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julius |
/* This file contains the exception-handling save_world and
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* restore_world routines, which need to do a run-time check to see if
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* they should save and restore the vector registers.
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*
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* Copyright (C) 2004 Free Software Foundation, Inc.
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*
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* This file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* In addition to the permissions in the GNU General Public License, the
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* Free Software Foundation gives you unlimited permission to link the
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* compiled version of this file with other programs, and to distribute
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* those programs without any restriction coming from the use of this
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* file. (The General Public License restrictions do apply in other
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* respects; for example, they cover modification of the file, and
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* distribution when not linked into another program.)
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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* As a special exception, if you link this library with files
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* compiled with GCC to produce an executable, this does not cause the
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* resulting executable to be covered by the GNU General Public License.
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* This exception does not however invalidate any other reasons why the
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* executable file might be covered by the GNU General Public License.
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*/
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.machine ppc7400
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.data
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.align 2
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#ifdef __DYNAMIC__
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.non_lazy_symbol_pointer
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L_has_vec$non_lazy_ptr:
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.indirect_symbol __cpu_has_altivec
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#ifdef __ppc64__
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.quad 0
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#else
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.long 0
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#endif
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#else
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/* For static, "pretend" we have a non-lazy-pointer. */
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L_has_vec$non_lazy_ptr:
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.long __cpu_has_altivec
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#endif
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.text
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.align 2
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/* save_world and rest_world save/restore F14-F31 and possibly V20-V31
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(assuming you have a CPU with vector registers; we use a global var
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provided by the System Framework to determine this.)
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SAVE_WORLD takes R0 (the caller`s caller`s return address) and R11
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(the stack frame size) as parameters. It returns VRsave in R0 if
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we`re on a CPU with vector regs.
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With gcc3, we now need to save and restore CR as well, since gcc3's
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scheduled prologs can cause comparisons to be moved before calls to
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save_world!
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USES: R0 R11 R12 */
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.private_extern save_world
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save_world:
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stw r0,8(r1)
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mflr r0
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bcl 20,31,Ls$pb
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Ls$pb: mflr r12
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addis r12,r12,ha16(L_has_vec$non_lazy_ptr-Ls$pb)
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lwz r12,lo16(L_has_vec$non_lazy_ptr-Ls$pb)(r12)
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mtlr r0
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lwz r12,0(r12)
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/* grab CR */
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mfcr r0
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/* test HAS_VEC */
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cmpwi r12,0
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stfd f14,-144(r1)
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stfd f15,-136(r1)
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stfd f16,-128(r1)
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stfd f17,-120(r1)
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stfd f18,-112(r1)
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stfd f19,-104(r1)
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stfd f20,-96(r1)
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stfd f21,-88(r1)
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stfd f22,-80(r1)
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stfd f23,-72(r1)
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stfd f24,-64(r1)
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stfd f25,-56(r1)
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stfd f26,-48(r1)
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stfd f27,-40(r1)
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stfd f28,-32(r1)
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stfd f29,-24(r1)
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stfd f30,-16(r1)
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stfd f31,-8(r1)
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stmw r13,-220(r1)
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/* stash CR */
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stw r0,4(r1)
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/* set R12 pointing at Vector Reg save area */
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addi r12,r1,-224
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/* allocate stack frame */
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stwux r1,r1,r11
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/* ...but return if HAS_VEC is zero */
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bne+ L$saveVMX
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/* Not forgetting to restore CR. */
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mtcr r0
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blr
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L$saveVMX:
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/* We're saving Vector regs too. */
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/* Restore CR from R0. No More Branches! */
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mtcr r0
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/* We should really use VRSAVE to figure out which vector regs
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we actually need to save and restore. Some other time :-/ */
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li r11,-192
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stvx v20,r11,r12
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li r11,-176
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stvx v21,r11,r12
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li r11,-160
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stvx v22,r11,r12
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li r11,-144
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stvx v23,r11,r12
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li r11,-128
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stvx v24,r11,r12
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li r11,-112
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stvx v25,r11,r12
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li r11,-96
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stvx v26,r11,r12
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li r11,-80
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stvx v27,r11,r12
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li r11,-64
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stvx v28,r11,r12
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li r11,-48
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stvx v29,r11,r12
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li r11,-32
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stvx v30,r11,r12
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mfspr r0,VRsave
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li r11,-16
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stvx v31,r11,r12
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/* VRsave lives at -224(R1) */
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stw r0,0(r12)
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blr
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/* eh_rest_world_r10 is jumped to, not called, so no need to worry about LR.
