1 | /* vectors.s 1.1 - 95/12/04 |
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2 | * |
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3 | * This file contains the assembly code for the PowerPC |
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4 | * interrupt vectors for RTEMS. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1998. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * Copyright assigned to U.S. Government, 1994. |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in found in the file LICENSE in this distribution or at |
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12 | * http://www.OARcorp.com/rtems/license.html. |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | /* |
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18 | * The issue with this file is getting it loaded at the right place. |
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19 | * The first vector MUST be at address 0x????0100. |
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20 | * How this is achieved is dependant on the tool chain. |
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21 | * |
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22 | * However the basic mechanism for ELF assemblers is to create a |
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23 | * section called ".vectors", which will be loaded to an address |
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24 | * between 0x????0000 and 0x????0100 (inclusive) via a link script. |
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25 | * |
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26 | * The basic mechanism for XCOFF assemblers is to place it in the |
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27 | * normal text section, and arrange for this file to be located |
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28 | * at an appropriate position on the linker command line. |
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29 | * |
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30 | * The variable 'PPC_VECTOR_FILE_BASE' must be defined to be the |
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31 | * offset from 0x????0000 to the first location in the file. This |
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32 | * will usually be 0x0000 or 0x0100. |
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33 | */ |
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34 | |
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35 | #include "asm.h" |
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36 | |
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37 | #ifndef PPC_VECTOR_FILE_BASE |
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38 | #error "PPC_VECTOR_FILE_BASE is not defined." |
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39 | #endif |
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40 | |
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41 | /* Where this file will be loaded */ |
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42 | .set file_base, PPC_VECTOR_FILE_BASE |
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43 | |
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44 | /* Offset to store reg 0 */ |
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45 | |
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46 | .set IP_LINK, 0 |
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47 | #if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27) |
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48 | .set IP_0, (IP_LINK + 56) |
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49 | #else |
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50 | .set IP_0, (IP_LINK + 8) |
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51 | #endif |
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52 | .set IP_2, (IP_0 + 4) |
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53 | |
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54 | .set IP_3, (IP_2 + 4) |
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55 | .set IP_4, (IP_3 + 4) |
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56 | .set IP_5, (IP_4 + 4) |
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57 | .set IP_6, (IP_5 + 4) |
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58 | |
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59 | .set IP_7, (IP_6 + 4) |
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60 | .set IP_8, (IP_7 + 4) |
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61 | .set IP_9, (IP_8 + 4) |
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62 | .set IP_10, (IP_9 + 4) |
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63 | |
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64 | .set IP_11, (IP_10 + 4) |
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65 | .set IP_12, (IP_11 + 4) |
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66 | .set IP_13, (IP_12 + 4) |
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67 | .set IP_28, (IP_13 + 4) |
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68 | |
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69 | .set IP_29, (IP_28 + 4) |
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70 | .set IP_30, (IP_29 + 4) |
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71 | .set IP_31, (IP_30 + 4) |
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72 | .set IP_CR, (IP_31 + 4) |
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73 | |
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74 | .set IP_CTR, (IP_CR + 4) |
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75 | .set IP_XER, (IP_CTR + 4) |
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76 | .set IP_LR, (IP_XER + 4) |
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77 | .set IP_PC, (IP_LR + 4) |
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78 | |
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79 | .set IP_MSR, (IP_PC + 4) |
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80 | |
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81 | .set IP_END, (IP_MSR + 16) |
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82 | |
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83 | /* Vector offsets */ |
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84 | .set begin_vector,0xFFF00000 |
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85 | .set crit_vector,0xFFF00100 |
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86 | .set mach_vector,0xFFF00200 |
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87 | .set prot_vector,0xFFF00300 |
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88 | .set ext_vector,0xFFF00500 |
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89 | .set align_vector,0xFFF00600 |
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90 | .set prog_vector,0xFFF00700 |
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91 | .set dec_vector,0xFFF00900 |
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92 | .set sys_vector,0xFFF00C00 |
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93 | .set pit_vector,0xFFF01000 |
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94 | .set fit_vector,0xFFF01010 |
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95 | .set wadt_vector,0xFFF01020 |
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96 | .set debug_vector,0xFFF02000 |
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97 | |
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98 | /* Go to the right section */ |
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99 | #if PPC_ASM == PPC_ASM_ELF |
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100 | .section .vectors,"awx",@progbits |
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101 | #elif PPC_ASM == PPC_ASM_XCOFF |
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102 | .csect .text[PR] |
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103 | #endif |
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104 | |
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105 | PUBLIC_VAR (__vectors) |
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106 | SYM (__vectors): |
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107 | |
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108 | /* Decrementer interrupt */ |
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109 | .org dec_vector - file_base |
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110 | #if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27) |
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111 | #if (PPC_HAS_FPU) |
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112 | stwu r1, -(20*4 + 18*8 + IP_END)(r1) |
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113 | #else |
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114 | stwu r1, -(20*4 + IP_END)(r1) |
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115 | #endif |
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116 | #else |
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117 | stwu r1, -(IP_END)(r1) |
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118 | #endif |
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119 | stw r0, IP_0(r1) |
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120 | |
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121 | li r0, PPC_IRQ_DECREMENTER |
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122 | b PROC (_ISR_Handler) |
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123 | |
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