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. */
24 #include <sys/ptrace.h>
27 #include <sys/param.h>
31 #include <sys/ioctl.h>
42 exec_one_dummy_insn
PARAMS ((void));
44 /* Conversion from gdb-to-system special purpose register numbers.. */
46 static int special_regs
[] = {
57 fetch_inferior_registers (regno
)
61 extern char registers
[];
63 if (regno
< 0) { /* for all registers */
65 /* read 32 general purpose registers. */
67 for (ii
=0; ii
< 32; ++ii
)
68 *(int*)®isters
[REGISTER_BYTE (ii
)] =
69 ptrace (PT_READ_GPR
, inferior_pid
, (PTRACE_ARG3_TYPE
) ii
, 0, 0);
71 /* read general purpose floating point registers. */
73 for (ii
=0; ii
< 32; ++ii
)
74 ptrace (PT_READ_FPR
, inferior_pid
,
75 (PTRACE_ARG3_TYPE
) ®isters
[REGISTER_BYTE (FP0_REGNUM
+ii
)],
78 /* read special registers. */
79 for (ii
=0; ii
<= LAST_SP_REGNUM
-FIRST_SP_REGNUM
; ++ii
)
80 *(int*)®isters
[REGISTER_BYTE (FIRST_SP_REGNUM
+ii
)] =
81 ptrace (PT_READ_GPR
, inferior_pid
, (PTRACE_ARG3_TYPE
) special_regs
[ii
],
88 /* else an individual register is addressed. */
90 else if (regno
< FP0_REGNUM
) { /* a GPR */
91 *(int*)®isters
[REGISTER_BYTE (regno
)] =
92 ptrace (PT_READ_GPR
, inferior_pid
, (PTRACE_ARG3_TYPE
) regno
, 0, 0);
94 else if (regno
<= FPLAST_REGNUM
) { /* a FPR */
95 ptrace (PT_READ_FPR
, inferior_pid
,
96 (PTRACE_ARG3_TYPE
) ®isters
[REGISTER_BYTE (regno
)],
97 (regno
-FP0_REGNUM
+FPR0
), 0);
99 else if (regno
<= LAST_SP_REGNUM
) { /* a special register */
100 *(int*)®isters
[REGISTER_BYTE (regno
)] =
101 ptrace (PT_READ_GPR
, inferior_pid
,
102 (PTRACE_ARG3_TYPE
) special_regs
[regno
-FIRST_SP_REGNUM
], 0, 0);
105 fprintf (stderr
, "gdb error: register no %d not implemented.\n", regno
);
107 register_valid
[regno
] = 1;
110 /* Store our register values back into the inferior.
111 If REGNO is -1, do this for all registers.
112 Otherwise, REGNO specifies which register (so we can save time). */
115 store_inferior_registers (regno
)
118 extern char registers
[];
122 if (regno
== -1) { /* for all registers.. */
125 /* execute one dummy instruction (which is a breakpoint) in inferior
126 process. So give kernel a chance to do internal house keeping.
127 Otherwise the following ptrace(2) calls will mess up user stack
128 since kernel will get confused about the bottom of the stack (%sp) */
130 exec_one_dummy_insn ();
132 /* write general purpose registers first! */
133 for ( ii
=GPR0
; ii
<=GPR31
; ++ii
) {
134 ptrace (PT_WRITE_GPR
, inferior_pid
, (PTRACE_ARG3_TYPE
) ii
,
135 *(int*)®isters
[REGISTER_BYTE (ii
)], 0);
137 perror ("ptrace write_gpr"); errno
= 0;
141 /* write floating point registers now. */
142 for ( ii
=0; ii
< 32; ++ii
) {
143 ptrace (PT_WRITE_FPR
, inferior_pid
,
144 (PTRACE_ARG3_TYPE
) ®isters
[REGISTER_BYTE (FP0_REGNUM
+ii
)],
147 perror ("ptrace write_fpr"); errno
= 0;
151 /* write special registers. */
152 for (ii
=0; ii
<= LAST_SP_REGNUM
-FIRST_SP_REGNUM
; ++ii
) {
153 ptrace (PT_WRITE_GPR
, inferior_pid
,
154 (PTRACE_ARG3_TYPE
) special_regs
[ii
],
155 *(int*)®isters
[REGISTER_BYTE (FIRST_SP_REGNUM
+ii
)], 0);
157 perror ("ptrace write_gpr"); errno
= 0;
162 /* else, a specific register number is given... */
164 else if (regno
< FP0_REGNUM
) { /* a GPR */
166 ptrace (PT_WRITE_GPR
, inferior_pid
, (PTRACE_ARG3_TYPE
) regno
,
167 *(int*)®isters
[REGISTER_BYTE (regno
)], 0);
170 else if (regno
<= FPLAST_REGNUM
) { /* a FPR */
171 ptrace (PT_WRITE_FPR
, inferior_pid
,
172 (PTRACE_ARG3_TYPE
) ®isters
[REGISTER_BYTE (regno
)],
173 regno
-FP0_REGNUM
+FPR0
, 0);
176 else if (regno
<= LAST_SP_REGNUM
) { /* a special register */
178 ptrace (PT_WRITE_GPR
, inferior_pid
,
179 (PTRACE_ARG3_TYPE
) special_regs
[regno
-FIRST_SP_REGNUM
],
180 *(int*)®isters
[REGISTER_BYTE (regno
)], 0);
184 fprintf (stderr
, "Gdb error: register no %d not implemented.\n", regno
);
187 perror ("ptrace write"); errno
= 0;
191 /* Execute one dummy breakpoint instruction. This way we give the kernel
192 a chance to do some housekeeping and update inferior's internal data,
195 exec_one_dummy_insn ()
197 #define DUMMY_INSN_ADDR (TEXT_SEGMENT_BASE)+0x200
199 unsigned long shadow
;
200 unsigned int status
, pid
;
202 /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We assume that
203 this address will never be executed again by the real code. */
205 target_insert_breakpoint (DUMMY_INSN_ADDR
, &shadow
);
208 ptrace (PT_CONTINUE
, inferior_pid
, (PTRACE_ARG3_TYPE
) DUMMY_INSN_ADDR
, 0, 0);
210 perror ("pt_continue");
213 pid
= wait (&status
);
214 } while (pid
!= inferior_pid
);
216 target_remove_breakpoint (DUMMY_INSN_ADDR
, &shadow
);
220 fetch_core_registers (core_reg_sect
, core_reg_size
, which
, reg_addr
)
222 unsigned core_reg_size
;
224 unsigned int reg_addr
; /* Unused in this version */
226 /* fetch GPRs and special registers from the first register section
230 /* copy GPRs first. */
231 bcopy (core_reg_sect
, registers
, 32 * 4);
233 /* gdb's internal register template and bfd's register section layout
234 should share a common include file. FIXMEmgo */
235 /* then comes special registes. They are supposed to be in the same
236 order in gdb template and bfd `.reg' section. */
237 core_reg_sect
+= (32 * 4);
238 bcopy (core_reg_sect
, ®isters
[REGISTER_BYTE (FIRST_SP_REGNUM
)],
239 (LAST_SP_REGNUM
- FIRST_SP_REGNUM
+ 1) * 4);
242 /* fetch floating point registers from register section 2 in core bfd. */
244 bcopy (core_reg_sect
, ®isters
[REGISTER_BYTE (FP0_REGNUM
)], 32 * 8);
247 fprintf (stderr
, "Gdb error: unknown parameter to fetch_core_registers().\n");
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