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TOMOYO Linux Cross Reference
Linux/arch/ia64/kernel/unwind_i.h

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  1 /*
  2  * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co
  3  *      David Mosberger-Tang <davidm@hpl.hp.com>
  4  *
  5  * Kernel unwind support.
  6  */
  7 
  8 #define UNW_VER(x)              ((x) >> 48)
  9 #define UNW_FLAG_MASK           0x0000ffff00000000
 10 #define UNW_FLAG_OSMASK         0x0000f00000000000
 11 #define UNW_FLAG_EHANDLER(x)    ((x) & 0x0000000100000000L)
 12 #define UNW_FLAG_UHANDLER(x)    ((x) & 0x0000000200000000L)
 13 #define UNW_LENGTH(x)           ((x) & 0x00000000ffffffffL)
 14 
 15 enum unw_register_index {
 16         /* primary unat: */
 17         UNW_REG_PRI_UNAT_GR,
 18         UNW_REG_PRI_UNAT_MEM,
 19 
 20         /* register stack */
 21         UNW_REG_BSP,                                    /* register stack pointer */
 22         UNW_REG_BSPSTORE,
 23         UNW_REG_PFS,                                    /* previous function state */
 24         UNW_REG_RNAT,
 25         /* memory stack */
 26         UNW_REG_PSP,                                    /* previous memory stack pointer */
 27         /* return pointer: */
 28         UNW_REG_RP,
 29 
 30         /* preserved registers: */
 31         UNW_REG_R4, UNW_REG_R5, UNW_REG_R6, UNW_REG_R7,
 32         UNW_REG_UNAT, UNW_REG_PR, UNW_REG_LC, UNW_REG_FPSR,
 33         UNW_REG_B1, UNW_REG_B2, UNW_REG_B3, UNW_REG_B4, UNW_REG_B5,
 34         UNW_REG_F2, UNW_REG_F3, UNW_REG_F4, UNW_REG_F5,
 35         UNW_REG_F16, UNW_REG_F17, UNW_REG_F18, UNW_REG_F19,
 36         UNW_REG_F20, UNW_REG_F21, UNW_REG_F22, UNW_REG_F23,
 37         UNW_REG_F24, UNW_REG_F25, UNW_REG_F26, UNW_REG_F27,
 38         UNW_REG_F28, UNW_REG_F29, UNW_REG_F30, UNW_REG_F31,
 39         UNW_NUM_REGS
 40 };
 41 
 42 struct unw_info_block {
 43         u64 header;
 44         u64 desc[0];            /* unwind descriptors */
 45         /* personality routine and language-specific data follow behind descriptors */
 46 };
 47 
 48 struct unw_table {
 49         struct unw_table *next;         /* must be first member! */
 50         const char *name;
 51         unsigned long gp;               /* global pointer for this load-module */
 52         unsigned long segment_base;     /* base for offsets in the unwind table entries */
 53         unsigned long start;
 54         unsigned long end;
 55         const struct unw_table_entry *array;
 56         unsigned long length;
 57 };
 58 
 59 enum unw_where {
 60         UNW_WHERE_NONE,                 /* register isn't saved at all */
 61         UNW_WHERE_GR,                   /* register is saved in a general register */
 62         UNW_WHERE_FR,                   /* register is saved in a floating-point register */
 63         UNW_WHERE_BR,                   /* register is saved in a branch register */
 64         UNW_WHERE_SPREL,                /* register is saved on memstack (sp-relative) */
 65         UNW_WHERE_PSPREL,               /* register is saved on memstack (psp-relative) */
 66         /*
 67          * At the end of each prologue these locations get resolved to
 68          * UNW_WHERE_PSPREL and UNW_WHERE_GR, respectively:
 69          */
 70         UNW_WHERE_SPILL_HOME,           /* register is saved in its spill home */
 71         UNW_WHERE_GR_SAVE               /* register is saved in next general register */
 72 };
 73 
 74 #define UNW_WHEN_NEVER  0x7fffffff
 75 
 76 struct unw_reg_info {
 77         unsigned long val;              /* save location: register number or offset */
 78         enum unw_where where;           /* where the register gets saved */
 79         int when;                       /* when the register gets saved */
 80 };
 81 
 82 struct unw_reg_state {
 83         struct unw_reg_state *next;             /* next (outer) element on state stack */
 84         struct unw_reg_info reg[UNW_NUM_REGS];  /* register save locations */
 85 };
 86 
 87 struct unw_labeled_state {
