151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_FTRACE_H
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#define _ASM_X86_FTRACE_H
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#ifdef CONFIG_FUNCTION_TRACER
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#ifndef CC_USING_FENTRY
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# error Compiler does not support fentry?
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#endif
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# define MCOUNT_ADDR ((unsigned long)(__fentry__))
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#define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */
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/* Ignore unused weak functions which will have non zero offsets */
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#ifdef CONFIG_HAVE_FENTRY
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# include <asm/ibt.h>
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/* Add offset for endbr64 if IBT enabled */
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# define FTRACE_MCOUNT_MAX_OFFSET ENDBR_INSN_SIZE
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#endif
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#ifdef CONFIG_DYNAMIC_FTRACE
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#define ARCH_SUPPORTS_FTRACE_OPS 1
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#endif
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#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
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#ifndef __ASSEMBLY__
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extern void __fentry__(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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* 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_HAVE_DYNAMIC_FTRACE_WITH_ARGS
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struct ftrace_regs {
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struct pt_regs regs;
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};
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static __always_inline struct pt_regs *
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arch_ftrace_get_regs(struct ftrace_regs *fregs)
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{
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/* Only when FL_SAVE_REGS is set, cs will be non zero */
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if (!fregs->regs.cs)
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return NULL;
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return &fregs->regs;
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}
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#define ftrace_regs_set_instruction_pointer(fregs, _ip) \
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do { (fregs)->regs.ip = (_ip); } while (0)
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#define ftrace_regs_get_instruction_pointer(fregs) \
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((fregs)->regs.ip)
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#define ftrace_regs_get_argument(fregs, n) \
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regs_get_kernel_argument(&(fregs)->regs, n)
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#define ftrace_regs_get_stack_pointer(fregs) \
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kernel_stack_pointer(&(fregs)->regs)
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#define ftrace_regs_return_value(fregs) \
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regs_return_value(&(fregs)->regs)
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#define ftrace_regs_set_return_value(fregs, ret) \
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regs_set_return_value(&(fregs)->regs, ret)
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#define ftrace_override_function_with_return(fregs) \
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override_function_with_return(&(fregs)->regs)
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#define ftrace_regs_query_register_offset(name) \
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regs_query_register_offset(name)
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struct ftrace_ops;
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#define ftrace_graph_func ftrace_graph_func
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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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#else
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#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
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#endif
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#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
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/*
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* When a ftrace registered caller is tracing a function that is
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* also set by a register_ftrace_direct() call, it needs to be
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* differentiated in the ftrace_caller trampoline. To do this, we
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* place the direct caller in the ORIG_AX part of pt_regs. This
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* tells the ftrace_caller that there's a direct caller.
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*/
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static inline void
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__arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr)
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{
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/* Emulate a call */
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regs->orig_ax = addr;
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}
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#define arch_ftrace_set_direct_caller(fregs, addr) \
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__arch_ftrace_set_direct_caller(&(fregs)->regs, addr)
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#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
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#ifdef CONFIG_DYNAMIC_FTRACE
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struct dyn_arch_ftrace {
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/* No extra data needed for x86 */
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};
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_FUNCTION_TRACER */
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
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extern void set_ftrace_ops_ro(void);
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#else
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static inline void set_ftrace_ops_ro(void) { }
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#endif
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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, const char *name)
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{
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/*
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* Compare the symbol name with the system call name. Skip the
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* "__x64_sys", "__ia32_sys", "__do_sys" or simple "sys" prefix.
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*/
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return !strcmp(sym + 3, name + 3) ||
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(!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) ||
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(!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3)) ||
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(!strncmp(sym, "__do_sys", 8) && !strcmp(sym + 8, name + 3));
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}
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#ifndef COMPILE_OFFSETS
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#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION)
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#include <linux/compat.h>
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/*
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* Because ia32 syscalls do not map to x86_64 syscall numbers
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* this screws up the trace output when tracing a ia32 task.
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* Instead of reporting bogus syscalls, just do not trace them.
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*
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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 1
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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 in_32bit_syscall();
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}
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#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */
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#endif /* !COMPILE_OFFSETS */
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_FTRACE_H */
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