| 1 |
27 |
unneback |
##=============================================================================##
|
| 2 |
|
|
## context.S
|
| 3 |
|
|
##
|
| 4 |
|
|
## OpenRISC context switch code
|
| 5 |
|
|
##
|
| 6 |
|
|
##=============================================================================
|
| 7 |
|
|
#####ECOSGPLCOPYRIGHTBEGIN####
|
| 8 |
|
|
## -------------------------------------------
|
| 9 |
|
|
## This file is part of eCos, the Embedded Configurable Operating System.
|
| 10 |
|
|
## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
|
| 11 |
|
|
##
|
| 12 |
|
|
## eCos is free software; you can redistribute it and/or modify it under
|
| 13 |
|
|
## the terms of the GNU General Public License as published by the Free
|
| 14 |
|
|
## Software Foundation; either version 2 or (at your option) any later version.
|
| 15 |
|
|
##
|
| 16 |
|
|
## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
|
| 17 |
|
|
## WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
| 18 |
|
|
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
| 19 |
|
|
## for more details.
|
| 20 |
|
|
##
|
| 21 |
|
|
## You should have received a copy of the GNU General Public License along
|
| 22 |
|
|
## with eCos; if not, write to the Free Software Foundation, Inc.,
|
| 23 |
|
|
## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
| 24 |
|
|
##
|
| 25 |
|
|
## As a special exception, if other files instantiate templates or use macros
|
| 26 |
|
|
## or inline functions from this file, or you compile this file and link it
|
| 27 |
|
|
## with other works to produce a work based on this file, this file does not
|
| 28 |
|
|
## by itself cause the resulting work to be covered by the GNU General Public
|
| 29 |
|
|
## License. However the source code for this file must still be made available
|
| 30 |
|
|
## in accordance with section (3) of the GNU General Public License.
|
| 31 |
|
|
##
|
| 32 |
|
|
## This exception does not invalidate any other reasons why a work based on
|
| 33 |
|
|
## this file might be covered by the GNU General Public License.
|
| 34 |
|
|
##
|
| 35 |
|
|
## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
|
| 36 |
|
|
## at http://sources.redhat.com/ecos/ecos-license/
|
| 37 |
|
|
## -------------------------------------------
|
| 38 |
|
|
#####ECOSGPLCOPYRIGHTEND####
|
| 39 |
|
|
##=============================================================================
|
| 40 |
|
|
#######DESCRIPTIONBEGIN####
|
| 41 |
|
|
##
|
| 42 |
|
|
## Author(s): Scott Furman
|
| 43 |
|
|
## Contributors:
|
| 44 |
|
|
## Date: 2003-01-21
|
| 45 |
|
|
## Purpose: OpenRISC context switch code
|
| 46 |
|
|
## Description: This file contains implementations of the thread context
|
| 47 |
|
|
## switch routines. It also contains the longjmp() and setjmp()
|
| 48 |
|
|
## routines.
|
| 49 |
|
|
##
|
| 50 |
|
|
######DESCRIPTIONEND####
|
| 51 |
|
|
##
|
| 52 |
|
|
##=============================================================================
|
| 53 |
|
|
|
| 54 |
|
|
#include
|
| 55 |
|
|
|
| 56 |
|
|
#include
|
| 57 |
|
|
#include
|
| 58 |
|
|
|
| 59 |
|
|
|
| 60 |
|
|
|
| 61 |
|
|
#------------------------------------------------------------------------------
|
| 62 |
|
|
# hal_thread_switch_context()
|
| 63 |
|
|
# Switch thread contexts
|
| 64 |
|
|
# R3 = address of sp of next thread to execute
|
| 65 |
|
|
# R4 = address of sp save location of current thread
|
| 66 |
|
|
|
| 67 |
|
|
FUNC_START(hal_thread_switch_context)
