1 /*
2 * Copyright (c) 1983, 1993, 1998
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29 #include "gprof.h"
30 #include "search_list.h"
31 #include "source.h"
32 #include "symtab.h"
33 #include "cg_arcs.h"
34 #include "corefile.h"
35 #include "hist.h"
36
37 /*
38 * Opcodes of the call instructions:
39 */
40 #define OP_Jxx 0x1aU
41 #define OP_BSR 0x34U
42
43 #define Jxx_FUNC_JMP 0U
44 #define Jxx_FUNC_JSR 1U
45 #define Jxx_FUNC_RET 2U
46 #define Jxx_FUNC_JSR_COROUTINE 3U
47
48 /* *INDENT-OFF* */
49 /* Here to document only. We can't use this when cross compiling as
50 the bitfield layout might not be the same as native.
51
52 typedef union
53 {
54 struct
55 {
56 unsigned other:26;
57 unsigned op_code:6;
58 }
59 a; -- any format
60 struct
61 {
62 int disp:21;
63 unsigned ra:5;
64 unsigned op_code:6;
65 }
66 b; -- branch format
67 struct
68 {
69 int hint:14;
70 unsigned func:2;
71 unsigned rb:5;
72 unsigned ra:5;
73 unsigned op_code:6;
74 }
75 j; -- jump format
76 }
77 alpha_Instruction;
78 */
79 /* *INDENT-ON* */
80
81 static Sym indirect_child;
82
83 void alpha_find_call (Sym *, bfd_vma, bfd_vma);
84
85 /*
86 * On the Alpha we can only detect PC relative calls, which are
87 * usually generated for calls to functions within the same
88 * object file only. This is still better than nothing, however.
89 * (In particular it should be possible to find functions that
90 * potentially call integer division routines, for example.)
91 */
92 void
93 alpha_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)
94 {
95 bfd_vma pc, dest_pc;
96 unsigned int insn;
97 Sym *child;
98
99 if (indirect_child.name == NULL)
100 {
101 sym_init (&indirect_child);
102 indirect_child.name = _("<indirect child>");
103 indirect_child.cg.prop.fract = 1.0;
104 indirect_child.cg.cyc.head = &indirect_child;
105 }
106
107 DBG (CALLDEBUG, printf (_("[find_call] %s: 0x%lx to 0x%lx\n"),
108 parent->name, (unsigned long) p_lowpc,
109 (unsigned long) p_highpc));
110 for (pc = (p_lowpc + 3) & ~(bfd_vma) 3; pc < p_highpc; pc += 4)
111 {
112 insn = bfd_get_32 (core_bfd, ((unsigned char *) core_text_space
113 + pc - core_text_sect->vma));
114 switch (insn & (0x3fU << 26))
115 {
116 case OP_Jxx << 26:
117 /*
118 * There is no simple and reliable way to determine the
119 * target of a jsr (the hint bits help, but there aren't
120 * enough bits to get a satisfactory hit rate). Instead,
121 * for any indirect jump we simply add an arc from PARENT
122 * to INDIRECT_CHILD---that way the user it at least able
123 * to see that there are other calls as well.
124 */
125 if ((insn & (3 << 14)) == Jxx_FUNC_JSR << 14
126 || (insn & (3 << 14)) == Jxx_FUNC_JSR_COROUTINE << 14)
127 {
128 DBG (CALLDEBUG,
129 printf (_("[find_call] 0x%lx: jsr%s <indirect_child>\n"),
130 (unsigned long) pc,
131 ((insn & (3 << 14)) == Jxx_FUNC_JSR << 14
132 ? "" : "_coroutine")));
133 arc_add (parent, &indirect_child, (unsigned long) 0);
134 }
135 break;
136
137 case OP_BSR << 26:
138 DBG (CALLDEBUG,
139 printf (_("[find_call] 0x%lx: bsr"), (unsigned long) pc));
140 /*
141 * Regular PC relative addressing. Check that this is the
142 * address of a function. The linker sometimes redirects
143 * the entry point by 8 bytes to skip loading the global
144 * pointer, so we allow for either address:
145 */
146 dest_pc = pc + 4 + (((bfd_signed_vma) (insn & 0x1fffff)
147 ^ 0x100000) - 0x100000);
148 if (hist_check_address (dest_pc))
149 {
150 child = sym_lookup (&symtab, dest_pc);
151 if (child)
152 {
153 DBG (CALLDEBUG,
154 printf (" 0x%lx\t; name=%s, addr=0x%lx",
155 (unsigned long) dest_pc, child->name,
156 (unsigned long) child->addr));
157 if (child->addr == dest_pc || child->addr == dest_pc - 8)
158 {
159 DBG (CALLDEBUG, printf ("\n"));
160 /* a hit: */
161 arc_add (parent, child, (unsigned long) 0);
162 continue;
163 }
164 }
165 }
166 /*
167 * Something funny going on.
168 */
169 DBG (CALLDEBUG, printf ("\tbut it's a botch\n"));
170 break;
171
172 default:
173 break;
174 }
175 }
176 }