| 1 | #ifndef _ASM_IA64_UNWIND_H |
| 2 | #define _ASM_IA64_UNWIND_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1999-2000, 2003 Hewlett-Packard Co |
| 6 | * David Mosberger-Tang <davidm@hpl.hp.com> |
| 7 | * |
| 8 | * A simple API for unwinding kernel stacks. This is used for |
| 9 | * debugging and error reporting purposes. The kernel doesn't need |
| 10 | * full-blown stack unwinding with all the bells and whitles, so there |
| 11 | * is not much point in implementing the full IA-64 unwind API (though |
| 12 | * it would of course be possible to implement the kernel API on top |
| 13 | * of it). |
| 14 | */ |
| 15 | |
| 16 | struct task_struct; /* forward declaration */ |
| 17 | struct switch_stack; /* forward declaration */ |
| 18 | |
| 19 | enum unw_application_register { |
| 20 | UNW_AR_BSP, |
| 21 | UNW_AR_BSPSTORE, |
| 22 | UNW_AR_PFS, |
| 23 | UNW_AR_RNAT, |
| 24 | UNW_AR_UNAT, |
| 25 | UNW_AR_LC, |
| 26 | UNW_AR_EC, |
| 27 | UNW_AR_FPSR, |
| 28 | UNW_AR_RSC, |
| 29 | UNW_AR_CCV, |
| 30 | UNW_AR_CSD, |
| 31 | UNW_AR_SSD |
| 32 | }; |
| 33 | |
| 34 | /* |
| 35 | * The following declarations are private to the unwind |
| 36 | * implementation: |
| 37 | */ |
| 38 | |
| 39 | struct unw_stack { |
| 40 | unsigned long limit; |
| 41 | unsigned long top; |
| 42 | }; |
| 43 | |
| 44 | #define UNW_FLAG_INTERRUPT_FRAME (1UL << 0) |
| 45 | |
| 46 | /* |
| 47 | * No user of this module should every access this structure directly |
| 48 | * as it is subject to change. It is declared here solely so we can |
| 49 | * use automatic variables. |
| 50 | */ |
| 51 | struct unw_frame_info { |
| 52 | struct unw_stack regstk; |
| 53 | struct unw_stack memstk; |
| 54 | unsigned int flags; |
| 55 | short hint; |
| 56 | short prev_script; |
| 57 | |
| 58 | /* current frame info: */ |
| 59 | unsigned long bsp; /* backing store pointer value */ |
| 60 | unsigned long sp; /* stack pointer value */ |
| 61 | unsigned long psp; /* previous sp value */ |
| 62 | unsigned long ip; /* instruction pointer value */ |
| 63 | unsigned long pr; /* current predicate values */ |
| 64 | unsigned long *cfm_loc; /* cfm save location (or NULL) */ |
| 65 | unsigned long pt; /* struct pt_regs location */ |
| 66 | |
| 67 | struct task_struct *task; |
| 68 | struct switch_stack *sw; |
| 69 | |
| 70 | /* preserved state: */ |
| 71 | unsigned long *bsp_loc; /* previous bsp save location */ |
| 72 | unsigned long *bspstore_loc; |
| 73 | unsigned long *pfs_loc; |
| 74 | unsigned long *rnat_loc; |
| 75 | unsigned long *rp_loc; |
| 76 | unsigned long *pri_unat_loc; |
| 77 | unsigned long *unat_loc; |
| 78 | unsigned long *pr_loc; |
| 79 | unsigned long *lc_loc; |
| 80 | unsigned long *fpsr_loc; |
| 81 | struct unw_ireg { |
| 82 | unsigned long *loc; |
| 83 | struct unw_ireg_nat { |
| 84 | long type : 3; /* enum unw_nat_type */ |
| 85 | signed long off : 61; /* NaT word is at loc+nat.off */ |
| 86 | } nat; |
| 87 | } r4, r5, r6, r7; |
| 88 | unsigned long *b1_loc, *b2_loc, *b3_loc, *b4_loc, *b5_loc; |
| 89 | struct ia64_fpreg *f2_loc, *f3_loc, *f4_loc, *f5_loc, *fr_loc[16]; |
| 90 | }; |
| 91 | |
| 92 | /* |
| 93 | * The official API follows below: |
| 94 | */ |
| 95 | |
| 96 | struct unw_table_entry { |
| 97 | u64 start_offset; |
| 98 | u64 end_offset; |
| 99 | u64 info_offset; |
| 100 | }; |
| 101 | |
| 102 | /* |
| 103 | * Initialize unwind support. |
| 104 | */ |
| 105 | extern void unw_init (void); |
| 106 | |
| 107 | extern void *unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp, |
| 108 | const void *table_start, const void *table_end); |
| 109 | |
| 110 | extern void unw_remove_unwind_table (void *handle); |
| 111 | |
| 112 | /* |
| 113 | * Prepare to unwind blocked task t. |
| 114 | */ |
| 115 | extern void unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t); |
| 116 | |
