| 1 |
734 |
jeremybenn |
/* This file contains the exception-handling save_world and
|
| 2 |
|
|
* restore_world routines, which need to do a run-time check to see if
|
| 3 |
|
|
* they should save and restore the vector registers.
|
| 4 |
|
|
*
|
| 5 |
|
|
* Copyright (C) 2004, 2009 Free Software Foundation, Inc.
|
| 6 |
|
|
*
|
| 7 |
|
|
* This file is free software; you can redistribute it and/or modify it
|
| 8 |
|
|
* under the terms of the GNU General Public License as published by the
|
| 9 |
|
|
* Free Software Foundation; either version 3, or (at your option) any
|
| 10 |
|
|
* later version.
|
| 11 |
|
|
*
|
| 12 |
|
|
* This file is distributed in the hope that it will be useful, but
|
| 13 |
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 14 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
| 15 |
|
|
* General Public License for more details.
|
| 16 |
|
|
*
|
| 17 |
|
|
* Under Section 7 of GPL version 3, you are granted additional
|
| 18 |
|
|
* permissions described in the GCC Runtime Library Exception, version
|
| 19 |
|
|
* 3.1, as published by the Free Software Foundation.
|
| 20 |
|
|
*
|
| 21 |
|
|
* You should have received a copy of the GNU General Public License and
|
| 22 |
|
|
* a copy of the GCC Runtime Library Exception along with this program;
|
| 23 |
|
|
* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
| 24 |
|
|
* .
|
| 25 |
|
|
*/
|
| 26 |
|
|
|
| 27 |
|
|
#ifndef __ppc64__
|
| 28 |
|
|
|
| 29 |
|
|
.machine ppc7400
|
| 30 |
|
|
.data
|
| 31 |
|
|
.align 2
|
| 32 |
|
|
|
| 33 |
|
|
#ifdef __DYNAMIC__
|
| 34 |
|
|
|
| 35 |
|
|
.non_lazy_symbol_pointer
|
| 36 |
|
|
L_has_vec$non_lazy_ptr:
|
| 37 |
|
|
.indirect_symbol __cpu_has_altivec
|
| 38 |
|
|
.long 0
|
| 39 |
|
|
#else
|
| 40 |
|
|
|
| 41 |
|
|
/* For static, "pretend" we have a non-lazy-pointer. */
|
| 42 |
|
|
|
| 43 |
|
|
L_has_vec$non_lazy_ptr:
|
| 44 |
|
|
.long __cpu_has_altivec
|
| 45 |
|
|
|
| 46 |
|
|
#endif
|
| 47 |
|
|
|
| 48 |
|
|
|
| 49 |
|
|
.text
|
| 50 |
|
|
.align 2
|
| 51 |
|
|
|
| 52 |
|
|
/* save_world and rest_world save/restore F14-F31 and possibly V20-V31
|
| 53 |
|
|
(assuming you have a CPU with vector registers; we use a global var
|
| 54 |
|
|
provided by the System Framework to determine this.)
|
| 55 |
|
|
|
| 56 |
|
|
SAVE_WORLD takes R0 (the caller`s caller`s return address) and R11
|
| 57 |
|
|
(the stack frame size) as parameters. It returns the updated VRsave
|
| 58 |
|
|
in R0 if we`re on a CPU with vector regs.
|
| 59 |
|
|
|
| 60 |
|
|
For gcc3 onward, we need to save and restore CR as well, since scheduled
|
| 61 |
|
|
prologs can cause comparisons to be moved before calls to save_world.
|
| 62 |
|
|
|
| 63 |
|
|
USES: R0 R11 R12 */
|
| 64 |
|
|
|
| 65 |
|
|
.private_extern save_world
|
| 66 |
|
|
save_world:
|
| 67 |
|
|
stw r0,8(r1)
|
| 68 |
|
|
mflr r0
|
| 69 |
|
|
bcl 20,31,Ls$pb
|
| 70 |
|
|
Ls$pb: mflr r12
|
| 71 |
|
|
addis r12,r12,ha16(L_has_vec$non_lazy_ptr-Ls$pb)
|
| 72 |
|
|
lwz r12,lo16(L_has_vec$non_lazy_ptr-Ls$pb)(r12)
|
| 73 |
|
|
mtlr r0
|
| 74 |
|
|
lwz r12,0(r12)
|
| 75 |
|
|
/* grab CR */
|
| 76 |
|
|
mfcr r0
|
| 77 |
|
|
/* test HAS_VEC */
|
| 78 |
|
|
cmpwi r12,0
|
| 79 |
|
|
stfd f14,-144(r1)
|
| 80 |
|
|
stfd f15,-136(r1)
|
| 81 |
|
|
stfd f16,-128(r1)
|
| 82 |
|
|
stfd f17,-120(r1)
|
| 83 |
|
|
stfd f18,-112(r1)
|
| 84 |
|
|
stfd f19,-104(r1)
|
| 85 |
