277 lines
7.7 KiB
C
277 lines
7.7 KiB
C
/* Target-dependent code for Motorola 68000 BSD's.
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Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "frame.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "gdbtypes.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "m68k-tdep.h"
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#include "solib-svr4.h"
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/* Core file support. */
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/* Sizeof `struct reg' in <machine/reg.h>. */
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#define M68KBSD_SIZEOF_GREGS (18 * 4)
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/* Sizeof `struct fpreg' in <machine/reg.h. */
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#define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
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int
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m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum)
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{
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int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum));
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if (regnum >= M68K_FPC_REGNUM)
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return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
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return (regnum - M68K_FP0_REGNUM) * fp_len;
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}
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/* Supply register REGNUM from the buffer specified by FPREGS and LEN
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in the floating-point register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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m68kbsd_supply_fpregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *fpregs, size_t len)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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const gdb_byte *regs = fpregs;
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int i;
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gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
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for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i,
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regs + m68kbsd_fpreg_offset (gdbarch, i));
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}
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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m68kbsd_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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const gdb_byte *regs = gregs;
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int i;
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gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
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for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + i * 4);
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}
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if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
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{
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regs += M68KBSD_SIZEOF_GREGS;
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len -= M68KBSD_SIZEOF_GREGS;
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m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
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}
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}
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/* Motorola 68000 register sets. */
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static struct regset m68kbsd_gregset =
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{
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NULL,
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m68kbsd_supply_gregset
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};
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static struct regset m68kbsd_fpregset =
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{
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NULL,
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m68kbsd_supply_fpregset
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};
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/* Return the appropriate register set for the core section identified
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by SECT_NAME and SECT_SIZE. */
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static const struct regset *
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m68kbsd_regset_from_core_section (struct gdbarch *gdbarch,
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const char *sect_name, size_t sect_size)
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{
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if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS)
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return &m68kbsd_gregset;
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if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS)
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return &m68kbsd_fpregset;
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return NULL;
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}
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/* Signal trampolines. */
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static void
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m68kobsd_sigtramp_cache_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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CORE_ADDR addr, base, pc;
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int regnum;
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base = get_frame_register_unsigned (this_frame, M68K_SP_REGNUM);
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/* The 'addql #4,%sp' instruction at offset 8 adjusts the stack
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pointer. Adjust the frame base accordingly. */
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pc = get_frame_register_unsigned (this_frame, M68K_PC_REGNUM);
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if ((pc - func) > 8)
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base -= 4;
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/* Get frame pointer, stack pointer, program counter and processor
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state from `struct sigcontext'. */
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addr = get_frame_memory_unsigned (this_frame, base + 8, 4);
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trad_frame_set_reg_addr (this_cache, M68K_FP_REGNUM, addr + 8);
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trad_frame_set_reg_addr (this_cache, M68K_SP_REGNUM, addr + 12);
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trad_frame_set_reg_addr (this_cache, M68K_PC_REGNUM, addr + 20);
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trad_frame_set_reg_addr (this_cache, M68K_PS_REGNUM, addr + 24);
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/* The sc_ap member of `struct sigcontext' points to additional
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hardware state. Here we find the missing registers. */
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addr = get_frame_memory_unsigned (this_frame, addr + 16, 4) + 4;
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for (regnum = M68K_D0_REGNUM; regnum < M68K_FP_REGNUM; regnum++, addr += 4)
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trad_frame_set_reg_addr (this_cache, regnum, addr);
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/* Construct the frame ID using the function start. */
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trad_frame_set_id (this_cache, frame_id_build (base, func));
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}
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static const struct tramp_frame m68kobsd_sigtramp = {
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SIGTRAMP_FRAME,
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2,
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{
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{ 0x206f, -1 }, { 0x000c, -1}, /* moveal %sp@(12),%a0 */
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{ 0x4e90, -1 }, /* jsr %a0@ */
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{ 0x588f, -1 }, /* addql #4,%sp */
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{ 0x4e41, -1 }, /* trap #1 */
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{ 0x2f40, -1 }, { 0x0004, -1 }, /* moveal %d0,%sp@(4) */
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{ 0x7001, -1 }, /* moveq #SYS_exit,%d0 */
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{ 0x4e40, -1 }, /* trap #0 */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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m68kobsd_sigtramp_cache_init
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};
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static void
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m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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tdep->jb_pc = 5;
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tdep->jb_elt_size = 4;
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set_gdbarch_decr_pc_after_break (gdbarch, 2);
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set_gdbarch_regset_from_core_section
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(gdbarch, m68kbsd_regset_from_core_section);
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}
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/* OpenBSD and NetBSD a.out. */
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static void
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m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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m68kbsd_init_abi (info, gdbarch);
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tdep->struct_return = reg_struct_return;
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tramp_frame_prepend_unwinder (gdbarch, &m68kobsd_sigtramp);
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}
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/* NetBSD ELF. */
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static void
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m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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m68kbsd_init_abi (info, gdbarch);
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/* NetBSD ELF uses the SVR4 ABI. */
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m68k_svr4_init_abi (info, gdbarch);
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tdep->struct_return = pcc_struct_return;
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/* NetBSD ELF uses SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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}
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static enum gdb_osabi
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m68kbsd_aout_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0
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|| strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0)
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return GDB_OSABI_NETBSD_AOUT;
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return GDB_OSABI_UNKNOWN;
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}
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static enum gdb_osabi
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m68kbsd_core_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
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return GDB_OSABI_NETBSD_AOUT;
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_m68kbsd_tdep (void);
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void
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_initialize_m68kbsd_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour,
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m68kbsd_aout_osabi_sniffer);
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/* BFD doesn't set a flavour for NetBSD style a.out core files. */
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gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour,
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m68kbsd_core_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT,
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m68kbsd_aout_init_abi);
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gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF,
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m68kbsd_elf_init_abi);
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}
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