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