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Diffstat (limited to '')
| -rw-r--r-- | purgatory/arch/ppc/misc.S | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/purgatory/arch/ppc/misc.S b/purgatory/arch/ppc/misc.S new file mode 100644 index 0000000..bc6a18d --- /dev/null +++ b/purgatory/arch/ppc/misc.S @@ -0,0 +1,301 @@ +/* + * This file contains miscellaneous low-level functions. + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras. + * + * Rewrittten to work with /sbin/kexec 20 December 2004 Eric Biederman + * + * This program 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 of the License, or (at your option) any later version. + * + */ + +#include "ppc_asm.h" + +/* This is from linux-2.6/arch/powerpc/lib/crtsavres.S: + * + * Special support for eabi and SVR4 + * + * Copyright (C) 1995, 1996, 1998, 2000, 2001 Free Software Foundation, Inc. + * Copyright 2008 Freescale Semiconductor, Inc. + * Written By Michael Meissner + * + * Based on gcc/config/rs6000/crtsavres.asm from gcc + * + * 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. + */ +#include "config.h" + +#define _GLOBAL(name) \ + .type name,@function; \ + .globl name; \ +name: + +/* Routines for saving integer registers, called by the compiler. */ +/* Called with r11 pointing to the stack header word of the caller of the */ +/* function, just beyond the end of the integer save area. */ + +_GLOBAL(_savegpr_14) +_GLOBAL(_save32gpr_14) + stw 14,-72(11) /* save gp registers */ +_GLOBAL(_savegpr_15) +_GLOBAL(_save32gpr_15) + stw 15,-68(11) +_GLOBAL(_savegpr_16) +_GLOBAL(_save32gpr_16) + stw 16,-64(11) +_GLOBAL(_savegpr_17) +_GLOBAL(_save32gpr_17) + stw 17,-60(11) +_GLOBAL(_savegpr_18) +_GLOBAL(_save32gpr_18) + stw 18,-56(11) +_GLOBAL(_savegpr_19) +_GLOBAL(_save32gpr_19) + stw 19,-52(11) +_GLOBAL(_savegpr_20) +_GLOBAL(_save32gpr_20) + stw 20,-48(11) +_GLOBAL(_savegpr_21) +_GLOBAL(_save32gpr_21) + stw 21,-44(11) +_GLOBAL(_savegpr_22) +_GLOBAL(_save32gpr_22) + stw 22,-40(11) +_GLOBAL(_savegpr_23) +_GLOBAL(_save32gpr_23) + stw 23,-36(11) +_GLOBAL(_savegpr_24) +_GLOBAL(_save32gpr_24) + stw 24,-32(11) +_GLOBAL(_savegpr_25) +_GLOBAL(_save32gpr_25) + stw 25,-28(11) +_GLOBAL(_savegpr_26) +_GLOBAL(_save32gpr_26) + stw 26,-24(11) +_GLOBAL(_savegpr_27) +_GLOBAL(_save32gpr_27) + stw 27,-20(11) +_GLOBAL(_savegpr_28) +_GLOBAL(_save32gpr_28) + stw 28,-16(11) +_GLOBAL(_savegpr_29) +_GLOBAL(_save32gpr_29) + stw 29,-12(11) +_GLOBAL(_savegpr_30) +_GLOBAL(_save32gpr_30) + stw 30,-8(11) +_GLOBAL(_savegpr_31) +_GLOBAL(_save32gpr_31) + stw 31,-4(11) + blr + +/* Routines for restoring integer registers, called by the compiler. */ +/* Called with r11 pointing to the stack header word of the caller of the */ +/* function, just beyond the end of the integer restore area. */ + +_GLOBAL(_restgpr_14) +_GLOBAL(_rest32gpr_14) + lwz 14,-72(11) /* restore gp registers */ +_GLOBAL(_restgpr_15) +_GLOBAL(_rest32gpr_15) + lwz 15,-68(11) +_GLOBAL(_restgpr_16) +_GLOBAL(_rest32gpr_16) + lwz 16,-64(11) +_GLOBAL(_restgpr_17) +_GLOBAL(_rest32gpr_17) + lwz 17,-60(11) +_GLOBAL(_restgpr_18) +_GLOBAL(_rest32gpr_18) + lwz 18,-56(11) +_GLOBAL(_restgpr_19) +_GLOBAL(_rest32gpr_19) + lwz 19,-52(11) +_GLOBAL(_restgpr_20) +_GLOBAL(_rest32gpr_20) + lwz 20,-48(11) +_GLOBAL(_restgpr_21) +_GLOBAL(_rest32gpr_21) + lwz 21,-44(11) +_GLOBAL(_restgpr_22) +_GLOBAL(_rest32gpr_22) + lwz 22,-40(11) +_GLOBAL(_restgpr_23) +_GLOBAL(_rest32gpr_23) + lwz 23,-36(11) +_GLOBAL(_restgpr_24) +_GLOBAL(_rest32gpr_24) + lwz 