Commit | Line | Data |
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c906108c | 1 | /* Low level DECstation interface to ptrace, for GDB when running native. |
b6ba6518 KB |
2 | Copyright 1988, 1989, 1991, 1992, 1993, 1995, 1996, 1999, 2000, 2001 |
3 | Free Software Foundation, Inc. | |
c906108c SS |
4 | Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU |
5 | and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. | |
6 | ||
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
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. | |
c906108c | 13 | |
c5aa993b JM |
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. | |
c906108c | 18 | |
c5aa993b JM |
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. */ | |
c906108c SS |
23 | |
24 | #include "defs.h" | |
25 | #include "inferior.h" | |
26 | #include "gdbcore.h" | |
4e052eda | 27 | #include "regcache.h" |
c906108c SS |
28 | #include <sys/ptrace.h> |
29 | #include <sys/types.h> | |
30 | #include <sys/param.h> | |
31 | #include <sys/user.h> | |
32 | #undef JB_S0 | |
33 | #undef JB_S1 | |
34 | #undef JB_S2 | |
35 | #undef JB_S3 | |
36 | #undef JB_S4 | |
37 | #undef JB_S5 | |
38 | #undef JB_S6 | |
39 | #undef JB_S7 | |
40 | #undef JB_SP | |
41 | #undef JB_S8 | |
42 | #undef JB_PC | |
43 | #undef JB_SR | |
44 | #undef NJBREGS | |
45 | #include <setjmp.h> /* For JB_XXX. */ | |
46 | ||
47 | /* Size of elements in jmpbuf */ | |
48 | ||
49 | #define JB_ELEMENT_SIZE 4 | |
50 | ||
51 | /* Map gdb internal register number to ptrace ``address''. | |
52 | These ``addresses'' are defined in DECstation <sys/ptrace.h> */ | |
53 | ||
92b3541e KB |
54 | static int |
55 | register_ptrace_addr (int regno) | |
56 | { | |
57 | return (regno < 32 ? GPR_BASE + regno | |
56cea623 AC |
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 | |
92b3541e KB |
64 | : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) |
65 | : 0); | |
66 | } | |
c906108c | 67 | |
a14ed312 | 68 | static void fetch_core_registers (char *, unsigned, int, CORE_ADDR); |
c906108c SS |
69 | |
70 | /* Get all registers from the inferior */ | |
71 | ||
72 | void | |
fba45db2 | 73 | fetch_inferior_registers (int regno) |
c906108c | 74 | { |
52f0bd74 | 75 | unsigned int regaddr; |
123a958e | 76 | char buf[MAX_REGISTER_SIZE]; |
52f0bd74 | 77 | int i; |
123a958e AC |
78 | char zerobuf[MAX_REGISTER_SIZE]; |
79 | memset (zerobuf, 0, MAX_REGISTER_SIZE); | |
c906108c | 80 | |
2b9e5f3f | 81 | deprecated_registers_fetched (); |
c906108c SS |
82 | |
83 | for (regno = 1; regno < NUM_REGS; regno++) | |
84 | { | |
92b3541e | 85 | regaddr = register_ptrace_addr (regno); |
12c266ea | 86 | for (i = 0; i < DEPRECATED_REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
c5aa993b | 87 | { |
39f77062 | 88 | *(int *) &buf[i] = ptrace (PT_READ_U, PIDGET (inferior_ptid), |
c906108c | 89 | (PTRACE_ARG3_TYPE) regaddr, 0); |
c5aa993b JM |
90 | regaddr += sizeof (int); |
91 | } | |
c906108c SS |
92 | supply_register (regno, buf); |
93 | } | |
94 | ||
95 | supply_register (ZERO_REGNUM, zerobuf); | |
96 | /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ | |
0ba6dca9 | 97 | supply_register (DEPRECATED_FP_REGNUM, zerobuf); |
c906108c SS |
98 | } |
99 | ||
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). */ | |
103 | ||
104 | void | |
fba45db2 | 105 | store_inferior_registers (int regno) |
c906108c | 106 | { |
52f0bd74 | 107 | unsigned int regaddr; |
c906108c SS |
108 | char buf[80]; |
109 | ||
110 | if (regno > 0) | |
111 | { | |
112 | if (regno == ZERO_REGNUM || regno == PS_REGNUM | |
56cea623 AC |
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 | |
c906108c SS |
117 | || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM)) |
118 | return; | |
92b3541e | 119 | regaddr = register_ptrace_addr (regno); |
c906108c | 120 | errno = 0; |
39f77062 | 121 | ptrace (PT_WRITE_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) regaddr, |