 88         struct unw_labeled_state *next;         /* next labeled state (or NULL) */
 89         unsigned long label;                    /* label for this state */
 90         struct unw_reg_state saved_state;
 91 };
 92 
 93 struct unw_state_record {
 94         unsigned int first_region : 1;  /* is this the first region? */
 95         unsigned int done : 1;          /* are we done scanning descriptors? */
 96         unsigned int any_spills : 1;    /* got any register spills? */
 97         unsigned int in_body : 1;       /* are we inside a body (as opposed to a prologue)? */
 98         unsigned long flags;            /* see UNW_FLAG_* in unwind.h */
 99 
100         u8 *imask;                      /* imask of spill_mask record or NULL */
101         unsigned long pr_val;           /* predicate values */
102         unsigned long pr_mask;          /* predicate mask */
103         long spill_offset;              /* psp-relative offset for spill base */
104         int region_start;
105         int region_len;
106         int epilogue_start;
107         int epilogue_count;
108         int when_target;
109 
110         u8 gr_save_loc;                 /* next general register to use for saving a register */
111         u8 return_link_reg;             /* branch register in which the return link is passed */
112 
113         struct unw_labeled_state *labeled_states;       /* list of all labeled states */
114         struct unw_reg_state curr;      /* current state */
115 };
116 
117 enum unw_nat_type {
118         UNW_NAT_NONE,           /* NaT not represented */
119         UNW_NAT_VAL,            /* NaT represented by NaT value (fp reg) */
120         UNW_NAT_MEMSTK,         /* NaT value is in unat word at offset OFF  */
121         UNW_NAT_REGSTK          /* NaT is in rnat */
122 };
123 
124 enum unw_insn_opcode {
125         UNW_INSN_ADD,                   /* s[dst] += val */
126         UNW_INSN_ADD_PSP,               /* s[dst] = (s.psp + val) */
127         UNW_INSN_ADD_SP,                /* s[dst] = (s.sp + val) */
128         UNW_INSN_MOVE,                  /* s[dst] = s[val] */
129         UNW_INSN_MOVE2,                 /* s[dst] = s[val]; s[dst+1] = s[val+1] */
130         UNW_INSN_MOVE_STACKED,          /* s[dst] = ia64_rse_skip(*s.bsp, val) */
131         UNW_INSN_SETNAT_MEMSTK,         /* s[dst+1].nat.type = MEMSTK;
132                                            s[dst+1].nat.off = *s.pri_unat - s[dst] */
133         UNW_INSN_SETNAT_TYPE,           /* s[dst+1].nat.type = val */
134         UNW_INSN_LOAD,                  /* s[dst] = *s[val] */
135         UNW_INSN_MOVE_SCRATCH,          /* s[dst] = scratch reg "val" */
136         UNW_INSN_MOVE_CONST,            /* s[dst] = constant reg "val" */
137 };
138 
139 struct unw_insn {
140         unsigned int opc        :  4;
141         unsigned int dst        :  9;
142         signed int val          : 19;
143 };
144 
145 /*
146  * Preserved general static registers (r4-r7) give rise to two script
147  * instructions; everything else yields at most one instruction; at
148  * the end of the script, the psp gets popped, accounting for one more
149  * instruction.
150  */
151 #define UNW_MAX_SCRIPT_LEN      (UNW_NUM_REGS + 5)
152 
153 struct unw_script {
154         unsigned long ip;               /* ip this script is for */
155         unsigned long pr_mask;          /* mask of predicates script depends on */
156         unsigned long pr_val;           /* predicate values this script is for */
157         rwlock_t lock;
158         unsigned int flags;             /* see UNW_FLAG_* in unwind.h */
159         unsigned short lru_chain;       /* used for least-recently-used chain */
160         unsigned short coll_chain;      /* used for hash collisions */
161         unsigned short hint;            /* hint for next script to try (or -1) */
162         unsigned short count;           /* number of instructions in script */
163         struct unw_insn insn[UNW_MAX_SCRIPT_LEN];
164 };
165 

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