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1 | /* S390 native-dependent code for GDB, the GNU debugger. |
2 | Copyright 2001 Free Software Foundation, Inc | |
3 | Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) | |
4 | for IBM Deutschland Entwicklung GmbH, IBM Corporation. | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "tm.h" | |
24 | #include <asm/ptrace.h> | |
25 | #include <sys/ptrace.h> | |
26 | #include <asm/processor.h> | |
27 | #include <sys/procfs.h> | |
28 | #include <sys/user.h> | |
29 | #include <value.h> | |
30 | #include <sys/ucontext.h> | |
31 | #ifndef offsetof | |
32 | #define offsetof(type,member) ((size_t) &((type *)0)->member) | |
33 | #endif | |
34 | ||
35 | ||
36 | int | |
37 | s390_register_u_addr (int blockend, int regnum) | |
38 | { | |
39 | int retval; | |
40 | ||
41 | if (regnum >= S390_GP0_REGNUM && regnum <= S390_GP_LAST_REGNUM) | |
42 | retval = PT_GPR0 + ((regnum - S390_GP0_REGNUM) * S390_GPR_SIZE); | |
43 | else if (regnum >= S390_PSWM_REGNUM && regnum <= S390_PC_REGNUM) | |
44 | retval = PT_PSWMASK + ((regnum - S390_PSWM_REGNUM) * S390_PSW_MASK_SIZE); | |
45 | else if (regnum == S390_FPC_REGNUM) | |
46 | retval = PT_FPC; | |
47 | else if (regnum >= S390_FP0_REGNUM && regnum <= S390_FPLAST_REGNUM) | |
48 | retval = | |
49 | #if CONFIG_ARCH_S390X | |
50 | PT_FPR0 | |
51 | #else | |
52 | PT_FPR0_HI | |
53 | #endif | |
54 | + ((regnum - S390_FP0_REGNUM) * S390_FPR_SIZE); | |
55 | else if (regnum >= S390_FIRST_ACR && regnum <= S390_LAST_ACR) | |
56 | retval = PT_ACR0 + ((regnum - S390_FIRST_ACR) * S390_ACR_SIZE); | |
57 | else if (regnum >= (S390_FIRST_CR + 9) && regnum <= (S390_FIRST_CR + 11)) | |
58 | retval = PT_CR_9 + ((regnum - (S390_FIRST_CR + 9)) * S390_CR_SIZE); | |
59 | else | |
60 | { | |
61 | #ifdef GDBSERVER | |
62 | error | |
63 | #else | |
64 | internal_error | |
65 | #endif | |
66 | ("s390_register_u_addr invalid regnum %s %d regnum=%d", __FILE__, | |
67 | (int) __LINE__, regnum); | |
68 | retval = 0; | |
69 | } | |
70 | return retval + blockend; | |
71 | } | |
72 | ||
73 | #ifndef GDBSERVER | |
74 | /* watch_areas are required if you put 2 or more watchpoints on the same | |
75 | address or overlapping areas gdb will call us to delete the watchpoint | |
76 | more than once when we try to delete them. | |
77 | attempted reference counting to reduce the number of areas unfortunately | |
78 | they didn't shrink when areas had to be split overlapping occurs. */ | |
79 | struct watch_area; | |
80 | typedef struct watch_area watch_area; | |
81 | struct watch_area | |
82 | { | |
83 | watch_area *next; | |
84 | CORE_ADDR lo_addr; | |
85 | CORE_ADDR hi_addr; | |
86 | }; | |
87 | ||
88 | static watch_area *watch_base = NULL; | |
89 | int watch_area_cnt = 0; | |
90 | static CORE_ADDR watch_lo_addr = 0, watch_hi_addr = 0; | |
91 | ||
92 | ||
93 | ||
94 | CORE_ADDR | |
95 | s390_stopped_by_watchpoint (int pid) | |
96 | { | |
97 | per_lowcore_bits per_lowcore; | |
98 | ptrace_area parea; | |
99 | ||
100 | parea.len = sizeof (per_lowcore); | |
101 | parea.process_addr = (addr_t) & per_lowcore; | |
102 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); | |
103 | ptrace (PTRACE_PEEKUSR_AREA, pid, &parea); | |
104 | return ((per_lowcore.perc_storage_alteration == 1) && | |
105 | (per_lowcore.perc_store_real_address == 0)); | |
106 | } | |
107 | ||
108 | ||
109 | void | |
