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cef4c2e7 | 1 | /* Low level Alpha interface, for GDB when running native. |
716e3a4f | 2 | Copyright 1993, 1995, 1996, 1998 Free Software Foundation, Inc. |
cef4c2e7 PS |
3 | |
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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 | |
6c9638b4 | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
cef4c2e7 PS |
19 | |
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
22 | #include "gdbcore.h" | |
23 | #include "target.h" | |
24 | #include <sys/ptrace.h> | |
9391c997 FF |
25 | #ifdef __linux__ |
26 | # include <asm/reg.h> | |
27 | # include <alpha/ptrace.h> | |
28 | #else | |
29 | # include <machine/reg.h> | |
30 | #endif | |
7531f36e | 31 | #include <sys/user.h> |
cef4c2e7 | 32 | |
879c0417 JM |
33 | /* Prototypes for local functions. */ |
34 | ||
716e3a4f JM |
35 | static void fetch_osf_core_registers PARAMS ((char *, |
36 | unsigned, int, CORE_ADDR)); | |
37 | static void fetch_elf_core_registers PARAMS ((char *, | |
38 | unsigned, int, CORE_ADDR)); | |
b607efe7 | 39 | |
cef4c2e7 PS |
40 | /* Size of elements in jmpbuf */ |
41 | ||
42 | #define JB_ELEMENT_SIZE 8 | |
43 | ||
44 | /* The definition for JB_PC in machine/reg.h is wrong. | |
45 | And we can't get at the correct definition in setjmp.h as it is | |
46 | not always available (eg. if _POSIX_SOURCE is defined which is the | |
47 | default). As the defintion is unlikely to change (see comment | |
48 | in <setjmp.h>, define the correct value here. */ | |
49 | ||
50 | #undef JB_PC | |
51 | #define JB_PC 2 | |
52 | ||
53 | /* Figure out where the longjmp will land. | |
54 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
55 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
56 | This routine returns true on success. */ | |
57 | ||
58 | int | |
59 | get_longjmp_target (pc) | |
60 | CORE_ADDR *pc; | |
61 | { | |
62 | CORE_ADDR jb_addr; | |
63 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
64 | ||
65 | jb_addr = read_register(A0_REGNUM); | |
66 | ||
67 | if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer, | |
68 | sizeof(CORE_ADDR))) | |
69 | return 0; | |
70 | ||
71 | *pc = extract_address (raw_buffer, sizeof(CORE_ADDR)); | |
72 | return 1; | |
73 | } | |
74 | ||
75 | /* Extract the register values out of the core file and store | |
76 | them where `read_register' will find them. | |
77 | ||
78 | CORE_REG_SECT points to the register values themselves, read into memory. | |
79 | CORE_REG_SIZE is the size of that area. | |
80 | WHICH says which set of registers we are handling (0 = int, 2 = float | |
81 | on machines where they are discontiguous). | |
82 | REG_ADDR is the offset from u.u_ar0 to the register values relative to | |
83 | core_reg_sect. This is used with old-fashioned core files to | |
84 | locate the registers in a large upage-plus-stack ".reg" section. | |
85 | Original upage address X is at location core_reg_sect+x+reg_addr. | |
86 | */ | |
87 | ||
a1df8e78 | 88 | static void |
716e3a4f | 89 | fetch_osf_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
cef4c2e7 PS |
90 | char *core_reg_sect; |
91 | unsigned core_reg_size; | |
92 | int which; | |
948a9d92 | 93 | CORE_ADDR reg_addr; |
cef4c2e7 PS |
94 | { |
95 | register int regno; | |
96 | register int addr; | |
97 | int bad_reg = -1; | |
98 | ||
99 | /* Table to map a gdb regnum to an index in the core register section. | |
100 | The floating point register values are garbage in OSF/1.2 core files. */ | |
101 | static int core_reg_mapping[NUM_REGS] = | |
102 | { | |
103 | #define EFL (EF_SIZE / 8) | |
104 | EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6, | |
105 | EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6, | |
106 | EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9, | |
107 | EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1, | |
108 | EFL+0, EFL+1, EFL+2, EFL+3, EFL+4, EFL+5, EFL+6, EFL+7, | |
109 | EFL+8, EFL+9, EFL+10, EFL+11, EFL+12, EFL+13, EFL+14, EFL+15, | |
110 | EFL+16, EFL+17, EFL+18, EFL+19, EFL+20, EFL+21, EFL+22, EFL+23, | |
111 | EFL+24, EFL+25, EFL+26, EFL+27, EFL+28, EFL+29, EFL+30, EFL+31, | |
112 | EF_PC, -1 | |
113 | }; | |
114 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; | |
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 | { | |
d70a61e7 | 136 | error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); |
