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c906108c SS |
1 | /* Low level DECstation interface to ptrace, for GDB when running native. |
2 | Copyright 1988, 1989, 1991, 1992, 1995 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. | |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
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. | |
c906108c | 12 | |
c5aa993b JM |
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. | |
c906108c | 17 | |
c5aa993b JM |
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., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "inferior.h" | |
25 | #include "gdbcore.h" | |
26 | #include <sys/ptrace.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/param.h> | |
29 | #include <sys/user.h> | |
30 | #undef JB_S0 | |
31 | #undef JB_S1 | |
32 | #undef JB_S2 | |
33 | #undef JB_S3 | |
34 | #undef JB_S4 | |
35 | #undef JB_S5 | |
36 | #undef JB_S6 | |
37 | #undef JB_S7 | |
38 | #undef JB_SP | |
39 | #undef JB_S8 | |
40 | #undef JB_PC | |
41 | #undef JB_SR | |
42 | #undef NJBREGS | |
43 | #include <setjmp.h> /* For JB_XXX. */ | |
44 | ||
45 | /* Size of elements in jmpbuf */ | |
46 | ||
47 | #define JB_ELEMENT_SIZE 4 | |
48 | ||
49 | /* Map gdb internal register number to ptrace ``address''. | |
50 | These ``addresses'' are defined in DECstation <sys/ptrace.h> */ | |
51 | ||
52 | #define REGISTER_PTRACE_ADDR(regno) \ | |
53 | (regno < 32 ? GPR_BASE + regno \ | |
54 | : regno == PC_REGNUM ? PC \ | |
55 | : regno == CAUSE_REGNUM ? CAUSE \ | |
56 | : regno == HI_REGNUM ? MMHI \ | |
57 | : regno == LO_REGNUM ? MMLO \ | |
58 | : regno == FCRCS_REGNUM ? FPC_CSR \ | |
59 | : regno == FCRIR_REGNUM ? FPC_EIR \ | |
60 | : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \ | |
61 | : 0) | |
62 | ||
c5aa993b JM |
63 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = |
64 | {0}; | |
c906108c SS |
65 | |
66 | static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR)); | |
67 | ||
68 | /* Get all registers from the inferior */ | |
69 | ||
70 | void | |
71 | fetch_inferior_registers (regno) | |
72 | int regno; | |
73 | { | |
74 | register unsigned int regaddr; | |
75 | char buf[MAX_REGISTER_RAW_SIZE]; | |
76 | register int i; | |
77 | ||
78 | registers_fetched (); | |
79 | ||
80 | for (regno = 1; regno < NUM_REGS; regno++) | |
81 | { | |
82 | regaddr = REGISTER_PTRACE_ADDR (regno); | |
83 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
c5aa993b JM |
84 | { |
85 | *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid, | |
c906108c | 86 | (PTRACE_ARG3_TYPE) regaddr, 0); |
c5aa993b JM |
87 | regaddr += sizeof (int); |
88 | } | |
c906108c SS |
89 | supply_register (regno, buf); |
90 | } | |
91 | ||
92 | supply_register (ZERO_REGNUM, zerobuf); | |
93 | /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ | |
94 | supply_register (FP_REGNUM, zerobuf); | |
95 | } | |
96 | ||
97 | /* Store our register values back into the inferior. | |
98 | If REGNO is -1, do this for all registers. | |
99 | Otherwise, REGNO specifies which register (so we can save time). */ | |
100 | ||
101 | void | |
102 | store_inferior_registers (regno) | |
103 | int regno; | |
104 | { | |
105 | register unsigned int regaddr; | |
106 | char buf[80]; | |
107 | ||
108 | if (regno > 0) | |
109 | { | |
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)) | |
114 | return; | |
115 | regaddr = REGISTER_PTRACE_ADDR (regno); | |
116 | errno = 0; | |
117 | ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
118 | read_register (regno)); | |
119 | if (errno != 0) | |
120 | { | |
121 | sprintf (buf, "writing register number %d", regno); | |
122 | perror_with_name (buf); | |
123 | } | |
124 | } | |
125 | else | |
126 | { | |
127 | for (regno = 0; regno < NUM_REGS; regno++) | |
128 | store_inferior_registers (regno); | |
129 | } | |
130 | } | |
131 | ||
132 | ||
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. */ | |
