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c906108c SS |
1 | /* Low level Alpha interface, for GDB when running native. |
2 | Copyright 1993, 1995, 1996, 1998 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "gdbcore.h" | |
24 | #include "target.h" | |
25 | #include <sys/ptrace.h> | |
26 | #ifdef __linux__ | |
c5aa993b JM |
27 | #include <asm/reg.h> |
28 | #include <alpha/ptrace.h> | |
c906108c | 29 | #else |
c5aa993b | 30 | #include <machine/reg.h> |
c906108c SS |
31 | #endif |
32 | #include <sys/user.h> | |
33 | ||
34 | /* Prototypes for local functions. */ | |
35 | ||
a14ed312 KB |
36 | static void fetch_osf_core_registers (char *, unsigned, int, CORE_ADDR); |
37 | static void fetch_elf_core_registers (char *, unsigned, int, CORE_ADDR); | |
c906108c SS |
38 | |
39 | /* Size of elements in jmpbuf */ | |
40 | ||
41 | #define JB_ELEMENT_SIZE 8 | |
42 | ||
43 | /* The definition for JB_PC in machine/reg.h is wrong. | |
44 | And we can't get at the correct definition in setjmp.h as it is | |
45 | not always available (eg. if _POSIX_SOURCE is defined which is the | |
46 | default). As the defintion is unlikely to change (see comment | |
47 | in <setjmp.h>, define the correct value here. */ | |
48 | ||
49 | #undef JB_PC | |
50 | #define JB_PC 2 | |
51 | ||
52 | /* Figure out where the longjmp will land. | |
53 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
54 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
55 | This routine returns true on success. */ | |
56 | ||
57 | int | |
58 | get_longjmp_target (pc) | |
59 | CORE_ADDR *pc; | |
60 | { | |
61 | CORE_ADDR jb_addr; | |
62 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
63 | ||
c5aa993b | 64 | jb_addr = read_register (A0_REGNUM); |
c906108c | 65 | |
c5aa993b JM |
66 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer, |
67 | sizeof (CORE_ADDR))) | |
c906108c SS |
68 | return 0; |
69 | ||
c5aa993b | 70 | *pc = extract_address (raw_buffer, sizeof (CORE_ADDR)); |
c906108c SS |
71 | return 1; |
72 | } | |
73 | ||
74 | /* Extract the register values out of the core file and store | |
75 | them where `read_register' will find them. | |
76 | ||
77 | CORE_REG_SECT points to the register values themselves, read into memory. | |
78 | CORE_REG_SIZE is the size of that area. | |
79 | WHICH says which set of registers we are handling (0 = int, 2 = float | |
c5aa993b | 80 | on machines where they are discontiguous). |
c906108c | 81 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
c5aa993b JM |
82 | core_reg_sect. This is used with old-fashioned core files to |
83 | locate the registers in a large upage-plus-stack ".reg" section. | |
84 | Original upage address X is at location core_reg_sect+x+reg_addr. | |
c906108c SS |
85 | */ |
86 | ||
87 | static void | |
88 | fetch_osf_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
89 | char *core_reg_sect; | |
90 | unsigned core_reg_size; | |
91 | int which; | |
92 | CORE_ADDR reg_addr; | |
93 | { | |
94 | register int regno; | |
95 | register int addr; | |
96 | int bad_reg = -1; | |
97 | ||
98 | /* Table to map a gdb regnum to an index in the core register section. | |
99 | The floating point register values are garbage in OSF/1.2 core files. */ | |
100 | static int core_reg_mapping[NUM_REGS] = | |
101 | { | |
102 | #define EFL (EF_SIZE / 8) | |
c5aa993b JM |
103 | EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6, |
