/* Target-dependent code for NetBSD/i386. Copyright (C) 1988-2017 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 3 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, see . */ #include "defs.h" #include "arch-utils.h" #include "frame.h" #include "gdbcore.h" #include "regcache.h" #include "regset.h" #include "osabi.h" #include "symtab.h" #include "trad-frame.h" #include "tramp-frame.h" #include "i386-tdep.h" #include "i387-tdep.h" #include "nbsd-tdep.h" #include "solib-svr4.h" /* From . */ static int i386nbsd_r_reg_offset[] = { 0 * 4, /* %eax */ 1 * 4, /* %ecx */ 2 * 4, /* %edx */ 3 * 4, /* %ebx */ 4 * 4, /* %esp */ 5 * 4, /* %ebp */ 6 * 4, /* %esi */ 7 * 4, /* %edi */ 8 * 4, /* %eip */ 9 * 4, /* %eflags */ 10 * 4, /* %cs */ 11 * 4, /* %ss */ 12 * 4, /* %ds */ 13 * 4, /* %es */ 14 * 4, /* %fs */ 15 * 4 /* %gs */ }; /* From . */ int i386nbsd_sc_reg_offset[] = { 10 * 4, /* %eax */ 9 * 4, /* %ecx */ 8 * 4, /* %edx */ 7 * 4, /* %ebx */ 14 * 4, /* %esp */ 6 * 4, /* %ebp */ 5 * 4, /* %esi */ 4 * 4, /* %edi */ 11 * 4, /* %eip */ 13 * 4, /* %eflags */ 12 * 4, /* %cs */ 15 * 4, /* %ss */ 3 * 4, /* %ds */ 2 * 4, /* %es */ 1 * 4, /* %fs */ 0 * 4 /* %gs */ }; /* From . */ int i386nbsd_mc_reg_offset[] = { 11 * 4, /* %eax */ 10 * 4, /* %ecx */ 9 * 4, /* %edx */ 8 * 4, /* %ebx */ 7 * 4, /* %esp */ 6 * 4, /* %ebp */ 5 * 4, /* %esi */ 4 * 4, /* %edi */ 14 * 4, /* %eip */ 16 * 4, /* %eflags */ 15 * 4, /* %cs */ 18 * 4, /* %ss */ 3 * 4, /* %ds */ 2 * 4, /* %es */ 1 * 4, /* %fs */ 0 * 4 /* %gs */ }; static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *, struct frame_info *, struct trad_frame_cache *, CORE_ADDR); static const struct tramp_frame i386nbsd_sigtramp_sc16 = { SIGTRAMP_FRAME, 1, { { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x10, -1 }, /* leal 0x10(%esp), %eax */ { 0x50, -1 }, /* pushl %eax */ { 0x50, -1 }, /* pushl %eax */ { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 }, /* movl $0x127, %eax # __sigreturn14 */ { 0xcd, -1 }, { 0x80, -1}, /* int $0x80 */ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 }, /* movl $0x1, %eax # exit */ { 0xcd, -1 }, { 0x80, -1}, /* int $0x80 */ { TRAMP_SENTINEL_INSN, -1 } }, i386nbsd_sigtramp_cache_init }; static const struct tramp_frame i386nbsd_sigtramp_sc2 = { SIGTRAMP_FRAME, 1, { { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x0c, -1 }, /* leal 0x0c(%esp), %eax */ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 }, /* movl %eax, 0x4(%esp) */ { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 }, /* movl $0x127, %eax # __sigreturn14 */ { 0xcd, -1 }, { 0x80, -1}, /* int $0x80 */ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 }, /* movl %eax, 0x4(%esp) */ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 }, /* movl $0x1, %eax */ { 0xcd, -1 }, { 0x80, -1}, /* int $0x80 */ { TRAMP_SENTINEL_INSN, -1 } }, i386nbsd_sigtramp_cache_init }; static const struct tramp_frame i386nbsd_sigtramp_si2 = { SIGTRAMP_FRAME, 1, { { 0x8b, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x08, -1 }, /* movl 8(%esp),%eax */ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 }, /* movl %eax, 0x4(%esp) */ { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, /* movl $0x134, %eax # setcontext */ { 0xcd, -1 }, { 0x80, -1 }, /* int $0x80 */ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 }, /* movl %eax, 0x4(%esp) */ { 0xb8, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 }, /* movl $0x1, %eax */ { 0xcd, -1 }, { 0x80, -1 }, /* int $0x80 */ { TRAMP_SENTINEL_INSN, -1 } }, i386nbsd_sigtramp_cache_init }; static const struct tramp_frame i386nbsd_sigtramp_si31 = { SIGTRAMP_FRAME, 1, { { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 }, { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 }, /* leal 0x8c(%esp), %eax */ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 }, /* movl %eax, 0x4(%esp) */ { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, /* movl $0x134, %eax # setcontext */ { 0xcd, -1 }, { 0x80, -1}, /* int $0x80 */ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 }, /* movl %eax, 0x4(%esp) */ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 }, /* movl $0x1, %eax */ { 0xcd, -1 }, { 0x80, -1}, /* int $0x80 */ { TRAMP_SENTINEL_INSN, -1 } }, i386nbsd_sigtramp_cache_init }; static const struct tramp_frame i386nbsd_sigtramp_si4 = { SIGTRAMP_FRAME, 1, { { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 }, { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 }, /* leal 0x8c(%esp), %eax */ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 }, /* movl %eax, 0x4(%esp) */ { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, /* movl $0x134, %eax # setcontext */ { 0xcd, -1 }, { 0x80, -1}, /* int $0x80 */ { 0xc7, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, /* movl $0xffffffff,0x4(%esp) */ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 }, /* movl $0x1, %eax */ { 0xcd, -1 }, { 0x80, -1}, /* int $0x80 */ { TRAMP_SENTINEL_INSN, -1 } }, i386nbsd_sigtramp_cache_init }; static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *self, struct frame_info *this_frame, struct trad_frame_cache *this_cache, CORE_ADDR func) { struct gdbarch *gdbarch = get_frame_arch (this_frame); enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM); CORE_ADDR base; int *reg_offset; int num_regs; int i; if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2) { reg_offset = i386nbsd_sc_reg_offset; num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset); /* Read in the sigcontext address. */ base = read_memory_unsigned_integer (sp + 8, 4, byte_order); } else { reg_offset = i386nbsd_mc_reg_offset; num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset); /* Read in the ucontext address. */ base = read_memory_unsigned_integer (sp + 8, 4, byte_order); /* offsetof(ucontext_t, uc_mcontext) == 36 */ base += 36; } for (i = 0; i < num_regs; i++) if (reg_offset[i] != -1) trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]); /* Construct the frame ID using the function start. */ trad_frame_set_id (this_cache, frame_id_build (sp, func)); } static void i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* Obviously NetBSD is BSD-based. */ i386bsd_init_abi (info, gdbarch); /* NetBSD has a different `struct reg'. */ tdep->gregset_reg_offset = i386nbsd_r_reg_offset; tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset); tdep->sizeof_gregset = 16 * 4; /* NetBSD uses -freg-struct-return by default. */ tdep->struct_return = reg_struct_return; /* NetBSD uses tramp_frame sniffers for signal trampolines. */ tdep->sigcontext_addr= 0; tdep->sigtramp_start = 0; tdep->sigtramp_end = 0; tdep->sigtramp_p = 0; tdep->sc_reg_offset = 0; tdep->sc_num_regs = 0; tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16); tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2); tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2); tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31); tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4); } /* NetBSD ELF. */ static void i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* It's still NetBSD. */ i386nbsd_init_abi (info, gdbarch); /* But ELF-based. */ i386_elf_init_abi (info, gdbarch); /* NetBSD ELF uses SVR4-style shared libraries. */ set_solib_svr4_fetch_link_map_offsets (gdbarch, svr4_ilp32_fetch_link_map_offsets); /* NetBSD ELF uses -fpcc-struct-return by default. */ tdep->struct_return = pcc_struct_return; } void _initialize_i386nbsd_tdep (void) { gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD, i386nbsdelf_init_abi); }