1 /* Native-dependent code for DragonFly/amd64. 2 3 Copyright (C) 2003-2013 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 #include "gregset.h" 25 26 #include "gdb_assert.h" 27 #include <signal.h> 28 #include <stddef.h> 29 #include <sys/types.h> 30 #include <sys/procfs.h> 31 #include <sys/ptrace.h> 32 #include <sys/sysctl.h> 33 #include <machine/reg.h> 34 35 #include "fbsd-nat.h" 36 #include "amd64-tdep.h" 37 #include "amd64-nat.h" 38 #include "amd64bsd-nat.h" 39 #include "i386-nat.h" 40 41 42 /* Offset in `struct reg' where MEMBER is stored. */ 43 #define REG_OFFSET(member) offsetof (struct reg, member) 44 45 /* At amd64dfly64_r_reg_offset[REGNUM] you'll find the offset in 46 `struct reg' location where the GDB register REGNUM is stored. 47 Unsupported registers are marked with `-1'. */ 48 static int amd64dfly64_r_reg_offset[] = 49 { 50 REG_OFFSET (r_rax), 51 REG_OFFSET (r_rbx), 52 REG_OFFSET (r_rcx), 53 REG_OFFSET (r_rdx), 54 REG_OFFSET (r_rsi), 55 REG_OFFSET (r_rdi), 56 REG_OFFSET (r_rbp), 57 REG_OFFSET (r_rsp), 58 REG_OFFSET (r_r8), 59 REG_OFFSET (r_r9), 60 REG_OFFSET (r_r10), 61 REG_OFFSET (r_r11), 62 REG_OFFSET (r_r12), 63 REG_OFFSET (r_r13), 64 REG_OFFSET (r_r14), 65 REG_OFFSET (r_r15), 66 REG_OFFSET (r_rip), 67 REG_OFFSET (r_rflags), 68 REG_OFFSET (r_cs), 69 REG_OFFSET (r_ss), 70 -1, 71 -1, 72 -1, 73 -1 74 }; 75 76 77 /* Mapping between the general-purpose registers in DragonFly/amd64 78 `struct reg' format and GDB's register cache layout for 79 DragonFly/i386. 80 81 Note that most DragonFly/amd64 registers are 64-bit, while the 82 DragonFly/i386 registers are all 32-bit, but since we're 83 little-endian we get away with that. */ 84 85 /* From <machine/reg.h>. */ 86 static int amd64dfly32_r_reg_offset[I386_NUM_GREGS] = 87 { 88 14 * 8, 13 * 8, /* %eax, %ecx */ 89 12 * 8, 11 * 8, /* %edx, %ebx */ 90 20 * 8, 10 * 8, /* %esp, %ebp */ 91 9 * 8, 8 * 8, /* %esi, %edi */ 92 17 * 8, 19 * 8, /* %eip, %eflags */ 93 18 * 8, 21 * 8, /* %cs, %ss */ 94 -1, -1, -1, -1 /* %ds, %es, %fs, %gs */ 95 }; 96 97 98 #ifdef DFLY_PCB_SUPPLY 99 /* Transfering the registers between GDB, inferiors and core files. */ 100 101 /* Fill GDB's register array with the general-purpose register values 102 in *GREGSETP. */ 103 104 void 105 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp) 106 { 107 amd64_supply_native_gregset (regcache, gregsetp, -1); 108 } 109 110 /* Fill register REGNUM (if it is a general-purpose register) in 111 *GREGSETPS with the value in GDB's register array. If REGNUM is -1, 112 do this for all registers. */ 113 114 void 115 fill_gregset (const struct regcache *regcache, gdb_gregset_t *gregsetp, int regnum) 116 { 117 amd64_collect_native_gregset (regcache, gregsetp, regnum); 118 } 119 120 /* Fill GDB's register array with the floating-point register values 121 in *FPREGSETP. */ 122 123 void 124 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp) 125 { 126 amd64_supply_fxsave (regcache, -1, fpregsetp); 127 } 128 129 /* Fill register REGNUM (if it is a floating-point register) in 130 *FPREGSETP with the value in GDB's register array. If REGNUM is -1, 131 do this for all registers. */ 132 133 void 134 fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregsetp, int regnum) 135 { 136 amd64_collect_fxsave (regcache, regnum, fpregsetp); 137 } 138 139 /* Support for debugging kernel virtual memory images. */ 140 141 #include <sys/types.h> 142 #include <machine/pcb.h> 143 #include <osreldate.h> 144 145 #include "bsd-kvm.h" 146 147 static int 148 amd64dfly_supply_pcb (struct regcache *regcache, struct pcb *pcb) 149 { 150 /* The following is true for FreeBSD 5.2: 151 152 The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15, 153 %ds, %es, %fs and %gs. This accounts for all callee-saved 154 registers specified by the psABI and then some. Here %esp 155 contains the stack pointer at the point just after the call to 156 cpu_switch(). From this information we reconstruct the register 157 state as it would like when we just returned from cpu_switch(). */ 158 159 /* The stack pointer shouldn't be zero. */ 160 if (pcb->pcb_rsp == 0) 161 return 0; 162 163 pcb->pcb_rsp += 8; 164 regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &pcb->pcb_rip); 165 regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &pcb->pcb_rbx); 166 regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp); 167 regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp); 168 regcache_raw_supply (regcache, 12, &pcb->pcb_r12); 169 regcache_raw_supply (regcache, 13, &pcb->pcb_r13); 170 regcache_raw_supply (regcache, 14, &pcb->pcb_r14); 171 regcache_raw_supply (regcache, 15, &pcb->pcb_r15); 172 #if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075) 