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-rw-r--r--arch/ia64/kernel/unwind_i.h164
1 files changed, 164 insertions, 0 deletions
diff --git a/arch/ia64/kernel/unwind_i.h b/arch/ia64/kernel/unwind_i.h
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+++ b/arch/ia64/kernel/unwind_i.h
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+/*
+ * 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];
+};