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Diffstat (limited to 'gnu/usr.bin/binutils/gdb/hppaobsd-nat.c')
-rw-r--r--gnu/usr.bin/binutils/gdb/hppaobsd-nat.c215
1 files changed, 215 insertions, 0 deletions
diff --git a/gnu/usr.bin/binutils/gdb/hppaobsd-nat.c b/gnu/usr.bin/binutils/gdb/hppaobsd-nat.c
new file mode 100644
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+++ b/gnu/usr.bin/binutils/gdb/hppaobsd-nat.c
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+/* 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", reg_names[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 *) &registers[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 *) &registers[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",
+ reg_names[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);
+}
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