| 117 | extern void unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t, |
| 118 | struct switch_stack *sw); |
| 119 | |
| 120 | /* |
| 121 | * Prepare to unwind the currently running thread. |
| 122 | */ |
| 123 | extern void unw_init_running (void (*callback)(struct unw_frame_info *info, void *arg), void *arg); |
| 124 | |
| 125 | /* |
| 126 | * Unwind to previous to frame. Returns 0 if successful, negative |
| 127 | * number in case of an error. |
| 128 | */ |
| 129 | extern int unw_unwind (struct unw_frame_info *info); |
| 130 | |
| 131 | /* |
| 132 | * Unwind until the return pointer is in user-land (or until an error |
| 133 | * occurs). Returns 0 if successful, negative number in case of |
| 134 | * error. |
| 135 | */ |
| 136 | extern int unw_unwind_to_user (struct unw_frame_info *info); |
| 137 | |
| 138 | #define unw_is_intr_frame(info) (((info)->flags & UNW_FLAG_INTERRUPT_FRAME) != 0) |
| 139 | |
| 140 | static inline int |
| 141 | unw_get_ip (struct unw_frame_info *info, unsigned long *valp) |
| 142 | { |
| 143 | *valp = (info)->ip; |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | static inline int |
| 148 | unw_get_sp (struct unw_frame_info *info, unsigned long *valp) |
| 149 | { |
| 150 | *valp = (info)->sp; |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static inline int |
| 155 | unw_get_psp (struct unw_frame_info *info, unsigned long *valp) |
| 156 | { |
| 157 | *valp = (info)->psp; |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static inline int |
| 162 | unw_get_bsp (struct unw_frame_info *info, unsigned long *valp) |
| 163 | { |
| 164 | *valp = (info)->bsp; |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | static inline int |
| 169 | unw_get_cfm (struct unw_frame_info *info, unsigned long *valp) |
| 170 | { |
| 171 | *valp = *(info)->cfm_loc; |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static inline int |
| 176 | unw_set_cfm (struct unw_frame_info *info, unsigned long val) |
| 177 | { |
| 178 | *(info)->cfm_loc = val; |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static inline int |
| 183 | unw_get_rp (struct unw_frame_info *info, unsigned long *val) |
| 184 | { |
| 185 | if (!info->rp_loc) |
| 186 | return -1; |
| 187 | *val = *info->rp_loc; |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int); |
| 192 | extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int); |
| 193 | extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int); |
| 194 | extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int); |
| 195 | extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int); |
| 196 | |
| 197 | static inline int |
| 198 | unw_set_gr (struct unw_frame_info *i, int n, unsigned long v, char nat) |
| 199 | { |
| 200 | return unw_access_gr(i, n, &v, &nat, 1); |
| 201 | } |
| 202 | |
| 203 | static inline int |
| 204 | unw_set_br (struct unw_frame_info *i, int n, unsigned long v) |
| 205 | { |
| 206 | return unw_access_br(i, n, &v, 1); |
| 207 | } |
| 208 | |
| 209 | static inline int |
| 210 | unw_set_fr (struct unw_frame_info *i, int n, struct ia64_fpreg v) |
| 211 | { |
| 212 | return unw_access_fr(i, n, &v, 1); |
| 213 | } |
| 214 | |
| 215 | static inline int |
| 216 | unw_set_ar (struct unw_frame_info *i, int n, unsigned long v) |
| 217 | { |
| 218 | return unw_access_ar(i, n, &v, 1); |
| 219 | } |
| 220 | |
| 221 | static inline int |
| 222 | unw_set_pr (struct unw_frame_info *i, unsigned long v) |
| 223 | { |
| 224 | return unw_access_pr(i, &v, 1); |
| 225 | } |
| 226 | |
| 227 | #define unw_get_gr(i,n,v,nat) unw_access_gr(i,n,v,nat,0) |
| 228 | #define unw_get_br(i,n,v) unw_access_br(i,n,v,0) |
| 229 | #define unw_get_fr(i,n,v) unw_access_fr(i,n,v,0) |
| 230 | #define unw_get_ar(i,n,v) unw_access_ar(i,n,v,0) |
| 231 | #define unw_get_pr(i,v) unw_access_pr(i,v,0) |
| 232 | |
| 233 | #endif /* _ASM_UNWIND_H */ |