1 /* Native-dependent code for DragonFly/amd64. 2 3 Copyright (C) 2003, 2004, 2007, 2008, 2009 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 "inferior.h" 22 #include "regcache.h" 23 #include "target.h" 24 25 #include "gdb_assert.h" 26 #include <signal.h> 27 #include <stddef.h> 28 #include <sys/types.h> 29 #include <sys/ptrace.h> 30 #include <sys/sysctl.h> 31 #include <machine/reg.h> 32 33 #include "fbsd-nat.h" 34 #include "amd64-tdep.h" 35 #include "amd64-nat.h" 36 37 38 /* Offset in `struct reg' where MEMBER is stored. */ 39 #define REG_OFFSET(member) offsetof (struct reg, member) 40 41 /* At amd64dfly64_r_reg_offset[REGNUM] you'll find the offset in 42 `struct reg' location where the GDB register REGNUM is stored. 43 Unsupported registers are marked with `-1'. */ 44 static int amd64dfly64_r_reg_offset[] = 45 { 46 REG_OFFSET (r_rax), 47 REG_OFFSET (r_rbx), 48 REG_OFFSET (r_rcx), 49 REG_OFFSET (r_rdx), 50 REG_OFFSET (r_rsi), 51 REG_OFFSET (r_rdi), 52 REG_OFFSET (r_rbp), 53 REG_OFFSET (r_rsp), 54 REG_OFFSET (r_r8), 55 REG_OFFSET (r_r9), 56 REG_OFFSET (r_r10), 57 REG_OFFSET (r_r11), 58 REG_OFFSET (r_r12), 59 REG_OFFSET (r_r13), 60 REG_OFFSET (r_r14), 61 REG_OFFSET (r_r15), 62 REG_OFFSET (r_rip), 63 REG_OFFSET (r_rflags), 64 REG_OFFSET (r_cs), 65 REG_OFFSET (r_ss), 66 -1, 67 -1, 68 -1, 69 -1 70 }; 71 72 73 /* Mapping between the general-purpose registers in DragonFly/amd64 74 `struct reg' format and GDB's register cache layout for 75 DragonFly/i386. 76 77 Note that most DragonFly/amd64 registers are 64-bit, while the 78 DragonFly/i386 registers are all 32-bit, but since we're 79 little-endian we get away with that. */ 80 81 /* From <machine/reg.h>. */ 82 static int amd64dfly32_r_reg_offset[I386_NUM_GREGS] = 83 { 84 14 * 8, 13 * 8, /* %eax, %ecx */ 85 12 * 8, 11 * 8, /* %edx, %ebx */ 86 20 * 8, 10 * 8, /* %esp, %ebp */ 87 9 * 8, 8 * 8, /* %esi, %edi */ 88 17 * 8, 19 * 8, /* %eip, %eflags */ 89 18 * 8, 21 * 8, /* %cs, %ss */ 90 -1, -1, -1, -1 /* %ds, %es, %fs, %gs */ 91 }; 92 93 94 /* Provide a prototype to silence -Wmissing-prototypes. */ 95 void _initialize_amd64dfly_nat (void); 96 97 void 98 _initialize_amd64dfly_nat (void) 99 { 100 struct target_ops *t; 101 int offset; 102 103 amd64_native_gregset32_reg_offset = amd64dfly32_r_reg_offset; 104 amd64_native_gregset64_reg_offset = amd64dfly64_r_reg_offset; 105 106 /* Add some extra features to the common *BSD/i386 target. */ 107 t = amd64bsd_target (); 108 t->to_pid_to_exec_file = fbsd_pid_to_exec_file; 109 t->to_find_memory_regions = fbsd_find_memory_regions; 110 t->to_make_corefile_notes = fbsd_make_corefile_notes; 111 add_target (t); 112 113 /* To support the recognition of signal handlers, i386bsd-tdep.c 114 hardcodes some constants. Inclusion of this file means that we 115 are compiling a native debugger, which means that we can use the 116 system header files and sysctl(3) to get at the relevant 117 information. */ 118 119 #define SC_REG_OFFSET amd64dfly_sc_reg_offset 120 121 /* We only check the program counter, stack pointer and frame 122 pointer since these members of `struct sigcontext' are essential 123 for providing backtraces. */ 124 125 #define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM] 126 #define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM] 127 #define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM] 128 129 /* Override the default value for the offset of the program counter 130 in the sigcontext structure. */ 131 offset = offsetof (struct sigcontext, sc_rip); 132 133 if (SC_RIP_OFFSET != offset) 134 { 135 warning (_("\ 136 offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\ 137 Please report this to <bug-gdb@gnu.org>."), 138 offset, SC_RIP_OFFSET); 139 } 140 141 SC_RIP_OFFSET = offset; 142 143 /* Likewise for the stack pointer. */ 144 offset = offsetof (struct sigcontext, sc_rsp); 145 146 if (SC_RSP_OFFSET != offset) 147 { 148 warning (_("\ 149 offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\ 150 Please report this to <bug-gdb@gnu.org>."), 151 offset, SC_RSP_OFFSET); 152 } 153 154 SC_RSP_OFFSET = offset; 155 156 /* And the frame pointer. */ 157 offset = offsetof (struct sigcontext, sc_rbp); 158 159 if (SC_RBP_OFFSET != offset) 160 { 161 warning (_("\ 162 offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\ 163 Please report this to <bug-gdb@gnu.org>."), 164 offset, SC_RBP_OFFSET); 165 } 166 167 SC_RBP_OFFSET = offset; 168 169 /* DragonFly provides a kern.ps_strings sysctl that we can use to 170 locate the sigtramp. That way we can still recognize a sigtramp 171 if its location is changed in a new kernel. Of course this is 172 still based on the assumption that the sigtramp is placed 173 directly under the location where the program arguments and 174 environment can be found. */ 175 { 176 int mib[2]; 177 long ps_strings; 178 size_t len; 179 180 mib[0] = CTL_KERN; 181 mib[1] = KERN_PS_STRINGS; 182 len = sizeof (ps_strings); 183 if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0) 184 { 185 amd64dfly_sigtramp_start_addr = ps_strings - 32; 186 amd64dfly_sigtramp_end_addr = ps_strings; 187 } 188 } 189 } 190