| 1 | /* Native-dependent code for SPARC. |
| 2 | |
| 3 | Copyright (C) 2003-2016 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 "inferior.h" |
| 22 | #include "regcache.h" |
| 23 | #include "target.h" |
| 24 | |
| 25 | #include <signal.h> |
| 26 | #include <sys/ptrace.h> |
| 27 | #include "gdb_wait.h" |
| 28 | #ifdef HAVE_MACHINE_REG_H |
| 29 | #include <machine/reg.h> |
| 30 | #endif |
| 31 | |
| 32 | #include "sparc-tdep.h" |
| 33 | #include "sparc-nat.h" |
| 34 | #include "inf-ptrace.h" |
| 35 | |
| 36 | /* With some trickery we can use the code in this file for most (if |
| 37 | not all) ptrace(2) based SPARC systems, which includes SunOS 4, |
| 38 | GNU/Linux and the various SPARC BSD's. |
| 39 | |
| 40 | First, we need a data structure for use with ptrace(2). SunOS has |
| 41 | `struct regs' and `struct fp_status' in <machine/reg.h>. BSD's |
| 42 | have `struct reg' and `struct fpreg' in <machine/reg.h>. GNU/Linux |
| 43 | has the same structures as SunOS 4, but they're in <asm/reg.h>, |
| 44 | which is a kernel header. As a general rule we avoid including |
| 45 | GNU/Linux kernel headers. Fortunately GNU/Linux has a `gregset_t' |
| 46 | and a `fpregset_t' that are equivalent to `struct regs' and `struct |
| 47 | fp_status' in <sys/ucontext.h>, which is automatically included by |
| 48 | <signal.h>. Settling on using the `gregset_t' and `fpregset_t' |
| 49 | typedefs, providing them for the other systems, therefore solves |
| 50 | the puzzle. */ |
| 51 | |
| 52 | #ifdef HAVE_MACHINE_REG_H |
| 53 | #ifdef HAVE_STRUCT_REG |
| 54 | typedef struct reg gregset_t; |
| 55 | typedef struct fpreg fpregset_t; |
| 56 | #else |
| 57 | typedef struct regs gregset_t; |
| 58 | typedef struct fp_status fpregset_t; |
| 59 | #endif |
| 60 | #endif |
| 61 | |
| 62 | /* Second, we need to remap the BSD ptrace(2) requests to their SunOS |
| 63 | equivalents. GNU/Linux already follows SunOS here. */ |
| 64 | |
| 65 | #ifndef PTRACE_GETREGS |
| 66 | #define PTRACE_GETREGS PT_GETREGS |
| 67 | #endif |
| 68 | |
| 69 | #ifndef PTRACE_SETREGS |
| 70 | #define PTRACE_SETREGS PT_SETREGS |
| 71 | #endif |
| 72 | |
| 73 | #ifndef PTRACE_GETFPREGS |
| 74 | #define PTRACE_GETFPREGS PT_GETFPREGS |
| 75 | #endif |
| 76 | |
| 77 | #ifndef PTRACE_SETFPREGS |
| 78 | #define PTRACE_SETFPREGS PT_SETFPREGS |
| 79 | #endif |
| 80 | |
| 81 | /* Register set description. */ |
| 82 | const struct sparc_gregmap *sparc_gregmap; |
| 83 | const struct sparc_fpregmap *sparc_fpregmap; |
| 84 | void (*sparc_supply_gregset) (const struct sparc_gregmap *, |
| 85 | struct regcache *, int , const void *); |
| 86 | void (*sparc_collect_gregset) (const struct sparc_gregmap *, |
| 87 | const struct regcache *, int, void *); |
| 88 | void (*sparc_supply_fpregset) (const struct sparc_fpregmap *, |
| 89 | struct regcache *, int , const void *); |
| 90 | void (*sparc_collect_fpregset) (const struct sparc_fpregmap *, |
| 91 | const struct regcache *, int , void *); |
| 92 | int (*sparc_gregset_supplies_p) (struct gdbarch *, int); |
| 93 | int (*sparc_fpregset_supplies_p) (struct gdbarch *, int); |
| 94 | |
| 95 | /* Determine whether `gregset_t' contains register REGNUM. */ |
| 96 | |
| 97 | int |
| 98 | sparc32_gregset_supplies_p (struct gdbarch *gdbarch, int regnum) |
| 99 | { |
| 100 | /* Integer registers. */ |
| 101 | if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM) |
| 102 | || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM) |
| 103 | || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM) |
| 104 | || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM)) |
| 105 | return 1; |
| 106 | |
| 107 | /* Control registers. */ |
| 108 | if (regnum == SPARC32_PC_REGNUM |
| 109 | || regnum == SPARC32_NPC_REGNUM |
| 110 | || regnum == SPARC32_PSR_REGNUM |
| 111 | || regnum == SPARC32_Y_REGNUM) |
| 112 | return 1; |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | /* Determine whether `fpregset_t' contains register REGNUM. */ |
| 118 | |
| 119 | int |
| 120 | sparc32_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum) |
| 121 | { |
| 122 | /* Floating-point registers. */ |
