53 | .macro clear_bip |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 54 | msrclr r0, MSR_BIP |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 55 | .endm |
| 56 | |
| 57 | .macro set_bip |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 58 | msrset r0, MSR_BIP |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 59 | .endm |
| 60 | |
| 61 | .macro clear_eip |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 62 | msrclr r0, MSR_EIP |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 63 | .endm |
| 64 | |
| 65 | .macro set_ee |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 66 | msrset r0, MSR_EE |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 67 | .endm |
| 68 | |
| 69 | .macro disable_irq |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 70 | msrclr r0, MSR_IE |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 71 | .endm |
| 72 | |
| 73 | .macro enable_irq |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 74 | msrset r0, MSR_IE |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 75 | .endm |
| 76 | |
| 77 | .macro set_ums |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 78 | msrset r0, MSR_UMS |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 79 | msrclr r0, MSR_VMS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 80 | .endm |
| 81 | |
| 82 | .macro set_vms |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 83 | msrclr r0, MSR_UMS |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 84 | msrset r0, MSR_VMS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 85 | .endm |
| 86 | |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 87 | .macro clear_ums |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 88 | msrclr r0, MSR_UMS |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 89 | .endm |
| 90 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 91 | .macro clear_vms_ums |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 92 | msrclr r0, MSR_VMS | MSR_UMS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 93 | .endm |
| 94 | #else |
| 95 | .macro clear_bip |
| 96 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 97 | andi r11, r11, ~MSR_BIP |
| 98 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 99 | .endm |
| 100 | |
| 101 | .macro set_bip |
| 102 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 103 | ori r11, r11, MSR_BIP |
| 104 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 105 | .endm |
| 106 | |
| 107 | .macro clear_eip |
| 108 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 109 | andi r11, r11, ~MSR_EIP |
| 110 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 111 | .endm |
| 112 | |
| 113 | .macro set_ee |
| 114 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 115 | ori r11, r11, MSR_EE |
| 116 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 117 | .endm |
| 118 | |
| 119 | .macro disable_irq |
| 120 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 121 | andi r11, r11, ~MSR_IE |
| 122 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 123 | .endm |
| 124 | |
| 125 | .macro enable_irq |
| 126 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 127 | ori r11, r11, MSR_IE |
| 128 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 129 | .endm |
| 130 | |
| 131 | .macro set_ums |
| 132 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 133 | ori r11, r11, MSR_VMS |
| 134 | andni r11, r11, MSR_UMS |
| 135 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 136 | .endm |
| 137 | |
| 138 | .macro set_vms |
| 139 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 140 | ori r11, r11, MSR_VMS |
| 141 | andni r11, r11, MSR_UMS |
| 142 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 143 | .endm |
| 144 | |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 145 | .macro clear_ums |
| 146 | mfs r11, rmsr |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 147 | andni r11, r11, MSR_UMS |
| 148 | mts rmsr,r11 |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 149 | .endm |
| 150 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 151 | .macro clear_vms_ums |
| 152 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 153 | andni r11, r11, (MSR_VMS|MSR_UMS) |
| 154 | mts rmsr,r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 155 | .endm |
| 156 | #endif |
| 157 | |
| 158 | /* Define how to call high-level functions. With MMU, virtual mode must be |
| 159 | * enabled when calling the high-level function. Clobbers R11. |
| 160 | * VM_ON, VM_OFF, DO_JUMP_BIPCLR, DO_CALL |
| 161 | */ |
| 162 | |
| 163 | /* turn on virtual protected mode save */ |
| 164 | #define VM_ON \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 165 | set_ums; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 166 | rted r0, 2f; \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 167 | nop; \ |
| 168 | 2: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 169 | |
| 170 | /* turn off virtual protected mode save and user mode save*/ |
| 171 | #define VM_OFF \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 172 | clear_vms_ums; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 173 | rted r0, TOPHYS(1f); \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 174 | nop; \ |
| 175 | 1: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 176 | |
| 177 | #define SAVE_REGS \ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 178 | swi r2, r1, PT_R2; /* Save SDA */ \ |
| 179 | swi r3, r1, PT_R3; \ |
| 180 | swi r4, r1, PT_R4; \ |
| 181 | swi r5, r1, PT_R5; \ |
| 182 | swi r6, r1, PT_R6; \ |
| 183 | swi r7, r1, PT_R7; \ |
| 184 | swi r8, r1, PT_R8; \ |
| 185 | swi r9, r1, PT_R9; \ |
| 186 | swi r10, r1, PT_R10; \ |
| 187 | swi r11, r1, PT_R11; /* save clobbered regs after rval */\ |
| 188 | swi r12, r1, PT_R12; \ |
| 189 | swi r13, r1, PT_R13; /* Save SDA2 */ \ |
| 190 | swi r14, r1, PT_PC; /* PC, before IRQ/trap */ \ |
| 191 | swi r15, r1, PT_R15; /* Save LP */ \ |
| 192 | swi r16, r1, PT_R16; \ |
| 193 | swi r17, r1, PT_R17; \ |
| 194 | swi r18, r1, PT_R18; /* Save asm scratch reg */ \ |
| 195 | swi r19, r1, PT_R19; \ |
| 196 | swi r20, r1, PT_R20; \ |
| 197 | swi r21, r1, PT_R21; \ |
| 198 | swi r22, r1, PT_R22; \ |
| 199 | swi r23, r1, PT_R23; \ |
| 200 | swi r24, r1, PT_R24; \ |
| 201 | swi r25, r1, PT_R25; \ |
| 202 | swi r26, r1, PT_R26; \ |
| 203 | swi r27, r1, PT_R27; \ |
| 204 | swi r28, r1, PT_R28; \ |
| 205 | swi r29, r1, PT_R29; \ |
| 206 | swi r30, r1, PT_R30; \ |
| 207 | swi r31, r1, PT_R31; /* Save current task reg */ \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 208 | mfs r11, rmsr; /* save MSR */ \ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 209 | swi r11, r1, PT_MSR; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 210 | |
| 211 | #define RESTORE_REGS \ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 212 | lwi r11, r1, PT_MSR; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 213 | mts rmsr , r11; \ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 214 | lwi r2, r1, PT_R2; /* restore SDA */ \ |
| 215 | lwi r3, r1, PT_R3; \ |
| 216 | lwi r4, r1, PT_R4; \ |
| 217 | lwi r5, r1, PT_R5; \ |
