| 1 | /* Low level DECstation interface to ptrace, for GDB when running native. |
| 2 | Copyright 1988, 1989, 1991, 1992, 1995 Free Software Foundation, Inc. |
| 3 | Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU |
| 4 | and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 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 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 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. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "inferior.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include <sys/ptrace.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/param.h> |
| 29 | #include <sys/user.h> |
| 30 | #undef JB_S0 |
| 31 | #undef JB_S1 |
| 32 | #undef JB_S2 |
| 33 | #undef JB_S3 |
| 34 | #undef JB_S4 |
| 35 | #undef JB_S5 |
| 36 | #undef JB_S6 |
| 37 | #undef JB_S7 |
| 38 | #undef JB_SP |
| 39 | #undef JB_S8 |
| 40 | #undef JB_PC |
| 41 | #undef JB_SR |
| 42 | #undef NJBREGS |
| 43 | #include <setjmp.h> /* For JB_XXX. */ |
| 44 | |
| 45 | /* Size of elements in jmpbuf */ |
| 46 | |
| 47 | #define JB_ELEMENT_SIZE 4 |
| 48 | |
| 49 | /* Map gdb internal register number to ptrace ``address''. |
| 50 | These ``addresses'' are defined in DECstation <sys/ptrace.h> */ |
| 51 | |
| 52 | #define REGISTER_PTRACE_ADDR(regno) \ |
| 53 | (regno < 32 ? GPR_BASE + regno \ |
| 54 | : regno == PC_REGNUM ? PC \ |
| 55 | : regno == CAUSE_REGNUM ? CAUSE \ |
| 56 | : regno == HI_REGNUM ? MMHI \ |
| 57 | : regno == LO_REGNUM ? MMLO \ |
| 58 | : regno == FCRCS_REGNUM ? FPC_CSR \ |
| 59 | : regno == FCRIR_REGNUM ? FPC_EIR \ |
| 60 | : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \ |
| 61 | : 0) |
| 62 | |
| 63 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = |
| 64 | {0}; |
| 65 | |
| 66 | static void fetch_core_registers (char *, unsigned, int, CORE_ADDR); |
| 67 | |
| 68 | /* Get all registers from the inferior */ |
| 69 | |
| 70 | void |
| 71 | fetch_inferior_registers (int regno) |
| 72 | { |
| 73 | register unsigned int regaddr; |
| 74 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 75 | register int i; |
| 76 | |
| 77 | registers_fetched (); |
| 78 | |
| 79 | for (regno = 1; regno < NUM_REGS; regno++) |
| 80 | { |
| 81 | regaddr = REGISTER_PTRACE_ADDR (regno); |
| 82 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
| 83 | { |
| 84 | *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid, |
| 85 | (PTRACE_ARG3_TYPE) regaddr, 0); |
| 86 | regaddr += sizeof (int); |
| 87 | } |
| 88 | supply_register (regno, buf); |
| 89 | } |
| 90 | |
| 91 | supply_register (ZERO_REGNUM, zerobuf); |
| 92 | /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ |
| 93 | supply_register (FP_REGNUM, zerobuf); |
| 94 | } |
| 95 | |
| 96 | /* Store our register values back into the inferior. |
| 97 | If REGNO is -1, do this for all registers. |
| 98 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 99 | |
| 100 | void |
| 101 | store_inferior_registers (int regno) |
| 102 | { |
| 103 | register unsigned int regaddr; |
| 104 | char buf[80]; |
| 105 | |
| 106 | if (regno > 0) |
| 107 | { |
| 108 | if (regno == ZERO_REGNUM || regno == PS_REGNUM |
| 109 | || regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM |
| 110 | || regno == FCRIR_REGNUM || regno == FP_REGNUM |
| 111 | || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM)) |
| 112 | return; |
| 113 | regaddr = REGISTER_PTRACE_ADDR (regno); |
| 114 | errno = 0; |
| 115 | ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
| 116 | read_register (regno)); |
| 117 | if (errno != 0) |
| 118 | { |
| 119 | sprintf (buf, "writing register number %d", regno); |
| 120 | perror_with_name (buf); |
| 121 | } |
| 122 | } |
| 123 | else |
| 124 | { |
| 125 | for (regno = 0; regno < NUM_REGS; regno++) |
| 126 | store_inferior_registers (regno); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | |
| 131 | /* Figure out where the longjmp will land. |
| 132 | We expect the first arg to be a pointer to the jmp_buf structure from which |