24,-32(11) +_GLOBAL(_restgpr_25) +_GLOBAL(_rest32gpr_25) + lwz 25,-28(11) +_GLOBAL(_restgpr_26) +_GLOBAL(_rest32gpr_26) + lwz 26,-24(11) +_GLOBAL(_restgpr_27) +_GLOBAL(_rest32gpr_27) + lwz 27,-20(11) +_GLOBAL(_restgpr_28) +_GLOBAL(_rest32gpr_28) + lwz 28,-16(11) +_GLOBAL(_restgpr_29) +_GLOBAL(_rest32gpr_29) + lwz 29,-12(11) +_GLOBAL(_restgpr_30) +_GLOBAL(_rest32gpr_30) + lwz 30,-8(11) +_GLOBAL(_restgpr_31) +_GLOBAL(_rest32gpr_31) + lwz 31,-4(11) + blr + +/* Routines for restoring integer registers, called by the compiler. */ +/* Called with r11 pointing to the stack header word of the caller of the */ +/* function, just beyond the end of the integer restore area. */ + +_GLOBAL(_restgpr_14_x) +_GLOBAL(_rest32gpr_14_x) + lwz 14,-72(11) /* restore gp registers */ +_GLOBAL(_restgpr_15_x) +_GLOBAL(_rest32gpr_15_x) + lwz 15,-68(11) +_GLOBAL(_restgpr_16_x) +_GLOBAL(_rest32gpr_16_x) + lwz 16,-64(11) +_GLOBAL(_restgpr_17_x) +_GLOBAL(_rest32gpr_17_x) + lwz 17,-60(11) +_GLOBAL(_restgpr_18_x) +_GLOBAL(_rest32gpr_18_x) + lwz 18,-56(11) +_GLOBAL(_restgpr_19_x) +_GLOBAL(_rest32gpr_19_x) + lwz 19,-52(11) +_GLOBAL(_restgpr_20_x) +_GLOBAL(_rest32gpr_20_x) + lwz 20,-48(11) +_GLOBAL(_restgpr_21_x) +_GLOBAL(_rest32gpr_21_x) + lwz 21,-44(11) +_GLOBAL(_restgpr_22_x) +_GLOBAL(_rest32gpr_22_x) + lwz 22,-40(11) +_GLOBAL(_restgpr_23_x) +_GLOBAL(_rest32gpr_23_x) + lwz 23,-36(11) +_GLOBAL(_restgpr_24_x) +_GLOBAL(_rest32gpr_24_x) + lwz 24,-32(11) +_GLOBAL(_restgpr_25_x) +_GLOBAL(_rest32gpr_25_x) + lwz 25,-28(11) +_GLOBAL(_restgpr_26_x) +_GLOBAL(_rest32gpr_26_x) + lwz 26,-24(11) +_GLOBAL(_restgpr_27_x) +_GLOBAL(_rest32gpr_27_x) + lwz 27,-20(11) +_GLOBAL(_restgpr_28_x) +_GLOBAL(_rest32gpr_28_x) + lwz 28,-16(11) +_GLOBAL(_restgpr_29_x) +_GLOBAL(_rest32gpr_29_x) + lwz 29,-12(11) +_GLOBAL(_restgpr_30_x) +_GLOBAL(_rest32gpr_30_x) + lwz 30,-8(11) +_GLOBAL(_restgpr_31_x) +_GLOBAL(_rest32gpr_31_x) + lwz 0,4(11) + lwz 31,-4(11) + mtlr 0 + mr 1,11 + blr + + .text + +/* + * Extended precision shifts. + * + * Updated to be valid for shift counts from 0 to 63 inclusive. + * -- Gabriel + * + * R3/R4 has 64 bit value + * R5 has shift count + * result in R3/R4 + * + * ashrdi3: arithmetic right shift (sign propagation) + * lshrdi3: logical right shift + * ashldi3: left shift + */ + .globl __ashrdi3 +__ashrdi3: + subfic r6,r5,32 + srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count + addi r7,r5,32 # could be xori, or addi with -32 + slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) + rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0 + sraw r7,r3,r7 # t2 = MSW >> (count-32) + or r4,r4,r6 # LSW |= t1 + slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2 + sraw r3,r3,r5 # MSW = MSW >> count + or r4,r4,r7 # LSW |= t2 + blr + + .globl __ashldi3 +__ashldi3: + subfic r6,r5,32 + slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count + addi r7,r5,32 # could be xori, or addi with -32 + srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count) + slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32) + or r3,r3,r6 # MSW |= t1 + slw r4,r4,r5 # LSW = LSW << count + or r3,r3,r7 # MSW |= t2 + blr + + .globl __lshrdi3 +__lshrdi3: + subfic r6,r5,32 + srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count + addi r7,r5,32 # could be xori, or addi with -32 + slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) + srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32) + or r4,r4,r6 # LSW |= t1 + srw r3,r3,r5 # MSW = MSW >> count + or r4,r4,r7 # LSW |= t2 + blr + |