arch.h revision 7e26bd32a1a2269c193a6ef100ed8cd3127f3dc2 
1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2012 Petr Machata
4 * Copyright (C) 2006 Paul Gilliam
5 * Copyright (C) 2002,2004 Juan Cespedes
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22#ifndef LTRACE_PPC_ARCH_H
23#define LTRACE_PPC_ARCH_H
24
25#include <gelf.h>
26
27#define BREAKPOINT_VALUE { 0x7f, 0xe0, 0x00, 0x08 }
28#define BREAKPOINT_LENGTH 4
29#define DECR_PC_AFTER_BREAK 0
30
31#define LT_ELFCLASS	ELFCLASS32
32#define LT_ELF_MACHINE	EM_PPC
33
34#ifdef __powerpc64__ // Says 'ltrace' is 64 bits, says nothing about target.
35#define LT_ELFCLASS2	ELFCLASS64
36#define LT_ELF_MACHINE2	EM_PPC64
37#define ARCH_SUPPORTS_OPD
38#endif
39
40#define ARCH_HAVE_ATOMIC_SINGLESTEP
41#define ARCH_HAVE_ADD_PLT_ENTRY
42#define ARCH_HAVE_TRANSLATE_ADDRESS
43#define ARCH_HAVE_DYNLINK_DONE
44#define ARCH_HAVE_FETCH_ARG
45#define ARCH_ENDIAN_BIG
46#define ARCH_HAVE_SIZEOF
47#define ARCH_HAVE_ALIGNOF
48
49struct library_symbol;
50
51#define ARCH_HAVE_LTELF_DATA
52struct arch_ltelf_data {
53	GElf_Addr plt_stub_vma;
54	struct library_symbol *stubs;
55	Elf_Data *opd_data;
56	GElf_Addr opd_base;
57	GElf_Xword opd_size;
58	int secure_plt;
59};
60
61#define ARCH_HAVE_LIBRARY_DATA
62struct arch_library_data {
63	GElf_Addr pltgot_addr;
64	int bss_plt_prelinked;
65};
66
67enum ppc64_plt_type {
68	/* Either a non-PLT symbol, or PPC32 symbol.  */
69	PPC_DEFAULT = 0,
70
71	/* PPC64 STUB, never resolved.  */
72	PPC64_PLT_STUB,
73
74	/* Unresolved PLT symbol (.plt contains PLT address).  */
75	PPC_PLT_UNRESOLVED,
76
77	/* Resolved PLT symbol.  The corresponding .plt slot contained
78	 * target address, which was changed to the address of
79	 * corresponding PLT entry.  The original is now saved in
80	 * RESOLVED_VALUE.  */
81	PPC_PLT_RESOLVED,
82};
83
84#define ARCH_HAVE_LIBRARY_SYMBOL_DATA
85struct arch_library_symbol_data {
86	enum ppc64_plt_type type;
87	GElf_Addr resolved_value;
88
89	/* Address of corresponding slot in .plt.  */
90	GElf_Addr plt_slot_addr;
91};
92
93#define ARCH_HAVE_BREAKPOINT_DATA
94struct arch_breakpoint_data {
95	/* We need this just for arch_breakpoint_init.  */
96};
97
98#define ARCH_HAVE_PROCESS_DATA
99struct arch_process_data {
100	/* Breakpoint that hits when the dynamic linker is about to
101	 * update a .plt slot.  NULL before that address is known.  */
102	struct breakpoint *dl_plt_update_bp;
103
104	/* PLT update breakpoint looks here for the handler.  */
105	struct process_stopping_handler *handler;
106};
107
108#endif /* LTRACE_PPC_ARCH_H */
109