/* Machine-dependent hooks for the unix child process stratum, for HPUX PA-RISC. Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc. Contributed by the Center for Software Science at the University of Utah (pa-gdb-bugs@cs.utah.edu). This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "defs.h" #include "inferior.h" #include "target.h" #include <sys/ptrace.h> extern CORE_ADDR text_end; static void fetch_register (); void fetch_inferior_registers (regno) int regno; { if (regno == -1) for (regno = 0; regno < NUM_REGS; regno++) fetch_register (regno); else fetch_register (regno); } /* Store our register values back into the inferior. If REGNO is -1, do this for all registers. Otherwise, REGNO specifies which register (so we can save time). */ void store_inferior_registers (regno) int regno; { register unsigned int regaddr; char buf[80]; extern char registers[]; register int i; unsigned int offset = U_REGS_OFFSET; int scratch; if (regno >= 0) { regaddr = register_addr (regno, offset); errno = 0; if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) { scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, scratch, 0); if (errno != 0) { /* Error, even if attached. Failing to write these two registers is pretty serious. */ sprintf (buf, "writing register number %d", regno); perror_with_name (buf); } } else for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) { errno = 0; ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); if (errno != 0) { /* Warning, not error, in case we are attached; sometimes the kernel doesn't let us at the registers. */ char *err = safe_strerror (errno); char *msg = alloca (strlen (err) + 128); sprintf (msg, "writing register %s: %s", reg_names[regno], err); warning (msg); goto error_exit; } regaddr += sizeof(int); } } else { for (regno = 0; regno < NUM_REGS; regno++) { if (CANNOT_STORE_REGISTER (regno)) continue; store_inferior_registers (regno); } } error_exit: return; } /* Fetch one register. */ static void fetch_register (regno) int regno; { register unsigned int regaddr; char buf[MAX_REGISTER_RAW_SIZE]; char mess[128]; /* For messages */ register int i; /* Offset of registers within the u area. */ unsigned int offset; offset = U_REGS_OFFSET; regaddr = register_addr (regno, offset); for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) { errno = 0; *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0, 0); regaddr += sizeof (int); if (errno != 0) { /* Warning, not error, in case we are attached; sometimes the kernel doesn't let us at the registers. */ char *err = safe_strerror (errno); char *msg = alloca (strlen (err) + 128); sprintf (msg, "reading register %s: %s", reg_names[regno], err); warning (msg); goto error_exit; } } if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) buf[3] &= ~0x3; supply_register (regno, buf); error_exit:; } /* Copy LEN bytes to or from inferior's memory starting at MEMADDR to debugger memory starting at MYADDR. Copy to inferior if WRITE is nonzero. Returns the length copied, which is either the LEN argument or zero. This xfer function does not do partial moves, since child_ops doesn't allow memory operations to cross below us in the target stack anyway. */ int child_xfer_memory (memaddr, myaddr, len, write, target) CORE_ADDR memaddr; char *myaddr; int len; int write; struct target_ops *target; /* ignored */ { register int i; /* Round starting address down to longword boundary. */ register CORE_ADDR addr = memaddr & - sizeof (int); /* Round ending address up; get number of longwords that makes. */ register int count = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); /* Allocate buffer of that many longwords. */ register int *buffer = (int *) alloca (count * sizeof (int)); if (write) { /* Fill start and end extra bytes of buffer with existing memory data. */ if (addr != memaddr || len < (int)sizeof (int)) { /* Need part of initial word -- fetch it. */ buffer[0] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0); } if (count > 1) /* FIXME, avoid if even boundary */ { buffer[count - 1] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, inferior_pid, (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), 0, 0); } /* Copy data to be written over corresponding part of buffer */ memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); /* Write the entire buffer. */ for (i = 0; i < count; i++, addr += sizeof (int)) { /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text segment. FIXME -- does it work to write into the data segment using WIUSER, or do these idiots really expect us to figure out which segment the address is in, so we can use a separate system call for it??! */ errno = 0; ptrace (addr < text_end ? PT_WIUSER : PT_WDUSER, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i], 0); if (errno) return 0; } } else { /* Read all the longwords */ for (i = 0; i < count; i++, addr += sizeof (int)) { errno = 0; buffer[i] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0); if (errno) return 0; QUIT; } /* Copy appropriate bytes out of the buffer. */ memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); } return len; }