| 218 | lwi r6, r1, PT_R6; \ |
| 219 | lwi r7, r1, PT_R7; \ |
| 220 | lwi r8, r1, PT_R8; \ |
| 221 | lwi r9, r1, PT_R9; \ |
| 222 | lwi r10, r1, PT_R10; \ |
| 223 | lwi r11, r1, PT_R11; /* restore clobbered regs after rval */\ |
| 224 | lwi r12, r1, PT_R12; \ |
| 225 | lwi r13, r1, PT_R13; /* restore SDA2 */ \ |
| 226 | lwi r14, r1, PT_PC; /* RESTORE_LINK PC, before IRQ/trap */\ |
| 227 | lwi r15, r1, PT_R15; /* restore LP */ \ |
| 228 | lwi r16, r1, PT_R16; \ |
| 229 | lwi r17, r1, PT_R17; \ |
| 230 | lwi r18, r1, PT_R18; /* restore asm scratch reg */ \ |
| 231 | lwi r19, r1, PT_R19; \ |
| 232 | lwi r20, r1, PT_R20; \ |
| 233 | lwi r21, r1, PT_R21; \ |
| 234 | lwi r22, r1, PT_R22; \ |
| 235 | lwi r23, r1, PT_R23; \ |
| 236 | lwi r24, r1, PT_R24; \ |
| 237 | lwi r25, r1, PT_R25; \ |
| 238 | lwi r26, r1, PT_R26; \ |
| 239 | lwi r27, r1, PT_R27; \ |
| 240 | lwi r28, r1, PT_R28; \ |
| 241 | lwi r29, r1, PT_R29; \ |
| 242 | lwi r30, r1, PT_R30; \ |
| 243 | lwi r31, r1, PT_R31; /* Restore cur task reg */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 244 | |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 245 | #define SAVE_STATE \ |
| 246 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* save stack */ \ |
| 247 | /* See if already in kernel mode.*/ \ |
| 248 | mfs r1, rmsr; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 249 | andi r1, r1, MSR_UMS; \ |
| 250 | bnei r1, 1f; \ |
| 251 | /* Kernel-mode state save. */ \ |
| 252 | /* Reload kernel stack-ptr. */ \ |
| 253 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); \ |
Michal Simek | 287503f | 2010-06-22 18:16:07 +0200 | [diff] [blame] | 254 | /* FIXME: I can add these two lines to one */ \ |
| 255 | /* tophys(r1,r1); */ \ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 256 | /* addik r1, r1, -PT_SIZE; */ \ |
| 257 | addik r1, r1, CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - PT_SIZE; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 258 | SAVE_REGS \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 259 | brid 2f; \ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 260 | swi r1, r1, PT_MODE; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 261 | 1: /* User-mode state save. */ \ |
| 262 | lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */\ |
| 263 | tophys(r1,r1); \ |
| 264 | lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ \ |
Michal Simek | 287503f | 2010-06-22 18:16:07 +0200 | [diff] [blame] | 265 | /* MS these three instructions can be added to one */ \ |
| 266 | /* addik r1, r1, THREAD_SIZE; */ \ |
| 267 | /* tophys(r1,r1); */ \ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 268 | /* addik r1, r1, -PT_SIZE; */ \ |
| 269 | addik r1, r1, THREAD_SIZE + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - PT_SIZE; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 270 | SAVE_REGS \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 271 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); \ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 272 | swi r11, r1, PT_R1; /* Store user SP. */ \ |
| 273 | swi r0, r1, PT_MODE; /* Was in user-mode. */ \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 274 | /* MS: I am clearing UMS even in case when I come from kernel space */ \ |
| 275 | clear_ums; \ |
| 276 | 2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
| 277 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 278 | .text |
| 279 | |
| 280 | /* |
| 281 | * User trap. |
| 282 | * |
| 283 | * System calls are handled here. |
| 284 | * |
| 285 | * Syscall protocol: |
| 286 | * Syscall number in r12, args in r5-r10 |
| 287 | * Return value in r3 |
| 288 | * |
| 289 | * Trap entered via brki instruction, so BIP bit is set, and interrupts |
| 290 | * are masked. This is nice, means we don't have to CLI before state save |
| 291 | */ |
| 292 | C_ENTRY(_user_exception): |
Michal Simek | 0e41c90 | 2010-06-22 21:11:49 +0200 | [diff] [blame] | 293 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */ |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 294 | addi r14, r14, 4 /* return address is 4 byte after call */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 295 | |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 296 | mfs r1, rmsr |
| 297 | nop |
| 298 | andi r1, r1, MSR_UMS |
| 299 | bnei r1, 1f |
| 300 | |
| 301 | /* Kernel-mode state save - kernel execve */ |
| 302 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/ |
| 303 | tophys(r1,r1); |
| 304 | |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 305 | addik r1, r1, -PT_SIZE; /* Make room on the stack. */ |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 306 | SAVE_REGS |
| 307 | |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 308 | swi r1, r1, PT_MODE; /* pt_regs -> kernel mode */ |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 309 | brid 2f; |
| 310 | nop; /* Fill delay slot */ |
| 311 | |
| 312 | /* User-mode state save. */ |
| 313 | 1: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 314 | lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ |
| 315 | tophys(r1,r1); |
| 316 | lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */ |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 317 | /* calculate kernel stack pointer from task struct 8k */ |
| 318 | addik r1, r1, THREAD_SIZE; |
| 319 | tophys(r1,r1); |
| 320 | |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 321 | addik r1, r1, -PT_SIZE; /* Make room on the stack. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 322 | SAVE_REGS |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 323 | swi r0, r1, PT_R3 |
| 324 | swi r0, r1, PT_R4 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 325 | |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 326 | swi r0, r1, PT_MODE; /* Was in user-mode. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 327 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 328 | swi r11, r1, PT_R1; /* Store user SP. */ |
Michal Simek | 25f6e59 | 2010-06-22 18:29:05 +0200 | [diff] [blame] | 329 | clear_ums; |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 330 | 2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 331 | /* Save away the syscall number. */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 332 | swi r12, r1, PT_R0; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 333 | tovirt(r1,r1) |
| 334 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 335 | /* where the trap should return need -8 to adjust for rtsd r15, 8*/ |
| 336 | /* Jump to the appropriate function for the system call number in r12 |
| 337 | * (r12 is not preserved), or return an error if r12 is not valid. The LP |
| 338 | * register should point to the location where |
| 339 | * the called function should return. [note that MAKE_SYS_CALL uses label 1] */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 340 | |
Michal Simek | 25f6e59 | 2010-06-22 18:29:05 +0200 | [diff] [blame] | 341 | /* Step into virtual mode */ |
| 342 | rtbd r0, 3f |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 343 | nop |
