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 | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 36 | /* The size of a state save frame. */ |
| 37 | #define STATE_SAVE_SIZE (PT_SIZE + STATE_SAVE_ARG_SPACE) |
| 38 | |
| 39 | /* The offset of the struct pt_regs in a `state save frame' on the stack. */ |
| 40 | #define PTO STATE_SAVE_ARG_SPACE /* 24 the space for args */ |
| 41 | |
Michal Simek | d8748e7 | 2011-01-31 15:04:43 +0100 | [diff] [blame^] | 42 | #ifdef DEBUG |
| 43 | /* Create space for syscalls counting. */ |
| 44 | .section .data |
| 45 | .global syscall_debug_table |
| 46 | .align 4 |
| 47 | syscall_debug_table: |
| 48 | .space (__NR_syscalls * 4) |
| 49 | #endif /* DEBUG */ |
| 50 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 51 | #define C_ENTRY(name) .globl name; .align 4; name |
| 52 | |
| 53 | /* |
| 54 | * Various ways of setting and clearing BIP in flags reg. |
| 55 | * This is mucky, but necessary using microblaze version that |
| 56 | * allows msr ops to write to BIP |
| 57 | */ |
| 58 | #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR |
| 59 | .macro clear_bip |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 60 | msrclr r0, MSR_BIP |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 61 | .endm |
| 62 | |
| 63 | .macro set_bip |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 64 | msrset r0, MSR_BIP |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 65 | .endm |
| 66 | |
| 67 | .macro clear_eip |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 68 | msrclr r0, MSR_EIP |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 69 | .endm |
| 70 | |
| 71 | .macro set_ee |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 72 | msrset r0, MSR_EE |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 73 | .endm |
| 74 | |
| 75 | .macro disable_irq |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 76 | msrclr r0, MSR_IE |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 77 | .endm |
| 78 | |
| 79 | .macro enable_irq |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 80 | msrset r0, MSR_IE |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 81 | .endm |
| 82 | |
| 83 | .macro set_ums |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 84 | msrset r0, MSR_UMS |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 85 | msrclr r0, MSR_VMS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 86 | .endm |
| 87 | |
| 88 | .macro set_vms |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 89 | msrclr r0, MSR_UMS |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 90 | msrset r0, MSR_VMS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 91 | .endm |
| 92 | |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 93 | .macro clear_ums |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 94 | msrclr r0, MSR_UMS |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 95 | .endm |
| 96 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 97 | .macro clear_vms_ums |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 98 | msrclr r0, MSR_VMS | MSR_UMS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 99 | .endm |
| 100 | #else |
| 101 | .macro clear_bip |
| 102 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 103 | andi 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 set_bip |
| 108 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 109 | ori r11, r11, MSR_BIP |
| 110 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 111 | .endm |
| 112 | |
| 113 | .macro clear_eip |
| 114 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 115 | andi r11, r11, ~MSR_EIP |
| 116 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 117 | .endm |
| 118 | |
| 119 | .macro set_ee |
| 120 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 121 | ori r11, r11, MSR_EE |
| 122 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 123 | .endm |
| 124 | |
| 125 | .macro disable_irq |
| 126 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 127 | andi 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 enable_irq |
| 132 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 133 | ori r11, r11, MSR_IE |
| 134 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 135 | .endm |
| 136 | |
| 137 | .macro set_ums |
| 138 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 139 | ori r11, r11, MSR_VMS |
| 140 | andni r11, r11, MSR_UMS |
| 141 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 142 | .endm |
| 143 | |
| 144 | .macro set_vms |
| 145 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 146 | ori r11, r11, MSR_VMS |
| 147 | andni r11, r11, MSR_UMS |
| 148 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 149 | .endm |
| 150 | |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 151 | .macro clear_ums |
| 152 | mfs r11, rmsr |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 153 | andni r11, r11, MSR_UMS |
| 154 | mts rmsr,r11 |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 155 | .endm |
| 156 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 157 | .macro clear_vms_ums |
| 158 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 159 | andni r11, r11, (MSR_VMS|MSR_UMS) |
| 160 | mts rmsr,r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 161 | .endm |
| 162 | #endif |
| 163 | |
| 164 | /* Define how to call high-level functions. With MMU, virtual mode must be |
| 165 | * enabled when calling the high-level function. Clobbers R11. |
| 166 | * VM_ON, VM_OFF, DO_JUMP_BIPCLR, DO_CALL |
| 167 | */ |
| 168 | |
| 169 | /* turn on virtual protected mode save */ |
| 170 | #define VM_ON \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 171 | set_ums; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 172 | rted r0, 2f; \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 173 | nop; \ |
| 174 | 2: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 175 | |
| 176 | /* turn off virtual protected mode save and user mode save*/ |
| 177 | #define VM_OFF \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 178 | clear_vms_ums; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 179 | rted r0, TOPHYS(1f); \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 180 | nop; \ |
| 181 | 1: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 182 | |
| 183 | #define SAVE_REGS \ |
| 184 | swi r2, r1, PTO+PT_R2; /* Save SDA */ \ |
Michal Simek | 36f6095 | 2010-06-22 13:27:43 +0200 | [diff] [blame] | 185 | swi r3, r1, PTO+PT_R3; \ |
| 186 | swi r4, r1, PTO+PT_R4; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 187 | swi r5, r1, PTO+PT_R5; \ |
| 188 | swi r6, r1, PTO+PT_R6; \ |
| 189 | swi r7, r1, PTO+PT_R7; \ |
| 190 | swi r8, r1, PTO+PT_R8; \ |
| 191 | swi r9, r1, PTO+PT_R9; \ |
| 192 | swi r10, r1, PTO+PT_R10; \ |
