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Diffstat (limited to 'gdb/hppab-nat.c')
| -rw-r--r-- | gdb/hppab-nat.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/gdb/hppab-nat.c b/gdb/hppab-nat.c new file mode 100644 index 0000000..52ce1fd --- /dev/null +++ b/gdb/hppab-nat.c @@ -0,0 +1,215 @@ +/* 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); +} |