1 /* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program 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 2 of the License, or
9 (at your option) any later version.
11 This program 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 this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
25 #include <sys/ptrace.h>
28 #include <sys/param.h>
32 #include <sys/ioctl.h>
43 exec_one_dummy_insn PARAMS ((void));
45 /* Conversion from gdb-to-system special purpose register numbers.. */
47 static int special_regs[] = {
58 fetch_inferior_registers (regno)
62 extern char registers[];
64 if (regno < 0) { /* for all registers */
66 /* read 32 general purpose registers. */
68 for (ii=0; ii < 32; ++ii)
69 *(int*)®isters[REGISTER_BYTE (ii)] =
70 ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii, 0, 0);
72 /* read general purpose floating point registers. */
74 for (ii=0; ii < 32; ++ii)
75 ptrace (PT_READ_FPR, inferior_pid,
76 (PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (FP0_REGNUM+ii)],
79 /* read special registers. */
80 for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii)
81 *(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)] =
82 ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) special_regs[ii],
89 /* else an individual register is addressed. */
91 else if (regno < FP0_REGNUM) { /* a GPR */
92 *(int*)®isters[REGISTER_BYTE (regno)] =
93 ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno, 0, 0);
95 else if (regno <= FPLAST_REGNUM) { /* a FPR */
96 ptrace (PT_READ_FPR, inferior_pid,
97 (PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (regno)],
98 (regno-FP0_REGNUM+FPR0), 0);
100 else if (regno <= LAST_SP_REGNUM) { /* a special register */
101 *(int*)®isters[REGISTER_BYTE (regno)] =
102 ptrace (PT_READ_GPR, inferior_pid,
103 (PTRACE_ARG3_TYPE) special_regs[regno-FIRST_SP_REGNUM], 0, 0);
106 fprintf (stderr, "gdb error: register no %d not implemented.\n", regno);
108 register_valid [regno] = 1;
111 /* Store our register values back into the inferior.
112 If REGNO is -1, do this for all registers.
113 Otherwise, REGNO specifies which register (so we can save time). */
116 store_inferior_registers (regno)
119 extern char registers[];
123 if (regno == -1) { /* for all registers.. */
126 /* execute one dummy instruction (which is a breakpoint) in inferior
127 process. So give kernel a chance to do internal house keeping.
128 Otherwise the following ptrace(2) calls will mess up user stack
129 since kernel will get confused about the bottom of the stack (%sp) */
131 exec_one_dummy_insn ();
133 /* write general purpose registers first! */
134 for ( ii=GPR0; ii<=GPR31; ++ii) {
135 ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii,
136 *(int*)®isters[REGISTER_BYTE (ii)], 0);
138 perror ("ptrace write_gpr"); errno = 0;
142 /* write floating point registers now. */
143 for ( ii=0; ii < 32; ++ii) {
144 ptrace (PT_WRITE_FPR, inferior_pid,
145 (PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (FP0_REGNUM+ii)],
148 perror ("ptrace write_fpr"); errno = 0;
152 /* write special registers. */
153 for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii) {
154 ptrace (PT_WRITE_GPR, inferior_pid,
155 (PTRACE_ARG3_TYPE) special_regs[ii],
156 *(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)], 0);
158 perror ("ptrace write_gpr"); errno = 0;
163 /* else, a specific register number is given... */
165 else if (regno < FP0_REGNUM) { /* a GPR */
167 ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno,
168 *(int*)®isters[REGISTER_BYTE (regno)], 0);
171 else if (regno <= FPLAST_REGNUM) { /* a FPR */
172 ptrace (PT_WRITE_FPR, inferior_pid,
173 (PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (regno)],
174 regno-FP0_REGNUM+FPR0, 0);
177 else if (regno <= LAST_SP_REGNUM) { /* a special register */
179 ptrace (PT_WRITE_GPR, inferior_pid,
180 (PTRACE_ARG3_TYPE) special_regs [regno-FIRST_SP_REGNUM],
181 *(int*)®isters[REGISTER_BYTE (regno)], 0);
185 fprintf (stderr, "Gdb error: register no %d not implemented.\n", regno);
188 perror ("ptrace write"); errno = 0;
192 /* Execute one dummy breakpoint instruction. This way we give the kernel
193 a chance to do some housekeeping and update inferior's internal data,
196 exec_one_dummy_insn ()
198 #define DUMMY_INSN_ADDR (TEXT_SEGMENT_BASE)+0x200
200 unsigned long shadow;
201 unsigned int status, pid;
203 /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We assume that
204 this address will never be executed again by the real code. */
206 target_insert_breakpoint (DUMMY_INSN_ADDR, &shadow);
209 ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) DUMMY_INSN_ADDR, 0, 0);
211 perror ("pt_continue");
214 pid = wait (&status);
215 } while (pid != inferior_pid);
217 target_remove_breakpoint (DUMMY_INSN_ADDR, &shadow);
221 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
223 unsigned core_reg_size;
225 unsigned int reg_addr; /* Unused in this version */
227 /* fetch GPRs and special registers from the first register section
231 /* copy GPRs first. */
232 bcopy (core_reg_sect, registers, 32 * 4);
234 /* gdb's internal register template and bfd's register section layout
235 should share a common include file. FIXMEmgo */
236 /* then comes special registes. They are supposed to be in the same
237 order in gdb template and bfd `.reg' section. */
238 core_reg_sect += (32 * 4);
239 bcopy (core_reg_sect, ®isters [REGISTER_BYTE (FIRST_SP_REGNUM)],
240 (LAST_SP_REGNUM - FIRST_SP_REGNUM + 1) * 4);
243 /* fetch floating point registers from register section 2 in core bfd. */
245 bcopy (core_reg_sect, ®isters [REGISTER_BYTE (FP0_REGNUM)], 32 * 8);
248 fprintf (stderr, "Gdb error: unknown parameter to fetch_core_registers().\n");