mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-03 04:12:10 +08:00
f933a9c585
* gdbarch.sh (DEPRECATED_EXTRA_STACK_ALIGNMENT_NEEDED): Replace EXTRA_STACK_ALIGNMENT_NEEDED. Default to 0 not 1. * gdbarch.h, gdbarch.c: Re-generate. * config/sparc/tm-sparc.h (DEPRECATED_EXTRA_STACK_ALIGNMENT_NEEDED): Define. * sparc-tdep.c (sparc_gdbarch_init): Set deprecated_extra_stack_alignment_needed. * config/pa/tm-hppa.h (EXTRA_STACK_ALIGNMENT_NEEDED): Delete. * xstormy16-tdep.c (xstormy16_gdbarch_init): Do not clear extra_stack_alignment_needed. * v850-tdep.c (v850_gdbarch_init): Ditto. * hppa-tdep.c (hppa_gdbarch_init): Ditto. * h8300-tdep.c (h8300_gdbarch_init): Ditto. * d10v-tdep.c (d10v_gdbarch_init): Ditto. * cris-tdep.c (cris_gdbarch_init): Ditto. * m68k-tdep.c (m68k_gdbarch_init): Ditto. * m68hc11-tdep.c (m68hc11_gdbarch_init): Ditto.
1187 lines
36 KiB
C
1187 lines
36 KiB
C
/* Target-machine dependent code for Hitachi H8/300, for GDB.
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Copyright 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
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1999, 2000, 2001, 2002, 2003 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 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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/*
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Contributed by Steve Chamberlain
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sac@cygnus.com
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*/
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#include "defs.h"
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#include "value.h"
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#include "inferior.h"
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#include "symfile.h"
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#include "arch-utils.h"
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#include "regcache.h"
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#include "gdbcore.h"
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#include "objfiles.h"
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#include "gdbcmd.h"
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#include "gdb_assert.h"
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/* Extra info which is saved in each frame_info. */
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struct frame_extra_info
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{
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CORE_ADDR from_pc;
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CORE_ADDR args_pointer;
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CORE_ADDR locals_pointer;
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};
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#define E_NUM_REGS (h8300smode ? 14 : 13)
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enum
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{
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h8300_reg_size = 2,
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h8300h_reg_size = 4,
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h8300_max_reg_size = 4,
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};
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#define BINWORD (h8300hmode ? h8300h_reg_size : h8300_reg_size)
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enum gdb_regnum
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{
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E_R0_REGNUM, E_ER0_REGNUM = E_R0_REGNUM, E_ARG0_REGNUM = E_R0_REGNUM,
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E_R1_REGNUM, E_ER1_REGNUM = E_R1_REGNUM,
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E_R2_REGNUM, E_ER2_REGNUM = E_R2_REGNUM, E_ARGLAST_REGNUM = E_R2_REGNUM,
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E_R3_REGNUM, E_ER3_REGNUM = E_R3_REGNUM,
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E_R4_REGNUM, E_ER4_REGNUM = E_R4_REGNUM,
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E_R5_REGNUM, E_ER5_REGNUM = E_R5_REGNUM,
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E_R6_REGNUM, E_ER6_REGNUM = E_R6_REGNUM, E_FP_REGNUM = E_R6_REGNUM,
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E_SP_REGNUM,
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E_CCR_REGNUM,
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E_PC_REGNUM,
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E_CYCLES_REGNUM,
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E_TICK_REGNUM, E_EXR_REGNUM = E_TICK_REGNUM,
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E_INST_REGNUM, E_TICKS_REGNUM = E_INST_REGNUM,
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E_INSTS_REGNUM
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};
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#define UNSIGNED_SHORT(X) ((X) & 0xffff)
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#define IS_PUSH(x) ((x & 0xfff0)==0x6df0)
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#define IS_PUSH_FP(x) (x == 0x6df6)
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#define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6)
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#define IS_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6)
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#define IS_SUB2_SP(x) (x==0x1b87)
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#define IS_SUB4_SP(x) (x==0x1b97)
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#define IS_SUBL_SP(x) (x==0x7a37)
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#define IS_MOVK_R5(x) (x==0x7905)
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#define IS_SUB_R5SP(x) (x==0x1957)
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/* If the instruction at PC is an argument register spill, return its
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length. Otherwise, return zero.
