55809acbfc
dependencies. * m68k-tdep.c (m68k_gdbarch_init): Call gdbarch_init_osabi at the end. * m68klinux-tdep.c (m68k_linux_init_abi): New function. (_initialize_m68k_linux_tdep): New function. (m68k_linux_frame_saved_pc): Make static. (m68k_linux_extract_return_value): Likewise. (m68k_linux_store_return_value): Likewise. (m68k_linux_extract_struct_value_address): Likewise. * config/m68k/tm-linux.h (DEPRECATED_EXTRACT_RETURN_VALUE): Remove. (DEPRECATED_STORE_RETURN_VALUE): Remove. (DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS): Remove. (DEPRECATED_FRAME_SAVED_PC): Remove.
207 lines
6.5 KiB
C
207 lines
6.5 KiB
C
/* Motorola m68k target-dependent support for GNU/Linux.
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Copyright 1996, 1998, 2000, 2001, 2002, 2003 Free Software Foundation,
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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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "frame.h"
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#include "target.h"
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#include "gdb_string.h"
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#include "gdbtypes.h"
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#include "osabi.h"
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#include "m68k-tdep.h"
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/* Check whether insn1 and insn2 are parts of a signal trampoline. */
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#define IS_SIGTRAMP(insn1, insn2) \
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(/* addaw #20,sp; moveq #119,d0; trap #0 */ \
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(insn1 == 0xdefc0014 && insn2 == 0x70774e40) \
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/* moveq #119,d0; trap #0 */ \
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|| insn1 == 0x70774e40)
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#define IS_RT_SIGTRAMP(insn1, insn2) \
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(/* movel #173,d0; trap #0 */ \
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(insn1 == 0x203c0000 && insn2 == 0x00ad4e40) \
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/* moveq #82,d0; notb d0; trap #0 */ \
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|| (insn1 == 0x70524600 && (insn2 >> 16) == 0x4e40))
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/* Return non-zero if PC points into the signal trampoline. For the sake
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of m68k_linux_frame_saved_pc we also distinguish between non-RT and RT
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signal trampolines. */
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int
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m68k_linux_in_sigtramp (CORE_ADDR pc)
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{
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CORE_ADDR sp;
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char buf[12];
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unsigned long insn0, insn1, insn2;
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if (read_memory_nobpt (pc - 4, buf, sizeof (buf)))
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return 0;
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insn1 = extract_unsigned_integer (buf + 4, 4);
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insn2 = extract_unsigned_integer (buf + 8, 4);
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if (IS_SIGTRAMP (insn1, insn2))
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return 1;
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if (IS_RT_SIGTRAMP (insn1, insn2))
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return 2;
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insn0 = extract_unsigned_integer (buf, 4);
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if (IS_SIGTRAMP (insn0, insn1))
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return 1;
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if (IS_RT_SIGTRAMP (insn0, insn1))
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return 2;
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insn0 = ((insn0 << 16) & 0xffffffff) | (insn1 >> 16);
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insn1 = ((insn1 << 16) & 0xffffffff) | (insn2 >> 16);
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if (IS_SIGTRAMP (insn0, insn1))
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return 1;
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if (IS_RT_SIGTRAMP (insn0, insn1))
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return 2;
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return 0;
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}
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/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
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#define SIGCONTEXT_PC_OFFSET 26
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/* Offset to saved PC in ucontext, from <asm/ucontext.h>. */
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#define UCONTEXT_PC_OFFSET 88
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/* Get saved user PC for sigtramp from sigcontext or ucontext. */
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static CORE_ADDR
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m68k_linux_sigtramp_saved_pc (struct frame_info *frame)
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{
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CORE_ADDR sigcontext_addr;
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char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
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int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT;
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int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
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/* Get sigcontext address, it is the third parameter on the stack. */
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if (get_next_frame (frame))
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sigcontext_addr
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= read_memory_unsigned_integer (get_frame_base (get_next_frame (frame))
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+ FRAME_ARGS_SKIP
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+ sigcontext_offs,
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ptrbytes);
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else
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sigcontext_addr
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= read_memory_unsigned_integer (read_register (SP_REGNUM)
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+ sigcontext_offs,
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ptrbytes);
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/* Don't cause a memory_error when accessing sigcontext in case the
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stack layout has changed or the stack is corrupt. */
