178 lines
4.2 KiB
C
178 lines
4.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Regents of the University of California
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*/
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#ifndef _ASM_RISCV_PTRACE_H
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#define _ASM_RISCV_PTRACE_H
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#include <uapi/asm/ptrace.h>
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#include <asm/csr.h>
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#include <linux/compiler.h>
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#ifndef __ASSEMBLY__
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struct pt_regs {
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unsigned long epc;
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unsigned long ra;
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unsigned long sp;
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unsigned long gp;
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unsigned long tp;
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unsigned long t0;
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unsigned long t1;
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unsigned long t2;
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unsigned long s0;
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unsigned long s1;
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unsigned long a0;
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unsigned long a1;
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unsigned long a2;
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unsigned long a3;
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unsigned long a4;
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unsigned long a5;
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unsigned long a6;
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unsigned long a7;
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unsigned long s2;
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unsigned long s3;
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unsigned long s4;
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unsigned long s5;
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unsigned long s6;
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unsigned long s7;
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unsigned long s8;
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unsigned long s9;
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unsigned long s10;
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unsigned long s11;
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unsigned long t3;
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unsigned long t4;
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unsigned long t5;
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unsigned long t6;
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/* Supervisor/Machine CSRs */
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unsigned long status;
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unsigned long badaddr;
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unsigned long cause;
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/* a0 value before the syscall */
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unsigned long orig_a0;
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};
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#ifdef CONFIG_64BIT
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#define REG_FMT "%016lx"
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#else
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#define REG_FMT "%08lx"
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#endif
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#define user_mode(regs) (((regs)->status & SR_PP) == 0)
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#define MAX_REG_OFFSET offsetof(struct pt_regs, orig_a0)
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/* Helpers for working with the instruction pointer */
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static inline unsigned long instruction_pointer(struct pt_regs *regs)
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{
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return regs->epc;
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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->epc = val;
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}
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#define profile_pc(regs) instruction_pointer(regs)
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/* Helpers for working with the user stack pointer */
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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->sp;
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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->sp = val;
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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->sp;
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}
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/* Helpers for working with the frame pointer */
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static inline unsigned long frame_pointer(struct pt_regs *regs)
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{
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return regs->s0;
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}
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static inline void frame_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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regs->s0 = val;
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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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static inline void regs_set_return_value(struct pt_regs *regs,
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unsigned long val)
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{
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regs->a0 = val;
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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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void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
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unsigned long frame_pointer);
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int do_syscall_trace_enter(struct pt_regs *regs);
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void do_syscall_trace_exit(struct pt_regs *regs);
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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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/**
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* regs_get_kernel_argument() - get Nth function argument in kernel
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* @regs: pt_regs of that context
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* @n: function argument number (start from 0)
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*
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* regs_get_argument() returns @n th argument of the function call.
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*
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* Note you can get the parameter correctly if the function has no
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* more than eight arguments.
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*/
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static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
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unsigned int n)
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{
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static const int nr_reg_arguments = 8;
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static const unsigned int argument_offs[] = {
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offsetof(struct pt_regs, a0),
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offsetof(struct pt_regs, a1),
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offsetof(struct pt_regs, a2),
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offsetof(struct pt_regs, a3),
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offsetof(struct pt_regs, a4),
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offsetof(struct pt_regs, a5),
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offsetof(struct pt_regs, a6),
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offsetof(struct pt_regs, a7),
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};
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if (n < nr_reg_arguments)
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return regs_get_register(regs, argument_offs[n]);
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return 0;
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}
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_RISCV_PTRACE_H */
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