| 1 | /* Target-dependent code for Solaris SPARC. |
| 2 | |
| 3 | Copyright (C) 2003-2019 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 "frame.h" |
| 22 | #include "frame-unwind.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "symtab.h" |
| 25 | #include "objfiles.h" |
| 26 | #include "osabi.h" |
| 27 | #include "regcache.h" |
| 28 | #include "regset.h" |
| 29 | #include "target.h" |
| 30 | #include "trad-frame.h" |
| 31 | |
| 32 | #include "sol2-tdep.h" |
| 33 | #include "sparc-tdep.h" |
| 34 | #include "solib-svr4.h" |
| 35 | |
| 36 | /* From <sys/regset.h>. */ |
| 37 | const struct sparc_gregmap sparc32_sol2_gregmap = |
| 38 | { |
| 39 | 32 * 4, /* %psr */ |
| 40 | 33 * 4, /* %pc */ |
| 41 | 34 * 4, /* %npc */ |
| 42 | 35 * 4, /* %y */ |
| 43 | 36 * 4, /* %wim */ |
| 44 | 37 * 4, /* %tbr */ |
| 45 | 1 * 4, /* %g1 */ |
| 46 | 16 * 4, /* %l0 */ |
| 47 | }; |
| 48 | |
| 49 | const struct sparc_fpregmap sparc32_sol2_fpregmap = |
| 50 | { |
| 51 | 0 * 4, /* %f0 */ |
| 52 | 33 * 4, /* %fsr */ |
| 53 | }; |
| 54 | |
| 55 | static void |
| 56 | sparc32_sol2_supply_core_gregset (const struct regset *regset, |
| 57 | struct regcache *regcache, |
| 58 | int regnum, const void *gregs, size_t len) |
| 59 | { |
| 60 | sparc32_supply_gregset (&sparc32_sol2_gregmap, regcache, regnum, gregs); |
| 61 | } |
| 62 | |
| 63 | static void |
| 64 | sparc32_sol2_collect_core_gregset (const struct regset *regset, |
| 65 | const struct regcache *regcache, |
| 66 | int regnum, void *gregs, size_t len) |
| 67 | { |
| 68 | sparc32_collect_gregset (&sparc32_sol2_gregmap, regcache, regnum, gregs); |
| 69 | } |
| 70 | |
| 71 | static void |
| 72 | sparc32_sol2_supply_core_fpregset (const struct regset *regset, |
| 73 | struct regcache *regcache, |
| 74 | int regnum, const void *fpregs, size_t len) |
| 75 | { |
| 76 | sparc32_supply_fpregset (&sparc32_sol2_fpregmap, regcache, regnum, fpregs); |
| 77 | } |
| 78 | |
| 79 | static void |
| 80 | sparc32_sol2_collect_core_fpregset (const struct regset *regset, |
| 81 | const struct regcache *regcache, |
| 82 | int regnum, void *fpregs, size_t len) |
| 83 | { |
| 84 | sparc32_collect_fpregset (&sparc32_sol2_fpregmap, regcache, regnum, fpregs); |
| 85 | } |
| 86 | |
| 87 | static const struct regset sparc32_sol2_gregset = |
| 88 | { |
| 89 | NULL, |
| 90 | sparc32_sol2_supply_core_gregset, |
| 91 | sparc32_sol2_collect_core_gregset |
| 92 | }; |
| 93 | |
| 94 | static const struct regset sparc32_sol2_fpregset = |
| 95 | { |
| 96 | NULL, |
| 97 | sparc32_sol2_supply_core_fpregset, |
| 98 | sparc32_sol2_collect_core_fpregset |
| 99 | }; |
| 100 | \f |
| 101 | |
| 102 | /* The Solaris signal trampolines reside in libc. For normal signals, |
| 103 | the function `sigacthandler' is used. This signal trampoline will |
| 104 | call the signal handler using the System V calling convention, |
| 105 | where the third argument is a pointer to an instance of |
| 106 | `ucontext_t', which has a member `uc_mcontext' that contains the |
| 107 | saved registers. Incidentally, the kernel passes the `ucontext_t' |
| 108 | pointer as the third argument of the signal trampoline too, and |
| 109 | `sigacthandler' simply passes it on. However, if you link your |
| 110 | program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function |
| 111 | `ucbsigvechandler' will be used, which invokes the using the BSD |
| 112 | convention, where the third argument is a pointer to an instance of |
| 113 | `struct sigcontext'. It is the `ucbsigvechandler' function that |
| 114 | converts the `ucontext_t' to a `sigcontext', and back. Unless the |
| 115 | signal handler modifies the `struct sigcontext' we can safely |
| 116 | ignore this. */ |