| 193 | swi r11, r1, PTO+PT_R11; /* save clobbered regs after rval */\ |
| 194 | swi r12, r1, PTO+PT_R12; \ |
| 195 | swi r13, r1, PTO+PT_R13; /* Save SDA2 */ \ |
| 196 | swi r14, r1, PTO+PT_PC; /* PC, before IRQ/trap */ \ |
| 197 | swi r15, r1, PTO+PT_R15; /* Save LP */ \ |
Michal Simek | 600eb61 | 2010-08-09 14:37:42 +0200 | [diff] [blame] | 198 | swi r16, r1, PTO+PT_R16; \ |
| 199 | swi r17, r1, PTO+PT_R17; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 200 | swi r18, r1, PTO+PT_R18; /* Save asm scratch reg */ \ |
| 201 | swi r19, r1, PTO+PT_R19; \ |
| 202 | swi r20, r1, PTO+PT_R20; \ |
| 203 | swi r21, r1, PTO+PT_R21; \ |
| 204 | swi r22, r1, PTO+PT_R22; \ |
| 205 | swi r23, r1, PTO+PT_R23; \ |
| 206 | swi r24, r1, PTO+PT_R24; \ |
| 207 | swi r25, r1, PTO+PT_R25; \ |
| 208 | swi r26, r1, PTO+PT_R26; \ |
| 209 | swi r27, r1, PTO+PT_R27; \ |
| 210 | swi r28, r1, PTO+PT_R28; \ |
| 211 | swi r29, r1, PTO+PT_R29; \ |
| 212 | swi r30, r1, PTO+PT_R30; \ |
| 213 | swi r31, r1, PTO+PT_R31; /* Save current task reg */ \ |
| 214 | mfs r11, rmsr; /* save MSR */ \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 215 | swi r11, r1, PTO+PT_MSR; |
| 216 | |
| 217 | #define RESTORE_REGS \ |
| 218 | lwi r11, r1, PTO+PT_MSR; \ |
| 219 | mts rmsr , r11; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 220 | lwi r2, r1, PTO+PT_R2; /* restore SDA */ \ |
Michal Simek | 36f6095 | 2010-06-22 13:27:43 +0200 | [diff] [blame] | 221 | lwi r3, r1, PTO+PT_R3; \ |
| 222 | lwi r4, r1, PTO+PT_R4; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 223 | lwi r5, r1, PTO+PT_R5; \ |
| 224 | lwi r6, r1, PTO+PT_R6; \ |
| 225 | lwi r7, r1, PTO+PT_R7; \ |
| 226 | lwi r8, r1, PTO+PT_R8; \ |
| 227 | lwi r9, r1, PTO+PT_R9; \ |
| 228 | lwi r10, r1, PTO+PT_R10; \ |
| 229 | lwi r11, r1, PTO+PT_R11; /* restore clobbered regs after rval */\ |
| 230 | lwi r12, r1, PTO+PT_R12; \ |
| 231 | lwi r13, r1, PTO+PT_R13; /* restore SDA2 */ \ |
| 232 | lwi r14, r1, PTO+PT_PC; /* RESTORE_LINK PC, before IRQ/trap */\ |
| 233 | lwi r15, r1, PTO+PT_R15; /* restore LP */ \ |
Michal Simek | 600eb61 | 2010-08-09 14:37:42 +0200 | [diff] [blame] | 234 | lwi r16, r1, PTO+PT_R16; \ |
| 235 | lwi r17, r1, PTO+PT_R17; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 236 | lwi r18, r1, PTO+PT_R18; /* restore asm scratch reg */ \ |
| 237 | lwi r19, r1, PTO+PT_R19; \ |
| 238 | lwi r20, r1, PTO+PT_R20; \ |
| 239 | lwi r21, r1, PTO+PT_R21; \ |
| 240 | lwi r22, r1, PTO+PT_R22; \ |
| 241 | lwi r23, r1, PTO+PT_R23; \ |
| 242 | lwi r24, r1, PTO+PT_R24; \ |
| 243 | lwi r25, r1, PTO+PT_R25; \ |
| 244 | lwi r26, r1, PTO+PT_R26; \ |
| 245 | lwi r27, r1, PTO+PT_R27; \ |
| 246 | lwi r28, r1, PTO+PT_R28; \ |
| 247 | lwi r29, r1, PTO+PT_R29; \ |
| 248 | lwi r30, r1, PTO+PT_R30; \ |
| 249 | lwi r31, r1, PTO+PT_R31; /* Restore cur task reg */ |
| 250 | |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 251 | #define SAVE_STATE \ |
| 252 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* save stack */ \ |
| 253 | /* See if already in kernel mode.*/ \ |
| 254 | mfs r1, rmsr; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 255 | andi r1, r1, MSR_UMS; \ |
| 256 | bnei r1, 1f; \ |
| 257 | /* Kernel-mode state save. */ \ |
| 258 | /* Reload kernel stack-ptr. */ \ |
| 259 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); \ |
Michal Simek | 287503f | 2010-06-22 18:16:07 +0200 | [diff] [blame] | 260 | /* FIXME: I can add these two lines to one */ \ |
| 261 | /* tophys(r1,r1); */ \ |
| 262 | /* addik r1, r1, -STATE_SAVE_SIZE; */ \ |
| 263 | addik r1, r1, CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - STATE_SAVE_SIZE; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 264 | SAVE_REGS \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 265 | brid 2f; \ |
Michal Simek | da23355 | 2010-06-22 18:02:06 +0200 | [diff] [blame] | 266 | swi r1, r1, PTO+PT_MODE; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 267 | 1: /* User-mode state save. */ \ |
| 268 | lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */\ |
| 269 | tophys(r1,r1); \ |
| 270 | lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ \ |
Michal Simek | 287503f | 2010-06-22 18:16:07 +0200 | [diff] [blame] | 271 | /* MS these three instructions can be added to one */ \ |
| 272 | /* addik r1, r1, THREAD_SIZE; */ \ |
| 273 | /* tophys(r1,r1); */ \ |
| 274 | /* addik r1, r1, -STATE_SAVE_SIZE; */ \ |
| 275 | addik r1, r1, THREAD_SIZE + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - STATE_SAVE_SIZE; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 276 | SAVE_REGS \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 277 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); \ |
| 278 | swi r11, r1, PTO+PT_R1; /* Store user SP. */ \ |
Michal Simek | e7741075 | 2010-06-22 18:00:35 +0200 | [diff] [blame] | 279 | swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */ \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 280 | /* MS: I am clearing UMS even in case when I come from kernel space */ \ |
| 281 | clear_ums; \ |
| 282 | 2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
| 283 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 284 | .text |
| 285 | |
| 286 | /* |
| 287 | * User trap. |
| 288 | * |
| 289 | * System calls are handled here. |
| 290 | * |
| 291 | * Syscall protocol: |
| 292 | * Syscall number in r12, args in r5-r10 |
| 293 | * Return value in r3 |
| 294 | * |
| 295 | * Trap entered via brki instruction, so BIP bit is set, and interrupts |
| 296 | * are masked. This is nice, means we don't have to CLI before state save |
| 297 | */ |
| 298 | C_ENTRY(_user_exception): |
Michal Simek | 0e41c90 | 2010-06-22 21:11:49 +0200 | [diff] [blame] | 299 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */ |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 300 | addi r14, r14, 4 /* return address is 4 byte after call */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 301 | |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 302 | mfs r1, rmsr |
| 303 | nop |
| 304 | andi r1, r1, MSR_UMS |
| 305 | bnei r1, 1f |
| 306 | |
| 307 | /* Kernel-mode state save - kernel execve */ |
| 308 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/ |
| 309 | tophys(r1,r1); |
| 310 | |
| 311 | addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ |
| 312 | SAVE_REGS |
| 313 | |
| 314 | swi r1, r1, PTO + PT_MODE; /* pt_regs -> kernel mode */ |
| 315 | brid 2f; |
| 316 | nop; /* Fill delay slot */ |
| 317 | |
| 318 | /* User-mode state save. */ |
| 319 | 1: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 320 | lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ |
| 321 | tophys(r1,r1); |
| 322 | lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */ |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 323 | /* calculate kernel stack pointer from task struct 8k */ |
