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 | |
| 42 | #define C_ENTRY(name) .globl name; .align 4; name |
| 43 | |
| 44 | /* |
| 45 | * Various ways of setting and clearing BIP in flags reg. |
| 46 | * This is mucky, but necessary using microblaze version that |
| 47 | * allows msr ops to write to BIP |
| 48 | */ |
| 49 | #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR |
| 50 | .macro clear_bip |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 51 | msrclr r0, MSR_BIP |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 52 | .endm |
| 53 | |
| 54 | .macro set_bip |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 55 | msrset r0, MSR_BIP |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 56 | .endm |
| 57 | |
| 58 | .macro clear_eip |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 59 | msrclr r0, MSR_EIP |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 60 | .endm |
| 61 | |
| 62 | .macro set_ee |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 63 | msrset r0, MSR_EE |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 64 | .endm |
| 65 | |
| 66 | .macro disable_irq |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 67 | msrclr r0, MSR_IE |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 68 | .endm |
| 69 | |
| 70 | .macro enable_irq |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 71 | msrset r0, MSR_IE |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 72 | .endm |
| 73 | |
| 74 | .macro set_ums |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 75 | msrset r0, MSR_UMS |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 76 | msrclr r0, MSR_VMS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 77 | .endm |
| 78 | |
| 79 | .macro set_vms |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 80 | msrclr r0, MSR_UMS |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 81 | msrset r0, MSR_VMS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 82 | .endm |
| 83 | |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 84 | .macro clear_ums |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 85 | msrclr r0, MSR_UMS |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 86 | .endm |
| 87 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 88 | .macro clear_vms_ums |
Michal Simek | 66f7de86 | 2010-06-22 17:52:47 +0200 | [diff] [blame] | 89 | msrclr r0, MSR_VMS | MSR_UMS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 90 | .endm |
| 91 | #else |
| 92 | .macro clear_bip |
| 93 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 94 | andi r11, r11, ~MSR_BIP |
| 95 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 96 | .endm |
| 97 | |
| 98 | .macro set_bip |
| 99 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 100 | ori r11, r11, MSR_BIP |
| 101 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 102 | .endm |
| 103 | |
| 104 | .macro clear_eip |
| 105 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 106 | andi r11, r11, ~MSR_EIP |
| 107 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 108 | .endm |
| 109 | |
| 110 | .macro set_ee |
| 111 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 112 | ori r11, r11, MSR_EE |
| 113 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 114 | .endm |
| 115 | |
| 116 | .macro disable_irq |
| 117 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 118 | andi r11, r11, ~MSR_IE |
| 119 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 120 | .endm |
| 121 | |
| 122 | .macro enable_irq |
| 123 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 124 | ori r11, r11, MSR_IE |
| 125 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 126 | .endm |
| 127 | |
| 128 | .macro set_ums |
| 129 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 130 | ori r11, r11, MSR_VMS |
| 131 | andni r11, r11, MSR_UMS |
| 132 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 133 | .endm |
| 134 | |
| 135 | .macro set_vms |
| 136 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 137 | ori r11, r11, MSR_VMS |
| 138 | andni r11, r11, MSR_UMS |
| 139 | mts rmsr, r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 140 | .endm |
| 141 | |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 142 | .macro clear_ums |
| 143 | mfs r11, rmsr |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 144 | andni r11, r11, MSR_UMS |
| 145 | mts rmsr,r11 |
Michal Simek | b318067 | 2010-06-22 17:46:27 +0200 | [diff] [blame] | 146 | .endm |
| 147 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 148 | .macro clear_vms_ums |
| 149 | mfs r11, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 150 | andni r11, r11, (MSR_VMS|MSR_UMS) |
| 151 | mts rmsr,r11 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 152 | .endm |
| 153 | #endif |
| 154 | |
| 155 | /* Define how to call high-level functions. With MMU, virtual mode must be |
| 156 | * enabled when calling the high-level function. Clobbers R11. |
| 157 | * VM_ON, VM_OFF, DO_JUMP_BIPCLR, DO_CALL |
| 158 | */ |
| 159 | |
| 160 | /* turn on virtual protected mode save */ |
| 161 | #define VM_ON \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 162 | set_ums; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 163 | rted r0, 2f; \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 164 | nop; \ |
| 165 | 2: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 166 | |
| 167 | /* turn off virtual protected mode save and user mode save*/ |
| 168 | #define VM_OFF \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 169 | clear_vms_ums; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 170 | rted r0, TOPHYS(1f); \ |
Michal Simek | a4a94db | 2010-06-22 13:15:53 +0200 | [diff] [blame] | 171 | nop; \ |
| 172 | 1: |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 173 | |
| 174 | #define SAVE_REGS \ |
| 175 | swi r2, r1, PTO+PT_R2; /* Save SDA */ \ |
Michal Simek | 36f6095 | 2010-06-22 13:27:43 +0200 | [diff] [blame] | 176 | swi r3, r1, PTO+PT_R3; \ |
| 177 | swi r4, r1, PTO+PT_R4; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 178 | swi r5, r1, PTO+PT_R5; \ |
| 179 | swi r6, r1, PTO+PT_R6; \ |
| 180 | swi r7, r1, PTO+PT_R7; \ |
| 181 | swi r8, r1, PTO+PT_R8; \ |
| 182 | swi r9, r1, PTO+PT_R9; \ |
| 183 | swi r10, r1, PTO+PT_R10; \ |
| 184 | swi r11, r1, PTO+PT_R11; /* save clobbered regs after rval */\ |
| 185 | swi r12, r1, PTO+PT_R12; \ |
| 186 | swi r13, r1, PTO+PT_R13; /* Save SDA2 */ \ |
| 187 | swi r14, r1, PTO+PT_PC; /* PC, before IRQ/trap */ \ |
| 188 | swi r15, r1, PTO+PT_R15; /* Save LP */ \ |
