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386c036b | 1 | /* Native-dependent code for SPARC. |
2555fe1a | 2 | |
1d506c26 | 3 | Copyright (C) 2003-2024 Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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 |
c5aa993b | 10 | (at your option) any later version. |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b | 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/>. */ |
c906108c | 19 | |
c906108c | 20 | #include "inferior.h" |
4e052eda | 21 | #include "regcache.h" |
baf92889 | 22 | #include "target.h" |
c906108c SS |
23 | |
24 | #include <signal.h> | |
25 | #include <sys/ptrace.h> | |
268a13a5 | 26 | #include "gdbsupport/gdb_wait.h" |
386c036b | 27 | #ifdef HAVE_MACHINE_REG_H |
c906108c SS |
28 | #include <machine/reg.h> |
29 | #endif | |
c906108c | 30 | |
386c036b MK |
31 | #include "sparc-tdep.h" |
32 | #include "sparc-nat.h" | |
1b9445c2 | 33 | #include "inf-ptrace.h" |
386c036b MK |
34 | |
35 | /* With some trickery we can use the code in this file for most (if | |
36 | not all) ptrace(2) based SPARC systems, which includes SunOS 4, | |
1a111ce3 | 37 | GNU/Linux and the various SPARC BSD's. |
386c036b MK |
38 | |
39 | First, we need a data structure for use with ptrace(2). SunOS has | |
40 | `struct regs' and `struct fp_status' in <machine/reg.h>. BSD's | |
41 | have `struct reg' and `struct fpreg' in <machine/reg.h>. GNU/Linux | |
42 | has the same structures as SunOS 4, but they're in <asm/reg.h>, | |
43 | which is a kernel header. As a general rule we avoid including | |
44 | GNU/Linux kernel headers. Fortunately GNU/Linux has a `gregset_t' | |
45 | and a `fpregset_t' that are equivalent to `struct regs' and `struct | |
46 | fp_status' in <sys/ucontext.h>, which is automatically included by | |
47 | <signal.h>. Settling on using the `gregset_t' and `fpregset_t' | |
48 | typedefs, providing them for the other systems, therefore solves | |
49 | the puzzle. */ | |
50 | ||
51 | #ifdef HAVE_MACHINE_REG_H | |
52 | #ifdef HAVE_STRUCT_REG | |
53 | typedef struct reg gregset_t; | |
54 | typedef struct fpreg fpregset_t; | |
55 | #else | |
56 | typedef struct regs gregset_t; | |
57 | typedef struct fp_status fpregset_t; | |
58 | #endif | |
59 | #endif | |
60 | ||
61 | /* Second, we need to remap the BSD ptrace(2) requests to their SunOS | |
62 | equivalents. GNU/Linux already follows SunOS here. */ | |
c906108c | 63 | |
386c036b MK |
64 | #ifndef PTRACE_GETREGS |
65 | #define PTRACE_GETREGS PT_GETREGS | |
66 | #endif | |
67 | ||
68 | #ifndef PTRACE_SETREGS | |
69 | #define PTRACE_SETREGS PT_SETREGS | |
70 | #endif | |
c906108c | 71 | |
386c036b MK |
72 | #ifndef PTRACE_GETFPREGS |
73 | #define PTRACE_GETFPREGS PT_GETFPREGS | |
74 | #endif | |
75 | ||
76 | #ifndef PTRACE_SETFPREGS | |
77 | #define PTRACE_SETFPREGS PT_SETFPREGS | |
78 | #endif | |
79 | ||
1ff700c2 | 80 | static PTRACE_TYPE_RET |
2108a63a KR |
81 | gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr) |
82 | { | |
83 | #ifdef __NetBSD__ | |
84 | /* Support for NetBSD threads: unlike other ptrace implementations in this | |
85 | file, NetBSD requires that we pass both the pid and lwp. */ | |
86 | return ptrace (request, ptid.pid (), addr, ptid.lwp ()); | |
87 | #else | |
88 | pid_t pid = get_ptrace_pid (ptid); | |
89 | return ptrace (request, pid, addr, 0); | |
90 | #endif | |
91 | } | |
92 | ||
386c036b | 93 | /* Register set description. */ |
b4fd25c9 AA |
94 | const struct sparc_gregmap *sparc_gregmap; |