| 324 | addik r1, r1, THREAD_SIZE; |
| 325 | tophys(r1,r1); |
| 326 | |
| 327 | addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 328 | SAVE_REGS |
Michal Simek | 7d43209 | 2010-08-06 10:42:30 +0200 | [diff] [blame] | 329 | swi r0, r1, PTO + PT_R3 |
| 330 | swi r0, r1, PTO + PT_R4 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 331 | |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 332 | swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 333 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
| 334 | swi r11, r1, PTO+PT_R1; /* Store user SP. */ |
Michal Simek | 25f6e59 | 2010-06-22 18:29:05 +0200 | [diff] [blame] | 335 | clear_ums; |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 336 | 2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 337 | /* Save away the syscall number. */ |
| 338 | swi r12, r1, PTO+PT_R0; |
| 339 | tovirt(r1,r1) |
| 340 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 341 | /* where the trap should return need -8 to adjust for rtsd r15, 8*/ |
| 342 | /* Jump to the appropriate function for the system call number in r12 |
| 343 | * (r12 is not preserved), or return an error if r12 is not valid. The LP |
| 344 | * register should point to the location where |
| 345 | * 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] | 346 | |
Michal Simek | 25f6e59 | 2010-06-22 18:29:05 +0200 | [diff] [blame] | 347 | /* Step into virtual mode */ |
| 348 | rtbd r0, 3f |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 349 | nop |
| 350 | 3: |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 351 | lwi r11, CURRENT_TASK, TS_THREAD_INFO /* get thread info */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 352 | lwi r11, r11, TI_FLAGS /* get flags in thread info */ |
| 353 | andi r11, r11, _TIF_WORK_SYSCALL_MASK |
| 354 | beqi r11, 4f |
| 355 | |
| 356 | addik r3, r0, -ENOSYS |
| 357 | swi r3, r1, PTO + PT_R3 |
| 358 | brlid r15, do_syscall_trace_enter |
| 359 | addik r5, r1, PTO + PT_R0 |
| 360 | |
| 361 | # do_syscall_trace_enter returns the new syscall nr. |
| 362 | addk r12, r0, r3 |
| 363 | lwi r5, r1, PTO+PT_R5; |
| 364 | lwi r6, r1, PTO+PT_R6; |
| 365 | lwi r7, r1, PTO+PT_R7; |
| 366 | lwi r8, r1, PTO+PT_R8; |
| 367 | lwi r9, r1, PTO+PT_R9; |
| 368 | lwi r10, r1, PTO+PT_R10; |
| 369 | 4: |
| 370 | /* Jump to the appropriate function for the system call number in r12 |
| 371 | * (r12 is not preserved), or return an error if r12 is not valid. |
| 372 | * The LP register should point to the location where the called function |
| 373 | * should return. [note that MAKE_SYS_CALL uses label 1] */ |
| 374 | /* See if the system call number is valid */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 375 | addi r11, r12, -__NR_syscalls; |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 376 | bgei r11,5f; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 377 | /* Figure out which function to use for this system call. */ |
| 378 | /* Note Microblaze barrel shift is optional, so don't rely on it */ |
| 379 | add r12, r12, r12; /* convert num -> ptr */ |
| 380 | add r12, r12, r12; |
| 381 | |
Michal Simek | 11d5136 | 2009-12-07 08:21:34 +0100 | [diff] [blame] | 382 | #ifdef DEBUG |
Michal Simek | d8748e7 | 2011-01-31 15:04:43 +0100 | [diff] [blame^] | 383 | /* Trac syscalls and stored them to syscall_debug_table */ |
| 384 | /* The first syscall location stores total syscall number */ |
| 385 | lwi r3, r0, syscall_debug_table |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 386 | addi r3, r3, 1 |
Michal Simek | d8748e7 | 2011-01-31 15:04:43 +0100 | [diff] [blame^] | 387 | swi r3, r0, syscall_debug_table |
| 388 | lwi r3, r12, syscall_debug_table |
| 389 | addi r3, r3, 1 |
| 390 | swi r3, r12, syscall_debug_table |
Michal Simek | 11d5136 | 2009-12-07 08:21:34 +0100 | [diff] [blame] | 391 | #endif |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 392 | |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 393 | # Find and jump into the syscall handler. |
| 394 | lwi r12, r12, sys_call_table |
| 395 | /* 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] | 396 | addi r15, r0, ret_from_trap-8 |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 397 | bra r12 |
| 398 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 399 | /* The syscall number is invalid, return an error. */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 400 | 5: |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 401 | rtsd r15, 8; /* looks like a normal subroutine return */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 402 | addi r3, r0, -ENOSYS; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 403 | |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 404 | /* Entry point used to return from a syscall/trap */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 405 | /* We re-enable BIP bit before state restore */ |
| 406 | C_ENTRY(ret_from_trap): |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 407 | swi r3, r1, PTO + PT_R3 |
| 408 | swi r4, r1, PTO + PT_R4 |
| 409 | |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 410 | lwi r11, r1, PTO + PT_MODE; |
| 411 | /* See if returning to kernel mode, if so, skip resched &c. */ |
| 412 | bnei r11, 2f; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 413 | /* We're returning to user mode, so check for various conditions that |
| 414 | * trigger rescheduling. */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 415 | /* FIXME: Restructure all these flag checks. */ |
| 416 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 417 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 418 | andi r11, r11, _TIF_WORK_SYSCALL_MASK |
| 419 | beqi r11, 1f |
| 420 | |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 421 | brlid r15, do_syscall_trace_leave |
| 422 | addik r5, r1, PTO + PT_R0 |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 423 | 1: |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 424 | /* We're returning to user mode, so check for various conditions that |
| 425 | * trigger rescheduling. */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 426 | /* get thread info from current task */ |
| 427 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 428 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 429 | andi r11, r11, _TIF_NEED_RESCHED; |
| 430 | beqi r11, 5f; |
| 431 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 432 | bralid r15, schedule; /* Call scheduler */ |
| 433 | nop; /* delay slot */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 434 | |
| 435 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 436 | 5: /* get thread info from current task*/ |
