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045bd00f3e
Doing the indirection through macros for the regs accessors just makes them harder to read, so implement the helpers directly. Note that only the helpers actually used are implemented now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
139 lines
3.7 KiB
C
139 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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