95 | const struct sparc_fpregmap *sparc_fpregmap; | |
96 | void (*sparc_supply_gregset) (const struct sparc_gregmap *, | |
386c036b | 97 | struct regcache *, int , const void *); |
b4fd25c9 | 98 | void (*sparc_collect_gregset) (const struct sparc_gregmap *, |
386c036b | 99 | const struct regcache *, int, void *); |
b4fd25c9 | 100 | void (*sparc_supply_fpregset) (const struct sparc_fpregmap *, |
db75c717 | 101 | struct regcache *, int , const void *); |
b4fd25c9 | 102 | void (*sparc_collect_fpregset) (const struct sparc_fpregmap *, |
db75c717 | 103 | const struct regcache *, int , void *); |
ec22ec34 UW |
104 | int (*sparc_gregset_supplies_p) (struct gdbarch *, int); |
105 | int (*sparc_fpregset_supplies_p) (struct gdbarch *, int); | |
386c036b MK |
106 | |
107 | /* Determine whether `gregset_t' contains register REGNUM. */ | |
108 | ||
109 | int | |
ec22ec34 | 110 | sparc32_gregset_supplies_p (struct gdbarch *gdbarch, int regnum) |
386c036b MK |
111 | { |
112 | /* Integer registers. */ | |
113 | if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM) | |
114 | || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM) | |
115 | || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM) | |
116 | || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM)) | |
117 | return 1; | |
118 | ||
119 | /* Control registers. */ | |
120 | if (regnum == SPARC32_PC_REGNUM | |
121 | || regnum == SPARC32_NPC_REGNUM | |
122 | || regnum == SPARC32_PSR_REGNUM | |
123 | || regnum == SPARC32_Y_REGNUM) | |
124 | return 1; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | /* Determine whether `fpregset_t' contains register REGNUM. */ | |
130 | ||
131 | int | |
ec22ec34 | 132 | sparc32_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum) |
386c036b MK |
133 | { |
134 | /* Floating-point registers. */ | |
135 | if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM) | |
136 | return 1; | |
137 | ||
138 | /* Control registers. */ | |
139 | if (regnum == SPARC32_FSR_REGNUM) | |
140 | return 1; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
146 | for all registers (including the floating-point registers). */ | |
c906108c SS |
147 | |
148 | void | |
d1e93af6 SM |
149 | sparc_fetch_inferior_registers (process_stratum_target *proc_target, |
150 | regcache *regcache, int regnum) | |
c906108c | 151 | { |
ac7936df | 152 | struct gdbarch *gdbarch = regcache->arch (); |
2108a63a | 153 | ptid_t ptid = regcache->ptid (); |
02ae7771 | 154 | |
386c036b | 155 | if (regnum == SPARC_G0_REGNUM) |
c906108c | 156 | { |
22e74ef9 MK |
157 | gdb_byte zero[8] = { 0 }; |
158 | ||
73e1c03f | 159 | regcache->raw_supply (SPARC_G0_REGNUM, &zero); |
386c036b | 160 | return; |
c906108c SS |
161 | } |
162 | ||
ec22ec34 | 163 | if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum)) |
c906108c | 164 | { |
386c036b | 165 | gregset_t regs; |
c906108c | 166 | |
2108a63a | 167 | if (gdb_ptrace (PTRACE_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1) |
e2e0b3e5 | 168 | perror_with_name (_("Couldn't get registers")); |
386c036b | 169 | |
d1e93af6 SM |
170 | /* Deep down, sparc_supply_rwindow reads memory, so needs the global |
171 | thread context to be set. */ | |
cfa8e270 SM |
172 | scoped_restore restore_inferior_ptid |
173 | = make_scoped_restore (&inferior_ptid, ptid); | |
d1e93af6 | 174 | |
b4fd25c9 | 175 | sparc_supply_gregset (sparc_gregmap, regcache, -1, ®s); |
386c036b MK |
176 | if (regnum != -1) |
177 | return; | |
c906108c | 178 | } |
386c036b | 179 | |