| 437 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 438 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 439 | andi r11, r11, _TIF_SIGPENDING; |
| 440 | beqi r11, 1f; /* Signals to handle, handle them */ |
| 441 | |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 442 | addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 443 | addi r7, r0, 1; /* Arg 3: int in_syscall */ |
| 444 | bralid r15, do_signal; /* Handle any signals */ |
Michal Simek | 841d6e8 | 2010-01-22 14:28:36 +0100 | [diff] [blame] | 445 | add r6, r0, r0; /* Arg 2: sigset_t *oldset */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 446 | |
| 447 | /* Finally, return to user state. */ |
Michal Simek | 96014cc | 2010-06-22 14:05:43 +0200 | [diff] [blame] | 448 | 1: set_bip; /* Ints masked for state restore */ |
Michal Simek | 8633beb | 2010-02-22 13:24:43 +0100 | [diff] [blame] | 449 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 450 | VM_OFF; |
| 451 | tophys(r1,r1); |
| 452 | RESTORE_REGS; |
| 453 | addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ |
| 454 | lwi r1, r1, PT_R1 - PT_SIZE;/* Restore user stack pointer. */ |
Michal Simek | 9da6345 | 2010-10-22 15:48:58 +1000 | [diff] [blame] | 455 | bri 6f; |
| 456 | |
| 457 | /* Return to kernel state. */ |
| 458 | 2: set_bip; /* Ints masked for state restore */ |
| 459 | VM_OFF; |
| 460 | tophys(r1,r1); |
| 461 | RESTORE_REGS; |
| 462 | addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ |
| 463 | tovirt(r1,r1); |
| 464 | 6: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 465 | TRAP_return: /* Make global symbol for debugging */ |
| 466 | rtbd r14, 0; /* Instructions to return from an IRQ */ |
| 467 | nop; |
| 468 | |
| 469 | |
| 470 | /* These syscalls need access to the struct pt_regs on the stack, so we |
| 471 | implement them in assembly (they're basically all wrappers anyway). */ |
| 472 | |
| 473 | C_ENTRY(sys_fork_wrapper): |
| 474 | addi r5, r0, SIGCHLD /* Arg 0: flags */ |
| 475 | lwi r6, r1, PTO+PT_R1 /* Arg 1: child SP (use parent's) */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 476 | addik r7, r1, PTO /* Arg 2: parent context */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 477 | add r8. r0, r0 /* Arg 3: (unused) */ |
| 478 | add r9, r0, r0; /* Arg 4: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 479 | brid do_fork /* Do real work (tail-call) */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 480 | add r10, r0, r0; /* Arg 5: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 481 | |
| 482 | /* This the initial entry point for a new child thread, with an appropriate |
| 483 | stack in place that makes it look the the child is in the middle of an |
| 484 | syscall. This function is actually `returned to' from switch_thread |
| 485 | (copy_thread makes ret_from_fork the return address in each new thread's |
| 486 | saved context). */ |
| 487 | C_ENTRY(ret_from_fork): |
| 488 | bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ |
| 489 | add r3, r5, r0; /* switch_thread returns the prev task */ |
| 490 | /* ( in the delay slot ) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 491 | brid ret_from_trap; /* Do normal trap return */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 492 | add r3, r0, r0; /* Child's fork call should return 0. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 493 | |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 494 | C_ENTRY(sys_vfork): |
| 495 | brid microblaze_vfork /* Do real work (tail-call) */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 496 | addik r5, r1, PTO |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 497 | |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 498 | C_ENTRY(sys_clone): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 499 | bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */ |
Michal Simek | 570e3e2 | 2010-06-04 13:06:27 +0200 | [diff] [blame] | 500 | lwi r6, r1, PTO + PT_R1; /* If so, use paret's stack ptr */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 501 | 1: addik r7, r1, PTO; /* Arg 2: parent context */ |
| 502 | add r8, r0, r0; /* Arg 3: (unused) */ |
| 503 | add r9, r0, r0; /* Arg 4: (unused) */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 504 | brid do_fork /* Do real work (tail-call) */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 505 | add r10, r0, r0; /* Arg 5: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 506 | |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 507 | C_ENTRY(sys_execve): |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 508 | brid microblaze_execve; /* Do real work (tail-call).*/ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 509 | addik r8, r1, PTO; /* add user context as 4th arg */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 510 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 511 | C_ENTRY(sys_rt_sigreturn_wrapper): |
Michal Simek | 791d0a1 | 2010-08-06 10:36:02 +0200 | [diff] [blame] | 512 | brid sys_rt_sigreturn /* Do real work */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 513 | addik r5, r1, PTO; /* add user context as 1st arg */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 514 | |
| 515 | /* |
| 516 | * HW EXCEPTION rutine start |
| 517 | */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 518 | C_ENTRY(full_exception_trap): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 519 | /* adjust exception address for privileged instruction |
| 520 | * for finding where is it */ |
| 521 | addik r17, r17, -4 |
| 522 | SAVE_STATE /* Save registers */ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 523 | /* PC, before IRQ/trap - this is one instruction above */ |
| 524 | swi r17, r1, PTO+PT_PC; |
| 525 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 526 | /* FIXME this can be store directly in PT_ESR reg. |
| 527 | * I tested it but there is a fault */ |
| 528 | /* 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] | 529 | addik r15, r0, ret_from_exc - 8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 530 | mfs r6, resr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 531 | mfs r7, rfsr; /* save FSR */ |
Michal Simek | 131e4e9 | 2009-09-28 08:50:53 +0200 | [diff] [blame] | 532 | mts rfsr, r0; /* Clear sticky fsr */ |
Michal Simek | c318d48 | 2010-06-22 16:25:31 +0200 | [diff] [blame] | 533 | rted r0, full_exception |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 534 | addik r5, r1, PTO /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 535 | |
| 536 | /* |
| 537 | * Unaligned data trap. |
| 538 | * |
| 539 | * Unaligned data trap last on 4k page is handled here. |
| 540 | * |
| 541 | * Trap entered via exception, so EE bit is set, and interrupts |
