1 /* $NetBSD: stackframe.h,v 1.4 2016/07/31 19:33:18 dholland Exp $ */
2
3 /*
4 * Contributed to the NetBSD foundation by Cherry G. Mathew
5 */
6
7 #define UNW_VER(x) ((x) >> 48)
8 #define UNW_FLAG_MASK 0x0000ffff00000000L
9 #define UNW_FLAG_OSMASK 0x0000f00000000000L
10 #define UNW_FLAG_EHANDLER(x) ((x) & 0x0000000100000000L)
11 #define UNW_FLAG_UHANDLER(x) ((x) & 0x0000000200000000L)
12 #define UNW_LENGTH(x) ((x) & 0x00000000ffffffffL)
13
14 /* Unwind table entry. */
15 struct uwtable_ent {
16 uint64_t start;
17 uint64_t end;
18 char *infoptr;
19 };
20
21
22 enum regrecord_type{
23 /* Register contents live ( and therefore untouched ). */
24 UNSAVED,
25 /* .offset field is the saved content. */
26 IMMED,
27 /* Register saved in one of the Branch Registers. */
28 BRREL,
29 /*
30 * Register saved in one of the Stacked GRs
31 * regstate.offset contains GR number (usually >= 32)
32 */
33 GRREL,
34 /*
35 * Register saved on the memory stack frame.
36 * regstate.offset is in words; ie; location == (sp + 4 * spoff).
37 */
38 SPREL,
39 /*
40 * Register saved on the memory stack frame but offseted via psp
41 * regstate.offset is in words; ie,
42 * location == (psp + 16 �– 4 * pspoff)
43 */
44 PSPREL
45 };
46
47
48 struct regstate {
49 enum regrecord_type where;
50 uint64_t when;
51
52 #define INVALID -1UL /* Indicates uninitialised offset value. */
53 uint64_t offset;
54 };
55
56
57 /* A staterecord contains the net state of
58 * sequentially parsing unwind descriptors.
59 * The entry state of the current prologue region
60 * is the exit state of the previous region.
61 * We record info about registers we care about
62 * ie; just enough to re-construct an unwind frame,
63 * and ignore the rest.
64 * Initial state is where = UNSAVED for all .where fields.
65 */
66
67 struct staterecord {
68 struct regstate bsp;
69 struct regstate psp;
70 struct regstate rp;
71 struct regstate pfs;
72 };
73
74 /* The unwind frame is a simpler version of the trap frame
75 * and contains a subset of preserved registers, which are
76 * useful in unwinding an ia64 stack frame.
77 * Keep this in sync with the staterecord. See: stackframe.c:updateregs()
78 */
79
80 struct unwind_frame {
81 uint64_t bsp; /* Base of the RSE. */
82 /* !!! XXX: Stack Frame discontinuities */
83 uint64_t psp; /* Mem stack (variable size) base. */
84 uint64_t rp; /* Return Pointer */
85 uint64_t pfs; /* Previous Frame size info */
86
87 /* Don't mirror anything below this line with struct staterecord */
88 uint64_t sp;
89 };
90
91
92 void buildrecordchain(uint64_t, struct recordchain *);
93 void initrecord(struct staterecord *);
94 void modifyrecord(struct staterecord *, struct recordchain *, uint64_t);
95 void pushrecord(struct staterecord *);
96 void poprecord(struct staterecord *, int);
97 void dump_staterecord(struct staterecord *);
98 void clonerecordstack(u_int);
99 void switchrecordstack(u_int);
100
101 struct uwtable_ent *get_unwind_table_entry(uint64_t);
102 void patchunwindframe(struct unwind_frame *, uint64_t, uint64_t);
103 void updateregs(struct unwind_frame *uwf, struct staterecord *, uint64_t);
104 struct uwtable_ent * get_unwind_table_entry(uint64_t ip);
105
106 struct staterecord *buildrecordstack(struct recordchain *, uint64_t);
107 void dump_recordchain(struct recordchain *);
108
109 /* Convenience macros to decompose CFM & ar.pfs. */
110 #define IA64_CFM_SOF(x) ((x) & 0x7f)
111 #define IA64_CFM_SOL(x) (((x) >> 7) & 0x7f)
112 #define IA64_CFM_SOR(x) (((x) >> 14) & 0x0f)
113 #define IA64_CFM_RRB_GR(x) (((x) >> 18) & 0x7f)
114 #define IA64_CFM_RRB_FR(x) (((x) >> 25) & 0x7f)
115 #define IA64_CFM_RRB_PR(x) (((x) >> 32) & 0x3f)
116
117 #define IA64_RNATINDEX(x) (((x) & 0x1f8) >> 3)
118
119 /* Obeys Table 6:2 RSE Operation Instructions and State Modification */
120
121 /* These functions adjust for RSE rnat saves to bsp in the forward and
122 * reverse directions respectively.
123 */
124 #define ia64_rnat_adjust ia64_bsp_adjust_call
125
126 static __inline uint64_t
ia64_bsp_adjust_call(uint64_t bsp,int sol)127 ia64_bsp_adjust_call(uint64_t bsp, int sol)
128 {
129 bsp += ((sol + (IA64_RNATINDEX(bsp) + sol) / 63) << 3);
130 return bsp;
131 }
132
133 static __inline uint64_t
ia64_bsp_adjust_ret(uint64_t bsp,int sol)134 ia64_bsp_adjust_ret(uint64_t bsp, int sol)
135 {
136 bsp -= ((sol + (62 - IA64_RNATINDEX(bsp) + sol) / 63) << 3);
137 return bsp;
138 }
139
140 static __inline uint64_t
ia64_getrse_gr(uint64_t bsp,uint64_t gr)141 ia64_getrse_gr(uint64_t bsp, uint64_t gr)
142 {
143 bsp = ia64_bsp_adjust_call(bsp, gr);
144 return *(uint64_t *) bsp;
145 }
146