1 | /* |
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2 | * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co |
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3 | * David Mosberger-Tang <davidm@hpl.hp.com> |
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4 | * |
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5 | * Kernel unwind support. |
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6 | */ |
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7 | |
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8 | #define UNW_VER(x) ((x) >> 48) |
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9 | #define UNW_FLAG_MASK 0x0000ffff00000000 |
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10 | #define UNW_FLAG_OSMASK 0x0000f00000000000 |
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11 | #define UNW_FLAG_EHANDLER(x) ((x) & 0x0000000100000000L) |
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12 | #define UNW_FLAG_UHANDLER(x) ((x) & 0x0000000200000000L) |
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13 | #define UNW_LENGTH(x) ((x) & 0x00000000ffffffffL) |
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14 | |
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15 | enum unw_register_index { |
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16 | /* primary unat: */ |
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17 | UNW_REG_PRI_UNAT_GR, |
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18 | UNW_REG_PRI_UNAT_MEM, |
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19 | |
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20 | /* register stack */ |
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21 | UNW_REG_BSP, /* register stack pointer */ |
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22 | UNW_REG_BSPSTORE, |
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23 | UNW_REG_PFS, /* previous function state */ |
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24 | UNW_REG_RNAT, |
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25 | /* memory stack */ |
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26 | UNW_REG_PSP, /* previous memory stack pointer */ |
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27 | /* return pointer: */ |
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28 | UNW_REG_RP, |
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29 | |
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30 | /* preserved registers: */ |
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31 | UNW_REG_R4, UNW_REG_R5, UNW_REG_R6, UNW_REG_R7, |
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32 | UNW_REG_UNAT, UNW_REG_PR, UNW_REG_LC, UNW_REG_FPSR, |
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33 | UNW_REG_B1, UNW_REG_B2, UNW_REG_B3, UNW_REG_B4, UNW_REG_B5, |
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34 | UNW_REG_F2, UNW_REG_F3, UNW_REG_F4, UNW_REG_F5, |
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35 | UNW_REG_F16, UNW_REG_F17, UNW_REG_F18, UNW_REG_F19, |
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36 | UNW_REG_F20, UNW_REG_F21, UNW_REG_F22, UNW_REG_F23, |
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37 | UNW_REG_F24, UNW_REG_F25, UNW_REG_F26, UNW_REG_F27, |
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38 | UNW_REG_F28, UNW_REG_F29, UNW_REG_F30, UNW_REG_F31, |
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39 | UNW_NUM_REGS |
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40 | }; |
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41 | |
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42 | struct unw_info_block { |
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43 | u64 header; |
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44 | u64 desc[0]; /* unwind descriptors */ |
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45 | /* personality routine and language-specific data follow behind descriptors */ |
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46 | }; |
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47 | |
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48 | struct unw_table { |
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49 | struct unw_table *next; /* must be first member! */ |
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50 | const char *name; |
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51 | unsigned long gp; /* global pointer for this load-module */ |
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52 | unsigned long segment_base; /* base for offsets in the unwind table entries */ |
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53 | unsigned long start; |
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54 | unsigned long end; |
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55 | const struct unw_table_entry *array; |
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56 | unsigned long length; |
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57 | }; |
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58 | |
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59 | enum unw_where { |
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60 | UNW_WHERE_NONE, /* register isn't saved at all */ |
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61 | UNW_WHERE_GR, /* register is saved in a general register */ |
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62 | UNW_WHERE_FR, /* register is saved in a floating-point register */ |
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63 | UNW_WHERE_BR, /* register is saved in a branch register */ |
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64 | UNW_WHERE_SPREL, /* register is saved on memstack (sp-relative) */ |
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65 | UNW_WHERE_PSPREL, /* register is saved on memstack (psp-relative) */ |
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66 | /* |
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67 | * At the end of each prologue these locations get resolved to |
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68 | * UNW_WHERE_PSPREL and UNW_WHERE_GR, respectively: |
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69 | */ |
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70 | UNW_WHERE_SPILL_HOME, /* register is saved in its spill home */ |
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71 | UNW_WHERE_GR_SAVE /* register is saved in next general register */ |
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72 | }; |
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73 | |
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74 | #define UNW_WHEN_NEVER 0x7fffffff |
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75 | |
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76 | struct unw_reg_info { |
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77 | unsigned long val; /* save location: register number or offset */ |
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78 | enum unw_where where; /* where the register gets saved */ |
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79 | int when; /* when the register gets saved */ |
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80 | }; |
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81 | |
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82 | struct unw_reg_state { |
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83 | struct unw_reg_state *next; /* next (outer) element on state stack */ |
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84 | struct unw_reg_info reg[UNW_NUM_REGS]; /* register save locations */ |
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85 | }; |
