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78664fa3 PA |
1 | /* ARM Symbian OS target support. |
2 | ||
3 | Copyright (C) 2008, 2009, 2010 | |
4 | Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "objfiles.h" | |
24 | #include "osabi.h" | |
25 | #include "solib.h" | |
26 | #include "solib-target.h" | |
27 | #include "target.h" | |
28 | #include "elf-bfd.h" | |
29 | ||
30 | /* If PC is in a DLL import stub, return the address of the `real' | |
31 | function belonging to the stub. */ | |
32 | ||
33 | CORE_ADDR | |
34 | arm_symbian_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) | |
35 | { | |
36 | struct gdbarch *gdbarch; | |
37 | enum bfd_endian byte_order; | |
38 | ULONGEST insn; | |
39 | CORE_ADDR dest; | |
40 | gdb_byte buf[4]; | |
41 | ||
42 | if (!in_plt_section (pc, NULL)) | |
43 | return 0; | |
44 | ||
45 | if (target_read_memory (pc, buf, 4) != 0) | |
46 | return 0; | |
47 | ||
48 | gdbarch = get_frame_arch (frame); | |
49 | byte_order = gdbarch_byte_order (gdbarch); | |
50 | ||
51 | /* ldr pc, [pc, #-4]. */ | |
52 | insn = extract_unsigned_integer (buf, 4, byte_order); | |
53 | if (insn != 0xe51ff004) | |
54 | return 0; | |
55 | ||
56 | if (target_read_memory (pc + 4, buf, 4) != 0) | |
57 | return 0; | |
58 | ||
59 | dest = extract_unsigned_integer (buf, 4, byte_order); | |
60 | return gdbarch_addr_bits_remove (gdbarch, dest); | |
61 | } | |
62 | ||
63 | static void | |
64 | arm_symbian_init_abi (struct gdbarch_info info, | |
65 | struct gdbarch *gdbarch) | |
66 | { | |
67 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
68 | ||
69 | /* Shared library handling. */ | |
70 | set_gdbarch_skip_trampoline_code (gdbarch, arm_symbian_skip_trampoline_code); | |
71 | ||
08105857 PA |
72 | /* On this target, the toolchain outputs ELF files, with `sym' for |
73 | filename extension (e.g., `FOO.sym'); these are post-linker | |
74 | processed into PE-ish DLLs (e.g., `FOO.dll'), and it's these that | |
75 | are actually copied to and run on the target. Naturally, when | |
76 | listing shared libraries, Symbian stubs report the DLL filenames. | |
77 | Setting this makes it so that GDB automatically looks for the | |
78 | corresponding ELF files on the host's filesystem. */ | |
79 | set_gdbarch_solib_symbols_extension (gdbarch, "sym"); | |
80 | ||
ab38a727 PA |
81 | /* Canonical paths on this target look like `c:\sys\bin\bar.dll', |
82 | for example. */ | |
83 | set_gdbarch_has_dos_based_file_system (gdbarch, 1); | |
84 | ||
78664fa3 PA |
85 | set_solib_ops (gdbarch, &solib_target_so_ops); |
86 | } | |
87 | ||
88 | /* Recognize Symbian object files. */ | |
89 | ||
90 | static enum gdb_osabi | |
91 | arm_symbian_osabi_sniffer (bfd *abfd) | |
92 | { | |
93 | Elf_Internal_Phdr *phdrs, **segments; | |
94 | long phdrs_size; | |
95 | int num_phdrs, i; | |
96 | ||
97 | /* Symbian executables are always shared objects (ET_DYN). */ | |
98 | if (elf_elfheader (abfd)->e_type == ET_EXEC) | |
99 | return GDB_OSABI_UNKNOWN; | |
100 | ||
101 | if (elf_elfheader (abfd)->e_ident[EI_OSABI] != ELFOSABI_NONE) | |
102 | return GDB_OSABI_UNKNOWN; | |
103 | ||
104 | /* Check for the ELF headers not being part of any PT_LOAD segment. | |
105 | Symbian is the only GDB supported (or GNU binutils supported) ARM | |
106 | target which uses a postlinker to flatten ELF files, dropping the | |
107 | ELF dynamic info in the process. */ | |
108 | phdrs_size = bfd_get_elf_phdr_upper_bound (abfd); | |
109 | if (phdrs_size == -1) | |
110 | return GDB_OSABI_UNKNOWN; | |
111 | ||
112 | phdrs = alloca (phdrs_size); | |
113 | num_phdrs = bfd_get_elf_phdrs (abfd, phdrs); | |
114 | if (num_phdrs == -1) | |
115 | return GDB_OSABI_UNKNOWN; | |
116 | ||
117 | for (i = 0; i < num_phdrs; i++) | |
118 | if (phdrs[i].p_type == PT_LOAD && phdrs[i].p_offset == 0) | |
119 | return GDB_OSABI_UNKNOWN; | |
120 | ||
121 | /* Looks like a Symbian binary. */ | |
122 | return GDB_OSABI_SYMBIAN; | |
123 | } | |
124 | ||
125 | void | |
126 | _initialize_arm_symbian_tdep (void) | |
127 | { | |
128 | gdbarch_register_osabi_sniffer (bfd_arch_arm, | |
129 | bfd_target_elf_flavour, | |
130 | arm_symbian_osabi_sniffer); | |
131 | ||
132 | gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_SYMBIAN, | |
133 | arm_symbian_init_abi); | |
134 | } |