c906108c SS |
122 | read_register (regno)); |
123 | if (errno != 0) | |
124 | { | |
125 | sprintf (buf, "writing register number %d", regno); | |
126 | perror_with_name (buf); | |
127 | } | |
128 | } | |
129 | else | |
130 | { | |
131 | for (regno = 0; regno < NUM_REGS; regno++) | |
132 | store_inferior_registers (regno); | |
133 | } | |
134 | } | |
135 | ||
136 | ||
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. */ | |
141 | ||
142 | int | |
fba45db2 | 143 | get_longjmp_target (CORE_ADDR *pc) |
c906108c SS |
144 | { |
145 | CORE_ADDR jb_addr; | |
35fc8285 | 146 | char *buf; |
c906108c | 147 | |
35fc8285 | 148 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c SS |
149 | jb_addr = read_register (A0_REGNUM); |
150 | ||
151 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
152 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
153 | return 0; | |
154 | ||
7c0b4a20 | 155 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c SS |
156 | |
157 | return 1; | |
158 | } | |
159 | ||
160 | /* Extract the register values out of the core file and store | |
161 | them where `read_register' will find them. | |
162 | ||
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 | |
c5aa993b | 166 | on machines where they are discontiguous). |
c906108c | 167 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
c5aa993b JM |
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. | |
c906108c SS |
171 | */ |
172 | ||
173 | static void | |
fba45db2 KB |
174 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
175 | CORE_ADDR reg_addr) | |
c906108c | 176 | { |
52f0bd74 AC |
177 | int regno; |
178 | unsigned int addr; | |
c906108c | 179 | int bad_reg = -1; |
52f0bd74 | 180 | reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ |
c906108c | 181 | |
123a958e AC |
182 | char zerobuf[MAX_REGISTER_SIZE]; |
183 | memset (zerobuf, 0, MAX_REGISTER_SIZE); | |
6789195b AC |
184 | |
185 | ||
c906108c SS |
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 | |
191 | NOP. */ | |
192 | if (reg_ptr > core_reg_size) | |
193 | #ifdef KERNEL_U_ADDR | |
194 | reg_ptr -= KERNEL_U_ADDR; | |
195 | #else | |
196 | error ("Old mips core file can't be processed on this machine."); | |
197 | #endif | |
198 | ||
199 | for (regno = 0; regno < NUM_REGS; regno++) | |
200 | { | |
201 | addr = register_addr (regno, reg_ptr); | |
c5aa993b JM |
202 | if (addr >= core_reg_size) |
203 | { | |
204 | if (bad_reg < 0) | |
205 | bad_reg = regno; | |
206 | } | |
207 | else | |
208 | { | |
209 | supply_register (regno, core_reg_sect + addr); | |
210 | } | |
c906108c SS |
211 | } |
212 | if (bad_reg >= 0) | |
213 | { | |
214 | error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); | |
215 | } | |
216 | supply_register (ZERO_REGNUM, zerobuf); | |
217 | /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ | |
0ba6dca9 | 218 | supply_register (DEPRECATED_FP_REGNUM, zerobuf); |
c906108c SS |
219 | } |
220 | ||
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. */ | |
223 | ||
224 | CORE_ADDR | |
fba45db2 | 225 | register_addr (int regno, CORE_ADDR blockend) |
c906108c SS |
226 | { |
227 | CORE_ADDR addr; | |
228 | ||
229 | if (regno < 0 || regno >= NUM_REGS) | |
230 | error ("Invalid register number %d.", regno); | |
231 | ||
232 | REGISTER_U_ADDR (addr, blockend, regno); | |
233 | ||
234 | return addr; | |
235 | } | |
c906108c | 236 | \f |
c5aa993b | 237 | |
c906108c SS |
238 | /* Register that we are able to handle mips core file formats. |
239 | FIXME: is this really bfd_target_unknown_flavour? */ | |
240 | ||
241 | static struct core_fns mips_core_fns = | |
242 | { | |
2acceee2 JM |
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 */ | |
247 | NULL /* next */ | |
c906108c SS |
248 | }; |
249 | ||
250 | void | |
fba45db2 | 251 | _initialize_core_mips (void) |
c906108c SS |
252 | { |
253 | add_core_fns (&mips_core_fns); | |
254 | } |