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234 lines
5.7 KiB
234 lines
5.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_IA64_UNWIND_H |
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#define _ASM_IA64_UNWIND_H |
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/* |
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* Copyright (C) 1999-2000, 2003 Hewlett-Packard Co |
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* David Mosberger-Tang <[email protected]> |
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* |
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* A simple API for unwinding kernel stacks. This is used for |
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* debugging and error reporting purposes. The kernel doesn't need |
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* full-blown stack unwinding with all the bells and whitles, so there |
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* is not much point in implementing the full IA-64 unwind API (though |
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* it would of course be possible to implement the kernel API on top |
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* of it). |
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*/ |
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struct task_struct; /* forward declaration */ |
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struct switch_stack; /* forward declaration */ |
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enum unw_application_register { |
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UNW_AR_BSP, |
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UNW_AR_BSPSTORE, |
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UNW_AR_PFS, |
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UNW_AR_RNAT, |
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UNW_AR_UNAT, |
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UNW_AR_LC, |
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UNW_AR_EC, |
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UNW_AR_FPSR, |
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UNW_AR_RSC, |
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UNW_AR_CCV, |
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UNW_AR_CSD, |
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UNW_AR_SSD |
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}; |
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/* |
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* The following declarations are private to the unwind |
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* implementation: |
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*/ |
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struct unw_stack { |
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unsigned long limit; |
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unsigned long top; |
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}; |
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#define UNW_FLAG_INTERRUPT_FRAME (1UL << 0) |
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/* |
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* No user of this module should every access this structure directly |
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* as it is subject to change. It is declared here solely so we can |
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* use automatic variables. |
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*/ |
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struct unw_frame_info { |
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struct unw_stack regstk; |
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struct unw_stack memstk; |
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unsigned int flags; |
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short hint; |
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short prev_script; |
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/* current frame info: */ |
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unsigned long bsp; /* backing store pointer value */ |
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unsigned long sp; /* stack pointer value */ |
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unsigned long psp; /* previous sp value */ |
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unsigned long ip; /* instruction pointer value */ |
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unsigned long pr; /* current predicate values */ |
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unsigned long *cfm_loc; /* cfm save location (or NULL) */ |
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unsigned long pt; /* struct pt_regs location */ |
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struct task_struct *task; |
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struct switch_stack *sw; |
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/* preserved state: */ |
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unsigned long *bsp_loc; /* previous bsp save location */ |
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unsigned long *bspstore_loc; |
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unsigned long *pfs_loc; |
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unsigned long *rnat_loc; |
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unsigned long *rp_loc; |
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unsigned long *pri_unat_loc; |
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unsigned long *unat_loc; |
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unsigned long *pr_loc; |
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unsigned long *lc_loc; |
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unsigned long *fpsr_loc; |
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struct unw_ireg { |
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unsigned long *loc; |
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struct unw_ireg_nat { |
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unsigned long type : 3; /* enum unw_nat_type */ |
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signed long off : 61; /* NaT word is at loc+nat.off */ |
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} nat; |
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} r4, r5, r6, r7; |
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unsigned long *b1_loc, *b2_loc, *b3_loc, *b4_loc, *b5_loc; |
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struct ia64_fpreg *f2_loc, *f3_loc, *f4_loc, *f5_loc, *fr_loc[16]; |
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}; |
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/* |
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* The official API follows below: |
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*/ |
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struct unw_table_entry { |
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u64 start_offset; |
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u64 end_offset; |
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u64 info_offset; |
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}; |
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/* |
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* Initialize unwind support. |
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*/ |
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extern void unw_init (void); |
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extern void *unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp, |
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const void *table_start, const void *table_end); |
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extern void unw_remove_unwind_table (void *handle); |
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/* |
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* Prepare to unwind blocked task t. |
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*/ |
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extern void unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t); |
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extern void unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t, |
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struct switch_stack *sw); |
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/* |
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* Prepare to unwind the currently running thread. |
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*/ |
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extern void unw_init_running (void (*callback)(struct unw_frame_info *info, void *arg), void *arg); |
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/* |
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* Unwind to previous to frame. Returns 0 if successful, negative |
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* number in case of an error. |
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*/ |
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extern int unw_unwind (struct unw_frame_info *info); |
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/* |
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* Unwind until the return pointer is in user-land (or until an error |
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* occurs). Returns 0 if successful, negative number in case of |
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* error. |
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*/ |
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extern int unw_unwind_to_user (struct unw_frame_info *info); |
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#define unw_is_intr_frame(info) (((info)->flags & UNW_FLAG_INTERRUPT_FRAME) != 0) |
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static inline int |
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unw_get_ip (struct unw_frame_info *info, unsigned long *valp) |
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{ |
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*valp = (info)->ip; |
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return 0; |
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} |
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static inline int |
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unw_get_sp (struct unw_frame_info *info, unsigned long *valp) |
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{ |
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*valp = (info)->sp; |
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return 0; |
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} |
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static inline int |
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unw_get_psp (struct unw_frame_info *info, unsigned long *valp) |
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{ |
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*valp = (info)->psp; |
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return 0; |
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} |
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static inline int |
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unw_get_bsp (struct unw_frame_info *info, unsigned long *valp) |
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{ |
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*valp = (info)->bsp; |
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return 0; |
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} |
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static inline int |
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unw_get_cfm (struct unw_frame_info *info, unsigned long *valp) |
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{ |
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*valp = *(info)->cfm_loc; |
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return 0; |
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} |
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static inline int |
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unw_set_cfm (struct unw_frame_info *info, unsigned long val) |
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{ |
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*(info)->cfm_loc = val; |
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return 0; |
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} |
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static inline int |
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unw_get_rp (struct unw_frame_info *info, unsigned long *val) |
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{ |
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if (!info->rp_loc) |
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return -1; |
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*val = *info->rp_loc; |
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return 0; |
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} |
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extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int); |
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extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int); |
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extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int); |
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extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int); |
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extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int); |
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static inline int |
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unw_set_gr (struct unw_frame_info *i, int n, unsigned long v, char nat) |
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{ |
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return unw_access_gr(i, n, &v, &nat, 1); |
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} |
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static inline int |
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unw_set_br (struct unw_frame_info *i, int n, unsigned long v) |
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{ |
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return unw_access_br(i, n, &v, 1); |
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} |
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static inline int |
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unw_set_fr (struct unw_frame_info *i, int n, struct ia64_fpreg v) |
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{ |
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return unw_access_fr(i, n, &v, 1); |
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} |
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static inline int |
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unw_set_ar (struct unw_frame_info *i, int n, unsigned long v) |
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{ |
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return unw_access_ar(i, n, &v, 1); |
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} |
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static inline int |
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unw_set_pr (struct unw_frame_info *i, unsigned long v) |
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{ |
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return unw_access_pr(i, &v, 1); |
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} |
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#define unw_get_gr(i,n,v,nat) unw_access_gr(i,n,v,nat,0) |
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#define unw_get_br(i,n,v) unw_access_br(i,n,v,0) |
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#define unw_get_fr(i,n,v) unw_access_fr(i,n,v,0) |
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#define unw_get_ar(i,n,v) unw_access_ar(i,n,v,0) |
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#define unw_get_pr(i,v) unw_access_pr(i,v,0) |
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#endif /* _ASM_UNWIND_H */
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