/* 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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#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
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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 FTRACE_REGS_PLT_IDX 1
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#define NR_FTRACE_PLTS 2
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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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static inline unsigned long ftrace_call_adjust(unsigned long addr)
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{
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/*
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* Adjust addr to point at the BL in the callsite.
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* See ftrace_init_nop() for the callsite sequence.
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*/
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if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS))
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return addr + AARCH64_INSN_SIZE;
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/*
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* addr is the address of the mcount call instruction.
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* recordmcount does the necessary offset calculation.
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*/
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return addr;
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}
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#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
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struct dyn_ftrace;
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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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#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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