| /* 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, 1994, 1995, 1998, |
| 1999, 2000, 2001 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 "regcache.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, PIDGET (inferior_ptid), \ |
| (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ |
| - KERNEL_U_ADDR |
| #endif |
| |
| /* Fetch one register. */ |
| |
| static void |
| fetch_register (int regno) |
| { |
| unsigned int regaddr; |
| char buf[MAX_REGISTER_SIZE]; |
| 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, PIDGET (inferior_ptid), |
| (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 (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 (int regno) |
| { |
| unsigned int regaddr; |
| char buf[80]; |
| 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 *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)] | 0x3; |
| ptrace (PT_WUREGS, PIDGET (inferior_ptid), (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, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) regaddr, |
| *(int *) &deprecated_registers[DEPRECATED_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 |
| has watchpoints inserted on heap or stack memory. */ |
| |
| #define PT_PROT 21 |
| |
| int |
| hppa_set_watchpoint (int addr, int len, int 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, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) pt_args, 0); |
| } |