1 /* Target-dependent code for GNU/Linux on MIPS processors.
3 Copyright 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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,
20 Boston, MA 02111-1307, USA. */
25 #include "solib-svr4.h"
27 #include "gdb_string.h"
29 /* Copied from <asm/elf.h>. */
33 typedef unsigned char elf_greg_t[4];
34 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
36 typedef unsigned char elf_fpreg_t[8];
37 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
39 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
54 #define EF_CP0_BADVADDR 41
55 #define EF_CP0_STATUS 42
56 #define EF_CP0_CAUSE 43
60 /* Figure out where the longjmp will land.
61 We expect the first arg to be a pointer to the jmp_buf structure from
62 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
63 is copied into PC. This routine returns 1 on success. */
65 #define MIPS_LINUX_JB_ELEMENT_SIZE 4
66 #define MIPS_LINUX_JB_PC 0
69 mips_linux_get_longjmp_target (CORE_ADDR *pc)
72 char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
74 jb_addr = read_register (A0_REGNUM);
76 if (target_read_memory (jb_addr
77 + MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE,
78 buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
81 *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
86 /* Unpack an elf_gregset_t into GDB's register cache. */
89 supply_gregset (elf_gregset_t *gregsetp)
92 elf_greg_t *regp = *gregsetp;
93 char *zerobuf = alloca (MAX_REGISTER_RAW_SIZE);
95 memset (zerobuf, 0, MAX_REGISTER_RAW_SIZE);
97 for (regi = EF_REG0; regi <= EF_REG31; regi++)
98 supply_register ((regi - EF_REG0), (char *)(regp + regi));
100 supply_register (LO_REGNUM, (char *)(regp + EF_LO));
101 supply_register (HI_REGNUM, (char *)(regp + EF_HI));
103 supply_register (PC_REGNUM, (char *)(regp + EF_CP0_EPC));
104 supply_register (BADVADDR_REGNUM, (char *)(regp + EF_CP0_BADVADDR));
105 supply_register (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
106 supply_register (CAUSE_REGNUM, (char *)(regp + EF_CP0_CAUSE));
108 /* Fill inaccessible registers with zero. */
109 supply_register (UNUSED_REGNUM, zerobuf);
110 for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
111 supply_register (regi, zerobuf);
114 /* Pack our registers (or one register) into an elf_gregset_t. */
117 fill_gregset (elf_gregset_t *gregsetp, int regno)
120 elf_greg_t *regp = *gregsetp;
125 memset (regp, 0, sizeof (elf_gregset_t));
126 for (regi = 0; regi < 32; regi++)
127 fill_gregset (gregsetp, regi);
128 fill_gregset (gregsetp, LO_REGNUM);
129 fill_gregset (gregsetp, HI_REGNUM);
130 fill_gregset (gregsetp, PC_REGNUM);
131 fill_gregset (gregsetp, BADVADDR_REGNUM);
132 fill_gregset (gregsetp, PS_REGNUM);
133 fill_gregset (gregsetp, CAUSE_REGNUM);
140 src = &deprecated_registers[REGISTER_BYTE (regno)];
141 dst = regp + regno + EF_REG0;
142 memcpy (dst, src, sizeof (elf_greg_t));
156 regaddr = EF_CP0_EPC;
158 case BADVADDR_REGNUM:
159 regaddr = EF_CP0_BADVADDR;
162 regaddr = EF_CP0_STATUS;
165 regaddr = EF_CP0_CAUSE;
171 src = &deprecated_registers[REGISTER_BYTE (regno)];
172 dst = regp + regaddr;
173 memcpy (dst, src, sizeof (elf_greg_t));
177 /* Likewise, unpack an elf_fpregset_t. */
180 supply_fpregset (elf_fpregset_t *fpregsetp)
183 char *zerobuf = alloca (MAX_REGISTER_RAW_SIZE);
185 memset (zerobuf, 0, MAX_REGISTER_RAW_SIZE);
187 for (regi = 0; regi < 32; regi++)
188 supply_register (FP0_REGNUM + regi,
189 (char *)(*fpregsetp + regi));
191 supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32));
193 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
194 supply_register (FCRIR_REGNUM, zerobuf);
197 /* Likewise, pack one or all floating point registers into an
201 fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
205 if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
207 from = (char *) &deprecated_registers[REGISTER_BYTE (regno)];
208 to = (char *) (*fpregsetp + regno - FP0_REGNUM);
209 memcpy (to, from, REGISTER_RAW_SIZE (regno - FP0_REGNUM));
211 else if (regno == FCRCS_REGNUM)
213 from = (char *) &deprecated_registers[REGISTER_BYTE (regno)];
214 to = (char *) (*fpregsetp + 32);
215 memcpy (to, from, REGISTER_RAW_SIZE (regno));
217 else if (regno == -1)
221 for (regi = 0; regi < 32; regi++)
222 fill_fpregset (fpregsetp, FP0_REGNUM + regi);
223 fill_fpregset(fpregsetp, FCRCS_REGNUM);
227 /* Map gdb internal register number to ptrace ``address''.
