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Linux/arch/parisc/kernel/ftrace.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Code for tracing calls in Linux kernel.
  4  * Copyright (C) 2009-2016 Helge Deller <deller@gmx.de>
  5  *
  6  * based on code for x86 which is:
  7  * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
  8  *
  9  * future possible enhancements:
 10  *      - add CONFIG_DYNAMIC_FTRACE
 11  *      - add CONFIG_STACK_TRACER
 12  */
 13 
 14 #include <linux/init.h>
 15 #include <linux/ftrace.h>
 16 
 17 #include <asm/assembly.h>
 18 #include <asm/sections.h>
 19 #include <asm/ftrace.h>
 20 
 21 
 22 #define __hot __attribute__ ((__section__ (".text.hot")))
 23 
 24 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 25 /*
 26  * Hook the return address and push it in the stack of return addrs
 27  * in current thread info.
 28  */
 29 static void __hot prepare_ftrace_return(unsigned long *parent,
 30                                         unsigned long self_addr)
 31 {
 32         unsigned long old;
 33         struct ftrace_graph_ent trace;
 34         extern int parisc_return_to_handler;
 35 
 36         if (unlikely(ftrace_graph_is_dead()))
 37                 return;
 38 
 39         if (unlikely(atomic_read(&current->tracing_graph_pause)))
 40                 return;
 41 
 42         old = *parent;
 43 
 44         trace.func = self_addr;
 45         trace.depth = current->curr_ret_stack + 1;
 46 
 47         /* Only trace if the calling function expects to */
 48         if (!ftrace_graph_entry(&trace))
 49                 return;
 50 
 51         if (ftrace_push_return_trace(old, self_addr, &trace.depth,
 52                                      0, NULL) == -EBUSY)
 53                 return;
 54 
 55         /* activate parisc_return_to_handler() as return point */
 56         *parent = (unsigned long) &parisc_return_to_handler;
 57 }
 58 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 59 
 60 void notrace __hot ftrace_function_trampoline(unsigned long parent,
 61                                 unsigned long self_addr,
 62                                 unsigned long org_sp_gr3)
 63 {
 64         extern ftrace_func_t ftrace_trace_function;  /* depends on CONFIG_DYNAMIC_FTRACE */
 65         extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace);
 66 
 67         if (ftrace_trace_function != ftrace_stub) {
 68                 /* struct ftrace_ops *op, struct pt_regs *regs); */
 69                 ftrace_trace_function(parent, self_addr, NULL, NULL);
 70                 return;
 71         }
 72 
 73 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 74         if (ftrace_graph_return != (trace_func_graph_ret_t) ftrace_stub ||
 75                 ftrace_graph_entry != ftrace_graph_entry_stub) {
 76                 unsigned long *parent_rp;
 77 
 78                 /* calculate pointer to %rp in stack */
 79                 parent_rp = (unsigned long *) (org_sp_gr3 - RP_OFFSET);
 80                 /* sanity check: parent_rp should hold parent */
 81                 if (*parent_rp != parent)
 82                         return;
 83 
 84                 prepare_ftrace_return(parent_rp, self_addr);
 85                 return;
 86         }
 87 #endif
 88 }
 89 
 90 

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