1 /* Gprof -c option support for AArch64.
2    Copyright 2013 Linaro Ltd.
3 
4    Based upon gprof/i386.c.
5 
6    Copyright (c) 1983, 1993, 2001
7    The Regents of the University of California.  All rights reserved.
8 
9    Redistribution and use in source and binary forms, with or without
10    modification, are permitted provided that the following conditions
11    are met:
12 
13    1.  Redistributions of source code must retain the above copyright
14        notice, this list of conditions and the following disclaimer.
15    2.  Redistributions in binary form must reproduce the above copyright
16        notice, this list of conditions and the following disclaimer in the
17        documentation and/or other materials provided with the distribution.
18    3.  Neither the name of the University nor the names of its contributors
19        may be used to endorse or promote products derived from this software
20        without specific prior written permission.
21 
22    THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25    ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32    SUCH DAMAGE.  */
33 
34 #include "gprof.h"
35 #include "search_list.h"
36 #include "source.h"
37 #include "symtab.h"
38 #include "cg_arcs.h"
39 #include "corefile.h"
40 #include "hist.h"
41 
42 #define BRANCH_MASK    0x7c000000
43 #define BRANCH_PATTERN 0x14000000
44 
45 void aarch64_find_call (Sym *, bfd_vma, bfd_vma);
46 
47 void
48 aarch64_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)
49 {
50   bfd_vma pc, dest_pc, offset;
51   unsigned int insn;
52   Sym *child;
53 
54   DBG (CALLDEBUG, printf ("[find_call] %s: 0x%lx to 0x%lx\n",
55 			  parent->name, (unsigned long) p_lowpc,
56 			  (unsigned long) p_highpc));
57 
58   for (pc = p_lowpc; pc < p_highpc; pc += 4)
59     {
60 
61       insn = bfd_get_32 (core_bfd, ((unsigned char *) core_text_space
62 				    + pc - core_text_sect->vma));
63 
64       if ((insn & BRANCH_MASK) == BRANCH_PATTERN)
65 	{
66 	  DBG (CALLDEBUG,
67 	       printf ("[find_call] 0x%lx: bl", (unsigned long) pc));
68 
69 	  /* Regular pc relative addressing check that this is the
70 	     address of a function.  */
71 	  offset = ((((bfd_vma) insn & 0x3ffffff) ^ 0x2000000) - 0x2000000) << 2;
72 
73 	  dest_pc = pc + offset;
74 
75 	  if (hist_check_address (dest_pc))
76 	    {
77 	      child = sym_lookup (&symtab, dest_pc);
78 
79 	      if (child)
80 		{
81 		  DBG (CALLDEBUG,
82 		       printf ("\tdest_pc=0x%lx, (name=%s, addr=0x%lx)\n",
83 			       (unsigned long) dest_pc, child->name,
84 			       (unsigned long) child->addr));
85 
86 		  if (child->addr == dest_pc)
87 		    {
88 		      /* a hit.  */
89 		      arc_add (parent, child, (unsigned long) 0);
90 		      continue;
91 		    }
92 		}
93 	    }
94 
95 	  /* Something funny going on.  */
96 	  DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
97 	}
98     }
99 }
100