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