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An argument register spill is an instruction that moves an argument
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from the register in which it was passed to the stack slot in which
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it really lives. It is a byte, word, or longword move from an
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argument register to a negative offset from the frame pointer. */
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static int
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h8300_is_argument_spill (CORE_ADDR pc)
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{
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int w = read_memory_unsigned_integer (pc, 2);
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if ((w & 0xfff0) == 0x6ee0 /* mov.b Rs,@(d:16,er6) */
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&& 8 <= (w & 0xf) && (w & 0xf) <= 10) /* Rs is R0L, R1L, or R2L */
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{
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int w2 = read_memory_integer (pc + 2, 2);
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/* ... and d:16 is negative. */
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if (w2 < 0)
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return 4;
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}
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else if (w == 0x7860)
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{
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int w2 = read_memory_integer (pc + 2, 2);
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if ((w2 & 0xfff0) == 0x6aa0) /* mov.b Rs, @(d:24,er6) */
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{
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LONGEST disp = read_memory_integer (pc + 4, 4);
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/* ... and d:24 is negative. */
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if (disp < 0 && disp > 0xffffff)
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return 8;
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}
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}
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else if ((w & 0xfff0) == 0x6fe0 /* mov.w Rs,@(d:16,er6) */
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&& (w & 0xf) <= 2) /* Rs is R0, R1, or R2 */
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{
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int w2 = read_memory_integer (pc + 2, 2);
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/* ... and d:16 is negative. */
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if (w2 < 0)
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return 4;
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}
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else if (w == 0x78e0)
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{
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int w2 = read_memory_integer (pc + 2, 2);
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if ((w2 & 0xfff0) == 0x6ba0) /* mov.b Rs, @(d:24,er6) */
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{
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LONGEST disp = read_memory_integer (pc + 4, 4);
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/* ... and d:24 is negative. */
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if (disp < 0 && disp > 0xffffff)
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return 8;
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}
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}
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else if (w == 0x0100)
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{
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int w2 = read_memory_integer (pc + 2, 2);
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if ((w2 & 0xfff0) == 0x6fe0 /* mov.l Rs,@(d:16,er6) */
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&& (w2 & 0xf) <= 2) /* Rs is ER0, ER1, or ER2 */
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{
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int w3 = read_memory_integer (pc + 4, 2);
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/* ... and d:16 is negative. */
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if (w3 < 0)
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return 6;
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}
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else if (w2 == 0x78e0)
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{
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int w3 = read_memory_integer (pc + 4, 2);
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if ((w3 & 0xfff0) == 0x6ba0) /* mov.l Rs, @(d:24,er6) */
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{
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LONGEST disp = read_memory_integer (pc + 6, 4);
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/* ... and d:24 is negative. */
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if (disp < 0 && disp > 0xffffff)
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return 10;
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}
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}
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}
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return 0;
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}
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static CORE_ADDR
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h8300_skip_prologue (CORE_ADDR start_pc)
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{
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short int w;
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int adjust = 0;
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/* Skip past all push and stm insns. */
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while (1)
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{
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w = read_memory_unsigned_integer (start_pc, 2);
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/* First look for push insns. */
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if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130)
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{
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w = read_memory_unsigned_integer (start_pc + 2, 2);
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adjust = 2;
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}
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if (IS_PUSH (w))
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{
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start_pc += 2 + adjust;
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w = read_memory_unsigned_integer (start_pc, 2);
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continue;
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}
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adjust = 0;
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break;
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}
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/* Skip past a move to FP, either word or long sized */
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w = read_memory_unsigned_integer (start_pc, 2);
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if (w == 0x0100)
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{
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w = read_memory_unsigned_integer (start_pc + 2, 2);
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adjust += 2;
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}
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if (IS_MOVE_FP (w))
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{
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start_pc += 2 + adjust;
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w = read_memory_unsigned_integer (start_pc, 2);
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}
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/* Check for loading either a word constant into r5;
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long versions are handled by the SUBL_SP below. */
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if (IS_MOVK_R5 (w))
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{
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start_pc += 2;
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w = read_memory_unsigned_integer (start_pc, 2);
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}
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/* Now check for subtracting r5 from sp, word sized only. */
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if (IS_SUB_R5SP (w))
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{
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start_pc += 2 + adjust;
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w = read_memory_unsigned_integer (start_pc, 2);
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}
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/* Check for subs #2 and subs #4. */
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while (IS_SUB2_SP (w) || IS_SUB4_SP (w))
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{
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start_pc += 2 + adjust;
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w = read_memory_unsigned_integer (start_pc, 2);
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}
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/* Check for a 32bit subtract. */
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if (IS_SUBL_SP (w))
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start_pc += 6 + adjust;
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/* Check for spilling an argument register to the stack frame.
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This could also be an initializing store from non-prologue code,
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but I don't think there's any harm in skipping that. */
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for (;;)
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{
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int spill_size = h8300_is_argument_spill (start_pc);
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if (spill_size == 0)
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break;
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start_pc += spill_size;
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}
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return start_pc;
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}
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static int
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gdb_print_insn_h8300 (bfd_vma memaddr, disassemble_info * info)
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{
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if (h8300smode)
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return print_insn_h8300s (memaddr, info);
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else if (h8300hmode)
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return print_insn_h8300h (memaddr, info);
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else
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return print_insn_h8300 (memaddr, info);
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}
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/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
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is not the address of a valid instruction, the address of the next
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instruction beyond ADDR otherwise. *PWORD1 receives the first word
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of the instruction. */
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static CORE_ADDR
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h8300_next_prologue_insn (CORE_ADDR addr, CORE_ADDR lim, unsigned short* pword1)
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{
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char buf[2];
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if (addr < lim + 8)
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{
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read_memory (addr, buf, 2);
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*pword1 = extract_signed_integer (buf, 2);
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return addr + 2;
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}
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return 0;
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}
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/* Examine the prologue of a function. `ip' points to the first instruction.
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`limit' is the limit of the prologue (e.g. the addr of the first
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linenumber, or perhaps the program counter if we're stepping through).
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`frame_sp' is the stack pointer value in use in this frame.
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`fsr' is a pointer to a frame_saved_regs structure into which we put
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info about the registers saved by this frame.
