| 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 | } |