| 189 | swi r18, r1, PTO+PT_R18; /* Save asm scratch reg */ \ |
| 190 | swi r19, r1, PTO+PT_R19; \ |
| 191 | swi r20, r1, PTO+PT_R20; \ |
| 192 | swi r21, r1, PTO+PT_R21; \ |
| 193 | swi r22, r1, PTO+PT_R22; \ |
| 194 | swi r23, r1, PTO+PT_R23; \ |
| 195 | swi r24, r1, PTO+PT_R24; \ |
| 196 | swi r25, r1, PTO+PT_R25; \ |
| 197 | swi r26, r1, PTO+PT_R26; \ |
| 198 | swi r27, r1, PTO+PT_R27; \ |
| 199 | swi r28, r1, PTO+PT_R28; \ |
| 200 | swi r29, r1, PTO+PT_R29; \ |
| 201 | swi r30, r1, PTO+PT_R30; \ |
| 202 | swi r31, r1, PTO+PT_R31; /* Save current task reg */ \ |
| 203 | mfs r11, rmsr; /* save MSR */ \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 204 | swi r11, r1, PTO+PT_MSR; |
| 205 | |
| 206 | #define RESTORE_REGS \ |
| 207 | lwi r11, r1, PTO+PT_MSR; \ |
| 208 | mts rmsr , r11; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 209 | lwi r2, r1, PTO+PT_R2; /* restore SDA */ \ |
Michal Simek | 36f6095 | 2010-06-22 13:27:43 +0200 | [diff] [blame] | 210 | lwi r3, r1, PTO+PT_R3; \ |
| 211 | lwi r4, r1, PTO+PT_R4; \ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 212 | lwi r5, r1, PTO+PT_R5; \ |
| 213 | lwi r6, r1, PTO+PT_R6; \ |
| 214 | lwi r7, r1, PTO+PT_R7; \ |
| 215 | lwi r8, r1, PTO+PT_R8; \ |
| 216 | lwi r9, r1, PTO+PT_R9; \ |
| 217 | lwi r10, r1, PTO+PT_R10; \ |
| 218 | lwi r11, r1, PTO+PT_R11; /* restore clobbered regs after rval */\ |
| 219 | lwi r12, r1, PTO+PT_R12; \ |
| 220 | lwi r13, r1, PTO+PT_R13; /* restore SDA2 */ \ |
| 221 | lwi r14, r1, PTO+PT_PC; /* RESTORE_LINK PC, before IRQ/trap */\ |
| 222 | lwi r15, r1, PTO+PT_R15; /* restore LP */ \ |
| 223 | lwi r18, r1, PTO+PT_R18; /* restore asm scratch reg */ \ |
| 224 | lwi r19, r1, PTO+PT_R19; \ |
| 225 | lwi r20, r1, PTO+PT_R20; \ |
| 226 | lwi r21, r1, PTO+PT_R21; \ |
| 227 | lwi r22, r1, PTO+PT_R22; \ |
| 228 | lwi r23, r1, PTO+PT_R23; \ |
| 229 | lwi r24, r1, PTO+PT_R24; \ |
| 230 | lwi r25, r1, PTO+PT_R25; \ |
| 231 | lwi r26, r1, PTO+PT_R26; \ |
| 232 | lwi r27, r1, PTO+PT_R27; \ |
| 233 | lwi r28, r1, PTO+PT_R28; \ |
| 234 | lwi r29, r1, PTO+PT_R29; \ |
| 235 | lwi r30, r1, PTO+PT_R30; \ |
| 236 | lwi r31, r1, PTO+PT_R31; /* Restore cur task reg */ |
| 237 | |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 238 | #define SAVE_STATE \ |
| 239 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* save stack */ \ |
| 240 | /* See if already in kernel mode.*/ \ |
| 241 | mfs r1, rmsr; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 242 | andi r1, r1, MSR_UMS; \ |
| 243 | bnei r1, 1f; \ |
| 244 | /* Kernel-mode state save. */ \ |
| 245 | /* Reload kernel stack-ptr. */ \ |
| 246 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); \ |
Michal Simek | 287503f | 2010-06-22 18:16:07 +0200 | [diff] [blame] | 247 | /* FIXME: I can add these two lines to one */ \ |
| 248 | /* tophys(r1,r1); */ \ |
| 249 | /* addik r1, r1, -STATE_SAVE_SIZE; */ \ |
| 250 | 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] | 251 | SAVE_REGS \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 252 | brid 2f; \ |
Michal Simek | da23355 | 2010-06-22 18:02:06 +0200 | [diff] [blame] | 253 | swi r1, r1, PTO+PT_MODE; \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 254 | 1: /* User-mode state save. */ \ |
| 255 | lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */\ |
| 256 | tophys(r1,r1); \ |
| 257 | lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ \ |
Michal Simek | 287503f | 2010-06-22 18:16:07 +0200 | [diff] [blame] | 258 | /* MS these three instructions can be added to one */ \ |
| 259 | /* addik r1, r1, THREAD_SIZE; */ \ |
| 260 | /* tophys(r1,r1); */ \ |
| 261 | /* addik r1, r1, -STATE_SAVE_SIZE; */ \ |
| 262 | 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] | 263 | SAVE_REGS \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 264 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); \ |
| 265 | swi r11, r1, PTO+PT_R1; /* Store user SP. */ \ |
Michal Simek | e7741075 | 2010-06-22 18:00:35 +0200 | [diff] [blame] | 266 | swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */ \ |
Michal Simek | e5d2af2 | 2010-06-22 17:58:26 +0200 | [diff] [blame] | 267 | /* MS: I am clearing UMS even in case when I come from kernel space */ \ |
| 268 | clear_ums; \ |
| 269 | 2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
| 270 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 271 | .text |
| 272 | |
| 273 | /* |
| 274 | * User trap. |
| 275 | * |
| 276 | * System calls are handled here. |
| 277 | * |
| 278 | * Syscall protocol: |
| 279 | * Syscall number in r12, args in r5-r10 |
| 280 | * Return value in r3 |
| 281 | * |
| 282 | * Trap entered via brki instruction, so BIP bit is set, and interrupts |
| 283 | * are masked. This is nice, means we don't have to CLI before state save |
| 284 | */ |
| 285 | C_ENTRY(_user_exception): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 286 | addi r14, r14, 4 /* return address is 4 byte after call */ |
Michal Simek | 0e41c90 | 2010-06-22 21:11:49 +0200 | [diff] [blame] | 287 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 288 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 289 | lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ |
| 290 | tophys(r1,r1); |
| 291 | lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */ |
Michal Simek | 0e41c90 | 2010-06-22 21:11:49 +0200 | [diff] [blame] | 292 | /* MS these three instructions can be added to one */ |
| 293 | /* addik r1, r1, THREAD_SIZE; */ |
| 294 | /* tophys(r1,r1); */ |
| 295 | /* addik r1, r1, -STATE_SAVE_SIZE; */ |
| 296 | addik r1, r1, THREAD_SIZE + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - STATE_SAVE_SIZE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 297 | SAVE_REGS |
| 298 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 299 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
| 300 | swi r11, r1, PTO+PT_R1; /* Store user SP. */ |
Michal Simek | 25f6e59 | 2010-06-22 18:29:05 +0200 | [diff] [blame] | 301 | clear_ums; |
Michal Simek | 0e41c90 | 2010-06-22 21:11:49 +0200 | [diff] [blame] | 302 | lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 303 | /* Save away the syscall number. */ |
| 304 | swi r12, r1, PTO+PT_R0; |
| 305 | tovirt(r1,r1) |
| 306 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 307 | /* where the trap should return need -8 to adjust for rtsd r15, 8*/ |
| 308 | /* Jump to the appropriate function for the system call number in r12 |
| 309 | * (r12 is not preserved), or return an error if r12 is not valid. The LP |