ec22ec34 | 180 | if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum)) |
c906108c | 181 | { |
386c036b MK |
182 | fpregset_t fpregs; |
183 | ||
2108a63a | 184 | if (gdb_ptrace (PTRACE_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs) == -1) |
e2e0b3e5 | 185 | perror_with_name (_("Couldn't get floating point status")); |
386c036b | 186 | |
b4fd25c9 | 187 | sparc_supply_fpregset (sparc_fpregmap, regcache, -1, &fpregs); |
c906108c SS |
188 | } |
189 | } | |
190 | ||
c906108c | 191 | void |
d1e93af6 SM |
192 | sparc_store_inferior_registers (process_stratum_target *proc_target, |
193 | regcache *regcache, int regnum) | |
c906108c | 194 | { |
ac7936df | 195 | struct gdbarch *gdbarch = regcache->arch (); |
2108a63a | 196 | ptid_t ptid = regcache->ptid (); |
c906108c | 197 | |
ec22ec34 | 198 | if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum)) |
e1925118 | 199 | { |
386c036b | 200 | gregset_t regs; |
c906108c | 201 | |
2108a63a | 202 | if (gdb_ptrace (PTRACE_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1) |
e2e0b3e5 | 203 | perror_with_name (_("Couldn't get registers")); |
c906108c | 204 | |
b4fd25c9 | 205 | sparc_collect_gregset (sparc_gregmap, regcache, regnum, ®s); |
c906108c | 206 | |
2108a63a | 207 | if (gdb_ptrace (PTRACE_SETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1) |
e2e0b3e5 | 208 | perror_with_name (_("Couldn't write registers")); |
c5aa993b | 209 | |
386c036b MK |
210 | /* Deal with the stack regs. */ |
211 | if (regnum == -1 || regnum == SPARC_SP_REGNUM | |
212 | || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM)) | |
213 | { | |
214 | ULONGEST sp; | |
c906108c | 215 | |
386c036b | 216 | regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); |
d1e93af6 SM |
217 | |
218 | /* Deep down, sparc_collect_rwindow writes memory, so needs the global | |
219 | thread context to be set. */ | |
cfa8e270 SM |
220 | scoped_restore restore_inferior_ptid |
221 | = make_scoped_restore (&inferior_ptid, ptid); | |
d1e93af6 | 222 | |
386c036b MK |
223 | sparc_collect_rwindow (regcache, sp, regnum); |
224 | } | |
c906108c | 225 | |
386c036b MK |
226 | if (regnum != -1) |
227 | return; | |
c906108c | 228 | } |
c906108c | 229 | |
ec22ec34 | 230 | if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum)) |
c5aa993b | 231 | { |
386c036b | 232 | fpregset_t fpregs, saved_fpregs; |
c906108c | 233 | |
2108a63a | 234 | if (gdb_ptrace (PTRACE_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs) == -1) |
e2e0b3e5 | 235 | perror_with_name (_("Couldn't get floating-point registers")); |
c906108c | 236 | |
386c036b | 237 | memcpy (&saved_fpregs, &fpregs, sizeof (fpregs)); |
b4fd25c9 | 238 | sparc_collect_fpregset (sparc_fpregmap, regcache, regnum, &fpregs); |
c906108c | 239 | |
386c036b MK |
240 | /* Writing the floating-point registers will fail on NetBSD with |
241 | EINVAL if the inferior process doesn't have an FPU state | |
242 | (i.e. if it didn't use the FPU yet). Therefore we don't try | |
243 | to write the registers if nothing changed. */ | |
244 | if (memcmp (&saved_fpregs, &fpregs, sizeof (fpregs)) != 0) | |
c5aa993b | 245 | { |
2108a63a KR |
246 | if (gdb_ptrace (PTRACE_SETFPREGS, ptid, |
247 | (PTRACE_TYPE_ARG3) &fpregs) == -1) | |
e2e0b3e5 | 248 | perror_with_name (_("Couldn't write floating-point registers")); |
c5aa993b | 249 | } |
c906108c | 250 | |
386c036b MK |
251 | if (regnum != -1) |
252 | return; | |
253 | } | |
c906108c | 254 | } |
baf92889 | 255 | |
c906108c | 256 | \f |
edcc890f YQ |
257 | /* Implement the to_xfer_partial target_ops method for |
