| 1 | /* Low level DECstation interface to ptrace, for GDB when running native. |
| 2 | Copyright 1988, 1989, 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "inferior.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include <sys/ptrace.h> |
| 26 | #include <sys/types.h> |
| 27 | #include <sys/param.h> |
| 28 | #include <sys/user.h> |
| 29 | #undef JB_S0 |
| 30 | #undef JB_S1 |
| 31 | #undef JB_S2 |
| 32 | #undef JB_S3 |
| 33 | #undef JB_S4 |
| 34 | #undef JB_S5 |
| 35 | #undef JB_S6 |
| 36 | #undef JB_S7 |
| 37 | #undef JB_SP |
| 38 | #undef JB_S8 |
| 39 | #undef JB_PC |
| 40 | #undef JB_SR |
| 41 | #undef NJBREGS |
| 42 | #include <setjmp.h> /* For JB_XXX. */ |
| 43 | |
| 44 | /* Size of elements in jmpbuf */ |
| 45 | |
| 46 | #define JB_ELEMENT_SIZE 4 |
| 47 | |
| 48 | /* Map gdb internal register number to ptrace ``address''. |
| 49 | These ``addresses'' are defined in DECstation <sys/ptrace.h> */ |
| 50 | |
| 51 | #define REGISTER_PTRACE_ADDR(regno) \ |
| 52 | (regno < 32 ? GPR_BASE + regno \ |
| 53 | : regno == PC_REGNUM ? PC \ |
| 54 | : regno == CAUSE_REGNUM ? CAUSE \ |
| 55 | : regno == HI_REGNUM ? MMHI \ |
| 56 | : regno == LO_REGNUM ? MMLO \ |
| 57 | : regno == FCRCS_REGNUM ? FPC_CSR \ |
| 58 | : regno == FCRIR_REGNUM ? FPC_EIR \ |
| 59 | : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \ |
| 60 | : 0) |
| 61 | |
| 62 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; |
| 63 | |
| 64 | /* Get all registers from the inferior */ |
| 65 | |
| 66 | void |
| 67 | fetch_inferior_registers (regno) |
| 68 | int regno; |
| 69 | { |
| 70 | register unsigned int regaddr; |
| 71 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 72 | register int i; |
| 73 | |
| 74 | registers_fetched (); |
| 75 | |
| 76 | for (regno = 1; regno < NUM_REGS; regno++) |
| 77 | { |
| 78 | regaddr = REGISTER_PTRACE_ADDR (regno); |
| 79 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
| 80 | { |
| 81 | *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid, |
| 82 | (PTRACE_ARG3_TYPE) regaddr, 0); |
| 83 | regaddr += sizeof (int); |
| 84 | } |
| 85 | supply_register (regno, buf); |
| 86 | } |
| 87 | |
| 88 | supply_register (ZERO_REGNUM, zerobuf); |
| 89 | /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ |
| 90 | supply_register (FP_REGNUM, zerobuf); |
| 91 | } |
| 92 | |
| 93 | /* Store our register values back into the inferior. |
| 94 | If REGNO is -1, do this for all registers. |
| 95 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 96 | |
| 97 | void |
| 98 | store_inferior_registers (regno) |
| 99 | int regno; |
| 100 | { |
| 101 | register unsigned int regaddr; |
| 102 | char buf[80]; |
| 103 | |
| 104 | if (regno == 0) |
| 105 | return; |
| 106 | |
| 107 | if (regno > 0) |
| 108 | { |
| 109 | regaddr = REGISTER_PTRACE_ADDR (regno); |
| 110 | errno = 0; |
| 111 | ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
| 112 | read_register (regno)); |
| 113 | if (errno != 0) |
| 114 | { |
| 115 | sprintf (buf, "writing register number %d", regno); |
| 116 | perror_with_name (buf); |
| 117 | } |
| 118 | } |
| 119 | else |
| 120 | { |
| 121 | for (regno = 0; regno < NUM_REGS; regno++) |
| 122 | { |
| 123 | if (regno == ZERO_REGNUM || regno == PS_REGNUM |
| 124 | || regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM |
| 125 | || regno == FCRIR_REGNUM || regno == FP_REGNUM |
| 126 | || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM)) |
| 127 | continue; |
| 128 | regaddr = REGISTER_PTRACE_ADDR (regno); |
| 129 | errno = 0; |
| 130 | ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
| 131 | read_register (regno)); |
| 132 | if (errno != 0) |
| 133 | { |
| 134 | sprintf (buf, "writing all regs, number %d", regno); |
