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42e151bf | 1 | /* Target-dependent code for GNU/Linux on OpenRISC processors. |
42a4f53d | 2 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
42e151bf SH |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "defs.h" | |
20 | #include "or1k-tdep.h" | |
21 | #include "osabi.h" | |
22 | #include "glibc-tdep.h" | |
23 | #include "linux-tdep.h" | |
24 | #include "solib-svr4.h" | |
25 | #include "regset.h" | |
26 | #include "tramp-frame.h" | |
27 | #include "trad-frame.h" | |
28 | ||
29 | /* Define the general register mapping. The kernel puts the PC at offset 0, | |
30 | gdb puts it at offset 32. Register x0 is always 0 and can be ignored. | |
31 | Registers x1 to x31 are in the same place. */ | |
32 | ||
33 | static const struct regcache_map_entry or1k_linux_gregmap[] = | |
34 | { | |
35 | { 32, OR1K_ZERO_REGNUM, 4 }, /* r0 to r31 */ | |
36 | { 1, OR1K_NPC_REGNUM, 4 }, | |
37 | { 0 } | |
38 | }; | |
39 | ||
40 | /* Define the general register regset. */ | |
41 | ||
42 | static const struct regset or1k_linux_gregset = | |
43 | { | |
44 | or1k_linux_gregmap, regcache_supply_regset, regcache_collect_regset | |
45 | }; | |
46 | ||
47 | /* Define hook for core file support. */ | |
48 | ||
49 | static void | |
50 | or1k_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, | |
51 | iterate_over_regset_sections_cb *cb, | |
52 | void *cb_data, | |
53 | const struct regcache *regcache) | |
54 | { | |
55 | cb (".reg", (33 * 4), (33 * 4), &or1k_linux_gregset, NULL, cb_data); | |
56 | } | |
57 | ||
58 | /* Signal trampoline support. */ | |
59 | ||
60 | static void or1k_linux_sigframe_init (const struct tramp_frame *self, | |
61 | struct frame_info *this_frame, | |
62 | struct trad_frame_cache *this_cache, | |
63 | CORE_ADDR func); | |
64 | ||
65 | #define OR1K_RT_SIGRETURN 139 | |
66 | ||
67 | #define OR1K_INST_L_ORI_R11_R0_IMM 0xa9600000 | |
68 | #define OR1K_INST_L_SYS_1 0x20000001 | |
69 | #define OR1K_INST_L_NOP 0x15000000 | |
70 | ||
71 | static const struct tramp_frame or1k_linux_sigframe = { | |
72 | SIGTRAMP_FRAME, | |
73 | 4, | |
74 | { | |
75 | { OR1K_INST_L_ORI_R11_R0_IMM | OR1K_RT_SIGRETURN, ULONGEST_MAX }, | |
76 | { OR1K_INST_L_SYS_1, ULONGEST_MAX }, | |
77 | { OR1K_INST_L_NOP, ULONGEST_MAX }, | |
78 | { TRAMP_SENTINEL_INSN } | |
79 | }, | |
80 | or1k_linux_sigframe_init, | |
81 | NULL | |
82 | }; | |
83 | ||
84 | /* Runtime signal frames look like this: | |
85 | struct rt_sigframe { | |
86 | struct siginfo info; | |
87 | struct ucontext uc; | |
88 | unsigned char retcode[16]; | |
89 | }; | |
90 | ||
91 | struct ucontext { | |
92 | unsigned long uc_flags; - 4 | |
93 | struct ucontext *uc_link; - 4 | |
94 | stack_t uc_stack; - 4 * 3 | |
95 | struct sigcontext uc_mcontext; | |
96 | sigset_t uc_sigmask; | |
97 | }; | |
98 | ||
99 | struct sigcontext { | |
100 | struct user_regs_struct regs; | |
101 | unsigned long oldmask; | |
102 | }; | |
103 | ||
104 | struct user_regs_struct { | |
105 | unsigned long gpr[32]; | |
106 | unsigned long pc; | |
107 | unsigned long sr; | |
108 | }; */ | |
109 | ||
110 | #define SIGFRAME_SIGINFO_SIZE 128 | |
111 | #define UCONTEXT_MCONTEXT_OFFSET 20 | |
112 | ||
113 | static void | |
114 | or1k_linux_sigframe_init (const struct tramp_frame *self, | |
115 | struct frame_info *this_frame, | |
116 | struct trad_frame_cache *this_cache, | |
117 | CORE_ADDR func) | |
118 | { | |
119 | CORE_ADDR frame_sp = get_frame_sp (this_frame); | |
120 | CORE_ADDR mcontext_base; | |
121 | CORE_ADDR regs_base; | |
122 | ||
123 | mcontext_base = frame_sp + SIGFRAME_SIGINFO_SIZE + UCONTEXT_MCONTEXT_OFFSET; | |
124 | ||
125 | /* Handle the general registers 0-31 followed by the PC. */ | |
126 | regs_base = mcontext_base; | |
127 | for (int i = 0; i < 32; i++) | |
128 | trad_frame_set_reg_addr (this_cache, OR1K_ZERO_REGNUM + i, | |
129 | regs_base + (i * 4)); | |
130 | trad_frame_set_reg_addr (this_cache, OR1K_NPC_REGNUM, regs_base + (32 * 4)); | |
131 | trad_frame_set_reg_addr (this_cache, OR1K_SR_REGNUM, regs_base + (33 * 4)); | |
132 | ||
133 | /* Choice of the bottom of the sigframe is somewhat arbitrary. */ | |
134 | trad_frame_set_id (this_cache, frame_id_build (frame_sp, func)); | |
135 | } | |
136 | ||
137 | /* Initialize OpenRISC Linux ABI info. */ | |
138 | ||
139 | static void | |
140 | or1k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
141 | { | |
142 | linux_init_abi (info, gdbarch); | |
143 | ||
144 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
145 | svr4_ilp32_fetch_link_map_offsets); | |
146 | ||
147 | /* GNU/Linux uses SVR4-style shared libraries. */ | |
148 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
149 | ||
150 | /* GNU/Linux uses the dynamic linker included in the GNU C Library. */ | |
151 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); | |
152 | ||
153 | /* Enable TLS support. */ | |
154 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
155 | svr4_fetch_objfile_link_map); | |
156 | ||
157 | set_gdbarch_iterate_over_regset_sections | |
158 | (gdbarch, or1k_linux_iterate_over_regset_sections); | |
159 | ||
160 | tramp_frame_prepend_unwinder (gdbarch, &or1k_linux_sigframe); | |
161 | } | |
162 | ||
163 | /* Initialize OpenRISC Linux target support. */ | |
164 | ||
165 | void | |
166 | _initialize_or1k_linux_tdep (void) | |
167 | { | |
168 | gdbarch_register_osabi (bfd_arch_or1k, 0, GDB_OSABI_LINUX, | |
169 | or1k_linux_init_abi); | |
170 | } |