104 | EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6, | |
105 | EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9, | |
106 | EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1, | |
107 | EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7, | |
108 | EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15, | |
109 | EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23, | |
110 | EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31, | |
111 | EF_PC, -1 | |
c906108c | 112 | }; |
c5aa993b JM |
113 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = |
114 | {0}; | |
c906108c SS |
115 | |
116 | for (regno = 0; regno < NUM_REGS; regno++) | |
117 | { | |
118 | if (CANNOT_FETCH_REGISTER (regno)) | |
119 | { | |
120 | supply_register (regno, zerobuf); | |
121 | continue; | |
122 | } | |
123 | addr = 8 * core_reg_mapping[regno]; | |
124 | if (addr < 0 || addr >= core_reg_size) | |
125 | { | |
126 | if (bad_reg < 0) | |
127 | bad_reg = regno; | |
128 | } | |
129 | else | |
130 | { | |
131 | supply_register (regno, core_reg_sect + addr); | |
132 | } | |
133 | } | |
134 | if (bad_reg >= 0) | |
135 | { | |
136 | error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); | |
137 | } | |
138 | } | |
139 | ||
140 | static void | |
141 | fetch_elf_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
142 | char *core_reg_sect; | |
143 | unsigned core_reg_size; | |
144 | int which; | |
145 | CORE_ADDR reg_addr; | |
146 | { | |
c5aa993b | 147 | if (core_reg_size < 32 * 8) |
c906108c SS |
148 | { |
149 | error ("Core file register section too small (%u bytes).", core_reg_size); | |
150 | return; | |
151 | } | |
152 | ||
153 | if (which == 2) | |
154 | { | |
155 | /* The FPU Registers. */ | |
c5aa993b JM |
156 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31 * 8); |
157 | memset (®isters[REGISTER_BYTE (FP0_REGNUM + 31)], 0, 8); | |
c906108c SS |
158 | memset (®ister_valid[FP0_REGNUM], 1, 32); |
159 | } | |
160 | else | |
161 | { | |
162 | /* The General Registers. */ | |
c5aa993b JM |
163 | memcpy (®isters[REGISTER_BYTE (V0_REGNUM)], core_reg_sect, 31 * 8); |
164 | memcpy (®isters[REGISTER_BYTE (PC_REGNUM)], core_reg_sect + 31 * 8, 8); | |
c906108c SS |
165 | memset (®isters[REGISTER_BYTE (ZERO_REGNUM)], 0, 8); |
166 | memset (®ister_valid[V0_REGNUM], 1, 32); | |
167 | register_valid[PC_REGNUM] = 1; | |
168 | } | |
169 | } | |
170 | ||
171 | ||
172 | /* Map gdb internal register number to a ptrace ``address''. | |
173 | These ``addresses'' are defined in <sys/ptrace.h> */ | |
174 | ||
175 | #define REGISTER_PTRACE_ADDR(regno) \ | |
176 | (regno < FP0_REGNUM ? GPR_BASE + (regno) \ | |
177 | : regno == PC_REGNUM ? PC \ | |
178 | : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \ | |
179 | : 0) | |
180 | ||
181 | /* Return the ptrace ``address'' of register REGNO. */ | |
182 | ||
183 | CORE_ADDR | |
184 | register_addr (regno, blockend) | |
185 | int regno; | |
186 | CORE_ADDR blockend; | |
187 | { | |
188 | return REGISTER_PTRACE_ADDR (regno); | |
189 | } | |
190 | ||
191 | int | |
192 | kernel_u_size () | |
193 | { | |
194 | return (sizeof (struct user)); | |
195 | } | |
196 | ||
197 | #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T) | |
198 | #include <sys/procfs.h> | |
199 | ||
c60c0f5f MS |
200 | /* Prototypes for supply_gregset etc. */ |
201 | #include "gregset.h" | |
202 | ||
c906108c SS |
203 | /* |
