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1 /* Special support for trampolines
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2 *
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3 * Copyright (C) 1996, 1997, 2000, 2007, 2008, 2009 Free Software Foundation, Inc.
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4 * Written By Michael Meissner
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5 *
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6 * This file is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License as published by the
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8 * Free Software Foundation; either version 3, or (at your option) any
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9 * later version.
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10 *
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11 * This file is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * Under Section 7 of GPL version 3, you are granted additional
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17 * permissions described in the GCC Runtime Library Exception, version
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18 * 3.1, as published by the Free Software Foundation.
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19 *
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20 * You should have received a copy of the GNU General Public License and
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21 * a copy of the GCC Runtime Library Exception along with this program;
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22 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 * <http://www.gnu.org/licenses/>.
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24 */
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25
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26 /* Set up trampolines. */
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27
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28 .section ".text"
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29 #include "ppc-asm.h"
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30 #include "config.h"
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31
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32 #ifndef __powerpc64__
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33 .type trampoline_initial,@object
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34 .align 2
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35 trampoline_initial:
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36 mflr r0
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37 bcl 20,31,1f
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38 .Lfunc = .-trampoline_initial
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39 .long 0 /* will be replaced with function address */
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40 .Lchain = .-trampoline_initial
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41 .long 0 /* will be replaced with static chain */
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42 1: mflr r11
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43 mtlr r0
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44 lwz r0,0(r11) /* function address */
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45 lwz r11,4(r11) /* static chain */
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46 mtctr r0
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47 bctr
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48
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49 trampoline_size = .-trampoline_initial
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50 .size trampoline_initial,trampoline_size
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51
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52
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53 /* R3 = stack address to store trampoline */
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54 /* R4 = length of trampoline area */
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55 /* R5 = function address */
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56 /* R6 = static chain */
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57
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58 FUNC_START(__trampoline_setup)
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59 mflr r0 /* save return address */
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60 bcl 20,31,.LCF0 /* load up __trampoline_initial into r7 */
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61 .LCF0:
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62 mflr r11
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63 addi r7,r11,trampoline_initial-4-.LCF0 /* trampoline address -4 */
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64
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65 li r8,trampoline_size /* verify that the trampoline is big enough */
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66 cmpw cr1,r8,r4
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67 srwi r4,r4,2 /* # words to move */
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68 addi r9,r3,-4 /* adjust pointer for lwzu */
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69 mtctr r4
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70 blt cr1,.Labort
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71
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72 mtlr r0
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73
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74 /* Copy the instructions to the stack */
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75 .Lmove:
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76 lwzu r10,4(r7)
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77 stwu r10,4(r9)
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78 bdnz .Lmove
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79
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80 /* Store correct function and static chain */
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81 stw r5,.Lfunc(r3)
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82 stw r6,.Lchain(r3)
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83
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84 /* Now flush both caches */
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85 mtctr r4
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86 .Lcache:
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87 icbi 0,r3
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88 dcbf 0,r3
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89 addi r3,r3,4
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90 bdnz .Lcache
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91
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92 /* Finally synchronize things & return */
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93 sync
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94 isync
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95 blr
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96
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97 .Labort:
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98 #if (defined __PIC__ || defined __pic__) && defined HAVE_AS_REL16
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99 bcl 20,31,1f
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100 1: mflr r30
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101 addis r30,r30,_GLOBAL_OFFSET_TABLE_-1b@ha
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102 addi r30,r30,_GLOBAL_OFFSET_TABLE_-1b@l
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103 #endif
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104 bl JUMP_TARGET(abort)
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105 FUNC_END(__trampoline_setup)
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106
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107 #endif
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