1 /* Low level DECstation interface to ptrace, for GDB when running native.
2 Copyright 1988, 1989, 1991, 1992, 1993, 1995, 1996, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
5 and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
28 #include <sys/ptrace.h>
29 #include <sys/types.h>
30 #include <sys/param.h>
45 #include <setjmp.h> /* For JB_XXX. */
47 /* Size of elements in jmpbuf */
49 #define JB_ELEMENT_SIZE 4
51 /* Map gdb internal register number to ptrace ``address''.
52 These ``addresses'' are defined in DECstation <sys/ptrace.h> */
54 #define REGISTER_PTRACE_ADDR(regno) \
55 (regno < 32 ? GPR_BASE + regno \
56 : regno == PC_REGNUM ? PC \
57 : regno == CAUSE_REGNUM ? CAUSE \
58 : regno == HI_REGNUM ? MMHI \
59 : regno == LO_REGNUM ? MMLO \
60 : regno == FCRCS_REGNUM ? FPC_CSR \
61 : regno == FCRIR_REGNUM ? FPC_EIR \
62 : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \
65 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] =
68 static void fetch_core_registers (char *, unsigned, int, CORE_ADDR
);
70 /* Get all registers from the inferior */
73 fetch_inferior_registers (int regno
)
75 register unsigned int regaddr
;
76 char buf
[MAX_REGISTER_RAW_SIZE
];
81 for (regno
= 1; regno
< NUM_REGS
; regno
++)
83 regaddr
= REGISTER_PTRACE_ADDR (regno
);
84 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
86 *(int *) &buf
[i
] = ptrace (PT_READ_U
, PIDGET (inferior_ptid
),
87 (PTRACE_ARG3_TYPE
) regaddr
, 0);
88 regaddr
+= sizeof (int);
90 supply_register (regno
, buf
);
93 supply_register (ZERO_REGNUM
, zerobuf
);
94 /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
95 supply_register (FP_REGNUM
, zerobuf
);
98 /* Store our register values back into the inferior.
99 If REGNO is -1, do this for all registers.
100 Otherwise, REGNO specifies which register (so we can save time). */
103 store_inferior_registers (int regno
)
105 register unsigned int regaddr
;
110 if (regno
== ZERO_REGNUM
|| regno
== PS_REGNUM
111 || regno
== BADVADDR_REGNUM
|| regno
== CAUSE_REGNUM
112 || regno
== FCRIR_REGNUM
|| regno
== FP_REGNUM
113 || (regno
>= FIRST_EMBED_REGNUM
&& regno
<= LAST_EMBED_REGNUM
))
115 regaddr
= REGISTER_PTRACE_ADDR (regno
);
117 ptrace (PT_WRITE_U
, PIDGET (inferior_ptid
), (PTRACE_ARG3_TYPE
) regaddr
,
118 read_register (regno
));
121 sprintf (buf
, "writing register number %d", regno
);
122 perror_with_name (buf
);
127 for (regno
= 0; regno
< NUM_REGS
; regno
++)
128 store_inferior_registers (regno
);
133 /* Figure out where the longjmp will land.
134 We expect the first arg to be a pointer to the jmp_buf structure from which
135 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
136 This routine returns true on success. */
139 get_longjmp_target (CORE_ADDR
*pc
)
144 buf
= alloca (TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
145 jb_addr
= read_register (A0_REGNUM
);
147 if (target_read_memory (jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, buf
,
148 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
151 *pc
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
156 /* Extract the register values out of the core file and store
157 them where `read_register' will find them.
159 CORE_REG_SECT points to the register values themselves, read into memory.
160 CORE_REG_SIZE is the size of that area.
161 WHICH says which set of registers we are handling (0 = int, 2 = float
162 on machines where they are discontiguous).
163 REG_ADDR is the offset from u.u_ar0 to the register values relative to
164 core_reg_sect. This is used with old-fashioned core files to
165 locate the registers in a large upage-plus-stack ".reg" section.
166 Original upage address X is at location core_reg_sect+x+reg_addr.
170 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
, int which
,
174 register unsigned int addr
;
176 register reg_ptr
= -reg_addr
; /* Original u.u_ar0 is -reg_addr. */
178 /* If u.u_ar0 was an absolute address in the core file, relativize it now,
179 so we can use it as an offset into core_reg_sect. When we're done,
180 "register 0" will be at core_reg_sect+reg_ptr, and we can use
181 register_addr to offset to the other registers. If this is a modern
182 core file without a upage, reg_ptr will be zero and this is all a big
184 if (reg_ptr
> core_reg_size
)
186 reg_ptr
-= KERNEL_U_ADDR
;
188 error ("Old mips core file can't be processed on this machine.");
191 for (regno
= 0; regno
< NUM_REGS
; regno
++)
193 addr
= register_addr (regno
, reg_ptr
);
194 if (addr
>= core_reg_size
)
201 supply_register (regno
, core_reg_sect
+ addr
);
206 error ("Register %s not found in core file.", REGISTER_NAME (bad_reg
));
208 supply_register (ZERO_REGNUM
, zerobuf
);
209 /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
210 supply_register (FP_REGNUM
, zerobuf
);
213 /* Return the address in the core dump or inferior of register REGNO.
214 BLOCKEND is the address of the end of the user structure. */
217 register_addr (int regno
, CORE_ADDR blockend
)
221 if (regno
< 0 || regno
>= NUM_REGS
)
222 error ("Invalid register number %d.", regno
);
224 REGISTER_U_ADDR (addr
, blockend
, regno
);
230 /* Register that we are able to handle mips core file formats.
231 FIXME: is this really bfd_target_unknown_flavour? */
233 static struct core_fns mips_core_fns
=
235 bfd_target_unknown_flavour
, /* core_flavour */
236 default_check_format
, /* check_format */
237 default_core_sniffer
, /* core_sniffer */
238 fetch_core_registers
, /* core_read_registers */
243 _initialize_core_mips (void)
245 add_core_fns (&mips_core_fns
);