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a1217d97 SL |
1 | /* Target-dependent code for GNU/Linux on Nios II. |
2 | Copyright (C) 2012-2013 Free Software Foundation, Inc. | |
3 | Contributed by Mentor Graphics, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU 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, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "gdb_assert.h" | |
0e9f083f | 23 | #include <string.h> |
a1217d97 SL |
24 | #include "osabi.h" |
25 | #include "solib-svr4.h" | |
26 | #include "trad-frame.h" | |
27 | #include "tramp-frame.h" | |
28 | #include "symtab.h" | |
29 | #include "regset.h" | |
30 | #include "regcache.h" | |
31 | #include "linux-tdep.h" | |
32 | #include "glibc-tdep.h" | |
33 | #include "nios2-tdep.h" | |
34 | ||
35 | #include "features/nios2-linux.c" | |
36 | ||
37 | /* Core file and register set support. */ | |
38 | ||
39 | /* Map from the normal register enumeration order to the order that | |
40 | registers appear in core files, which corresponds to the order | |
41 | of the register slots in the kernel's struct pt_regs. */ | |
42 | ||
43 | static const int reg_offsets[NIOS2_NUM_REGS] = | |
44 | { | |
45 | -1, 8, 9, 10, 11, 12, 13, 14, /* r0 - r7 */ | |
46 | 0, 1, 2, 3, 4, 5, 6, 7, /* r8 - r15 */ | |
47 | 23, 24, 25, 26, 27, 28, 29, 30, /* r16 - r23 */ | |
0b76b0ce | 48 | -1, -1, 19, 18, 17, 21, -1, 16, /* et bt gp sp fp ea sstatus ra */ |
a1217d97 SL |
49 | 21, /* pc */ |
50 | -1, 20, -1, -1, -1, -1, -1, -1, /* status estatus ... */ | |
51 | -1, -1, -1, -1, -1, -1, -1, -1 | |
52 | }; | |
53 | ||
54 | /* Implement the supply_regset hook for core files. */ | |
55 | ||
56 | static void | |
57 | nios2_supply_gregset (const struct regset *regset, | |
58 | struct regcache *regcache, | |
59 | int regnum, const void *gregs_buf, size_t len) | |
60 | { | |
61 | const gdb_byte *gregs = gregs_buf; | |
62 | int regno; | |
63 | static const gdb_byte zero_buf[4] = {0, 0, 0, 0}; | |
64 | ||
65 | for (regno = NIOS2_Z_REGNUM; regno <= NIOS2_MPUACC_REGNUM; regno++) | |
66 | if (regnum == -1 || regnum == regno) | |
67 | { | |
68 | if (reg_offsets[regno] != -1) | |
69 | regcache_raw_supply (regcache, regno, | |
70 | gregs + 4 * reg_offsets[regno]); | |
71 | else | |
72 | regcache_raw_supply (regcache, regno, zero_buf); | |
73 | } | |
74 | } | |
75 | ||
76 | static struct regset nios2_core_regset = | |
77 | { | |
78 | NULL, | |
79 | nios2_supply_gregset, | |
80 | NULL, | |
81 | NULL | |
82 | }; | |
83 | ||
84 | /* Implement the regset_from_core_section gdbarch method. */ | |
85 | ||
86 | static const struct regset * | |
87 | nios2_regset_from_core_section (struct gdbarch *gdbarch, | |
88 | const char *sect_name, size_t sect_size) | |
89 | { | |
90 | if (strcmp (sect_name, ".reg") == 0) | |
91 | return &nios2_core_regset; | |
92 | ||
93 | return NULL; | |
94 | } | |
95 | ||
a1217d97 SL |
96 | /* Initialize a trad-frame cache corresponding to the tramp-frame. |
97 | FUNC is the address of the instruction TRAMP[0] in memory. */ | |
98 | ||
99 | static void | |
100 | nios2_linux_rt_sigreturn_init (const struct tramp_frame *self, | |
101 | struct frame_info *next_frame, | |
102 | struct trad_frame_cache *this_cache, | |
103 | CORE_ADDR func) | |
104 | { | |
105 | CORE_ADDR base = func + 41 * 4; | |
