Commit | Line | Data |
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cef4c2e7 | 1 | /* Low level Alpha interface, for GDB when running native. |
7531f36e | 2 | Copyright 1993, 1995, 1996 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> | |
25 | #include <machine/reg.h> | |
7531f36e | 26 | #include <sys/user.h> |
cef4c2e7 PS |
27 | |
28 | /* Size of elements in jmpbuf */ | |
29 | ||
30 | #define JB_ELEMENT_SIZE 8 | |
31 | ||
32 | /* The definition for JB_PC in machine/reg.h is wrong. | |
33 | And we can't get at the correct definition in setjmp.h as it is | |
34 | not always available (eg. if _POSIX_SOURCE is defined which is the | |
35 | default). As the defintion is unlikely to change (see comment | |
36 | in <setjmp.h>, define the correct value here. */ | |
37 | ||
38 | #undef JB_PC | |
39 | #define JB_PC 2 | |
40 | ||
41 | /* Figure out where the longjmp will land. | |
42 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
43 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
44 | This routine returns true on success. */ | |
45 | ||
46 | int | |
47 | get_longjmp_target (pc) | |
48 | CORE_ADDR *pc; | |
49 | { | |
50 | CORE_ADDR jb_addr; | |
51 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
52 | ||
53 | jb_addr = read_register(A0_REGNUM); | |
54 | ||
55 | if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer, | |
56 | sizeof(CORE_ADDR))) | |
57 | return 0; | |
58 | ||
59 | *pc = extract_address (raw_buffer, sizeof(CORE_ADDR)); | |
60 | return 1; | |
61 | } | |
62 | ||
63 | /* Extract the register values out of the core file and store | |
64 | them where `read_register' will find them. | |
65 | ||
66 | CORE_REG_SECT points to the register values themselves, read into memory. | |
67 | CORE_REG_SIZE is the size of that area. | |
68 | WHICH says which set of registers we are handling (0 = int, 2 = float | |
69 | on machines where they are discontiguous). | |
70 | REG_ADDR is the offset from u.u_ar0 to the register values relative to | |
71 | core_reg_sect. This is used with old-fashioned core files to | |
72 | locate the registers in a large upage-plus-stack ".reg" section. | |
73 | Original upage address X is at location core_reg_sect+x+reg_addr. | |
74 | */ | |
75 | ||
a1df8e78 | 76 | static void |
cef4c2e7 PS |
77 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
78 | char *core_reg_sect; | |
79 | unsigned core_reg_size; | |
80 | int which; | |
81 | unsigned reg_addr; | |
82 | { | |
83 | register int regno; | |
84 | register int addr; | |
85 | int bad_reg = -1; | |
86 | ||
87 | /* Table to map a gdb regnum to an index in the core register section. | |
88 | The floating point register values are garbage in OSF/1.2 core files. */ | |
89 | static int core_reg_mapping[NUM_REGS] = | |
90 | { | |
91 | #define EFL (EF_SIZE / 8) | |
92 | EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6, | |
93 | EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6, | |
94 | EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9, | |
95 | EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1, | |
96 | EFL+0, EFL+1, EFL+2, EFL+3, EFL+4, EFL+5, EFL+6, EFL+7, | |
97 | EFL+8, EFL+9, EFL+10, EFL+11, EFL+12, EFL+13, EFL+14, EFL+15, | |
98 | EFL+16, EFL+17, EFL+18, EFL+19, EFL+20, EFL+21, EFL+22, EFL+23, | |
99 | EFL+24, EFL+25, EFL+26, EFL+27, EFL+28, EFL+29, EFL+30, EFL+31, | |
100 | EF_PC, -1 | |
101 | }; | |
102 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; | |
103 | ||
104 | for (regno = 0; regno < NUM_REGS; regno++) | |
105 | { | |
106 | if (CANNOT_FETCH_REGISTER (regno)) | |
107 | { | |
108 | supply_register (regno, zerobuf); | |
109 | continue; | |
110 | } | |
111 | addr = 8 * core_reg_mapping[regno]; | |
112 | if (addr < 0 || addr >= core_reg_size) | |
113 | { | |
114 | if (bad_reg < 0) | |
