1130803Smarcel/* Target-dependent code for OpenBSD/amd64. 2130803Smarcel 3130803Smarcel Copyright 2003, 2004 Free Software Foundation, Inc. 4130803Smarcel 5130803Smarcel This file is part of GDB. 6130803Smarcel 7130803Smarcel This program is free software; you can redistribute it and/or modify 8130803Smarcel it under the terms of the GNU General Public License as published by 9130803Smarcel the Free Software Foundation; either version 2 of the License, or 10130803Smarcel (at your option) any later version. 11130803Smarcel 12130803Smarcel This program is distributed in the hope that it will be useful, 13130803Smarcel but WITHOUT ANY WARRANTY; without even the implied warranty of 14130803Smarcel MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15130803Smarcel GNU General Public License for more details. 16130803Smarcel 17130803Smarcel You should have received a copy of the GNU General Public License 18130803Smarcel along with this program; if not, write to the Free Software 19130803Smarcel Foundation, Inc., 59 Temple Place - Suite 330, 20130803Smarcel Boston, MA 02111-1307, USA. */ 21130803Smarcel 22130803Smarcel#include "defs.h" 23130803Smarcel#include "frame.h" 24130803Smarcel#include "gdbcore.h" 25130803Smarcel#include "osabi.h" 26130803Smarcel#include "regset.h" 27130803Smarcel#include "target.h" 28130803Smarcel 29130803Smarcel#include "gdb_assert.h" 30130803Smarcel#include "gdb_string.h" 31130803Smarcel 32130803Smarcel#include "amd64-tdep.h" 33130803Smarcel#include "i387-tdep.h" 34130803Smarcel#include "solib-svr4.h" 35130803Smarcel 36130803Smarcel/* Support for core dumps. */ 37130803Smarcel 38130803Smarcelstatic void 39130803Smarcelamd64obsd_supply_regset (const struct regset *regset, 40130803Smarcel struct regcache *regcache, int regnum, 41130803Smarcel const void *regs, size_t len) 42130803Smarcel{ 43130803Smarcel const struct gdbarch_tdep *tdep = regset->descr; 44130803Smarcel 45130803Smarcel gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE); 46130803Smarcel 47130803Smarcel i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset); 48130803Smarcel amd64_supply_fxsave (regcache, regnum, (char *)regs + tdep->sizeof_gregset); 49130803Smarcel} 50130803Smarcel 51130803Smarcelstatic const struct regset * 52130803Smarcelamd64obsd_regset_from_core_section (struct gdbarch *gdbarch, 53130803Smarcel const char *sect_name, size_t sect_size) 54130803Smarcel{ 55130803Smarcel struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 56130803Smarcel 57130803Smarcel /* OpenBSD core dumps don't use seperate register sets for the 58130803Smarcel general-purpose and floating-point registers. */ 59130803Smarcel 60130803Smarcel if (strcmp (sect_name, ".reg") == 0 61130803Smarcel && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE) 62130803Smarcel { 63130803Smarcel if (tdep->gregset == NULL) 64130803Smarcel { 65130803Smarcel tdep->gregset = XMALLOC (struct regset); 66130803Smarcel tdep->gregset->descr = tdep; 67130803Smarcel tdep->gregset->supply_regset = amd64obsd_supply_regset; 68130803Smarcel } 69130803Smarcel return tdep->gregset; 70130803Smarcel } 71130803Smarcel 72130803Smarcel return NULL; 73130803Smarcel} 74130803Smarcel 75130803Smarcel 76130803Smarcel/* Support for signal handlers. */ 77130803Smarcel 78130803Smarcelstatic const int amd64obsd_page_size = 4096; 79130803Smarcel 80130803Smarcelstatic int 81130803Smarcelamd64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name) 82130803Smarcel{ 83130803Smarcel CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1)); 84130803Smarcel const char sigreturn[] = 85130803Smarcel { 86130803Smarcel 0x48, 0xc7, 0xc0, 87130803Smarcel 0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */ 88130803Smarcel 0xcd, 0x80 /* int $0x80 */ 89130803Smarcel }; 90130803Smarcel char *buf; 91130803Smarcel 92130803Smarcel if (name) 93130803Smarcel return 0; 94130803Smarcel 95130803Smarcel /* If we can't read the instructions at START_PC, return zero. */ 96130803Smarcel buf = alloca (sizeof sigreturn); 97130803Smarcel if (target_read_memory (start_pc + 0x7, buf, sizeof sigreturn)) 98130803Smarcel return 0; 99130803Smarcel 100130803Smarcel /* Check for sigreturn(2). */ 101130803Smarcel if (memcmp (buf, sigreturn, sizeof sigreturn)) 102130803Smarcel return 0; 103130803Smarcel 104130803Smarcel return 1; 105130803Smarcel} 106130803Smarcel 107130803Smarcel/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp 108130803Smarcel routine, return the address of the associated sigcontext structure. */ 109130803Smarcel 110130803Smarcelstatic