| 310 | * register should point to the location where |
| 311 | * 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] | 312 | |
Michal Simek | 25f6e59 | 2010-06-22 18:29:05 +0200 | [diff] [blame] | 313 | /* Step into virtual mode */ |
| 314 | rtbd r0, 3f |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 315 | nop |
| 316 | 3: |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 317 | lwi r11, CURRENT_TASK, TS_THREAD_INFO /* get thread info */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 318 | lwi r11, r11, TI_FLAGS /* get flags in thread info */ |
| 319 | andi r11, r11, _TIF_WORK_SYSCALL_MASK |
| 320 | beqi r11, 4f |
| 321 | |
| 322 | addik r3, r0, -ENOSYS |
| 323 | swi r3, r1, PTO + PT_R3 |
| 324 | brlid r15, do_syscall_trace_enter |
| 325 | addik r5, r1, PTO + PT_R0 |
| 326 | |
| 327 | # do_syscall_trace_enter returns the new syscall nr. |
| 328 | addk r12, r0, r3 |
| 329 | lwi r5, r1, PTO+PT_R5; |
| 330 | lwi r6, r1, PTO+PT_R6; |
| 331 | lwi r7, r1, PTO+PT_R7; |
| 332 | lwi r8, r1, PTO+PT_R8; |
| 333 | lwi r9, r1, PTO+PT_R9; |
| 334 | lwi r10, r1, PTO+PT_R10; |
| 335 | 4: |
| 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. |
| 338 | * The LP register should point to the location where the called function |
| 339 | * should return. [note that MAKE_SYS_CALL uses label 1] */ |
| 340 | /* See if the system call number is valid */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 341 | addi r11, r12, -__NR_syscalls; |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 342 | bgei r11,5f; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 343 | /* Figure out which function to use for this system call. */ |
| 344 | /* Note Microblaze barrel shift is optional, so don't rely on it */ |
| 345 | add r12, r12, r12; /* convert num -> ptr */ |
| 346 | add r12, r12, r12; |
| 347 | |
Michal Simek | 11d5136 | 2009-12-07 08:21:34 +0100 | [diff] [blame] | 348 | #ifdef DEBUG |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 349 | /* Trac syscalls and stored them to r0_ram */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 350 | lwi r3, r12, 0x400 + r0_ram |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 351 | addi r3, r3, 1 |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 352 | swi r3, r12, 0x400 + r0_ram |
Michal Simek | 11d5136 | 2009-12-07 08:21:34 +0100 | [diff] [blame] | 353 | #endif |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 354 | |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 355 | # Find and jump into the syscall handler. |
| 356 | lwi r12, r12, sys_call_table |
| 357 | /* 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] | 358 | addi r15, r0, ret_from_trap-8 |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 359 | bra r12 |
| 360 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 361 | /* The syscall number is invalid, return an error. */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 362 | 5: |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 363 | rtsd r15, 8; /* looks like a normal subroutine return */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 364 | addi r3, r0, -ENOSYS; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 365 | |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 366 | /* Entry point used to return from a syscall/trap */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 367 | /* We re-enable BIP bit before state restore */ |
| 368 | C_ENTRY(ret_from_trap): |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 369 | swi r3, r1, PTO + PT_R3 |
| 370 | swi r4, r1, PTO + PT_R4 |
| 371 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 372 | /* We're returning to user mode, so check for various conditions that |
| 373 | * trigger rescheduling. */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 374 | /* FIXME: Restructure all these flag checks. */ |
| 375 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 376 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 377 | andi r11, r11, _TIF_WORK_SYSCALL_MASK |
| 378 | beqi r11, 1f |
| 379 | |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 380 | brlid r15, do_syscall_trace_leave |
| 381 | addik r5, r1, PTO + PT_R0 |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 382 | 1: |
Michal Simek | 2357548 | 2009-08-24 13:26:04 +0200 | [diff] [blame] | 383 | /* We're returning to user mode, so check for various conditions that |
| 384 | * trigger rescheduling. */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 385 | /* get thread info from current task */ |
| 386 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 387 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 388 | andi r11, r11, _TIF_NEED_RESCHED; |
| 389 | beqi r11, 5f; |
| 390 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 391 | bralid r15, schedule; /* Call scheduler */ |
| 392 | nop; /* delay slot */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 393 | |
| 394 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 395 | 5: /* get thread info from current task*/ |
| 396 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 397 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 398 | andi r11, r11, _TIF_SIGPENDING; |
| 399 | beqi r11, 1f; /* Signals to handle, handle them */ |
| 400 | |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 401 | addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 402 | addi r7, r0, 1; /* Arg 3: int in_syscall */ |
| 403 | bralid r15, do_signal; /* Handle any signals */ |
Michal Simek | 841d6e8 | 2010-01-22 14:28:36 +0100 | [diff] [blame] | 404 | add r6, r0, r0; /* Arg 2: sigset_t *oldset */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 405 | |
| 406 | /* Finally, return to user state. */ |
Michal Simek | 96014cc | 2010-06-22 14:05:43 +0200 | [diff] [blame] | 407 | 1: set_bip; /* Ints masked for state restore */ |
Michal Simek | 8633beb | 2010-02-22 13:24:43 +0100 | [diff] [blame] | 408 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 409 | VM_OFF; |
| 410 | tophys(r1,r1); |
| 411 | RESTORE_REGS; |
| 412 | addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ |
| 413 | lwi r1, r1, PT_R1 - PT_SIZE;/* Restore user stack pointer. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 414 | TRAP_return: /* Make global symbol for debugging */ |
| 415 | rtbd r14, 0; /* Instructions to return from an IRQ */ |
| 416 | nop; |
| 417 | |
| 418 | |
| 419 | /* These syscalls need access to the struct pt_regs on the stack, so we |