| 344 | 3: |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 345 | lwi r11, CURRENT_TASK, TS_THREAD_INFO /* get thread info */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 346 | lwi r11, r11, TI_FLAGS /* get flags in thread info */ |
| 347 | andi r11, r11, _TIF_WORK_SYSCALL_MASK |
| 348 | beqi r11, 4f |
| 349 | |
| 350 | addik r3, r0, -ENOSYS |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 351 | swi r3, r1, PT_R3 |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 352 | brlid r15, do_syscall_trace_enter |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 353 | addik r5, r1, PT_R0 |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 354 | |
| 355 | # do_syscall_trace_enter returns the new syscall nr. |
| 356 | addk r12, r0, r3 |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 357 | lwi r5, r1, PT_R5; |
| 358 | lwi r6, r1, PT_R6; |
| 359 | lwi r7, r1, PT_R7; |
| 360 | lwi r8, r1, PT_R8; |
| 361 | lwi r9, r1, PT_R9; |
| 362 | lwi r10, r1, PT_R10; |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 363 | 4: |
| 364 | /* Jump to the appropriate function for the system call number in r12 |
| 365 | * (r12 is not preserved), or return an error if r12 is not valid. |
| 366 | * The LP register should point to the location where the called function |
| 367 | * should return. [note that MAKE_SYS_CALL uses label 1] */ |
| 368 | /* See if the system call number is valid */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 369 | addi r11, r12, -__NR_syscalls; |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 370 | bgei r11,5f; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 371 | /* Figure out which function to use for this system call. */ |
| 372 | /* Note Microblaze barrel shift is optional, so don't rely on it */ |
| 373 | add r12, r12, r12; /* convert num -> ptr */ |
| 374 | add r12, r12, r12; |
| 375 | |
Michal Simek | 11d5136 | 2009-12-07 08:21:34 +0100 | [diff] [blame] | 376 | #ifdef DEBUG |
Michal Simek | d8748e7 | 2011-01-31 15:04:43 +0100 | [diff] [blame] | 377 | /* Trac syscalls and stored them to syscall_debug_table */ |
| 378 | /* The first syscall location stores total syscall number */ |
| 379 | lwi r3, r0, syscall_debug_table |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 380 | addi r3, r3, 1 |
Michal Simek | d8748e7 | 2011-01-31 15:04:43 +0100 | [diff] [blame] | 381 | swi r3, r0, syscall_debug_table |
| 382 | lwi r3, r12, syscall_debug_table |
| 383 | addi r3, r3, 1 |
| 384 | swi r3, r12, syscall_debug_table |
Michal Simek | 11d5136 | 2009-12-07 08:21:34 +0100 | [diff] [blame] | 385 | #endif |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 386 | |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 387 | # Find and jump into the syscall handler. |
| 388 | lwi r12, r12, sys_call_table |
| 389 | /* where the trap should return need -8 to adjust for rtsd r15, 8 */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 390 | addi r15, r0, ret_from_trap-8 |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 391 | bra r12 |
| 392 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 393 | /* The syscall number is invalid, return an error. */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 394 | 5: |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 395 | rtsd r15, 8; /* looks like a normal subroutine return */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 396 | addi r3, r0, -ENOSYS; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 397 | |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 398 | /* Entry point used to return from a syscall/trap */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 399 | /* We re-enable BIP bit before state restore */ |
| 400 | C_ENTRY(ret_from_trap): |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 401 | swi r3, r1, PT_R3 |
| 402 | swi r4, r1, PT_R4 |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 403 | |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 404 | lwi r11, r1, PT_MODE; |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 405 | /* See if returning to kernel mode, if so, skip resched &c. */ |
| 406 | bnei r11, 2f; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 407 | /* We're returning to user mode, so check for various conditions that |
| 408 | * trigger rescheduling. */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 409 | /* FIXME: Restructure all these flag checks. */ |
| 410 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 411 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 412 | andi r11, r11, _TIF_WORK_SYSCALL_MASK |
| 413 | beqi r11, 1f |
| 414 | |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 415 | brlid r15, do_syscall_trace_leave |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 416 | addik r5, r1, PT_R0 |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 417 | 1: |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 418 | /* We're returning to user mode, so check for various conditions that |
| 419 | * trigger rescheduling. */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 420 | /* get thread info from current task */ |
| 421 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 422 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 423 | andi r11, r11, _TIF_NEED_RESCHED; |
| 424 | beqi r11, 5f; |
| 425 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 426 | bralid r15, schedule; /* Call scheduler */ |
| 427 | nop; /* delay slot */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 428 | |
| 429 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 430 | 5: /* get thread info from current task*/ |
| 431 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 432 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
Al Viro | 969a961 | 2012-04-24 02:03:06 -0400 | [diff] [blame] | 433 | andi r11, r11, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 434 | beqi r11, 1f; /* Signals to handle, handle them */ |
| 435 | |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 436 | addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */ |
Al Viro | 969a961 | 2012-04-24 02:03:06 -0400 | [diff] [blame] | 437 | bralid r15, do_notify_resume; /* Handle any signals */ |
Al Viro | 8314019 | 2012-04-24 02:21:18 -0400 | [diff] [blame] | 438 | addi r6, r0, 1; /* Arg 2: int in_syscall */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 439 | |
| 440 | /* Finally, return to user state. */ |
Michal Simek | 96014cc | 2010-06-22 14:05:43 +0200 | [diff] [blame] | 441 | 1: set_bip; /* Ints masked for state restore */ |
Michal Simek | 8633beb | 2010-02-22 13:24:43 +0100 | [diff] [blame] | 442 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 443 | VM_OFF; |
| 444 | tophys(r1,r1); |
| 445 | RESTORE_REGS; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 446 | addik r1, r1, PT_SIZE /* Clean up stack space. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 447 | lwi r1, r1, PT_R1 - PT_SIZE;/* Restore user stack pointer. */ |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 448 | bri 6f; |
| 449 | |
| 450 | /* Return to kernel state. */ |
| 451 | 2: set_bip; /* Ints masked for state restore */ |
| 452 | VM_OFF; |
