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90ad3654 | 1 | /* Target-dependent code for GNU/Linux on RISC-V processors. |
42a4f53d | 2 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
90ad3654 JW |
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 "riscv-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" | |
77c6f5fc JW |
26 | #include "tramp-frame.h" |
27 | #include "trad-frame.h" | |
90ad3654 JW |
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 riscv_linux_gregmap[] = | |
34 | { | |
35 | { 1, RISCV_PC_REGNUM, 0 }, | |
36 | { 31, RISCV_RA_REGNUM, 0 }, /* x1 to x31 */ | |
37 | { 0 } | |
38 | }; | |
39 | ||
40 | /* Define the general register regset. */ | |
41 | ||
42 | static const struct regset riscv_linux_gregset = | |
43 | { | |
44 | riscv_linux_gregmap, regcache_supply_regset, regcache_collect_regset | |
45 | }; | |
46 | ||
47 | /* Define hook for core file support. */ | |
48 | ||
49 | static void | |
50 | riscv_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 | { | |
a616bb94 | 55 | cb (".reg", (32 * riscv_isa_xlen (gdbarch)), (32 * riscv_isa_xlen (gdbarch)), |
90ad3654 JW |
56 | &riscv_linux_gregset, NULL, cb_data); |
57 | ||
58 | /* TODO: Add FP register support. */ | |
59 | } | |
60 | ||
77c6f5fc JW |
61 | /* Signal trampoline support. */ |
62 | ||
63 | static void riscv_linux_sigframe_init (const struct tramp_frame *self, | |
64 | struct frame_info *this_frame, | |
65 | struct trad_frame_cache *this_cache, | |
66 | CORE_ADDR func); | |
67 | ||
68 | #define RISCV_INST_LI_A7_SIGRETURN 0x08b00893 | |
69 | #define RISCV_INST_ECALL 0x00000073 | |
70 | ||
71 | static const struct tramp_frame riscv_linux_sigframe = { | |
72 | SIGTRAMP_FRAME, | |
73 | 4, | |
74 | { | |
75 | { RISCV_INST_LI_A7_SIGRETURN, ULONGEST_MAX }, | |
76 | { RISCV_INST_ECALL, ULONGEST_MAX }, | |
77 | { TRAMP_SENTINEL_INSN } | |
78 | }, | |
79 | riscv_linux_sigframe_init, | |
80 | NULL | |
81 | }; | |
82 | ||
83 | /* Runtime signal frames look like this: | |
84 | struct rt_sigframe { | |
85 | struct siginfo info; | |
86 | struct ucontext uc; | |
87 | }; | |
88 | ||
89 | struct ucontext { | |
90 | unsigned long __uc_flags; | |
91 | struct ucontext *uclink; | |
92 | stack_t uc_stack; | |
93 | sigset_t uc_sigmask; | |
94 | char __glibc_reserved[1024 / 8 - sizeof (sigset_t)]; | |
95 | mcontext_t uc_mcontext; | |
96 | }; */ | |
97 | ||
98 | #define SIGFRAME_SIGINFO_SIZE 128 | |
99 | #define UCONTEXT_MCONTEXT_OFFSET 176 | |
100 | ||
101 | static void | |
102 | riscv_linux_sigframe_init (const struct tramp_frame *self, | |
103 | struct frame_info *this_frame, | |
104 | struct trad_frame_cache *this_cache, | |
105 | CORE_ADDR func) | |
106 | { | |
107 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
108 | int xlen = riscv_isa_xlen (gdbarch); | |
109 | int flen = riscv_isa_flen (gdbarch); | |
110 | CORE_ADDR frame_sp = get_frame_sp (this_frame); | |
111 | CORE_ADDR mcontext_base; | |
112 | CORE_ADDR regs_base; | |
113 | ||
114 | mcontext_base = frame_sp + SIGFRAME_SIGINFO_SIZE + UCONTEXT_MCONTEXT_OFFSET; | |
115 | ||
116 | /* Handle the integer registers. The first one is PC, followed by x1 | |
117 | through x31. */ | |
118 | regs_base = mcontext_base; | |
119 | trad_frame_set_reg_addr (this_cache, RISCV_PC_REGNUM, regs_base); | |
120 | for (int i = 1; i < 32; i++) | |
121 | trad_frame_set_reg_addr (this_cache, RISCV_ZERO_REGNUM + i, | |
122 | regs_base + (i * xlen)); | |
123 | ||
124 | /* Handle the FP registers. First comes the 32 FP registers, followed by | |
125 | fcsr. */ | |
126 | regs_base += 32 * xlen; | |
127 | for (int i = 0; i < 32; i++) | |
128 | trad_frame_set_reg_addr (this_cache, RISCV_FIRST_FP_REGNUM + i, | |
129 | regs_base + (i * flen)); | |
130 | regs_base += 32 * flen; | |
131 | trad_frame_set_reg_addr (this_cache, RISCV_CSR_FCSR_REGNUM, regs_base); | |
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 | ||
90ad3654 JW |
137 | /* Initialize RISC-V Linux ABI info. */ |
138 | ||
139 | static void | |
140 | riscv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
141 | { | |
142 | linux_init_abi (info, gdbarch); | |
143 | ||
144 | set_gdbarch_software_single_step (gdbarch, riscv_software_single_step); | |
145 | ||
146 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
147 | (riscv_isa_xlen (gdbarch) == 4 | |
148 | ? svr4_ilp32_fetch_link_map_offsets | |
149 | : svr4_lp64_fetch_link_map_offsets)); | |
150 | ||
151 | /* GNU/Linux uses SVR4-style shared libraries. */ | |
152 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
153 | ||
154 | /* GNU/Linux uses the dynamic linker included in the GNU C Library. */ | |
155 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); | |
156 | ||
157 | /* Enable TLS support. */ | |
158 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
159 | svr4_fetch_objfile_link_map); | |
160 | ||
161 | set_gdbarch_iterate_over_regset_sections | |
162 | (gdbarch, riscv_linux_iterate_over_regset_sections); | |
77c6f5fc JW |
163 | |
164 | tramp_frame_prepend_unwinder (gdbarch, &riscv_linux_sigframe); | |
90ad3654 JW |
165 | } |
166 | ||
167 | /* Initialize RISC-V Linux target support. */ | |
168 | ||
169 | void | |
170 | _initialize_riscv_linux_tdep (void) | |
171 | { | |
172 | gdbarch_register_osabi (bfd_arch_riscv, 0, GDB_OSABI_LINUX, | |
173 | riscv_linux_init_abi); | |
174 | } |