| 420 | implement them in assembly (they're basically all wrappers anyway). */ |
| 421 | |
| 422 | C_ENTRY(sys_fork_wrapper): |
| 423 | addi r5, r0, SIGCHLD /* Arg 0: flags */ |
| 424 | 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] | 425 | addik r7, r1, PTO /* Arg 2: parent context */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 426 | add r8. r0, r0 /* Arg 3: (unused) */ |
| 427 | add r9, r0, r0; /* Arg 4: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 428 | brid do_fork /* Do real work (tail-call) */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 429 | add r10, r0, r0; /* Arg 5: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 430 | |
| 431 | /* This the initial entry point for a new child thread, with an appropriate |
| 432 | stack in place that makes it look the the child is in the middle of an |
| 433 | syscall. This function is actually `returned to' from switch_thread |
| 434 | (copy_thread makes ret_from_fork the return address in each new thread's |
| 435 | saved context). */ |
| 436 | C_ENTRY(ret_from_fork): |
| 437 | bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ |
| 438 | add r3, r5, r0; /* switch_thread returns the prev task */ |
| 439 | /* ( in the delay slot ) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 440 | brid ret_from_trap; /* Do normal trap return */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 441 | add r3, r0, r0; /* Child's fork call should return 0. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 442 | |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 443 | C_ENTRY(sys_vfork): |
| 444 | brid microblaze_vfork /* Do real work (tail-call) */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 445 | addik r5, r1, PTO |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 446 | |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 447 | C_ENTRY(sys_clone): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 448 | bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */ |
Michal Simek | 570e3e2 | 2010-06-04 13:06:27 +0200 | [diff] [blame] | 449 | 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] | 450 | 1: addik r7, r1, PTO; /* Arg 2: parent context */ |
| 451 | add r8, r0, r0; /* Arg 3: (unused) */ |
| 452 | add r9, r0, r0; /* Arg 4: (unused) */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 453 | brid do_fork /* Do real work (tail-call) */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 454 | add r10, r0, r0; /* Arg 5: (unused) */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 455 | |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 456 | C_ENTRY(sys_execve): |
Arnd Bergmann | e513588 | 2009-06-18 19:55:30 +0200 | [diff] [blame] | 457 | brid microblaze_execve; /* Do real work (tail-call).*/ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 458 | addik r8, r1, PTO; /* add user context as 4th arg */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 459 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 460 | C_ENTRY(sys_rt_sigreturn_wrapper): |
| 461 | swi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */ |
| 462 | swi r4, r1, PTO+PT_R4; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 463 | brlid r15, sys_rt_sigreturn /* Do real work */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 464 | addik r5, r1, PTO; /* add user context as 1st arg */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 465 | lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */ |
| 466 | lwi r4, r1, PTO+PT_R4; |
| 467 | bri ret_from_trap /* fall through will not work here due to align */ |
| 468 | nop; |
| 469 | |
| 470 | /* |
| 471 | * HW EXCEPTION rutine start |
| 472 | */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 473 | C_ENTRY(full_exception_trap): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 474 | /* adjust exception address for privileged instruction |
| 475 | * for finding where is it */ |
| 476 | addik r17, r17, -4 |
| 477 | SAVE_STATE /* Save registers */ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 478 | /* PC, before IRQ/trap - this is one instruction above */ |
| 479 | swi r17, r1, PTO+PT_PC; |
| 480 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 481 | /* FIXME this can be store directly in PT_ESR reg. |
| 482 | * I tested it but there is a fault */ |
| 483 | /* 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] | 484 | addik r15, r0, ret_from_exc - 8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 485 | mfs r6, resr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 486 | mfs r7, rfsr; /* save FSR */ |
Michal Simek | 131e4e9 | 2009-09-28 08:50:53 +0200 | [diff] [blame] | 487 | mts rfsr, r0; /* Clear sticky fsr */ |
Michal Simek | c318d48 | 2010-06-22 16:25:31 +0200 | [diff] [blame] | 488 | rted r0, full_exception |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 489 | addik r5, r1, PTO /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 490 | |
| 491 | /* |
| 492 | * Unaligned data trap. |
| 493 | * |
| 494 | * Unaligned data trap last on 4k page is handled here. |
| 495 | * |
| 496 | * Trap entered via exception, so EE bit is set, and interrupts |
| 497 | * are masked. This is nice, means we don't have to CLI before state save |
| 498 | * |
| 499 | * The assembler routine is in "arch/microblaze/kernel/hw_exception_handler.S" |
| 500 | */ |
| 501 | C_ENTRY(unaligned_data_trap): |
Michal Simek | 8b110d1 | 2010-06-17 16:03:05 +0200 | [diff] [blame] | 502 | /* MS: I have to save r11 value and then restore it because |
| 503 | * set_bit, clear_eip, set_ee use r11 as temp register if MSR |
| 504 | * instructions are not used. We don't need to do if MSR instructions |
| 505 | * are used and they use r0 instead of r11. |
| 506 | * I am using ENTRY_SP which should be primary used only for stack |
| 507 | * pointer saving. */ |
| 508 | swi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
| 509 | set_bip; /* equalize initial state for all possible entries */ |
| 510 | clear_eip; |
| 511 | set_ee; |
| 512 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 513 | SAVE_STATE /* Save registers.*/ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 514 | /* PC, before IRQ/trap - this is one instruction above */ |
| 515 | swi r17, r1, PTO+PT_PC; |
| 516 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 517 | /* 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] | 518 | addik r15, r0, ret_from_exc-8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 519 | mfs r3, resr /* ESR */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 520 | mfs r4, rear /* EAR */ |