| 453 | tophys(r1,r1); |
| 454 | RESTORE_REGS; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 455 | addik r1, r1, PT_SIZE /* Clean up stack space. */ |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 456 | tovirt(r1,r1); |
| 457 | 6: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 458 | TRAP_return: /* Make global symbol for debugging */ |
| 459 | rtbd r14, 0; /* Instructions to return from an IRQ */ |
| 460 | nop; |
| 461 | |
| 462 | |
| 463 | /* These syscalls need access to the struct pt_regs on the stack, so we |
| 464 | implement them in assembly (they're basically all wrappers anyway). */ |
| 465 | |
| 466 | C_ENTRY(sys_fork_wrapper): |
| 467 | addi r5, r0, SIGCHLD /* Arg 0: flags */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 468 | lwi r6, r1, PT_R1 /* Arg 1: child SP (use parent's) */ |
| 469 | addik r7, r1, 0 /* Arg 2: parent context */ |
Michal Simek | 5dbeaad | 2011-12-22 14:57:13 +0100 | [diff] [blame] | 470 | add r8, r0, r0 /* Arg 3: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 471 | add r9, r0, r0; /* Arg 4: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 472 | brid do_fork /* Do real work (tail-call) */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 473 | add r10, r0, r0; /* Arg 5: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 474 | |
| 475 | /* This the initial entry point for a new child thread, with an appropriate |
| 476 | stack in place that makes it look the the child is in the middle of an |
| 477 | syscall. This function is actually `returned to' from switch_thread |
| 478 | (copy_thread makes ret_from_fork the return address in each new thread's |
| 479 | saved context). */ |
| 480 | C_ENTRY(ret_from_fork): |
| 481 | bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ |
| 482 | add r3, r5, r0; /* switch_thread returns the prev task */ |
| 483 | /* ( in the delay slot ) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 484 | brid ret_from_trap; /* Do normal trap return */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 485 | add r3, r0, r0; /* Child's fork call should return 0. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 486 | |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 487 | C_ENTRY(sys_vfork): |
| 488 | brid microblaze_vfork /* Do real work (tail-call) */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 489 | addik r5, r1, 0 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 490 | |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 491 | C_ENTRY(sys_clone): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 492 | bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 493 | lwi r6, r1, PT_R1; /* If so, use paret's stack ptr */ |
| 494 | 1: addik r7, r1, 0; /* Arg 2: parent context */ |
Edgar E. Iglesias | 8d95e12 | 2012-02-24 14:52:26 +1000 | [diff] [blame] | 495 | lwi r9, r1, PT_R8; /* parent tid. */ |
| 496 | lwi r10, r1, PT_R9; /* child tid. */ |
| 497 | /* do_fork will pick up TLS from regs->r10. */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 498 | brid do_fork /* Do real work (tail-call) */ |
Edgar E. Iglesias | 8d95e12 | 2012-02-24 14:52:26 +1000 | [diff] [blame] | 499 | add r8, r0, r0; /* Arg 3: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 500 | |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 501 | C_ENTRY(sys_execve): |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 502 | brid microblaze_execve; /* Do real work (tail-call).*/ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 503 | addik r8, r1, 0; /* add user context as 4th arg */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 504 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 505 | C_ENTRY(sys_rt_sigreturn_wrapper): |
Michal Simek | 791d0a1 | 2010-08-06 10:36:02 +0200 | [diff] [blame] | 506 | brid sys_rt_sigreturn /* Do real work */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 507 | addik r5, r1, 0; /* add user context as 1st arg */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 508 | |
| 509 | /* |
| 510 | * HW EXCEPTION rutine start |
| 511 | */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 512 | C_ENTRY(full_exception_trap): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 513 | /* adjust exception address for privileged instruction |
| 514 | * for finding where is it */ |
| 515 | addik r17, r17, -4 |
| 516 | SAVE_STATE /* Save registers */ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 517 | /* PC, before IRQ/trap - this is one instruction above */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 518 | swi r17, r1, PT_PC; |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 519 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 520 | /* FIXME this can be store directly in PT_ESR reg. |
| 521 | * I tested it but there is a fault */ |
| 522 | /* where the trap should return need -8 to adjust for rtsd r15, 8 */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 523 | addik r15, r0, ret_from_exc - 8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 524 | mfs r6, resr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 525 | mfs r7, rfsr; /* save FSR */ |
Michal Simek | 131e4e9 | 2009-09-28 08:50:53 +0200 | [diff] [blame] | 526 | mts rfsr, r0; /* Clear sticky fsr */ |
Michal Simek | c318d48 | 2010-06-22 16:25:31 +0200 | [diff] [blame] | 527 | rted r0, full_exception |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 528 | addik r5, r1, 0 /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 529 | |
| 530 | /* |
| 531 | * Unaligned data trap. |
| 532 | * |
| 533 | * Unaligned data trap last on 4k page is handled here. |
| 534 | * |
| 535 | * Trap entered via exception, so EE bit is set, and interrupts |
| 536 | * are masked. This is nice, means we don't have to CLI before state save |
| 537 | * |
| 538 | * The assembler routine is in "arch/microblaze/kernel/hw_exception_handler.S" |
| 539 | */ |
| 540 | C_ENTRY(unaligned_data_trap): |
Michal Simek | 8b110d1 | 2010-06-17 16:03:05 +0200 | [diff] [blame] | 541 | /* MS: I have to save r11 value and then restore it because |
| 542 | * set_bit, clear_eip, set_ee use r11 as temp register if MSR |
| 543 | * instructions are not used. We don't need to do if MSR instructions |
| 544 | * are used and they use r0 instead of r11. |
| 545 | * I am using ENTRY_SP which should be primary used only for stack |
| 546 | * pointer saving. */ |
| 547 | swi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
| 548 | set_bip; /* equalize initial state for all possible entries */ |
| 549 | clear_eip; |
| 550 | set_ee; |
| 551 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 552 | SAVE_STATE /* Save registers.*/ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 553 | /* PC, before IRQ/trap - this is one instruction above */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 554 | swi r17, r1, PT_PC; |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 555 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 556 | /* where the trap should return need -8 to adjust for rtsd r15, 8 */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 557 | addik r15, r0, ret_from_exc-8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 558 | mfs r3, resr /* ESR */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 559 | mfs r4, rear /* EAR */ |