173 /* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only 174 up until __FreeBSD_version 800074: The removal of these fields 175 occurred on 2009-04-01 while the __FreeBSD_version number was 176 bumped to 800075 on 2009-04-06. So 800075 is the closest version 177 number where we should not try to access these fields. */ 178 regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds); 179 regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es); 180 regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs); 181 regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs); 182 #endif 183 184 return 1; 185 } 186 #endif /* DFLY_PCB_SUPPLY */ 187 188 189 static void (*super_mourn_inferior) (struct target_ops *ops); 190 191 static void 192 amd64dfly_mourn_inferior (struct target_ops *ops) 193 { 194 #ifdef HAVE_PT_GETDBREGS 195 i386_cleanup_dregs (); 196 #endif 197 super_mourn_inferior (ops); 198 } 199 200 /* Provide a prototype to silence -Wmissing-prototypes. */ 201 void _initialize_amd64dfly_nat (void); 202 203 void 204 _initialize_amd64dfly_nat (void) 205 { 206 struct target_ops *t; 207 int offset; 208 209 amd64_native_gregset32_reg_offset = amd64dfly32_r_reg_offset; 210 amd64_native_gregset64_reg_offset = amd64dfly64_r_reg_offset; 211 212 /* Add some extra features to the common *BSD/i386 target. */ 213 t = amd64bsd_target (); 214 215 #ifdef HAVE_PT_GETDBREGS 216 217 i386_use_watchpoints (t); 218 219 i386_dr_low.set_control = amd64bsd_dr_set_control; 220 i386_dr_low.set_addr = amd64bsd_dr_set_addr; 221 i386_dr_low.get_addr = amd64bsd_dr_get_addr; 222 i386_dr_low.get_status = amd64bsd_dr_get_status; 223 i386_dr_low.get_control = amd64bsd_dr_get_control; 224 i386_set_debug_register_length (8); 225 226 #endif /* HAVE_PT_GETDBREGS */ 227 228 super_mourn_inferior = t->to_mourn_inferior; 229 t->to_mourn_inferior = amd64dfly_mourn_inferior; 230 231 t->to_pid_to_exec_file = fbsd_pid_to_exec_file; 232 t->to_find_memory_regions = fbsd_find_memory_regions; 233 t->to_make_corefile_notes = fbsd_make_corefile_notes; 234 add_target (t); 235 236 #ifdef DFLY_PCB_SUPPLY 237 /* Support debugging kernel virtual memory images. */ 238 bsd_kvm_add_target (amd64dfly_supply_pcb); 239 #endif 240 241 /* To support the recognition of signal handlers, i386bsd-tdep.c 242 hardcodes some constants. Inclusion of this file means that we 243 are compiling a native debugger, which means that we can use the 244 system header files and sysctl(3) to get at the relevant 245 information. */ 246 247 #define SC_REG_OFFSET amd64dfly_sc_reg_offset 248 249 /* We only check the program counter, stack pointer and frame 250 pointer since these members of `struct sigcontext' are essential 251 for providing backtraces. */ 252 253 #define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM] 254 #define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM] 255 #define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM] 256 257 /* Override the default value for the offset of the program counter 258 in the sigcontext structure. */ 259 offset = offsetof (struct sigcontext, sc_rip); 260 261 if (SC_RIP_OFFSET != offset) 262 { 263 warning (_("\ 264 offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\ 265 Please report this to <bug-gdb@gnu.org>."), 266 offset, SC_RIP_OFFSET); 267 } 268 269 SC_RIP_OFFSET = offset; 270 271 /* Likewise for the stack pointer. */ 272 offset = offsetof (struct sigcontext, sc_rsp); 273 274 if (SC_RSP_OFFSET != offset) 275 { 276 warning (_("\ 277 offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\ 278 Please report this to <bug-gdb@gnu.org>."), 279 offset, SC_RSP_OFFSET); 280 } 281 282 SC_RSP_OFFSET = offset; 283 284 /* And the frame pointer. */ 285 offset = offsetof (struct sigcontext, sc_rbp); 286 287 if (SC_RBP_OFFSET != offset) 288 { 289 warning (_("\ 290 offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\ 291 Please report this to <bug-gdb@gnu.org>."), 292 offset, SC_RBP_OFFSET); 293 } 294 295 SC_RBP_OFFSET = offset; 296 297 /* DragonFly provides a kern.ps_strings sysctl that we can use to 298 locate the sigtramp. That way we can still recognize a sigtramp 299 if its location is changed in a new kernel. Of course this is 300 still based on the assumption that the sigtramp is placed 301 directly under the location where the program arguments and 302 environment can be found. */ 303 { 304 int mib[2]; 305 long ps_strings; 306 size_t len; 307 308 mib[0] = CTL_KERN; 309 mib[1] = KERN_PS_STRINGS; 310 len = sizeof (ps_strings); 311 if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0) 312 { 313 amd64dfly_sigtramp_start_addr = ps_strings - 32; 314 amd64dfly_sigtramp_end_addr = ps_strings; 315 } 316 } 317 } 318