| 1 | /* Machine-dependent hooks for the unix child process stratum, for HPUX PA-RISC. |
| 2 | |
| 3 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | Contributed by the Center for Software Science at the |
| 7 | University of Utah (pa-gdb-bugs@cs.utah.edu). |
| 8 | |
| 9 | This file is part of GDB. |
| 10 | |
| 11 | This program is free software; you can redistribute it and/or modify |
| 12 | it under the terms of the GNU General Public License as published by |
| 13 | the Free Software Foundation; either version 2 of the License, or |
| 14 | (at your option) any later version. |
| 15 | |
| 16 | This program is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | GNU General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with this program; if not, write to the Free Software |
| 23 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 24 | |
| 25 | |
| 26 | #include "defs.h" |
| 27 | #include "inferior.h" |
| 28 | #include "target.h" |
| 29 | #include <sys/ptrace.h> |
| 30 | |
| 31 | extern CORE_ADDR text_end; |
| 32 | |
| 33 | static void fetch_register (); |
| 34 | |
| 35 | void |
| 36 | fetch_inferior_registers (regno) |
| 37 | int regno; |
| 38 | { |
| 39 | if (regno == -1) |
| 40 | for (regno = 0; regno < NUM_REGS; regno++) |
| 41 | fetch_register (regno); |
| 42 | else |
| 43 | fetch_register (regno); |
| 44 | } |
| 45 | |
| 46 | /* Store our register values back into the inferior. |
| 47 | If REGNO is -1, do this for all registers. |
| 48 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 49 | |
| 50 | void |
| 51 | store_inferior_registers (regno) |
| 52 | int regno; |
| 53 | { |
| 54 | register unsigned int regaddr; |
| 55 | char buf[80]; |
| 56 | extern char registers[]; |
| 57 | register int i; |
| 58 | unsigned int offset = U_REGS_OFFSET; |
| 59 | int scratch; |
| 60 | |
| 61 | if (regno >= 0) |
| 62 | { |
| 63 | regaddr = register_addr (regno, offset); |
| 64 | errno = 0; |
| 65 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
| 66 | { |
| 67 | scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; |
| 68 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
| 69 | scratch, 0); |
| 70 | if (errno != 0) |
| 71 | { |
| 72 | /* Error, even if attached. Failing to write these two |
| 73 | registers is pretty serious. */ |
| 74 | sprintf (buf, "writing register number %d", regno); |
| 75 | perror_with_name (buf); |
| 76 | } |
| 77 | } |
| 78 | else |
| 79 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) |
| 80 | { |
| 81 | errno = 0; |
| 82 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
| 83 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); |
| 84 | if (errno != 0) |
| 85 | { |
| 86 | /* Warning, not error, in case we are attached; sometimes the |
| 87 | kernel doesn't let us at the registers. */ |
| 88 | char *err = safe_strerror (errno); |
| 89 | char *msg = alloca (strlen (err) + 128); |
| 90 | sprintf (msg, "writing register %s: %s", |
| 91 | reg_names[regno], err); |
| 92 | warning (msg); |
| 93 | goto error_exit; |
| 94 | } |
| 95 | regaddr += sizeof(int); |
| 96 | } |
| 97 | } |
| 98 | else |
| 99 | { |
| 100 | for (regno = 0; regno < NUM_REGS; regno++) |
| 101 | { |
| 102 | if (CANNOT_STORE_REGISTER (regno)) |
| 103 | continue; |
| 104 | store_inferior_registers (regno); |
| 105 | } |
| 106 | } |
| 107 | error_exit: |
| 108 | return; |
| 109 | } |
| 110 | |
| 111 | /* Fetch one register. */ |
| 112 | |
| 113 | static void |
| 114 | fetch_register (regno) |
| 115 | int regno; |
| 116 | { |
| 117 | register unsigned int regaddr; |
| 118 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 119 | char mess[128]; /* For messages */ |
| 120 | register int i; |
| 121 | |
| 122 | /* Offset of registers within the u area. */ |
| 123 | unsigned int offset; |
| 124 | |
| 125 | offset = U_REGS_OFFSET; |
| 126 | |
| 127 | regaddr = register_addr (regno, offset); |
| 128 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
