| 1 | /* Target-dependent code for Solaris x86. |
| 2 | |
| 3 | Copyright (C) 2002-2020 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 | || strcmp (name, "__sighndlr") == 0)); |
| 62 | } |
| 63 | |
| 64 | /* Solaris doesn't have a `struct sigcontext', but it does have a |
| 65 | `mcontext_t' that contains the saved set of machine registers. */ |
| 66 | |
| 67 | static CORE_ADDR |
| 68 | i386_sol2_mcontext_addr (struct frame_info *this_frame) |
| 69 | { |
| 70 | CORE_ADDR sp, ucontext_addr; |
| 71 | |
| 72 | sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM); |
| 73 | ucontext_addr = get_frame_memory_unsigned (this_frame, sp + 8, 4); |
| 74 | |
| 75 | return ucontext_addr + 36; |
| 76 | } |
| 77 | |
| 78 | /* SunPRO encodes the static variables. This is not related to C++ |
| 79 | mangling, it is done for C too. */ |
| 80 | |
| 81 | static const char * |
| 82 | i386_sol2_static_transform_name (const char *name) |
| 83 | { |
| 84 | if (name[0] == '.') |
| 85 | { |
| 86 | const char *p; |
| 87 | |
| 88 | /* For file-local statics there will be a period, a bunch of |
| 89 | junk (the contents of which match a string given in the |
| 90 | N_OPT), a period and the name. For function-local statics |
| 91 | there will be a bunch of junk (which seems to change the |
| 92 | second character from 'A' to 'B'), a period, the name of the |
| 93 | function, and the name. So just skip everything before the |
| 94 | last period. */ |
| 95 | p = strrchr (name, '.'); |
| 96 | if (p != NULL) |
| 97 | name = p + 1; |
| 98 | } |
| 99 | return name; |
| 100 | } |
| 101 | |
| 102 | /* Solaris 2. */ |
| 103 | |
| 104 | static void |
| 105 | i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 106 | { |
| 107 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 108 | |
| 109 | /* Solaris is SVR4-based. */ |
| 110 | i386_svr4_init_abi (info, gdbarch); |
| 111 | |
| 112 | /* The SunPRO compiler puts out 0 instead of the address in N_SO symbols, |
| 113 | and for SunPRO 3.0, N_FUN symbols too. */ |
| 114 | set_gdbarch_sofun_address_maybe_missing (gdbarch, 1); |
| 115 | |
| 116 | /* Handle SunPRO encoding of static symbols. */ |
| 117 | set_gdbarch_static_transform_name (gdbarch, i386_sol2_static_transform_name); |
| 118 | |
| 119 | /* Solaris reserves space for its FPU emulator in `fpregset_t'. |
| 120 | There is also some space reserved for the registers of a Weitek |
| 121 | math coprocessor. */ |
| 122 | tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset; |
| 123 | tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset); |
| 124 | tdep->sizeof_gregset = 19 * 4; |
| 125 | tdep->sizeof_fpregset = 380; |
| 126 | |
| 127 | /* Signal trampolines are slightly different from SVR4. */ |
| 128 | tdep->sigtramp_p = i386_sol2_sigtramp_p; |
| 129 | tdep->sigcontext_addr = i386_sol2_mcontext_addr; |
| 130 | tdep->sc_reg_offset = tdep->gregset_reg_offset; |
| 131 | tdep->sc_num_regs = tdep->gregset_num_regs; |
| 132 | |
| 133 | /* Solaris has SVR4-style shared libraries. */ |
| 134 | set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver); |
| 135 | set_solib_svr4_fetch_link_map_offsets |
| 136 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 137 | |
| 138 | /* How to print LWP PTIDs from core files. */ |
| 139 | set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str); |
| 140 | } |
| 141 | \f |
| 142 | |
| 143 | static enum gdb_osabi |
| 144 | i386_sol2_osabi_sniffer (bfd *abfd) |
| 145 | { |
| 146 | /* If we have a section named .SUNW_version, then it is almost |
| 147 | certainly Solaris 2. */ |
| 148 | if (bfd_get_section_by_name (abfd, ".SUNW_version")) |
| 149 | return GDB_OSABI_SOLARIS; |
| 150 | |
| 151 | return GDB_OSABI_UNKNOWN; |
| 152 | } |
| 153 | |
| 154 | void |
| 155 | _initialize_i386_sol2_tdep (void) |
| 156 | { |
| 157 | /* Register an ELF OS ABI sniffer for Solaris 2 binaries. */ |
| 158 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour, |
| 159 | i386_sol2_osabi_sniffer); |
| 160 | |
| 161 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS, |
| 162 | i386_sol2_init_abi); |
| 163 | } |