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`fi' is a struct frame_info pointer; we fill in various fields in it
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to reflect the offsets of the arg pointer and the locals pointer. */
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/* Any function with a frame looks like this
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SECOND ARG
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FIRST ARG
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RET PC
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SAVED R2
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SAVED R3
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SAVED FP <-FP POINTS HERE
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LOCALS0
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LOCALS1 <-SP POINTS HERE
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*/
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static CORE_ADDR
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h8300_examine_prologue (register CORE_ADDR ip, register CORE_ADDR limit,
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CORE_ADDR after_prolog_fp, CORE_ADDR *fsr,
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struct frame_info *fi)
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{
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register CORE_ADDR next_ip;
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int r;
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int have_fp = 0;
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unsigned short insn_word;
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/* Number of things pushed onto stack, starts at 2/4, 'cause the
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PC is already there */
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unsigned int reg_save_depth = BINWORD;
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unsigned int auto_depth = 0; /* Number of bytes of autos */
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char in_frame[11]; /* One for each reg */
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int adjust = 0;
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memset (in_frame, 1, 11);
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for (r = 0; r < 8; r++)
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{
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fsr[r] = 0;
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}
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if (after_prolog_fp == 0)
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{
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after_prolog_fp = read_register (E_SP_REGNUM);
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}
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/* If the PC isn't valid, quit now. */
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if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff))
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return 0;
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next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
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if (insn_word == 0x0100)
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{
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insn_word = read_memory_unsigned_integer (ip + 2, 2);
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adjust = 2;
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}
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/* Skip over any fp push instructions */
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fsr[E_FP_REGNUM] = after_prolog_fp;
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while (next_ip && IS_PUSH_FP (insn_word))
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{
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ip = next_ip + adjust;
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in_frame[insn_word & 0x7] = reg_save_depth;
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next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
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reg_save_depth += 2 + adjust;
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}
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/* Is this a move into the fp */
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if (next_ip && IS_MOV_SP_FP (insn_word))
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{
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ip = next_ip;
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next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
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have_fp = 1;
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}
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/* Skip over any stack adjustment, happens either with a number of
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sub#2,sp or a mov #x,r5 sub r5,sp */
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if (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
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{
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while (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
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{
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auto_depth += IS_SUB2_SP (insn_word) ? 2 : 4;
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ip = next_ip;
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next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
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}
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}
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else
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{
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if (next_ip && IS_MOVK_R5 (insn_word))
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{
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ip = next_ip;
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next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
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auto_depth += insn_word;
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next_ip = h8300_next_prologue_insn (next_ip, limit, &insn_word);
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auto_depth += insn_word;
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}
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if (next_ip && IS_SUBL_SP (insn_word))
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{
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ip = next_ip;
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auto_depth += read_memory_unsigned_integer (ip, 4);
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ip += 4;
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next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
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}
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}
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/* Now examine the push insns to determine where everything lives
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on the stack. */
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while (1)
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{
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adjust = 0;
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if (!next_ip)
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break;
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if (insn_word == 0x0100)
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{
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ip = next_ip;
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next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
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adjust = 2;
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}
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if (IS_PUSH (insn_word))
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{
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auto_depth += 2 + adjust;
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fsr[insn_word & 0x7] = after_prolog_fp - auto_depth;
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ip = next_ip;
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next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
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continue;
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}
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|
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/* Now check for push multiple insns. */
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if (insn_word == 0x0110 || insn_word == 0x0120 || insn_word == 0x0130)
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{
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int count = ((insn_word >> 4) & 0xf) + 1;
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int start, i;
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ip = next_ip;
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next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
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start = insn_word & 0x7;
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for (i = start; i < start + count; i++)
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{
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auto_depth += 4;
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fsr[i] = after_prolog_fp - auto_depth;
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}
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}
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break;
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}
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/* The args are always reffed based from the stack pointer */
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get_frame_extra_info (fi)->args_pointer = after_prolog_fp;
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/* Locals are always reffed based from the fp */
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get_frame_extra_info (fi)->locals_pointer = after_prolog_fp;
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/* The PC is at a known place */
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get_frame_extra_info (fi)->from_pc =
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read_memory_unsigned_integer (after_prolog_fp + BINWORD, BINWORD);
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|
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/* Rememeber any others too */
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in_frame[E_PC_REGNUM] = 0;
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if (have_fp)
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/* We keep the old FP in the SP spot */
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fsr[E_SP_REGNUM] = read_memory_unsigned_integer (fsr[E_FP_REGNUM], BINWORD);
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else
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fsr[E_SP_REGNUM] = after_prolog_fp + auto_depth;
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return (ip);
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}
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|
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static void
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h8300_frame_init_saved_regs (struct frame_info *fi)
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{
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CORE_ADDR func_addr, func_end;
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if (!get_frame_saved_regs (fi))
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{
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frame_saved_regs_zalloc (fi);
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|
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/* Find the beginning of this function, so we can analyze its
|
|
prologue. */
|
|
if (find_pc_partial_function (get_frame_pc (fi), NULL, &func_addr, &func_end))
|
|
{
|
|
struct symtab_and_line sal = find_pc_line (func_addr, 0);
|
|
CORE_ADDR limit = (sal.end && sal.end < get_frame_pc (fi)) ? sal.end : get_frame_pc (fi);
|
|
/* This will fill in fields in fi. */
|
|
h8300_examine_prologue (func_addr, limit, get_frame_base (fi),
|
|
get_frame_saved_regs (fi), fi);
|
|
}
|
|
/* Else we're out of luck (can't debug completely stripped code).
|
|
FIXME. */
|
|
}
|
|
}
|
|
|
|
/* Given a GDB frame, determine the address of the calling function's
|
|
frame. This will be used to create a new GDB frame struct, and
|
|
then DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC
|
|
will be called for the new frame.
|
|
|
|
For us, the frame address is its stack pointer value, so we look up
|
|
the function prologue to determine the caller's sp value, and return it. */
|
|
|
|
static CORE_ADDR
|
|
h8300_frame_chain (struct frame_info *thisframe)
|
|
{
|
|
if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (thisframe),
|
|
get_frame_base (thisframe),
|
|
get_frame_base (thisframe)))
|
|
{ /* initialize the from_pc now */
|
|
get_frame_extra_info (thisframe)->from_pc =
|
|
deprecated_read_register_dummy (get_frame_pc (thisframe),
|
|
get_frame_base (thisframe),
|
|
E_PC_REGNUM);
|
|
return get_frame_base (thisframe);
|
|
}
|
|
return get_frame_saved_regs (thisframe)[E_SP_REGNUM];
|
|
}
|
|
|
|
/* Return the saved PC from this frame.