204 | * See the comment in m68k-tdep.c regarding the utility of these functions. | |
205 | */ | |
206 | ||
c5aa993b | 207 | void |
c906108c SS |
208 | supply_gregset (gregsetp) |
209 | gregset_t *gregsetp; | |
210 | { | |
211 | register int regi; | |
212 | register long *regp = ALPHA_REGSET_BASE (gregsetp); | |
c5aa993b JM |
213 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = |
214 | {0}; | |
c906108c SS |
215 | |
216 | for (regi = 0; regi < 31; regi++) | |
c5aa993b | 217 | supply_register (regi, (char *) (regp + regi)); |
c906108c | 218 | |
c5aa993b | 219 | supply_register (PC_REGNUM, (char *) (regp + 31)); |
c906108c SS |
220 | |
221 | /* Fill inaccessible registers with zero. */ | |
222 | supply_register (ZERO_REGNUM, zerobuf); | |
223 | supply_register (FP_REGNUM, zerobuf); | |
224 | } | |
225 | ||
226 | void | |
227 | fill_gregset (gregsetp, regno) | |
228 | gregset_t *gregsetp; | |
229 | int regno; | |
230 | { | |
231 | int regi; | |
232 | register long *regp = ALPHA_REGSET_BASE (gregsetp); | |
233 | ||
234 | for (regi = 0; regi < 31; regi++) | |
235 | if ((regno == -1) || (regno == regi)) | |
236 | *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)]; | |
237 | ||
238 | if ((regno == -1) || (regno == PC_REGNUM)) | |
239 | *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)]; | |
240 | } | |
241 | ||
242 | /* | |
243 | * Now we do the same thing for floating-point registers. | |
244 | * Again, see the comments in m68k-tdep.c. | |
245 | */ | |
246 | ||
247 | void | |
248 | supply_fpregset (fpregsetp) | |
249 | fpregset_t *fpregsetp; | |
250 | { | |
251 | register int regi; | |
252 | register long *regp = ALPHA_REGSET_BASE (fpregsetp); | |
253 | ||
254 | for (regi = 0; regi < 32; regi++) | |
c5aa993b | 255 | supply_register (regi + FP0_REGNUM, (char *) (regp + regi)); |
c906108c SS |
256 | } |
257 | ||
258 | void | |
259 | fill_fpregset (fpregsetp, regno) | |
260 | fpregset_t *fpregsetp; | |
261 | int regno; | |
262 | { | |
263 | int regi; | |
264 | register long *regp = ALPHA_REGSET_BASE (fpregsetp); | |
265 | ||
266 | for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) | |
267 | { | |
268 | if ((regno == -1) || (regno == regi)) | |
269 | { | |
270 | *(regp + regi - FP0_REGNUM) = | |
271 | *(long *) ®isters[REGISTER_BYTE (regi)]; | |
272 | } | |
273 | } | |
274 | } | |
275 | #endif | |
c906108c | 276 | \f |
c5aa993b | 277 | |
c906108c SS |
278 | /* Register that we are able to handle alpha core file formats. */ |
279 | ||
280 | static struct core_fns alpha_osf_core_fns = | |
281 | { | |
282 | /* This really is bfd_target_unknown_flavour. */ | |
283 | ||
2acceee2 JM |
284 | bfd_target_unknown_flavour, /* core_flavour */ |
285 | default_check_format, /* check_format */ | |
286 | default_core_sniffer, /* core_sniffer */ | |
287 | fetch_osf_core_registers, /* core_read_registers */ | |
288 | NULL /* next */ | |
c906108c SS |
289 | }; |
290 | ||
291 | static struct core_fns alpha_elf_core_fns = | |
292 | { | |
2acceee2 JM |
293 | bfd_target_elf_flavour, /* core_flavour */ |
294 | default_check_format, /* check_format */ | |
295 | default_core_sniffer, /* core_sniffer */ | |
296 | fetch_elf_core_registers, /* core_read_registers */ | |
297 | NULL /* next */ | |
c906108c SS |
298 | }; |
299 | ||
300 | void | |
301 | _initialize_core_alpha () | |
302 | { | |
303 | add_core_fns (&alpha_osf_core_fns); | |
304 | add_core_fns (&alpha_elf_core_fns); | |
305 | } |