| 117 | |
| 118 | int |
| 119 | sparc_sol2_pc_in_sigtramp (CORE_ADDR pc, const char *name) |
| 120 | { |
| 121 | return (name && (strcmp (name, "sigacthandler") == 0 |
| 122 | || strcmp (name, "ucbsigvechandler") == 0 |
| 123 | || strcmp (name, "__sighndlr") == 0)); |
| 124 | } |
| 125 | |
| 126 | static struct sparc_frame_cache * |
| 127 | sparc32_sol2_sigtramp_frame_cache (struct frame_info *this_frame, |
| 128 | void **this_cache) |
| 129 | { |
| 130 | struct sparc_frame_cache *cache; |
| 131 | CORE_ADDR mcontext_addr, addr; |
| 132 | int regnum; |
| 133 | |
| 134 | if (*this_cache) |
| 135 | return (struct sparc_frame_cache *) *this_cache; |
| 136 | |
| 137 | cache = sparc_frame_cache (this_frame, this_cache); |
| 138 | gdb_assert (cache == *this_cache); |
| 139 | |
| 140 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 141 | |
| 142 | /* The third argument is a pointer to an instance of `ucontext_t', |
| 143 | which has a member `uc_mcontext' that contains the saved |
| 144 | registers. */ |
| 145 | regnum = |
| 146 | (cache->copied_regs_mask & 0x04) ? SPARC_I2_REGNUM : SPARC_O2_REGNUM; |
| 147 | mcontext_addr = get_frame_register_unsigned (this_frame, regnum) + 40; |
| 148 | |
| 149 | cache->saved_regs[SPARC32_PSR_REGNUM].addr = mcontext_addr + 0 * 4; |
| 150 | cache->saved_regs[SPARC32_PC_REGNUM].addr = mcontext_addr + 1 * 4; |
| 151 | cache->saved_regs[SPARC32_NPC_REGNUM].addr = mcontext_addr + 2 * 4; |
| 152 | cache->saved_regs[SPARC32_Y_REGNUM].addr = mcontext_addr + 3 * 4; |
| 153 | |
| 154 | /* Since %g0 is always zero, keep the identity encoding. */ |
| 155 | for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 4; |
| 156 | regnum <= SPARC_O7_REGNUM; regnum++, addr += 4) |
| 157 | cache->saved_regs[regnum].addr = addr; |
| 158 | |
| 159 | if (get_frame_memory_unsigned (this_frame, mcontext_addr + 19 * 4, 4)) |
| 160 | { |
| 161 | /* The register windows haven't been flushed. */ |
| 162 | for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) |
| 163 | trad_frame_set_unknown (cache->saved_regs, regnum); |
| 164 | } |
| 165 | else |
| 166 | { |
| 167 | addr = cache->saved_regs[SPARC_SP_REGNUM].addr; |
| 168 | addr = get_frame_memory_unsigned (this_frame, addr, 4); |
| 169 | for (regnum = SPARC_L0_REGNUM; |
| 170 | regnum <= SPARC_I7_REGNUM; regnum++, addr += 4) |
| 171 | cache->saved_regs[regnum].addr = addr; |
| 172 | } |
| 173 | |
| 174 | return cache; |
| 175 | } |
| 176 | |
| 177 | static void |
| 178 | sparc32_sol2_sigtramp_frame_this_id (struct frame_info *this_frame, |
| 179 | void **this_cache, |
| 180 | struct frame_id *this_id) |
| 181 | { |
| 182 | struct sparc_frame_cache *cache = |
| 183 | sparc32_sol2_sigtramp_frame_cache (this_frame, this_cache); |
| 184 | |
| 185 | (*this_id) = frame_id_build (cache->base, cache->pc); |
| 186 | } |
| 187 | |
| 188 | static struct value * |
| 189 | sparc32_sol2_sigtramp_frame_prev_register (struct frame_info *this_frame, |
| 190 | void **this_cache, |
| 191 | int regnum) |
| 192 | { |
| 193 | struct sparc_frame_cache *cache = |
| 194 | sparc32_sol2_sigtramp_frame_cache (this_frame, this_cache); |
| 195 | |
| 196 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum); |
| 197 | } |
| 198 | |
| 199 | static int |
| 200 | sparc32_sol2_sigtramp_frame_sniffer (const struct frame_unwind *self, |
| 201 | struct frame_info *this_frame, |
| 202 | void **this_cache) |
| 203 | { |
| 204 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 205 | const char *name; |
| 206 | |
| 207 | find_pc_partial_function (pc, &name, NULL, NULL); |
| 208 | if (sparc_sol2_pc_in_sigtramp (pc, name)) |
| 209 | return 1; |