|
| 68 |
|
|
l.addi sp,sp,-SIZEOF_OR1KREGS # space for registers
|
| 69 |
|
|
|
| 70 |
|
|
# Store General Purpose Registers (GPRs).
|
| 71 |
|
|
l.sw 2 * OR1K_GPRSIZE(sp), r2
|
| 72 |
|
|
l.sw 9 * OR1K_GPRSIZE(sp), r9
|
| 73 |
|
|
l.sw 10 * OR1K_GPRSIZE(sp), r10
|
| 74 |
|
|
l.sw 12 * OR1K_GPRSIZE(sp), r12
|
| 75 |
|
|
l.sw 14 * OR1K_GPRSIZE(sp), r14
|
| 76 |
|
|
l.sw 16 * OR1K_GPRSIZE(sp), r16
|
| 77 |
|
|
l.sw 18 * OR1K_GPRSIZE(sp), r18
|
| 78 |
|
|
l.sw 20 * OR1K_GPRSIZE(sp), r20
|
| 79 |
|
|
l.sw 22 * OR1K_GPRSIZE(sp), r22
|
| 80 |
|
|
l.sw 24 * OR1K_GPRSIZE(sp), r24
|
| 81 |
|
|
l.sw 26 * OR1K_GPRSIZE(sp), r26
|
| 82 |
|
|
l.sw 28 * OR1K_GPRSIZE(sp), r28
|
| 83 |
|
|
l.sw 30 * OR1K_GPRSIZE(sp), r30
|
| 84 |
|
|
|
| 85 |
|
|
#ifndef CYGDBG_HAL_COMMON_CONTEXT_SAVE_MINIMUM
|
| 86 |
|
|
|
| 87 |
|
|
# R0 is not typically stored because it is always zero-valued,
|
| 88 |
|
|
# but we store it here for consistency when examining registers
|
| 89 |
|
|
# in the debugger.
|
| 90 |
|
|
l.sw 0 * OR1K_GPRSIZE(sp), r0
|
| 91 |
|
|
|
| 92 |
|
|
# Caller-saved regs don't need to be preserved across
|
| 93 |
|
|
# context switches, but we do so to make debugging easier.
|
| 94 |
|
|
|
| 95 |
|
|
l.sw 3 * OR1K_GPRSIZE(sp), r3
|
| 96 |
|
|
l.sw 4 * OR1K_GPRSIZE(sp), r4
|
| 97 |
|
|
l.sw 5 * OR1K_GPRSIZE(sp), r5
|
| 98 |
|
|
l.sw 6 * OR1K_GPRSIZE(sp), r6
|
| 99 |
|
|
l.sw 7 * OR1K_GPRSIZE(sp), r7
|
| 100 |
|
|
l.sw 8 * OR1K_GPRSIZE(sp), r8
|
| 101 |
|
|
l.sw 11 * OR1K_GPRSIZE(sp), r11
|
| 102 |
|
|
l.sw 13 * OR1K_GPRSIZE(sp), r13
|
| 103 |
|
|
l.sw 15 * OR1K_GPRSIZE(sp), r15
|
| 104 |
|
|
l.sw 17 * OR1K_GPRSIZE(sp), r17
|
| 105 |
|
|
l.sw 19 * OR1K_GPRSIZE(sp), r19
|
| 106 |
|
|
l.sw 21 * OR1K_GPRSIZE(sp), r21
|
| 107 |
|
|
l.sw 23 * OR1K_GPRSIZE(sp), r23
|
| 108 |
|
|
l.sw 25 * OR1K_GPRSIZE(sp), r25
|
| 109 |
|
|
l.sw 27 * OR1K_GPRSIZE(sp), r27
|
| 110 |
|
|
l.sw 29 * OR1K_GPRSIZE(sp), r29
|
| 111 |
|
|
l.sw 31 * OR1K_GPRSIZE(sp), r31
|
| 112 |
|
|
|
| 113 |
|
|
# save MAC LO and HI regs
|
| 114 |
|
|
l.mfspr r5,r0,SPR_MACLO
|
| 115 |
|
|
l.sw OR1KREG_MACLO(sp),r5
|
| 116 |
|
|
l.mfspr r5,r0,SPR_MACHI
|
| 117 |
|
|
l.sw OR1KREG_MACHI(sp),r5
|
| 118 |
|
|
|
| 119 |
|
|
#endif
|
| 120 |
|
|
|
| 121 |
|
|
#ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT
|
| 122 |
|
|