| 123 | if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM) |
| 124 | return 1; |
| 125 | |
| 126 | /* Control registers. */ |
| 127 | if (regnum == SPARC32_FSR_REGNUM) |
| 128 | return 1; |
| 129 | |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
| 134 | for all registers (including the floating-point registers). */ |
| 135 | |
| 136 | void |
| 137 | sparc_fetch_inferior_registers (struct target_ops *ops, |
| 138 | struct regcache *regcache, int regnum) |
| 139 | { |
| 140 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 141 | int pid; |
| 142 | |
| 143 | /* NOTE: cagney/2002-12-03: This code assumes that the currently |
| 144 | selected light weight processes' registers can be written |
| 145 | directly into the selected thread's register cache. This works |
| 146 | fine when given an 1:1 LWP:thread model (such as found on |
| 147 | GNU/Linux) but will, likely, have problems when used on an N:1 |
| 148 | (userland threads) or N:M (userland multiple LWP) model. In the |
| 149 | case of the latter two, the LWP's registers do not necessarily |
| 150 | belong to the selected thread (the LWP could be in the middle of |
| 151 | executing the thread switch code). |
| 152 | |
| 153 | These functions should instead be paramaterized with an explicit |
| 154 | object (struct regcache, struct thread_info?) into which the LWPs |
| 155 | registers can be written. */ |
| 156 | pid = ptid_get_lwp (inferior_ptid); |
| 157 | if (pid == 0) |
| 158 | pid = ptid_get_pid (inferior_ptid); |
| 159 | |
| 160 | if (regnum == SPARC_G0_REGNUM) |
| 161 | { |
| 162 | gdb_byte zero[8] = { 0 }; |
| 163 | |
| 164 | regcache_raw_supply (regcache, SPARC_G0_REGNUM, &zero); |
| 165 | return; |
| 166 | } |
| 167 | |
| 168 | if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum)) |
| 169 | { |
| 170 | gregset_t regs; |
| 171 | |
| 172 | if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 173 | perror_with_name (_("Couldn't get registers")); |
| 174 | |
| 175 | sparc_supply_gregset (sparc_gregmap, regcache, -1, ®s); |
| 176 | if (regnum != -1) |
| 177 | return; |
| 178 | } |
| 179 | |
| 180 | if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum)) |
| 181 | { |
| 182 | fpregset_t fpregs; |
| 183 | |
| 184 | if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 185 | perror_with_name (_("Couldn't get floating point status")); |
| 186 | |
| 187 | sparc_supply_fpregset (sparc_fpregmap, regcache, -1, &fpregs); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | void |
| 192 | sparc_store_inferior_registers (struct target_ops *ops, |
| 193 | struct regcache *regcache, int regnum) |
| 194 | { |
| 195 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 196 | int pid; |
| 197 | |
| 198 | /* NOTE: cagney/2002-12-02: See comment in fetch_inferior_registers |
| 199 | about threaded assumptions. */ |
| 200 | pid = ptid_get_lwp (inferior_ptid); |
| 201 | if (pid == 0) |
| 202 | pid = ptid_get_pid (inferior_ptid); |
| 203 | |
| 204 | if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum)) |
| 205 | { |
| 206 | gregset_t regs; |
| 207 | |
| 208 | if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 209 | perror_with_name (_("Couldn't get registers")); |
| 210 | |
| 211 | sparc_collect_gregset (sparc_gregmap, regcache, regnum, ®s); |
| 212 | |
| 213 | if (ptrace (PTRACE_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 214 | perror_with_name (_("Couldn't write registers")); |
| 215 | |
| 216 | /* Deal with the stack regs. */ |
| 217 | if (regnum == -1 || regnum == SPARC_SP_REGNUM |
| 218 | || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM)) |
| 219 | { |
| 220 | ULONGEST sp; |
| 221 | |
| 222 | regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); |
| 223 | sparc_collect_rwindow (regcache, sp, regnum); |
| 224 | } |
| 225 | |
| 226 | if (regnum != -1) |
| 227 | return; |
| 228 | } |
| 229 | |
| 230 | if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum)) |
| 231 | { |
| 232 | fpregset_t fpregs, saved_fpregs; |
| 233 | |
| 234 | if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 235 | perror_with_name (_("Couldn't get floating-point registers")); |
| 236 | |
