mirror of
https://sourceware.org/git/binutils-gdb.git
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0d5ed15352
This change:
commit b775012e84
Author: Luis Machado <luisgpm@br.ibm.com>
Date: Fri Feb 24 15:10:59 2012 +0000
2012-02-24 Luis Machado <lgustavo@codesourcery.com>
* remote.c (remote_supports_cond_breakpoints): New forward
declaration.
[...]
changed the way breakpoints are inserted and removed such that
`insert_bp_location' can now be called with the breakpoint being handled
already in place, while previously the call was only ever made for
breakpoints that have not been put in place. This in turn caused an
issue for software breakpoints and targets for which a breakpoint's
`placed_address' may not be the same as the original requested address.
The issue is `insert_bp_location' overwrites the previously adjusted
value in `placed_address' with the original address, that is only
replaced back with the correct adjusted address later on when
`gdbarch_breakpoint_from_pc' is called. Meanwhile there's a window
where the value in `placed_address' does not correspond to data stored
in `shadow_contents', leading to incorrect instruction bytes being
supplied when `one_breakpoint_xfer_memory' is called to supply the
instruction overlaid by the breakpoint.
And this is exactly what happens on the MIPS target with software
breakpoints placed in microMIPS code. In this case not only
`placed_address' is not the original address because of the ISA bit, but
`mips_breakpoint_from_pc' has to read the original instruction to
determine which one of the two software breakpoint instruction encodings
to choose as well. The 16-bit encoding is used to replace 16-bit
instructions and similarly the 32-bit one is used with 32-bit
instructions, to satisfy branch delay slot size requirements.
The mismatch between `placed_address' and the address data in
`shadow_contents' has been obtained from leads to the wrong encoding
being used in some cases, which in the case of a 32-bit software
breakpoint instruction replacing a 16-bit instruction causes corruption
to the adjacent following instruction and leads the debug session astray
if execution reaches there e.g. with a jump.
To address this problem I made the change below, that adds a
`reqstd_address' field to `struct bp_target_info' and leaves
`placed_address' unchanged once it has been set. This ensures data in
`shadow_contents' is always consistent with `placed_address'.
This approach also has this good side effect that all the places that
examine the breakpoint's address see a consistent value, either
`reqstd_address' or `placed_address', as required. Currently some
places see either the original or the adjusted address in
`placed_address', depending on whether they have been called before
`gdbarch_remote_breakpoint_from_pc' or afterwards. This is in
particular true for subsequent calls to
`gdbarch_remote_breakpoint_from_pc' itself, e.g. from
`one_breakpoint_xfer_memory'. This is also important for places like
`find_single_step_breakpoint' where a breakpoint's address is compared
to the raw value of $pc.
* breakpoint.h (bp_target_info): Add `reqstd_address' member,
update comments.
* breakpoint.c (one_breakpoint_xfer_memory): Use `reqstd_address'
for the breakpoint's address. Don't preinitialize `placed_size'.
(insert_bp_location): Set `reqstd_address' rather than
`placed_address'.
(bp_target_info_copy_insertion_state): Also copy `placed_address'.
(bkpt_insert_location): Use `reqstd_address' for the breakpoint's
address.
(bkpt_remove_location): Likewise.
(deprecated_insert_raw_breakpoint): Likewise.
(deprecated_remove_raw_breakpoint): Likewise.
(find_single_step_breakpoint): Likewise.
* mem-break.c (default_memory_insert_breakpoint): Use
`reqstd_address' for the breakpoint's address. Don't set
`placed_address' or `placed_size' if breakpoint contents couldn't
have been determined.
* remote.c (remote_insert_breakpoint): Use `reqstd_address' for
the breakpoint's address.
(remote_insert_hw_breakpoint): Likewise. Don't set
`placed_address' or `placed_size' if breakpoint couldn't have been
set.
* aarch64-linux-nat.c (aarch64_linux_insert_hw_breakpoint): Use
`reqstd_address' for the breakpoint's address.
* arm-linux-nat.c (arm_linux_hw_breakpoint_initialize): Likewise.
* ia64-tdep.c (ia64_memory_insert_breakpoint): Likewise.
* m32r-tdep.c (m32r_memory_insert_breakpoint): Likewise.
* microblaze-linux-tdep.c
(microblaze_linux_memory_remove_breakpoint): Likewise.
* monitor.c (monitor_insert_breakpoint): Likewise.
* nto-procfs.c (procfs_insert_breakpoint): Likewise.
(procfs_insert_hw_breakpoint): Likewise.
* ppc-linux-nat.c (ppc_linux_insert_hw_breakpoint): Likewise.
* ppc-linux-tdep.c (ppc_linux_memory_remove_breakpoint): Likewise.
* remote-m32r-sdi.c (m32r_insert_breakpoint): Likewise.
* remote-mips.c (mips_insert_breakpoint): Likewise.
* x86-nat.c (x86_insert_hw_breakpoint): Likewise.
1442 lines
39 KiB
C
1442 lines
39 KiB
C
/* GNU/Linux on ARM native support.
