33e53ae1ce
This patch enable kprobes, kretprobes, ftrace interface. It utilized software breakpoint and single step debug exceptions, instructions simulation on csky. We use USR_BKPT replace origin instruction, and the kprobe handler prepares an excutable memory slot for out-of-line execution with a copy of the original instruction being probed. Most of instructions could be executed by single-step, but some instructions need origin pc value to execute and we need software simulate these instructions. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_PTRACE_H
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#define __ASM_CSKY_PTRACE_H
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#include <uapi/asm/ptrace.h>
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#include <asm/traps.h>
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#include <linux/types.h>
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#include <linux/compiler.h>
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#ifndef __ASSEMBLY__
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#define PS_S 0x80000000 /* Supervisor Mode */
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#define USR_BKPT 0x1464
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#define arch_has_single_step() (1)
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#define current_pt_regs() \
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({ (struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1; })
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#define user_stack_pointer(regs) ((regs)->usp)
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#define user_mode(regs) (!((regs)->sr & PS_S))
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#define instruction_pointer(regs) ((regs)->pc)
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#define profile_pc(regs) instruction_pointer(regs)
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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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#if defined(__CSKYABIV2__)
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#define MAX_REG_OFFSET offsetof(struct pt_regs, dcsr)
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#else
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#define MAX_REG_OFFSET offsetof(struct pt_regs, regs[9])
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#endif
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static inline bool in_syscall(struct pt_regs const *regs)
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{
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return ((regs->sr >> 16) & 0xff) == VEC_TRAP0;
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}
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static inline void forget_syscall(struct pt_regs *regs)
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{
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regs->sr &= ~(0xff << 16);
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}
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static inline unsigned long regs_return_value(struct pt_regs *regs)
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{
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return regs->a0;
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}
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/* Valid only for Kernel mode traps. */
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static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
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{
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return regs->usp;
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}
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extern int regs_query_register_offset(const char *name);
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extern 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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* 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 of the register.
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*
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* regs_get_register returns the value of a register whose offset from @regs.
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* The @offset is the offset of the register in struct pt_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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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_CSKY_PTRACE_H */
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