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R10 is the C++ EH stack adjust parameter, we return to the caller`s caller.
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USES: R0 R10 R11 R12 and R7 R8
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RETURNS: C++ EH Data registers (R3 - R6.)
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We now set up R7/R8 and jump to rest_world_eh_r7r8.
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rest_world doesn't use the R10 stack adjust parameter, nor does it
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pick up the R3-R6 exception handling stuff. */
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.private_extern rest_world
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rest_world:
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/* Pickup previous SP */
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lwz r11, 0(r1)
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li r7, 0
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lwz r8, 8(r11)
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li r10, 0
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b rest_world_eh_r7r8
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.private_extern eh_rest_world_r10
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eh_rest_world_r10:
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/* Pickup previous SP */
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lwz r11, 0(r1)
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mr r7,r10
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lwz r8, 8(r11)
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/* pickup the C++ EH data regs (R3 - R6.) */
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lwz r6,-420(r11)
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lwz r5,-424(r11)
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lwz r4,-428(r11)
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lwz r3,-432(r11)
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b rest_world_eh_r7r8
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/* rest_world_eh_r7r8 is jumped to -- not called! -- when we're doing
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the exception-handling epilog. R7 contains the offset to add to
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the SP, and R8 contains the 'real' return address.
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USES: R0 R11 R12 [R7/R8]
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RETURNS: C++ EH Data registers (R3 - R6.) */
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rest_world_eh_r7r8:
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bcl 20,31,Lr7r8$pb
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Lr7r8$pb: mflr r12
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lwz r11,0(r1)
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/* R11 := previous SP */
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addis r12,r12,ha16(L_has_vec$non_lazy_ptr-Lr7r8$pb)
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lwz r12,lo16(L_has_vec$non_lazy_ptr-Lr7r8$pb)(r12)
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lwz r0,4(r11)
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/* R0 := old CR */
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lwz r12,0(r12)
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/* R12 := HAS_VEC */
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mtcr r0
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cmpwi r12,0
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lmw r13,-220(r11)
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beq L.rest_world_fp_eh
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/* restore VRsave and V20..V31 */
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lwz r0,-224(r11)
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li r12,-416
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mtspr VRsave,r0
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lvx v20,r11,r12
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li r12,-400
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lvx v21,r11,r12
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li r12,-384
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lvx v22,r11,r12
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li r12,-368
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lvx v23,r11,r12
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li r12,-352
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lvx v24,r11,r12
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li r12,-336
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lvx v25,r11,r12
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li r12,-320
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lvx v26,r11,r12
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li r12,-304
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lvx v27,r11,r12
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li r12,-288
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lvx v28,r11,r12
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li r12,-272
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lvx v29,r11,r12
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li r12,-256
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lvx v30,r11,r12
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li r12,-240
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lvx v31,r11,r12
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L.rest_world_fp_eh:
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lfd f14,-144(r11)
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lfd f15,-136(r11)
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lfd f16,-128(r11)
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lfd f17,-120(r11)
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lfd f18,-112(r11)
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lfd f19,-104(r11)
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lfd f20,-96(r11)
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lfd f21,-88(r11)
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lfd f22,-80(r11)
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lfd f23,-72(r11)
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lfd f24,-64(r11)
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lfd f25,-56(r11)
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lfd f26,-48(r11)
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lfd f27,-40(r11)
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lfd f28,-32(r11)
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lfd f29,-24(r11)
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lfd f30,-16(r11)
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/* R8 is the exception-handler's address */
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mtctr r8
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lfd f31,-8(r11)
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/* set SP to original value + R7 offset */
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add r1,r11,r7
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bctr
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