Michal Simek | c318d48 | 2010-06-22 16:25:31 +0200 | [diff] [blame] | 521 | rtbd r0, _unaligned_data_exception |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 522 | addik r7, r1, PTO /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 523 | |
| 524 | /* |
| 525 | * Page fault traps. |
| 526 | * |
| 527 | * If the real exception handler (from hw_exception_handler.S) didn't find |
| 528 | * the mapping for the process, then we're thrown here to handle such situation. |
| 529 | * |
| 530 | * Trap entered via exceptions, so EE bit is set, and interrupts |
| 531 | * are masked. This is nice, means we don't have to CLI before state save |
| 532 | * |
| 533 | * Build a standard exception frame for TLB Access errors. All TLB exceptions |
| 534 | * will bail out to this point if they can't resolve the lightweight TLB fault. |
| 535 | * |
| 536 | * The C function called is in "arch/microblaze/mm/fault.c", declared as: |
| 537 | * void do_page_fault(struct pt_regs *regs, |
| 538 | * unsigned long address, |
| 539 | * unsigned long error_code) |
| 540 | */ |
| 541 | /* data and intruction trap - which is choose is resolved int fault.c */ |
| 542 | C_ENTRY(page_fault_data_trap): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 543 | SAVE_STATE /* Save registers.*/ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 544 | /* PC, before IRQ/trap - this is one instruction above */ |
| 545 | swi r17, r1, PTO+PT_PC; |
| 546 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 547 | /* 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] | 548 | addik r15, r0, ret_from_exc-8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 549 | mfs r6, rear /* parameter unsigned long address */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 550 | mfs r7, resr /* parameter unsigned long error_code */ |
Michal Simek | c318d48 | 2010-06-22 16:25:31 +0200 | [diff] [blame] | 551 | rted r0, do_page_fault |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 552 | addik r5, r1, PTO /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 553 | |
| 554 | C_ENTRY(page_fault_instr_trap): |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 555 | SAVE_STATE /* Save registers.*/ |
Michal Simek | 06a5460 | 2010-06-22 16:22:01 +0200 | [diff] [blame] | 556 | /* PC, before IRQ/trap - this is one instruction above */ |
| 557 | swi r17, r1, PTO+PT_PC; |
| 558 | tovirt(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 559 | /* 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] | 560 | addik r15, r0, ret_from_exc-8 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 561 | mfs r6, rear /* parameter unsigned long address */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 562 | ori r7, r0, 0 /* parameter unsigned long error_code */ |
Michal Simek | 9814cc1 | 2010-06-22 18:09:29 +0200 | [diff] [blame] | 563 | rted r0, do_page_fault |
| 564 | addik r5, r1, PTO /* parameter struct pt_regs * regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 565 | |
| 566 | /* Entry point used to return from an exception. */ |
| 567 | C_ENTRY(ret_from_exc): |
Michal Simek | 77f6d22 | 2010-06-22 16:39:56 +0200 | [diff] [blame] | 568 | lwi r11, r1, PTO + PT_MODE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 569 | bnei r11, 2f; /* See if returning to kernel mode, */ |
| 570 | /* ... if so, skip resched &c. */ |
| 571 | |
| 572 | /* We're returning to user mode, so check for various conditions that |
| 573 | trigger rescheduling. */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 574 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 575 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 576 | andi r11, r11, _TIF_NEED_RESCHED; |
| 577 | beqi r11, 5f; |
| 578 | |
| 579 | /* Call the scheduler before returning from a syscall/trap. */ |
| 580 | bralid r15, schedule; /* Call scheduler */ |
| 581 | nop; /* delay slot */ |
| 582 | |
| 583 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 584 | 5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 585 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 586 | andi r11, r11, _TIF_SIGPENDING; |
| 587 | beqi r11, 1f; /* Signals to handle, handle them */ |
| 588 | |
| 589 | /* |
| 590 | * Handle a signal return; Pending signals should be in r18. |
| 591 | * |
| 592 | * Not all registers are saved by the normal trap/interrupt entry |
| 593 | * points (for instance, call-saved registers (because the normal |
| 594 | * C-compiler calling sequence in the kernel makes sure they're |
| 595 | * preserved), and call-clobbered registers in the case of |
| 596 | * traps), but signal handlers may want to examine or change the |
| 597 | * complete register state. Here we save anything not saved by |
| 598 | * the normal entry sequence, so that it may be safely restored |
Michal Simek | 36f6095 | 2010-06-22 13:27:43 +0200 | [diff] [blame] | 599 | * (in a possibly modified form) after do_signal returns. */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 600 | addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 601 | addi r7, r0, 0; /* Arg 3: int in_syscall */ |
| 602 | bralid r15, do_signal; /* Handle any signals */ |
Michal Simek | 841d6e8 | 2010-01-22 14:28:36 +0100 | [diff] [blame] | 603 | add r6, r0, r0; /* Arg 2: sigset_t *oldset */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 604 | |
| 605 | /* Finally, return to user state. */ |
Michal Simek | 96014cc | 2010-06-22 14:05:43 +0200 | [diff] [blame] | 606 | 1: set_bip; /* Ints masked for state restore */ |
Michal Simek | 8633beb | 2010-02-22 13:24:43 +0100 | [diff] [blame] | 607 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 608 | VM_OFF; |
| 609 | tophys(r1,r1); |
| 610 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 611 | RESTORE_REGS; |
| 612 | addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ |
| 613 | |
| 614 | lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer. */ |
| 615 | bri 6f; |
| 616 | /* Return to kernel state. */ |
Michal Simek | 96014cc | 2010-06-22 14:05:43 +0200 | [diff] [blame] | 617 | 2: set_bip; /* Ints masked for state restore */ |
| 618 | VM_OFF; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 619 | tophys(r1,r1); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 620 | RESTORE_REGS; |
| 621 | addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ |
| 622 | |
| 623 | tovirt(r1,r1); |
| 624 | 6: |
| 625 | EXC_return: /* Make global symbol for debugging */ |
| 626 | rtbd r14, 0; /* Instructions to return from an IRQ */ |
