1 /* Acorn Risc Machine host machine support.
2 Copyright (C) 1988, 1989, 1991 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 "arm-opcode.h"
27 #include <sys/param.h>
30 #include <sys/ioctl.h>
31 #include <sys/ptrace.h>
32 #include <machine/reg.h>
34 #define N_TXTADDR(hdr) 0x8000
35 #define N_DATADDR(hdr) (hdr.a_text + 0x8000)
39 #include <sys/user.h> /* After a.out.h */
46 fetch_inferior_registers (regno
)
50 register unsigned int regaddr
;
51 char buf
[MAX_REGISTER_RAW_SIZE
];
55 unsigned int offset
= (char *) &u
.u_ar0
- (char *) &u
;
56 offset
= ptrace (PT_READ_U
, inferior_pid
, offset
, 0) - KERNEL_U_ADDR
;
60 for (regno
= 0; regno
< 16; regno
++)
62 regaddr
= offset
+ regno
* 4;
63 *(int *)&buf
[0] = ptrace (PT_READ_U
, inferior_pid
, regaddr
, 0);
64 if (regno
== PC_REGNUM
)
65 *(int *)&buf
[0] = GET_PC_PART(*(int *)&buf
[0]);
66 supply_register (regno
, buf
);
68 *(int *)&buf
[0] = ptrace (PT_READ_U
, inferior_pid
, offset
+ PC
*4);
69 supply_register (PS_REGNUM
, buf
); /* set virtual register ps same as pc */
71 /* read the floating point registers */
72 offset
= (char *) &u
.u_fp_regs
- (char *)&u
;
73 *(int *)buf
= ptrace (PT_READ_U
, inferior_pid
, offset
, 0);
74 supply_register (FPS_REGNUM
, buf
);
75 for (regno
= 16; regno
< 24; regno
++) {
76 regaddr
= offset
+ 4 + 12 * (regno
- 16);
77 for (i
= 0; i
< 12; i
+= sizeof(int))
78 *(int *) &buf
[i
] = ptrace (PT_READ_U
, inferior_pid
, regaddr
+ i
, 0);
79 supply_register (regno
, buf
);
83 /* Store our register values back into the inferior.
84 If REGNO is -1, do this for all registers.
85 Otherwise, REGNO specifies which register (so we can save time). */
87 store_inferior_registers (regno
)
90 register unsigned int regaddr
;
95 unsigned int offset
= (char *) &u
.u_ar0
- (char *) &u
;
96 offset
= ptrace (PT_READ_U
, inferior_pid
, offset
, 0) - KERNEL_U_ADDR
;
99 if (regno
>= 16) return;
100 regaddr
= offset
+ 4 * regno
;
102 value
= read_register(regno
);
103 if (regno
== PC_REGNUM
)
104 value
= SET_PC_PART(read_register (PS_REGNUM
), value
);
105 ptrace (PT_WRITE_U
, inferior_pid
, regaddr
, value
);
108 sprintf (buf
, "writing register number %d", regno
);
109 perror_with_name (buf
);
112 else for (regno
= 0; regno
< 15; regno
++)
114 regaddr
= offset
+ regno
* 4;
116 value
= read_register(regno
);
117 if (regno
== PC_REGNUM
)
118 value
= SET_PC_PART(read_register (PS_REGNUM
), value
);
119 ptrace (6, inferior_pid
, regaddr
, value
);
122 sprintf (buf
, "writing all regs, number %d", regno
);
123 perror_with_name (buf
);
128 /* Work with core dump and executable files, for GDB.