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Copyright (C) 1999-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "target.h"
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#include "linux-nat.h"
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#include "target-descriptions.h"
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#include "auxv.h"
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#include "observer.h"
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#include "gdbthread.h"
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#include "arm-tdep.h"
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#include "arm-linux-tdep.h"
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#include <elf/common.h>
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#include <sys/user.h>
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#include <sys/ptrace.h>
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#include <sys/utsname.h>
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#include <sys/procfs.h>
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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/* Defines ps_err_e, struct ps_prochandle. */
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#include "gdb_proc_service.h"
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#ifndef PTRACE_GET_THREAD_AREA
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#define PTRACE_GET_THREAD_AREA 22
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#endif
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#ifndef PTRACE_GETWMMXREGS
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#define PTRACE_GETWMMXREGS 18
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#define PTRACE_SETWMMXREGS 19
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#endif
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#ifndef PTRACE_GETVFPREGS
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#define PTRACE_GETVFPREGS 27
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#define PTRACE_SETVFPREGS 28
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#endif
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#ifndef PTRACE_GETHBPREGS
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#define PTRACE_GETHBPREGS 29
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#define PTRACE_SETHBPREGS 30
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#endif
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/* A flag for whether the WMMX registers are available. */
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static int arm_linux_has_wmmx_registers;
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/* The number of 64-bit VFP registers we have (expect this to be 0,
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16, or 32). */
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static int arm_linux_vfp_register_count;
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extern int arm_apcs_32;
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/* On GNU/Linux, threads are implemented as pseudo-processes, in which
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case we may be tracing more than one process at a time. In that
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case, inferior_ptid will contain the main process ID and the
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individual thread (process) ID. get_thread_id () is used to get
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the thread id if it's available, and the process id otherwise. */
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static int
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get_thread_id (ptid_t ptid)
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{
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int tid = ptid_get_lwp (ptid);
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if (0 == tid)
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tid = ptid_get_pid (ptid);
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return tid;
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}
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#define GET_THREAD_ID(PTID) get_thread_id (PTID)
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/* Get the value of a particular register from the floating point
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state of the process and store it into regcache. */
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static void
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fetch_fpregister (struct regcache *regcache, int regno)
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{
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int ret, tid;
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gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Read the floating point state. */
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ret = ptrace (PT_GETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to fetch floating point register."));
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return;
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}
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/* Fetch fpsr. */
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if (ARM_FPS_REGNUM == regno)
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regcache_raw_supply (regcache, ARM_FPS_REGNUM,
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fp + NWFPE_FPSR_OFFSET);
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/* Fetch the floating point register. */
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if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
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supply_nwfpe_register (regcache, regno, fp);
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}
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/* Get the whole floating point state of the process and store it
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into regcache. */
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static void
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fetch_fpregs (struct regcache *regcache)
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{
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int ret, regno, tid;
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gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Read the floating point state. */
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ret = ptrace (PT_GETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to fetch the floating point registers."));
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return;
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}
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/* Fetch fpsr. */
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regcache_raw_supply (regcache, ARM_FPS_REGNUM,
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fp + NWFPE_FPSR_OFFSET);
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/* Fetch the floating point registers. */
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for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
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supply_nwfpe_register (regcache, regno, fp);
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}
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/* Save a particular register into the floating point state of the
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process using the contents from regcache. */
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static void
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store_fpregister (const struct regcache *regcache, int regno)
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{
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int ret, tid;
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gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Read the floating point state. */
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ret = ptrace (PT_GETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to fetch the floating point registers."));
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return;
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}
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/* Store fpsr. */
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if (ARM_FPS_REGNUM == regno
