| 1 | /* Target-dependent code for GNU/Linux UltraSPARC. |
| 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 "frame.h" |
| 22 | #include "frame-unwind.h" |
| 23 | #include "dwarf2-frame.h" |
| 24 | #include "regset.h" |
| 25 | #include "regcache.h" |
| 26 | #include "gdbarch.h" |
| 27 | #include "gdbcore.h" |
| 28 | #include "osabi.h" |
| 29 | #include "solib-svr4.h" |
| 30 | #include "symtab.h" |
| 31 | #include "trad-frame.h" |
| 32 | #include "tramp-frame.h" |
| 33 | #include "xml-syscall.h" |
| 34 | #include "linux-tdep.h" |
| 35 | |
| 36 | /* The syscall's XML filename for sparc 64-bit. */ |
| 37 | #define XML_SYSCALL_FILENAME_SPARC64 "syscalls/sparc64-linux.xml" |
| 38 | |
| 39 | #include "sparc64-tdep.h" |
| 40 | |
| 41 | /* Signal trampoline support. */ |
| 42 | |
| 43 | static void sparc64_linux_sigframe_init (const struct tramp_frame *self, |
| 44 | struct frame_info *this_frame, |
| 45 | struct trad_frame_cache *this_cache, |
| 46 | CORE_ADDR func); |
| 47 | |
| 48 | /* See sparc-linux-tdep.c for details. Note that 64-bit binaries only |
| 49 | use RT signals. */ |
| 50 | |
| 51 | static const struct tramp_frame sparc64_linux_rt_sigframe = |
| 52 | { |
| 53 | SIGTRAMP_FRAME, |
| 54 | 4, |
| 55 | { |
| 56 | { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */ |
| 57 | { 0x91d0206d, -1 }, /* ta 0x6d */ |
| 58 | { TRAMP_SENTINEL_INSN, -1 } |
| 59 | }, |
| 60 | sparc64_linux_sigframe_init |
| 61 | }; |
| 62 | |
| 63 | static void |
| 64 | sparc64_linux_sigframe_init (const struct tramp_frame *self, |
| 65 | struct frame_info *this_frame, |
| 66 | struct trad_frame_cache *this_cache, |
| 67 | CORE_ADDR func) |
| 68 | { |
| 69 | CORE_ADDR base, addr, sp_addr; |
| 70 | int regnum; |
| 71 | |
| 72 | base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM); |
| 73 | base += 128; |
| 74 | |
| 75 | /* Offsets from <bits/sigcontext.h>. */ |
| 76 | |
| 77 | /* Since %g0 is always zero, keep the identity encoding. */ |
| 78 | addr = base + 8; |
| 79 | sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8); |
| 80 | for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++) |
| 81 | { |
| 82 | trad_frame_set_reg_addr (this_cache, regnum, addr); |
| 83 | addr += 8; |
| 84 | } |
| 85 | |
| 86 | trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0); |
| 87 | trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8); |
| 88 | trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16); |
| 89 | trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24); |
| 90 | trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28); |
| 91 | |
| 92 | base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM); |
| 93 | if (base & 1) |
| 94 | base += BIAS; |
| 95 | |
| 96 | addr = get_frame_memory_unsigned (this_frame, sp_addr, 8); |
| 97 | if (addr & 1) |
| 98 | addr += BIAS; |
| 99 | |
| 100 | for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) |
| 101 | { |
| 102 | trad_frame_set_reg_addr (this_cache, regnum, addr); |
| 103 | addr += 8; |
| 104 | } |
| 105 | trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| 106 | } |
| 107 | \f |
| 108 | /* Return the address of a system call's alternative return |
| 109 | address. */ |
| 110 | |
| 111 | static CORE_ADDR |
| 112 | sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn) |
| 113 | { |
| 114 | /* __NR_rt_sigreturn is 101 */ |
| 115 | if ((insn == 0x91d0206d) |
| 116 | && (get_frame_register_unsigned (frame, SPARC_G1_REGNUM) == 101)) |
| 117 | { |
| 118 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 119 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 120 | |
| 121 | ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM); |
| 122 | if (sp & 1) |
| 123 | sp += BIAS; |
| 124 | |
| 125 | /* The kernel puts the sigreturn registers on the stack, |
| 126 | and this is where the signal unwinding state is take from |
| 127 | when returning from a signal. |
| 128 | |
| 129 | A siginfo_t sits 192 bytes from the base of the stack. This |
| 130 | siginfo_t is 128 bytes, and is followed by the sigreturn |
| 131 | register save area. The saved PC sits at a 136 byte offset |