| 627 | nop; |
| 628 | |
| 629 | /* |
| 630 | * HW EXCEPTION rutine end |
| 631 | */ |
| 632 | |
| 633 | /* |
| 634 | * Hardware maskable interrupts. |
| 635 | * |
| 636 | * The stack-pointer (r1) should have already been saved to the memory |
| 637 | * location PER_CPU(ENTRY_SP). |
| 638 | */ |
| 639 | C_ENTRY(_interrupt): |
| 640 | /* MS: we are in physical address */ |
| 641 | /* Save registers, switch to proper stack, convert SP to virtual.*/ |
| 642 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 643 | /* MS: See if already in kernel mode. */ |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 644 | mfs r1, rmsr |
Michal Simek | 5c0d72b | 2010-06-22 14:00:12 +0200 | [diff] [blame] | 645 | nop |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 646 | andi r1, r1, MSR_UMS |
| 647 | bnei r1, 1f |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 648 | |
| 649 | /* Kernel-mode state save. */ |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 650 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) |
| 651 | 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] | 652 | /* save registers */ |
| 653 | /* MS: Make room on the stack -> activation record */ |
| 654 | addik r1, r1, -STATE_SAVE_SIZE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 655 | SAVE_REGS |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 656 | brid 2f; |
Michal Simek | 0a6b08f | 2010-06-22 20:49:46 +0200 | [diff] [blame] | 657 | swi r1, r1, PTO + PT_MODE; /* 0 - user mode, 1 - kernel mode */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 658 | 1: |
| 659 | /* User-mode state save. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 660 | /* MS: get the saved current */ |
| 661 | lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
| 662 | tophys(r1,r1); |
| 663 | lwi r1, r1, TS_THREAD_INFO; |
| 664 | addik r1, r1, THREAD_SIZE; |
| 665 | tophys(r1,r1); |
| 666 | /* save registers */ |
| 667 | addik r1, r1, -STATE_SAVE_SIZE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 668 | SAVE_REGS |
| 669 | /* calculate mode */ |
| 670 | swi r0, r1, PTO + PT_MODE; |
| 671 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
| 672 | swi r11, r1, PTO+PT_R1; |
Michal Simek | 80c5ff6 | 2010-06-22 18:50:31 +0200 | [diff] [blame] | 673 | clear_ums; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 674 | 2: |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 675 | lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 676 | tovirt(r1,r1) |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 677 | addik r15, r0, irq_call; |
Michal Simek | 80c5ff6 | 2010-06-22 18:50:31 +0200 | [diff] [blame] | 678 | irq_call:rtbd r0, do_IRQ; |
| 679 | addik r5, r1, PTO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 680 | |
| 681 | /* MS: we are in virtual mode */ |
| 682 | ret_from_irq: |
| 683 | lwi r11, r1, PTO + PT_MODE; |
| 684 | bnei r11, 2f; |
| 685 | |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 686 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 687 | lwi r11, r11, TI_FLAGS; /* MS: get flags from thread info */ |
| 688 | andi r11, r11, _TIF_NEED_RESCHED; |
| 689 | beqi r11, 5f |
| 690 | bralid r15, schedule; |
| 691 | nop; /* delay slot */ |
| 692 | |
| 693 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 694 | 5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* MS: get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 695 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 696 | andi r11, r11, _TIF_SIGPENDING; |
| 697 | beqid r11, no_intr_resched |
| 698 | /* Handle a signal return; Pending signals should be in r18. */ |
| 699 | addi r7, r0, 0; /* Arg 3: int in_syscall */ |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 700 | addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 701 | bralid r15, do_signal; /* Handle any signals */ |
| 702 | add r6, r0, r0; /* Arg 2: sigset_t *oldset */ |
| 703 | |
| 704 | /* Finally, return to user state. */ |
| 705 | no_intr_resched: |
| 706 | /* Disable interrupts, we are now committed to the state restore */ |
| 707 | disable_irq |
Michal Simek | 8633beb | 2010-02-22 13:24:43 +0100 | [diff] [blame] | 708 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 709 | VM_OFF; |
| 710 | tophys(r1,r1); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 711 | RESTORE_REGS |
| 712 | addik r1, r1, STATE_SAVE_SIZE /* MS: Clean up stack space. */ |
| 713 | lwi r1, r1, PT_R1 - PT_SIZE; |
| 714 | bri 6f; |
| 715 | /* MS: Return to kernel state. */ |
Michal Simek | 7775379 | 2010-01-12 09:55:10 +0100 | [diff] [blame] | 716 | 2: |
| 717 | #ifdef CONFIG_PREEMPT |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 718 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; |
Michal Simek | 7775379 | 2010-01-12 09:55:10 +0100 | [diff] [blame] | 719 | /* MS: get preempt_count from thread info */ |
| 720 | lwi r5, r11, TI_PREEMPT_COUNT; |
| 721 | bgti r5, restore; |
| 722 | |
| 723 | lwi r5, r11, TI_FLAGS; /* get flags in thread info */ |
| 724 | andi r5, r5, _TIF_NEED_RESCHED; |
| 725 | beqi r5, restore /* if zero jump over */ |
| 726 | |
| 727 | preempt: |
| 728 | /* interrupts are off that's why I am calling preempt_chedule_irq */ |
| 729 | bralid r15, preempt_schedule_irq |
| 730 | nop |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 731 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | 7775379 | 2010-01-12 09:55:10 +0100 | [diff] [blame] | 732 | lwi r5, r11, TI_FLAGS; /* get flags in thread info */ |
| 733 | andi r5, r5, _TIF_NEED_RESCHED; |
| 734 | bnei r5, preempt /* if non zero jump to resched */ |
| 735 | restore: |
| 736 | #endif |
| 737 | VM_OFF /* MS: turn off MMU */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 738 | tophys(r1,r1) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 739 | RESTORE_REGS |
| 740 | addik r1, r1, STATE_SAVE_SIZE /* MS: Clean up stack space. */ |
| 741 | tovirt(r1,r1); |
| 742 | 6: |
| 743 | IRQ_return: /* MS: Make global symbol for debugging */ |
| 744 | rtid r14, 0 |
| 745 | nop |
| 746 | |
| 747 | /* |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 748 | * Debug trap for KGDB. Enter to _debug_exception by brki r16, 0x18 |
| 749 | * and call handling function with saved pt_regs |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 750 | */ |
| 751 | C_ENTRY(_debug_exception): |
| 752 | /* BIP bit is set on entry, no interrupts can occur */ |
| 753 | swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) |
