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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 24 25 26 #include "defs.h" 27 #include "inferior.h" 28 #include "target.h" 29 #include <sys/ptrace.h> 30 #include "gdbcore.h" 31 32 extern CORE_ADDR text_end; 33 34 static void fetch_register PARAMS ((int)); 35 36 void 37 fetch_inferior_registers (regno) 38 int regno; 39 { 40 if (regno == -1) 41 for (regno = 0; regno < NUM_REGS; regno++) 42 fetch_register (regno); 43 else 44 fetch_register (regno); 45 } 46 47 /* Store our register values back into the inferior. 48 If REGNO is -1, do this for all registers. 49 Otherwise, REGNO specifies which register (so we can save time). */ 50 51 void 52 store_inferior_registers (regno) 53 int regno; 54 { 55 register unsigned int regaddr; 56 char buf[80]; 57 extern char registers[]; 58 register int i; 59 unsigned int offset = U_REGS_OFFSET; 60 int scratch; 61 62 if (regno >= 0) 63 { 64 if (CANNOT_STORE_REGISTER (regno)) 65 return; 66 regaddr = register_addr (regno, offset); 67 errno = 0; 68 if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) 69 { 70 scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; 71 call_ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 72 scratch); 73 if (errno != 0) 74 { 75 /* Error, even if attached. Failing to write these two 76 registers is pretty serious. */ 77 sprintf (buf, "writing register number %d", regno); 78 perror_with_name (buf); 79 } 80 } 81 else 82 for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) 83 { 84 errno = 0; 85 call_ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 86 *(int *) ®isters[REGISTER_BYTE (regno) + i]); 87 if (errno != 0) 88 { 89 /* Warning, not error, in case we are attached; sometimes the 90 kernel doesn't let us at the registers. */ 91 char *err = safe_strerror (errno); 92 char *msg = alloca (strlen (err) + 128); 93 sprintf (msg, "writing register %s: %s", 94 reg_names[regno], err); 95 warning (msg); 96 return; 97 } 98 regaddr += sizeof(int); 99 } 100 } 101 else 102 for (regno = 0; regno < NUM_REGS; regno++) 103 store_inferior_registers (regno); 104 } 105 106 /* Fetch one register. */ 107 108 static void 109 fetch_register (regno) 110 int regno; 111 { 112 register unsigned int regaddr; 113 char buf[MAX_REGISTER_RAW_SIZE]; 114 register int i; 115 116 /* Offset of registers within the u area. */ 117 unsigned int offset; 118 119 offset = U_REGS_OFFSET; 120 121 regaddr = register_addr (regno, offset); 122 for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) 123 { 124 errno = 0; 125 *(int *) &buf[i] = call_ptrace (PT_RUREGS, inferior_pid, 126 (PTRACE_ARG3_TYPE) regaddr, 0); 127 regaddr += sizeof (int); 128 if (errno != 0) 129 { 130 /* Warning, not error, in case we are attached; sometimes the 131 kernel doesn't let us at the registers. */ 132 char *err = safe_strerror (errno); 133 char *msg = alloca (strlen (err) + 128); 134 sprintf (msg, "reading register %s: %s", reg_names[regno], err); 135 warning (msg); 136 goto error_exit; 137 } 138 } 139 if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) 140 buf[3] &= ~0x3; 141 supply_register (regno, buf); 142 error_exit:; 143 } 144 145 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR 146 to debugger memory starting at MYADDR. Copy to inferior if 147 WRITE is nonzero. 148 149 Returns the length copied, which is either the LEN argument or zero. 150 This xfer function does not do partial moves, since child_ops 151 doesn't allow memory operations to cross below us in the target stack 152 anyway. */ 153 154 int 155 child_xfer_memory (memaddr, myaddr, len, write, target) 156 CORE_ADDR memaddr; 157 char *myaddr; 158 int len; 159 int write; 160 struct target_ops *target; /* ignored */ 161 { 162 register int i; 163 /* Round starting address down to longword boundary. */ 164 register CORE_ADDR addr = memaddr & - sizeof (int); 165 /* Round ending address up; get number of longwords that makes. */ 166 register int count 167 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); 168 /* Allocate buffer of that many longwords. */ 169 register int *buffer = (int *) alloca (count * sizeof (int)); 170 171 if (write) 172 { 173 /* Fill start and end extra bytes of buffer with existing memory data. */ 174 175 if (addr != memaddr || len < (int)sizeof (int)) { 176 /* Need part of initial word -- fetch it. */ 177 buffer[0] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, 178 inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); 179 } 180 181 if (count > 1) /* FIXME, avoid if even boundary */ 182 { 183 buffer[count - 1] 184 = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, inferior_pid, 185 (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), 186 0); 187 } 188 189 /* Copy data to be written over corresponding part of buffer */ 190 191 memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); 192 193 /* Write the entire buffer. */ 194 195 for (i = 0; i < count; i++, addr += sizeof (int)) 196 { 197 /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text 198 segment. FIXME -- does it work to write into the data segment using 199 WIUSER, or do these idiots really expect us to figure out which segment 200 the address is in, so we can use a separate system call for it??! */ 201 errno = 0; 202 call_ptrace (addr < text_end ? PT_WIUSER : PT_WDUSER, inferior_pid, 203 (PTRACE_ARG3_TYPE) addr, 204 buffer[i]); 205 if (errno) 206 return 0; 207 } 208 } 209 else 210 { 211 /* Read all the longwords */ 212 for (i = 0; i < count; i++, addr += sizeof (int)) 213 { 214 errno = 0; 215 buffer[i] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, 216 inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); 217 if (errno) 218 return 0; 219 QUIT; 220 } 221 222 /* Copy appropriate bytes out of the buffer. */ 223 memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); 224 } 225 return len; 226 } 227