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&& REG_VALID == regcache_register_status (regcache, ARM_FPS_REGNUM))
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regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET);
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/* Store the floating point register. */
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if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
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collect_nwfpe_register (regcache, regno, fp);
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ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to store floating point register."));
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return;
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}
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}
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/* Save the whole floating point state of the process using
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the contents from regcache. */
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static void
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store_fpregs (const struct regcache *regcache)
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{
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int ret, regno, tid;
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gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Read the floating point state. */
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ret = ptrace (PT_GETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to fetch the floating point registers."));
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return;
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}
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/* Store fpsr. */
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if (REG_VALID == regcache_register_status (regcache, ARM_FPS_REGNUM))
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regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET);
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/* Store the floating point registers. */
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for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
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if (REG_VALID == regcache_register_status (regcache, regno))
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collect_nwfpe_register (regcache, regno, fp);
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ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to store floating point registers."));
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return;
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}
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}
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/* Fetch a general register of the process and store into
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regcache. */
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static void
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fetch_register (struct regcache *regcache, int regno)
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{
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int ret, tid;
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elf_gregset_t regs;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to fetch general register."));
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return;
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}
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if (regno >= ARM_A1_REGNUM && regno < ARM_PC_REGNUM)
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regcache_raw_supply (regcache, regno, (char *) ®s[regno]);
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if (ARM_PS_REGNUM == regno)
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{
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if (arm_apcs_32)
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regcache_raw_supply (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_CPSR_GREGNUM]);
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else
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regcache_raw_supply (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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}
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if (ARM_PC_REGNUM == regno)
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{
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regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove
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(get_regcache_arch (regcache),
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regs[ARM_PC_REGNUM]);
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regcache_raw_supply (regcache, ARM_PC_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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}
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}
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/* Fetch all general registers of the process and store into
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regcache. */
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static void
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fetch_regs (struct regcache *regcache)
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{
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int ret, regno, tid;
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elf_gregset_t regs;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to fetch general registers."));
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return;
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}
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for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
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regcache_raw_supply (regcache, regno, (char *) ®s[regno]);
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if (arm_apcs_32)
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regcache_raw_supply (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_CPSR_GREGNUM]);
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else
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regcache_raw_supply (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove
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(get_regcache_arch (regcache), regs[ARM_PC_REGNUM]);
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regcache_raw_supply (regcache, ARM_PC_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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}
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/* Store all general registers of the process from the values in
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regcache. */
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static void
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store_register (const struct regcache *regcache, int regno)
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{
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int ret, tid;
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elf_gregset_t regs;
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if (REG_VALID != regcache_register_status (regcache, regno))
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return;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Get the general registers from the process. */
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ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to fetch general registers."));
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return;
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}
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if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM)
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regcache_raw_collect (regcache, regno, (char *) ®s[regno]);
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else if (arm_apcs_32 && regno == ARM_PS_REGNUM)
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regcache_raw_collect (regcache, regno,
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(char *) ®s[ARM_CPSR_GREGNUM]);
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else if (!arm_apcs_32 && regno == ARM_PS_REGNUM)
