197 lines
5.4 KiB
C
197 lines
5.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_PTRACE_H
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#define _ASM_PTRACE_H
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#include <asm/page.h>
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#include <asm/irqflags.h>
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#include <asm/thread_info.h>
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#include <uapi/asm/ptrace.h>
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/*
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* This struct defines the way the registers are stored on the stack during
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* a system call/exception. If you add a register here, please also add it to
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* regoffset_table[] in arch/loongarch/kernel/ptrace.c.
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*/
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struct pt_regs {
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/* Main processor registers. */
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unsigned long regs[32];
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/* Original syscall arg0. */
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unsigned long orig_a0;
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/* Special CSR registers. */
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unsigned long csr_era;
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unsigned long csr_badvaddr;
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unsigned long csr_crmd;
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unsigned long csr_prmd;
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unsigned long csr_euen;
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unsigned long csr_ecfg;
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unsigned long csr_estat;
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unsigned long __last[];
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} __aligned(8);
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static inline int regs_irqs_disabled(struct pt_regs *regs)
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{
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return arch_irqs_disabled_flags(regs->csr_prmd);
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}
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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->regs[3];
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}
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/*
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* Don't use asm-generic/ptrace.h it defines FP accessors that don't make
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* sense on LoongArch. We rather want an error if they get invoked.
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*/
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static inline void instruction_pointer_set(struct pt_regs *regs, unsigned long val)
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{
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regs->csr_era = val;
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}
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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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#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
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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, 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, 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, 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 task_struct;
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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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* Note that this chooses most probably assignment, in some case
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* it can be incorrect.
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* This is expected to be called from kprobes or ftrace with regs
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* where the top of stack is the return address.
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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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#define NR_REG_ARGUMENTS 8
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static const unsigned int args[] = {
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offsetof(struct pt_regs, regs[4]),
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offsetof(struct pt_regs, regs[5]),
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offsetof(struct pt_regs, regs[6]),
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offsetof(struct pt_regs, regs[7]),
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offsetof(struct pt_regs, regs[8]),
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offsetof(struct pt_regs, regs[9]),
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offsetof(struct pt_regs, regs[10]),
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offsetof(struct pt_regs, regs[11]),
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};
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if (n < NR_REG_ARGUMENTS)
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return regs_get_register(regs, args[n]);
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else {
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n -= NR_REG_ARGUMENTS;
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return regs_get_kernel_stack_nth(regs, n);
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}
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}
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/*
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* Does the process account for user or for system time?
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*/
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#define user_mode(regs) (((regs)->csr_prmd & PLV_MASK) == PLV_USER)
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static inline long regs_return_value(struct pt_regs *regs)
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{
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return regs->regs[4];
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}
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static inline void regs_set_return_value(struct pt_regs *regs, unsigned long val)
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{
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regs->regs[4] = val;
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}
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#define instruction_pointer(regs) ((regs)->csr_era)
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#define profile_pc(regs) instruction_pointer(regs)
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extern void die(const char *str, struct pt_regs *regs);
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static inline void die_if_kernel(const char *str, struct pt_regs *regs)
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{
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if (unlikely(!user_mode(regs)))
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die(str, regs);
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}
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#define current_pt_regs() \
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({ \
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unsigned long sp = (unsigned long)__builtin_frame_address(0); \
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(struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1) - 1; \
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})
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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->regs[3];
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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[3] = val;
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}
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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#define arch_has_single_step() (1)
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#endif
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#endif /* _ASM_PTRACE_H */
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