| 542 | * are masked. This is nice, means we don't have to CLI before state save |
| 543 | * |
| 544 | * The assembler routine is in "arch/microblaze/kernel/hw_exception_handler.S" |
| 545 | */ |
| 546 | C_ENTRY(unaligned_data_trap): |
Michal Simek | 8b110d1 | 2010-06-17 16:03:05 +0200 | [diff] [blame] | 547 | /* MS: I have to save r11 value and then restore it because |
| 548 | * set_bit, clear_eip, set_ee use r11 as temp register if MSR |
| 549 | * instructions are not used. We don't need to do if MSR instructions |
| 550 | * are used and they use r0 instead of r11. |
| 551 | * I am using ENTRY_SP which should be primary used only for stack |
| 552 | * pointer saving. */ |
| 553 | swi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
| 554 | set_bip; /* equalize initial state for all possible entries */ |
| 555 | clear_eip; |
| 556 | set_ee; |
| 557 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 558 | SAVE_STATE /* Save registers.*/ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 559 | /* PC, before IRQ/trap - this is one instruction above */ |
| 560 | swi r17, r1, PTO+PT_PC; |
| 561 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 562 | /* 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] | 563 | addik r15, r0, ret_from_exc-8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 564 | mfs r3, resr /* ESR */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 565 | mfs r4, rear /* EAR */ |
Michal Simek | c318d48 | 2010-06-22 16:25:31 +0200 | [diff] [blame] | 566 | rtbd r0, _unaligned_data_exception |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 567 | addik r7, r1, PTO /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 568 | |
| 569 | /* |
| 570 | * Page fault traps. |
| 571 | * |
| 572 | * If the real exception handler (from hw_exception_handler.S) didn't find |
| 573 | * the mapping for the process, then we're thrown here to handle such situation. |
| 574 | * |
| 575 | * Trap entered via exceptions, so EE bit is set, and interrupts |
| 576 | * are masked. This is nice, means we don't have to CLI before state save |
| 577 | * |
| 578 | * Build a standard exception frame for TLB Access errors. All TLB exceptions |
| 579 | * will bail out to this point if they can't resolve the lightweight TLB fault. |
| 580 | * |
| 581 | * The C function called is in "arch/microblaze/mm/fault.c", declared as: |
| 582 | * void do_page_fault(struct pt_regs *regs, |
| 583 | * unsigned long address, |
| 584 | * unsigned long error_code) |
| 585 | */ |
| 586 | /* data and intruction trap - which is choose is resolved int fault.c */ |
| 587 | C_ENTRY(page_fault_data_trap): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 588 | SAVE_STATE /* Save registers.*/ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 589 | /* PC, before IRQ/trap - this is one instruction above */ |
| 590 | swi r17, r1, PTO+PT_PC; |
| 591 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 592 | /* 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] | 593 | addik r15, r0, ret_from_exc-8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 594 | mfs r6, rear /* parameter unsigned long address */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 595 | mfs r7, resr /* parameter unsigned long error_code */ |
Michal Simek | c318d48 | 2010-06-22 16:25:31 +0200 | [diff] [blame] | 596 | rted r0, do_page_fault |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 597 | addik r5, r1, PTO /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 598 | |
| 599 | C_ENTRY(page_fault_instr_trap): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 600 | SAVE_STATE /* Save registers.*/ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 601 | /* PC, before IRQ/trap - this is one instruction above */ |
| 602 | swi r17, r1, PTO+PT_PC; |
| 603 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 604 | /* 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] | 605 | addik r15, r0, ret_from_exc-8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 606 | mfs r6, rear /* parameter unsigned long address */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 607 | ori r7, r0, 0 /* parameter unsigned long error_code */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 608 | rted r0, do_page_fault |
| 609 | addik r5, r1, PTO /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 610 | |
| 611 | /* Entry point used to return from an exception. */ |
| 612 | C_ENTRY(ret_from_exc): |
Michal Simek | 77f6d22 | 2010-06-22 16:39:56 +0200 | [diff] [blame] | 613 | lwi r11, r1, PTO + PT_MODE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 614 | bnei r11, 2f; /* See if returning to kernel mode, */ |
| 615 | /* ... if so, skip resched &c. */ |
| 616 | |
| 617 | /* We're returning to user mode, so check for various conditions that |
| 618 | trigger rescheduling. */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 619 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 620 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 621 | andi r11, r11, _TIF_NEED_RESCHED; |
| 622 | beqi r11, 5f; |
| 623 | |
| 624 | /* Call the scheduler before returning from a syscall/trap. */ |
| 625 | bralid r15, schedule; /* Call scheduler */ |
| 626 | nop; /* delay slot */ |
| 627 | |
| 628 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 629 | 5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 630 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 631 | andi r11, r11, _TIF_SIGPENDING; |
| 632 | beqi r11, 1f; /* Signals to handle, handle them */ |
| 633 | |
| 634 | /* |
| 635 | * Handle a signal return; Pending signals should be in r18. |
| 636 | * |
| 637 | * Not all registers are saved by the normal trap/interrupt entry |
| 638 | * points (for instance, call-saved registers (because the normal |
| 639 | * C-compiler calling sequence in the kernel makes sure they're |
| 640 | * preserved), and call-clobbered registers in the case of |
| 641 | * traps), but signal handlers may want to examine or change the |
| 642 | * complete register state. Here we save anything not saved by |
| 643 | * the normal entry sequence, so that it may be safely restored |
Michal Simek | 36f6095 | 2010-06-22 13:27:43 +0200 | [diff] [blame] | 644 | * (in a possibly modified form) after do_signal returns. */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 645 | addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 646 | addi r7, r0, 0; /* Arg 3: int in_syscall */ |
| 647 | bralid r15, do_signal; /* Handle any signals */ |
Michal Simek | 841d6e8 | 2010-01-22 14:28:36 +0100 | [diff] [blame] | 648 | add r6, r0, r0; /* Arg 2: sigset_t *oldset */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 649 | |
| 650 | /* Finally, return to user state. */ |