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regcache_raw_collect (regcache, ARM_PC_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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ret = ptrace (PTRACE_SETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to store general register."));
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return;
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}
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}
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static void
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store_regs (const struct regcache *regcache)
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{
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int ret, regno, tid;
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elf_gregset_t regs;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Fetch the general registers. */
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ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to fetch general registers."));
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return;
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}
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for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++)
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{
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if (REG_VALID == regcache_register_status (regcache, regno))
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regcache_raw_collect (regcache, regno, (char *) ®s[regno]);
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}
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if (arm_apcs_32 && REG_VALID == regcache_register_status (regcache, ARM_PS_REGNUM))
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regcache_raw_collect (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_CPSR_GREGNUM]);
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ret = ptrace (PTRACE_SETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to store general registers."));
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return;
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}
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}
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/* Fetch all WMMX registers of the process and store into
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regcache. */
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#define IWMMXT_REGS_SIZE (16 * 8 + 6 * 4)
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static void
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fetch_wmmx_regs (struct regcache *regcache)
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{
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char regbuf[IWMMXT_REGS_SIZE];
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int ret, regno, tid;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
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if (ret < 0)
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{
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warning (_("Unable to fetch WMMX registers."));
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return;
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}
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for (regno = 0; regno < 16; regno++)
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regcache_raw_supply (regcache, regno + ARM_WR0_REGNUM,
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®buf[regno * 8]);
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for (regno = 0; regno < 2; regno++)
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regcache_raw_supply (regcache, regno + ARM_WCSSF_REGNUM,
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®buf[16 * 8 + regno * 4]);
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for (regno = 0; regno < 4; regno++)
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regcache_raw_supply (regcache, regno + ARM_WCGR0_REGNUM,
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®buf[16 * 8 + 2 * 4 + regno * 4]);
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}
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static void
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store_wmmx_regs (const struct regcache *regcache)
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{
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char regbuf[IWMMXT_REGS_SIZE];
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int ret, regno, tid;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
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if (ret < 0)
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{
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warning (_("Unable to fetch WMMX registers."));
|
|
return;
|
|
}
|
|
|
|
for (regno = 0; regno < 16; regno++)
|
|
if (REG_VALID == regcache_register_status (regcache,
|
|
regno + ARM_WR0_REGNUM))
|
|
regcache_raw_collect (regcache, regno + ARM_WR0_REGNUM,
|
|
®buf[regno * 8]);
|
|
|
|
for (regno = 0; regno < 2; regno++)
|
|
if (REG_VALID == regcache_register_status (regcache,
|
|
regno + ARM_WCSSF_REGNUM))
|
|
regcache_raw_collect (regcache, regno + ARM_WCSSF_REGNUM,
|
|
®buf[16 * 8 + regno * 4]);
|
|
|
|
for (regno = 0; regno < 4; regno++)
|
|
if (REG_VALID == regcache_register_status (regcache,
|
|
regno + ARM_WCGR0_REGNUM))
|
|
regcache_raw_collect (regcache, regno + ARM_WCGR0_REGNUM,
|
|
®buf[16 * 8 + 2 * 4 + regno * 4]);
|
|
|
|
ret = ptrace (PTRACE_SETWMMXREGS, tid, 0, regbuf);
|
|
|
|
if (ret < 0)
|
|
{
|
|
warning (_("Unable to store WMMX registers."));
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Fetch and store VFP Registers. The kernel object has space for 32
|
|
64-bit registers, and the FPSCR. This is even when on a VFPv2 or
|
|
VFPv3D16 target. */
|
|
#define VFP_REGS_SIZE (32 * 8 + 4)
|
|
|
|
static void
|
|
fetch_vfp_regs (struct regcache *regcache)
|
|
{
|
|
char regbuf[VFP_REGS_SIZE];
|
|
int ret, regno, tid;
|
|
|
|
/* Get the thread id for the ptrace call. */
|
|
tid = GET_THREAD_ID (inferior_ptid);
|
|
|
|
ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf);
|
|
if (ret < 0)
|
|
{
|
|
warning (_("Unable to fetch VFP registers."));
|
|
return;
|
|
}
|
|
|
|
for (regno = 0; regno < arm_linux_vfp_register_count; regno++)
|
|
regcache_raw_supply (regcache, regno + ARM_D0_REGNUM,
|
|
(char *) regbuf + regno * 8);
|
|
|
|
regcache_raw_supply (regcache, ARM_FPSCR_REGNUM,
|
|
(char *) regbuf + 32 * 8);
|
|
}
|
|
|
|
static void
|
|
store_vfp_regs (const struct regcache *regcache)
|
|
{
|
|
char regbuf[VFP_REGS_SIZE];
|
|
int ret, regno, tid;
|
|
|
|
/* Get the thread id for the ptrace call. */
|
|
tid = GET_THREAD_ID (inferior_ptid);
|
|
|
|
ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf);
|
|
if (ret < 0)
|
|
{
|
|
warning (_("Unable to fetch VFP registers (for update)."));
|
|
return;
|
|
}
|
|
|
|
for (regno = 0; regno < arm_linux_vfp_register_count; regno++)
|
|
regcache_raw_collect (regcache, regno + ARM_D0_REGNUM,
|
|
(char *) regbuf + regno * 8);
|
|
|
|
regcache_raw_collect (regcache, ARM_FPSCR_REGNUM,
|
|
(char *) regbuf + 32 * 8);
|
|
|
|
ret = ptrace (PTRACE_SETVFPREGS, tid, 0, regbuf);
|
|
|
|
if (ret < 0)
|
|
{
|
|
warning (_("Unable to store VFP registers."));
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Fetch registers from the child process. Fetch all registers if
|
|
regno == -1, otherwise fetch all general registers or all floating
|
|
point registers depending upon the value of regno. */
|
|
|
|
static void
|
|
arm_linux_fetch_inferior_registers (struct target_ops *ops,
|
|
struct regcache *regcache, int regno)
|
|
{
|
|
if (-1 == regno)
|
|
{
|
|
fetch_regs (regcache);
|
|
fetch_fpregs (regcache);
|
|
if (arm_linux_has_wmmx_registers)
|
|
fetch_wmmx_regs (regcache);
|
|
if (arm_linux_vfp_register_count > 0)
|
|
fetch_vfp_regs (regcache);
|
|
}
|
|
else
|
|
{
|
|
if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)
|
|
fetch_register (regcache, regno);
|
|
else if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM)
|
|
fetch_fpregister (regcache, regno);
|
|
else if (arm_linux_has_wmmx_registers
|
|
&& regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)
|
|
fetch_wmmx_regs (regcache);
|
|
else if (arm_linux_vfp_register_count > 0
|
|
&& regno >= ARM_D0_REGNUM
|
|
&& regno <= ARM_D0_REGNUM + arm_linux_vfp_register_count)
|
|
fetch_vfp_regs (regcache);
|
|
}
|
|
}
|
|
|
|
/* Store registers back into the inferior. Store all registers if
|
|
regno == -1, otherwise store all general registers or all floating
