1 /* Machine-dependent code for host Mach 386's for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 GDB is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 1, or (at your option)
11 GDB is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GDB; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20 #if defined (GDB_TARGET_IS_MACH386)
30 #include <sys/param.h>
34 #include <sys/ioctl.h>
37 #include <sys/ptrace.h>
38 #include <machine/reg.h>
45 fetch_inferior_registers ()
47 struct regs inferior_registers;
48 struct fp_state inferior_fp_registers;
49 extern char registers[];
53 ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
54 ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
56 bcopy (&inferior_registers, registers, sizeof inferior_registers);
58 bcopy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)],
59 sizeof inferior_fp_registers.f_st);
60 bcopy (&inferior_fp_registers.f_ctrl,
61 ®isters[REGISTER_BYTE (FPC_REGNUM)],
62 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
65 /* Store our register values back into the inferior.
66 If REGNO is -1, do this for all registers.
67 Otherwise, REGNO specifies which register (so we can save time). */
69 store_inferior_registers (regno)
72 struct regs inferior_registers;
73 struct fp_state inferior_fp_registers;
74 extern char registers[];
76 bcopy (registers, &inferior_registers, 20 * 4);
78 bcopy (®isters[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
79 sizeof inferior_fp_registers.f_st);
80 bcopy (®isters[REGISTER_BYTE (FPC_REGNUM)],
81 &inferior_fp_registers.f_ctrl,
82 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
85 if (regno == FP_REGNUM || regno == -1)
86 /* Storing the frame pointer requires a gross hack, in which an
87 instruction that moves eax into ebp gets single-stepped. */
89 int stack = inferior_registers.r_reg[SP_REGNUM];
90 int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, stack);
91 int reg = inferior_registers.r_reg[EAX];
92 inferior_registers.r_reg[EAX] =
93 inferior_registers.r_reg[FP_REGNUM];
94 ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
95 ptrace (PTRACE_POKEDATA, inferior_pid, stack, 0xc589);
96 ptrace (PTRACE_SINGLESTEP, inferior_pid, stack, 0);
98 ptrace (PTRACE_POKEDATA, inferior_pid, stack, stuff);
99 inferior_registers.r_reg[EAX] = reg;
102 ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
103 ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
106 /* Machine-dependent code which would otherwise be in core.c */
107 /* Work with core files, for GDB. */
111 fetch_core_registers (core_reg_sect, core_reg_size, which)
113 unsigned core_reg_size;
117 extern char registers[];
122 bcopy (core_reg_sect, registers, core_reg_size);
126 bcopy (core_reg_sect,
127 ®isters[REGISTER_BYTE (FP0_REGNUM)],
128 core_reg_size); /* FIXME, probably bogus */
130 bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
131 ®isters[REGISTER_BYTE (FPC_REGNUM)],
132 sizeof corestr.c_fpu.f_fpstatus -
133 sizeof corestr.c_fpu.f_fpstatus.f_st);
138 #else /* Not mach386 target. */
140 /* These functions shouldn't be called when we're cross-debugging. */
143 fetch_inferior_registers ()
148 store_inferior_registers (regno)
155 fetch_core_registers (core_reg_sect, core_reg_size, which)
157 unsigned core_reg_size;
162 #endif /* Not mach386 target. */