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unwind_i.h

/*
 * 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];
};

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