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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 | ||
36 | static void fetch_osf_core_registers PARAMS ((char *, | |
37 | unsigned, int, CORE_ADDR)); | |
38 | static void fetch_elf_core_registers PARAMS ((char *, | |
39 | unsigned, int, CORE_ADDR)); | |
40 | ||
41 | /* Size of elements in jmpbuf */ | |
42 | ||
43 | #define JB_ELEMENT_SIZE 8 | |
44 | ||
45 | /* The definition for JB_PC in machine/reg.h is wrong. | |
46 | And we can't get at the correct definition in setjmp.h as it is | |
47 | not always available (eg. if _POSIX_SOURCE is defined which is the | |
48 | default). As the defintion is unlikely to change (see comment | |
49 | in <setjmp.h>, define the correct value here. */ | |
50 | ||
51 | #undef JB_PC | |
52 | #define JB_PC 2 | |
53 | ||
54 | /* Figure out where the longjmp will land. | |
55 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
56 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
57 | This routine returns true on success. */ | |
58 | ||
59 | int | |
60 | get_longjmp_target (pc) | |
61 | CORE_ADDR *pc; | |
62 | { | |
63 | CORE_ADDR jb_addr; | |
64 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
65 | ||
c5aa993b | 66 | jb_addr = read_register (A0_REGNUM); |
c906108c | 67 | |
c5aa993b JM |
68 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer, |
69 | sizeof (CORE_ADDR))) | |
c906108c SS |
70 | return 0; |
71 | ||
c5aa993b | 72 | *pc = extract_address (raw_buffer, sizeof (CORE_ADDR)); |
c906108c SS |
73 | return 1; |
74 | } | |
75 | ||
76 | /* Extract the register values out of the core file and store | |
77 | them where `read_register' will find them. | |
78 | ||
79 | CORE_REG_SECT points to the register values themselves, read into memory. | |
80 | CORE_REG_SIZE is the size of that area. | |
81 | WHICH says which set of registers we are handling (0 = int, 2 = float | |
c5aa993b | 82 | on machines where they are discontiguous). |
c906108c | 83 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
c5aa993b JM |
84 | core_reg_sect. This is used with old-fashioned core files to |
85 | locate the registers in a large upage-plus-stack ".reg" section. | |
86 | Original upage address X is at location core_reg_sect+x+reg_addr. | |
c906108c SS |
87 | */ |
88 | ||
89 | static void | |
90 | fetch_osf_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
91 | char *core_reg_sect; | |
92 | unsigned core_reg_size; | |
93 | int which; | |
94 | CORE_ADDR reg_addr; | |
95 | { | |
96 | register int regno; | |
97 | register int addr; | |
98 | int bad_reg = -1; | |
99 | ||
100 | /* Table to map a gdb regnum to an index in the core register section. | |
101 | The floating point register values are garbage in OSF/1.2 core files. */ | |
102 | static int core_reg_mapping[NUM_REGS] = | |
103 | { | |
104 | #define EFL (EF_SIZE / 8) | |
c5aa993b JM |
105 | EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6, |
106 | EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6, | |
107 | EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9, | |
108 | EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1, | |
109 | EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7, | |
110 | EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15, | |
111 | EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23, | |
112 | EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31, | |
113 | EF_PC, -1 | |
c906108c | 114 | }; |
c5aa993b JM |
115 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = |
116 | {0}; | |
c906108c SS |
117 | |
118 | for (regno = 0; regno < NUM_REGS; regno++) | |
119 | { | |
120 | if (CANNOT_FETCH_REGISTER (regno)) | |
121 | { | |
122 | supply_register (regno, zerobuf); | |
123 | continue; | |
124 | } | |
125 | addr = 8 * core_reg_mapping[regno]; | |
126 | if (addr < 0 || addr >= core_reg_size) | |
127 | { | |
128 | if (bad_reg < 0) | |
129 | bad_reg = regno; | |
130 | } | |
131 | else | |
132 | { | |
133 | supply_register (regno, core_reg_sect + addr); | |
134 | } | |
135 | } | |
136 | if (bad_reg >= 0) | |
137 | { | |
138 | error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); | |
139 | } | |
140 | } | |
141 | ||
142 | static void | |
143 | fetch_elf_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
144 | char *core_reg_sect; | |
145 | unsigned core_reg_size; | |
146 | int which; | |
147 | CORE_ADDR reg_addr; | |
148 | { | |
c5aa993b | 149 | if (core_reg_size < 32 * 8) |
c906108c SS |
150 | { |
151 | error ("Core file register section too small (%u bytes).", core_reg_size); | |
152 | return; | |
153 | } | |
154 | ||
155 | if (which == 2) | |
156 | { | |
