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83 lines
2.8 KiB
83 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_S390_UNWIND_H |
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#define _ASM_S390_UNWIND_H |
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#include <linux/sched.h> |
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#include <linux/ftrace.h> |
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#include <asm/ptrace.h> |
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#include <asm/stacktrace.h> |
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/* |
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* To use the stack unwinder it has to be initialized with unwind_start. |
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* There four combinations for task and regs: |
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* 1) task==NULL, regs==NULL: the unwind starts for the task that is currently |
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* running, sp/ip picked up from the CPU registers |
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* 2) task==NULL, regs!=NULL: the unwind starts from the sp/ip found in |
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* the struct pt_regs of an interrupt frame for the current task |
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* 3) task!=NULL, regs==NULL: the unwind starts for an inactive task with |
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* the sp picked up from task->thread.ksp and the ip picked up from the |
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* return address stored by __switch_to |
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* 4) task!=NULL, regs!=NULL: the sp/ip are picked up from the interrupt |
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* frame 'regs' of a inactive task |
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* If 'first_frame' is not zero unwind_start skips unwind frames until it |
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* reaches the specified stack pointer. |
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* The end of the unwinding is indicated with unwind_done, this can be true |
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* right after unwind_start, e.g. with first_frame!=0 that can not be found. |
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* unwind_next_frame skips to the next frame. |
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* Once the unwind is completed unwind_error() can be used to check if there |
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* has been a situation where the unwinder could not correctly understand |
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* the tasks call chain. |
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*/ |
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struct unwind_state { |
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struct stack_info stack_info; |
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unsigned long stack_mask; |
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struct task_struct *task; |
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struct pt_regs *regs; |
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unsigned long sp, ip; |
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int graph_idx; |
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bool reliable; |
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bool error; |
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}; |
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void __unwind_start(struct unwind_state *state, struct task_struct *task, |
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struct pt_regs *regs, unsigned long first_frame); |
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bool unwind_next_frame(struct unwind_state *state); |
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unsigned long unwind_get_return_address(struct unwind_state *state); |
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static inline bool unwind_done(struct unwind_state *state) |
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{ |
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return state->stack_info.type == STACK_TYPE_UNKNOWN; |
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} |
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static inline bool unwind_error(struct unwind_state *state) |
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{ |
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return state->error; |
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} |
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static __always_inline void unwind_start(struct unwind_state *state, |
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struct task_struct *task, |
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struct pt_regs *regs, |
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unsigned long first_frame) |
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{ |
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task = task ?: current; |
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first_frame = first_frame ?: get_stack_pointer(task, regs); |
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__unwind_start(state, task, regs, first_frame); |
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} |
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static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state) |
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{ |
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return unwind_done(state) ? NULL : state->regs; |
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} |
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#define unwind_for_each_frame(state, task, regs, first_frame) \ |
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for (unwind_start(state, task, regs, first_frame); \ |
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!unwind_done(state); \ |
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unwind_next_frame(state)) |
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static inline void unwind_init(void) {} |
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static inline void unwind_module_init(struct module *mod, void *orc_ip, |
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size_t orc_ip_size, void *orc, |
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size_t orc_size) {} |
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#endif /* _ASM_S390_UNWIND_H */
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