|
|
|
|
If the frame has a memory copy of SRP_REGNUM, use that. If not,
|
|
just use the register SRP_REGNUM itself. */
|
|
|
|
static CORE_ADDR
|
|
h8300_frame_saved_pc (struct frame_info *frame)
|
|
{
|
|
if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame),
|
|
get_frame_base (frame),
|
|
get_frame_base (frame)))
|
|
return deprecated_read_register_dummy (get_frame_pc (frame),
|
|
get_frame_base (frame),
|
|
E_PC_REGNUM);
|
|
else
|
|
return get_frame_extra_info (frame)->from_pc;
|
|
}
|
|
|
|
static void
|
|
h8300_init_extra_frame_info (int fromleaf, struct frame_info *fi)
|
|
{
|
|
if (!get_frame_extra_info (fi))
|
|
{
|
|
frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
|
|
get_frame_extra_info (fi)->from_pc = 0;
|
|
get_frame_extra_info (fi)->args_pointer = 0; /* Unknown */
|
|
get_frame_extra_info (fi)->locals_pointer = 0; /* Unknown */
|
|
|
|
if (!get_frame_pc (fi))
|
|
{
|
|
if (get_next_frame (fi))
|
|
deprecated_update_frame_pc_hack (fi, h8300_frame_saved_pc (get_next_frame (fi)));
|
|
}
|
|
h8300_frame_init_saved_regs (fi);
|
|
}
|
|
}
|
|
|
|
static CORE_ADDR
|
|
h8300_frame_locals_address (struct frame_info *fi)
|
|
{
|
|
if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi),
|
|
get_frame_base (fi)))
|
|
return (CORE_ADDR) 0; /* Not sure what else to do... */
|
|
return get_frame_extra_info (fi)->locals_pointer;
|
|
}
|
|
|
|
/* Return the address of the argument block for the frame
|
|
described by FI. Returns 0 if the address is unknown. */
|
|
|
|
static CORE_ADDR
|
|
h8300_frame_args_address (struct frame_info *fi)
|
|
{
|
|
if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi),
|
|
get_frame_base (fi)))
|
|
return (CORE_ADDR) 0; /* Not sure what else to do... */
|
|
return get_frame_extra_info (fi)->args_pointer;
|
|
}
|
|
|
|
/* Round N up or down to the nearest multiple of UNIT.
|
|
Evaluate N only once, UNIT several times.
|
|
UNIT must be a power of two. */
|
|
#define round_up(n, unit) (((n) + (unit) - 1) & -(unit))
|
|
#define round_down(n, unit) ((n) & -(unit))
|
|
|
|
/* Function: push_arguments
|
|
Setup the function arguments for calling a function in the inferior.
|
|
In this discussion, a `word' is 16 bits on the H8/300s, and 32 bits
|
|
on the H8/300H.
|
|
|
|
There are actually two ABI's here: -mquickcall (the default) and
|
|
-mno-quickcall. With -mno-quickcall, all arguments are passed on
|
|
the stack after the return address, word-aligned. With
|
|
-mquickcall, GCC tries to use r0 -- r2 to pass registers. Since
|
|
GCC doesn't indicate in the object file which ABI was used to
|
|
compile it, GDB only supports the default --- -mquickcall.
|
|
|
|
Here are the rules for -mquickcall, in detail:
|
|
|
|
Each argument, whether scalar or aggregate, is padded to occupy a
|
|
whole number of words. Arguments smaller than a word are padded at
|
|
the most significant end; those larger than a word are padded at
|
|
the least significant end.
|
|
|
|
The initial arguments are passed in r0 -- r2. Earlier arguments go in
|
|
lower-numbered registers. Multi-word arguments are passed in
|
|
consecutive registers, with the most significant end in the
|
|
lower-numbered register.
|
|
|
|
If an argument doesn't fit entirely in the remaining registers, it
|
|
is passed entirely on the stack. Stack arguments begin just after
|
|
the return address. Once an argument has overflowed onto the stack
|
|
this way, all subsequent arguments are passed on the stack.
|
|
|
|
The above rule has odd consequences. For example, on the h8/300s,
|
|
if a function takes two longs and an int as arguments:
|
|
- the first long will be passed in r0/r1,
|
|
- the second long will be passed entirely on the stack, since it
|
|
doesn't fit in r2,
|
|
- and the int will be passed on the stack, even though it could fit
|
|
in r2.
|
|
|
|
A weird exception: if an argument is larger than a word, but not a
|
|
whole number of words in length (before padding), it is passed on
|
|
the stack following the rules for stack arguments above, even if
|
|
there are sufficient registers available to hold it. Stranger
|
|
still, the argument registers are still `used up' --- even though
|
|
there's nothing in them.
|
|
|
|
So, for example, on the h8/300s, if a function expects a three-byte
|
|
structure and an int, the structure will go on the stack, and the
|
|
int will go in r2, not r0.
|
|
|
|
If the function returns an aggregate type (struct, union, or class)
|
|
by value, the caller must allocate space to hold the return value,
|
|
and pass the callee a pointer to this space as an invisible first
|
|
argument, in R0.
|
|
|
|
For varargs functions, the last fixed argument and all the variable
|
|
arguments are always passed on the stack. This means that calls to
|
|
varargs functions don't work properly unless there is a prototype
|
|
in scope.
|
|
|
|
Basically, this ABI is not good, for the following reasons:
|
|
- You can't call vararg functions properly unless a prototype is in scope.
|
|
- Structure passing is inconsistent, to no purpose I can see.