|
|
point registers depending upon the value of regno. */
|
|
|
|
static void
|
|
arm_linux_store_inferior_registers (struct target_ops *ops,
|
|
struct regcache *regcache, int regno)
|
|
{
|
|
if (-1 == regno)
|
|
{
|
|
store_regs (regcache);
|
|
store_fpregs (regcache);
|
|
if (arm_linux_has_wmmx_registers)
|
|
store_wmmx_regs (regcache);
|
|
if (arm_linux_vfp_register_count > 0)
|
|
store_vfp_regs (regcache);
|
|
}
|
|
else
|
|
{
|
|
if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)
|
|
store_register (regcache, regno);
|
|
else if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM))
|
|
store_fpregister (regcache, regno);
|
|
else if (arm_linux_has_wmmx_registers
|
|
&& regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)
|
|
store_wmmx_regs (regcache);
|
|
else if (arm_linux_vfp_register_count > 0
|
|
&& regno >= ARM_D0_REGNUM
|
|
&& regno <= ARM_D0_REGNUM + arm_linux_vfp_register_count)
|
|
store_vfp_regs (regcache);
|
|
}
|
|
}
|
|
|
|
/* Wrapper functions for the standard regset handling, used by
|
|
thread debugging. */
|
|
|
|
void
|
|
fill_gregset (const struct regcache *regcache,
|
|
gdb_gregset_t *gregsetp, int regno)
|
|
{
|
|
arm_linux_collect_gregset (NULL, regcache, regno, gregsetp, 0);
|
|
}
|
|
|
|
void
|
|
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
|
|
{
|
|
arm_linux_supply_gregset (NULL, regcache, -1, gregsetp, 0);
|
|
}
|
|
|
|
void
|
|
fill_fpregset (const struct regcache *regcache,
|
|
gdb_fpregset_t *fpregsetp, int regno)
|
|
{
|
|
arm_linux_collect_nwfpe (NULL, regcache, regno, fpregsetp, 0);
|
|
}
|
|
|
|
/* Fill GDB's register array with the floating-point register values
|
|
in *fpregsetp. */
|
|
|
|
void
|
|
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
|
|
{
|
|
arm_linux_supply_nwfpe (NULL, regcache, -1, fpregsetp, 0);
|
|
}
|
|
|
|
/* Fetch the thread-local storage pointer for libthread_db. */
|
|
|
|
ps_err_e
|
|
ps_get_thread_area (const struct ps_prochandle *ph,
|
|
lwpid_t lwpid, int idx, void **base)
|
|
{
|
|
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
|
|
return PS_ERR;
|
|
|
|
/* IDX is the bias from the thread pointer to the beginning of the
|
|
thread descriptor. It has to be subtracted due to implementation
|
|
quirks in libthread_db. */
|
|
*base = (void *) ((char *)*base - idx);
|
|
|
|
return PS_OK;
|
|
}
|
|
|
|
static const struct target_desc *
|
|
arm_linux_read_description (struct target_ops *ops)
|
|
{
|
|
CORE_ADDR arm_hwcap = 0;
|
|
arm_linux_has_wmmx_registers = 0;
|
|
arm_linux_vfp_register_count = 0;
|
|
|
|
if (target_auxv_search (ops, AT_HWCAP, &arm_hwcap) != 1)
|
|
{
|
|
return ops->beneath->to_read_description (ops->beneath);
|
|
}
|
|
|
|
if (arm_hwcap & HWCAP_IWMMXT)
|
|
{
|
|
arm_linux_has_wmmx_registers = 1;
|
|
return tdesc_arm_with_iwmmxt;
|
|
}
|
|
|
|
if (arm_hwcap & HWCAP_VFP)
|
|
{
|
|
int pid;
|
|
char *buf;
|
|
const struct target_desc * result = NULL;
|
|
|
|
/* NEON implies VFPv3-D32 or no-VFP unit. Say that we only support
|
|
Neon with VFPv3-D32. */
|
|
if (arm_hwcap & HWCAP_NEON)
|
|
{
|
|
arm_linux_vfp_register_count = 32;
|
|
result = tdesc_arm_with_neon;
|
|
}
|
|
else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
|
|
{
|
|
arm_linux_vfp_register_count = 32;
|
|
result = tdesc_arm_with_vfpv3;
|
|
}
|
|
else
|
|
{
|
|
arm_linux_vfp_register_count = 16;
|
|
result = tdesc_arm_with_vfpv2;
|
|
}
|
|
|
|
/* Now make sure that the kernel supports reading these
|
|
registers. Support was added in 2.6.30. */
|
|
pid = ptid_get_lwp (inferior_ptid);
|
|
errno = 0;
|
|
buf = alloca (VFP_REGS_SIZE);
|
|
if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0
|
|
&& errno == EIO)
|
|
result = NULL;
|
|
|
|
return result;
|
|
}
|
|
|
|
return ops->beneath->to_read_description (ops->beneath);
|
|
}
|
|
|
|
/* Information describing the hardware breakpoint capabilities. */
|
|
struct arm_linux_hwbp_cap
|
|
{
|
|
gdb_byte arch;
|
|
gdb_byte max_wp_length;
|
|
gdb_byte wp_count;
|
|
gdb_byte bp_count;
|
|
};
|
|
|
|
/* Since we cannot dynamically allocate subfields of arm_linux_process_info,
|
|
assume a maximum number of supported break-/watchpoints. */
|
|
#define MAX_BPTS 16
|
|
#define MAX_WPTS 16
|
|
|
|
/* Get hold of the Hardware Breakpoint information for the target we are
|
|
attached to. Returns NULL if the kernel doesn't support Hardware
|
|
breakpoints at all, or a pointer to the information structure. */
|
|
static const struct arm_linux_hwbp_cap *
|
|
arm_linux_get_hwbp_cap (void)
|
|
{
|
|
/* The info structure we return. */
|
|
static struct arm_linux_hwbp_cap info;
|
|
|
|
/* Is INFO in a good state? -1 means that no attempt has been made to
|
|
initialize INFO; 0 means an attempt has been made, but it failed; 1
|
|
means INFO is in an initialized state. */
|
|
static int available = -1;
|
|
|
|
if (available == -1)
|
|
{
|
|
int tid;
|
|
unsigned int val;
|
|
|
|
tid = GET_THREAD_ID (inferior_ptid);
|
|
if (ptrace (PTRACE_GETHBPREGS, tid, 0, &val) < 0)
|
|
available = 0;
|
|
else
|
|
{
|
|
info.arch = (gdb_byte)((val >> 24) & 0xff);
|
|
info.max_wp_length = (gdb_byte)((val >> 16) & 0xff);
|
|
info.wp_count = (gdb_byte)((val >> 8) & 0xff);
|
|
info.bp_count = (gdb_byte)(val & 0xff);
|
|
|
|
if (info.wp_count > MAX_WPTS)
|
|
{
|
|
warning (_("arm-linux-gdb supports %d hardware watchpoints but target \
|
|
supports %d"), MAX_WPTS, info.wp_count);
|
|
info.wp_count = MAX_WPTS;
|
|
}
|
|
|
|
if (info.bp_count > MAX_BPTS)
|
|
{
|
|
warning (_("arm-linux-gdb supports %d hardware breakpoints but target \
|
|
supports %d"), MAX_BPTS, info.bp_count);
|
|
info.bp_count = MAX_BPTS;
|
|
}
|
|
available = (info.arch != 0);
|
|
}
|
|
}
|
|
|
|
return available == 1 ? &info : NULL;
|
|
}
|
|
|
|
/* How many hardware breakpoints are available? */
|
|
static int
|
|
arm_linux_get_hw_breakpoint_count (void)
|
|
{
|
|
const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
|
|
return cap != NULL ? cap->bp_count : 0;
|
|
}
|
|
|
|
/* How many hardware watchpoints are available? */
|
|
static int
|
|
arm_linux_get_hw_watchpoint_count (void)
|
|
{
|
|
const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
|
|
return cap != NULL ? cap->wp_count : 0;
|
|
}
|
|
|
|
/* Have we got a free break-/watch-point available for use? Returns -1 if
|
|
there is not an appropriate resource available, otherwise returns 1. */
|
|
static int
|
|
arm_linux_can_use_hw_breakpoint (struct target_ops *self,
|
|
int type, int cnt, int ot)
|
|
{
|
|
if (type == bp_hardware_watchpoint || type == bp_read_watchpoint
|
|
|| type == bp_access_watchpoint || type == bp_watchpoint)
|
|
{
|
|
if (cnt + ot > arm_linux_get_hw_watchpoint_count ())
|
|
return -1;
|
|
}
|
|
else if (type == bp_hardware_breakpoint)
|
|
{
|
|
if (cnt > arm_linux_get_hw_breakpoint_count ())
|
|
return -1;
|
|
}
|
|
else
|
|
gdb_assert (FALSE);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Enum describing the different types of ARM hardware break-/watch-points. */
|
|
typedef enum
|
|
{
|
|
arm_hwbp_break = 0,
|
|
arm_hwbp_load = 1,
|
|
arm_hwbp_store = 2,
|
|
arm_hwbp_access = 3
|
|
} arm_hwbp_type;
|
|
|
|
/* Type describing an ARM Hardware Breakpoint Control register value. */
|
|
typedef unsigned int arm_hwbp_control_t;
|
|
|
|
/* Structure used to keep track of hardware break-/watch-points. */
|
|
struct arm_linux_hw_breakpoint
|
|
{
|
|
/* Address to break on, or being watched. */
|
|
unsigned int address;
|
|
/* Control register for break-/watch- point. */
|
|
arm_hwbp_control_t control;
|
|
};
|
|
|
|
/* Structure containing arrays of per process hardware break-/watchpoints
|
|
for caching address and control information.
|
|
|
|
The Linux ptrace interface to hardware break-/watch-points presents the
|
|
values in a vector centred around 0 (which is used fo generic information).
|
|
Positive indicies refer to breakpoint addresses/control registers, negative
|
|
indices to watchpoint addresses/control registers.
|
|
|
|
The Linux vector is indexed as follows:
|
|
-((i << 1) + 2): Control register for watchpoint i.
|
|
-((i << 1) + 1): Address register for watchpoint i.
|
|
0: Information register.
|
|
((i << 1) + 1): Address register for breakpoint i.
|
|
((i << 1) + 2): Control register for breakpoint i.
|
|
|
|
This structure is used as a per-thread cache of the state stored by the
|
|
kernel, so that we don't need to keep calling into the kernel to find a
|
|
free breakpoint.
|
|
|
|
We treat break-/watch-points with their enable bit clear as being deleted.
