| 1 | /* Target-dependent code for NetBSD/amd64. |
| 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 "arch-utils.h" |
| 22 | #include "frame.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "osabi.h" |
| 25 | #include "symtab.h" |
| 26 | |
| 27 | #include "amd64-tdep.h" |
| 28 | #include "x86-xstate.h" |
| 29 | #include "nbsd-tdep.h" |
| 30 | #include "solib-svr4.h" |
| 31 | |
| 32 | /* Support for signal handlers. */ |
| 33 | |
| 34 | /* Return whether THIS_FRAME corresponds to a NetBSD sigtramp |
| 35 | routine. */ |
| 36 | |
| 37 | static int |
| 38 | amd64nbsd_sigtramp_p (struct frame_info *this_frame) |
| 39 | { |
| 40 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 41 | const char *name; |
| 42 | |
| 43 | find_pc_partial_function (pc, &name, NULL, NULL); |
| 44 | return nbsd_pc_in_sigtramp (pc, name); |
| 45 | } |
| 46 | |
| 47 | /* Assuming THIS_FRAME corresponds to a NetBSD sigtramp routine, |
| 48 | return the address of the associated mcontext structure. */ |
| 49 | |
| 50 | static CORE_ADDR |
| 51 | amd64nbsd_mcontext_addr (struct frame_info *this_frame) |
| 52 | { |
| 53 | CORE_ADDR addr; |
| 54 | |
| 55 | /* The register %r15 points at `struct ucontext' upon entry of a |
| 56 | signal trampoline. */ |
| 57 | addr = get_frame_register_unsigned (this_frame, AMD64_R15_REGNUM); |
| 58 | |
| 59 | /* The mcontext structure lives as offset 56 in `struct ucontext'. */ |
| 60 | return addr + 56; |
| 61 | } |
| 62 | \f |
| 63 | /* NetBSD 2.0 or later. */ |
| 64 | |
| 65 | /* Mapping between the general-purpose registers in `struct reg' |
| 66 | format and GDB's register cache layout. */ |
| 67 | |
| 68 | /* From <machine/reg.h>. */ |
| 69 | int amd64nbsd_r_reg_offset[] = |
| 70 | { |
| 71 | 14 * 8, /* %rax */ |
| 72 | 13 * 8, /* %rbx */ |
| 73 | 3 * 8, /* %rcx */ |
| 74 | 2 * 8, /* %rdx */ |
| 75 | 1 * 8, /* %rsi */ |
| 76 | 0 * 8, /* %rdi */ |
| 77 | 12 * 8, /* %rbp */ |
| 78 | 24 * 8, /* %rsp */ |
| 79 | 4 * 8, /* %r8 .. */ |
| 80 | 5 * 8, |
| 81 | 6 * 8, |
| 82 | 7 * 8, |
| 83 | 8 * 8, |
| 84 | 9 * 8, |
| 85 | 10 * 8, |
| 86 | 11 * 8, /* ... %r15 */ |
| 87 | 21 * 8, /* %rip */ |
| 88 | 23 * 8, /* %eflags */ |
| 89 | 22 * 8, /* %cs */ |
| 90 | 25 * 8, /* %ss */ |
| 91 | 18 * 8, /* %ds */ |
| 92 | 17 * 8, /* %es */ |
| 93 | 16 * 8, /* %fs */ |
| 94 | 15 * 8 /* %gs */ |
| 95 | }; |
| 96 | |
| 97 | static void |
| 98 | amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 99 | { |
| 100 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 101 | |
| 102 | /* Initialize general-purpose register set details first. */ |
| 103 | tdep->gregset_reg_offset = amd64nbsd_r_reg_offset; |
| 104 | tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset); |
| 105 | tdep->sizeof_gregset = 26 * 8; |
| 106 | |
| 107 | amd64_init_abi (info, gdbarch, |
| 108 | amd64_target_description (X86_XSTATE_SSE_MASK, true)); |
| 109 | |
| 110 | tdep->jb_pc_offset = 7 * 8; |
| 111 | |
| 112 | /* NetBSD has its own convention for signal trampolines. */ |
| 113 | tdep->sigtramp_p = amd64nbsd_sigtramp_p; |
| 114 | tdep->sigcontext_addr = amd64nbsd_mcontext_addr; |
| 115 | tdep->sc_reg_offset = amd64nbsd_r_reg_offset; |
| 116 | tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset); |
| 117 | |
| 118 | /* NetBSD uses SVR4-style shared libraries. */ |
| 119 | set_solib_svr4_fetch_link_map_offsets |
| 120 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 121 | } |
| 122 | |
| 123 | void |
| 124 | _initialize_amd64nbsd_tdep (void) |
| 125 | { |
| 126 | /* The NetBSD/amd64 native dependent code makes this assumption. */ |
| 127 | gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS); |
| 128 | |
| 129 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, |
| 130 | GDB_OSABI_NETBSD, amd64nbsd_init_abi); |
| 131 | } |