1 /* Low level Alpha interface, for GDB when running native.
2 Copyright 1993, 1995, 1996 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24 #include <sys/ptrace.h>
25 #include <machine/reg.h>
28 /* Size of elements in jmpbuf */
30 #define JB_ELEMENT_SIZE 8
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. */
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. */
47 get_longjmp_target (pc)
51 char raw_buffer[MAX_REGISTER_RAW_SIZE];
53 jb_addr = read_register(A0_REGNUM);
55 if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer,
59 *pc = extract_address (raw_buffer, sizeof(CORE_ADDR));
63 /* Extract the register values out of the core file and store
64 them where `read_register' will find them.
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.
77 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
79 unsigned core_reg_size;
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] =
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,
102 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
104 for (regno = 0; regno < NUM_REGS; regno++)
106 if (CANNOT_FETCH_REGISTER (regno))
108 supply_register (regno, zerobuf);
111 addr = 8 * core_reg_mapping[regno];
112 if (addr < 0 || addr >= core_reg_size)
119 supply_register (regno, core_reg_sect + addr);
124 error ("Register %s not found in core file.", reg_names[bad_reg]);
128 /* Map gdb internal register number to a ptrace ``address''.
129 These ``addresses'' are defined in <sys/ptrace.h> */
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) \
137 /* Return the ptrace ``address'' of register REGNO. */
140 register_addr (regno, blockend)
144 return REGISTER_PTRACE_ADDR (regno);
150 return (sizeof (struct user));
154 #include <sys/procfs.h>
157 * See the comment in m68k-tdep.c regarding the utility of these functions.
161 supply_gregset (gregsetp)
165 register long *regp = gregsetp->regs;
166 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
168 for (regi = 0; regi < 31; regi++)
169 supply_register (regi, (char *)(regp + regi));
171 supply_register (PC_REGNUM, (char *)(regp + 31));
173 /* Fill inaccessible registers with zero. */
174 supply_register (ZERO_REGNUM, zerobuf);
175 supply_register (FP_REGNUM, zerobuf);
179 fill_gregset (gregsetp, regno)
184 register long *regp = gregsetp->regs;
186 for (regi = 0; regi < 31; regi++)
187 if ((regno == -1) || (regno == regi))
188 *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)];
190 if ((regno == -1) || (regno == PC_REGNUM))
191 *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)];
195 * Now we do the same thing for floating-point registers.
196 * Again, see the comments in m68k-tdep.c.
200 supply_fpregset (fpregsetp)
201 fpregset_t *fpregsetp;
204 register long *regp = fpregsetp->regs;
206 for (regi = 0; regi < 32; regi++)
207 supply_register (regi + FP0_REGNUM, (char *)(regp + regi));
211 fill_fpregset (fpregsetp, regno)
212 fpregset_t *fpregsetp;
216 register long *regp = fpregsetp->regs;
218 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
220 if ((regno == -1) || (regno == regi))
222 *(regp + regi - FP0_REGNUM) =
223 *(long *) ®isters[REGISTER_BYTE (regi)];
230 /* Register that we are able to handle alpha core file formats. */
232 static struct core_fns alpha_core_fns =
234 bfd_target_aout_flavour,
235 fetch_core_registers,
240 _initialize_core_alpha ()
242 add_core_fns (&alpha_core_fns);