/* Target-dependent code for NetBSD/amd64. Copyright (C) 2003, 2004 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "defs.h" #include "arch-utils.h" #include "frame.h" #include "gdbcore.h" #include "osabi.h" #include "symtab.h" #include "gdb_assert.h" #include "amd64-tdep.h" #include "nbsd-tdep.h" #include "solib-svr4.h" #include "trad-frame.h" #include "frame-unwind.h" /* Support for signal handlers. */ /* Return whether the frame preceding NEXT_FRAME corresponds to a NetBSD sigtramp routine. */ static int amd64nbsd_sigtramp_p (struct frame_info *next_frame) { CORE_ADDR pc = frame_pc_unwind (next_frame); char *name; find_pc_partial_function (pc, &name, NULL, NULL); return nbsd_pc_in_sigtramp (pc, name); } /* Assuming NEXT_FRAME is preceded by a frame corresponding to a NetBSD sigtramp routine, return the address of the associated mcontext structure. */ static CORE_ADDR amd64nbsd_mcontext_addr (struct frame_info *next_frame) { CORE_ADDR addr; /* The register %r15 points at `struct ucontext' upon entry of a signal trampoline. */ addr = frame_unwind_register_unsigned (next_frame, AMD64_R15_REGNUM); /* The mcontext structure lives as offset 56 in `struct ucontext'. */ return addr + 56; } /* NetBSD 2.0 or later. */ /* Mapping between the general-purpose registers in `struct reg' format and GDB's register cache layout. */ /* From . */ int amd64nbsd_r_reg_offset[] = { 14 * 8, /* %rax */ 13 * 8, /* %rbx */ 3 * 8, /* %rcx */ 2 * 8, /* %rdx */ 1 * 8, /* %rsi */ 0 * 8, /* %rdi */ 12 * 8, /* %rbp */ 24 * 8, /* %rsp */ 4 * 8, /* %r8 .. */ 5 * 8, 6 * 8, 7 * 8, 8 * 8, 9 * 8, 10 * 8, 11 * 8, /* ... %r15 */ 21 * 8, /* %rip */ 23 * 8, /* %eflags */ 22 * 8, /* %cs */ 25 * 8, /* %ss */ 18 * 8, /* %ds */ 17 * 8, /* %es */ 16 * 8, /* %fs */ 15 * 8 /* %gs */ }; /* Kernel debuging support */ static const int amd64nbsd_tf_reg_offset[] = { 18 * 8, /* %rax */ 17 * 8, /* %rbx */ 10 * 8, /* %rcx */ 2 * 8, /* %rdx */ 1 * 8, /* %rsi */ 0 * 8, /* %rdi */ 16 * 8, /* %rbp */ 28 * 8, /* %rsp */ 4 * 8, /* %r8 .. */ 5 * 8, 3 * 8, 11 * 8, 12 * 8, 13 * 8, 14 * 8, 15 * 8, /* ... %r15 */ 25 * 8, /* %rip */ 27 * 8, /* %eflags */ 26 * 8, /* %cs */ 29 * 8, /* %ss */ 22 * 8, /* %ds */ 21 * 8, /* %es */ 20 * 8, /* %fs */ 19 * 8, /* %gs */ }; static struct trad_frame_cache * amd64nbsd_trapframe_cache(struct frame_info *next_frame, void **this_cache) { struct trad_frame_cache *cache; CORE_ADDR func, sp, addr; ULONGEST cs, rip; char *name; int i; if (*this_cache) return *this_cache; cache = trad_frame_cache_zalloc (next_frame); *this_cache = cache; func = frame_func_unwind (next_frame); sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM); find_pc_partial_function (func, &name, NULL, NULL); /* There is an extra 'call' in the interrupt sequence - ignore the extra * return address */ if (name && strncmp (name, "Xintr", 5) == 0) addr = sp + 8; /* It's an interrupt frame. */ else addr = sp; for (i = 0; i < ARRAY_SIZE (amd64nbsd_tf_reg_offset); i++) { if (amd64nbsd_tf_reg_offset[i] != -1) trad_frame_set_reg_addr (cache, i, addr + amd64nbsd_tf_reg_offset[i]); /* Read %cs and %rip when we have the addresses to hand */ if (i == AMD64_CS_REGNUM) cs = read_memory_unsigned_integer (addr + amd64nbsd_tf_reg_offset[i], 8); if (i == AMD64_RIP_REGNUM) rip = read_memory_unsigned_integer (addr + amd64nbsd_tf_reg_offset[i], 8); } /* The trap frame layout was changed lf the %rip value is less than 2^16 it * is almost certainly the %ss of the old format. */ if (rip < 2^16) { for (i = 0; i < ARRAY_SIZE (amd64nbsd_tf_reg_offset); i++) { if (amd64nbsd_tf_reg_offset[i] == -1) continue; trad_frame_set_reg_addr (cache, i, addr + amd64nbsd_r_reg_offset[i]); /* Read %cs when we have the address to hand */ if (i == AMD64_CS_REGNUM) cs = read_memory_unsigned_integer (addr + amd64nbsd_r_reg_offset[i], 8); } } if ((cs & I386_SEL_RPL) == I386_SEL_UPL) { /* Trap from user space; terminate backtrace. */ trad_frame_set_id (cache, null_frame_id); } else { /* Construct the frame ID using the function start. */ trad_frame_set_id (cache, frame_id_build (sp + 16, func)); } return cache; } static void amd64nbsd_trapframe_this_id (struct frame_info *next_frame, void **this_cache, struct frame_id *this_id) { struct trad_frame_cache *cache = amd64nbsd_trapframe_cache (next_frame, this_cache); trad_frame_get_id (cache, this_id); } static void amd64nbsd_trapframe_prev_register (struct frame_info *next_frame, void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp, CORE_ADDR *addrp, int *realnump, gdb_byte *valuep) { struct trad_frame_cache *cache = amd64nbsd_trapframe_cache (next_frame, this_cache); trad_frame_get_register (cache, next_frame, regnum, optimizedp, lvalp, addrp, realnump, valuep); } static int amd64nbsd_trapframe_sniffer (const struct frame_unwind *self, struct frame_info *next_frame, void **this_prologue_cache) { ULONGEST cs; char *name; /* Check Current Privilege Level and bail out if we're not executing in kernel space. */ cs = frame_unwind_register_unsigned (next_frame, AMD64_CS_REGNUM); if ((cs & I386_SEL_RPL) == I386_SEL_UPL) return 0; find_pc_partial_function (frame_pc_unwind (next_frame), &name, NULL, NULL); return (name && ((strcmp (name, "alltraps") == 0) || (strcmp (name, "calltrap") == 0) || (strncmp (name, "Xtrap", 5) == 0) || (strcmp (name, "osyscall1") == 0) || (strcmp (name, "Xsyscall") == 0) || (strncmp (name, "Xintr", 5) == 0) || (strncmp (name, "Xresume", 7) == 0) || (strncmp (name, "Xstray", 6) == 0) || (strncmp (name, "Xrecurse", 8) == 0) || (strncmp (name, "Xsoft", 5) == 0) || (strcmp (name, "Xdoreti") == 0))); } static const struct frame_unwind amd64nbsd_trapframe_unwind = { /* FIXME: kettenis/20051219: This really is more like an interrupt frame, but SIGTRAMP_FRAME would print , which really is not what we want here. */ NORMAL_FRAME, amd64nbsd_trapframe_this_id, amd64nbsd_trapframe_prev_register, NULL, amd64nbsd_trapframe_sniffer }; static void amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* Initialize general-purpose register set details first. */ tdep->gregset_reg_offset = amd64nbsd_r_reg_offset; tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset); tdep->sizeof_gregset = 26 * 8; amd64_init_abi (info, gdbarch); tdep->jb_pc_offset = 7 * 8; /* NetBSD has its own convention for signal trampolines. */ tdep->sigtramp_p = amd64nbsd_sigtramp_p; tdep->sigcontext_addr = amd64nbsd_mcontext_addr; tdep->sc_reg_offset = amd64nbsd_r_reg_offset; tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset); /* NetBSD uses SVR4-style shared libraries. */ set_solib_svr4_fetch_link_map_offsets (gdbarch, svr4_lp64_fetch_link_map_offsets); /* Unwind kernel trap frames correctly. */ frame_unwind_prepend_unwinder (gdbarch, &amd64nbsd_trapframe_unwind); } /* Provide a prototype to silence -Wmissing-prototypes. */ void _initialize_amd64nbsd_tdep (void); void _initialize_amd64nbsd_ndep (void) { /* The NetBSD/amd64 native dependent code makes this assumption. */ gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS); gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi); }