Michal Simek | 96014cc | 2010-06-22 14:05:43 +0200 | [diff] [blame] | 651 | 1: set_bip; /* Ints masked for state restore */ |
Michal Simek | 8633beb | 2010-02-22 13:24:43 +0100 | [diff] [blame] | 652 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 653 | VM_OFF; |
| 654 | tophys(r1,r1); |
| 655 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 656 | RESTORE_REGS; |
| 657 | addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ |
| 658 | |
| 659 | lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer. */ |
| 660 | bri 6f; |
| 661 | /* Return to kernel state. */ |
Michal Simek | 96014cc | 2010-06-22 14:05:43 +0200 | [diff] [blame] | 662 | 2: set_bip; /* Ints masked for state restore */ |
| 663 | VM_OFF; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 664 | tophys(r1,r1); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 665 | RESTORE_REGS; |
| 666 | addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ |
| 667 | |
| 668 | tovirt(r1,r1); |
| 669 | 6: |
| 670 | EXC_return: /* Make global symbol for debugging */ |
| 671 | rtbd r14, 0; /* Instructions to return from an IRQ */ |
| 672 | nop; |
| 673 | |
| 674 | /* |
| 675 | * HW EXCEPTION rutine end |
| 676 | */ |
| 677 | |
| 678 | /* |
| 679 | * Hardware maskable interrupts. |
| 680 | * |
| 681 | * The stack-pointer (r1) should have already been saved to the memory |
| 682 | * location PER_CPU(ENTRY_SP). |
| 683 | */ |
| 684 | C_ENTRY(_interrupt): |
| 685 | /* MS: we are in physical address */ |
| 686 | /* Save registers, switch to proper stack, convert SP to virtual.*/ |
| 687 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 688 | /* MS: See if already in kernel mode. */ |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 689 | mfs r1, rmsr |
Michal Simek | 5c0d72b | 2010-06-22 14:00:12 +0200 | [diff] [blame] | 690 | nop |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 691 | andi r1, r1, MSR_UMS |
| 692 | bnei r1, 1f |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 693 | |
| 694 | /* Kernel-mode state save. */ |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 695 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) |
| 696 | 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] | 697 | /* save registers */ |
| 698 | /* MS: Make room on the stack -> activation record */ |
| 699 | addik r1, r1, -STATE_SAVE_SIZE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 700 | SAVE_REGS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 701 | brid 2f; |
Michal Simek | 0a6b08f | 2010-06-22 20:49:46 +0200 | [diff] [blame] | 702 | swi r1, r1, PTO + PT_MODE; /* 0 - user mode, 1 - kernel mode */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 703 | 1: |
| 704 | /* User-mode state save. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 705 | /* MS: get the saved current */ |
| 706 | lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
| 707 | tophys(r1,r1); |
| 708 | lwi r1, r1, TS_THREAD_INFO; |
| 709 | addik r1, r1, THREAD_SIZE; |
| 710 | tophys(r1,r1); |
| 711 | /* save registers */ |
| 712 | addik r1, r1, -STATE_SAVE_SIZE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 713 | SAVE_REGS |
| 714 | /* calculate mode */ |
| 715 | swi r0, r1, PTO + PT_MODE; |
| 716 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
| 717 | swi r11, r1, PTO+PT_R1; |
Michal Simek | 80c5ff6 | 2010-06-22 18:50:31 +0200 | [diff] [blame] | 718 | clear_ums; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 719 | 2: |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 720 | lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 721 | tovirt(r1,r1) |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 722 | addik r15, r0, irq_call; |
Michal Simek | 80c5ff6 | 2010-06-22 18:50:31 +0200 | [diff] [blame] | 723 | irq_call:rtbd r0, do_IRQ; |
| 724 | addik r5, r1, PTO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 725 | |
| 726 | /* MS: we are in virtual mode */ |
| 727 | ret_from_irq: |
| 728 | lwi r11, r1, PTO + PT_MODE; |
| 729 | bnei r11, 2f; |
| 730 | |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 731 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 732 | lwi r11, r11, TI_FLAGS; /* MS: get flags from thread info */ |
| 733 | andi r11, r11, _TIF_NEED_RESCHED; |
| 734 | beqi r11, 5f |
| 735 | bralid r15, schedule; |
| 736 | nop; /* delay slot */ |
| 737 | |
| 738 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 739 | 5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* MS: get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 740 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 741 | andi r11, r11, _TIF_SIGPENDING; |
| 742 | beqid r11, no_intr_resched |
| 743 | /* Handle a signal return; Pending signals should be in r18. */ |
| 744 | addi r7, r0, 0; /* Arg 3: int in_syscall */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 745 | addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 746 | bralid r15, do_signal; /* Handle any signals */ |
| 747 | add r6, r0, r0; /* Arg 2: sigset_t *oldset */ |
| 748 | |
| 749 | /* Finally, return to user state. */ |
| 750 | no_intr_resched: |
| 751 | /* Disable interrupts, we are now committed to the state restore */ |
| 752 | disable_irq |
Michal Simek | 8633beb | 2010-02-22 13:24:43 +0100 | [diff] [blame] | 753 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 754 | VM_OFF; |
| 755 | tophys(r1,r1); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 756 | RESTORE_REGS |
| 757 | addik r1, r1, STATE_SAVE_SIZE /* MS: Clean up stack space. */ |
| 758 | lwi r1, r1, PT_R1 - PT_SIZE; |
| 759 | bri 6f; |
| 760 | /* MS: Return to kernel state. */ |
Michal Simek | 7775379 | 2010-01-12 09:55:10 +0100 | [diff] [blame] | 761 | 2: |
| 762 | #ifdef CONFIG_PREEMPT |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 763 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | 7775379 | 2010-01-12 09:55:10 +0100 | [diff] [blame] | 764 | /* MS: get preempt_count from thread info */ |
| 765 | lwi r5, r11, TI_PREEMPT_COUNT; |
| 766 | bgti r5, restore; |
| 767 | |
| 768 | lwi r5, r11, TI_FLAGS; /* get flags in thread info */ |
| 769 | andi r5, r5, _TIF_NEED_RESCHED; |
| 770 | beqi r5, restore /* if zero jump over */ |
| 771 | |
| 772 | preempt: |
| 773 | /* interrupts are off that's why I am calling preempt_chedule_irq */ |
| 774 | bralid r15, preempt_schedule_irq |
| 775 | nop |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 776 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | 7775379 | 2010-01-12 09:55:10 +0100 | [diff] [blame] | 777 | lwi r5, r11, TI_FLAGS; /* get flags in thread info */ |
| 778 | andi r5, r5, _TIF_NEED_RESCHED; |
| 779 | bnei r5, preempt /* if non zero jump to resched */ |
| 780 | restore: |
| 781 | #endif |
| 782 | VM_OFF /* MS: turn off MMU */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 783 | tophys(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 784 | RESTORE_REGS |