258 | TARGET_OBJECT_WCOOKIE. Fetch StackGhost Per-Process XOR cookie. */ | |
baf92889 | 259 | |
f6ac5f3d | 260 | enum target_xfer_status |
cadc9cb8 | 261 | sparc_xfer_wcookie (enum target_object object, |
961cb7b5 | 262 | const char *annex, gdb_byte *readbuf, |
9b409511 YQ |
263 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
264 | ULONGEST *xfered_len) | |
baf92889 MK |
265 | { |
266 | unsigned long wcookie = 0; | |
267 | char *buf = (char *)&wcookie; | |
268 | ||
269 | gdb_assert (object == TARGET_OBJECT_WCOOKIE); | |
270 | gdb_assert (readbuf && writebuf == NULL); | |
271 | ||
2c9771d3 | 272 | if (offset == sizeof (unsigned long)) |
9b409511 | 273 | return TARGET_XFER_EOF; /* Signal EOF. */ |
2c9771d3 | 274 | if (offset > sizeof (unsigned long)) |
2ed4b548 | 275 | return TARGET_XFER_E_IO; |
c5aa993b | 276 | |
baf92889 MK |
277 | #ifdef PT_WCOOKIE |
278 | /* If PT_WCOOKIE is defined (by <sys/ptrace.h>), assume we're | |
279 | running on an OpenBSD release that uses StackGhost (3.1 or | |
2c9771d3 MK |
280 | later). Since release 3.6, OpenBSD uses a fully randomized |
281 | cookie. */ | |
645d6d10 | 282 | { |
e99b03dc | 283 | int pid = inferior_ptid.pid (); |
645d6d10 MK |
284 | |
285 | /* Sanity check. The proper type for a cookie is register_t, but | |
286 | we can't assume that this type exists on all systems supported | |
287 | by the code in this file. */ | |
288 | gdb_assert (sizeof (wcookie) == sizeof (register_t)); | |
289 | ||
290 | /* Fetch the cookie. */ | |
49ec097f | 291 | if (ptrace (PT_WCOOKIE, pid, (PTRACE_TYPE_ARG3) &wcookie, 0) == -1) |
645d6d10 MK |
292 | { |
293 | if (errno != EINVAL) | |
e2e0b3e5 | 294 | perror_with_name (_("Couldn't get StackGhost cookie")); |
645d6d10 MK |
295 | |
296 | /* Although PT_WCOOKIE is defined on OpenBSD 3.1 and later, | |
297 | the request wasn't implemented until after OpenBSD 3.4. If | |
298 | the kernel doesn't support the PT_WCOOKIE request, assume | |
299 | we're running on a kernel that uses non-randomized cookies. */ | |
300 | wcookie = 0x3; | |
301 | } | |
302 | } | |
baf92889 MK |
303 | #endif /* PT_WCOOKIE */ |
304 | ||
305 | if (len > sizeof (unsigned long) - offset) | |
306 | len = sizeof (unsigned long) - offset; | |
307 | ||
308 | memcpy (readbuf, buf + offset, len); | |
9b409511 YQ |
309 | *xfered_len = (ULONGEST) len; |
310 | return TARGET_XFER_OK; | |
baf92889 | 311 | } |
1b9445c2 | 312 | \f |
baf92889 | 313 | |
6c265988 | 314 | void _initialize_sparc_nat (); |
c906108c | 315 | void |
6c265988 | 316 | _initialize_sparc_nat () |
c906108c | 317 | { |
405feb71 | 318 | /* Default to using SunOS 4 register sets. */ |
b4fd25c9 AA |
319 | if (sparc_gregmap == NULL) |
320 | sparc_gregmap = &sparc32_sunos4_gregmap; | |
321 | if (sparc_fpregmap == NULL) | |
322 | sparc_fpregmap = &sparc32_sunos4_fpregmap; | |
386c036b MK |
323 | if (sparc_supply_gregset == NULL) |
324 | sparc_supply_gregset = sparc32_supply_gregset; | |
325 | if (sparc_collect_gregset == NULL) | |
326 | sparc_collect_gregset = sparc32_collect_gregset; | |
327 | if (sparc_supply_fpregset == NULL) | |
328 | sparc_supply_fpregset = sparc32_supply_fpregset; | |
329 | if (sparc_collect_fpregset == NULL) | |
330 | sparc_collect_fpregset = sparc32_collect_fpregset; | |
331 | if (sparc_gregset_supplies_p == NULL) | |
332 | sparc_gregset_supplies_p = sparc32_gregset_supplies_p; | |
333 | if (sparc_fpregset_supplies_p == NULL) | |
334 | sparc_fpregset_supplies_p = sparc32_fpregset_supplies_p; | |
c906108c | 335 | } |