# Make the thread context look like an exception context if thread-
|
| 123 |
|
|
# aware debugging is required. This state does not need restoring.
|
| 124 |
|
|
l.sw OR1KREG_PC(sp),r9
|
| 125 |
|
|
#endif
|
| 126 |
|
|
|
| 127 |
|
|
l.addi r5,sp,SIZEOF_OR1KREGS # save SP in reg dump
|
| 128 |
|
|
l.sw 1 * OR1K_GPRSIZE(sp), r5
|
| 129 |
|
|
|
| 130 |
|
|
l.mfspr r5,r0,SPR_SR # save SR in reg dump
|
| 131 |
|
|
l.sw OR1KREG_SR(sp), r5
|
| 132 |
|
|
|
| 133 |
|
|
# Return resulting new SP to caller via second argument
|
| 134 |
|
|
l.sw 0(r4), sp
|
| 135 |
|
|
|
| 136 |
|
|
# Now load the destination thread by dropping through
|
| 137 |
|
|
# to hal_thread_load_context...
|
| 138 |
|
|
FUNC_END(hal_thread_switch_context)
|
| 139 |
|
|
|
| 140 |
|
|
|
| 141 |
|
|
#------------------------------------------------------------------------------
|
| 142 |
|
|
# hal_thread_load_context()
|
| 143 |
|
|
# Load thread context
|
| 144 |
|
|
# R3 = address of sp of next thread to execute
|
| 145 |
|
|
# Note that this function is also the second half of hal_thread_switch_context()
|
| 146 |
|
|
# and is simply dropped into from it.
|
| 147 |
|
|
|
| 148 |
|
|
FUNC_START(hal_thread_load_context)
|
| 149 |
|
|
|
| 150 |
|
|
# Copy R3 to SP
|
| 151 |
|
|
l.lwz sp, 0(r3)
|
| 152 |
|
|
|
| 153 |
|
|
# Restore General Purpose Registers (GPRs).
|
| 154 |
|
|
# R0 is not restored because it is always zero-valued.
|
| 155 |
|
|
l.lwz r2, 2 * OR1K_GPRSIZE(sp)
|
| 156 |
|
|
l.lwz r9, 9 * OR1K_GPRSIZE(sp)
|
| 157 |
|
|
l.lwz r10, 10 * OR1K_GPRSIZE(sp)
|
| 158 |
|
|
l.lwz r12, 12 * OR1K_GPRSIZE(sp)
|
| 159 |
|
|
l.lwz r14, 14 * OR1K_GPRSIZE(sp)
|
| 160 |
|
|
l.lwz r16, 16 * OR1K_GPRSIZE(sp)
|
| 161 |
|
|
l.lwz r18, 18 * OR1K_GPRSIZE(sp)
|
| 162 |
|
|
l.lwz r20, 20 * OR1K_GPRSIZE(sp)
|
| 163 |
|
|
l.lwz r22, 22 * OR1K_GPRSIZE(sp)
|
| 164 |
|
|
l.lwz r24, 24 * OR1K_GPRSIZE(sp)
|
| 165 |
|
|
l.lwz r26, 26 * OR1K_GPRSIZE(sp)
|
| 166 |
|
|
l.lwz r28, 28 * OR1K_GPRSIZE(sp)
|
| 167 |
|
|
l.lwz r30, 30 * OR1K_GPRSIZE(sp)
|
| 168 |
|
|
|
| 169 |
|
|
# Merge interrupt-enable state of new thread into
|
| 170 |
|
|
# current SR
|
| 171 |
|
|
load32i r5,~(SPR_SR_TEE|SPR_SR_IEE)
|
| 172 |
|
|
l.mfspr r6, r0, SPR_SR
|
| 173 |
|
|
l.and r6, r5, r6
|
| 174 |
|
|
l.lwz r5, OR1KREG_SR(sp)
|
| 175 |
|
|
l.andi r5, r5, (SPR_SR_TEE|SPR_SR_IEE)