CORE_ADDR 111130803Smarcelamd64obsd_sigcontext_addr (struct frame_info *next_frame) 112130803Smarcel{ 113130803Smarcel /* The %rsp register points at `struct sigcontext' upon entry of a 114130803Smarcel signal trampoline. */ 115130803Smarcel return frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM); 116130803Smarcel} 117130803Smarcel 118130803Smarcel/* OpenBSD 3.5 or later. */ 119130803Smarcel 120130803Smarcel/* Mapping between the general-purpose registers in `struct reg' 121130803Smarcel format and GDB's register cache layout. */ 122130803Smarcel 123130803Smarcel/* From <machine/reg.h>. */ 124130803Smarcelint amd64obsd_r_reg_offset[] = 125130803Smarcel{ 126130803Smarcel 14 * 8, /* %rax */ 127130803Smarcel 13 * 8, /* %rbx */ 128130803Smarcel 3 * 8, /* %rcx */ 129130803Smarcel 2 * 8, /* %rdx */ 130130803Smarcel 1 * 8, /* %rsi */ 131130803Smarcel 0 * 8, /* %rdi */ 132130803Smarcel 12 * 8, /* %rbp */ 133130803Smarcel 15 * 8, /* %rsp */ 134130803Smarcel 4 * 8, /* %r8 .. */ 135130803Smarcel 5 * 8, 136130803Smarcel 6 * 8, 137130803Smarcel 7 * 8, 138130803Smarcel 8 * 8, 139130803Smarcel 9 * 8, 140130803Smarcel 10 * 8, 141130803Smarcel 11 * 8, /* ... %r15 */ 142130803Smarcel 16 * 8, /* %rip */ 143130803Smarcel 17 * 8, /* %eflags */ 144130803Smarcel 18 * 8, /* %cs */ 145130803Smarcel 19 * 8, /* %ss */ 146130803Smarcel 20 * 8, /* %ds */ 147130803Smarcel 21 * 8, /* %es */ 148130803Smarcel 22 * 8, /* %fs */ 149130803Smarcel 23 * 8 /* %gs */ 150130803Smarcel}; 151130803Smarcel 152130803Smarcel/* From <machine/signal.h>. */ 153130803Smarcelstatic int amd64obsd_sc_reg_offset[] = 154130803Smarcel{ 155130803Smarcel 14 * 8, /* %rax */ 156130803Smarcel 13 * 8, /* %rbx */ 157130803Smarcel 3 * 8, /* %rcx */ 158130803Smarcel 2 * 8, /* %rdx */ 159130803Smarcel 1 * 8, /* %rsi */ 160130803Smarcel 0 * 8, /* %rdi */ 161130803Smarcel 12 * 8, /* %rbp */ 162130803Smarcel 24 * 8, /* %rsp */ 163130803Smarcel 4 * 8, /* %r8 ... */ 164130803Smarcel 5 * 8, 165130803Smarcel 6 * 8, 166130803Smarcel 7 * 8, 167130803Smarcel 8 * 8, 168130803Smarcel 9 * 8, 169130803Smarcel 10 * 8, 170130803Smarcel 11 * 8, /* ... %r15 */ 171130803Smarcel 21 * 8, /* %rip */ 172130803Smarcel 23 * 8, /* %eflags */ 173130803Smarcel 22 * 8, /* %cs */ 174130803Smarcel 25 * 8, /* %ss */ 175130803Smarcel 18 * 8, /* %ds */ 176130803Smarcel 17 * 8, /* %es */ 177130803Smarcel 16 * 8, /* %fs */ 178130803Smarcel 15 * 8 /* %gs */ 179130803Smarcel}; 180130803Smarcel 181130803Smarcelstatic void 182130803Smarcelamd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 183130803Smarcel{ 184130803Smarcel struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 185130803Smarcel 186130803Smarcel amd64_init_abi (info, gdbarch); 187130803Smarcel 188130803Smarcel /* Initialize general-purpose register set details. */ 189130803Smarcel tdep->gregset_reg_offset = amd64obsd_r_reg_offset; 190130803Smarcel tdep->gregset_num_regs = ARRAY_SIZE (amd64obsd_r_reg_offset); 191130803Smarcel tdep->sizeof_gregset = 24 * 8; 192130803Smarcel 193130803Smarcel set_gdbarch_regset_from_core_section (gdbarch, 194130803Smarcel amd64obsd_regset_from_core_section); 195130803Smarcel 196130803Smarcel tdep->jb_pc_offset = 7 * 8; 197130803Smarcel 198130803Smarcel set_gdbarch_pc_in_sigtramp (gdbarch, amd64obsd_pc_in_sigtramp); 199130803Smarcel tdep->sigcontext_addr = amd64obsd_sigcontext_addr; 200130803Smarcel tdep->sc_reg_offset = amd64obsd_sc_reg_offset; 201130803Smarcel tdep->sc_num_regs = ARRAY_SIZE (amd64obsd_sc_reg_offset); 202130803Smarcel 203130803Smarcel /* OpenBSD uses SVR4-style shared libraries. */ 204130803Smarcel set_solib_svr4_fetch_link_map_offsets 205130803Smarcel (gdbarch, svr4_lp64_fetch_link_map_offsets); 206130803Smarcel} 207130803Smarcel 208130803Smarcel 209130803Smarcel/* Provide a prototype to silence -Wmissing-prototypes. */ 210130803Smarcelvoid _initialize_amd64obsd_tdep (void); 211130803Smarcel 212130803Smarcelvoid 213130803Smarcel_initialize_amd64obsd_tdep (void) 214130803Smarcel{ 215130803Smarcel /* The OpenBSD/amd64 native dependent code makes this assumption. */ 216130803Smarcel gdb_assert (ARRAY_SIZE (amd64obsd_r_reg_offset) == AMD64_NUM_GREGS); 217130803Smarcel 218130803Smarcel gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, 219130803Smarcel GDB_OSABI_OPENBSD_ELF, amd64obsd_init_abi); 220130803Smarcel 221130803Smarcel /* OpenBSD uses traditional (a.out) NetBSD-style core dumps. */ 222130803Smarcel gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, 223130803Smarcel GDB_OSABI_NETBSD_AOUT, amd64obsd_init_abi); 224130803Smarcel} 225