| 210 | |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static const struct frame_unwind sparc32_sol2_sigtramp_frame_unwind = |
| 215 | { |
| 216 | SIGTRAMP_FRAME, |
| 217 | default_frame_unwind_stop_reason, |
| 218 | sparc32_sol2_sigtramp_frame_this_id, |
| 219 | sparc32_sol2_sigtramp_frame_prev_register, |
| 220 | NULL, |
| 221 | sparc32_sol2_sigtramp_frame_sniffer |
| 222 | }; |
| 223 | |
| 224 | /* Unglobalize NAME. */ |
| 225 | |
| 226 | const char * |
| 227 | sparc_sol2_static_transform_name (const char *name) |
| 228 | { |
| 229 | /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, |
| 230 | SunPRO) convert file static variables into global values, a |
| 231 | process known as globalization. In order to do this, the |
| 232 | compiler will create a unique prefix and prepend it to each file |
| 233 | static variable. For static variables within a function, this |
| 234 | globalization prefix is followed by the function name (nested |
| 235 | static variables within a function are supposed to generate a |
| 236 | warning message, and are left alone). The procedure is |
| 237 | documented in the Stabs Interface Manual, which is distributed |
| 238 | with the compilers, although version 4.0 of the manual seems to |
| 239 | be incorrect in some places, at least for SPARC. The |
| 240 | globalization prefix is encoded into an N_OPT stab, with the form |
| 241 | "G=<prefix>". The globalization prefix always seems to start |
| 242 | with a dollar sign '$'; a dot '.' is used as a separator. So we |
| 243 | simply strip everything up until the last dot. */ |
| 244 | |
| 245 | if (name[0] == '$') |
| 246 | { |
| 247 | const char *p = strrchr (name, '.'); |
| 248 | if (p) |
| 249 | return p + 1; |
| 250 | } |
| 251 | |
| 252 | return name; |
| 253 | } |
| 254 | \f |
| 255 | |
| 256 | void |
| 257 | sparc32_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 258 | { |
| 259 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 260 | |
| 261 | tdep->gregset = &sparc32_sol2_gregset; |
| 262 | tdep->sizeof_gregset = 152; |
| 263 | |
| 264 | tdep->fpregset = &sparc32_sol2_fpregset; |
| 265 | tdep->sizeof_fpregset = 400; |
| 266 | |
| 267 | /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, SunPRO) |
| 268 | compiler puts out 0 instead of the address in N_SO stabs. Starting with |
| 269 | SunPRO 3.0, the compiler does this for N_FUN stabs too. */ |
| 270 | set_gdbarch_sofun_address_maybe_missing (gdbarch, 1); |
| 271 | |
| 272 | /* The Sun compilers also do "globalization"; see the comment in |
| 273 | sparc_sol2_static_transform_name for more information. */ |
| 274 | set_gdbarch_static_transform_name |
| 275 | (gdbarch, sparc_sol2_static_transform_name); |
| 276 | |
| 277 | /* Solaris has SVR4-style shared libraries... */ |
| 278 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| 279 | set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver); |
| 280 | set_solib_svr4_fetch_link_map_offsets |
| 281 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 282 | |
| 283 | /* ...which means that we need some special handling when doing |
| 284 | prologue analysis. */ |
| 285 | tdep->plt_entry_size = 12; |
| 286 | |
| 287 | /* Solaris has kernel-assisted single-stepping support. */ |
| 288 | set_gdbarch_software_single_step (gdbarch, NULL); |
| 289 | |
| 290 | frame_unwind_append_unwinder (gdbarch, &sparc32_sol2_sigtramp_frame_unwind); |
| 291 | |
| 292 | /* How to print LWP PTIDs from core files. */ |
| 293 | set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str); |
| 294 | } |
| 295 | |
| 296 | void |
| 297 | _initialize_sparc_sol2_tdep (void) |
| 298 | { |
| 299 | gdbarch_register_osabi (bfd_arch_sparc, 0, |
| 300 | GDB_OSABI_SOLARIS, sparc32_sol2_init_abi); |
| 301 | } |