110 | s390_fix_watch_points (int pid) | |
111 | { | |
112 | per_struct per_info; | |
113 | ptrace_area parea; | |
114 | ||
115 | parea.len = sizeof (per_info); | |
116 | parea.process_addr = (addr_t) & per_info; | |
117 | parea.kernel_addr = PT_CR_9; | |
118 | ptrace (PTRACE_PEEKUSR_AREA, pid, &parea); | |
119 | /* The kernel automatically sets the psw for per depending */ | |
120 | /* on whether the per control registers are set for event recording */ | |
121 | /* & sets cr9 & cr10 appropriately also */ | |
122 | if (watch_area_cnt) | |
123 | { | |
124 | per_info.control_regs.bits.em_storage_alteration = 1; | |
125 | per_info.control_regs.bits.storage_alt_space_ctl = 1; | |
126 | } | |
127 | else | |
128 | { | |
129 | per_info.control_regs.bits.em_storage_alteration = 0; | |
130 | per_info.control_regs.bits.storage_alt_space_ctl = 0; | |
131 | } | |
132 | per_info.starting_addr = watch_lo_addr; | |
133 | per_info.ending_addr = watch_hi_addr; | |
134 | ptrace (PTRACE_POKEUSR_AREA, pid, &parea); | |
135 | } | |
136 | ||
137 | int | |
138 | s390_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw) | |
139 | { | |
140 | CORE_ADDR hi_addr = addr + len - 1; | |
141 | watch_area *newarea = (watch_area *) malloc (sizeof (watch_area)); | |
142 | ||
143 | ||
144 | if (newarea) | |
145 | { | |
146 | newarea->next = watch_base; | |
147 | watch_base = newarea; | |
148 | watch_lo_addr = min (watch_lo_addr, addr); | |
149 | watch_hi_addr = max (watch_hi_addr, hi_addr); | |
150 | newarea->lo_addr = addr; | |
151 | newarea->hi_addr = hi_addr; | |
152 | if (watch_area_cnt == 0) | |
153 | { | |
154 | watch_lo_addr = newarea->lo_addr; | |
155 | watch_hi_addr = newarea->hi_addr; | |
156 | } | |
157 | watch_area_cnt++; | |
158 | s390_fix_watch_points (pid); | |
159 | } | |
160 | return newarea ? 0 : -1; | |
161 | } | |
162 | ||
163 | ||
164 | int | |
165 | s390_remove_watchpoint (int pid, CORE_ADDR addr, int len) | |
166 | { | |
167 | watch_area *curr = watch_base, *prev, *matchCurr; | |
168 | CORE_ADDR hi_addr = addr + len - 1; | |
169 | CORE_ADDR watch_second_lo_addr = 0xffffffffUL, watch_second_hi_addr = 0; | |
170 | int lo_addr_ref_cnt, hi_addr_ref_cnt; | |
171 | prev = matchCurr = NULL; | |
172 | lo_addr_ref_cnt = (addr == watch_lo_addr); | |
173 | hi_addr_ref_cnt = (addr == watch_hi_addr); | |
174 | while (curr) | |
175 | { | |
176 | if (matchCurr == NULL) | |
177 | { | |
178 | if (curr->lo_addr == addr && curr->hi_addr == hi_addr) | |
179 | { | |
180 | matchCurr = curr; | |
181 | if (prev) | |
182 | prev->next = curr->next; | |
183 | else | |
184 | watch_base = curr->next; | |
185 | } | |
186 | prev = curr; | |
187 | } | |
188 | if (lo_addr_ref_cnt) | |
189 | { | |
190 | if (watch_lo_addr == curr->lo_addr) | |
191 | lo_addr_ref_cnt++; | |
192 | if (curr->lo_addr > watch_lo_addr && | |
193 | curr->lo_addr < watch_second_lo_addr) | |
194 | watch_second_lo_addr = curr->lo_addr; | |
195 | } | |
196 | if (hi_addr_ref_cnt) | |
197 | { | |
198 | if (watch_hi_addr == curr->hi_addr) | |
199 | hi_addr_ref_cnt++; | |
200 | if (curr->hi_addr < watch_hi_addr && | |
201 | curr->hi_addr > watch_second_hi_addr) | |
202 | watch_second_hi_addr = curr->hi_addr; | |
203 | } | |
204 | curr = curr->next; | |
205 | } | |
206 | if (matchCurr) | |
207 | { | |
208 | free (matchCurr); | |
209 | watch_area_cnt--; | |
210 | if (watch_area_cnt) | |
211 | { | |
212 | if (lo_addr_ref_cnt == 2) | |
