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126 lines
3.1 KiB
126 lines
3.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_UNWIND_H |
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#define _ASM_X86_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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#define IRET_FRAME_OFFSET (offsetof(struct pt_regs, ip)) |
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#define IRET_FRAME_SIZE (sizeof(struct pt_regs) - IRET_FRAME_OFFSET) |
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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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int graph_idx; |
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bool error; |
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#if defined(CONFIG_UNWINDER_ORC) |
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bool signal, full_regs; |
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unsigned long sp, bp, ip; |
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struct pt_regs *regs, *prev_regs; |
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#elif defined(CONFIG_UNWINDER_FRAME_POINTER) |
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bool got_irq; |
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unsigned long *bp, *orig_sp, ip; |
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/* |
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* If non-NULL: The current frame is incomplete and doesn't contain a |
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* valid BP. When looking for the next frame, use this instead of the |
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* non-existent saved BP. |
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*/ |
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unsigned long *next_bp; |
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struct pt_regs *regs; |
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#else |
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unsigned long *sp; |
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#endif |
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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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unsigned long *unwind_get_return_address_ptr(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 inline |
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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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{ |
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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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#if defined(CONFIG_UNWINDER_ORC) || defined(CONFIG_UNWINDER_FRAME_POINTER) |
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/* |
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* If 'partial' returns true, only the iret frame registers are valid. |
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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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bool *partial) |
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{ |
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if (unwind_done(state)) |
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return NULL; |
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if (partial) { |
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#ifdef CONFIG_UNWINDER_ORC |
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*partial = !state->full_regs; |
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#else |
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*partial = false; |
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#endif |
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} |
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return state->regs; |
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} |
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#else |
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static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state, |
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bool *partial) |
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{ |
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return NULL; |
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} |
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#endif |
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#ifdef CONFIG_UNWINDER_ORC |
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void unwind_init(void); |
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void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, |
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void *orc, size_t orc_size); |
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#else |
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static inline void unwind_init(void) {} |
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static inline |
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void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, |
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void *orc, size_t orc_size) {} |
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#endif |
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/* |
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* This disables KASAN checking when reading a value from another task's stack, |
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* since the other task could be running on another CPU and could have poisoned |
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* the stack in the meantime. |
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*/ |
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#define READ_ONCE_TASK_STACK(task, x) \ |
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({ \ |
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unsigned long val; \ |
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if (task == current) \ |
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val = READ_ONCE(x); \ |
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else \ |
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val = READ_ONCE_NOCHECK(x); \ |
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val; \ |
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}) |
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static inline bool task_on_another_cpu(struct task_struct *task) |
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{ |
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#ifdef CONFIG_SMP |
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return task != current && task->on_cpu; |
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#else |
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return false; |
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#endif |
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} |
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#endif /* _ASM_X86_UNWIND_H */
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