| 129 | { |
| 130 | errno = 0; |
| 131 | *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid, |
| 132 | (PTRACE_ARG3_TYPE) regaddr, 0, 0); |
| 133 | regaddr += sizeof (int); |
| 134 | if (errno != 0) |
| 135 | { |
| 136 | /* Warning, not error, in case we are attached; sometimes the |
| 137 | kernel doesn't let us at the registers. */ |
| 138 | char *err = safe_strerror (errno); |
| 139 | char *msg = alloca (strlen (err) + 128); |
| 140 | sprintf (msg, "reading register %s: %s", reg_names[regno], err); |
| 141 | warning (msg); |
| 142 | goto error_exit; |
| 143 | } |
| 144 | } |
| 145 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
| 146 | buf[3] &= ~0x3; |
| 147 | supply_register (regno, buf); |
| 148 | error_exit:; |
| 149 | } |
| 150 | |
| 151 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR |
| 152 | to debugger memory starting at MYADDR. Copy to inferior if |
| 153 | WRITE is nonzero. |
| 154 | |
| 155 | Returns the length copied, which is either the LEN argument or zero. |
| 156 | This xfer function does not do partial moves, since child_ops |
| 157 | doesn't allow memory operations to cross below us in the target stack |
| 158 | anyway. */ |
| 159 | |
| 160 | int |
| 161 | child_xfer_memory (memaddr, myaddr, len, write, target) |
| 162 | CORE_ADDR memaddr; |
| 163 | char *myaddr; |
| 164 | int len; |
| 165 | int write; |
| 166 | struct target_ops *target; /* ignored */ |
| 167 | { |
| 168 | register int i; |
| 169 | /* Round starting address down to longword boundary. */ |
| 170 | register CORE_ADDR addr = memaddr & - sizeof (int); |
| 171 | /* Round ending address up; get number of longwords that makes. */ |
| 172 | register int count |
| 173 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
| 174 | /* Allocate buffer of that many longwords. */ |
| 175 | register int *buffer = (int *) alloca (count * sizeof (int)); |
| 176 | |
| 177 | if (write) |
| 178 | { |
| 179 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
| 180 | |
| 181 | if (addr != memaddr || len < (int)sizeof (int)) { |
| 182 | /* Need part of initial word -- fetch it. */ |
| 183 | buffer[0] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| 184 | inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0); |
| 185 | } |
| 186 | |
| 187 | if (count > 1) /* FIXME, avoid if even boundary */ |
| 188 | { |
| 189 | buffer[count - 1] |
| 190 | = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, inferior_pid, |
| 191 | (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), |
| 192 | 0, 0); |
| 193 | } |
| 194 | |
| 195 | /* Copy data to be written over corresponding part of buffer */ |
| 196 | |
| 197 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
| 198 | |
| 199 | /* Write the entire buffer. */ |
| 200 | |
| 201 | for (i = 0; i < count; i++, addr += sizeof (int)) |
| 202 | { |
| 203 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text |
| 204 | segment. FIXME -- does it work to write into the data segment using |
| 205 | WIUSER, or do these idiots really expect us to figure out which segment |
| 206 | the address is in, so we can use a separate system call for it??! */ |
| 207 | errno = 0; |
| 208 | ptrace (addr < text_end ? PT_WIUSER : PT_WDUSER, inferior_pid, |
| 209 | (PTRACE_ARG3_TYPE) addr, |
| 210 | buffer[i], 0); |
| 211 | if (errno) |
| 212 | return 0; |
| 213 | } |
| 214 | } |
| 215 | else |
| 216 | { |
| 217 | /* Read all the longwords */ |
| 218 | for (i = 0; i < count; i++, addr += sizeof (int)) |
| 219 | { |
| 220 | errno = 0; |
| 221 | buffer[i] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| 222 | inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0); |
| 223 | if (errno) |
| 224 | return 0; |
| 225 | QUIT; |
| 226 | } |
| 227 | |
| 228 | /* Copy appropriate bytes out of the buffer. */ |
| 229 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
| 230 | } |
| 231 | return len; |
| 232 | } |