2 * Copyright (C) 2000 Hewlett-Packard Co
3 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
5 * Kernel unwind support.
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)
15 enum unw_register_index {
21 UNW_REG_BSP, /* register stack pointer */
23 UNW_REG_PFS, /* previous function state */
26 UNW_REG_PSP, /* previous memory stack pointer */
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,
42 struct unw_info_block {
44 u64 desc[0]; /* unwind descriptors */
45 /* personality routine and language-specific data follow behind descriptors */
48 struct unw_table_entry {
55 struct unw_table *next; /* must be first member! */
57 unsigned long gp; /* global pointer for this load-module */
58 unsigned long segment_base; /* base for offsets in the unwind table entries */
61 struct unw_table_entry *array;
66 UNW_WHERE_NONE, /* register isn't saved at all */
67 UNW_WHERE_GR, /* register is saved in a general register */
68 UNW_WHERE_FR, /* register is saved in a floating-point register */
69 UNW_WHERE_BR, /* register is saved in a branch register */
70 UNW_WHERE_SPREL, /* register is saved on memstack (sp-relative) */
71 UNW_WHERE_PSPREL, /* register is saved on memstack (psp-relative) */
73 * At the end of each prologue these locations get resolved to
74 * UNW_WHERE_PSPREL and UNW_WHERE_GR, respectively:
76 UNW_WHERE_SPILL_HOME, /* register is saved in its spill home */
77 UNW_WHERE_GR_SAVE /* register is saved in next general register */
80 #define UNW_WHEN_NEVER 0x7fffffff
83 unsigned long val; /* save location: register number or offset */
84 enum unw_where where; /* where the register gets saved */
85 int when; /* when the register gets saved */
88 struct unw_state_record {
89 unsigned int first_region : 1; /* is this the first region? */
90 unsigned int done : 1; /* are we done scanning descriptors? */
91 unsigned int any_spills : 1; /* got any register spills? */
92 unsigned int in_body : 1; /* are we inside a body (as opposed to a prologue)? */
93 unsigned long flags; /* see UNW_FLAG_* in unwind.h */
95 u8 *imask; /* imask of of spill_mask record or NULL */
96 unsigned long pr_val; /* predicate values */
97 unsigned long pr_mask; /* predicate mask */
98 long spill_offset; /* psp-relative offset for spill base */
105 u8 gr_save_loc; /* next general register to use for saving a register */
106 u8 return_link_reg; /* branch register in which the return link is passed */
108 struct unw_reg_state {
109 struct unw_reg_state *next;
110 unsigned long label; /* label of this state record */
111 struct unw_reg_info reg[UNW_NUM_REGS];
112 } curr, *stack, *reg_state_list;
116 UNW_NAT_NONE, /* NaT not represented */
117 UNW_NAT_VAL, /* NaT represented by NaT value (fp reg) */
118 UNW_NAT_MEMSTK, /* NaT value is in unat word at offset OFF */
119 UNW_NAT_REGSTK /* NaT is in rnat */
122 enum unw_insn_opcode {
123 UNW_INSN_ADD, /* s[dst] += val */
124 UNW_INSN_ADD_PSP, /* s[dst] = (s.psp + val) */
125 UNW_INSN_ADD_SP, /* s[dst] = (s.sp + val) */
126 UNW_INSN_MOVE, /* s[dst] = s[val] */
127 UNW_INSN_MOVE2, /* s[dst] = s[val]; s[dst+1] = s[val+1] */
128 UNW_INSN_MOVE_STACKED, /* s[dst] = ia64_rse_skip(*s.bsp, val) */
129 UNW_INSN_SETNAT_MEMSTK, /* s[dst+1].nat.type = MEMSTK;
130 s[dst+1].nat.off = *s.pri_unat - s[dst] */
131 UNW_INSN_SETNAT_TYPE, /* s[dst+1].nat.type = val */
132 UNW_INSN_LOAD /* s[dst] = *s[val] */
136 unsigned int opc : 4;
137 unsigned int dst : 9;
142 * Preserved general static registers (r2-r5) give rise to two script
143 * instructions; everything else yields at most one instruction; at
144 * the end of the script, the psp gets popped, accounting for one more
147 #define UNW_MAX_SCRIPT_LEN (UNW_NUM_REGS + 5)
150 unsigned long ip; /* ip this script is for */
151 unsigned long pr_mask; /* mask of predicates script depends on */
152 unsigned long pr_val; /* predicate values this script is for */
154 unsigned int flags; /* see UNW_FLAG_* in unwind.h */
155 unsigned short lru_chain; /* used for least-recently-used chain */
156 unsigned short coll_chain; /* used for hash collisions */
157 unsigned short hint; /* hint for next script to try (or -1) */
158 unsigned short count; /* number of instructions in script */
159 struct unw_insn insn[UNW_MAX_SCRIPT_LEN];