| 754 | |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 755 | mfs r1, rmsr |
Michal Simek | 5c0d72b | 2010-06-22 14:00:12 +0200 | [diff] [blame] | 756 | nop |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 757 | andi r1, r1, MSR_UMS |
| 758 | bnei r1, 1f |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 759 | /* MS: Kernel-mode state save - kgdb */ |
Michal Simek | 653e447 | 2010-06-22 14:51:45 +0200 | [diff] [blame] | 760 | lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 761 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 762 | /* BIP bit is set on entry, no interrupts can occur */ |
| 763 | 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] | 764 | SAVE_REGS; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 765 | /* save all regs to pt_reg structure */ |
| 766 | swi r0, r1, PTO+PT_R0; /* R0 must be saved too */ |
| 767 | swi r14, r1, PTO+PT_R14 /* rewrite saved R14 value */ |
| 768 | swi r16, r1, PTO+PT_R16 |
| 769 | swi r16, r1, PTO+PT_PC; /* PC and r16 are the same */ |
| 770 | swi r17, r1, PTO+PT_R17 |
| 771 | /* save special purpose registers to pt_regs */ |
| 772 | mfs r11, rear; |
| 773 | swi r11, r1, PTO+PT_EAR; |
| 774 | mfs r11, resr; |
| 775 | swi r11, r1, PTO+PT_ESR; |
| 776 | mfs r11, rfsr; |
| 777 | swi r11, r1, PTO+PT_FSR; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 778 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 779 | /* stack pointer is in physical address at it is decrease |
| 780 | * by STATE_SAVE_SIZE but we need to get correct R1 value */ |
| 781 | addik r11, r1, CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR + STATE_SAVE_SIZE; |
| 782 | swi r11, r1, PTO+PT_R1 |
| 783 | /* MS: r31 - current pointer isn't changed */ |
| 784 | tovirt(r1,r1) |
| 785 | #ifdef CONFIG_KGDB |
| 786 | addi r5, r1, PTO /* pass pt_reg address as the first arg */ |
| 787 | la r15, r0, dbtrap_call; /* return address */ |
| 788 | rtbd r0, microblaze_kgdb_break |
| 789 | nop; |
| 790 | #endif |
| 791 | /* MS: Place handler for brki from kernel space if KGDB is OFF. |
| 792 | * It is very unlikely that another brki instruction is called. */ |
| 793 | bri 0 |
| 794 | |
| 795 | /* MS: User-mode state save - gdb */ |
| 796 | 1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 797 | tophys(r1,r1); |
| 798 | lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ |
| 799 | addik r1, r1, THREAD_SIZE; /* calculate kernel stack pointer */ |
| 800 | tophys(r1,r1); |
| 801 | |
| 802 | addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 803 | SAVE_REGS; |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 804 | swi r17, r1, PTO+PT_R17; |
| 805 | swi r16, r1, PTO+PT_R16; |
| 806 | swi r16, r1, PTO+PT_PC; /* Save LP */ |
Michal Simek | 77f6d22 | 2010-06-22 16:39:56 +0200 | [diff] [blame] | 807 | swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 808 | lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); |
| 809 | swi r11, r1, PTO+PT_R1; /* Store user SP. */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 810 | lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 811 | tovirt(r1,r1) |
Michal Simek | 06b2864 | 2010-06-22 15:25:24 +0200 | [diff] [blame] | 812 | set_vms; |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 813 | addik r5, r1, PTO; |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 814 | addik r15, r0, dbtrap_call; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 815 | 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] | 816 | rtbd r0, sw_exception |
| 817 | nop |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 818 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 819 | /* MS: The first instruction for the second part of the gdb/kgdb */ |
| 820 | set_bip; /* Ints masked for state restore */ |
Michal Simek | 77f6d22 | 2010-06-22 16:39:56 +0200 | [diff] [blame] | 821 | lwi r11, r1, PTO + PT_MODE; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 822 | bnei r11, 2f; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 823 | /* MS: Return to user space - gdb */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 824 | /* Get current task ptr into r11 */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 825 | lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 826 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 827 | andi r11, r11, _TIF_NEED_RESCHED; |
| 828 | beqi r11, 5f; |
| 829 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 830 | /* Call the scheduler before returning from a syscall/trap. */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 831 | bralid r15, schedule; /* Call scheduler */ |
| 832 | nop; /* delay slot */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 833 | |
| 834 | /* Maybe handle a signal */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 835 | 5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 836 | lwi r11, r11, TI_FLAGS; /* get flags in thread info */ |
| 837 | andi r11, r11, _TIF_SIGPENDING; |
| 838 | beqi r11, 1f; /* Signals to handle, handle them */ |
| 839 | |
Michal Simek | b9ea77e | 2010-07-28 12:40:02 +0200 | [diff] [blame] | 840 | addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 841 | addi r7, r0, 0; /* Arg 3: int in_syscall */ |
| 842 | bralid r15, do_signal; /* Handle any signals */ |
Michal Simek | 841d6e8 | 2010-01-22 14:28:36 +0100 | [diff] [blame] | 843 | add r6, r0, r0; /* Arg 2: sigset_t *oldset */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 844 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 845 | /* Finally, return to user state. */ |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 846 | 1: swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 847 | VM_OFF; |
| 848 | tophys(r1,r1); |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 849 | /* MS: Restore all regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 850 | RESTORE_REGS |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 851 | lwi r17, r1, PTO+PT_R17; |
| 852 | lwi r16, r1, PTO+PT_R16; |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 853 | addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space */ |
| 854 | lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer */ |
| 855 | DBTRAP_return_user: /* MS: Make global symbol for debugging */ |
| 856 | rtbd r16, 0; /* MS: Instructions to return from a debug trap */ |
| 857 | nop; |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 858 | |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 859 | /* MS: Return to kernel state - kgdb */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 860 | 2: VM_OFF; |
