99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/*
|
||
|
|
* Most of this ideas comes from x86.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2022 Loongson Technology Corporation Limited
|
||
|
|
*/
|
||
|
|
#ifndef _ASM_UNWIND_H
|
||
|
|
#define _ASM_UNWIND_H
|
||
|
|
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/ftrace.h>
|
||
|
|
|
||
|
|
#include <asm/ptrace.h>
|
||
|
|
#include <asm/stacktrace.h>
|
||
|
|
|
||
|
|
enum unwinder_type {
|
||
|
|
UNWINDER_GUESS,
|
||
|
|
UNWINDER_PROLOGUE,
|
||
|
|
UNWINDER_ORC,
|
||
|
|
};
|
||
|
|
|
||
|
|
struct unwind_state {
|
||
|
|
char type; /* UNWINDER_XXX */
|
||
|
|
struct stack_info stack_info;
|
||
|
|
struct task_struct *task;
|
||
|
|
bool first, error, reset;
|
||
|
|
int graph_idx;
|
||
|
|
unsigned long sp, fp, pc, ra;
|
||
|
|
};
|
||
|
|
|
||
|
|
bool default_next_frame(struct unwind_state *state);
|
||
|
|
|
||
|
|
void unwind_start(struct unwind_state *state,
|
||
|
|
struct task_struct *task, struct pt_regs *regs);
|
||
|
|
bool unwind_next_frame(struct unwind_state *state);
|
||
|
|
unsigned long unwind_get_return_address(struct unwind_state *state);
|
||
|
|
|
||
|
|
static inline bool unwind_done(struct unwind_state *state)
|
||
|
|
{
|
||
|
|
return state->stack_info.type == STACK_TYPE_UNKNOWN;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline bool unwind_error(struct unwind_state *state)
|
||
|
|
{
|
||
|
|
return state->error;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define GRAPH_FAKE_OFFSET (sizeof(struct pt_regs) - offsetof(struct pt_regs, regs[1]))
|
||
|
|
|
||
|
|
static inline unsigned long unwind_graph_addr(struct unwind_state *state,
|
||
|
|
unsigned long pc, unsigned long cfa)
|
||
|
|
{
|
||
|
|
return ftrace_graph_ret_addr(state->task, &state->graph_idx,
|
||
|
|
pc, (unsigned long *)(cfa - GRAPH_FAKE_OFFSET));
|
||
|
|
}
|
||
|
|
|
||
|
|
static __always_inline void __unwind_start(struct unwind_state *state,
|
||
|
|
struct task_struct *task, struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
memset(state, 0, sizeof(*state));
|
||
|
|
if (regs) {
|
||
|
|
state->sp = regs->regs[3];
|
||
|
|
state->pc = regs->csr_era;
|
||
|
|
state->ra = regs->regs[1];
|
||
|
|
state->fp = regs->regs[22];
|
||
|
|
} else if (task && task != current) {
|
||
|
|
state->sp = thread_saved_fp(task);
|
||
|
|
state->pc = thread_saved_ra(task);
|
||
|
|
state->ra = 0;
|
||
|
|
state->fp = 0;
|
||
|
|
} else {
|
||
|
|
state->sp = (unsigned long)__builtin_frame_address(0);
|
||
|
|
state->pc = (unsigned long)__builtin_return_address(0);
|
||
|
|
state->ra = 0;
|
||
|
|
state->fp = 0;
|
||
|
|
}
|
||
|
|
state->task = task;
|
||
|
|
get_stack_info(state->sp, state->task, &state->stack_info);
|
||
|
|
state->pc = unwind_graph_addr(state, state->pc, state->sp);
|
||
|
|
}
|
||
|
|
|
||
|
|
static __always_inline unsigned long __unwind_get_return_address(struct unwind_state *state)
|
||
|
|
{
|
||
|
|
if (unwind_done(state))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return __kernel_text_address(state->pc) ? state->pc : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_UNWINDER_ORC
|
||
|
|
void unwind_init(void);
|
||
|
|
void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size);
|
||
|
|
#else
|
||
|
|
static inline void unwind_init(void) {}
|
||
|
|
static inline void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size, void *orc, size_t orc_size) {}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* _ASM_UNWIND_H */
|