| 785 | addik r1, r1, STATE_SAVE_SIZE /* MS: Clean up stack space. */ |
| 786 | tovirt(r1,r1); |
| 787 | 6: |
| 788 | IRQ_return: /* MS: Make global symbol for debugging */ |
| 789 | rtid r14, 0 |
| 790 | nop |
| 791 | |
| 792 | /* |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 793 | * Debug trap for KGDB. Enter to _debug_exception by brki r16, 0x18 |
| 794 | * and call handling function with saved pt_regs |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 795 | */ |
| 796 | C_ENTRY(_debug_exception): |
| 797 | /* BIP bit is set on entry, no interrupts can occur */ |
| 798 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) |
| 799 | |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 800 | mfs r1, rmsr |
Michal Simek | 5c0d72b | 2010-06-22 14:00:12 +0200 | [diff] [blame] | 801 | nop |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 802 | andi r1, r1, MSR_UMS |
| 803 | bnei r1, 1f |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 804 | /* MS: Kernel-mode state save - kgdb */ |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 805 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 806 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 807 | /* BIP bit is set on entry, no interrupts can occur */ |
| 808 | addik r1, r1, CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - STATE_SAVE_SIZE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 809 | SAVE_REGS; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 810 | /* save all regs to pt_reg structure */ |
| 811 | swi r0, r1, PTO+PT_R0; /* R0 must be saved too */ |
| 812 | swi r14, r1, PTO+PT_R14 /* rewrite saved R14 value */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 813 | swi r16, r1, PTO+PT_PC; /* PC and r16 are the same */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 814 | /* save special purpose registers to pt_regs */ |
| 815 | mfs r11, rear; |
| 816 | swi r11, r1, PTO+PT_EAR; |
| 817 | mfs r11, resr; |
| 818 | swi r11, r1, PTO+PT_ESR; |
| 819 | mfs r11, rfsr; |
| 820 | swi r11, r1, PTO+PT_FSR; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 821 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 822 | /* stack pointer is in physical address at it is decrease |
| 823 | * by STATE_SAVE_SIZE but we need to get correct R1 value */ |
| 824 | addik r11, r1, CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR + STATE_SAVE_SIZE; |
| 825 | swi r11, r1, PTO+PT_R1 |
| 826 | /* MS: r31 - current pointer isn't changed */ |
| 827 | tovirt(r1,r1) |
| 828 | #ifdef CONFIG_KGDB |
| 829 | addi r5, r1, PTO /* pass pt_reg address as the first arg */ |
| 830 | la r15, r0, dbtrap_call; /* return address */ |
| 831 | rtbd r0, microblaze_kgdb_break |
| 832 | nop; |
| 833 | #endif |
| 834 | /* MS: Place handler for brki from kernel space if KGDB is OFF. |
| 835 | * It is very unlikely that another brki instruction is called. */ |
| 836 | bri 0 |
| 837 | |
| 838 | /* MS: User-mode state save - gdb */ |
| 839 | 1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 840 | tophys(r1,r1); |
| 841 | lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ |
| 842 | addik r1, r1, THREAD_SIZE; /* calculate kernel stack pointer */ |
| 843 | tophys(r1,r1); |
| 844 | |
| 845 | addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 846 | SAVE_REGS; |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 847 | swi r16, r1, PTO+PT_PC; /* Save LP */ |
Michal Simek | 77f6d22 | 2010-06-22 16:39:56 +0200 | [diff] [blame] | 848 | swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 849 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
| 850 | swi r11, r1, PTO+PT_R1; /* Store user SP. */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 851 | lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 852 | tovirt(r1,r1) |
Michal Simek | 06b2864 | 2010-06-22 15:25:24 +0200 | [diff] [blame] | 853 | set_vms; |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 854 | addik r5, r1, PTO; |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 855 | addik r15, r0, dbtrap_call; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 856 | 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] | 857 | rtbd r0, sw_exception |
| 858 | nop |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 859 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 860 | /* MS: The first instruction for the second part of the gdb/kgdb */ |
| 861 | set_bip; /* Ints masked for state restore */ |
Michal Simek | 77f6d22 | 2010-06-22 16:39:56 +0200 | [diff] [blame] | 862 | lwi r11, r1, PTO + PT_MODE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 863 | bnei r11, 2f; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 864 | /* MS: Return to user space - gdb */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 865 | /* Get current task ptr into r11 */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 866 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 867 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 868 | andi r11, r11, _TIF_NEED_RESCHED; |
| 869 | beqi r11, 5f; |
| 870 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 871 | /* Call the scheduler before returning from a syscall/trap. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 872 | bralid r15, schedule; /* Call scheduler */ |
| 873 | nop; /* delay slot */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 874 | |
| 875 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 876 | 5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 877 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 878 | andi r11, r11, _TIF_SIGPENDING; |
| 879 | beqi r11, 1f; /* Signals to handle, handle them */ |
| 880 | |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 881 | addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 882 | addi r7, r0, 0; /* Arg 3: int in_syscall */ |
| 883 | bralid r15, do_signal; /* Handle any signals */ |
Michal Simek | 841d6e8 | 2010-01-22 14:28:36 +0100 | [diff] [blame] | 884 | add r6, r0, r0; /* Arg 2: sigset_t *oldset */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 885 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 886 | /* Finally, return to user state. */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 887 | 1: swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 888 | VM_OFF; |
| 889 | tophys(r1,r1); |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 890 | /* MS: Restore all regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 891 | RESTORE_REGS |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 892 | addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space */ |
| 893 | lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer */ |
| 894 | DBTRAP_return_user: /* MS: Make global symbol for debugging */ |
| 895 | rtbd r16, 0; /* MS: Instructions to return from a debug trap */ |
| 896 | nop; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 897 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 898 | /* MS: Return to kernel state - kgdb */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 899 | 2: VM_OFF; |
| 900 | tophys(r1,r1); |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 901 | /* MS: Restore all regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 902 | RESTORE_REGS |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 903 | lwi r14, r1, PTO+PT_R14; |
| 904 | lwi r16, r1, PTO+PT_PC; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 905 | addik r1, r1, STATE_SAVE_SIZE; /* MS: Clean up stack space */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 906 | tovirt(r1,r1); |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame] | 907 | DBTRAP_return_kernel: /* MS: Make global symbol for debugging */ |
| 908 | rtbd r16, 0; /* MS: Instructions to return from a debug trap */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 909 | nop; |
| 910 | |
| 911 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 912 | ENTRY(_switch_to) |
| 913 | /* prepare return value */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 914 | addk r3, r0, CURRENT_TASK |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 915 | |
| 916 | /* save registers in cpu_context */ |
| 917 | /* use r11 and r12, volatile registers, as temp register */ |
| 918 | /* give start of cpu_context for previous process */ |
| 919 | addik r11, r5, TI_CPU_CONTEXT |
| 920 | swi r1, r11, CC_R1 |
| 921 | swi r2, r11, CC_R2 |
| 922 | /* skip volatile registers. |
| 923 | * they are saved on stack when we jumped to _switch_to() */ |
| 924 | /* dedicated registers */ |
| 925 | swi r13, r11, CC_R13 |
| 926 | swi r14, r11, CC_R14 |
| 927 | swi r15, r11, CC_R15 |
| 928 | swi r16, r11, CC_R16 |
| 929 | swi r17, r11, CC_R17 |
| 930 | swi r18, r11, CC_R18 |
| 931 | /* save non-volatile registers */ |
| 932 | swi r19, r11, CC_R19 |
| 933 | swi r20, r11, CC_R20 |
| 934 | swi r21, r11, CC_R21 |
| 935 | swi r22, r11, CC_R22 |
| 936 | swi r23, r11, CC_R23 |
| 937 | swi r24, r11, CC_R24 |
| 938 | swi r25, r11, CC_R25 |
| 939 | swi r26, r11, CC_R26 |
| 940 | swi r27, r11, CC_R27 |
| 941 | swi r28, r11, CC_R28 |
| 942 | swi r29, r11, CC_R29 |
| 943 | swi r30, r11, CC_R30 |
| 944 | /* special purpose registers */ |
| 945 | mfs r12, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 946 | swi r12, r11, CC_MSR |
| 947 | mfs r12, rear |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 948 | swi r12, r11, CC_EAR |
| 949 | mfs r12, resr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 950 | swi r12, r11, CC_ESR |
| 951 | mfs r12, rfsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 952 | swi r12, r11, CC_FSR |
| 953 | |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 954 | /* update r31, the current-give me pointer to task which will be next */ |
| 955 | lwi CURRENT_TASK, r6, TI_TASK |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 956 | /* stored it to current_save too */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 957 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 958 | |
| 959 | /* get new process' cpu context and restore */ |
| 960 | /* give me start where start context of next task */ |
| 961 | addik r11, r6, TI_CPU_CONTEXT |
| 962 | |
| 963 | /* non-volatile registers */ |
| 964 | lwi r30, r11, CC_R30 |
| 965 | lwi r29, r11, CC_R29 |
| 966 | lwi r28, r11, CC_R28 |
| 967 | lwi r27, r11, CC_R27 |
| 968 | lwi r26, r11, CC_R26 |
| 969 | lwi r25, r11, CC_R25 |
| 970 | lwi r24, r11, CC_R24 |
| 971 | lwi r23, r11, CC_R23 |
| 972 | lwi r22, r11, CC_R22 |
| 973 | lwi r21, r11, CC_R21 |
| 974 | lwi r20, r11, CC_R20 |
| 975 | lwi r19, r11, CC_R19 |
| 976 | /* dedicated registers */ |
| 977 | lwi r18, r11, CC_R18 |
| 978 | lwi r17, r11, CC_R17 |
| 979 | lwi r16, r11, CC_R16 |
| 980 | lwi r15, r11, CC_R15 |
| 981 | lwi r14, r11, CC_R14 |
| 982 | lwi r13, r11, CC_R13 |
| 983 | /* skip volatile registers */ |
| 984 | lwi r2, r11, CC_R2 |
| 985 | lwi r1, r11, CC_R1 |
| 986 | |
| 987 | /* special purpose registers */ |
| 988 | lwi r12, r11, CC_FSR |
| 989 | mts rfsr, r12 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 990 | lwi r12, r11, CC_MSR |
| 991 | mts rmsr, r12 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 992 | |
| 993 | rtsd r15, 8 |
| 994 | nop |
| 995 | |
| 996 | ENTRY(_reset) |
| 997 | brai 0x70; /* Jump back to FS-boot */ |
| 998 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 999 | /* These are compiled and loaded into high memory, then |
| 1000 | * copied into place in mach_early_setup */ |
| 1001 | .section .init.ivt, "ax" |
| 1002 | .org 0x0 |
| 1003 | /* this is very important - here is the reset vector */ |
| 1004 | /* in current MMU branch you don't care what is here - it is |
| 1005 | * used from bootloader site - but this is correct for FS-BOOT */ |
| 1006 | brai 0x70 |
| 1007 | nop |
| 1008 | brai TOPHYS(_user_exception); /* syscall handler */ |
| 1009 | brai TOPHYS(_interrupt); /* Interrupt handler */ |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 1010 | brai TOPHYS(_debug_exception); /* debug trap handler */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 1011 | brai TOPHYS(_hw_exception_handler); /* HW exception handler */ |
| 1012 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 1013 | .section .rodata,"a" |
| 1014 | #include "syscall_table.S" |
| 1015 | |
| 1016 | syscall_table_size=(.-sys_call_table) |
| 1017 | |
Steven J. Magnani | ce3266c | 2010-04-27 12:37:54 -0500 | [diff] [blame] | 1018 | type_SYSCALL: |
| 1019 | .ascii "SYSCALL\0" |
| 1020 | type_IRQ: |
| 1021 | .ascii "IRQ\0" |
| 1022 | type_IRQ_PREEMPT: |
| 1023 | .ascii "IRQ (PREEMPTED)\0" |
| 1024 | type_SYSCALL_PREEMPT: |
| 1025 | .ascii " SYSCALL (PREEMPTED)\0" |
| 1026 | |
| 1027 | /* |
| 1028 | * Trap decoding for stack unwinder |
| 1029 | * Tuples are (start addr, end addr, string) |
| 1030 | * If return address lies on [start addr, end addr], |
| 1031 | * unwinder displays 'string' |
| 1032 | */ |
| 1033 | |
| 1034 | .align 4 |
| 1035 | .global microblaze_trap_handlers |
| 1036 | microblaze_trap_handlers: |
| 1037 | /* Exact matches come first */ |
| 1038 | .word ret_from_trap; .word ret_from_trap ; .word type_SYSCALL |
| 1039 | .word ret_from_irq ; .word ret_from_irq ; .word type_IRQ |
| 1040 | /* Fuzzy matches go here */ |
| 1041 | .word ret_from_irq ; .word no_intr_resched ; .word type_IRQ_PREEMPT |
| 1042 | .word ret_from_trap; .word TRAP_return ; .word type_SYSCALL_PREEMPT |
| 1043 | /* End of table */ |
| 1044 | .word 0 ; .word 0 ; .word 0 |