|
|
- It often wastes argument registers, of which there are only three
|
|
to begin with. */
|
|
|
|
static CORE_ADDR
|
|
h8300_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
|
|
int struct_return, CORE_ADDR struct_addr)
|
|
{
|
|
int stack_align, stack_alloc, stack_offset;
|
|
int wordsize = BINWORD;
|
|
int reg;
|
|
int argument;
|
|
|
|
/* First, make sure the stack is properly aligned. */
|
|
sp = round_down (sp, wordsize);
|
|
|
|
/* Now make sure there's space on the stack for the arguments. We
|
|
may over-allocate a little here, but that won't hurt anything. */
|
|
stack_alloc = 0;
|
|
for (argument = 0; argument < nargs; argument++)
|
|
stack_alloc += round_up (TYPE_LENGTH (VALUE_TYPE (args[argument])),
|
|
wordsize);
|
|
sp -= stack_alloc;
|
|
|
|
/* Now load as many arguments as possible into registers, and push
|
|
the rest onto the stack. */
|
|
reg = E_ARG0_REGNUM;
|
|
stack_offset = 0;
|
|
|
|
/* If we're returning a structure by value, then we must pass a
|
|
pointer to the buffer for the return value as an invisible first
|
|
argument. */
|
|
if (struct_return)
|
|
write_register (reg++, struct_addr);
|
|
|
|
for (argument = 0; argument < nargs; argument++)
|
|
{
|
|
struct type *type = VALUE_TYPE (args[argument]);
|
|
int len = TYPE_LENGTH (type);
|
|
char *contents = (char *) VALUE_CONTENTS (args[argument]);
|
|
|
|
/* Pad the argument appropriately. */
|
|
int padded_len = round_up (len, wordsize);
|
|
char *padded = alloca (padded_len);
|
|
|
|
memset (padded, 0, padded_len);
|
|
memcpy (len < wordsize ? padded + padded_len - len : padded,
|
|
contents, len);
|
|
|
|
/* Could the argument fit in the remaining registers? */
|
|
if (padded_len <= (E_ARGLAST_REGNUM - reg + 1) * wordsize)
|
|
{
|
|
/* Are we going to pass it on the stack anyway, for no good
|
|
reason? */
|
|
if (len > wordsize && len % wordsize)
|
|
{
|
|
/* I feel so unclean. */
|
|
write_memory (sp + stack_offset, padded, padded_len);
|
|
stack_offset += padded_len;
|
|
|
|
/* That's right --- even though we passed the argument
|
|
on the stack, we consume the registers anyway! Love
|
|
me, love my dog. */
|
|
reg += padded_len / wordsize;
|
|
}
|
|
else
|
|
{
|
|
/* Heavens to Betsy --- it's really going in registers!
|
|
It would be nice if we could use write_register_bytes
|
|
here, but on the h8/300s, there are gaps between
|
|
the registers in the register file. */
|
|
int offset;
|
|
|
|
for (offset = 0; offset < padded_len; offset += wordsize)
|
|
{
|
|
ULONGEST word = extract_address (padded + offset, wordsize);
|
|
write_register (reg++, word);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* It doesn't fit in registers! Onto the stack it goes. */
|
|
write_memory (sp + stack_offset, padded, padded_len);
|
|
stack_offset += padded_len;
|
|
|
|
/* Once one argument has spilled onto the stack, all
|
|
subsequent arguments go on the stack. */
|
|
reg = E_ARGLAST_REGNUM + 1;
|
|
}
|
|
}
|
|
|
|
return sp;
|
|
}
|
|
|
|
/* Function: push_return_address
|
|
Setup the return address for a dummy frame, as called by
|
|
call_function_by_hand. Only necessary when you are using an
|
|
empty CALL_DUMMY, ie. the target will not actually be executing
|
|
a JSR/BSR instruction. */
|
|
|
|
static CORE_ADDR
|
|
h8300_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
|
|
{
|
|
unsigned char buf[4];
|
|
int wordsize = BINWORD;
|
|
|
|
sp -= wordsize;
|
|
store_unsigned_integer (buf, wordsize, CALL_DUMMY_ADDRESS ());
|
|
write_memory (sp, buf, wordsize);
|
|
return sp;
|
|
}
|
|
|
|
/* Function: h8300_pop_frame
|
|
Restore the machine to the state it had before the current frame
|
|
was created. Usually used either by the "RETURN" command, or by
|
|
call_function_by_hand after the dummy_frame is finished. */
|
|
|
|
static void
|
|
h8300_pop_frame (void)
|
|
{
|
|
unsigned regno;
|
|
struct frame_info *frame = get_current_frame ();
|
|
|
|
if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame),
|
|
get_frame_base (frame),
|
|
get_frame_base (frame)))
|
|
{
|
|
generic_pop_dummy_frame ();
|
|
}
|
|
else
|
|
{
|
|
for (regno = 0; regno < 8; regno++)
|
|
{
|
|
/* Don't forget E_SP_REGNUM is a frame_saved_regs struct is the
|
|
actual value we want, not the address of the value we want. */
|
|
if (get_frame_saved_regs (frame)[regno] && regno != E_SP_REGNUM)
|
|
write_register (regno,
|
|
read_memory_integer (get_frame_saved_regs (frame)[regno],
|
|
BINWORD));
|
|
else if (get_frame_saved_regs (frame)[regno] && regno == E_SP_REGNUM)
|
|
write_register (regno, get_frame_base (frame) + 2 * BINWORD);
|
|
}
|
|
|
|
/* Don't forget to update the PC too! */
|
|
write_register (E_PC_REGNUM, get_frame_extra_info (frame)->from_pc);
|
|
}
|
|
flush_cached_frames ();
|
|
}
|
|
|
|
/* Function: extract_return_value
|
|
Figure out where in REGBUF the called function has left its return value.
