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1 | /* Target-dependent code for Motorola 68000 BSD's. |
2 | ||
61baf725 | 3 | Copyright (C) 2004-2017 Free Software Foundation, Inc. |
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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 |
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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" | |
21 | #include "arch-utils.h" | |
059cb7d2 | 22 | #include "frame.h" |
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23 | #include "osabi.h" |
24 | #include "regcache.h" | |
25 | #include "regset.h" | |
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26 | #include "trad-frame.h" |
27 | #include "tramp-frame.h" | |
ec20a626 | 28 | #include "gdbtypes.h" |
8f2d3ea0 | 29 | |
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30 | #include "m68k-tdep.h" |
31 | #include "solib-svr4.h" | |
32 | ||
33 | /* Core file support. */ | |
34 | ||
35 | /* Sizeof `struct reg' in <machine/reg.h>. */ | |
36 | #define M68KBSD_SIZEOF_GREGS (18 * 4) | |
37 | ||
38 | /* Sizeof `struct fpreg' in <machine/reg.h. */ | |
39 | #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4) | |
40 | ||
41 | int | |
6ba38425 | 42 | m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum) |
8f2d3ea0 | 43 | { |
6ba38425 | 44 | int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum)); |
8ed86d01 | 45 | |
8f2d3ea0 | 46 | if (regnum >= M68K_FPC_REGNUM) |
8ed86d01 | 47 | return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4; |
8f2d3ea0 | 48 | |
8ed86d01 | 49 | return (regnum - M68K_FP0_REGNUM) * fp_len; |
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50 | } |
51 | ||
52 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN | |
53 | in the floating-point register set REGSET to register cache | |
54 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
55 | ||
56 | static void | |
57 | m68kbsd_supply_fpregset (const struct regset *regset, | |
58 | struct regcache *regcache, | |
59 | int regnum, const void *fpregs, size_t len) | |
60 | { | |
ac7936df | 61 | struct gdbarch *gdbarch = regcache->arch (); |
9a3c8263 | 62 | const gdb_byte *regs = (const gdb_byte *) fpregs; |
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63 | int i; |
64 | ||
65 | gdb_assert (len >= M68KBSD_SIZEOF_FPREGS); | |
66 | ||
67 | for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++) | |
68 | { | |
69 | if (regnum == i || regnum == -1) | |
6ba38425 UW |
70 | regcache_raw_supply (regcache, i, |
71 | regs + m68kbsd_fpreg_offset (gdbarch, i)); | |
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72 | } |
73 | } | |
74 | ||
75 | /* Supply register REGNUM from the buffer specified by GREGS and LEN | |
76 | in the general-purpose register set REGSET to register cache | |
77 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
78 | ||
79 | static void | |
80 | m68kbsd_supply_gregset (const struct regset *regset, | |
81 | struct regcache *regcache, | |
82 | int regnum, const void *gregs, size_t len) | |
83 | { | |
9a3c8263 | 84 | const gdb_byte *regs = (const gdb_byte *) gregs; |
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85 | int i; |
86 | ||
87 | gdb_assert (len >= M68KBSD_SIZEOF_GREGS); | |
88 | ||
89 | for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) | |
90 | { | |
91 | if (regnum == i || regnum == -1) | |
92 | regcache_raw_supply (regcache, i, regs + i * 4); | |
93 | } | |
94 | ||
95 | if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS) | |
96 | { | |
97 | regs += M68KBSD_SIZEOF_GREGS; | |
98 | len -= M68KBSD_SIZEOF_GREGS; | |
99 | m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len); | |
100 | } | |
101 | } | |
102 | ||
103 | /* Motorola 68000 register sets. */ | |
104 | ||
3ca7dae4 | 105 | static const struct regset m68kbsd_gregset = |
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106 | { |
107 | NULL, | |
f962539a AA |
108 | m68kbsd_supply_gregset, |
109 | NULL, | |
110 | REGSET_VARIABLE_SIZE | |
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111 | }; |
112 | ||
3ca7dae4 | 113 | static const struct regset m68kbsd_fpregset = |
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114 | { |
115 | NULL, | |
116 | m68kbsd_supply_fpregset | |
117 | }; | |
118 | ||
022c98ab | 119 | /* Iterate over core file register note sections. */ |
8f2d3ea0 | 120 | |
022c98ab AA |
121 | static void |
122 | m68kbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, | |
123 | iterate_over_regset_sections_cb *cb, | |
124 | void *cb_data, | |
125 | const struct regcache *regcache) | |
8f2d3ea0 | 126 | { |
022c98ab AA |
127 | cb (".reg", M68KBSD_SIZEOF_GREGS, &m68kbsd_gregset, NULL, cb_data); |
128 | cb (".reg2", M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset, NULL, cb_data); | |
8f2d3ea0 | 129 | } |
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130 | \f |
131 | ||
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132 | static void |
133 | m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
134 | { | |
135 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
136 | ||
137 | tdep->jb_pc = 5; | |
138 | tdep->jb_elt_size = 4; | |
139 | ||
9418f048 UW |
140 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
141 | ||
022c98ab AA |
142 | set_gdbarch_iterate_over_regset_sections |
143 | (gdbarch, m68kbsd_iterate_over_regset_sections); | |
8f2d3ea0 | 144 | |
5ab5aa0f MK |
145 | /* NetBSD ELF uses the SVR4 ABI. */ |
146 | m68k_svr4_init_abi (info, gdbarch); | |
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147 | tdep->struct_return = pcc_struct_return; |
148 | ||
149 | /* NetBSD ELF uses SVR4-style shared libraries. */ | |
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150 | set_solib_svr4_fetch_link_map_offsets |
151 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
152 | } | |
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153 | |
154 | void | |
155 | _initialize_m68kbsd_tdep (void) | |
156 | { | |
1736a7bd PA |
157 | gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD, |
158 | m68kbsd_init_abi); | |
8f2d3ea0 | 159 | } |