|
|
stfd f20,-96(r1)
|
| 86 |
|
|
stfd f21,-88(r1)
|
| 87 |
|
|
stfd f22,-80(r1)
|
| 88 |
|
|
stfd f23,-72(r1)
|
| 89 |
|
|
stfd f24,-64(r1)
|
| 90 |
|
|
stfd f25,-56(r1)
|
| 91 |
|
|
stfd f26,-48(r1)
|
| 92 |
|
|
stfd f27,-40(r1)
|
| 93 |
|
|
stfd f28,-32(r1)
|
| 94 |
|
|
stfd f29,-24(r1)
|
| 95 |
|
|
stfd f30,-16(r1)
|
| 96 |
|
|
stfd f31,-8(r1)
|
| 97 |
|
|
stmw r13,-220(r1)
|
| 98 |
|
|
/* stash CR */
|
| 99 |
|
|
stw r0,4(r1)
|
| 100 |
|
|
/* set R12 pointing at Vector Reg save area */
|
| 101 |
|
|
addi r12,r1,-224
|
| 102 |
|
|
/* allocate stack frame */
|
| 103 |
|
|
stwux r1,r1,r11
|
| 104 |
|
|
/* ...but return if HAS_VEC is zero */
|
| 105 |
|
|
bne+ L$saveVMX
|
| 106 |
|
|
/* Not forgetting to restore CR. */
|
| 107 |
|
|
mtcr r0
|
| 108 |
|
|
blr
|
| 109 |
|
|
|
| 110 |
|
|
L$saveVMX:
|
| 111 |
|
|
/* We're saving Vector regs too. */
|
| 112 |
|
|
/* Restore CR from R0. No More Branches! */
|
| 113 |
|
|
mtcr r0
|
| 114 |
|
|
|
| 115 |
|
|
/* We should really use VRSAVE to figure out which vector regs
|
| 116 |
|
|
we actually need to save and restore. Some other time :-/ */
|
| 117 |
|
|
|
| 118 |
|
|
li r11,-192
|
| 119 |
|
|
stvx v20,r11,r12
|
| 120 |
|
|
li r11,-176
|
| 121 |
|
|
stvx v21,r11,r12
|
| 122 |
|
|
li r11,-160
|
| 123 |
|
|
stvx v22,r11,r12
|
| 124 |
|
|
li r11,-144
|
| 125 |
|
|
stvx v23,r11,r12
|
| 126 |
|
|
li r11,-128
|
| 127 |
|
|
stvx v24,r11,r12
|
| 128 |
|
|
li r11,-112
|
| 129 |
|
|
stvx v25,r11,r12
|
| 130 |
|
|
li r11,-96
|
| 131 |
|
|
stvx v26,r11,r12
|
| 132 |
|
|
li r11,-80
|
| 133 |
|
|
stvx v27,r11,r12
|
| 134 |
|
|
li r11,-64
|
| 135 |
|
|
stvx v28,r11,r12
|
| 136 |
|
|
li r11,-48
|
| 137 |
|
|
stvx v29,r11,r12
|
| 138 |
|
|
li r11,-32
|
| 139 |
|
|
stvx v30,r11,r12
|
| 140 |
|
|
mfspr r0,VRsave
|
| 141 |
|
|
li r11,-16
|
| 142 |
|
|
stvx v31,r11,r12
|
| 143 |
|
|
stw r0,0(r12) /* VRsave lives at -224(R1). */
|
| 144 |
|
|
ori r0,r0,0xfff /* We just saved these. */
|
| 145 |
|
|
mtspr VRsave,r0
|
| 146 |
|
|
blr
|
| 147 |
|
|
|
| 148 |
|
|
/* rest_world is jumped to, not called, so no need to worry about LR.
|
| 149 |
|
|
clobbers R0, R7, R11 and R12. This just undoes the work done above. */
|
| 150 |
|
|
|
| 151 |
|
|
.private_extern rest_world
|
| 152 |
|
|
rest_world:
|
| 153 |
|
|
|
| 154 |
|
|
lwz r11, 0(r1) /* Pickup previous SP */
|
| 155 |
|
|
li r7, 0 /* Stack offset is zero, r10 is ignored. */
|
| 156 |
|
|
b Lrest_world_eh_r7
|
| 157 |
|
|
|
| 158 |
|
|
/* eh_rest_world_r10 is jumped to, not called, so no need to worry about LR.
|
| 159 |
|
|
R10 is the C++ EH stack adjust parameter, we return to the caller`s caller.
|
| 160 |
|
|
|
| 161 |
|
|
clobbers: R0, R7, R11 and R12
|
| 162 |
|
|
uses : R10
|
| 163 |
|
|
RETURNS : C++ EH Data registers (R3 - R6). */
|
| 164 |
|
|
|
| 165 |
|
|
.private_extern eh_rest_world_r10
|
| 166 |
|
|
eh_rest_world_r10:
|
| 167 |
|
|
|
| 168 |
|
|
lwz r11, 0(r1) /* Pickup previous SP */
|
| 169 |
|
|
mr r7,r10 /* Stack offset. */
|
| 170 |
|
|
|
| 171 |
|
|
/* pickup the C++ EH data regs (R3 - R6.) */
|
| 172 |
|
|
lwz r6,-420(r11)
|
| 173 |
|
|
lwz r5,-424(r11)
|
| 174 |
|
|
lwz r4,-428(r11)
|
| 175 |
|
|
lwz r3,-432(r11)
|
| 176 |
|
|
|
| 177 |
|
|
/* Fall through to Lrest_world_eh_r7. */
|
| 178 |
|
|
|
| 179 |
|
|
/* When we are doing the exception-handling epilog, R7 contains the offset to
|
| 180 |
|
|
add to the SP.