|
|
Copy that into VALBUF. Be sure to account for CPU type. */
|
|
|
|
static void
|
|
h8300_extract_return_value (struct type *type, char *regbuf, char *valbuf)
|
|
{
|
|
int wordsize = BINWORD;
|
|
int len = TYPE_LENGTH (type);
|
|
|
|
switch (len)
|
|
{
|
|
case 1: /* (char) */
|
|
case 2: /* (short), (int) */
|
|
memcpy (valbuf, regbuf + REGISTER_BYTE (0) + (wordsize - len), len);
|
|
break;
|
|
case 4: /* (long), (float) */
|
|
if (wordsize == 4)
|
|
{
|
|
memcpy (valbuf, regbuf + REGISTER_BYTE (0), 4);
|
|
}
|
|
else
|
|
{
|
|
memcpy (valbuf, regbuf + REGISTER_BYTE (0), 2);
|
|
memcpy (valbuf + 2, regbuf + REGISTER_BYTE (1), 2);
|
|
}
|
|
break;
|
|
case 8: /* (double) (doesn't seem to happen, which is good,
|
|
because this almost certainly isn't right. */
|
|
error ("I don't know how a double is returned.");
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Function: store_return_value
|
|
Place the appropriate value in the appropriate registers.
|
|
Primarily used by the RETURN command. */
|
|
|
|
static void
|
|
h8300_store_return_value (struct type *type, char *valbuf)
|
|
{
|
|
int regval;
|
|
int wordsize = BINWORD;
|
|
int len = TYPE_LENGTH (type);
|
|
|
|
switch (len)
|
|
{
|
|
case 1: /* char */
|
|
case 2: /* short, int */
|
|
regval = extract_address (valbuf, len);
|
|
write_register (0, regval);
|
|
break;
|
|
case 4: /* long, float */
|
|
regval = extract_address (valbuf, len);
|
|
if (wordsize == 4)
|
|
{
|
|
write_register (0, regval);
|
|
}
|
|
else
|
|
{
|
|
write_register (0, regval >> 16);
|
|
write_register (1, regval & 0xffff);
|
|
}
|
|
break;
|
|
case 8: /* presumeably double, but doesn't seem to happen */
|
|
error ("I don't know how to return a double.");
|
|
break;
|
|
}
|
|
}
|
|
|
|
static struct cmd_list_element *setmachinelist;
|
|
|
|
static const char *
|
|
h8300_register_name (int regno)
|
|
{
|
|
/* The register names change depending on whether the h8300h processor
|
|
type is selected. */
|
|
static char *h8300_register_names[] = {
|
|
"r0", "r1", "r2", "r3", "r4", "r5", "r6",
|
|
"sp", "ccr","pc","cycles", "tick", "inst", ""
|
|
};
|
|
static char *h8300s_register_names[] = {
|
|
"er0", "er1", "er2", "er3", "er4", "er5", "er6",
|
|
"sp", "ccr", "pc", "cycles", "exr", "tick", "inst"
|
|
};
|
|
char **register_names =
|
|
h8300smode ? h8300s_register_names : h8300_register_names;
|
|
if (regno < 0 || regno >= E_NUM_REGS)
|
|
internal_error (__FILE__, __LINE__,
|
|
"h8300_register_name: illegal register number %d", regno);
|
|
else
|
|
return register_names[regno];
|
|
}
|
|
|
|
static void
|
|
h8300_print_register (struct gdbarch *gdbarch, struct ui_file *file,
|
|
struct frame_info *frame, int regno)
|
|
{
|
|
ULONGEST rval;
|
|
long val;
|
|
const char *name = h8300_register_name (regno);
|
|
|
|
if (!name || !*name)
|
|
return;
|
|
|
|
/* FIXME: cagney/2002-10-22: The code below assumes that VAL is at
|
|
least 4 bytes (32 bits) in size and hence is large enough to hold
|
|
the largest h8300 register. Should instead be using ULONGEST and
|
|
the phex() functions. */
|
|
gdb_assert (sizeof (val) >= 4);
|
|
frame_read_unsigned_register (frame, regno, &rval);
|
|
val = rval;
|
|
|
|
fprintf_filtered (file, "%-14s ", name);
|
|
if (h8300hmode)
|
|
{
|
|
if (val)
|
|
fprintf_filtered (file, "0x%08lx %-8ld", val, val);
|
|
else
|
|
fprintf_filtered (file, "0x%-8lx %-8ld", val, val);
|
|
}
|
|
else
|
|
{
|
|
if (val)
|
|
fprintf_filtered (file, "0x%04lx %-4ld", val, val);
|
|
else
|
|
fprintf_filtered (file, "0x%-4lx %-4ld", val, val);
|
|
}
|
|
if (regno == E_CCR_REGNUM)
|
|
{
|
|
/* CCR register */
|
|
int C, Z, N, V;
|
|
unsigned char b[h8300h_reg_size];
|
|
unsigned char l;
|
|
frame_register_read (deprecated_selected_frame, regno, b);
|
|
l = b[REGISTER_VIRTUAL_SIZE (E_CCR_REGNUM) - 1];
|
|
fprintf_filtered (file, "\t");
|
|
fprintf_filtered (file, "I-%d ", (l & 0x80) != 0);
|
|
fprintf_filtered (file, "UI-%d ", (l & 0x40) != 0);
|
|
fprintf_filtered (file, "H-%d ", (l & 0x20) != 0);
|
|
fprintf_filtered (file, "U-%d ", (l & 0x10) != 0);
|
|
N = (l & 0x8) != 0;
|
|
Z = (l & 0x4) != 0;
|
|
V = (l & 0x2) != 0;
|
|
C = (l & 0x1) != 0;
|
|
fprintf_filtered (file, "N-%d ", N);
|
|
fprintf_filtered (file, "Z-%d ", Z);
|
|
fprintf_filtered (file, "V-%d ", V);
|
|
fprintf_filtered (file, "C-%d ", C);
|
|
if ((C | Z) == 0)
|
|
fprintf_filtered (file, "u> ");
|
|
if ((C | Z) == 1)
|
|
fprintf_filtered (file, "u<= ");
|
|