|
| 176 |
|
|
l.or r5, r5, r6
|
| 177 |
|
|
l.mtspr r0, r5, SPR_SR
|
| 178 |
|
|
|
| 179 |
|
|
#ifndef CYGDBG_HAL_COMMON_CONTEXT_SAVE_MINIMUM
|
| 180 |
|
|
|
| 181 |
|
|
# Caller-saved regs don't need to be preserved across
|
| 182 |
|
|
# context switches, but we do so here to make debugging
|
| 183 |
|
|
# easier.
|
| 184 |
|
|
|
| 185 |
|
|
# Restore MAC LO and HI regs
|
| 186 |
|
|
l.lwz r5, OR1KREG_MACLO(sp)
|
| 187 |
|
|
l.mtspr r0,r5,SPR_MACLO
|
| 188 |
|
|
l.lwz r5, OR1KREG_MACHI(sp)
|
| 189 |
|
|
l.mtspr r0,r5,SPR_MACHI
|
| 190 |
|
|
|
| 191 |
|
|
l.lwz r4, 4 * OR1K_GPRSIZE(sp)
|
| 192 |
|
|
l.lwz r5, 5 * OR1K_GPRSIZE(sp)
|
| 193 |
|
|
l.lwz r6, 6 * OR1K_GPRSIZE(sp)
|
| 194 |
|
|
l.lwz r7, 7 * OR1K_GPRSIZE(sp)
|
| 195 |
|
|
l.lwz r8, 8 * OR1K_GPRSIZE(sp)
|
| 196 |
|
|
l.lwz r11, 11 * OR1K_GPRSIZE(sp)
|
| 197 |
|
|
l.lwz r13, 13 * OR1K_GPRSIZE(sp)
|
| 198 |
|
|
l.lwz r15, 15 * OR1K_GPRSIZE(sp)
|
| 199 |
|
|
l.lwz r17, 17 * OR1K_GPRSIZE(sp)
|
| 200 |
|
|
l.lwz r19, 19 * OR1K_GPRSIZE(sp)
|
| 201 |
|
|
l.lwz r21, 21 * OR1K_GPRSIZE(sp)
|
| 202 |
|
|
l.lwz r23, 23 * OR1K_GPRSIZE(sp)
|
| 203 |
|
|
l.lwz r25, 25 * OR1K_GPRSIZE(sp)
|
| 204 |
|
|
l.lwz r27, 27 * OR1K_GPRSIZE(sp)
|
| 205 |
|
|
l.lwz r29, 29 * OR1K_GPRSIZE(sp)
|
| 206 |
|
|
l.lwz r31, 31 * OR1K_GPRSIZE(sp)
|
| 207 |
|
|
|
| 208 |
|
|
#endif
|
| 209 |
|
|
|
| 210 |
|
|
# If this is the first time we're running a thread, R3
|
| 211 |
|
|
# contains the argument to the thread entry point function,
|
| 212 |
|
|
# So we always have to restore it even though it's a callee-saved
|
| 213 |
|
|
# register.
|
| 214 |
|
|
l.lwz r3, 3 * OR1K_GPRSIZE(sp)
|
| 215 |
|
|
|
| 216 |
|
|
# Finally, restore target thread's true SP
|
| 217 |
|
|
l.lwz sp, 1 * OR1K_GPRSIZE(sp)
|
| 218 |
|
|
|
| 219 |
|
|
l.jr lr
|
| 220 |
|
|
l.nop # delay slot - must be nop
|
| 221 |
|
|
|
| 222 |
|
|
FUNC_END(hal_thread_load_context)
|
| 223 |
|
|
|
| 224 |
|
|
#------------------------------------------------------------------------------
|
| 225 |
|
|
# HAL longjmp, setjmp implementations
|
| 226 |
|
|
# hal_setjmp saves only callee-saved registers into buffer supplied in r3:
|
| 227 |
|
|
# 1,2,9,10,13,15,17,19,21,23,25,27,29,31
|
| 228 |
|
|
# Note: These definitions are repeated in hal_arch.h. If changes are required
|
| 229 |
|
|
# remember to update both sets.
|
| 230 |
|
|
|
| 231 |
|
|
#define CYGARC_JMP_BUF_R1 0
|
| 232 |
|
|
#define CYGARC_JMP_BUF_R2 1
|
| 233 |
|
|
#define CYGARC_JMP_BUF_R9 2
|
| 234 |
|
|
#define CYGARC_JMP_BUF_R10 3
|
| 235 |
|
|
#define CYGARC_JMP_BUF_R12 4
|
| 236 |
|
|
#define CYGARC_JMP_BUF_R14 5
|
| 237 |
|
|
#define CYGARC_JMP_BUF_R16 6
|
| 238 |
|
|
#define CYGARC_JMP_BUF_R18 7
|
| 239 |
|
|
#define CYGARC_JMP_BUF_R20 8
|
| 240 |
|
|
#define CYGARC_JMP_BUF_R22 9
|
| 241 |
|
|
#define CYGARC_JMP_BUF_R24 10
|
| 242 |
|
|
#define CYGARC_JMP_BUF_R26 11
|
| 243 |
|
|
#define CYGARC_JMP_BUF_R28 12
|
| 244 |
|
|
#define CYGARC_JMP_BUF_R30 13
|
| 245 |
|
|
|
| 246 |
|
|
#define CYGARC_JMP_BUF_SIZE 14
|
| 247 |
|
|
|
| 248 |
|
|
#define jmpbuf_regsize 4
|
| 249 |
|
|
|
| 250 |
|
|
FUNC_START(hal_setjmp)
