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28bb030f93
Support dynamic ftrace including dynamic graph tracer. Gcc-csky with -pg will produce call site in every function prologue and we can use these call site to hook trace function. gcc with -pg origin call site: push lr jbsr _mcount nop32 nop32 If the (callee - caller)'s offset is in range of bsr instruction, we'll modify code with: push lr bsr _mcount nop32 nop32 Else if the (callee - caller)'s offset is out of bsr instrunction, we'll modify code with: push lr movih r26, ... ori r26, ... jsr r26 (r26 is reserved for jsr link reg in csky abiv2 spec.) Signed-off-by: Guo Ren <ren_guo@c-sky.com>
29 lines
581 B
C
29 lines
581 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_FTRACE_H
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#define __ASM_CSKY_FTRACE_H
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#define MCOUNT_INSN_SIZE 14
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#define HAVE_FUNCTION_GRAPH_FP_TEST
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#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
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#define MCOUNT_ADDR ((unsigned long)_mcount)
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#ifndef __ASSEMBLY__
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extern void _mcount(unsigned long);
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extern void ftrace_graph_call(void);
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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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struct dyn_arch_ftrace {
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};
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_CSKY_FTRACE_H */
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