1 /* GNU/Linux/PowerPC specific low level interface, for the remote server for
3 Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2007, 2008
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "linux-low.h"
25 #include <asm/ptrace.h>
27 /* These are in <asm/cputable.h> in current kernels. */
28 #define PPC_FEATURE_HAS_ALTIVEC 0x10000000
29 #define PPC_FEATURE_HAS_SPE 0x00800000
31 static unsigned long ppc_hwcap;
34 /* Defined in auto-generated file powerpc-32l.c. */
35 void init_registers_powerpc_32l (void);
36 /* Defined in auto-generated file powerpc-altivec32l.c. */
37 void init_registers_powerpc_altivec32l (void);
38 /* Defined in auto-generated file powerpc-e500l.c. */
39 void init_registers_powerpc_e500l (void);
40 /* Defined in auto-generated file powerpc-64l.c. */
41 void init_registers_powerpc_64l (void);
42 /* Defined in auto-generated file powerpc-altivec64l.c. */
43 void init_registers_powerpc_altivec64l (void);
45 #define ppc_num_regs 73
47 /* This sometimes isn't defined. */
56 /* We use a constant for FPSCR instead of PT_FPSCR, because
57 many shipped PPC64 kernels had the wrong value in ptrace.h. */
58 static int ppc_regmap[] =
59 {PT_R0 * 8, PT_R1 * 8, PT_R2 * 8, PT_R3 * 8,
60 PT_R4 * 8, PT_R5 * 8, PT_R6 * 8, PT_R7 * 8,
61 PT_R8 * 8, PT_R9 * 8, PT_R10 * 8, PT_R11 * 8,
62 PT_R12 * 8, PT_R13 * 8, PT_R14 * 8, PT_R15 * 8,
63 PT_R16 * 8, PT_R17 * 8, PT_R18 * 8, PT_R19 * 8,
64 PT_R20 * 8, PT_R21 * 8, PT_R22 * 8, PT_R23 * 8,
65 PT_R24 * 8, PT_R25 * 8, PT_R26 * 8, PT_R27 * 8,
66 PT_R28 * 8, PT_R29 * 8, PT_R30 * 8, PT_R31 * 8,
67 PT_FPR0*8, PT_FPR0*8 + 8, PT_FPR0*8+16, PT_FPR0*8+24,
68 PT_FPR0*8+32, PT_FPR0*8+40, PT_FPR0*8+48, PT_FPR0*8+56,
69 PT_FPR0*8+64, PT_FPR0*8+72, PT_FPR0*8+80, PT_FPR0*8+88,
70 PT_FPR0*8+96, PT_FPR0*8+104, PT_FPR0*8+112, PT_FPR0*8+120,
71 PT_FPR0*8+128, PT_FPR0*8+136, PT_FPR0*8+144, PT_FPR0*8+152,
72 PT_FPR0*8+160, PT_FPR0*8+168, PT_FPR0*8+176, PT_FPR0*8+184,
73 PT_FPR0*8+192, PT_FPR0*8+200, PT_FPR0*8+208, PT_FPR0*8+216,
74 PT_FPR0*8+224, PT_FPR0*8+232, PT_FPR0*8+240, PT_FPR0*8+248,
75 PT_NIP * 8, PT_MSR * 8, PT_CCR * 8, PT_LNK * 8,
76 PT_CTR * 8, PT_XER * 8, PT_FPR0*8 + 256,
77 PT_ORIG_R3 * 8, PT_TRAP * 8 };
79 /* Currently, don't check/send MQ. */
80 static int ppc_regmap[] =
81 {PT_R0 * 4, PT_R1 * 4, PT_R2 * 4, PT_R3 * 4,
82 PT_R4 * 4, PT_R5 * 4, PT_R6 * 4, PT_R7 * 4,
83 PT_R8 * 4, PT_R9 * 4, PT_R10 * 4, PT_R11 * 4,
84 PT_R12 * 4, PT_R13 * 4, PT_R14 * 4, PT_R15 * 4,
85 PT_R16 * 4, PT_R17 * 4, PT_R18 * 4, PT_R19 * 4,
86 PT_R20 * 4, PT_R21 * 4, PT_R22 * 4, PT_R23 * 4,
87 PT_R24 * 4, PT_R25 * 4, PT_R26 * 4, PT_R27 * 4,
88 PT_R28 * 4, PT_R29 * 4, PT_R30 * 4, PT_R31 * 4,
89 PT_FPR0*4, PT_FPR0*4 + 8, PT_FPR0*4+16, PT_FPR0*4+24,
90 PT_FPR0*4+32, PT_FPR0*4+40, PT_FPR0*4+48, PT_FPR0*4+56,
91 PT_FPR0*4+64, PT_FPR0*4+72, PT_FPR0*4+80, PT_FPR0*4+88,
92 PT_FPR0*4+96, PT_FPR0*4+104, PT_FPR0*4+112, PT_FPR0*4+120,
93 PT_FPR0*4+128, PT_FPR0*4+136, PT_FPR0*4+144, PT_FPR0*4+152,
94 PT_FPR0*4+160, PT_FPR0*4+168, PT_FPR0*4+176, PT_FPR0*4+184,
95 PT_FPR0*4+192, PT_FPR0*4+200, PT_FPR0*4+208, PT_FPR0*4+216,