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86 | |
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87 | struct unw_labeled_state { |
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88 | struct unw_labeled_state *next; /* next labeled state (or NULL) */ |
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89 | unsigned long label; /* label for this state */ |
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90 | struct unw_reg_state saved_state; |
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91 | }; |
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92 | |
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93 | struct unw_state_record { |
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94 | unsigned int first_region : 1; /* is this the first region? */ |
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95 | unsigned int done : 1; /* are we done scanning descriptors? */ |
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96 | unsigned int any_spills : 1; /* got any register spills? */ |
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97 | unsigned int in_body : 1; /* are we inside a body (as opposed to a prologue)? */ |
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98 | unsigned long flags; /* see UNW_FLAG_* in unwind.h */ |
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99 | |
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100 | u8 *imask; /* imask of spill_mask record or NULL */ |
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101 | unsigned long pr_val; /* predicate values */ |
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102 | unsigned long pr_mask; /* predicate mask */ |
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103 | long spill_offset; /* psp-relative offset for spill base */ |
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104 | int region_start; |
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105 | int region_len; |
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106 | int epilogue_start; |
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107 | int epilogue_count; |
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108 | int when_target; |
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109 | |
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110 | u8 gr_save_loc; /* next general register to use for saving a register */ |
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111 | u8 return_link_reg; /* branch register in which the return link is passed */ |
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112 | |
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113 | struct unw_labeled_state *labeled_states; /* list of all labeled states */ |
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114 | struct unw_reg_state curr; /* current state */ |
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115 | }; |
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116 | |
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117 | enum unw_nat_type { |
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118 | UNW_NAT_NONE, /* NaT not represented */ |
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119 | UNW_NAT_VAL, /* NaT represented by NaT value (fp reg) */ |
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120 | UNW_NAT_MEMSTK, /* NaT value is in unat word at offset OFF */ |
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121 | UNW_NAT_REGSTK /* NaT is in rnat */ |
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122 | }; |
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123 | |
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124 | enum unw_insn_opcode { |
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125 | UNW_INSN_ADD, /* s[dst] += val */ |
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126 | UNW_INSN_ADD_PSP, /* s[dst] = (s.psp + val) */ |
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127 | UNW_INSN_ADD_SP, /* s[dst] = (s.sp + val) */ |
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128 | UNW_INSN_MOVE, /* s[dst] = s[val] */ |
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129 | UNW_INSN_MOVE2, /* s[dst] = s[val]; s[dst+1] = s[val+1] */ |
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130 | UNW_INSN_MOVE_STACKED, /* s[dst] = ia64_rse_skip(*s.bsp, val) */ |
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131 | UNW_INSN_SETNAT_MEMSTK, /* s[dst+1].nat.type = MEMSTK; |
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132 | s[dst+1].nat.off = *s.pri_unat - s[dst] */ |
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133 | UNW_INSN_SETNAT_TYPE, /* s[dst+1].nat.type = val */ |
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134 | UNW_INSN_LOAD, /* s[dst] = *s[val] */ |
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135 | UNW_INSN_MOVE_SCRATCH, /* s[dst] = scratch reg "val" */ |
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136 | UNW_INSN_MOVE_CONST, /* s[dst] = constant reg "val" */ |
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137 | }; |
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138 | |
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139 | struct unw_insn { |
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140 | unsigned int opc : 4; |
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141 | unsigned int dst : 9; |
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142 | signed int val : 19; |
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143 | }; |
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144 | |
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145 | /* |
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146 | * Preserved general static registers (r4-r7) give rise to two script |
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147 | * instructions; everything else yields at most one instruction; at |
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148 | * the end of the script, the psp gets popped, accounting for one more |
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149 | * instruction. |
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150 | */ |
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151 | #define UNW_MAX_SCRIPT_LEN (UNW_NUM_REGS + 5) |
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152 | |
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153 | struct unw_script { |
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154 | unsigned long ip; /* ip this script is for */ |
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155 | unsigned long pr_mask; /* mask of predicates script depends on */ |
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156 | unsigned long pr_val; /* predicate values this script is for */ |
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157 | rwlock_t lock; |
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158 | unsigned int flags; /* see UNW_FLAG_* in unwind.h */ |
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159 | unsigned short lru_chain; /* used for least-recently-used chain */ |
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160 | unsigned short coll_chain; /* used for hash collisions */ |
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161 | unsigned short hint; /* hint for next script to try (or -1) */ |
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162 | unsigned short count; /* number of instructions in script */ |
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163 | struct unw_insn insn[UNW_MAX_SCRIPT_LEN]; |
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164 | }; |
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