| 133 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. |
| 134 | This routine returns true on success. */ |
| 135 | |
| 136 | int |
| 137 | get_longjmp_target (CORE_ADDR *pc) |
| 138 | { |
| 139 | CORE_ADDR jb_addr; |
| 140 | char *buf; |
| 141 | |
| 142 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 143 | jb_addr = read_register (A0_REGNUM); |
| 144 | |
| 145 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, |
| 146 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 147 | return 0; |
| 148 | |
| 149 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 150 | |
| 151 | return 1; |
| 152 | } |
| 153 | |
| 154 | /* Extract the register values out of the core file and store |
| 155 | them where `read_register' will find them. |
| 156 | |
| 157 | CORE_REG_SECT points to the register values themselves, read into memory. |
| 158 | CORE_REG_SIZE is the size of that area. |
| 159 | WHICH says which set of registers we are handling (0 = int, 2 = float |
| 160 | on machines where they are discontiguous). |
| 161 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
| 162 | core_reg_sect. This is used with old-fashioned core files to |
| 163 | locate the registers in a large upage-plus-stack ".reg" section. |
| 164 | Original upage address X is at location core_reg_sect+x+reg_addr. |
| 165 | */ |
| 166 | |
| 167 | static void |
| 168 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| 169 | CORE_ADDR reg_addr) |
| 170 | { |
| 171 | register int regno; |
| 172 | register unsigned int addr; |
| 173 | int bad_reg = -1; |
| 174 | register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ |
| 175 | |
| 176 | /* If u.u_ar0 was an absolute address in the core file, relativize it now, |
| 177 | so we can use it as an offset into core_reg_sect. When we're done, |
| 178 | "register 0" will be at core_reg_sect+reg_ptr, and we can use |
| 179 | register_addr to offset to the other registers. If this is a modern |
| 180 | core file without a upage, reg_ptr will be zero and this is all a big |
| 181 | NOP. */ |
| 182 | if (reg_ptr > core_reg_size) |
| 183 | #ifdef KERNEL_U_ADDR |
| 184 | reg_ptr -= KERNEL_U_ADDR; |
| 185 | #else |
| 186 | error ("Old mips core file can't be processed on this machine."); |
| 187 | #endif |
| 188 | |
| 189 | for (regno = 0; regno < NUM_REGS; regno++) |
| 190 | { |
| 191 | addr = register_addr (regno, reg_ptr); |
| 192 | if (addr >= core_reg_size) |
| 193 | { |
| 194 | if (bad_reg < 0) |
| 195 | bad_reg = regno; |
| 196 | } |
| 197 | else |
| 198 | { |
| 199 | supply_register (regno, core_reg_sect + addr); |
| 200 | } |
| 201 | } |
| 202 | if (bad_reg >= 0) |
| 203 | { |
| 204 | error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); |
| 205 | } |
| 206 | supply_register (ZERO_REGNUM, zerobuf); |
| 207 | /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ |
| 208 | supply_register (FP_REGNUM, zerobuf); |
| 209 | } |
| 210 | |
| 211 | /* Return the address in the core dump or inferior of register REGNO. |
| 212 | BLOCKEND is the address of the end of the user structure. */ |
| 213 | |
| 214 | CORE_ADDR |
| 215 | register_addr (int regno, CORE_ADDR blockend) |
| 216 | { |
| 217 | CORE_ADDR addr; |
| 218 | |
| 219 | if (regno < 0 || regno >= NUM_REGS) |
| 220 | error ("Invalid register number %d.", regno); |
| 221 | |
| 222 | REGISTER_U_ADDR (addr, blockend, regno); |
| 223 | |
| 224 | return addr; |
| 225 | } |
| 226 | \f |
| 227 | |
| 228 | /* Register that we are able to handle mips core file formats. |
| 229 | FIXME: is this really bfd_target_unknown_flavour? */ |
| 230 | |
| 231 | static struct core_fns mips_core_fns = |
| 232 | { |
| 233 | bfd_target_unknown_flavour, /* core_flavour */ |
| 234 | default_check_format, /* check_format */ |
| 235 | default_core_sniffer, /* core_sniffer */ |
| 236 | fetch_core_registers, /* core_read_registers */ |
| 237 | NULL /* next */ |
| 238 | }; |
| 239 | |
| 240 | void |
| 241 | _initialize_core_mips (void) |
| 242 | { |
| 243 | add_core_fns (&mips_core_fns); |
| 244 | } |