| 237 | memcpy (&saved_fpregs, &fpregs, sizeof (fpregs)); |
| 238 | sparc_collect_fpregset (sparc_fpregmap, regcache, regnum, &fpregs); |
| 239 | |
| 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) |
| 245 | { |
| 246 | if (ptrace (PTRACE_SETFPREGS, pid, |
| 247 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 248 | perror_with_name (_("Couldn't write floating-point registers")); |
| 249 | } |
| 250 | |
| 251 | if (regnum != -1) |
| 252 | return; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | \f |
| 257 | /* Implement the to_xfer_partial target_ops method for |
| 258 | TARGET_OBJECT_WCOOKIE. Fetch StackGhost Per-Process XOR cookie. */ |
| 259 | |
| 260 | static enum target_xfer_status |
| 261 | sparc_xfer_wcookie (struct target_ops *ops, enum target_object object, |
| 262 | const char *annex, gdb_byte *readbuf, |
| 263 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
| 264 | ULONGEST *xfered_len) |
| 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 | |
| 272 | if (offset == sizeof (unsigned long)) |
| 273 | return TARGET_XFER_EOF; /* Signal EOF. */ |
| 274 | if (offset > sizeof (unsigned long)) |
| 275 | return TARGET_XFER_E_IO; |
| 276 | |
| 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 |
| 280 | later). Since release 3.6, OpenBSD uses a fully randomized |
| 281 | cookie. */ |
| 282 | { |
| 283 | int pid = ptid_get_pid (inferior_ptid); |
| 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. */ |
| 291 | if (ptrace (PT_WCOOKIE, pid, (PTRACE_TYPE_ARG3) &wcookie, 0) == -1) |
| 292 | { |
| 293 | if (errno != EINVAL) |
| 294 | perror_with_name (_("Couldn't get StackGhost cookie")); |
| 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 | } |
| 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); |
| 309 | *xfered_len = (ULONGEST) len; |
| 310 | return TARGET_XFER_OK; |
| 311 | } |
| 312 | |
| 313 | target_xfer_partial_ftype *inf_ptrace_xfer_partial; |
| 314 | |
| 315 | static enum target_xfer_status |
| 316 | sparc_xfer_partial (struct target_ops *ops, enum target_object object, |
| 317 | const char *annex, gdb_byte *readbuf, |
| 318 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
| 319 | ULONGEST *xfered_len) |
| 320 | { |
| 321 | if (object == TARGET_OBJECT_WCOOKIE) |
| 322 | return sparc_xfer_wcookie (ops, object, annex, readbuf, writebuf, |
| 323 | offset, len, xfered_len); |
| 324 | |
| 325 | return inf_ptrace_xfer_partial (ops, object, annex, readbuf, writebuf, |
| 326 | offset, len, xfered_len); |
| 327 | } |
| 328 | \f |
| 329 | /* Create a prototype generic SPARC target. The client can override |
| 330 | it with local methods. */ |
| 331 | |
| 332 | struct target_ops * |
| 333 | sparc_target (void) |
| 334 | { |
| 335 | struct target_ops *t; |
| 336 | |
| 337 | t = inf_ptrace_target (); |
| 338 | t->to_fetch_registers = sparc_fetch_inferior_registers; |
| 339 | t->to_store_registers = sparc_store_inferior_registers; |
| 340 | inf_ptrace_xfer_partial = t->to_xfer_partial; |
| 341 | t->to_xfer_partial = sparc_xfer_partial; |
| 342 | return t; |
| 343 | } |
| 344 | |
| 345 | \f |
| 346 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 347 | void _initialize_sparc_nat (void); |
| 348 | |
| 349 | void |
| 350 | _initialize_sparc_nat (void) |
| 351 | { |
| 352 | /* Deafult to using SunOS 4 register sets. */ |
| 353 | if (sparc_gregmap == NULL) |
| 354 | sparc_gregmap = &sparc32_sunos4_gregmap; |
| 355 | if (sparc_fpregmap == NULL) |
| 356 | sparc_fpregmap = &sparc32_sunos4_fpregmap; |
| 357 | if (sparc_supply_gregset == NULL) |
| 358 | sparc_supply_gregset = sparc32_supply_gregset; |
| 359 | if (sparc_collect_gregset == NULL) |
| 360 | sparc_collect_gregset = sparc32_collect_gregset; |
| 361 | if (sparc_supply_fpregset == NULL) |
| 362 | sparc_supply_fpregset = sparc32_supply_fpregset; |
| 363 | if (sparc_collect_fpregset == NULL) |
| 364 | sparc_collect_fpregset = sparc32_collect_fpregset; |
| 365 | if (sparc_gregset_supplies_p == NULL) |
| 366 | sparc_gregset_supplies_p = sparc32_gregset_supplies_p; |
| 367 | if (sparc_fpregset_supplies_p == NULL) |
| 368 | sparc_fpregset_supplies_p = sparc32_fpregset_supplies_p; |
| 369 | } |