213 | watch_lo_addr = watch_second_lo_addr; | |
214 | if (hi_addr_ref_cnt == 2) | |
215 | watch_hi_addr = watch_second_hi_addr; | |
216 | } | |
217 | else | |
218 | { | |
219 | watch_lo_addr = watch_hi_addr = 0; | |
220 | } | |
221 | s390_fix_watch_points (pid); | |
222 | return 0; | |
223 | } | |
224 | else | |
225 | { | |
226 | fprintf_unfiltered (gdb_stderr, | |
227 | "Attempt to remove nonexistent watchpoint in s390_remove_watchpoint\n"); | |
228 | return -1; | |
229 | } | |
230 | } | |
231 | ||
232 | int | |
233 | kernel_u_size (void) | |
234 | { | |
235 | return sizeof (struct user); | |
236 | } | |
237 | ||
238 | ||
239 | #if (defined (S390_FP0_REGNUM) && defined (HAVE_FPREGSET_T) && defined(HAVE_SYS_PROCFS_H) && defined (HAVE_GREGSET_T)) | |
240 | void | |
241 | supply_gregset (gregset_t * gregsetp) | |
242 | { | |
243 | int regi; | |
244 | greg_t *gregp = (greg_t *) gregsetp; | |
245 | ||
246 | supply_register (S390_PSWM_REGNUM, (char *) &gregp[S390_PSWM_REGNUM]); | |
247 | supply_register (S390_PC_REGNUM, (char *) &gregp[S390_PC_REGNUM]); | |
248 | for (regi = 0; regi < S390_NUM_GPRS; regi++) | |
249 | supply_register (S390_GP0_REGNUM + regi, | |
250 | (char *) &gregp[S390_GP0_REGNUM + regi]); | |
251 | for (regi = 0; regi < S390_NUM_ACRS; regi++) | |
252 | supply_register (S390_FIRST_ACR + regi, | |
253 | (char *) &gregp[S390_FIRST_ACR + regi]); | |
254 | /* unfortunately this isn't in gregsetp */ | |
255 | for (regi = 0; regi < S390_NUM_CRS; regi++) | |
256 | supply_register (S390_FIRST_CR + regi, NULL); | |
257 | } | |
258 | ||
259 | ||
260 | void | |
261 | supply_fpregset (fpregset_t * fpregsetp) | |
262 | { | |
263 | int regi; | |
264 | ||
265 | supply_register (S390_FPC_REGNUM, (char *) &fpregsetp->fpc); | |
266 | for (regi = 0; regi < S390_NUM_FPRS; regi++) | |
267 | supply_register (S390_FP0_REGNUM + regi, (char *) &fpregsetp->fprs[regi]); | |
268 | ||
269 | } | |
270 | ||
271 | void | |
272 | fill_gregset (gregset_t * gregsetp, int regno) | |
273 | { | |
274 | greg_t *gregp = (greg_t *) gregsetp; | |
275 | ||
276 | if (regno >= S390_FIRST_CR && regno <= S390_LAST_CR) | |
277 | supply_register (regno, NULL); | |
278 | else if (regno != -1) | |
279 | supply_register (regno, (char *) &gregp[regno]); | |
280 | else | |
281 | supply_gregset (gregsetp); | |
282 | } | |
283 | ||
284 | /* Given a pointer to a floating point register set in /proc format | |
285 | (fpregset_t *), update the register specified by REGNO from gdb's idea | |
286 | of the current floating point register set. If REGNO is -1, update | |
287 | them all. */ | |
288 | ||
289 | void | |
290 | fill_fpregset (fpregset_t * fpregsetp, int regno) | |
291 | { | |
292 | if (regno == -1) | |
293 | supply_fpregset (fpregsetp); | |
294 | else | |
295 | supply_register (regno, | |
296 | &((char *) fpregsetp)[REGISTER_BYTE (regno) - | |
297 | REGISTER_BYTE (S390_FPC_REGNUM)]); | |
298 | } | |
299 | ||
300 | ||
301 | #else | |
302 | #error "There are a few possibilities here" | |
303 | #error "1) You aren't compiling for linux & don't need a core dumps to work." | |
304 | #error "2) The header files sys/elf.h sys/user.h sys/ptrace.h & sys/procfs.h" | |
305 | #error "libc files are inconsistent with linux/include/asm-s390/" | |
306 | #error "3) you didn't do a completely clean build & delete config.cache." | |
307 | #endif | |
308 | #endif /* GDBSERVER */ |