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 <sys/types.h>
27 #include <sys/param.h>
42 #include <setjmp.h> /* For JB_XXX. */
44 /* Size of elements in jmpbuf */
46 #define JB_ELEMENT_SIZE 4
48 /* Map gdb internal register number to ptrace ``address''.
49 These ``addresses'' are defined in DECstation <sys/ptrace.h> */
51 #define REGISTER_PTRACE_ADDR(regno) \
52 (regno < 32 ? GPR_BASE + regno \
53 : regno == PC_REGNUM ? PC \
54 : regno == CAUSE_REGNUM ? CAUSE \
55 : regno == HI_REGNUM ? MMHI \
56 : regno == LO_REGNUM ? MMLO \
57 : regno == FCRCS_REGNUM ? FPC_CSR \
58 : regno == FCRIR_REGNUM ? FPC_EIR \
59 : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \
62 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] = {0};
64 /* Get all registers from the inferior */
67 fetch_inferior_registers (regno
)
70 register unsigned int regaddr
;
71 char buf
[MAX_REGISTER_RAW_SIZE
];
76 for (regno
= 1; regno
< NUM_REGS
; regno
++)
78 regaddr
= REGISTER_PTRACE_ADDR (regno
);
79 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
81 *(int *) &buf
[i
] = ptrace (PT_READ_U
, inferior_pid
,
82 (PTRACE_ARG3_TYPE
) regaddr
, 0);
83 regaddr
+= sizeof (int);
85 supply_register (regno
, buf
);
88 supply_register (ZERO_REGNUM
, zerobuf
);
89 /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
90 supply_register (FP_REGNUM
, zerobuf
);
93 /* Store our register values back into the inferior.
94 If REGNO is -1, do this for all registers.
95 Otherwise, REGNO specifies which register (so we can save time). */
98 store_inferior_registers (regno
)
101 register unsigned int regaddr
;
109 regaddr
= REGISTER_PTRACE_ADDR (regno
);
111 ptrace (PT_WRITE_U
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
112 read_register (regno
));
115 sprintf (buf
, "writing register number %d", regno
);
116 perror_with_name (buf
);
121 for (regno
= 0; regno
< NUM_REGS
; regno
++)
123 if (regno
== ZERO_REGNUM
|| regno
== PS_REGNUM
124 || regno
== BADVADDR_REGNUM
|| regno
== CAUSE_REGNUM
125 || regno
== FCRIR_REGNUM
|| regno
== FP_REGNUM
126 || (regno
>= FIRST_EMBED_REGNUM
&& regno
<= LAST_EMBED_REGNUM
))
128 regaddr
= register_addr (regno
, 1);
130 ptrace (6, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
131 read_register (regno
));
134 sprintf (buf
, "writing all regs, number %d", regno
);
135 perror_with_name (buf
);
142 /* Figure out where the longjmp will land.
143 We expect the first arg to be a pointer to the jmp_buf structure from which
144 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
145 This routine returns true on success. */
148 get_longjmp_target(pc
)
153 jb_addr
= read_register(A0_REGNUM
);
155 if (target_read_memory(jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, pc
,
159 SWAP_TARGET_AND_HOST(pc
, sizeof(CORE_ADDR
));
164 /* Extract the register values out of the core file and store
165 them where `read_register' will find them.
167 CORE_REG_SECT points to the register values themselves, read into memory.
168 CORE_REG_SIZE is the size of that area.
169 WHICH says which set of registers we are handling (0 = int, 2 = float
170 on machines where they are discontiguous).
171 REG_ADDR is the offset from u.u_ar0 to the register values relative to
172 core_reg_sect. This is used with old-fashioned core files to
173 locate the registers in a large upage-plus-stack ".reg" section.
174 Original upage address X is at location core_reg_sect+x+reg_addr.
178 fetch_core_registers (core_reg_sect
, core_reg_size
, which
, reg_addr
)
180 unsigned core_reg_size
;
185 register unsigned int addr
;
187 register reg_ptr
= -reg_addr
; /* Original u.u_ar0 is -reg_addr. */
189 /* If u.u_ar0 was an absolute address in the core file, relativize it now,
190 so we can use it as an offset into core_reg_sect. When we're done,
191 "register 0" will be at core_reg_sect+reg_ptr, and we can use
192 register_addr to offset to the other registers. If this is a modern
193 core file without a upage, reg_ptr will be zero and this is all a big
195 if (reg_ptr
> core_reg_size
)
196 reg_ptr
-= KERNEL_U_ADDR
;
198 for (regno
= 0; regno
< NUM_REGS
; regno
++)
200 addr
= register_addr (regno
, reg_ptr
);
201 if (addr
>= core_reg_size
) {
205 supply_register (regno
, core_reg_sect
+ addr
);
210 error ("Register %s not found in core file.", reg_names
[bad_reg
]);
212 supply_register (ZERO_REGNUM
, zerobuf
);
213 /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
214 supply_register (FP_REGNUM
, zerobuf
);
217 /* Return the address in the core dump or inferior of register REGNO.
218 BLOCKEND is the address of the end of the user structure. */
221 register_addr (regno
, blockend
)
227 if (regno
< 0 || regno
>= NUM_REGS
)
228 error ("Invalid register number %d.", regno
);
230 REGISTER_U_ADDR (addr
, blockend
, regno
);
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