157 | /* The FPU Registers. */ | |
c5aa993b JM |
158 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31 * 8); |
159 | memset (®isters[REGISTER_BYTE (FP0_REGNUM + 31)], 0, 8); | |
c906108c SS |
160 | memset (®ister_valid[FP0_REGNUM], 1, 32); |
161 | } | |
162 | else | |
163 | { | |
164 | /* The General Registers. */ | |
c5aa993b JM |
165 | memcpy (®isters[REGISTER_BYTE (V0_REGNUM)], core_reg_sect, 31 * 8); |
166 | memcpy (®isters[REGISTER_BYTE (PC_REGNUM)], core_reg_sect + 31 * 8, 8); | |
c906108c SS |
167 | memset (®isters[REGISTER_BYTE (ZERO_REGNUM)], 0, 8); |
168 | memset (®ister_valid[V0_REGNUM], 1, 32); | |
169 | register_valid[PC_REGNUM] = 1; | |
170 | } | |
171 | } | |
172 | ||
173 | ||
174 | /* Map gdb internal register number to a ptrace ``address''. | |
175 | These ``addresses'' are defined in <sys/ptrace.h> */ | |
176 | ||
177 | #define REGISTER_PTRACE_ADDR(regno) \ | |
178 | (regno < FP0_REGNUM ? GPR_BASE + (regno) \ | |
179 | : regno == PC_REGNUM ? PC \ | |
180 | : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \ | |
181 | : 0) | |
182 | ||
183 | /* Return the ptrace ``address'' of register REGNO. */ | |
184 | ||
185 | CORE_ADDR | |
186 | register_addr (regno, blockend) | |
187 | int regno; | |
188 | CORE_ADDR blockend; | |
189 | { | |
190 | return REGISTER_PTRACE_ADDR (regno); | |
191 | } | |
192 | ||
193 | int | |
194 | kernel_u_size () | |
195 | { | |
196 | return (sizeof (struct user)); | |
197 | } | |
198 | ||
199 | #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T) | |
200 | #include <sys/procfs.h> | |
201 | ||
202 | /* | |
203 | * See the comment in m68k-tdep.c regarding the utility of these functions. | |
204 | */ | |
205 | ||
c5aa993b | 206 | void |
c906108c SS |
207 | supply_gregset (gregsetp) |
208 | gregset_t *gregsetp; | |
209 | { | |
210 | register int regi; | |
211 | register long *regp = ALPHA_REGSET_BASE (gregsetp); | |
c5aa993b JM |
212 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = |
213 | {0}; | |
c906108c SS |
214 | |
215 | for (regi = 0; regi < 31; regi++) | |
c5aa993b | 216 | supply_register (regi, (char *) (regp + regi)); |
c906108c | 217 | |
c5aa993b | 218 | supply_register (PC_REGNUM, (char *) (regp + 31)); |
c906108c SS |
219 | |
220 | /* Fill inaccessible registers with zero. */ | |
221 | supply_register (ZERO_REGNUM, zerobuf); | |
222 | supply_register (FP_REGNUM, zerobuf); | |
223 | } | |
224 | ||
225 | void | |
226 | fill_gregset (gregsetp, regno) | |
227 | gregset_t *gregsetp; | |
228 | int regno; | |
229 | { | |
230 | int regi; | |
231 | register long *regp = ALPHA_REGSET_BASE (gregsetp); | |
232 | ||
233 | for (regi = 0; regi < 31; regi++) | |
234 | if ((regno == -1) || (regno == regi)) | |
235 | *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)]; | |
236 | ||
237 | if ((regno == -1) || (regno == PC_REGNUM)) | |
238 | *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)]; | |
239 | } | |
240 | ||
241 | /* | |
242 | * Now we do the same thing for floating-point registers. | |
243 | * Again, see the comments in m68k-tdep.c. | |
244 | */ | |
245 | ||
246 | void | |
247 | supply_fpregset (fpregsetp) | |
248 | fpregset_t *fpregsetp; | |
249 | { | |
250 | register int regi; | |
251 | register long *regp = ALPHA_REGSET_BASE (fpregsetp); | |
252 | ||
253 | for (regi = 0; regi < 32; regi++) | |
c5aa993b | 254 | supply_register (regi + FP0_REGNUM, (char *) (regp + regi)); |
c906108c SS |
255 | } |
256 | ||
257 | void | |
258 | fill_fpregset (fpregsetp, regno) | |
259 | fpregset_t *fpregsetp; | |
260 | int regno; | |
261 | { | |
262 | int regi; | |
263 | register long *regp = ALPHA_REGSET_BASE (fpregsetp); | |
264 | ||
265 | for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) | |
266 | { | |
267 | if ((regno == -1) || (regno == regi)) | |
268 | { | |
269 | *(regp + regi - FP0_REGNUM) = | |
270 | *(long *) ®isters[REGISTER_BYTE (regi)]; | |
271 | } | |
272 | } | |
273 | } | |
274 | #endif | |
c906108c | 275 | \f |
c5aa993b | 276 | |
c906108c SS |
277 | /* Register that we are able to handle alpha core file formats. */ |
278 | ||
279 | static struct core_fns alpha_osf_core_fns = | |
280 | { | |
281 | /* This really is bfd_target_unknown_flavour. */ | |
282 | ||
283 | bfd_target_unknown_flavour, | |
284 | fetch_osf_core_registers, | |
285 | NULL | |
286 | }; | |
287 | ||
288 | static struct core_fns alpha_elf_core_fns = | |
289 | { | |
290 | bfd_target_elf_flavour, | |
291 | fetch_elf_core_registers, | |
292 | NULL | |
293 | }; | |
294 | ||
295 | void | |
296 | _initialize_core_alpha () | |
297 | { | |
298 | add_core_fns (&alpha_osf_core_fns); | |
299 | add_core_fns (&alpha_elf_core_fns); | |
300 | } |