Michal Simek | c318d48 | 2010-06-22 16:25:31 +0200 | [diff] [blame] | 560 | rtbd r0, _unaligned_data_exception |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 561 | addik r7, r1, 0 /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 562 | |
| 563 | /* |
| 564 | * Page fault traps. |
| 565 | * |
| 566 | * If the real exception handler (from hw_exception_handler.S) didn't find |
| 567 | * the mapping for the process, then we're thrown here to handle such situation. |
| 568 | * |
| 569 | * Trap entered via exceptions, so EE bit is set, and interrupts |
| 570 | * are masked. This is nice, means we don't have to CLI before state save |
| 571 | * |
| 572 | * Build a standard exception frame for TLB Access errors. All TLB exceptions |
| 573 | * will bail out to this point if they can't resolve the lightweight TLB fault. |
| 574 | * |
| 575 | * The C function called is in "arch/microblaze/mm/fault.c", declared as: |
| 576 | * void do_page_fault(struct pt_regs *regs, |
| 577 | * unsigned long address, |
| 578 | * unsigned long error_code) |
| 579 | */ |
| 580 | /* data and intruction trap - which is choose is resolved int fault.c */ |
| 581 | C_ENTRY(page_fault_data_trap): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 582 | SAVE_STATE /* Save registers.*/ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 583 | /* PC, before IRQ/trap - this is one instruction above */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 584 | swi r17, r1, PT_PC; |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 585 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 586 | /* where the trap should return need -8 to adjust for rtsd r15, 8 */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 587 | addik r15, r0, ret_from_exc-8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 588 | mfs r6, rear /* parameter unsigned long address */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 589 | mfs r7, resr /* parameter unsigned long error_code */ |
Michal Simek | c318d48 | 2010-06-22 16:25:31 +0200 | [diff] [blame] | 590 | rted r0, do_page_fault |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 591 | addik r5, r1, 0 /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 592 | |
| 593 | C_ENTRY(page_fault_instr_trap): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 594 | SAVE_STATE /* Save registers.*/ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 595 | /* PC, before IRQ/trap - this is one instruction above */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 596 | swi r17, r1, PT_PC; |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 597 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 598 | /* where the trap should return need -8 to adjust for rtsd r15, 8 */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 599 | addik r15, r0, ret_from_exc-8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 600 | mfs r6, rear /* parameter unsigned long address */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 601 | ori r7, r0, 0 /* parameter unsigned long error_code */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 602 | rted r0, do_page_fault |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 603 | addik r5, r1, 0 /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 604 | |
| 605 | /* Entry point used to return from an exception. */ |
| 606 | C_ENTRY(ret_from_exc): |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 607 | lwi r11, r1, PT_MODE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 608 | bnei r11, 2f; /* See if returning to kernel mode, */ |
| 609 | /* ... if so, skip resched &c. */ |
| 610 | |
| 611 | /* We're returning to user mode, so check for various conditions that |
| 612 | trigger rescheduling. */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 613 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 614 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 615 | andi r11, r11, _TIF_NEED_RESCHED; |
| 616 | beqi r11, 5f; |
| 617 | |
| 618 | /* Call the scheduler before returning from a syscall/trap. */ |
| 619 | bralid r15, schedule; /* Call scheduler */ |
| 620 | nop; /* delay slot */ |
| 621 | |
| 622 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 623 | 5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 624 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
Al Viro | 969a961 | 2012-04-24 02:03:06 -0400 | [diff] [blame] | 625 | andi r11, r11, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 626 | beqi r11, 1f; /* Signals to handle, handle them */ |
| 627 | |
| 628 | /* |
| 629 | * Handle a signal return; Pending signals should be in r18. |
| 630 | * |
| 631 | * Not all registers are saved by the normal trap/interrupt entry |
| 632 | * points (for instance, call-saved registers (because the normal |
| 633 | * C-compiler calling sequence in the kernel makes sure they're |
| 634 | * preserved), and call-clobbered registers in the case of |
| 635 | * traps), but signal handlers may want to examine or change the |
| 636 | * complete register state. Here we save anything not saved by |
| 637 | * the normal entry sequence, so that it may be safely restored |
Al Viro | 969a961 | 2012-04-24 02:03:06 -0400 | [diff] [blame] | 638 | * (in a possibly modified form) after do_notify_resume returns. */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 639 | addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */ |
Al Viro | 969a961 | 2012-04-24 02:03:06 -0400 | [diff] [blame] | 640 | bralid r15, do_notify_resume; /* Handle any signals */ |
Al Viro | 8314019 | 2012-04-24 02:21:18 -0400 | [diff] [blame] | 641 | addi r6, r0, 0; /* Arg 2: int in_syscall */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 642 | |
| 643 | /* Finally, return to user state. */ |
Michal Simek | 96014cc | 2010-06-22 14:05:43 +0200 | [diff] [blame] | 644 | 1: set_bip; /* Ints masked for state restore */ |
Michal Simek | 8633beb | 2010-02-22 13:24:43 +0100 | [diff] [blame] | 645 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 646 | VM_OFF; |
| 647 | tophys(r1,r1); |
| 648 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 649 | RESTORE_REGS; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 650 | addik r1, r1, PT_SIZE /* Clean up stack space. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 651 | |
| 652 | lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer. */ |
| 653 | bri 6f; |
| 654 | /* Return to kernel state. */ |
Michal Simek | 96014cc | 2010-06-22 14:05:43 +0200 | [diff] [blame] | 655 | 2: set_bip; /* Ints masked for state restore */ |
| 656 | VM_OFF; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 657 | tophys(r1,r1); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 658 | RESTORE_REGS; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 659 | addik r1, r1, PT_SIZE /* Clean up stack space. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 660 | |
| 661 | tovirt(r1,r1); |
| 662 | 6: |
| 663 | EXC_return: /* Make global symbol for debugging */ |