|
| 181 |
|
|
|
| 182 |
|
|
clobbers: R0, R11 and R12
|
| 183 |
|
|
uses : R7. */
|
| 184 |
|
|
|
| 185 |
|
|
Lrest_world_eh_r7:
|
| 186 |
|
|
/* See if we have Altivec. */
|
| 187 |
|
|
bcl 20,31,Lr7$pb
|
| 188 |
|
|
Lr7$pb: mflr r12
|
| 189 |
|
|
|
| 190 |
|
|
addis r12,r12,ha16(L_has_vec$non_lazy_ptr-Lr7$pb)
|
| 191 |
|
|
lwz r12,lo16(L_has_vec$non_lazy_ptr-Lr7$pb)(r12)
|
| 192 |
|
|
lwz r12,0(r12) /* R12 := HAS_VEC */
|
| 193 |
|
|
cmpwi r12,0
|
| 194 |
|
|
lmw r13,-220(r11)
|
| 195 |
|
|
beq L.rest_world_fp_eh
|
| 196 |
|
|
|
| 197 |
|
|
/* We have Altivec, restore VRsave and V20..V31 */
|
| 198 |
|
|
lwz r0,-224(r11)
|
| 199 |
|
|
li r12,-416
|
| 200 |
|
|
mtspr VRsave,r0
|
| 201 |
|
|
lvx v20,r11,r12
|
| 202 |
|
|
li r12,-400
|
| 203 |
|
|
lvx v21,r11,r12
|
| 204 |
|
|
li r12,-384
|
| 205 |
|
|
lvx v22,r11,r12
|
| 206 |
|
|
li r12,-368
|
| 207 |
|
|
lvx v23,r11,r12
|
| 208 |
|
|
li r12,-352
|
| 209 |
|
|
lvx v24,r11,r12
|
| 210 |
|
|
li r12,-336
|
| 211 |
|
|
lvx v25,r11,r12
|
| 212 |
|
|
li r12,-320
|
| 213 |
|
|
lvx v26,r11,r12
|
| 214 |
|
|
li r12,-304
|
| 215 |
|
|
lvx v27,r11,r12
|
| 216 |
|
|
li r12,-288
|
| 217 |
|
|
lvx v28,r11,r12
|
| 218 |
|
|
li r12,-272
|
| 219 |
|
|
lvx v29,r11,r12
|
| 220 |
|
|
li r12,-256
|
| 221 |
|
|
lvx v30,r11,r12
|
| 222 |
|
|
li r12,-240
|
| 223 |
|
|
lvx v31,r11,r12
|
| 224 |
|
|
|
| 225 |
|
|
L.rest_world_fp_eh:
|
| 226 |
|
|
lwz r0,4(r11) /* recover saved CR */
|
| 227 |
|
|
lfd f14,-144(r11)
|
| 228 |
|
|
lfd f15,-136(r11)
|
| 229 |
|
|
lfd f16,-128(r11)
|
| 230 |
|
|
lfd f17,-120(r11)
|
| 231 |
|
|
lfd f18,-112(r11)
|
| 232 |
|
|
lfd f19,-104(r11)
|
| 233 |
|
|
lfd f20,-96(r11)
|
| 234 |
|
|
lfd f21,-88(r11)
|
| 235 |
|
|
lfd f22,-80(r11)
|
| 236 |
|
|
lfd f23,-72(r11)
|
| 237 |
|
|
lfd f24,-64(r11)
|
| 238 |
|
|
lfd f25,-56(r11)
|
| 239 |
|
|
lfd f26,-48(r11)
|
| 240 |
|
|
lfd f27,-40(r11)
|
| 241 |
|
|
lfd f28,-32(r11)
|
| 242 |
|
|
lfd f29,-24(r11)
|
| 243 |
|
|
lfd f30,-16(r11)
|
| 244 |
|
|
mtcr r0 /* restore the saved cr. */
|
| 245 |
|
|
lwz r0, 8(r11) /* Pick up the 'real' return address. */
|
| 246 |
|
|
lfd f31,-8(r11)
|
| 247 |
|
|
mtctr r0 /* exception-handler ret. address */
|
| 248 |
|
|
add r1,r11,r7 /* set SP to original value + R7 offset */
|
| 249 |
|
|
bctr
|
| 250 |
|
|
#endif
|
| 251 |
|
|
/* we should never be called on ppc64 for this ... */
|
| 252 |
|
|
/* Done. */
|