|
|
*/
|
|
struct arm_linux_debug_reg_state
|
|
{
|
|
/* Hardware breakpoints for this process. */
|
|
struct arm_linux_hw_breakpoint bpts[MAX_BPTS];
|
|
/* Hardware watchpoints for this process. */
|
|
struct arm_linux_hw_breakpoint wpts[MAX_WPTS];
|
|
};
|
|
|
|
/* Per-process arch-specific data we want to keep. */
|
|
struct arm_linux_process_info
|
|
{
|
|
/* Linked list. */
|
|
struct arm_linux_process_info *next;
|
|
/* The process identifier. */
|
|
pid_t pid;
|
|
/* Hardware break-/watchpoints state information. */
|
|
struct arm_linux_debug_reg_state state;
|
|
|
|
};
|
|
|
|
/* Per-thread arch-specific data we want to keep. */
|
|
struct arch_lwp_info
|
|
{
|
|
/* Non-zero if our copy differs from what's recorded in the thread. */
|
|
char bpts_changed[MAX_BPTS];
|
|
char wpts_changed[MAX_WPTS];
|
|
};
|
|
|
|
static struct arm_linux_process_info *arm_linux_process_list = NULL;
|
|
|
|
/* Find process data for process PID. */
|
|
|
|
static struct arm_linux_process_info *
|
|
arm_linux_find_process_pid (pid_t pid)
|
|
{
|
|
struct arm_linux_process_info *proc;
|
|
|
|
for (proc = arm_linux_process_list; proc; proc = proc->next)
|
|
if (proc->pid == pid)
|
|
return proc;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Add process data for process PID. Returns newly allocated info
|
|
object. */
|
|
|
|
static struct arm_linux_process_info *
|
|
arm_linux_add_process (pid_t pid)
|
|
{
|
|
struct arm_linux_process_info *proc;
|
|
|
|
proc = xcalloc (1, sizeof (*proc));
|
|
proc->pid = pid;
|
|
|
|
proc->next = arm_linux_process_list;
|
|
arm_linux_process_list = proc;
|
|
|
|
return proc;
|
|
}
|
|
|
|
/* Get data specific info for process PID, creating it if necessary.
|
|
Never returns NULL. */
|
|
|
|
static struct arm_linux_process_info *
|
|
arm_linux_process_info_get (pid_t pid)
|
|
{
|
|
struct arm_linux_process_info *proc;
|
|
|
|
proc = arm_linux_find_process_pid (pid);
|
|
if (proc == NULL)
|
|
proc = arm_linux_add_process (pid);
|
|
|
|
return proc;
|
|
}
|
|
|
|
/* Called whenever GDB is no longer debugging process PID. It deletes
|
|
data structures that keep track of debug register state. */
|
|
|
|
static void
|
|
arm_linux_forget_process (pid_t pid)
|
|
{
|
|
struct arm_linux_process_info *proc, **proc_link;
|
|
|
|
proc = arm_linux_process_list;
|
|
proc_link = &arm_linux_process_list;
|
|
|
|
while (proc != NULL)
|
|
{
|
|
if (proc->pid == pid)
|
|
{
|
|
*proc_link = proc->next;
|
|
|
|
xfree (proc);
|
|
return;
|
|
}
|
|
|
|
proc_link = &proc->next;
|
|
proc = *proc_link;
|
|
}
|
|
}
|
|
|
|
/* Get hardware break-/watchpoint state for process PID. */
|
|
|
|
static struct arm_linux_debug_reg_state *
|
|
arm_linux_get_debug_reg_state (pid_t pid)
|
|
{
|
|
return &arm_linux_process_info_get (pid)->state;
|
|
}
|
|
|
|
/* Initialize an ARM hardware break-/watch-point control register value.
|
|
BYTE_ADDRESS_SELECT is the mask of bytes to trigger on; HWBP_TYPE is the
|
|
type of break-/watch-point; ENABLE indicates whether the point is enabled.
|
|
*/
|
|
static arm_hwbp_control_t
|
|
arm_hwbp_control_initialize (unsigned byte_address_select,
|
|
arm_hwbp_type hwbp_type,
|
|
int enable)
|
|
{
|
|
gdb_assert ((byte_address_select & ~0xffU) == 0);
|
|
gdb_assert (hwbp_type != arm_hwbp_break
|
|
|| ((byte_address_select & 0xfU) != 0));
|
|
|
|
return (byte_address_select << 5) | (hwbp_type << 3) | (3 << 1) | enable;
|
|
}
|
|
|
|
/* Does the breakpoint control value CONTROL have the enable bit set? */
|
|
static int
|
|
arm_hwbp_control_is_enabled (arm_hwbp_control_t control)
|
|
{
|
|
return control & 0x1;
|
|
}
|
|
|
|
/* Change a breakpoint control word so that it is in the disabled state. */
|
|
static arm_hwbp_control_t
|
|
arm_hwbp_control_disable (arm_hwbp_control_t control)
|
|
{
|
|
return control & ~0x1;
|
|
}
|
|
|
|
/* Initialise the hardware breakpoint structure P. The breakpoint will be
|
|
enabled, and will point to the placed address of BP_TGT. */
|
|
static void
|
|
arm_linux_hw_breakpoint_initialize (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt,
|
|
struct arm_linux_hw_breakpoint *p)
|
|
{
|
|
unsigned mask;
|
|
CORE_ADDR address = bp_tgt->placed_address = bp_tgt->reqstd_address;
|
|
|
|
/* We have to create a mask for the control register which says which bits
|
|
of the word pointed to by address to break on. */
|
|
if (arm_pc_is_thumb (gdbarch, address))
|
|
{
|
|
mask = 0x3;
|
|
address &= ~1;
|
|
}
|
|
else
|
|
{
|
|
mask = 0xf;
|
|
address &= ~3;
|
|
}
|
|
|
|
p->address = (unsigned int) address;
|
|
p->control = arm_hwbp_control_initialize (mask, arm_hwbp_break, 1);
|
|
}
|
|
|
|
/* Get the ARM hardware breakpoint type from the RW value we're given when
|
|
asked to set a watchpoint. */
|
|
static arm_hwbp_type
|
|
arm_linux_get_hwbp_type (int rw)
|
|
{
|
|
if (rw == hw_read)
|
|
return arm_hwbp_load;
|
|
else if (rw == hw_write)
|
|