cef4c2e7 PS |
137 | } |
138 | } | |
139 | ||
ffa1f5b9 RH |
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 | { | |
147 | if (core_reg_size < 32*8) | |
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. */ | |
156 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31*8); | |
157 | memset (®isters[REGISTER_BYTE (FP0_REGNUM+31)], 0, 8); | |
158 | memset (®ister_valid[FP0_REGNUM], 1, 32); | |
159 | } | |
160 | else | |
161 | { | |
162 | /* The General Registers. */ | |
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); | |
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 | ||
cef4c2e7 PS |
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 | ||
948a9d92 | 183 | CORE_ADDR |
cef4c2e7 PS |
184 | register_addr (regno, blockend) |
185 | int regno; | |
948a9d92 | 186 | CORE_ADDR blockend; |
cef4c2e7 PS |
187 | { |
188 | return REGISTER_PTRACE_ADDR (regno); | |
189 | } | |
2592eef8 | 190 | |
7531f36e FF |
191 | int |
192 | kernel_u_size () | |
193 | { | |
194 | return (sizeof (struct user)); | |
195 | } | |
196 | ||
ffa1f5b9 | 197 | #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T) |
2592eef8 PS |
198 | #include <sys/procfs.h> |
199 | ||
200 | /* | |
201 | * See the comment in m68k-tdep.c regarding the utility of these functions. | |
202 | */ | |
203 | ||
204 | void | |
205 | supply_gregset (gregsetp) | |
206 | gregset_t *gregsetp; | |
207 | { | |
208 | register int regi; | |
ffa1f5b9 | 209 | register long *regp = ALPHA_REGSET_BASE (gregsetp); |
3f403f6a | 210 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; |
2592eef8 PS |
211 | |
212 | for (regi = 0; regi < 31; regi++) | |
213 | supply_register (regi, (char *)(regp + regi)); | |
214 | ||
215 | supply_register (PC_REGNUM, (char *)(regp + 31)); | |
3f403f6a PS |
216 | |
217 | /* Fill inaccessible registers with zero. */ | |
218 | supply_register (ZERO_REGNUM, zerobuf); | |
219 | supply_register (FP_REGNUM, zerobuf); | |
2592eef8 PS |
220 | } |
221 | ||
222 | void | |
223 | fill_gregset (gregsetp, regno) | |
224 | gregset_t *gregsetp; | |
225 | int regno; | |
226 | { | |
227 | int regi; | |
ffa1f5b9 | 228 | register long *regp = ALPHA_REGSET_BASE (gregsetp); |
2592eef8 PS |
229 | |
230 | for (regi = 0; regi < 31; regi++) | |
231 | if ((regno == -1) || (regno == regi)) | |
232 | *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)]; | |
233 | ||
234 | if ((regno == -1) || (regno == PC_REGNUM)) | |
235 | *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)]; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Now we do the same thing for floating-point registers. | |
240 | * Again, see the comments in m68k-tdep.c. | |
241 | */ | |
242 | ||
243 | void | |
244 | supply_fpregset (fpregsetp) | |
245 | fpregset_t *fpregsetp; | |
246 | { | |
247 | register int regi; | |
ffa1f5b9 | 248 | register long *regp = ALPHA_REGSET_BASE (fpregsetp); |
2592eef8 PS |
249 | |
250 | for (regi = 0; regi < 32; regi++) | |
251 | supply_register (regi + FP0_REGNUM, (char *)(regp + regi)); | |
252 | } | |
253 | ||
254 | void | |
255 | fill_fpregset (fpregsetp, regno) | |
256 | fpregset_t *fpregsetp; | |
257 | int regno; | |
258 | { | |
259 | int regi; | |
ffa1f5b9 | 260 | register long *regp = ALPHA_REGSET_BASE (fpregsetp); |
2592eef8 PS |
261 | |
262 | for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) | |
263 | { | |
264 | if ((regno == -1) || (regno == regi)) | |
265 | { | |
266 | *(regp + regi - FP0_REGNUM) = | |
267 | *(long *) ®isters[REGISTER_BYTE (regi)]; | |
268 | } | |
269 | } | |
270 | } | |
271 | #endif | |
a1df8e78 FF |
272 | |
273 | \f | |
274 | /* Register that we are able to handle alpha core file formats. */ | |
275 | ||
716e3a4f | 276 | static struct core_fns alpha_osf_core_fns = |
a1df8e78 | 277 | { |
716e3a4f JM |
278 | /* This really is bfd_target_unknown_flavour. */ |
279 | ||
280 | bfd_target_unknown_flavour, | |
281 | fetch_osf_core_registers, | |
ffa1f5b9 RH |
282 | NULL |
283 | }; | |
284 | ||
285 | static struct core_fns alpha_elf_core_fns = | |
286 | { | |
287 | bfd_target_elf_flavour, | |
288 | fetch_elf_core_registers, | |
a1df8e78 FF |
289 | NULL |
290 | }; | |
291 | ||
292 | void | |
293 | _initialize_core_alpha () | |
294 | { | |
716e3a4f | 295 | add_core_fns (&alpha_osf_core_fns); |
ffa1f5b9 | 296 | add_core_fns (&alpha_elf_core_fns); |
a1df8e78 | 297 | } |