| 132 | into there. */ |
| 133 | |
| 134 | return read_memory_unsigned_integer (sp + 192 + 128 + 136, |
| 135 | 8, byte_order); |
| 136 | } |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | \f |
| 141 | |
| 142 | const struct sparc_gregmap sparc64_linux_core_gregmap = |
| 143 | { |
| 144 | 32 * 8, /* %tstate */ |
| 145 | 33 * 8, /* %tpc */ |
| 146 | 34 * 8, /* %tnpc */ |
| 147 | 35 * 8, /* %y */ |
| 148 | -1, /* %wim */ |
| 149 | -1, /* %tbr */ |
| 150 | 1 * 8, /* %g1 */ |
| 151 | 16 * 8, /* %l0 */ |
| 152 | 8, /* y size */ |
| 153 | }; |
| 154 | \f |
| 155 | |
| 156 | static void |
| 157 | sparc64_linux_supply_core_gregset (const struct regset *regset, |
| 158 | struct regcache *regcache, |
| 159 | int regnum, const void *gregs, size_t len) |
| 160 | { |
| 161 | sparc64_supply_gregset (&sparc64_linux_core_gregmap, |
| 162 | regcache, regnum, gregs); |
| 163 | } |
| 164 | |
| 165 | static void |
| 166 | sparc64_linux_collect_core_gregset (const struct regset *regset, |
| 167 | const struct regcache *regcache, |
| 168 | int regnum, void *gregs, size_t len) |
| 169 | { |
| 170 | sparc64_collect_gregset (&sparc64_linux_core_gregmap, |
| 171 | regcache, regnum, gregs); |
| 172 | } |
| 173 | |
| 174 | static void |
| 175 | sparc64_linux_supply_core_fpregset (const struct regset *regset, |
| 176 | struct regcache *regcache, |
| 177 | int regnum, const void *fpregs, size_t len) |
| 178 | { |
| 179 | sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs); |
| 180 | } |
| 181 | |
| 182 | static void |
| 183 | sparc64_linux_collect_core_fpregset (const struct regset *regset, |
| 184 | const struct regcache *regcache, |
| 185 | int regnum, void *fpregs, size_t len) |
| 186 | { |
| 187 | sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs); |
| 188 | } |
| 189 | |
| 190 | /* Set the program counter for process PTID to PC. */ |
| 191 | |
| 192 | #define TSTATE_SYSCALL 0x0000000000000020ULL |
| 193 | |
| 194 | static void |
| 195 | sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 196 | { |
| 197 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); |
| 198 | ULONGEST state; |
| 199 | |
| 200 | regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc); |
| 201 | regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4); |
| 202 | |
| 203 | /* Clear the "in syscall" bit to prevent the kernel from |
| 204 | messing with the PCs we just installed, if we happen to be |
| 205 | within an interrupted system call that the kernel wants to |
| 206 | restart. |
| 207 | |
| 208 | Note that after we return from the dummy call, the TSTATE et al. |
| 209 | registers will be automatically restored, and the kernel |
| 210 | continues to restart the system call at this point. */ |
| 211 | regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state); |
| 212 | state &= ~TSTATE_SYSCALL; |
| 213 | regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state); |
| 214 | } |
| 215 | |
| 216 | static LONGEST |
| 217 | sparc64_linux_get_syscall_number (struct gdbarch *gdbarch, |
| 218 | ptid_t ptid) |
| 219 | { |
| 220 | struct regcache *regcache = get_thread_regcache (ptid); |
| 221 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 222 | /* The content of a register. */ |
| 223 | gdb_byte buf[8]; |
| 224 | /* The result. */ |
| 225 | LONGEST ret; |
| 226 | |
| 227 | /* Getting the system call number from the register. |
| 228 | When dealing with the sparc architecture, this information |
| 229 | is stored at the %g1 register. */ |
| 230 | regcache_cooked_read (regcache, SPARC_G1_REGNUM, buf); |
| 231 | |
| 232 | ret = extract_signed_integer (buf, 8, byte_order); |
| 233 | |
| 234 | return ret; |
| 235 | } |
| 236 | |
| 237 | \f |
| 238 | /* Implement the "get_longjmp_target" gdbarch method. */ |
| 239 | |
| 240 | static int |
| 241 | sparc64_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
| 242 | { |
| 243 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 244 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 245 | CORE_ADDR jb_addr; |
| 246 | gdb_byte buf[8]; |
| 247 | |
| 248 | jb_addr = get_frame_register_unsigned (frame, SPARC_O0_REGNUM); |
