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abc08782 MK |
1 | /* Target-dependent code for OpenBSD/mips64. |
2 | ||
1d506c26 | 3 | Copyright (C) 2004-2024 Free Software Foundation, Inc. |
abc08782 MK |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
abc08782 MK |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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19 | |
20 | #include "defs.h" | |
89fa5cc8 | 21 | #include "gdbtypes.h" |
abc08782 MK |
22 | #include "osabi.h" |
23 | #include "regcache.h" | |
24 | #include "regset.h" | |
8e763687 MK |
25 | #include "trad-frame.h" |
26 | #include "tramp-frame.h" | |
abc08782 | 27 | |
3cdd631f | 28 | #include "obsd-tdep.h" |
abc08782 MK |
29 | #include "mips-tdep.h" |
30 | #include "solib-svr4.h" | |
31 | ||
32 | #define MIPS64OBSD_NUM_REGS 73 | |
33 | ||
34 | /* Core file support. */ | |
35 | ||
36 | /* Supply register REGNUM from the buffer specified by GREGS and LEN | |
37 | in the general-purpose register set REGSET to register cache | |
38 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
39 | ||
40 | static void | |
41 | mips64obsd_supply_gregset (const struct regset *regset, | |
42 | struct regcache *regcache, int regnum, | |
43 | const void *gregs, size_t len) | |
44 | { | |
19ba03f4 | 45 | const char *regs = (const char *) gregs; |
abc08782 MK |
46 | int i; |
47 | ||
48 | for (i = 0; i < MIPS64OBSD_NUM_REGS; i++) | |
49 | { | |
50 | if (regnum == i || regnum == -1) | |
73e1c03f | 51 | regcache->raw_supply (i, regs + i * 8); |
abc08782 MK |
52 | } |
53 | } | |
54 | ||
55 | /* OpenBSD/mips64 register set. */ | |
56 | ||
3ca7dae4 | 57 | static const struct regset mips64obsd_gregset = |
abc08782 MK |
58 | { |
59 | NULL, | |
60 | mips64obsd_supply_gregset | |
61 | }; | |
62 | ||
d4036235 | 63 | /* Iterate over core file register note sections. */ |
abc08782 | 64 | |
d4036235 AA |
65 | static void |
66 | mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch, | |
67 | iterate_over_regset_sections_cb *cb, | |
68 | void *cb_data, | |
69 | const struct regcache *regcache) | |
abc08782 | 70 | { |
a616bb94 AH |
71 | cb (".reg", MIPS64OBSD_NUM_REGS * 8, MIPS64OBSD_NUM_REGS * 8, |
72 | &mips64obsd_gregset, NULL, cb_data); | |
abc08782 MK |
73 | } |
74 | \f | |
75 | ||
8e763687 MK |
76 | /* Signal trampolines. */ |
77 | ||
78 | static void | |
79 | mips64obsd_sigframe_init (const struct tramp_frame *self, | |
bd2b40ac | 80 | frame_info_ptr this_frame, |
8e763687 MK |
81 | struct trad_frame_cache *cache, |
82 | CORE_ADDR func) | |
83 | { | |
b8a22b94 | 84 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
8e763687 MK |
85 | CORE_ADDR sp, sigcontext_addr, addr; |
86 | int regnum; | |
87 | ||
88 | /* We find the appropriate instance of `struct sigcontext' at a | |
89 | fixed offset in the signal frame. */ | |
b8a22b94 DJ |
90 | sp = get_frame_register_signed (this_frame, |
91 | MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch)); | |
8e763687 MK |
92 | sigcontext_addr = sp + 32; |
93 | ||
94 | /* PC. */ | |
95 | regnum = mips_regnum (gdbarch)->pc; | |
f57d151a | 96 | trad_frame_set_reg_addr (cache, |
2eb4d78b | 97 | regnum + gdbarch_num_regs (gdbarch), |
f57d151a | 98 | sigcontext_addr + 16); |
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99 | |
100 | /* GPRs. */ | |
101 | for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32; | |
102 | regnum <= MIPS_RA_REGNUM; regnum++, addr += 8) | |
f57d151a | 103 | trad_frame_set_reg_addr (cache, |
2eb4d78b | 104 | regnum + gdbarch_num_regs (gdbarch), |
f57d151a | 105 | addr); |
8e763687 MK |
106 | |
107 | /* HI and LO. */ | |
108 | regnum = mips_regnum (gdbarch)->lo; | |
f57d151a | 109 | trad_frame_set_reg_addr (cache, |
2eb4d78b | 110 | regnum + gdbarch_num_regs (gdbarch), |
f57d151a | 111 | sigcontext_addr + 280); |
8e763687 | 112 | regnum = mips_regnum (gdbarch)->hi; |
f57d151a | 113 | trad_frame_set_reg_addr (cache, |
2eb4d78b | 114 | regnum + gdbarch_num_regs (gdbarch), |
f57d151a | 115 | sigcontext_addr + 288); |
8e763687 MK |
116 | |
117 | /* TODO: Handle the floating-point registers. */ | |
118 | ||
119 | trad_frame_set_id (cache, frame_id_build (sp, func)); | |
120 | } | |
121 | ||
122 | static const struct tramp_frame mips64obsd_sigframe = | |
123 | { | |
124 | SIGTRAMP_FRAME, | |
125 | MIPS_INSN32_SIZE, | |
126 | { | |
7bc02706 TT |
127 | { 0x67a40020, ULONGEST_MAX }, /* daddiu a0,sp,32 */ |
128 | { 0x24020067, ULONGEST_MAX }, /* li v0,103 */ | |
129 | { 0x0000000c, ULONGEST_MAX }, /* syscall */ | |
130 | { 0x0000000d, ULONGEST_MAX }, /* break */ | |
131 | { TRAMP_SENTINEL_INSN, ULONGEST_MAX } | |
8e763687 MK |
132 | }, |
133 | mips64obsd_sigframe_init | |
134 | }; | |
135 | ||
136 | \f | |
abc08782 MK |
137 | static void |
138 | mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
139 | { | |
8e763687 MK |
140 | /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged |
141 | way GDB works, forces us to pretend we can handle them all. */ | |
142 | ||
d4036235 AA |
143 | set_gdbarch_iterate_over_regset_sections |
144 | (gdbarch, mips64obsd_iterate_over_regset_sections); | |
abc08782 | 145 | |
8e763687 MK |
146 | tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe); |
147 | ||
89fa5cc8 | 148 | set_gdbarch_long_double_bit (gdbarch, 128); |
552f1157 | 149 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_quad); |
89fa5cc8 | 150 | |
3cdd631f MK |
151 | obsd_init_abi(info, gdbarch); |
152 | ||
8e763687 | 153 | /* OpenBSD/mips64 has SVR4-style shared libraries. */ |
abc08782 MK |
154 | set_solib_svr4_fetch_link_map_offsets |
155 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
156 | } | |
157 | ||
6c265988 | 158 | void _initialize_mips64obsd_tdep (); |
abc08782 | 159 | void |
6c265988 | 160 | _initialize_mips64obsd_tdep () |
abc08782 | 161 | { |
1736a7bd | 162 | gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD, |
abc08782 MK |
163 | mips64obsd_init_abi); |
164 | } |