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if (m68k_linux_in_sigtramp (get_frame_pc (frame)) == 2)
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target_read_memory (sigcontext_addr + UCONTEXT_PC_OFFSET, buf, ptrbytes);
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else
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target_read_memory (sigcontext_addr + SIGCONTEXT_PC_OFFSET, buf, ptrbytes);
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return extract_unsigned_integer (buf, ptrbytes);
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}
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/* Return the saved program counter for FRAME. */
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static CORE_ADDR
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m68k_linux_frame_saved_pc (struct frame_info *frame)
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{
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if (get_frame_type (frame) == SIGTRAMP_FRAME)
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return m68k_linux_sigtramp_saved_pc (frame);
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return read_memory_unsigned_integer (get_frame_base (frame) + 4, 4);
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}
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/* The following definitions are appropriate when using the ELF
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format, where floating point values are returned in fp0, pointer
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values in a0 and other values in d0. */
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/* Extract from an array REGBUF containing the (raw) register state a
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function return value of type TYPE, and copy that, in virtual
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format, into VALBUF. */
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static void
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m68k_linux_extract_return_value (struct type *type, char *regbuf, char *valbuf)
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{
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if (TYPE_CODE (type) == TYPE_CODE_FLT)
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{
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REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM, type,
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regbuf + REGISTER_BYTE (FP0_REGNUM),
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valbuf);
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}
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else if (TYPE_CODE (type) == TYPE_CODE_PTR)
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memcpy (valbuf, regbuf + REGISTER_BYTE (M68K_A0_REGNUM),
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TYPE_LENGTH (type));
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else
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memcpy (valbuf,
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regbuf + (TYPE_LENGTH (type) >= 4 ? 0 : 4 - TYPE_LENGTH (type)),
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TYPE_LENGTH (type));
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}
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/* Write into appropriate registers a function return value of type
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TYPE, given in virtual format. */
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static void
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m68k_linux_store_return_value (struct type *type, char *valbuf)
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{
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if (TYPE_CODE (type) == TYPE_CODE_FLT)
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{
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char raw_buffer[REGISTER_RAW_SIZE (FP0_REGNUM)];
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REGISTER_CONVERT_TO_RAW (type, FP0_REGNUM, valbuf, raw_buffer);
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deprecated_write_register_bytes (REGISTER_BYTE (FP0_REGNUM),
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raw_buffer, TYPE_LENGTH (type));
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}
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else
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{
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if (TYPE_CODE (type) == TYPE_CODE_PTR)
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deprecated_write_register_bytes (REGISTER_BYTE (M68K_A0_REGNUM),
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valbuf, TYPE_LENGTH (type));
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deprecated_write_register_bytes (0, valbuf, TYPE_LENGTH (type));
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}
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}
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/* Extract from an array REGBUF containing the (raw) register state
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the address in which a function should return its structure value,
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as a CORE_ADDR. */
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static CORE_ADDR
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m68k_linux_extract_struct_value_address (char *regbuf)
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{
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return *(CORE_ADDR *) (regbuf + REGISTER_BYTE (M68K_A0_REGNUM));
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}
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static void
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m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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set_gdbarch_deprecated_frame_saved_pc (gdbarch,
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m68k_linux_frame_saved_pc);
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set_gdbarch_deprecated_extract_return_value (gdbarch,
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m68k_linux_extract_return_value);
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set_gdbarch_deprecated_store_return_value (gdbarch,
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m68k_linux_store_return_value);
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set_gdbarch_deprecated_extract_struct_value_address (gdbarch,
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m68k_linux_extract_struct_value_address);
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}
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void
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_initialize_m68k_linux_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_LINUX,
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m68k_linux_init_abi);
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}
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