| 664 | rtbd r14, 0; /* Instructions to return from an IRQ */ |
| 665 | nop; |
| 666 | |
| 667 | /* |
| 668 | * HW EXCEPTION rutine end |
| 669 | */ |
| 670 | |
| 671 | /* |
| 672 | * Hardware maskable interrupts. |
| 673 | * |
| 674 | * The stack-pointer (r1) should have already been saved to the memory |
| 675 | * location PER_CPU(ENTRY_SP). |
| 676 | */ |
| 677 | C_ENTRY(_interrupt): |
| 678 | /* MS: we are in physical address */ |
| 679 | /* Save registers, switch to proper stack, convert SP to virtual.*/ |
| 680 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 681 | /* MS: See if already in kernel mode. */ |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 682 | mfs r1, rmsr |
Michal Simek | 5c0d72b | 2010-06-22 14:00:12 +0200 | [diff] [blame] | 683 | nop |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 684 | andi r1, r1, MSR_UMS |
| 685 | bnei r1, 1f |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 686 | |
| 687 | /* Kernel-mode state save. */ |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 688 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) |
| 689 | tophys(r1,r1); /* MS: I have in r1 physical address where stack is */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 690 | /* save registers */ |
| 691 | /* MS: Make room on the stack -> activation record */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 692 | addik r1, r1, -PT_SIZE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 693 | SAVE_REGS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 694 | brid 2f; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 695 | swi r1, r1, PT_MODE; /* 0 - user mode, 1 - kernel mode */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 696 | 1: |
| 697 | /* User-mode state save. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 698 | /* MS: get the saved current */ |
| 699 | lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
| 700 | tophys(r1,r1); |
| 701 | lwi r1, r1, TS_THREAD_INFO; |
| 702 | addik r1, r1, THREAD_SIZE; |
| 703 | tophys(r1,r1); |
| 704 | /* save registers */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 705 | addik r1, r1, -PT_SIZE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 706 | SAVE_REGS |
| 707 | /* calculate mode */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 708 | swi r0, r1, PT_MODE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 709 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 710 | swi r11, r1, PT_R1; |
Michal Simek | 80c5ff6 | 2010-06-22 18:50:31 +0200 | [diff] [blame] | 711 | clear_ums; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 712 | 2: |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 713 | lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 714 | tovirt(r1,r1) |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 715 | addik r15, r0, irq_call; |
Michal Simek | 80c5ff6 | 2010-06-22 18:50:31 +0200 | [diff] [blame] | 716 | irq_call:rtbd r0, do_IRQ; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 717 | addik r5, r1, 0; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 718 | |
| 719 | /* MS: we are in virtual mode */ |
| 720 | ret_from_irq: |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 721 | lwi r11, r1, PT_MODE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 722 | bnei r11, 2f; |
| 723 | |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 724 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 725 | lwi r11, r11, TI_FLAGS; /* MS: get flags from thread info */ |
| 726 | andi r11, r11, _TIF_NEED_RESCHED; |
| 727 | beqi r11, 5f |
| 728 | bralid r15, schedule; |
| 729 | nop; /* delay slot */ |
| 730 | |
| 731 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 732 | 5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* MS: get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 733 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
Al Viro | 969a961 | 2012-04-24 02:03:06 -0400 | [diff] [blame] | 734 | andi r11, r11, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 735 | beqid r11, no_intr_resched |
| 736 | /* Handle a signal return; Pending signals should be in r18. */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 737 | addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */ |
Al Viro | 969a961 | 2012-04-24 02:03:06 -0400 | [diff] [blame] | 738 | bralid r15, do_notify_resume; /* Handle any signals */ |
Al Viro | 8314019 | 2012-04-24 02:21:18 -0400 | [diff] [blame] | 739 | addi r6, r0, 0; /* Arg 2: int in_syscall */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 740 | |
| 741 | /* Finally, return to user state. */ |
| 742 | no_intr_resched: |
| 743 | /* Disable interrupts, we are now committed to the state restore */ |
| 744 | disable_irq |
Michal Simek | 8633beb | 2010-02-22 13:24:43 +0100 | [diff] [blame] | 745 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 746 | VM_OFF; |
| 747 | tophys(r1,r1); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 748 | RESTORE_REGS |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 749 | addik r1, r1, PT_SIZE /* MS: Clean up stack space. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 750 | lwi r1, r1, PT_R1 - PT_SIZE; |
| 751 | bri 6f; |
| 752 | /* MS: Return to kernel state. */ |
Michal Simek | 7775379 | 2010-01-12 09:55:10 +0100 | [diff] [blame] | 753 | 2: |
| 754 | #ifdef CONFIG_PREEMPT |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 755 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | 7775379 | 2010-01-12 09:55:10 +0100 | [diff] [blame] | 756 | /* MS: get preempt_count from thread info */ |
| 757 | lwi r5, r11, TI_PREEMPT_COUNT; |
| 758 | bgti r5, restore; |
| 759 | |
| 760 | lwi r5, r11, TI_FLAGS; /* get flags in thread info */ |
| 761 | andi r5, r5, _TIF_NEED_RESCHED; |
| 762 | beqi r5, restore /* if zero jump over */ |
| 763 | |
| 764 | preempt: |
| 765 | /* interrupts are off that's why I am calling preempt_chedule_irq */ |
| 766 | bralid r15, preempt_schedule_irq |
| 767 | nop |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 768 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | 7775379 | 2010-01-12 09:55:10 +0100 | [diff] [blame] | 769 | lwi r5, r11, TI_FLAGS; /* get flags in thread info */ |
| 770 | andi r5, r5, _TIF_NEED_RESCHED; |
| 771 | bnei r5, preempt /* if non zero jump to resched */ |
| 772 | restore: |
| 773 | #endif |
| 774 | VM_OFF /* MS: turn off MMU */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 775 | tophys(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 776 | RESTORE_REGS |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 777 | addik r1, r1, PT_SIZE /* MS: Clean up stack space. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 778 | tovirt(r1,r1); |
| 779 | 6: |
| 780 | IRQ_return: /* MS: Make global symbol for debugging */ |
| 781 | rtid r14, 0 |
| 782 | nop |
| 783 | |
| 784 | /* |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 785 | * Debug trap for KGDB. Enter to _debug_exception by brki r16, 0x18 |
| 786 | * and call handling function with saved pt_regs |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 787 | */ |
| 788 | C_ENTRY(_debug_exception): |
