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 /* Work around vkernels not having PT_{GET,SET}DBREGS via ptrace(2) support. */ 192 static int 193 is_vkernel(void) 194 { 195 size_t len; 196 char buf[64]; 197 198 len = sizeof(buf); 199 if (sysctlbyname("kern.vmm_guest", buf, &len, NULL, 0) < 0) 200 return 0; 201 if (strncmp("vkernel", buf, len) == 0) 202 return 1; 203 else 204 return 0; 205 } 206 207 static void 208 amd64dfly_mourn_inferior (struct target_ops *ops) 209 { 210 #ifdef HAVE_PT_GETDBREGS 211 if (!is_vkernel()) 212 i386_cleanup_dregs (); 213 #endif 214 super_mourn_inferior (ops); 215 } 216 217 /* Provide a prototype to silence -Wmissing-prototypes. */ 218 void _initialize_amd64dfly_nat (void); 219 220 void 221 _initialize_amd64dfly_nat (void) 222 { 223 struct target_ops *t; 224 int offset; 225 226 amd64_native_gregset32_reg_offset = amd64dfly32_r_reg_offset; 227 amd64_native_gregset64_reg_offset = amd64dfly64_r_reg_offset; 228 229 /* Add some extra features to the common *BSD/i386 target. */ 230 t = amd64bsd_target (); 231 232 #ifdef HAVE_PT_GETDBREGS 233 234 if (!is_vkernel()) { 235 i386_use_watchpoints (t); 236 237 i386_dr_low.set_control = amd64bsd_dr_set_control; 238 i386_dr_low.set_addr = amd64bsd_dr_set_addr; 239 i386_dr_low.get_addr = amd64bsd_dr_get_addr; 240 i386_dr_low.get_status = amd64bsd_dr_get_status; 241 i386_dr_low.get_control = amd64bsd_dr_get_control; 242 i386_set_debug_register_length (8); 243 } 244 245 #endif /* HAVE_PT_GETDBREGS */ 246 247 super_mourn_inferior = t->to_mourn_inferior; 248 t->to_mourn_inferior = amd64dfly_mourn_inferior; 249 250 t->to_pid_to_exec_file = fbsd_pid_to_exec_file; 251 t->to_find_memory_regions = fbsd_find_memory_regions; 252 t->to_make_corefile_notes = fbsd_make_corefile_notes; 253 add_target (t); 254 255 #ifdef DFLY_PCB_SUPPLY 256 /* Support debugging kernel virtual memory images. */ 257 bsd_kvm_add_target (amd64dfly_supply_pcb); 258 #endif 259 260 /* To support the recognition of signal handlers, i386bsd-tdep.c 261 hardcodes some constants. Inclusion of this file means that we 262 are compiling a native debugger, which means that we can use the 263 system header files and sysctl(3) to get at the relevant 264 information. */ 265 266 #define SC_REG_OFFSET amd64dfly_sc_reg_offset 267 268 /* We only check the program counter, stack pointer and frame 269 pointer since these members of `struct sigcontext' are essential 270 for providing backtraces. */ 271 272 #define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM] 273 #define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM] 274 #define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM] 275 276 /* Override the default value for the offset of the program counter 277 in the sigcontext structure. */ 278 offset = offsetof (struct sigcontext, sc_rip); 279 280 if (SC_RIP_OFFSET != offset) 281 { 282 warning (_("\ 283 offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\ 284 Please report this to <bug-gdb@gnu.org>."), 285 offset, SC_RIP_OFFSET); 286 } 287 288 SC_RIP_OFFSET = offset; 289 290 /* Likewise for the stack pointer. */ 291 offset = offsetof (struct sigcontext, sc_rsp); 292 293 if (SC_RSP_OFFSET != offset) 294 { 295 warning (_("\ 296 offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\ 297 Please report this to <bug-gdb@gnu.org>."), 298 offset, SC_RSP_OFFSET); 299 } 300 301 SC_RSP_OFFSET = offset; 302 303 /* And the frame pointer. */ 304 offset = offsetof (struct sigcontext, sc_rbp); 305 306 if (SC_RBP_OFFSET != offset) 307 { 308 warning (_("\ 309 offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\ 310 Please report this to <bug-gdb@gnu.org>."), 311 offset, SC_RBP_OFFSET); 312 } 313 314 SC_RBP_OFFSET = offset; 315 316 /* DragonFly provides a kern.ps_strings sysctl that we can use to 317 locate the sigtramp. That way we can still recognize a sigtramp 318 if its location is changed in a new kernel. Of course this is 319 still based on the assumption that the sigtramp is placed 320 directly under the location where the program arguments and 321 environment can be found. */ 322 { 323 int mib[2]; 324 long ps_strings; 325 size_t len; 326 327 mib[0] = CTL_KERN; 328 mib[1] = KERN_PS_STRINGS; 329 len = sizeof (ps_strings); 330 if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0) 331 { 332 amd64dfly_sigtramp_start_addr = ps_strings - 32; 333 amd64dfly_sigtramp_end_addr = ps_strings; 334 } 335 } 336 } 337