96 PT_FPR0*4+224, PT_FPR0*4+232, PT_FPR0*4+240, PT_FPR0*4+248,
97 PT_NIP * 4, PT_MSR * 4, PT_CCR * 4, PT_LNK * 4,
98 PT_CTR * 4, PT_XER * 4, PT_FPSCR * 4,
99 PT_ORIG_R3 * 4, PT_TRAP * 4
102 static int ppc_regmap_e500[] =
103 {PT_R0 * 4, PT_R1 * 4, PT_R2 * 4, PT_R3 * 4,
104 PT_R4 * 4, PT_R5 * 4, PT_R6 * 4, PT_R7 * 4,
105 PT_R8 * 4, PT_R9 * 4, PT_R10 * 4, PT_R11 * 4,
106 PT_R12 * 4, PT_R13 * 4, PT_R14 * 4, PT_R15 * 4,
107 PT_R16 * 4, PT_R17 * 4, PT_R18 * 4, PT_R19 * 4,
108 PT_R20 * 4, PT_R21 * 4, PT_R22 * 4, PT_R23 * 4,
109 PT_R24 * 4, PT_R25 * 4, PT_R26 * 4, PT_R27 * 4,
110 PT_R28 * 4, PT_R29 * 4, PT_R30 * 4, PT_R31 * 4,
119 PT_NIP * 4, PT_MSR * 4, PT_CCR * 4, PT_LNK * 4,
120 PT_CTR * 4, PT_XER * 4, -1,
121 PT_ORIG_R3 * 4, PT_TRAP * 4
126 ppc_cannot_store_register (int regno)
128 #ifndef __powerpc64__
129 /* Some kernels do not allow us to store fpscr. */
130 if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE) && regno == find_regno ("fpscr"))
134 /* Some kernels do not allow us to store orig_r3 or trap. */
135 if (regno == find_regno ("orig_r3")
136 || regno == find_regno ("trap"))
143 ppc_cannot_fetch_register (int regno)
149 ppc_collect_ptrace_register (int regno, char *buf)
151 int size = register_size (regno);
152 if (size < sizeof (long))
153 collect_register (regno, buf + sizeof (long) - size);
155 collect_register (regno, buf);
159 ppc_supply_ptrace_register (int regno, const char *buf)
161 int size = register_size (regno);
162 if (size < sizeof (long))
163 supply_register (regno, buf + sizeof (long) - size);
165 supply_register (regno, buf);
171 if (register_size (0) == 4)
174 collect_register_by_name ("pc", &pc);
175 return (CORE_ADDR) pc;
180 collect_register_by_name ("pc", &pc);
181 return (CORE_ADDR) pc;
186 ppc_set_pc (CORE_ADDR pc)
188 if (register_size (0) == 4)
190 unsigned int newpc = pc;
191 supply_register_by_name ("pc", &newpc);
195 unsigned long newpc = pc;
196 supply_register_by_name ("pc", &newpc);
202 ppc_get_hwcap (unsigned long *valp)
204 int wordsize = register_size (0);
205 unsigned char *data = alloca (2 * wordsize);
208 while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
212 unsigned int *data_p = (unsigned int *)data;
213 if (data_p[0] == AT_HWCAP)
221 unsigned long *data_p = (unsigned long *)data;
222 if (data_p[0] == AT_HWCAP)
229 offset += 2 * wordsize;
237 ppc_arch_setup (void)
242 /* On a 64-bit host, assume 64-bit inferior process with no
243 AltiVec registers. Reset ppc_hwcap to ensure that the
244 collect_register call below does not fail. */
245 init_registers_powerpc_64l ();
248 /* Only if the high bit of the MSR is set, we actually have
249 a 64-bit inferior. */
250 collect_register_by_name ("msr", &msr);
253 ppc_get_hwcap (&ppc_hwcap);
254 if (ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC)
255 init_registers_powerpc_altivec64l ();
261 /* OK, we have a 32-bit inferior. */
262 init_registers_powerpc_32l ();
264 ppc_get_hwcap (&ppc_hwcap);
265 if (ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC)
266 init_registers_powerpc_altivec32l ();
268 /* On 32-bit machines, check for SPE registers.