if ((C == 0))
|
|
fprintf_filtered (file, "u>= ");
|
|
if (C == 1)
|
|
fprintf_filtered (file, "u< ");
|
|
if (Z == 0)
|
|
fprintf_filtered (file, "!= ");
|
|
if (Z == 1)
|
|
fprintf_filtered (file, "== ");
|
|
if ((N ^ V) == 0)
|
|
fprintf_filtered (file, ">= ");
|
|
if ((N ^ V) == 1)
|
|
fprintf_filtered (file, "< ");
|
|
if ((Z | (N ^ V)) == 0)
|
|
fprintf_filtered (file, "> ");
|
|
if ((Z | (N ^ V)) == 1)
|
|
fprintf_filtered (file, "<= ");
|
|
}
|
|
else if (regno == E_EXR_REGNUM && h8300smode)
|
|
{
|
|
/* EXR register */
|
|
unsigned char b[h8300h_reg_size];
|
|
unsigned char l;
|
|
frame_register_read (deprecated_selected_frame, regno, b);
|
|
l = b[REGISTER_VIRTUAL_SIZE (E_EXR_REGNUM) - 1];
|
|
fprintf_filtered (file, "\t");
|
|
fprintf_filtered (file, "T-%d - - - ", (l & 0x80) != 0);
|
|
fprintf_filtered (file, "I2-%d ", (l & 4) != 0);
|
|
fprintf_filtered (file, "I1-%d ", (l & 2) != 0);
|
|
fprintf_filtered (file, "I0-%d", (l & 1) != 0);
|
|
}
|
|
fprintf_filtered (file, "\n");
|
|
}
|
|
|
|
static void
|
|
h8300_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file,
|
|
struct frame_info *frame, int regno, int cpregs)
|
|
{
|
|
if (regno < 0)
|
|
for (regno = 0; regno < E_NUM_REGS; ++regno)
|
|
h8300_print_register (gdbarch, file, frame, regno);
|
|
else
|
|
h8300_print_register (gdbarch, file, frame, regno);
|
|
}
|
|
|
|
static CORE_ADDR
|
|
h8300_saved_pc_after_call (struct frame_info *ignore)
|
|
{
|
|
return read_memory_unsigned_integer (read_register (E_SP_REGNUM), BINWORD);
|
|
}
|
|
|
|
static int
|
|
h8300_register_byte (int regno)
|
|
{
|
|
if (regno < 0 || regno >= E_NUM_REGS)
|
|
internal_error (__FILE__, __LINE__,
|
|
"h8300_register_byte: illegal register number %d", regno);
|
|
else
|
|
return regno * BINWORD;
|
|
}
|
|
|
|
static int
|
|
h8300_register_raw_size (int regno)
|
|
{
|
|
if (regno < 0 || regno >= E_NUM_REGS)
|
|
internal_error (__FILE__, __LINE__,
|
|
"h8300_register_raw_size: illegal register number %d",
|
|
regno);
|
|
else
|
|
return BINWORD;
|
|
}
|
|
|
|
static struct type *
|
|
h8300_register_virtual_type (int regno)
|
|
{
|
|
if (regno < 0 || regno >= E_NUM_REGS)
|
|
internal_error (__FILE__, __LINE__,
|
|
"h8300_register_virtual_type: illegal register number %d",
|
|
regno);
|
|
else
|
|
return h8300hmode ?
|
|
builtin_type_unsigned_long : builtin_type_unsigned_short;
|
|
}
|
|
|
|
static void
|
|
h8300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
|
|
{
|
|
write_register (0, addr);
|
|
}
|
|
|
|
static int
|
|
h8300_use_struct_convention (int gcc_p, struct type *type)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static CORE_ADDR
|
|
h8300_extract_struct_value_address (char *regbuf)
|
|
{
|
|
return extract_address (regbuf + h8300_register_byte (E_ARG0_REGNUM),
|
|
h8300_register_raw_size (E_ARG0_REGNUM));
|
|
}
|
|
|
|
const static unsigned char *
|
|
h8300_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
|
|
{
|
|
/*static unsigned char breakpoint[] = { 0x7A, 0xFF };*/ /* ??? */
|
|
static unsigned char breakpoint[] = { 0x01, 0x80 }; /* Sleep */
|
|
|
|
*lenptr = sizeof (breakpoint);
|
|
return breakpoint;
|
|
}
|
|
|
|
static void
|
|
h8300_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
|
|
struct frame_info *frame, const char *args)
|
|
{
|
|
fprintf_filtered (file, "\
|
|
No floating-point info available for this processor.\n");
|
|
}
|
|
|
|
static struct gdbarch *
|
|
h8300_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
|
|
{
|
|
static LONGEST call_dummy_words[1] = { 0 };
|
|
struct gdbarch_tdep *tdep = NULL;
|
|
struct gdbarch *gdbarch;
|
|
|
|
arches = gdbarch_list_lookup_by_info (arches, &info);
|
|
if (arches != NULL)
|
|
return arches->gdbarch;
|
|
|
|
#if 0
|
|
tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
|
|
#endif
|
|
|
|
if (info.bfd_arch_info->arch != bfd_arch_h8300)
|
|
return NULL;
|
|
|
|
switch (info.bfd_arch_info->mach)
|
|
{
|
|
case bfd_mach_h8300:
|
|
h8300smode = 0;
|
|
h8300hmode = 0;
|
|
break;
|
|
case bfd_mach_h8300h:
|
|
h8300smode = 0;
|
|
h8300hmode = 1;
|
|
break;
|
|
case bfd_mach_h8300s:
|
|
h8300smode = 1;
|
|
h8300hmode = 1;
|
|
break;
|
|
}
|
|
|
|
gdbarch = gdbarch_alloc (&info, 0);
|
|
|
|
/* NOTE: cagney/2002-12-06: This can be deleted when this arch is
|
|
ready to unwind the PC first (see frame.c:get_prev_frame()). */
|
|
set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
|
|
|
|
/*
|
|
* Basic register fields and methods.
