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/tmp/gdb-8.1/gdb/mips64-obsd-tdep.c
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1 /* Target-dependent code for OpenBSD/mips64.
2
3 Copyright (C) 2004-2018 Free Software Foundation, 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 "gdbtypes.h"
22 #include "osabi.h"
23 #include "regcache.h"
24 #include "regset.h"
25 #include "trad-frame.h"
26 #include "tramp-frame.h"
27
28 #include "obsd-tdep.h"
29 #include "mips-tdep.h"
30 #include "solib-svr4.h"
31
32 /* The MIPS64 Floating-Point Quad-Precision format is similar to
33 big-endian IA-64 Quad-Precision format. */
34 #define floatformats_mips64_quad floatformats_ia64_quad
35
36 #define MIPS64OBSD_NUM_REGS 73
37
38 /* Core file support. */
39
40 /* Supply register REGNUM from the buffer specified by GREGS and LEN
41 in the general-purpose register set REGSET to register cache
42 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
43
44 static void
45 mips64obsd_supply_gregset (const struct regset *regset,
46 struct regcache *regcache, int regnum,
47 const void *gregs, size_t len)
48 {
49 const char *regs = (const char *) gregs;
50 int i;
51
52 for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
53 {
54 if (regnum == i || regnum == -1)
55 regcache_raw_supply (regcache, i, regs + i * 8);
56 }
57 }
58
59 /* OpenBSD/mips64 register set. */
60
61 static const struct regset mips64obsd_gregset =
62 {
63 NULL,
64 mips64obsd_supply_gregset
65 };
66
67 /* Iterate over core file register note sections. */
68
69 static void
70 mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
71 iterate_over_regset_sections_cb *cb,
72 void *cb_data,
73 const struct regcache *regcache)
74 {
75 cb (".reg", MIPS64OBSD_NUM_REGS * 8, &mips64obsd_gregset, NULL, cb_data);
76 }
77
78
79 /* Signal trampolines. */
80
81 static void
82 mips64obsd_sigframe_init (const struct tramp_frame *self,
83 struct frame_info *this_frame,
84 struct trad_frame_cache *cache,
85 CORE_ADDR func)
86 {
87 struct gdbarch *gdbarch = get_frame_arch (this_frame);
88 CORE_ADDR sp, sigcontext_addr, addr;
89 int regnum;
90
91 /* We find the appropriate instance of `struct sigcontext' at a
92 fixed offset in the signal frame. */
93 sp = get_frame_register_signed (this_frame,
94 MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
95 sigcontext_addr = sp + 32;
96
97 /* PC. */
98 regnum = mips_regnum (gdbarch)->pc;
99 trad_frame_set_reg_addr (cache,
100 regnum + gdbarch_num_regs (gdbarch),
101 sigcontext_addr + 16);
102
103 /* GPRs. */
104 for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
105 regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
106 trad_frame_set_reg_addr (cache,
107 regnum + gdbarch_num_regs (gdbarch),
108 addr);
109
110 /* HI and LO. */
111 regnum = mips_regnum (gdbarch)->lo;
112 trad_frame_set_reg_addr (cache,
113 regnum + gdbarch_num_regs (gdbarch),
114 sigcontext_addr + 280);
115 regnum = mips_regnum (gdbarch)->hi;
116 trad_frame_set_reg_addr (cache,
117 regnum + gdbarch_num_regs (gdbarch),
118 sigcontext_addr + 288);
119
120 /* TODO: Handle the floating-point registers. */
121
122 trad_frame_set_id (cache, frame_id_build (sp, func));
123 }
124
125 static const struct tramp_frame mips64obsd_sigframe =
126 {
127 SIGTRAMP_FRAME,
128 MIPS_INSN32_SIZE,
129 {
130 { 0x67a40020, -1 }, /* daddiu a0,sp,32 */
131 { 0x24020067, -1 }, /* li v0,103 */
132 { 0x0000000c, -1 }, /* syscall */
133 { 0x0000000d, -1 }, /* break */
134 { TRAMP_SENTINEL_INSN, -1 }
135 },
136 mips64obsd_sigframe_init
137 };
138
139
140 static void
141 mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
142 {
143 /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
144 way GDB works, forces us to pretend we can handle them all. */
145
146 set_gdbarch_iterate_over_regset_sections
147 (gdbarch, mips64obsd_iterate_over_regset_sections);
148
149 tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
150
151 set_gdbarch_long_double_bit (gdbarch, 128);
152 set_gdbarch_long_double_format (gdbarch, floatformats_mips64_quad);
153
154 obsd_init_abi(info, gdbarch);
155
156 /* OpenBSD/mips64 has SVR4-style shared libraries. */
157 set_solib_svr4_fetch_link_map_offsets
158 (gdbarch, svr4_lp64_fetch_link_map_offsets);
159 }
160
161 void
162 _initialize_mips64obsd_tdep (void)
163 {
164 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD,
165 mips64obsd_init_abi);
166 }
gdbarch
Definition: gdbarch.c:127
trad_frame_set_reg_addr
void trad_frame_set_reg_addr(struct trad_frame_cache *this_trad_cache, int regnum, CORE_ADDR addr)