|
| 251 |
|
|
# Store General Purpose Registers (GPRs).
|
| 252 |
|
|
# R0 is not stored because it is always zero-valued.
|
| 253 |
|
|
# Caller-saved registers are not stored
|
| 254 |
|
|
l.sw CYGARC_JMP_BUF_R1 * OR1K_GPRSIZE(r3), r1
|
| 255 |
|
|
l.sw CYGARC_JMP_BUF_R2 * OR1K_GPRSIZE(r3), r2
|
| 256 |
|
|
l.sw CYGARC_JMP_BUF_R9 * OR1K_GPRSIZE(r3), r9
|
| 257 |
|
|
l.sw CYGARC_JMP_BUF_R10 * OR1K_GPRSIZE(r3), r10
|
| 258 |
|
|
l.sw CYGARC_JMP_BUF_R12 * OR1K_GPRSIZE(r3), r12
|
| 259 |
|
|
l.sw CYGARC_JMP_BUF_R14 * OR1K_GPRSIZE(r3), r14
|
| 260 |
|
|
l.sw CYGARC_JMP_BUF_R16 * OR1K_GPRSIZE(r3), r16
|
| 261 |
|
|
l.sw CYGARC_JMP_BUF_R18 * OR1K_GPRSIZE(r3), r18
|
| 262 |
|
|
l.sw CYGARC_JMP_BUF_R20 * OR1K_GPRSIZE(r3), r20
|
| 263 |
|
|
l.sw CYGARC_JMP_BUF_R22 * OR1K_GPRSIZE(r3), r22
|
| 264 |
|
|
l.sw CYGARC_JMP_BUF_R24 * OR1K_GPRSIZE(r3), r24
|
| 265 |
|
|
l.sw CYGARC_JMP_BUF_R26 * OR1K_GPRSIZE(r3), r26
|
| 266 |
|
|
l.sw CYGARC_JMP_BUF_R28 * OR1K_GPRSIZE(r3), r28
|
| 267 |
|
|
l.sw CYGARC_JMP_BUF_R30 * OR1K_GPRSIZE(r3), r30
|
| 268 |
|
|
l.jr lr
|
| 269 |
|
|
l.nop # delay slot
|
| 270 |
|
|
FUNC_END(hal_setjmp)
|
| 271 |
|
|
|
| 272 |
|
|
|
| 273 |
|
|
FUNC_START(hal_longjmp)
|
| 274 |
|
|
l.lwz r1, CYGARC_JMP_BUF_R1 * OR1K_GPRSIZE(r3)
|
| 275 |
|
|
l.lwz r2, CYGARC_JMP_BUF_R2 * OR1K_GPRSIZE(r3)
|
| 276 |
|
|
l.lwz r9, CYGARC_JMP_BUF_R9 * OR1K_GPRSIZE(r3)
|
| 277 |
|
|
l.lwz r10, CYGARC_JMP_BUF_R10 * OR1K_GPRSIZE(r3)
|
| 278 |
|
|
l.lwz r12, CYGARC_JMP_BUF_R12 * OR1K_GPRSIZE(r3)
|
| 279 |
|
|
l.lwz r14, CYGARC_JMP_BUF_R14 * OR1K_GPRSIZE(r3)
|
| 280 |
|
|
l.lwz r16, CYGARC_JMP_BUF_R16 * OR1K_GPRSIZE(r3)
|
| 281 |
|
|
l.lwz r18, CYGARC_JMP_BUF_R18 * OR1K_GPRSIZE(r3)
|
| 282 |
|
|
l.lwz r20, CYGARC_JMP_BUF_R20 * OR1K_GPRSIZE(r3)
|
| 283 |
|
|
l.lwz r22, CYGARC_JMP_BUF_R22 * OR1K_GPRSIZE(r3)
|
| 284 |
|
|
l.lwz r24, CYGARC_JMP_BUF_R24 * OR1K_GPRSIZE(r3)
|
| 285 |
|
|
l.lwz r26, CYGARC_JMP_BUF_R26 * OR1K_GPRSIZE(r3)
|
| 286 |
|
|
l.lwz r28, CYGARC_JMP_BUF_R28 * OR1K_GPRSIZE(r3)
|
| 287 |
|
|
l.lwz r30, CYGARC_JMP_BUF_R30 * OR1K_GPRSIZE(r3)
|
| 288 |
|
|
|
| 289 |
|
|
l.jr lr
|
| 290 |
|
|
l.nop # delay slot
|
| 291 |
|
|
FUNC_END(hal_longjmp)
|
| 292 |
|
|
|
| 293 |
|
|
|
| 294 |
|
|
#------------------------------------------------------------------------------
|
| 295 |
|
|
# end of context.S
|