115 | bad_reg = regno; | |
116 | } | |
117 | else | |
118 | { | |
119 | supply_register (regno, core_reg_sect + addr); | |
120 | } | |
121 | } | |
122 | if (bad_reg >= 0) | |
123 | { | |
124 | error ("Register %s not found in core file.", reg_names[bad_reg]); | |
125 | } | |
126 | } | |
127 | ||
128 | /* Map gdb internal register number to a ptrace ``address''. | |
129 | These ``addresses'' are defined in <sys/ptrace.h> */ | |
130 | ||
131 | #define REGISTER_PTRACE_ADDR(regno) \ | |
132 | (regno < FP0_REGNUM ? GPR_BASE + (regno) \ | |
133 | : regno == PC_REGNUM ? PC \ | |
134 | : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \ | |
135 | : 0) | |
136 | ||
137 | /* Return the ptrace ``address'' of register REGNO. */ | |
138 | ||
139 | unsigned int | |
140 | register_addr (regno, blockend) | |
141 | int regno; | |
142 | int blockend; | |
143 | { | |
144 | return REGISTER_PTRACE_ADDR (regno); | |
145 | } | |
2592eef8 | 146 | |
7531f36e FF |
147 | int |
148 | kernel_u_size () | |
149 | { | |
150 | return (sizeof (struct user)); | |
151 | } | |
152 | ||
2592eef8 PS |
153 | #ifdef USE_PROC_FS |
154 | #include <sys/procfs.h> | |
155 | ||
156 | /* | |
157 | * See the comment in m68k-tdep.c regarding the utility of these functions. | |
158 | */ | |
159 | ||
160 | void | |
161 | supply_gregset (gregsetp) | |
162 | gregset_t *gregsetp; | |
163 | { | |
164 | register int regi; | |
165 | register long *regp = gregsetp->regs; | |
3f403f6a | 166 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; |
2592eef8 PS |
167 | |
168 | for (regi = 0; regi < 31; regi++) | |
169 | supply_register (regi, (char *)(regp + regi)); | |
170 | ||
171 | supply_register (PC_REGNUM, (char *)(regp + 31)); | |
3f403f6a PS |
172 | |
173 | /* Fill inaccessible registers with zero. */ | |
174 | supply_register (ZERO_REGNUM, zerobuf); | |
175 | supply_register (FP_REGNUM, zerobuf); | |
2592eef8 PS |
176 | } |
177 | ||
178 | void | |
179 | fill_gregset (gregsetp, regno) | |
180 | gregset_t *gregsetp; | |
181 | int regno; | |
182 | { | |
183 | int regi; | |
184 | register long *regp = gregsetp->regs; | |
185 | ||
186 | for (regi = 0; regi < 31; regi++) | |
187 | if ((regno == -1) || (regno == regi)) | |
188 | *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)]; | |
189 | ||
190 | if ((regno == -1) || (regno == PC_REGNUM)) | |
191 | *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)]; | |
192 | } | |
193 | ||
194 | /* | |
195 | * Now we do the same thing for floating-point registers. | |
196 | * Again, see the comments in m68k-tdep.c. | |
197 | */ | |
198 | ||
199 | void | |
200 | supply_fpregset (fpregsetp) | |
201 | fpregset_t *fpregsetp; | |
202 | { | |
203 | register int regi; | |
204 | register long *regp = fpregsetp->regs; | |
205 | ||
206 | for (regi = 0; regi < 32; regi++) | |
207 | supply_register (regi + FP0_REGNUM, (char *)(regp + regi)); | |
208 | } | |
209 | ||
210 | void | |
211 | fill_fpregset (fpregsetp, regno) | |
212 | fpregset_t *fpregsetp; | |
213 | int regno; | |
214 | { | |
215 | int regi; | |
216 | register long *regp = fpregsetp->regs; | |
217 | ||
218 | for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) | |
219 | { | |
220 | if ((regno == -1) || (regno == regi)) | |
221 | { | |
222 | *(regp + regi - FP0_REGNUM) = | |
223 | *(long *) ®isters[REGISTER_BYTE (regi)]; | |
224 | } | |
225 | } | |
226 | } | |
227 | #endif | |
a1df8e78 FF |
228 | |
229 | \f | |
230 | /* Register that we are able to handle alpha core file formats. */ | |
231 | ||
232 | static struct core_fns alpha_core_fns = | |
233 | { | |
234 | bfd_target_aout_flavour, | |
235 | fetch_core_registers, | |
236 | NULL | |
237 | }; | |
238 | ||
239 | void | |
240 | _initialize_core_alpha () | |
241 | { | |
242 | add_core_fns (&alpha_core_fns); | |
243 | } |