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> */
55 register_ptrace_addr (int regno)
57 return (regno < 32 ? GPR_BASE + regno
58 : regno == mips_regnum (current_gdbarch)->pc ? PC
59 : regno == mips_regnum (current_gdbarch)->cause ? CAUSE
60 : regno == mips_regnum (current_gdbarch)->hi ? MMHI
61 : regno == mips_regnum (current_gdbarch)->lo ? MMLO
62 : regno == mips_regnum (current_gdbarch)->fp_control_status ? FPC_CSR
63 : regno == mips_regnum (current_gdbarch)->fp_implementation_revision ? FPC_EIR
64 : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM)
68 static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
70 /* Get all registers from the inferior */
73 fetch_inferior_registers (int regno)
76 char buf[MAX_REGISTER_SIZE];
78 char zerobuf[MAX_REGISTER_SIZE];
79 memset (zerobuf, 0, MAX_REGISTER_SIZE);
81 deprecated_registers_fetched ();
83 for (regno = 1; regno < NUM_REGS; regno++)
85 regaddr = register_ptrace_addr (regno);
86 for (i = 0; i < DEPRECATED_REGISTER_RAW_SIZE (regno); i += sizeof (int))
88 *(int *) &buf[i] = ptrace (PT_READ_U, PIDGET (inferior_ptid),
89 (PTRACE_ARG3_TYPE) regaddr, 0);
90 regaddr += sizeof (int);
92 regcache_raw_supply (current_regcache, regno, buf);
95 regcache_raw_supply (current_regcache, ZERO_REGNUM, zerobuf);
96 /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
97 regcache_raw_supply (current_regcache, DEPRECATED_FP_REGNUM, zerobuf);
100 /* Store our register values back into the inferior.
101 If REGNO is -1, do this for all registers.
102 Otherwise, REGNO specifies which register (so we can save time). */
105 store_inferior_registers (int regno)
107 unsigned int regaddr;
112 if (regno == ZERO_REGNUM || regno == PS_REGNUM
113 || regno == mips_regnum (current_gdbarch)->badvaddr
114 || regno == mips_regnum (current_gdbarch)->cause
115 || regno == mips_regnum (current_gdbarch)->fp_implementation_revision
116 || regno == DEPRECATED_FP_REGNUM
117 || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM))
119 regaddr = register_ptrace_addr (regno);
121 ptrace (PT_WRITE_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) regaddr,
122 read_register (regno));
125 sprintf (buf, "writing register number %d", regno);
126 perror_with_name (buf);
131 for (regno = 0; regno < NUM_REGS; regno++)
132 store_inferior_registers (regno);
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 (CORE_ADDR *pc)
148 buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
149 jb_addr = read_register (A0_REGNUM);
151 if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
152 TARGET_PTR_BIT / TARGET_CHAR_BIT))
155 *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
160 /* Extract the register values out of the core file and store
161 them where `read_register' will find them.
163 CORE_REG_SECT points to the register values themselves, read into memory.
164 CORE_REG_SIZE is the size of that area.
165 WHICH says which set of registers we are handling (0 = int, 2 = float
166 on machines where they are discontiguous).
167 REG_ADDR is the offset from u.u_ar0 to the register values relative to
168 core_reg_sect. This is used with old-fashioned core files to
169 locate the registers in a large upage-plus-stack ".reg" section.
170 Original upage address X is at location core_reg_sect+x+reg_addr.
174 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
180 reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */
182 char zerobuf[MAX_REGISTER_SIZE];
183 memset (zerobuf, 0, MAX_REGISTER_SIZE);
186 /* If u.u_ar0 was an absolute address in the core file, relativize it now,
187 so we can use it as an offset into core_reg_sect. When we're done,
188 "register 0" will be at core_reg_sect+reg_ptr, and we can use
189 register_addr to offset to the other registers. If this is a modern
190 core file without a upage, reg_ptr will be zero and this is all a big
192 if (reg_ptr > core_reg_size)
194 reg_ptr -= KERNEL_U_ADDR;
196 error ("Old mips core file can't be processed on this machine.");
199 for (regno = 0; regno < NUM_REGS; regno++)
201 addr = register_addr (regno, reg_ptr);
202 if (addr >= core_reg_size)
209 regcache_raw_supply (current_regcache, regno, core_reg_sect + addr);
214 error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
216 regcache_raw_supply (current_regcache, ZERO_REGNUM, zerobuf);
217 /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
218 regcache_raw_supply (current_regcache, DEPRECATED_FP_REGNUM, zerobuf);
221 /* Return the address in the core dump or inferior of register REGNO.
222 BLOCKEND is the address of the end of the user structure. */
225 register_addr (int regno, CORE_ADDR blockend)
229 if (regno < 0 || regno >= NUM_REGS)
230 error ("Invalid register number %d.", regno);
232 REGISTER_U_ADDR (addr, blockend, regno);
238 /* Register that we are able to handle mips core file formats.
239 FIXME: is this really bfd_target_unknown_flavour? */
241 static struct core_fns mips_core_fns =
243 bfd_target_unknown_flavour, /* core_flavour */
244 default_check_format, /* check_format */
245 default_core_sniffer, /* core_sniffer */
246 fetch_core_registers, /* core_read_registers */
251 _initialize_core_mips (void)
253 deprecated_add_core_fns (&mips_core_fns);