129 This code would be in core.c if it weren't machine-dependent. */
131 /* Structure to describe the chain of shared libraries used
133 e.g. prog shares Xt which shares X11 which shares c. */
135 struct shared_library
{
136 struct exec_header header
;
138 CORE_ADDR text_start
; /* CORE_ADDR of 1st byte of text, this file */
139 long data_offset
; /* offset of data section in file */
140 int chan
; /* file descriptor for the file */
141 struct shared_library
*shares
; /* library this one shares */
143 static struct shared_library
*shlib
= 0;
145 /* Hook for `exec_file_command' command to call. */
147 extern void (*exec_file_display_hook
) ();
149 static CORE_ADDR unshared_text_start
;
151 /* extended header from exec file (for shared library info) */
153 static struct exec_header exec_header
;
156 core_file_command (filename
, from_tty
)
161 extern char registers
[];
163 /* Discard all vestiges of any previous core file
164 and mark data and stack spaces as empty. */
176 stack_start
= STACK_END_ADDR
;
177 stack_end
= STACK_END_ADDR
;
179 /* Now, if a new core file was specified, open it and digest it. */
183 filename
= tilde_expand (filename
);
184 make_cleanup (free
, filename
);
186 if (have_inferior_p ())
187 error ("To look at a core file, you must kill the inferior with \"kill\".");
188 corechan
= open (filename
, O_RDONLY
, 0);
190 perror_with_name (filename
);
191 /* 4.2-style (and perhaps also sysV-style) core dump file. */
195 unsigned int reg_offset
, fp_reg_offset
;
197 val
= myread (corechan
, &u
, sizeof u
);
199 perror_with_name ("Not a core file: reading upage");
201 error ("Not a core file: could only read %d bytes", val
);
203 /* We are depending on exec_file_command having been called
204 previously to set exec_data_start. Since the executable
205 and the core file share the same text segment, the address
206 of the data segment will be the same in both. */
207 data_start
= exec_data_start
;
209 data_end
= data_start
+ NBPG
* u
.u_dsize
;
210 stack_start
= stack_end
- NBPG
* u
.u_ssize
;
211 data_offset
= NBPG
* UPAGES
;
212 stack_offset
= NBPG
* (UPAGES
+ u
.u_dsize
);
214 /* Some machines put an absolute address in here and some put
215 the offset in the upage of the regs. */
216 reg_offset
= (int) u
.u_ar0
;
217 if (reg_offset
> NBPG
* UPAGES
)
218 reg_offset
-= KERNEL_U_ADDR
;
219 fp_reg_offset
= (char *) &u
.u_fp_regs
- (char *)&u
;
221 /* I don't know where to find this info.
222 So, for now, mark it as not available. */
223 N_SET_MAGIC (core_aouthdr
, 0);
225 /* Read the register values out of the core file and store
226 them where `read_register' will find them. */
231 for (regno
= 0; regno
< NUM_REGS
; regno
++)
233 char buf
[MAX_REGISTER_RAW_SIZE
];
236 val
= lseek (corechan
, reg_offset
+ 4 * regno
, 0);
238 val
= lseek (corechan
, fp_reg_offset
+ 4 + 12*(regno
- 24), 0);
239 else if (regno
== 24)
240 val
= lseek (corechan
, fp_reg_offset
, 0);
241 else if (regno
== 25)
242 val
= lseek (corechan
, reg_offset
+ 4 * PC
, 0);
244 || (val
= myread (corechan
, buf
, sizeof buf
)) < 0)
246 char * buffer
= (char *) alloca (strlen (reg_names
[regno
])
248 strcpy (buffer
, "Reading register ");
249 strcat (buffer
, reg_names
[regno
]);
251 perror_with_name (buffer
);
254 if (regno
== PC_REGNUM
)
255 *(int *)buf
= GET_PC_PART(*(int *)buf
);
256 supply_register (regno
, buf
);
260 if (filename
[0] == '/')
261 corefile
= savestring (filename
, strlen (filename
));
264 corefile
= concat (current_directory
, "/", filename
);
267 set_current_frame ( create_new_frame (read_register (FP_REGNUM
),
269 select_frame (get_current_frame (), 0);
273 printf ("No core file now.\n");