|
|
*/
|
|
|
|
set_gdbarch_num_regs (gdbarch, E_NUM_REGS);
|
|
set_gdbarch_num_pseudo_regs (gdbarch, 0);
|
|
set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
|
|
set_gdbarch_fp_regnum (gdbarch, E_FP_REGNUM);
|
|
set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
|
|
set_gdbarch_register_name (gdbarch, h8300_register_name);
|
|
set_gdbarch_register_size (gdbarch, BINWORD);
|
|
set_gdbarch_register_bytes (gdbarch, E_NUM_REGS * BINWORD);
|
|
set_gdbarch_register_byte (gdbarch, h8300_register_byte);
|
|
set_gdbarch_register_raw_size (gdbarch, h8300_register_raw_size);
|
|
set_gdbarch_deprecated_max_register_raw_size (gdbarch, h8300h_reg_size);
|
|
set_gdbarch_register_virtual_size (gdbarch, h8300_register_raw_size);
|
|
set_gdbarch_deprecated_max_register_virtual_size (gdbarch, h8300h_reg_size);
|
|
set_gdbarch_register_virtual_type (gdbarch, h8300_register_virtual_type);
|
|
set_gdbarch_print_registers_info (gdbarch, h8300_print_registers_info);
|
|
set_gdbarch_print_float_info (gdbarch, h8300_print_float_info);
|
|
|
|
/*
|
|
* Frame Info
|
|
*/
|
|
set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, h8300_frame_init_saved_regs);
|
|
set_gdbarch_deprecated_init_extra_frame_info (gdbarch, h8300_init_extra_frame_info);
|
|
set_gdbarch_deprecated_frame_chain (gdbarch, h8300_frame_chain);
|
|
set_gdbarch_saved_pc_after_call (gdbarch, h8300_saved_pc_after_call);
|
|
set_gdbarch_deprecated_frame_saved_pc (gdbarch, h8300_frame_saved_pc);
|
|
set_gdbarch_skip_prologue (gdbarch, h8300_skip_prologue);
|
|
set_gdbarch_frame_args_address (gdbarch, h8300_frame_args_address);
|
|
set_gdbarch_frame_locals_address (gdbarch, h8300_frame_locals_address);
|
|
|
|
/*
|
|
* Miscelany
|
|
*/
|
|
/* Stack grows up. */
|
|
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
|
|
/* PC stops zero byte after a trap instruction
|
|
(which means: exactly on trap instruction). */
|
|
set_gdbarch_decr_pc_after_break (gdbarch, 0);
|
|
/* This value is almost never non-zero... */
|
|
set_gdbarch_function_start_offset (gdbarch, 0);
|
|
/* This value is almost never non-zero... */
|
|
set_gdbarch_frame_args_skip (gdbarch, 0);
|
|
/* OK to default this value to 'unknown'. */
|
|
set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
|
|
set_gdbarch_frameless_function_invocation (gdbarch,
|
|
frameless_look_for_prologue);
|
|
|
|
/*
|
|
* Call Dummies
|
|
*
|
|
* These values and methods are used when gdb calls a target function. */
|
|
set_gdbarch_push_return_address (gdbarch, h8300_push_return_address);
|
|
set_gdbarch_deprecated_extract_return_value (gdbarch, h8300_extract_return_value);
|
|
set_gdbarch_push_arguments (gdbarch, h8300_push_arguments);
|
|
set_gdbarch_deprecated_pop_frame (gdbarch, h8300_pop_frame);
|
|
set_gdbarch_deprecated_store_struct_return (gdbarch, h8300_store_struct_return);
|
|
set_gdbarch_deprecated_store_return_value (gdbarch, h8300_store_return_value);
|
|
set_gdbarch_deprecated_extract_struct_value_address (gdbarch, h8300_extract_struct_value_address);
|
|
set_gdbarch_use_struct_convention (gdbarch, h8300_use_struct_convention);
|
|
set_gdbarch_call_dummy_address (gdbarch, entry_point_address);
|
|
set_gdbarch_call_dummy_start_offset (gdbarch, 0);
|
|
set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
|
|
set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
|
|
set_gdbarch_call_dummy_length (gdbarch, 0);
|
|
set_gdbarch_call_dummy_p (gdbarch, 1);
|
|
set_gdbarch_call_dummy_words (gdbarch, call_dummy_words);
|
|
set_gdbarch_sizeof_call_dummy_words (gdbarch, 0);
|
|
set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
|
|
set_gdbarch_breakpoint_from_pc (gdbarch, h8300_breakpoint_from_pc);
|
|
|
|
set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT);
|
|
set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT);
|
|
set_gdbarch_ptr_bit (gdbarch, BINWORD * TARGET_CHAR_BIT);
|
|
set_gdbarch_addr_bit (gdbarch, BINWORD * TARGET_CHAR_BIT);
|
|
|
|
/* set_gdbarch_stack_align (gdbarch, SOME_stack_align); */
|
|
set_gdbarch_believe_pcc_promotion (gdbarch, 1);
|
|
|
|
return gdbarch;
|
|
}
|
|
|
|
void
|
|
_initialize_h8300_tdep (void)
|
|
{
|
|
tm_print_insn = gdb_print_insn_h8300;
|
|
register_gdbarch_init (bfd_arch_h8300, h8300_gdbarch_init);
|
|
}
|