source: trunk/packages/xen-3.1/xen-3.1/xen/arch/ia64/linux-xen/unwind_i.h @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 5.6 KB
Line 
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
15enum 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
42struct unw_info_block {
43        u64 header;
44        u64 desc[0];            /* unwind descriptors */
45        /* personality routine and language-specific data follow behind descriptors */
46};
47
48struct 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
59enum 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
76struct 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
82struct 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
87struct 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
93struct 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
117enum 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
124enum 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
139struct 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
153struct 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};
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