arch.h revision fa844db00b61b9f61c9ae8c6f4165aa5fff3a5d7 
1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2012,2013 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_SW_SINGLESTEP
41#define ARCH_HAVE_ADD_PLT_ENTRY
42#define ARCH_HAVE_ADD_FUNC_ENTRY
43#define ARCH_HAVE_TRANSLATE_ADDRESS
44#define ARCH_HAVE_DYNLINK_DONE
45#define ARCH_HAVE_FETCH_ARG
46#define ARCH_ENDIAN_BIG
47#define ARCH_HAVE_SIZEOF
48#define ARCH_HAVE_ALIGNOF
49
50struct library_symbol;
51
52#define ARCH_HAVE_LTELF_DATA
53struct arch_ltelf_data {
54	GElf_Addr plt_stub_vma;
55	struct library_symbol *stubs;
56	Elf_Data *opd_data;
57	GElf_Addr opd_base;
58	GElf_Xword opd_size;
59	int secure_plt;
60
61	Elf_Data *reladyn;
62	size_t reladyn_count;
63};
64
65#define ARCH_HAVE_LIBRARY_DATA
66struct arch_library_data {
67	GElf_Addr pltgot_addr;
68	int bss_plt_prelinked;
69};
70
71enum ppc64_plt_type {
72	/* Either a non-PLT symbol, or PPC32 symbol.  */
73	PPC_DEFAULT = 0,
74
75	/* PPC64 STUB, never resolved.  */
76	PPC64_PLT_STUB,
77
78	/* Unresolved PLT symbol (.plt contains PLT address).  */
79	PPC_PLT_UNRESOLVED,
80
81	/* Resolved PLT symbol.  The corresponding .plt slot contained
82	 * target address, which was changed to the address of
83	 * corresponding PLT entry.  The original is now saved in
84	 * RESOLVED_VALUE.  */
85	PPC_PLT_RESOLVED,
86
87	/* Very similar to PPC_PLT_UNRESOLVED, but for JMP_IREL
88	 * slots.  */
89	PPC_PLT_IRELATIVE,
90};
91
92#define ARCH_HAVE_LIBRARY_SYMBOL_DATA
93struct arch_library_symbol_data {
94	enum ppc64_plt_type type;
95	GElf_Addr resolved_value;
96
97	/* Address of corresponding slot in .plt.  */
98	GElf_Addr plt_slot_addr;
99};
100
101#define ARCH_HAVE_BREAKPOINT_DATA
102struct arch_breakpoint_data {
103	/* This is where we hide symbol for IRELATIVE breakpoint for
104	 * the first time that it hits.  This is NULL for normal
105	 * breakpoints.  */
106	struct library_symbol *irel_libsym;
107};
108
109#define ARCH_HAVE_PROCESS_DATA
110struct arch_process_data {
111	/* Breakpoint that hits when the dynamic linker is about to
112	 * update a .plt slot.  NULL before that address is known.  */
113	struct breakpoint *dl_plt_update_bp;
114
115	/* PLT update breakpoint looks here for the handler.  */
116	struct process_stopping_handler *handler;
117};
118
119#endif /* LTRACE_PPC_ARCH_H */
120