137 | ||
138 | int | |
c5aa993b | 139 | get_longjmp_target (pc) |
c906108c SS |
140 | CORE_ADDR *pc; |
141 | { | |
142 | CORE_ADDR jb_addr; | |
143 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; | |
144 | ||
145 | jb_addr = read_register (A0_REGNUM); | |
146 | ||
147 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
148 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
149 | return 0; | |
150 | ||
151 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
152 | ||
153 | return 1; | |
154 | } | |
155 | ||
156 | /* Extract the register values out of the core file and store | |
157 | them where `read_register' will find them. | |
158 | ||
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 | |
c5aa993b | 162 | on machines where they are discontiguous). |
c906108c | 163 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
c5aa993b JM |
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. | |
c906108c SS |
167 | */ |
168 | ||
169 | static void | |
170 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
171 | char *core_reg_sect; | |
172 | unsigned core_reg_size; | |
173 | int which; | |
174 | CORE_ADDR reg_addr; | |
175 | { | |
176 | register int regno; | |
177 | register unsigned int addr; | |
178 | int bad_reg = -1; | |
c5aa993b | 179 | register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ |
c906108c SS |
180 | |
181 | /* If u.u_ar0 was an absolute address in the core file, relativize it now, | |
182 | so we can use it as an offset into core_reg_sect. When we're done, | |
183 | "register 0" will be at core_reg_sect+reg_ptr, and we can use | |
184 | register_addr to offset to the other registers. If this is a modern | |
185 | core file without a upage, reg_ptr will be zero and this is all a big | |
186 | NOP. */ | |
187 | if (reg_ptr > core_reg_size) | |
188 | #ifdef KERNEL_U_ADDR | |
189 | reg_ptr -= KERNEL_U_ADDR; | |
190 | #else | |
191 | error ("Old mips core file can't be processed on this machine."); | |
192 | #endif | |
193 | ||
194 | for (regno = 0; regno < NUM_REGS; regno++) | |
195 | { | |
196 | addr = register_addr (regno, reg_ptr); | |
c5aa993b JM |
197 | if (addr >= core_reg_size) |
198 | { | |
199 | if (bad_reg < 0) | |
200 | bad_reg = regno; | |
201 | } | |
202 | else | |
203 | { | |
204 | supply_register (regno, core_reg_sect + addr); | |
205 | } | |
c906108c SS |
206 | } |
207 | if (bad_reg >= 0) | |
208 | { | |
209 | error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); | |
210 | } | |
211 | supply_register (ZERO_REGNUM, zerobuf); | |
212 | /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ | |
213 | supply_register (FP_REGNUM, zerobuf); | |
214 | } | |
215 | ||
216 | /* Return the address in the core dump or inferior of register REGNO. | |
217 | BLOCKEND is the address of the end of the user structure. */ | |
218 | ||
219 | CORE_ADDR | |
220 | register_addr (regno, blockend) | |
221 | int regno; | |
222 | CORE_ADDR blockend; | |
223 | { | |
224 | CORE_ADDR addr; | |
225 | ||
226 | if (regno < 0 || regno >= NUM_REGS) | |
227 | error ("Invalid register number %d.", regno); | |
228 | ||
229 | REGISTER_U_ADDR (addr, blockend, regno); | |
230 | ||
231 | return addr; | |
232 | } | |
c906108c | 233 | \f |
c5aa993b | 234 | |
c906108c SS |
235 | /* Register that we are able to handle mips core file formats. |
236 | FIXME: is this really bfd_target_unknown_flavour? */ | |
237 | ||
238 | static struct core_fns mips_core_fns = | |
239 | { | |
2acceee2 JM |
240 | bfd_target_unknown_flavour, /* core_flavour */ |
241 | default_check_format, /* check_format */ | |
242 | default_core_sniffer, /* core_sniffer */ | |
243 | fetch_core_registers, /* core_read_registers */ | |
244 | NULL /* next */ | |
c906108c SS |
245 | }; |
246 | ||
247 | void | |
248 | _initialize_core_mips () | |
249 | { | |
250 | add_core_fns (&mips_core_fns); | |
251 | } |