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This patch implements ftrace trampolines through plt entry. Tested by forcing ftrace_make_call() to use the module PLT, and then loading up a module after setting up ftrace with: | echo ":mod:<module-name>" > set_ftrace_filter; | echo function > current_tracer; | modprobe <module-name> Since FTRACE_ADDR/FTRACE_REGS_ADDR is only defined when CONFIG_DYNAMIC_ FTRACE is selected, we wrap their usage in module_init_ftrace_plt() with ifdeffery rather than using IS_ENABLED(). Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_LOONGARCH_FTRACE_H
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#define _ASM_LOONGARCH_FTRACE_H
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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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#define GRAPH_FAKE_OFFSET (sizeof(struct pt_regs) - offsetof(struct pt_regs, regs[1]))
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#ifdef CONFIG_FUNCTION_TRACER
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#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
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#ifndef __ASSEMBLY__
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#ifndef CONFIG_DYNAMIC_FTRACE
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#define mcount _mcount
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extern void _mcount(void);
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extern void prepare_ftrace_return(unsigned long self_addr, unsigned long callsite_sp, unsigned long old);
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#else
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struct dyn_ftrace;
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struct dyn_arch_ftrace { };
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#define ARCH_SUPPORTS_FTRACE_OPS 1
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#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
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#define ftrace_init_nop ftrace_init_nop
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int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
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static inline unsigned long ftrace_call_adjust(unsigned long addr)
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{
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return addr;
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}
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void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent);
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
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struct ftrace_ops;
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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 *arch_ftrace_get_regs(struct ftrace_regs *fregs)
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{
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return &fregs->regs;
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}
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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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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_FUNCTION_TRACER */
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#endif /* _ASM_LOONGARCH_FTRACE_H */
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