1 /* Low level Alpha interface, for GDB when running native. 2 Copyright 1993, 1995, 1996 Free Software Foundation, Inc. 3 4 This file is part of GDB. 5 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. 10 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. 15 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. */ 19 20 #include "defs.h" 21 #include "inferior.h" 22 #include "gdbcore.h" 23 #include "target.h" 24 #include <sys/ptrace.h> 25 #ifdef __linux__ 26 # include <asm/reg.h> 27 # include <alpha/ptrace.h> 28 #else 29 # include <machine/reg.h> 30 #endif 31 #include <sys/user.h> 32 33 static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR)); 34 35 /* Size of elements in jmpbuf */ 36 37 #define JB_ELEMENT_SIZE 8 38 39 /* The definition for JB_PC in machine/reg.h is wrong. 40 And we can't get at the correct definition in setjmp.h as it is 41 not always available (eg. if _POSIX_SOURCE is defined which is the 42 default). As the defintion is unlikely to change (see comment 43 in <setjmp.h>, define the correct value here. */ 44 45 #undef JB_PC 46 #define JB_PC 2 47 48 /* Figure out where the longjmp will land. 49 We expect the first arg to be a pointer to the jmp_buf structure from which 50 we extract the pc (JB_PC) that we will land at. The pc is copied into PC. 51 This routine returns true on success. */ 52 53 int 54 get_longjmp_target (pc) 55 CORE_ADDR *pc; 56 { 57 CORE_ADDR jb_addr; 58 char raw_buffer[MAX_REGISTER_RAW_SIZE]; 59 60 jb_addr = read_register(A0_REGNUM); 61 62 if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer, 63 sizeof(CORE_ADDR))) 64 return 0; 65 66 *pc = extract_address (raw_buffer, sizeof(CORE_ADDR)); 67 return 1; 68 } 69 70 /* Extract the register values out of the core file and store 71 them where `read_register' will find them. 72 73 CORE_REG_SECT points to the register values themselves, read into memory. 74 CORE_REG_SIZE is the size of that area. 75 WHICH says which set of registers we are handling (0 = int, 2 = float 76 on machines where they are discontiguous). 77 REG_ADDR is the offset from u.u_ar0 to the register values relative to 78 core_reg_sect. This is used with old-fashioned core files to 79 locate the registers in a large upage-plus-stack ".reg" section. 80 Original upage address X is at location core_reg_sect+x+reg_addr. 81 */ 82 83 static void 84 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) 85 char *core_reg_sect; 86 unsigned core_reg_size; 87 int which; 88 CORE_ADDR reg_addr; 89 { 90 register int regno; 91 register int addr; 92 int bad_reg = -1; 93 94 /* Table to map a gdb regnum to an index in the core register section. 95 The floating point register values are garbage in OSF/1.2 core files. */ 96 static int core_reg_mapping[NUM_REGS] = 97 { 98 #define EFL (EF_SIZE / 8) 99 EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6, 100 EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6, 101 EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9, 102 EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1, 103 EFL+0, EFL+1, EFL+2, EFL+3, EFL+4, EFL+5, EFL+6, EFL+7, 104 EFL+8, EFL+9, EFL+10, EFL+11, EFL+12, EFL+13, EFL+14, EFL+15, 105 EFL+16, EFL+17, EFL+18, EFL+19, EFL+20, EFL+21, EFL+22, EFL+23, 106 EFL+24, EFL+25, EFL+26, EFL+27, EFL+28, EFL+29, EFL+30, EFL+31, 107 EF_PC, -1 108 }; 109 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; 110 111 for (regno = 0; regno < NUM_REGS; regno++) 112 { 113 if (CANNOT_FETCH_REGISTER (regno)) 114 { 115 supply_register (regno, zerobuf); 116 continue; 117 } 118 addr = 8 * core_reg_mapping[regno]; 119 if (addr < 0 || addr >= core_reg_size) 120 { 121 if (bad_reg < 0) 122 bad_reg = regno; 123 } 124 else 125 { 126 supply_register (regno, core_reg_sect + addr); 127 } 128 } 129 if (bad_reg >= 0) 130 { 131 error ("Register %s not found in core file.", reg_names[bad_reg]); 132 } 133 } 134 135 /* Map gdb internal register number to a ptrace ``address''. 136 These ``addresses'' are defined in <sys/ptrace.h> */ 137 138 #define REGISTER_PTRACE_ADDR(regno) \ 139 (regno < FP0_REGNUM ? GPR_BASE + (regno) \ 140 : regno == PC_REGNUM ? PC \ 141 : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \ 142 : 0) 143 144 /* Return the ptrace ``address'' of register REGNO. */ 145 146 CORE_ADDR 147 register_addr (regno, blockend) 148 int regno; 149 CORE_ADDR blockend; 150 { 151 return REGISTER_PTRACE_ADDR (regno); 152 } 153 154 int 155 kernel_u_size () 156 { 157 return (sizeof (struct user)); 158 } 159 160 #ifdef USE_PROC_FS 161 #include <sys/procfs.h> 162 163 /* 164 * See the comment in m68k-tdep.c regarding the utility of these functions. 165 */ 166 167 void 168 supply_gregset (gregsetp) 169 gregset_t *gregsetp; 170 { 171 register int regi; 172 register long *regp = gregsetp->regs; 173 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; 174 175 for (regi = 0; regi < 31; regi++) 176 supply_register (regi, (char *)(regp + regi)); 177 178 supply_register (PC_REGNUM, (char *)(regp + 31)); 179 180 /* Fill inaccessible registers with zero. */ 181 supply_register (ZERO_REGNUM, zerobuf); 182 supply_register (FP_REGNUM, zerobuf); 183 } 184 185 void 186 fill_gregset (gregsetp, regno) 187 gregset_t *gregsetp; 188 int regno; 189 { 190 int regi; 191 register long *regp = gregsetp->regs; 192 193 for (regi = 0; regi < 31; regi++) 194 if ((regno == -1) || (regno == regi)) 195 *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)]; 196 197 if ((regno == -1) || (regno == PC_REGNUM)) 198 *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)]; 199 } 200 201 /* 202 * Now we do the same thing for floating-point registers. 203 * Again, see the comments in m68k-tdep.c. 204 */ 205 206 void 207 supply_fpregset (fpregsetp) 208 fpregset_t *fpregsetp; 209 { 210 register int regi; 211 register long *regp = fpregsetp->regs; 212 213 for (regi = 0; regi < 32; regi++) 214 supply_register (regi + FP0_REGNUM, (char *)(regp + regi)); 215 } 216 217 void 218 fill_fpregset (fpregsetp, regno) 219 fpregset_t *fpregsetp; 220 int regno; 221 { 222 int regi; 223 register long *regp = fpregsetp->regs; 224 225 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) 226 { 227 if ((regno == -1) || (regno == regi)) 228 { 229 *(regp + regi - FP0_REGNUM) = 230 *(long *) ®isters[REGISTER_BYTE (regi)]; 231 } 232 } 233 } 234 #endif 235 236 237 /* Register that we are able to handle alpha core file formats. */ 238 239 static struct core_fns alpha_core_fns = 240 { 241 bfd_target_aout_flavour, 242 fetch_core_registers, 243 NULL 244 }; 245 246 void 247 _initialize_core_alpha () 248 { 249 add_core_fns (&alpha_core_fns); 250 } 251