Definition: trad-frame.c:126
frame_id_build
struct frame_id frame_id_build(CORE_ADDR stack_addr, CORE_ADDR code_addr)
Definition: frame.c:624
obsd-tdep.h
MIPS_AT_REGNUM
Definition: mips-tdep.h:126
CORE_ADDR
bfd_vma CORE_ADDR
Definition: common-types.h:41
TRAMP_SENTINEL_INSN
#define TRAMP_SENTINEL_INSN
Definition: tramp-frame.h:44
svr4_lp64_fetch_link_map_offsets
struct link_map_offsets * svr4_lp64_fetch_link_map_offsets(void)
Definition: solib-svr4.c:3214
func
void(* func)(char *)
Definition: remote-fileio.c:1104
iterate_over_regset_sections_cb
void() iterate_over_regset_sections_cb(const char *sect_name, int size, const struct regset *regset, const char *human_name, void *cb_data)
Definition: gdbarch.h:99
trad_frame_set_id
void trad_frame_set_id(struct trad_frame_cache *this_trad_cache, struct frame_id this_id)
Definition: trad-frame.c:171
_initialize_mips64obsd_tdep
void _initialize_mips64obsd_tdep(void)
Definition: mips64-obsd-tdep.c:162
SIGTRAMP_FRAME
Definition: frame.h:255
MIPS_SP_REGNUM
Definition: mips-tdep.h:132
frame_info
Definition: frame.c:85
gdbarch_num_regs
int gdbarch_num_regs(struct gdbarch *gdbarch)
Definition: gdbarch.c:2039
defs.h
mips_regnum
const struct mips_regnum * mips_regnum(struct gdbarch *gdbarch)
Definition: mips-tdep.c:218
obsd_init_abi
void obsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition: obsd-tdep.c:319
floatformats_mips64_quad
#define floatformats_mips64_quad
Definition: mips64-obsd-tdep.c:34
mips64obsd_sigframe
static const struct tramp_frame mips64obsd_sigframe
Definition: mips64-obsd-tdep.c:125
regset
Definition: regset.h:34
trad-frame.h
solib-svr4.h
osabi.h
trad_frame_cache
Definition: trad-frame.c:27
regcache.h
set_solib_svr4_fetch_link_map_offsets
void set_solib_svr4_fetch_link_map_offsets(struct gdbarch *gdbarch, struct link_map_offsets *(*flmo)(void))
Definition: solib-svr4.c:3137
mips64obsd_iterate_over_regset_sections
static void mips64obsd_iterate_over_regset_sections(struct gdbarch *gdbarch, iterate_over_regset_sections_cb *cb, void *cb_data, const struct regcache *regcache)
Definition: mips64-obsd-tdep.c:70
get_frame_register_signed
LONGEST get_frame_register_signed(struct frame_info *frame, int regnum)
Definition: frame.c:1273
regnum
int regnum
Definition: aarch64-tdep.c:77
gdbarch_register_osabi
void gdbarch_register_osabi(enum bfd_architecture arch, unsigned long machine, enum gdb_osabi osabi, void(*init_osabi)(struct gdbarch_info, struct gdbarch *))
Definition: osabi.c:143
tramp-frame.h
MIPS_INSN32_SIZE
Definition: mips-tdep.h:151
MIPS64OBSD_NUM_REGS
#define MIPS64OBSD_NUM_REGS
Definition: mips64-obsd-tdep.c:36
mips64obsd_supply_gregset
static void mips64obsd_supply_gregset(const struct regset *regset, struct regcache *regcache, int regnum, const void *gregs, size_t len)
Definition: mips64-obsd-tdep.c:45
tramp_frame_prepend_unwinder
void tramp_frame_prepend_unwinder(struct gdbarch *gdbarch, const struct tramp_frame *tramp_frame)
Definition: tramp-frame.c:146
mips64obsd_sigframe_init
static void mips64obsd_sigframe_init(const struct tramp_frame *self, struct frame_info *this_frame, struct trad_frame_cache *cache, CORE_ADDR func)
Definition: mips64-obsd-tdep.c:82
mips-tdep.h
regcache_raw_supply
void regcache_raw_supply(struct regcache *regcache, int regnum, const void *buf)
Definition: regcache.c:1004
gdbtypes.h
regcache
Definition: regcache.h:232
gdbarch_info
Definition: gdbarch.h:1626
set_gdbarch_long_double_bit
void set_gdbarch_long_double_bit(struct gdbarch *gdbarch, int long_double_bit)
Definition: gdbarch.c:1756
regset.h
set_gdbarch_long_double_format
void set_gdbarch_long_double_format(struct gdbarch *gdbarch, const struct floatformat **long_double_format)
Definition: gdbarch.c:1772
tramp_frame
Definition: tramp-frame.h:46
mips_regnum::pc
int pc
Definition: mips-tdep.h:62
set_gdbarch_iterate_over_regset_sections
void set_gdbarch_iterate_over_regset_sections(struct gdbarch *gdbarch, gdbarch_iterate_over_regset_sections_ftype iterate_over_regset_sections)
Definition: gdbarch.c:3647
mips64obsd_gregset
static const struct regset mips64obsd_gregset
Definition: mips64-obsd-tdep.c:61
GDB_OSABI_OPENBSD
Definition: defs.h:520
MIPS_RA_REGNUM
Definition: mips-tdep.h:133
mips_regnum::lo
int lo
Definition: mips-tdep.h:69
get_frame_arch
struct gdbarch * get_frame_arch(struct frame_info *this_frame)
Definition: frame.c:2691
mips64obsd_init_abi
static void mips64obsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition: mips64-obsd-tdep.c:141
mips_regnum::hi
int hi
Definition: mips-tdep.h:68