return arm_hwbp_store;
|
|
else
|
|
return arm_hwbp_access;
|
|
}
|
|
|
|
/* Initialize the hardware breakpoint structure P for a watchpoint at ADDR
|
|
to LEN. The type of watchpoint is given in RW. */
|
|
static void
|
|
arm_linux_hw_watchpoint_initialize (CORE_ADDR addr, int len, int rw,
|
|
struct arm_linux_hw_breakpoint *p)
|
|
{
|
|
const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
|
|
unsigned mask;
|
|
|
|
gdb_assert (cap != NULL);
|
|
gdb_assert (cap->max_wp_length != 0);
|
|
|
|
mask = (1 << len) - 1;
|
|
|
|
p->address = (unsigned int) addr;
|
|
p->control = arm_hwbp_control_initialize (mask,
|
|
arm_linux_get_hwbp_type (rw), 1);
|
|
}
|
|
|
|
/* Are two break-/watch-points equal? */
|
|
static int
|
|
arm_linux_hw_breakpoint_equal (const struct arm_linux_hw_breakpoint *p1,
|
|
const struct arm_linux_hw_breakpoint *p2)
|
|
{
|
|
return p1->address == p2->address && p1->control == p2->control;
|
|
}
|
|
|
|
/* Callback to mark a watch-/breakpoint to be updated in all threads of
|
|
the current process. */
|
|
|
|
struct update_registers_data
|
|
{
|
|
int watch;
|
|
int index;
|
|
};
|
|
|
|
static int
|
|
update_registers_callback (struct lwp_info *lwp, void *arg)
|
|
{
|
|
struct update_registers_data *data = (struct update_registers_data *) arg;
|
|
|
|
if (lwp->arch_private == NULL)
|
|
lwp->arch_private = XCNEW (struct arch_lwp_info);
|
|
|
|
/* The actual update is done later just before resuming the lwp,
|
|
we just mark that the registers need updating. */
|
|
if (data->watch)
|
|
lwp->arch_private->wpts_changed[data->index] = 1;
|
|
else
|
|
lwp->arch_private->bpts_changed[data->index] = 1;
|
|
|
|
/* If the lwp isn't stopped, force it to momentarily pause, so
|
|
we can update its breakpoint registers. */
|
|
if (!lwp->stopped)
|
|
linux_stop_lwp (lwp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Insert the hardware breakpoint (WATCHPOINT = 0) or watchpoint (WATCHPOINT
|
|
=1) BPT for thread TID. */
|
|
static void
|
|
arm_linux_insert_hw_breakpoint1 (const struct arm_linux_hw_breakpoint* bpt,
|
|
int watchpoint)
|
|
{
|
|
int pid;
|
|
ptid_t pid_ptid;
|
|
gdb_byte count, i;
|
|
struct arm_linux_hw_breakpoint* bpts;
|
|
struct update_registers_data data;
|
|
|
|
pid = ptid_get_pid (inferior_ptid);
|
|
pid_ptid = pid_to_ptid (pid);
|
|
|
|
if (watchpoint)
|
|
{
|
|
count = arm_linux_get_hw_watchpoint_count ();
|
|
bpts = arm_linux_get_debug_reg_state (pid)->wpts;
|
|
}
|
|
else
|
|
{
|
|
count = arm_linux_get_hw_breakpoint_count ();
|
|
bpts = arm_linux_get_debug_reg_state (pid)->bpts;
|
|
}
|
|
|
|
for (i = 0; i < count; ++i)
|
|
if (!arm_hwbp_control_is_enabled (bpts[i].control))
|
|
{
|
|
data.watch = watchpoint;
|
|
data.index = i;
|
|
bpts[i] = *bpt;
|
|
iterate_over_lwps (pid_ptid, update_registers_callback, &data);
|
|
break;
|
|
}
|
|
|
|
gdb_assert (i != count);
|
|
}
|
|
|
|
/* Remove the hardware breakpoint (WATCHPOINT = 0) or watchpoint
|
|
(WATCHPOINT = 1) BPT for thread TID. */
|
|
static void
|
|
arm_linux_remove_hw_breakpoint1 (const struct arm_linux_hw_breakpoint *bpt,
|
|
int watchpoint)
|
|
{
|
|
int pid;
|
|
gdb_byte count, i;
|
|
ptid_t pid_ptid;
|
|
struct arm_linux_hw_breakpoint* bpts;
|
|
struct update_registers_data data;
|
|
|
|
pid = ptid_get_pid (inferior_ptid);
|
|
pid_ptid = pid_to_ptid (pid);
|
|
|
|
if (watchpoint)
|
|
{
|
|
count = arm_linux_get_hw_watchpoint_count ();
|
|
bpts = arm_linux_get_debug_reg_state (pid)->wpts;
|
|
}
|
|
else
|
|
{
|
|
count = arm_linux_get_hw_breakpoint_count ();
|
|
bpts = arm_linux_get_debug_reg_state (pid)->bpts;
|
|
}
|
|
|
|
for (i = 0; i < count; ++i)
|
|
if (arm_linux_hw_breakpoint_equal (bpt, bpts + i))
|
|
{
|
|
data.watch = watchpoint;
|
|
data.index = i;
|
|
bpts[i].control = arm_hwbp_control_disable (bpts[i].control);
|
|
iterate_over_lwps (pid_ptid, update_registers_callback, &data);
|
|
break;
|
|
}
|
|
|
|
gdb_assert (i != count);
|
|
}
|
|
|
|
/* Insert a Hardware breakpoint. */
|
|
static int
|
|
arm_linux_insert_hw_breakpoint (struct target_ops *self,
|
|
struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt)
|
|
{
|
|
struct lwp_info *lp;
|
|
struct arm_linux_hw_breakpoint p;
|
|
|
|
if (arm_linux_get_hw_breakpoint_count () == 0)
|
|
return -1;
|
|
|
|
arm_linux_hw_breakpoint_initialize (gdbarch, bp_tgt, &p);
|
|
|
|
arm_linux_insert_hw_breakpoint1 (&p, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Remove a hardware breakpoint. */
|
|
static int
|
|
arm_linux_remove_hw_breakpoint (struct target_ops *self,
|
|
struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt)
|
|
{
|
|
struct lwp_info *lp;
|
|
struct arm_linux_hw_breakpoint p;
|
|
|
|
if (arm_linux_get_hw_breakpoint_count () == 0)
|
|
return -1;
|
|
|
|
arm_linux_hw_breakpoint_initialize (gdbarch, bp_tgt, &p);
|
|
|
|
arm_linux_remove_hw_breakpoint1 (&p, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Are we able to use a hardware watchpoint for the LEN bytes starting at
