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Diffstat (limited to 'arch/ia64/kernel/unwind_i.h')
| -rw-r--r-- | arch/ia64/kernel/unwind_i.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/arch/ia64/kernel/unwind_i.h b/arch/ia64/kernel/unwind_i.h new file mode 100644 index 000000000..67994a7e5 --- /dev/null +++ b/arch/ia64/kernel/unwind_i.h @@ -0,0 +1,165 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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]; +}; |