| 135 | perror_with_name (buf); |
| 136 | } |
| 137 | } |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | |
| 142 | /* Figure out where the longjmp will land. |
| 143 | We expect the first arg to be a pointer to the jmp_buf structure from which |
| 144 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. |
| 145 | This routine returns true on success. */ |
| 146 | |
| 147 | int |
| 148 | get_longjmp_target(pc) |
| 149 | CORE_ADDR *pc; |
| 150 | { |
| 151 | CORE_ADDR jb_addr; |
| 152 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; |
| 153 | |
| 154 | jb_addr = read_register (A0_REGNUM); |
| 155 | |
| 156 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, |
| 157 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 158 | return 0; |
| 159 | |
| 160 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 161 | |
| 162 | return 1; |
| 163 | } |
| 164 | |
| 165 | /* Extract the register values out of the core file and store |
| 166 | them where `read_register' will find them. |
| 167 | |
| 168 | CORE_REG_SECT points to the register values themselves, read into memory. |
| 169 | CORE_REG_SIZE is the size of that area. |
| 170 | WHICH says which set of registers we are handling (0 = int, 2 = float |
| 171 | on machines where they are discontiguous). |
| 172 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
| 173 | core_reg_sect. This is used with old-fashioned core files to |
| 174 | locate the registers in a large upage-plus-stack ".reg" section. |
| 175 | Original upage address X is at location core_reg_sect+x+reg_addr. |
| 176 | */ |
| 177 | |
| 178 | void |
| 179 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
| 180 | char *core_reg_sect; |
| 181 | unsigned core_reg_size; |
| 182 | int which; |
| 183 | unsigned reg_addr; |
| 184 | { |
| 185 | register int regno; |
| 186 | register unsigned int addr; |
| 187 | int bad_reg = -1; |
| 188 | register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ |
| 189 | |
| 190 | /* If u.u_ar0 was an absolute address in the core file, relativize it now, |
| 191 | so we can use it as an offset into core_reg_sect. When we're done, |
| 192 | "register 0" will be at core_reg_sect+reg_ptr, and we can use |
| 193 | register_addr to offset to the other registers. If this is a modern |
| 194 | core file without a upage, reg_ptr will be zero and this is all a big |
| 195 | NOP. */ |
| 196 | if (reg_ptr > core_reg_size) |
| 197 | #ifdef KERNEL_U_ADDR |
| 198 | reg_ptr -= KERNEL_U_ADDR; |
| 199 | #else |
| 200 | error ("Old mips core file can't be processed on this machine."); |
| 201 | #endif |
| 202 | |
| 203 | for (regno = 0; regno < NUM_REGS; regno++) |
| 204 | { |
| 205 | addr = register_addr (regno, reg_ptr); |
| 206 | if (addr >= core_reg_size) { |
| 207 | if (bad_reg < 0) |
| 208 | bad_reg = regno; |
| 209 | } else { |
| 210 | supply_register (regno, core_reg_sect + addr); |
| 211 | } |
| 212 | } |
| 213 | if (bad_reg >= 0) |
| 214 | { |
| 215 | error ("Register %s not found in core file.", reg_names[bad_reg]); |
| 216 | } |
| 217 | supply_register (ZERO_REGNUM, zerobuf); |
| 218 | /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ |
| 219 | supply_register (FP_REGNUM, zerobuf); |
| 220 | } |
| 221 | |
| 222 | /* Return the address in the core dump or inferior of register REGNO. |
| 223 | BLOCKEND is the address of the end of the user structure. */ |
| 224 | |
| 225 | unsigned int |
| 226 | register_addr (regno, blockend) |
| 227 | int regno; |
| 228 | int blockend; |
| 229 | { |
| 230 | int addr; |
| 231 | |
| 232 | if (regno < 0 || regno >= NUM_REGS) |
| 233 | error ("Invalid register number %d.", regno); |
| 234 | |
| 235 | REGISTER_U_ADDR (addr, blockend, regno); |
| 236 | |
| 237 | return addr; |
| 238 | } |