1 /* Native support for the SGI Iris running IRIX version 4, for GDB.
2 Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1995
3 Free Software Foundation, Inc.
4 Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
5 and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
6 Implemented for Irix 4.x by Garrett A. Wollman.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
30 #include <sys/procfs.h>
31 #include <setjmp.h> /* For JB_XXX. */
33 /* Prototypes for supply_gregset etc. */
36 /* Size of elements in jmpbuf */
38 #define JB_ELEMENT_SIZE 4
40 typedef unsigned int greg_t; /* why isn't this defined? */
42 static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);
45 * See the comment in m68k-tdep.c regarding the utility of these functions.
49 supply_gregset (gregset_t *gregsetp)
52 register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
53 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
56 /* FIXME: somewhere, there should be a #define for the meaning
57 of this magic number 32; we should use that. */
58 for (regi = 0; regi < 32; regi++)
59 supply_register (regi, (char *) (regp + regi));
61 supply_register (PC_REGNUM, (char *) &(gregsetp->gp_pc));
62 supply_register (HI_REGNUM, (char *) &(gregsetp->gp_mdhi));
63 supply_register (LO_REGNUM, (char *) &(gregsetp->gp_mdlo));
64 supply_register (CAUSE_REGNUM, (char *) &(gregsetp->gp_cause));
66 /* Fill inaccessible registers with zero. */
67 supply_register (BADVADDR_REGNUM, zerobuf);
71 fill_gregset (gregset_t *gregsetp, int regno)
74 register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
76 /* same FIXME as above wrt 32 */
77 for (regi = 0; regi < 32; regi++)
78 if ((regno == -1) || (regno == regi))
79 *(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)];
81 if ((regno == -1) || (regno == PC_REGNUM))
82 gregsetp->gp_pc = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];
84 if ((regno == -1) || (regno == CAUSE_REGNUM))
85 gregsetp->gp_cause = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];
87 if ((regno == -1) || (regno == HI_REGNUM))
88 gregsetp->gp_mdhi = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];
90 if ((regno == -1) || (regno == LO_REGNUM))
91 gregsetp->gp_mdlo = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)];
95 * Now we do the same thing for floating-point registers.
96 * We don't bother to condition on FP0_REGNUM since any
97 * reasonable MIPS configuration has an R3010 in it.
99 * Again, see the comments in m68k-tdep.c.
103 supply_fpregset (fpregset_t *fpregsetp)
106 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
109 for (regi = 0; regi < 32; regi++)
110 supply_register (FP0_REGNUM + regi,
111 (char *) &fpregsetp->fp_r.fp_regs[regi]);
113 supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);
115 /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
116 supply_register (FCRIR_REGNUM, zerobuf);
120 fill_fpregset (fpregset_t *fpregsetp, int regno)
125 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
127 if ((regno == -1) || (regno == regi))
129 from = (char *) ®isters[REGISTER_BYTE (regi)];
130 to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
131 memcpy (to, from, REGISTER_RAW_SIZE (regi));
135 if ((regno == -1) || (regno == FCRCS_REGNUM))
136 fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE (FCRCS_REGNUM)];
140 /* Figure out where the longjmp will land.
141 We expect the first arg to be a pointer to the jmp_buf structure from which
142 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
143 This routine returns true on success. */
146 get_longjmp_target (CORE_ADDR *pc)
151 buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
152 jb_addr = read_register (A0_REGNUM);
154 if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
155 TARGET_PTR_BIT / TARGET_CHAR_BIT))
158 *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
163 /* Provide registers to GDB from a core file.
165 CORE_REG_SECT points to an array of bytes, which were obtained from
166 a core file which BFD thinks might contain register contents.
167 CORE_REG_SIZE is its size.
169 Normally, WHICH says which register set corelow suspects this is:
170 0 --- the general-purpose register set
171 2 --- the floating-point register set
172 However, for Irix 4, WHICH isn't used.
174 REG_ADDR is also unused. */
177 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
178 int which, CORE_ADDR reg_addr)
180 if (core_reg_size != REGISTER_BYTES)
182 warning ("wrong size gregset struct in core file");
186 memcpy ((char *) registers, core_reg_sect, core_reg_size);
190 /* Register that we are able to handle irix4 core file formats.
191 FIXME: is this really bfd_target_unknown_flavour? */
193 static struct core_fns irix4_core_fns =
195 bfd_target_unknown_flavour, /* core_flavour */
196 default_check_format, /* check_format */
197 default_core_sniffer, /* core_sniffer */
198 fetch_core_registers, /* core_read_registers */
203 _initialize_core_irix4 (void)
205 add_core_fns (&irix4_core_fns);