1 /* Target-dependent code for Solaris x86. 2 3 Copyright (C) 2002-2016 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 "value.h" 22 #include "osabi.h" 23 24 #include "sol2-tdep.h" 25 #include "i386-tdep.h" 26 #include "solib-svr4.h" 27 28 /* From <ia32/sys/reg.h>. */ 29 static int i386_sol2_gregset_reg_offset[] = 30 { 31 11 * 4, /* %eax */ 32 10 * 4, /* %ecx */ 33 9 * 4, /* %edx */ 34 8 * 4, /* %ebx */ 35 17 * 4, /* %esp */ 36 6 * 4, /* %ebp */ 37 5 * 4, /* %esi */ 38 4 * 4, /* %edi */ 39 14 * 4, /* %eip */ 40 16 * 4, /* %eflags */ 41 15 * 4, /* %cs */ 42 18 * 4, /* %ss */ 43 3 * 4, /* %ds */ 44 2 * 4, /* %es */ 45 1 * 4, /* %fs */ 46 0 * 4 /* %gs */ 47 }; 48 49 /* Return whether THIS_FRAME corresponds to a Solaris sigtramp 50 routine. */ 51 52 static int 53 i386_sol2_sigtramp_p (struct frame_info *this_frame) 54 { 55 CORE_ADDR pc = get_frame_pc (this_frame); 56 const char *name; 57 58 find_pc_partial_function (pc, &name, NULL, NULL); 59 return (name && (strcmp ("sigacthandler", name) == 0 60 || strcmp (name, "ucbsigvechandler") == 0)); 61 } 62 63 /* Solaris doesn't have a `struct sigcontext', but it does have a 64 `mcontext_t' that contains the saved set of machine registers. */ 65 66 static CORE_ADDR 67 i386_sol2_mcontext_addr (struct frame_info *this_frame) 68 { 69 CORE_ADDR sp, ucontext_addr; 70 71 sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM); 72 ucontext_addr = get_frame_memory_unsigned (this_frame, sp + 8, 4); 73 74 return ucontext_addr + 36; 75 } 76 77 /* SunPRO encodes the static variables. This is not related to C++ 78 mangling, it is done for C too. */ 79 80 static const char * 81 i386_sol2_static_transform_name (const char *name) 82 { 83 if (name[0] == '.') 84 { 85 const char *p; 86 87 /* For file-local statics there will be a period, a bunch of 88 junk (the contents of which match a string given in the 89 N_OPT), a period and the name. For function-local statics 90 there will be a bunch of junk (which seems to change the 91 second character from 'A' to 'B'), a period, the name of the 92 function, and the name. So just skip everything before the 93 last period. */ 94 p = strrchr (name, '.'); 95 if (p != NULL) 96 name = p + 1; 97 } 98 return name; 99 } 100 101 /* Solaris 2. */ 102 103 static void 104 i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 105 { 106 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 107 108 /* Solaris is SVR4-based. */ 109 i386_svr4_init_abi (info, gdbarch); 110 111 /* The SunPRO compiler puts out 0 instead of the address in N_SO symbols, 112 and for SunPRO 3.0, N_FUN symbols too. */ 113 set_gdbarch_sofun_address_maybe_missing (gdbarch, 1); 114 115 /* Handle SunPRO encoding of static symbols. */ 116 set_gdbarch_static_transform_name (gdbarch, i386_sol2_static_transform_name); 117 118 /* Solaris reserves space for its FPU emulator in `fpregset_t'. 119 There is also some space reserved for the registers of a Weitek 120 math coprocessor. */ 121 tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset; 122 tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset); 123 tdep->sizeof_gregset = 19 * 4; 124 tdep->sizeof_fpregset = 380; 125 126 /* Signal trampolines are slightly different from SVR4. */ 127 tdep->sigtramp_p = i386_sol2_sigtramp_p; 128 tdep->sigcontext_addr = i386_sol2_mcontext_addr; 129 tdep->sc_reg_offset = tdep->gregset_reg_offset; 130 tdep->sc_num_regs = tdep->gregset_num_regs; 131 132 /* Solaris has SVR4-style shared libraries. */ 133 set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver); 134 set_solib_svr4_fetch_link_map_offsets 135 (gdbarch, svr4_ilp32_fetch_link_map_offsets); 136 137 /* How to print LWP PTIDs from core files. */ 138 set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str); 139 } 140 141 142 static enum gdb_osabi 143 i386_sol2_osabi_sniffer (bfd *abfd) 144 { 145 /* If we have a section named .SUNW_version, then it is almost 146 certainly Solaris 2. */ 147 if (bfd_get_section_by_name (abfd, ".SUNW_version")) 148 return GDB_OSABI_SOLARIS; 149 150 return GDB_OSABI_UNKNOWN; 151 } 152 153 /* Provide a prototype to silence -Wmissing-prototypes. */ 154 void _initialize_i386_sol2_tdep (void); 155 156 void 157 _initialize_i386_sol2_tdep (void) 158 { 159 /* Register an ELF OS ABI sniffer for Solaris 2 binaries. */ 160 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour, 161 i386_sol2_osabi_sniffer); 162 163 gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS, 164 i386_sol2_init_abi); 165 } 166