| 249 | |
| 250 | /* setjmp and longjmp in SPARC64 are implemented in glibc using the |
| 251 | setcontext and getcontext system calls respectively. These |
| 252 | system calls operate on ucontext_t structures, which happen to |
| 253 | partially have the same structure than jmp_buf. However the |
| 254 | ucontext returned by getcontext, and thus the jmp_buf structure |
| 255 | returned by setjmp, contains the context of the trap instruction |
| 256 | in the glibc __[sig]setjmp wrapper, not the context of the user |
| 257 | code calling setjmp. |
| 258 | |
| 259 | %o7 in the jmp_buf structure is stored at offset 18*8 in the |
| 260 | mc_gregs array, which is itself located at offset 32 into |
| 261 | jmp_buf. See bits/setjmp.h. This register contains the address |
| 262 | of the 'call setjmp' instruction in user code. |
| 263 | |
| 264 | In order to determine the longjmp target address in the |
| 265 | initiating frame we need to examine the call instruction itself, |
| 266 | in particular whether the annul bit is set. If it is not set |
| 267 | then we need to jump over the instruction at the delay slot. */ |
| 268 | |
| 269 | if (target_read_memory (jb_addr + 32 + (18 * 8), buf, 8)) |
| 270 | return 0; |
| 271 | |
| 272 | *pc = extract_unsigned_integer (buf, 8, gdbarch_byte_order (gdbarch)); |
| 273 | |
| 274 | if (!sparc_is_annulled_branch_insn (*pc)) |
| 275 | *pc += 4; /* delay slot insn */ |
| 276 | *pc += 4; /* call insn */ |
| 277 | |
| 278 | return 1; |
| 279 | } |
| 280 | |
| 281 | \f |
| 282 | |
| 283 | static const struct regset sparc64_linux_gregset = |
| 284 | { |
| 285 | NULL, |
| 286 | sparc64_linux_supply_core_gregset, |
| 287 | sparc64_linux_collect_core_gregset |
| 288 | }; |
| 289 | |
| 290 | static const struct regset sparc64_linux_fpregset = |
| 291 | { |
| 292 | NULL, |
| 293 | sparc64_linux_supply_core_fpregset, |
| 294 | sparc64_linux_collect_core_fpregset |
| 295 | }; |
| 296 | |
| 297 | static void |
| 298 | sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 299 | { |
| 300 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 301 | |
| 302 | linux_init_abi (info, gdbarch); |
| 303 | |
| 304 | tdep->gregset = &sparc64_linux_gregset; |
| 305 | tdep->sizeof_gregset = 288; |
| 306 | |
| 307 | tdep->fpregset = &sparc64_linux_fpregset; |
| 308 | tdep->sizeof_fpregset = 280; |
| 309 | |
| 310 | tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe); |
| 311 | |
| 312 | /* Hook in the DWARF CFI frame unwinder. */ |
| 313 | dwarf2_append_unwinders (gdbarch); |
| 314 | |
| 315 | sparc64_init_abi (info, gdbarch); |
| 316 | |
| 317 | /* GNU/Linux has SVR4-style shared libraries... */ |
| 318 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| 319 | set_solib_svr4_fetch_link_map_offsets |
| 320 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 321 | |
| 322 | /* ...which means that we need some special handling when doing |
| 323 | prologue analysis. */ |
| 324 | tdep->plt_entry_size = 16; |
| 325 | |
| 326 | /* Enable TLS support. */ |
| 327 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 328 | svr4_fetch_objfile_link_map); |
| 329 | |
| 330 | /* Make sure we can single-step over signal return system calls. */ |
| 331 | tdep->step_trap = sparc64_linux_step_trap; |
| 332 | |
| 333 | /* Make sure we can single-step over longjmp calls. */ |
| 334 | set_gdbarch_get_longjmp_target (gdbarch, sparc64_linux_get_longjmp_target); |
| 335 | |
| 336 | set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc); |
| 337 | |
| 338 | /* Functions for 'catch syscall'. */ |
| 339 | set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_SPARC64); |
| 340 | set_gdbarch_get_syscall_number (gdbarch, |
| 341 | sparc64_linux_get_syscall_number); |
| 342 | } |
| 343 | \f |
| 344 | |
| 345 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 346 | extern void _initialize_sparc64_linux_tdep (void); |
| 347 | |
| 348 | void |
| 349 | _initialize_sparc64_linux_tdep (void) |
| 350 | { |
| 351 | gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, |
| 352 | GDB_OSABI_LINUX, sparc64_linux_init_abi); |
| 353 | } |