arch.h revision af9e30ec852a24f52a36775154ff79cc4be0193d 
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 PLT_REINITALISATION_BP    "_start"
41
42#define ARCH_HAVE_ATOMIC_SINGLESTEP
43#define ARCH_HAVE_ADD_PLT_ENTRY
44#define ARCH_HAVE_TRANSLATE_ADDRESS
45#define ARCH_HAVE_DYNLINK_DONE
46#define ARCH_HAVE_FETCH_ARG
47#define ARCH_ENDIAN_BIG
48#define ARCH_HAVE_SIZEOF
49#define ARCH_HAVE_ALIGNOF
50
51struct library_symbol;
52
53#define ARCH_HAVE_LTELF_DATA
54struct arch_ltelf_data {
55	GElf_Addr plt_stub_vma;
56	struct library_symbol *stubs;
57	Elf_Data *opd_data;
58	GElf_Addr opd_base;
59	GElf_Xword opd_size;
60	int secure_plt;
61};
62
63#define ARCH_HAVE_LIBRARY_DATA
64struct arch_library_data {
65	int bss_plt_prelinked;
66};
67
68enum ppc64_plt_type {
69	/* Either a non-PLT symbol, or PPC32 symbol.  */
70	PPC_DEFAULT = 0,
71
72	/* PPC64 STUB, never resolved.  */
73	PPC64_PLT_STUB,
74
75	/* Unresolved PLT symbol (.plt contains PLT address).  */
76	PPC_PLT_UNRESOLVED,
77
78	/* Resolved PLT symbol.  The corresponding .plt slot contained
79	 * target address, which was changed to the address of
80	 * corresponding PLT entry.  The original is now saved in
81	 * RESOLVED_VALUE.  */
82	PPC_PLT_RESOLVED,
83};
84
85#define ARCH_HAVE_LIBRARY_SYMBOL_DATA
86struct arch_library_symbol_data {
87	enum ppc64_plt_type type;
88	GElf_Addr resolved_value;
89
90	/* Address of corresponding slot in .plt.  */
91	GElf_Addr plt_slot_addr;
92};
93
94#define ARCH_HAVE_BREAKPOINT_DATA
95struct arch_breakpoint_data {
96	/* We need this just for arch_breakpoint_init.  */
97};
98
99#define ARCH_HAVE_PROCESS_DATA
100struct arch_process_data {
101	/* Breakpoint that hits when the dynamic linker is about to
102	 * update a .plt slot.  NULL before that address is known.  */
103	struct breakpoint *dl_plt_update_bp;
104
105	/* PLT update breakpoint looks here for the handler.  */
106	struct process_stopping_handler *handler;
107};
108
109#endif /* LTRACE_PPC_ARCH_H */
110