174 lines
4.3 KiB
C
174 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* arch/arm64/include/asm/ftrace.h
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*
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* Copyright (C) 2013 Linaro Limited
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* Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
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*/
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#ifndef __ASM_FTRACE_H
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#define __ASM_FTRACE_H
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#include <asm/insn.h>
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#define HAVE_FUNCTION_GRAPH_FP_TEST
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/*
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* HAVE_FUNCTION_GRAPH_RET_ADDR_PTR means that the architecture can provide a
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* "return address pointer" which can be used to uniquely identify a return
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* address which has been overwritten.
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*
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* On arm64 we use the address of the caller's frame record, which remains the
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* same for the lifetime of the instrumented function, unlike the return
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* address in the LR.
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*/
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#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
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#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
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#define ARCH_SUPPORTS_FTRACE_OPS 1
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#else
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#define MCOUNT_ADDR ((unsigned long)_mcount)
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#endif
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/* The BL at the callsite's adjusted rec->ip */
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#define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE
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#define FTRACE_PLT_IDX 0
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#define NR_FTRACE_PLTS 1
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/*
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* Currently, gcc tends to save the link register after the local variables
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* on the stack. This causes the max stack tracer to report the function
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* frame sizes for the wrong functions. By defining
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* ARCH_FTRACE_SHIFT_STACK_TRACER, it will tell the stack tracer to expect
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* to find the return address on the stack after the local variables have
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* been set up.
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*
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* Note, this may change in the future, and we will need to deal with that
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* if it were to happen.
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*/
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#define ARCH_FTRACE_SHIFT_STACK_TRACER 1
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#ifndef __ASSEMBLY__
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#include <linux/compat.h>
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extern void _mcount(unsigned long);
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extern void *return_address(unsigned int);
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struct dyn_arch_ftrace {
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/* No extra data needed for arm64 */
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};
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extern unsigned long ftrace_graph_call;
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extern void return_to_handler(void);
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unsigned long ftrace_call_adjust(unsigned long addr);
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#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
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struct dyn_ftrace;
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struct ftrace_ops;
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#define arch_ftrace_get_regs(regs) NULL
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struct ftrace_regs {
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/* x0 - x8 */
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unsigned long regs[9];
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unsigned long __unused;
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unsigned long fp;
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unsigned long lr;
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unsigned long sp;
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unsigned long pc;
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};
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static __always_inline unsigned long
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ftrace_regs_get_instruction_pointer(const struct ftrace_regs *fregs)
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{
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return fregs->pc;
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}
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static __always_inline void
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ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
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unsigned long pc)
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{
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fregs->pc = pc;
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}
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static __always_inline unsigned long
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ftrace_regs_get_stack_pointer(const struct ftrace_regs *fregs)
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{
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return fregs->sp;
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}
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static __always_inline unsigned long
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ftrace_regs_get_argument(struct ftrace_regs *fregs, unsigned int n)
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{
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if (n < 8)
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return fregs->regs[n];
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return 0;
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}
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static __always_inline unsigned long
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ftrace_regs_get_return_value(const struct ftrace_regs *fregs)
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{
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return fregs->regs[0];
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}
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static __always_inline void
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ftrace_regs_set_return_value(struct ftrace_regs *fregs,
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unsigned long ret)
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{
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fregs->regs[0] = ret;
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}
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static __always_inline void
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ftrace_override_function_with_return(struct ftrace_regs *fregs)
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{
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fregs->pc = fregs->lr;
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}
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int ftrace_regs_query_register_offset(const char *name);
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int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
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#define ftrace_init_nop ftrace_init_nop
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void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
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struct ftrace_ops *op, struct ftrace_regs *fregs);
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#define ftrace_graph_func ftrace_graph_func
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#endif
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#define ftrace_return_address(n) return_address(n)
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/*
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* Because AArch32 mode does not share the same syscall table with AArch64,
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* tracing compat syscalls may result in reporting bogus syscalls or even
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* hang-up, so just do not trace them.
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* See kernel/trace/trace_syscalls.c
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*
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* x86 code says:
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* If the user really wants these, then they should use the
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* raw syscall tracepoints with filtering.
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*/
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#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
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static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
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{
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return is_compat_task();
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}
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#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
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static inline bool arch_syscall_match_sym_name(const char *sym,
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const char *name)
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{
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/*
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* Since all syscall functions have __arm64_ prefix, we must skip it.
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* However, as we described above, we decided to ignore compat
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* syscalls, so we don't care about __arm64_compat_ prefix here.
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*/
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return !strcmp(sym + 8, name);
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}
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#endif /* ifndef __ASSEMBLY__ */
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#endif /* __ASM_FTRACE_H */
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