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