| 789 | /* BIP bit is set on entry, no interrupts can occur */ |
| 790 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) |
| 791 | |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 792 | mfs r1, rmsr |
Michal Simek | 5c0d72b | 2010-06-22 14:00:12 +0200 | [diff] [blame] | 793 | nop |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 794 | andi r1, r1, MSR_UMS |
| 795 | bnei r1, 1f |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 796 | /* MS: Kernel-mode state save - kgdb */ |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 797 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 798 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 799 | /* BIP bit is set on entry, no interrupts can occur */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 800 | addik r1, r1, CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - PT_SIZE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 801 | SAVE_REGS; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 802 | /* save all regs to pt_reg structure */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 803 | swi r0, r1, PT_R0; /* R0 must be saved too */ |
| 804 | swi r14, r1, PT_R14 /* rewrite saved R14 value */ |
| 805 | swi r16, r1, PT_PC; /* PC and r16 are the same */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 806 | /* save special purpose registers to pt_regs */ |
| 807 | mfs r11, rear; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 808 | swi r11, r1, PT_EAR; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 809 | mfs r11, resr; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 810 | swi r11, r1, PT_ESR; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 811 | mfs r11, rfsr; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 812 | swi r11, r1, PT_FSR; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 813 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 814 | /* stack pointer is in physical address at it is decrease |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 815 | * by PT_SIZE but we need to get correct R1 value */ |
| 816 | addik r11, r1, CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR + PT_SIZE; |
| 817 | swi r11, r1, PT_R1 |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 818 | /* MS: r31 - current pointer isn't changed */ |
| 819 | tovirt(r1,r1) |
| 820 | #ifdef CONFIG_KGDB |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 821 | addi r5, r1, 0 /* pass pt_reg address as the first arg */ |
Michal Simek | cd34157 | 2011-02-01 09:00:57 +0100 | [diff] [blame] | 822 | addik r15, r0, dbtrap_call; /* return address */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 823 | rtbd r0, microblaze_kgdb_break |
| 824 | nop; |
| 825 | #endif |
| 826 | /* MS: Place handler for brki from kernel space if KGDB is OFF. |
| 827 | * It is very unlikely that another brki instruction is called. */ |
| 828 | bri 0 |
| 829 | |
| 830 | /* MS: User-mode state save - gdb */ |
| 831 | 1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 832 | tophys(r1,r1); |
| 833 | lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ |
| 834 | addik r1, r1, THREAD_SIZE; /* calculate kernel stack pointer */ |
| 835 | tophys(r1,r1); |
| 836 | |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 837 | addik r1, r1, -PT_SIZE; /* Make room on the stack. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 838 | SAVE_REGS; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 839 | swi r16, r1, PT_PC; /* Save LP */ |
| 840 | swi r0, r1, PT_MODE; /* Was in user-mode. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 841 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 842 | swi r11, r1, PT_R1; /* Store user SP. */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 843 | lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 844 | tovirt(r1,r1) |
Michal Simek | 06b2864 | 2010-06-22 15:25:24 +0200 | [diff] [blame] | 845 | set_vms; |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 846 | addik r5, r1, 0; |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 847 | addik r15, r0, dbtrap_call; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 848 | dbtrap_call: /* Return point for kernel/user entry + 8 because of rtsd r15, 8 */ |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 849 | rtbd r0, sw_exception |
| 850 | nop |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 851 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 852 | /* MS: The first instruction for the second part of the gdb/kgdb */ |
| 853 | set_bip; /* Ints masked for state restore */ |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 854 | lwi r11, r1, PT_MODE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 855 | bnei r11, 2f; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 856 | /* MS: Return to user space - gdb */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 857 | /* Get current task ptr into r11 */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 858 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 859 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 860 | andi r11, r11, _TIF_NEED_RESCHED; |
| 861 | beqi r11, 5f; |
| 862 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 863 | /* Call the scheduler before returning from a syscall/trap. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 864 | bralid r15, schedule; /* Call scheduler */ |
| 865 | nop; /* delay slot */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 866 | |
| 867 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 868 | 5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 869 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
Al Viro | 969a961 | 2012-04-24 02:03:06 -0400 | [diff] [blame] | 870 | andi r11, r11, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 871 | beqi r11, 1f; /* Signals to handle, handle them */ |
| 872 | |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 873 | addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */ |
Al Viro | 969a961 | 2012-04-24 02:03:06 -0400 | [diff] [blame] | 874 | bralid r15, do_notify_resume; /* Handle any signals */ |
Al Viro | 8314019 | 2012-04-24 02:21:18 -0400 | [diff] [blame] | 875 | addi r6, r0, 0; /* Arg 2: int in_syscall */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 876 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 877 | /* Finally, return to user state. */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 878 | 1: swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 879 | VM_OFF; |
| 880 | tophys(r1,r1); |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 881 | /* MS: Restore all regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 882 | RESTORE_REGS |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 883 | addik r1, r1, PT_SIZE /* Clean up stack space */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 884 | lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer */ |
| 885 | DBTRAP_return_user: /* MS: Make global symbol for debugging */ |
| 886 | rtbd r16, 0; /* MS: Instructions to return from a debug trap */ |
