140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 1999, 2000 Niibe Yutaka
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*/
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#ifndef __ASM_SH_PTRACE_H
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#define __ASM_SH_PTRACE_H
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#include <linux/stringify.h>
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#include <linux/stddef.h>
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#include <linux/thread_info.h>
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#include <asm/addrspace.h>
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#include <asm/page.h>
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#include <uapi/asm/ptrace.h>
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#define user_mode(regs) (((regs)->sr & 0x40000000)==0)
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#define kernel_stack_pointer(_regs) ((unsigned long)(_regs)->regs[15])
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static inline unsigned long instruction_pointer(struct pt_regs *regs)
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{
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return regs->pc;
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}
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static inline void instruction_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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regs->pc = val;
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}
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static inline unsigned long frame_pointer(struct pt_regs *regs)
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{
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return regs->regs[14];
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}
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static inline unsigned long user_stack_pointer(struct pt_regs *regs)
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{
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return regs->regs[15];
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}
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static inline void user_stack_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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regs->regs[15] = val;
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}
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#define arch_has_single_step() (1)
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/*
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* kprobe-based event tracer support
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*/
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struct pt_regs_offset {
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const char *name;
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int offset;
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};
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#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
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#define REGS_OFFSET_NAME(num) \
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{.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])}
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#define TREGS_OFFSET_NAME(num) \
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{.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])}
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#define REG_OFFSET_END {.name = NULL, .offset = 0}
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/* Query offset/name of register from its name/offset */
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extern int regs_query_register_offset(const char *name);
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extern const char *regs_query_register_name(unsigned int offset);
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extern const struct pt_regs_offset regoffset_table[];
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/**
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* regs_get_register() - get register value from its offset
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* @regs: pt_regs from which register value is gotten.
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* @offset: offset number of the register.
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*
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* regs_get_register returns the value of a register. The @offset is the
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* offset of the register in struct pt_regs address which specified by @regs.
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* If @offset is bigger than MAX_REG_OFFSET, this returns 0.
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*/
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static inline unsigned long regs_get_register(struct pt_regs *regs,
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unsigned int offset)
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{
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if (unlikely(offset > MAX_REG_OFFSET))
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return 0;
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return *(unsigned long *)((unsigned long)regs + offset);
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}
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/**
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* regs_within_kernel_stack() - check the address in the stack
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* @regs: pt_regs which contains kernel stack pointer.
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* @addr: address which is checked.
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*
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* regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
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* If @addr is within the kernel stack, it returns true. If not, returns false.
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*/
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static inline int regs_within_kernel_stack(struct pt_regs *regs,
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unsigned long addr)
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{
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return ((addr & ~(THREAD_SIZE - 1)) ==
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(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
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}
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/**
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* regs_get_kernel_stack_nth() - get Nth entry of the stack
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* @regs: pt_regs which contains kernel stack pointer.
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* @n: stack entry number.
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*
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* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
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* is specified by @regs. If the @n th entry is NOT in the kernel stack,
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* this returns 0.
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*/
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static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
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unsigned int n)
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{
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unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
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addr += n;
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if (regs_within_kernel_stack(regs, (unsigned long)addr))
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return *addr;
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else
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return 0;
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}
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struct perf_event;
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struct perf_sample_data;
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extern void ptrace_triggered(struct perf_event *bp,
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struct perf_sample_data *data, struct pt_regs *regs);
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#define task_pt_regs(task) \
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((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE) - 1)
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static inline unsigned long profile_pc(struct pt_regs *regs)
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{
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unsigned long pc = regs->pc;
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if (virt_addr_uncached(pc))
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return CAC_ADDR(pc);
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return pc;
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}
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#endif /* __ASM_SH_PTRACE_H */
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