| 861 | tophys(r1,r1); |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 862 | /* MS: Restore all regs */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 863 | RESTORE_REGS |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 864 | lwi r14, r1, PTO+PT_R14; |
| 865 | lwi r16, r1, PTO+PT_PC; |
| 866 | lwi r17, r1, PTO+PT_R17; |
| 867 | addik r1, r1, STATE_SAVE_SIZE; /* MS: Clean up stack space */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 868 | tovirt(r1,r1); |
Michal Simek | 2d5973c | 2010-08-03 11:45:08 +0200 | [diff] [blame^] | 869 | DBTRAP_return_kernel: /* MS: Make global symbol for debugging */ |
| 870 | rtbd r16, 0; /* MS: Instructions to return from a debug trap */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 871 | nop; |
| 872 | |
| 873 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 874 | ENTRY(_switch_to) |
| 875 | /* prepare return value */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 876 | addk r3, r0, CURRENT_TASK |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 877 | |
| 878 | /* save registers in cpu_context */ |
| 879 | /* use r11 and r12, volatile registers, as temp register */ |
| 880 | /* give start of cpu_context for previous process */ |
| 881 | addik r11, r5, TI_CPU_CONTEXT |
| 882 | swi r1, r11, CC_R1 |
| 883 | swi r2, r11, CC_R2 |
| 884 | /* skip volatile registers. |
| 885 | * they are saved on stack when we jumped to _switch_to() */ |
| 886 | /* dedicated registers */ |
| 887 | swi r13, r11, CC_R13 |
| 888 | swi r14, r11, CC_R14 |
| 889 | swi r15, r11, CC_R15 |
| 890 | swi r16, r11, CC_R16 |
| 891 | swi r17, r11, CC_R17 |
| 892 | swi r18, r11, CC_R18 |
| 893 | /* save non-volatile registers */ |
| 894 | swi r19, r11, CC_R19 |
| 895 | swi r20, r11, CC_R20 |
| 896 | swi r21, r11, CC_R21 |
| 897 | swi r22, r11, CC_R22 |
| 898 | swi r23, r11, CC_R23 |
| 899 | swi r24, r11, CC_R24 |
| 900 | swi r25, r11, CC_R25 |
| 901 | swi r26, r11, CC_R26 |
| 902 | swi r27, r11, CC_R27 |
| 903 | swi r28, r11, CC_R28 |
| 904 | swi r29, r11, CC_R29 |
| 905 | swi r30, r11, CC_R30 |
| 906 | /* special purpose registers */ |
| 907 | mfs r12, rmsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 908 | swi r12, r11, CC_MSR |
| 909 | mfs r12, rear |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 910 | swi r12, r11, CC_EAR |
| 911 | mfs r12, resr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 912 | swi r12, r11, CC_ESR |
| 913 | mfs r12, rfsr |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 914 | swi r12, r11, CC_FSR |
| 915 | |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 916 | /* update r31, the current-give me pointer to task which will be next */ |
| 917 | lwi CURRENT_TASK, r6, TI_TASK |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 918 | /* stored it to current_save too */ |
Michal Simek | b1d70c6 | 2010-01-22 10:24:06 +0100 | [diff] [blame] | 919 | swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE) |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 920 | |
| 921 | /* get new process' cpu context and restore */ |
| 922 | /* give me start where start context of next task */ |
| 923 | addik r11, r6, TI_CPU_CONTEXT |
| 924 | |
| 925 | /* non-volatile registers */ |
| 926 | lwi r30, r11, CC_R30 |
| 927 | lwi r29, r11, CC_R29 |
| 928 | lwi r28, r11, CC_R28 |
| 929 | lwi r27, r11, CC_R27 |
| 930 | lwi r26, r11, CC_R26 |
| 931 | lwi r25, r11, CC_R25 |
| 932 | lwi r24, r11, CC_R24 |
| 933 | lwi r23, r11, CC_R23 |
| 934 | lwi r22, r11, CC_R22 |
| 935 | lwi r21, r11, CC_R21 |
| 936 | lwi r20, r11, CC_R20 |
| 937 | lwi r19, r11, CC_R19 |
| 938 | /* dedicated registers */ |
| 939 | lwi r18, r11, CC_R18 |
| 940 | lwi r17, r11, CC_R17 |
| 941 | lwi r16, r11, CC_R16 |
| 942 | lwi r15, r11, CC_R15 |
| 943 | lwi r14, r11, CC_R14 |
| 944 | lwi r13, r11, CC_R13 |
| 945 | /* skip volatile registers */ |
| 946 | lwi r2, r11, CC_R2 |
| 947 | lwi r1, r11, CC_R1 |
| 948 | |
| 949 | /* special purpose registers */ |
| 950 | lwi r12, r11, CC_FSR |
| 951 | mts rfsr, r12 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 952 | lwi r12, r11, CC_MSR |
| 953 | mts rmsr, r12 |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 954 | |
| 955 | rtsd r15, 8 |
| 956 | nop |
| 957 | |
| 958 | ENTRY(_reset) |
| 959 | brai 0x70; /* Jump back to FS-boot */ |
| 960 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 961 | /* These are compiled and loaded into high memory, then |
| 962 | * copied into place in mach_early_setup */ |
| 963 | .section .init.ivt, "ax" |
| 964 | .org 0x0 |
| 965 | /* this is very important - here is the reset vector */ |
| 966 | /* in current MMU branch you don't care what is here - it is |
| 967 | * used from bootloader site - but this is correct for FS-BOOT */ |
| 968 | brai 0x70 |
| 969 | nop |
| 970 | brai TOPHYS(_user_exception); /* syscall handler */ |
| 971 | brai TOPHYS(_interrupt); /* Interrupt handler */ |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 972 | brai TOPHYS(_debug_exception); /* debug trap handler */ |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 973 | brai TOPHYS(_hw_exception_handler); /* HW exception handler */ |
| 974 | |
Michal Simek | ca54502 | 2009-05-26 16:30:21 +0200 | [diff] [blame] | 975 | .section .rodata,"a" |
| 976 | #include "syscall_table.S" |
| 977 | |
| 978 | syscall_table_size=(.-sys_call_table) |
| 979 | |
Steven J. Magnani | ce3266c | 2010-04-27 12:37:54 -0500 | [diff] [blame] | 980 | type_SYSCALL: |
| 981 | .ascii "SYSCALL\0" |
| 982 | type_IRQ: |
| 983 | .ascii "IRQ\0" |
| 984 | type_IRQ_PREEMPT: |
| 985 | .ascii "IRQ (PREEMPTED)\0" |
| 986 | type_SYSCALL_PREEMPT: |
| 987 | .ascii " SYSCALL (PREEMPTED)\0" |
| 988 | |
| 989 | /* |
| 990 | * Trap decoding for stack unwinder |
| 991 | * Tuples are (start addr, end addr, string) |
| 992 | * If return address lies on [start addr, end addr], |
| 993 | * unwinder displays 'string' |
| 994 | */ |
| 995 | |
| 996 | .align 4 |
| 997 | .global microblaze_trap_handlers |
| 998 | microblaze_trap_handlers: |
| 999 | /* Exact matches come first */ |
| 1000 | .word ret_from_trap; .word ret_from_trap ; .word type_SYSCALL |
| 1001 | .word ret_from_irq ; .word ret_from_irq ; .word type_IRQ |
| 1002 | /* Fuzzy matches go here */ |
| 1003 | .word ret_from_irq ; .word no_intr_resched ; .word type_IRQ_PREEMPT |
| 1004 | .word ret_from_trap; .word TRAP_return ; .word type_SYSCALL_PREEMPT |
| 1005 | /* End of table */ |
| 1006 | .word 0 ; .word 0 ; .word 0 |