/* Machine-dependent hooks for the unix child process stratum. This code is for the HP PA-RISC cpu. 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "inferior.h" #include "target.h" #include <sys/ptrace.h> /* Use an extra level of indirection for ptrace calls. This lets us breakpoint usefully on call_ptrace. It also allows us to pass an extra argument to ptrace without using an ANSI-C specific macro. */ #define ptrace call_ptrace #if !defined (offsetof) #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) #endif /* U_REGS_OFFSET is the offset of the registers within the u area. */ #if !defined (U_REGS_OFFSET) #define U_REGS_OFFSET \ ptrace (PT_READ_U, inferior_pid, \ (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ - KERNEL_U_ADDR #endif /* Fetch one register. */ static void fetch_register (regno) int regno; { register unsigned int regaddr; char buf[MAX_REGISTER_RAW_SIZE]; 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); 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", REGISTER_NAME (regno), err); warning (msg); goto error_exit; } } supply_register (regno, buf); error_exit:; } /* Fetch all registers, or just one, from the child process. */ 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) { if (CANNOT_STORE_REGISTER (regno)) return; 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); 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]); 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", REGISTER_NAME (regno), err); warning (msg); return; } regaddr += sizeof(int); } } else for (regno = 0; regno < NUM_REGS; regno++) store_inferior_registers (regno); } /* PT_PROT is specific to the PA BSD kernel and isn't documented anywhere (except here). PT_PROT allows one to enable/disable the data memory break bit for pages of memory in an inferior process. This bit is used to cause "Data memory break traps" to occur when the appropriate page is written to. The arguments are as follows: PT_PROT -- The ptrace action to perform. INFERIOR_PID -- The pid of the process who's page table entries will be modified. PT_ARGS -- The *address* of a 3 word block of memory which has additional information: word 0 -- The start address to watch. This should be a page-aligned address. word 1 -- The ending address to watch. Again, this should be a page aligned address. word 2 -- Nonzero to enable the data memory break bit on the given address range or zero to disable the data memory break bit on the given address range. This call may fail if the given addresses are not valid in the inferior process. This most often happens when restarting a program which as watchpoints inserted on heap or stack memory. */ #define PT_PROT 21 int hppa_set_watchpoint (addr, len, flag) int addr, len, flag; { int pt_args[3]; pt_args[0] = addr; pt_args[1] = addr + len; pt_args[2] = flag; /* Mask off the lower 12 bits since we want to work on a page basis. */ pt_args[0] >>= 12; pt_args[1] >>= 12; /* Rounding adjustments. */ pt_args[1] -= pt_args[0]; pt_args[1]++; /* Put the lower 12 bits back as zero. */ pt_args[0] <<= 12; pt_args[1] <<= 12; /* Do it. */ return ptrace (PT_PROT, inferior_pid, (PTRACE_ARG3_TYPE) pt_args, 0); }