106 | int i; | |
107 | ||
108 | for (i = 0; i < 23; i++) | |
109 | trad_frame_set_reg_addr (this_cache, i + 1, base + i * 4); | |
110 | trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 23 * 4); | |
111 | trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 24 * 4); | |
112 | trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 25 * 4); | |
113 | trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 27 * 4); | |
114 | trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 28 * 4); | |
115 | ||
116 | /* Save a frame ID. */ | |
117 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
118 | } | |
119 | ||
a1217d97 SL |
120 | static struct tramp_frame nios2_linux_rt_sigreturn_tramp_frame = |
121 | { | |
122 | SIGTRAMP_FRAME, | |
123 | 4, | |
124 | { | |
21986715 | 125 | { 0x00800004 | (139 << 6), -1 }, /* movi r2,__NR_rt_sigreturn */ |
a1217d97 SL |
126 | { 0x003b683a, -1 }, /* trap */ |
127 | { TRAMP_SENTINEL_INSN } | |
128 | }, | |
129 | nios2_linux_rt_sigreturn_init | |
130 | }; | |
131 | ||
132 | /* When FRAME is at a syscall instruction, return the PC of the next | |
133 | instruction to be executed. */ | |
134 | ||
135 | static CORE_ADDR | |
136 | nios2_linux_syscall_next_pc (struct frame_info *frame) | |
137 | { | |
138 | CORE_ADDR pc = get_frame_pc (frame); | |
139 | ULONGEST syscall_nr = get_frame_register_unsigned (frame, NIOS2_R2_REGNUM); | |
140 | ||
141 | /* If we are about to make a sigreturn syscall, use the unwinder to | |
142 | decode the signal frame. */ | |
21986715 | 143 | if (syscall_nr == 139 /* rt_sigreturn */) |
a1217d97 SL |
144 | return frame_unwind_caller_pc (frame); |
145 | ||
146 | return pc + NIOS2_OPCODE_SIZE; | |
147 | } | |
148 | ||
149 | /* Hook function for gdbarch_register_osabi. */ | |
150 | ||
151 | static void | |
152 | nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
153 | { | |
154 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
155 | ||
156 | linux_init_abi (info, gdbarch); | |
157 | ||
158 | /* Shared library handling. */ | |
159 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
160 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); | |
161 | ||
162 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
163 | svr4_ilp32_fetch_link_map_offsets); | |
164 | /* Enable TLS support. */ | |
165 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
166 | svr4_fetch_objfile_link_map); | |
167 | /* Core file support. */ | |
168 | set_gdbarch_regset_from_core_section (gdbarch, | |
169 | nios2_regset_from_core_section); | |
170 | /* Linux signal frame unwinders. */ | |
a1217d97 SL |
171 | tramp_frame_prepend_unwinder (gdbarch, |
172 | &nios2_linux_rt_sigreturn_tramp_frame); | |
173 | ||
174 | tdep->syscall_next_pc = nios2_linux_syscall_next_pc; | |
175 | ||
176 | /* Index of target address word in glibc jmp_buf. */ | |
177 | tdep->jb_pc = 10; | |
178 | } | |
179 | ||
180 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
181 | ||
182 | extern initialize_file_ftype _initialize_nios2_linux_tdep; | |
183 | ||
184 | void | |
185 | _initialize_nios2_linux_tdep (void) | |
186 | { | |
187 | gdbarch_register_osabi (bfd_arch_nios2, 0, GDB_OSABI_LINUX, | |
188 | nios2_linux_init_abi); | |
189 | ||
190 | initialize_tdesc_nios2_linux (); | |
191 | } |