269 Set the low target's regmap field as appropriately. */
270 #ifndef __powerpc64__
271 the_low_target.regmap = ppc_regmap;
272 if (ppc_hwcap & PPC_FEATURE_HAS_SPE)
274 init_registers_powerpc_e500l ();
275 the_low_target.regmap = ppc_regmap_e500;
280 /* Correct in either endianness.
281 This instruction is "twge r2, r2", which GDB uses as a software
283 static const unsigned int ppc_breakpoint = 0x7d821008;
284 #define ppc_breakpoint_len 4
287 ppc_breakpoint_at (CORE_ADDR where)
291 (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
292 if (insn == ppc_breakpoint)
294 /* If necessary, recognize more trap instructions here. GDB only uses the
299 /* Provide only a fill function for the general register set. ps_lgetregs
300 will use this for NPTL support. */
302 static void ppc_fill_gregset (void *buf)
306 for (i = 0; i < 32; i++)
307 ppc_collect_ptrace_register (i, (char *) buf + ppc_regmap[i]);
309 for (i = 64; i < 70; i++)
310 ppc_collect_ptrace_register (i, (char *) buf + ppc_regmap[i]);
312 for (i = 71; i < 73; i++)
313 ppc_collect_ptrace_register (i, (char *) buf + ppc_regmap[i]);
316 #ifndef PTRACE_GETVRREGS
317 #define PTRACE_GETVRREGS 18
318 #define PTRACE_SETVRREGS 19
321 #define SIZEOF_VRREGS 33*16+4
324 ppc_fill_vrregset (void *buf)
329 if (!(ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC))
332 base = find_regno ("vr0");
333 for (i = 0; i < 32; i++)
334 collect_register (base + i, ®set[i * 16]);
336 collect_register_by_name ("vscr", ®set[32 * 16 + 12]);
337 collect_register_by_name ("vrsave", ®set[33 * 16]);
341 ppc_store_vrregset (const void *buf)
344 const char *regset = buf;
346 if (!(ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC))
349 base = find_regno ("vr0");
350 for (i = 0; i < 32; i++)
351 supply_register (base + i, ®set[i * 16]);
353 supply_register_by_name ("vscr", ®set[32 * 16 + 12]);
354 supply_register_by_name ("vrsave", ®set[33 * 16]);
357 #ifndef PTRACE_GETEVRREGS
358 #define PTRACE_GETEVRREGS 20
359 #define PTRACE_SETEVRREGS 21
362 struct gdb_evrregset_t
364 unsigned long evr[32];
365 unsigned long long acc;
366 unsigned long spefscr;
370 ppc_fill_evrregset (void *buf)
373 struct gdb_evrregset_t *regset = buf;
375 if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE))
378 ev0 = find_regno ("ev0h");
379 for (i = 0; i < 32; i++)
380 collect_register (ev0 + i, ®set->evr[i]);
382 collect_register_by_name ("acc", ®set->acc);
383 collect_register_by_name ("spefscr", ®set->spefscr);
387 ppc_store_evrregset (const void *buf)
390 const struct gdb_evrregset_t *regset = buf;
392 if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE))
395 ev0 = find_regno ("ev0h");
396 for (i = 0; i < 32; i++)
397 supply_register (ev0 + i, ®set->evr[i]);
399 supply_register_by_name ("acc", ®set->acc);
400 supply_register_by_name ("spefscr", ®set->spefscr);
403 struct regset_info target_regsets[] = {
404 /* List the extra register sets before GENERAL_REGS. That way we will
405 fetch them every time, but still fall back to PTRACE_PEEKUSER for the
406 general registers. Some kernels support these, but not the newer
407 PPC_PTRACE_GETREGS. */
408 { PTRACE_GETVRREGS, PTRACE_SETVRREGS, SIZEOF_VRREGS, EXTENDED_REGS,
409 ppc_fill_vrregset, ppc_store_vrregset },
410 { PTRACE_GETEVRREGS, PTRACE_SETEVRREGS, 32 * 4 + 8 + 4, EXTENDED_REGS,
411 ppc_fill_evrregset, ppc_store_evrregset },
412 { 0, 0, 0, GENERAL_REGS, ppc_fill_gregset, NULL },
413 { 0, 0, -1, -1, NULL, NULL }
416 struct linux_target_ops the_low_target = {
420 ppc_cannot_fetch_register,
421 ppc_cannot_store_register,
424 (const unsigned char *) &ppc_breakpoint,
433 ppc_collect_ptrace_register,
434 ppc_supply_ptrace_register,