228 These ``addresses'' are normally defined in <asm/ptrace.h>. */
231 register_addr (int regno, CORE_ADDR blockend)
235 if (regno < 0 || regno >= NUM_REGS)
236 error ("Bogon register number %d.", regno);
240 else if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
241 regaddr = FPR_BASE + (regno - FP0_REGNUM);
242 else if (regno == PC_REGNUM)
244 else if (regno == CAUSE_REGNUM)
246 else if (regno == BADVADDR_REGNUM)
248 else if (regno == LO_REGNUM)
250 else if (regno == HI_REGNUM)
252 else if (regno == FCRCS_REGNUM)
254 else if (regno == FCRIR_REGNUM)
257 error ("Unknowable register number %d.", regno);
262 /* Use a local version of this function to get the correct types for
263 regsets, until multi-arch core support is ready. */
266 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
267 int which, CORE_ADDR reg_addr)
269 elf_gregset_t gregset;
270 elf_fpregset_t fpregset;
274 if (core_reg_size != sizeof (gregset))
276 warning ("wrong size gregset struct in core file");
280 memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
281 supply_gregset (&gregset);
286 if (core_reg_size != sizeof (fpregset))
288 warning ("wrong size fpregset struct in core file");
292 memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
293 supply_fpregset (&fpregset);
298 /* Register that we are able to handle ELF file formats using standard
299 procfs "regset" structures. */
301 static struct core_fns regset_core_fns =
303 bfd_target_elf_flavour, /* core_flavour */
304 default_check_format, /* check_format */
305 default_core_sniffer, /* core_sniffer */
306 fetch_core_registers, /* core_read_registers */
310 /* Fetch (and possibly build) an appropriate link_map_offsets
311 structure for native GNU/Linux MIPS targets using the struct offsets
312 defined in link.h (but without actual reference to that file).
314 This makes it possible to access GNU/Linux MIPS shared libraries from a
315 GDB that was built on a different host platform (for cross debugging). */
317 static struct link_map_offsets *
318 mips_linux_svr4_fetch_link_map_offsets (void)
320 static struct link_map_offsets lmo;
321 static struct link_map_offsets *lmp = NULL;
327 lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
328 this is all we need. */
329 lmo.r_map_offset = 4;
332 lmo.link_map_size = 20;
334 lmo.l_addr_offset = 0;
337 lmo.l_name_offset = 4;
340 lmo.l_next_offset = 12;
343 lmo.l_prev_offset = 16;
351 mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
353 set_gdbarch_get_longjmp_target (gdbarch, mips_linux_get_longjmp_target);
354 set_solib_svr4_fetch_link_map_offsets
355 (gdbarch, mips_linux_svr4_fetch_link_map_offsets);
359 _initialize_mips_linux_tdep (void)
361 gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_LINUX,
362 mips_linux_init_abi);
363 add_core_fns (®set_core_fns);