1 /* Low level DECstation interface to ptrace, for GDB when running native.
2 Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
3 Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
4 and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
25 #include <sys/ptrace.h>
26 #include <setjmp.h> /* For JB_XXX. */
28 #include <sys/types.h>
29 #include <sys/param.h>
32 /* These are needed on various systems to expand REGISTER_U_ADDR. */
37 #include <sys/ptrace.h>
39 /* Size of elements in jmpbuf */
41 #define JB_ELEMENT_SIZE 4
43 /* Map gdb internal register number to ptrace ``address''.
44 These ``addresses'' are defined in DECstation <sys/ptrace.h> */
46 #define REGISTER_PTRACE_ADDR(regno) \
47 (regno < 32 ? GPR_BASE + regno \
48 : regno == PC_REGNUM ? PC \
49 : regno == CAUSE_REGNUM ? CAUSE \
50 : regno == HI_REGNUM ? MMHI \
51 : regno == LO_REGNUM ? MMLO \
52 : regno == FCRCS_REGNUM ? FPC_CSR \
53 : regno == FCRIR_REGNUM ? FPC_EIR \
54 : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \
57 static const char zerobuf
[MAX_REGISTER_RAW_SIZE
];
59 /* Get all registers from the inferior */
62 fetch_inferior_registers (regno
)
65 register unsigned int regaddr
;
66 char buf
[MAX_REGISTER_RAW_SIZE
];
71 for (regno
= 1; regno
< NUM_REGS
; regno
++)
73 regaddr
= REGISTER_PTRACE_ADDR (regno
);
74 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
76 *(int *) &buf
[i
] = ptrace (PT_READ_U
, inferior_pid
,
77 (PTRACE_ARG3_TYPE
) regaddr
, 0);
78 regaddr
+= sizeof (int);
80 supply_register (regno
, buf
);
83 supply_register (ZERO_REGNUM
, zerobuf
);
84 /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
85 supply_register (FP_REGNUM
, zerobuf
);
88 /* Store our register values back into the inferior.
89 If REGNO is -1, do this for all registers.
90 Otherwise, REGNO specifies which register (so we can save time). */
93 store_inferior_registers (regno
)
96 register unsigned int regaddr
;
104 regaddr
= REGISTER_PTRACE_ADDR (regno
);
106 ptrace (PT_WRITE_U
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
107 read_register (regno
));
110 sprintf (buf
, "writing register number %d", regno
);
111 perror_with_name (buf
);
116 for (regno
= 0; regno
< NUM_REGS
; regno
++)
118 if (regno
== ZERO_REGNUM
|| regno
== PS_REGNUM
119 || regno
== BADVADDR_REGNUM
|| regno
== CAUSE_REGNUM
120 || regno
== FCRIR_REGNUM
|| regno
== FP_REGNUM
121 || (regno
>= FIRST_EMBED_REGNUM
&& regno
<= LAST_EMBED_REGNUM
))
123 regaddr
= register_addr (regno
, 1);
125 ptrace (6, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
126 read_register (regno
));
129 sprintf (buf
, "writing all regs, number %d", regno
);
130 perror_with_name (buf
);
137 /* Figure out where the longjmp will land.
138 We expect the first arg to be a pointer to the jmp_buf structure from which
139 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
140 This routine returns true on success. */
143 get_longjmp_target(pc
)
148 jb_addr
= read_register(A0_REGNUM
);
150 if (target_read_memory(jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, pc
,
154 SWAP_TARGET_AND_HOST(pc
, sizeof(CORE_ADDR
));
159 /* Extract the register values out of the core file and store
160 them where `read_register' will find them.
162 CORE_REG_SECT points to the register values themselves, read into memory.
163 CORE_REG_SIZE is the size of that area.
164 WHICH says which set of registers we are handling (0 = int, 2 = float
165 on machines where they are discontiguous).
166 REG_ADDR is the offset from u.u_ar0 to the register values relative to
167 core_reg_sect. This is used with old-fashioned core files to
168 locate the registers in a large upage-plus-stack ".reg" section.
169 Original upage address X is at location core_reg_sect+x+reg_addr.
173 fetch_core_registers (core_reg_sect
, core_reg_size
, which
, reg_addr
)
175 unsigned core_reg_size
;
180 register unsigned int addr
;
182 register reg_ptr
= -reg_addr
; /* Original u.u_ar0 is -reg_addr. */
184 /* If u.u_ar0 was an absolute address in the core file, relativize it now,
185 so we can use it as an offset into core_reg_sect. When we're done,
186 "register 0" will be at core_reg_sect+reg_ptr, and we can use
187 register_addr to offset to the other registers. If this is a modern
188 core file without a upage, reg_ptr will be zero and this is all a big
190 if (reg_ptr
> core_reg_size
)
191 reg_ptr
-= KERNEL_U_ADDR
;
193 for (regno
= 0; regno
< NUM_REGS
; regno
++)
195 addr
= register_addr (regno
, reg_ptr
);
196 if (addr
>= core_reg_size
) {
200 supply_register (regno
, core_reg_sect
+ addr
);
205 error ("Register %s not found in core file.", reg_names
[bad_reg
]);
207 supply_register (ZERO_REGNUM
, zerobuf
);
208 /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
209 supply_register (FP_REGNUM
, zerobuf
);
212 /* Return the address in the core dump or inferior of register REGNO.
213 BLOCKEND is the address of the end of the user structure. */
216 register_addr (regno
, blockend
)
222 if (regno
< 0 || regno
>= NUM_REGS
)
223 error ("Invalid register number %d.", regno
);
225 REGISTER_U_ADDR (addr
, blockend
, regno
);