| 887 | nop; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 888 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 889 | /* MS: Return to kernel state - kgdb */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 890 | 2: VM_OFF; |
| 891 | tophys(r1,r1); |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 892 | /* MS: Restore all regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 893 | RESTORE_REGS |
Michal Simek | 6e83557 | 2011-01-31 15:10:04 +0100 | [diff] [blame] | 894 | lwi r14, r1, PT_R14; |
| 895 | lwi r16, r1, PT_PC; |
| 896 | addik r1, r1, PT_SIZE; /* MS: Clean up stack space */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 897 | tovirt(r1,r1); |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 898 | DBTRAP_return_kernel: /* MS: Make global symbol for debugging */ |
| 899 | rtbd r16, 0; /* MS: Instructions to return from a debug trap */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 900 | nop; |
| 901 | |
| 902 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 903 | ENTRY(_switch_to) |
| 904 | /* prepare return value */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 905 | addk r3, r0, CURRENT_TASK |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 906 | |
| 907 | /* save registers in cpu_context */ |
| 908 | /* use r11 and r12, volatile registers, as temp register */ |
| 909 | /* give start of cpu_context for previous process */ |
| 910 | addik r11, r5, TI_CPU_CONTEXT |
| 911 | swi r1, r11, CC_R1 |
| 912 | swi r2, r11, CC_R2 |
| 913 | /* skip volatile registers. |
| 914 | * they are saved on stack when we jumped to _switch_to() */ |
| 915 | /* dedicated registers */ |
| 916 | swi r13, r11, CC_R13 |
| 917 | swi r14, r11, CC_R14 |
| 918 | swi r15, r11, CC_R15 |
| 919 | swi r16, r11, CC_R16 |
| 920 | swi r17, r11, CC_R17 |
| 921 | swi r18, r11, CC_R18 |
| 922 | /* save non-volatile registers */ |
| 923 | swi r19, r11, CC_R19 |
| 924 | swi r20, r11, CC_R20 |
| 925 | swi r21, r11, CC_R21 |
| 926 | swi r22, r11, CC_R22 |
| 927 | swi r23, r11, CC_R23 |
| 928 | swi r24, r11, CC_R24 |
| 929 | swi r25, r11, CC_R25 |
| 930 | swi r26, r11, CC_R26 |
| 931 | swi r27, r11, CC_R27 |
| 932 | swi r28, r11, CC_R28 |
| 933 | swi r29, r11, CC_R29 |
| 934 | swi r30, r11, CC_R30 |
| 935 | /* special purpose registers */ |
| 936 | mfs r12, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 937 | swi r12, r11, CC_MSR |
| 938 | mfs r12, rear |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 939 | swi r12, r11, CC_EAR |
| 940 | mfs r12, resr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 941 | swi r12, r11, CC_ESR |
| 942 | mfs r12, rfsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 943 | swi r12, r11, CC_FSR |
| 944 | |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 945 | /* update r31, the current-give me pointer to task which will be next */ |
| 946 | lwi CURRENT_TASK, r6, TI_TASK |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 947 | /* stored it to current_save too */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 948 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 949 | |
| 950 | /* get new process' cpu context and restore */ |
| 951 | /* give me start where start context of next task */ |
| 952 | addik r11, r6, TI_CPU_CONTEXT |
| 953 | |
| 954 | /* non-volatile registers */ |
| 955 | lwi r30, r11, CC_R30 |
| 956 | lwi r29, r11, CC_R29 |
| 957 | lwi r28, r11, CC_R28 |
| 958 | lwi r27, r11, CC_R27 |
| 959 | lwi r26, r11, CC_R26 |
| 960 | lwi r25, r11, CC_R25 |
| 961 | lwi r24, r11, CC_R24 |
| 962 | lwi r23, r11, CC_R23 |
| 963 | lwi r22, r11, CC_R22 |
| 964 | lwi r21, r11, CC_R21 |
| 965 | lwi r20, r11, CC_R20 |
| 966 | lwi r19, r11, CC_R19 |
| 967 | /* dedicated registers */ |
| 968 | lwi r18, r11, CC_R18 |
| 969 | lwi r17, r11, CC_R17 |
| 970 | lwi r16, r11, CC_R16 |
| 971 | lwi r15, r11, CC_R15 |
| 972 | lwi r14, r11, CC_R14 |
| 973 | lwi r13, r11, CC_R13 |
| 974 | /* skip volatile registers */ |
| 975 | lwi r2, r11, CC_R2 |
| 976 | lwi r1, r11, CC_R1 |
| 977 | |
| 978 | /* special purpose registers */ |
| 979 | lwi r12, r11, CC_FSR |
| 980 | mts rfsr, r12 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 981 | lwi r12, r11, CC_MSR |
| 982 | mts rmsr, r12 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 983 | |
| 984 | rtsd r15, 8 |
| 985 | nop |
| 986 | |
| 987 | ENTRY(_reset) |
Michal Simek | 7574349 | 2011-03-10 10:56:21 +0100 | [diff] [blame] | 988 | brai 0; /* Jump to reset vector */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 989 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 990 | /* These are compiled and loaded into high memory, then |
| 991 | * copied into place in mach_early_setup */ |
| 992 | .section .init.ivt, "ax" |
Michal Simek | 0b9b020 | 2010-11-08 12:37:40 +0100 | [diff] [blame] | 993 | #if CONFIG_MANUAL_RESET_VECTOR |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 994 | .org 0x0 |
Michal Simek | 0b9b020 | 2010-11-08 12:37:40 +0100 | [diff] [blame] | 995 | brai CONFIG_MANUAL_RESET_VECTOR |
| 996 | #endif |
Michal Simek | 626afa3 | 2011-03-10 10:51:27 +0100 | [diff] [blame] | 997 | .org 0x8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 998 | brai TOPHYS(_user_exception); /* syscall handler */ |
Michal Simek | 626afa3 | 2011-03-10 10:51:27 +0100 | [diff] [blame] | 999 | .org 0x10 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 1000 | brai TOPHYS(_interrupt); /* Interrupt handler */ |
Michal Simek | 626afa3 | 2011-03-10 10:51:27 +0100 | [diff] [blame] | 1001 | .org 0x18 |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 1002 | brai TOPHYS(_debug_exception); /* debug trap handler */ |
Michal Simek | 626afa3 | 2011-03-10 10:51:27 +0100 | [diff] [blame] | 1003 | .org 0x20 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 1004 | brai TOPHYS(_hw_exception_handler); /* HW exception handler */ |
| 1005 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 1006 | .section .rodata,"a" |
| 1007 | #include "syscall_table.S" |
| 1008 | |
| 1009 | syscall_table_size=(.-sys_call_table) |
| 1010 | |
Steven J. Magnani | ce3266c | 2010-04-27 12:37:54 -0500 | [diff] [blame] | 1011 | type_SYSCALL: |
| 1012 | .ascii "SYSCALL\0" |
| 1013 | type_IRQ: |
| 1014 | .ascii "IRQ\0" |
| 1015 | type_IRQ_PREEMPT: |
| 1016 | .ascii "IRQ (PREEMPTED)\0" |
| 1017 | type_SYSCALL_PREEMPT: |
| 1018 | .ascii " SYSCALL (PREEMPTED)\0" |
| 1019 | |
| 1020 | /* |
| 1021 | * Trap decoding for stack unwinder |
| 1022 | * Tuples are (start addr, end addr, string) |
| 1023 | * If return address lies on [start addr, end addr], |
| 1024 | * unwinder displays 'string' |
| 1025 | */ |
| 1026 | |
| 1027 | .align 4 |
| 1028 | .global microblaze_trap_handlers |
| 1029 | microblaze_trap_handlers: |
| 1030 | /* Exact matches come first */ |
| 1031 | .word ret_from_trap; .word ret_from_trap ; .word type_SYSCALL |
| 1032 | .word ret_from_irq ; .word ret_from_irq ; .word type_IRQ |
| 1033 | /* Fuzzy matches go here */ |
| 1034 | .word ret_from_irq ; .word no_intr_resched ; .word type_IRQ_PREEMPT |
| 1035 | .word ret_from_trap; .word TRAP_return ; .word type_SYSCALL_PREEMPT |
| 1036 | /* End of table */ |
| 1037 | .word 0 ; .word 0 ; .word 0 |