|
|
ADDR? */
|
|
static int
|
|
arm_linux_region_ok_for_hw_watchpoint (struct target_ops *self,
|
|
CORE_ADDR addr, int len)
|
|
{
|
|
const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
|
|
CORE_ADDR max_wp_length, aligned_addr;
|
|
|
|
/* Can not set watchpoints for zero or negative lengths. */
|
|
if (len <= 0)
|
|
return 0;
|
|
|
|
/* Need to be able to use the ptrace interface. */
|
|
if (cap == NULL || cap->wp_count == 0)
|
|
return 0;
|
|
|
|
/* Test that the range [ADDR, ADDR + LEN) fits into the largest address
|
|
range covered by a watchpoint. */
|
|
max_wp_length = (CORE_ADDR)cap->max_wp_length;
|
|
aligned_addr = addr & ~(max_wp_length - 1);
|
|
|
|
if (aligned_addr + max_wp_length < addr + len)
|
|
return 0;
|
|
|
|
/* The current ptrace interface can only handle watchpoints that are a
|
|
power of 2. */
|
|
if ((len & (len - 1)) != 0)
|
|
return 0;
|
|
|
|
/* All tests passed so we must be able to set a watchpoint. */
|
|
return 1;
|
|
}
|
|
|
|
/* Insert a Hardware breakpoint. */
|
|
static int
|
|
arm_linux_insert_watchpoint (struct target_ops *self,
|
|
CORE_ADDR addr, int len, int rw,
|
|
struct expression *cond)
|
|
{
|
|
struct lwp_info *lp;
|
|
struct arm_linux_hw_breakpoint p;
|
|
|
|
if (arm_linux_get_hw_watchpoint_count () == 0)
|
|
return -1;
|
|
|
|
arm_linux_hw_watchpoint_initialize (addr, len, rw, &p);
|
|
|
|
arm_linux_insert_hw_breakpoint1 (&p, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Remove a hardware breakpoint. */
|
|
static int
|
|
arm_linux_remove_watchpoint (struct target_ops *self,
|
|
CORE_ADDR addr, int len, int rw,
|
|
struct expression *cond)
|
|
{
|
|
struct lwp_info *lp;
|
|
struct arm_linux_hw_breakpoint p;
|
|
|
|
if (arm_linux_get_hw_watchpoint_count () == 0)
|
|
return -1;
|
|
|
|
arm_linux_hw_watchpoint_initialize (addr, len, rw, &p);
|
|
|
|
arm_linux_remove_hw_breakpoint1 (&p, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* What was the data address the target was stopped on accessing. */
|
|
static int
|
|
arm_linux_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p)
|
|
{
|
|
siginfo_t siginfo;
|
|
int slot;
|
|
|
|
if (!linux_nat_get_siginfo (inferior_ptid, &siginfo))
|
|
return 0;
|
|
|
|
/* This must be a hardware breakpoint. */
|
|
if (siginfo.si_signo != SIGTRAP
|
|
|| (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */)
|
|
return 0;
|
|
|
|
/* We must be able to set hardware watchpoints. */
|
|
if (arm_linux_get_hw_watchpoint_count () == 0)
|
|
return 0;
|
|
|
|
slot = siginfo.si_errno;
|
|
|
|
/* If we are in a positive slot then we're looking at a breakpoint and not
|
|
a watchpoint. */
|
|
if (slot >= 0)
|
|
return 0;
|
|
|
|
*addr_p = (CORE_ADDR) (uintptr_t) siginfo.si_addr;
|
|
return 1;
|
|
}
|
|
|
|
/* Has the target been stopped by hitting a watchpoint? */
|
|
static int
|
|
arm_linux_stopped_by_watchpoint (struct target_ops *ops)
|
|
{
|
|
CORE_ADDR addr;
|
|
return arm_linux_stopped_data_address (ops, &addr);
|
|
}
|
|
|
|
static int
|
|
arm_linux_watchpoint_addr_within_range (struct target_ops *target,
|
|
CORE_ADDR addr,
|
|
CORE_ADDR start, int length)
|
|
{
|
|
return start <= addr && start + length - 1 >= addr;
|
|
}
|
|
|
|
/* Handle thread creation. We need to copy the breakpoints and watchpoints
|
|
in the parent thread to the child thread. */
|
|
static void
|
|
arm_linux_new_thread (struct lwp_info *lp)
|
|
{
|
|
int i;
|
|
struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
|
|
|
|
/* Mark that all the hardware breakpoint/watchpoint register pairs
|
|
for this thread need to be initialized. */
|
|
|
|
for (i = 0; i < MAX_BPTS; i++)
|
|
{
|
|
info->bpts_changed[i] = 1;
|
|
info->wpts_changed[i] = 1;
|
|
}
|
|
|
|
lp->arch_private = info;
|
|
}
|
|
|
|
/* Called when resuming a thread.
|
|
The hardware debug registers are updated when there is any change. */
|
|
|
|
static void
|
|
arm_linux_prepare_to_resume (struct lwp_info *lwp)
|
|
{
|
|
int pid, i;
|
|
struct arm_linux_hw_breakpoint *bpts, *wpts;
|
|
struct arch_lwp_info *arm_lwp_info = lwp->arch_private;
|
|
|
|
pid = ptid_get_lwp (lwp->ptid);
|
|
bpts = arm_linux_get_debug_reg_state (ptid_get_pid (lwp->ptid))->bpts;
|
|
wpts = arm_linux_get_debug_reg_state (ptid_get_pid (lwp->ptid))->wpts;
|
|
|
|
/* NULL means this is the main thread still going through the shell,
|
|
or, no watchpoint has been set yet. In that case, there's
|
|
nothing to do. */
|
|
if (arm_lwp_info == NULL)
|
|
return;
|
|
|
|
for (i = 0; i < arm_linux_get_hw_breakpoint_count (); i++)
|
|
if (arm_lwp_info->bpts_changed[i])
|
|
{
|
|
errno = 0;
|
|
if (arm_hwbp_control_is_enabled (bpts[i].control))
|
|
if (ptrace (PTRACE_SETHBPREGS, pid,
|
|
(PTRACE_TYPE_ARG3) ((i << 1) + 1), &bpts[i].address) < 0)
|
|
perror_with_name (_("Unexpected error setting breakpoint"));
|
|
|
|
if (bpts[i].control != 0)
|
|
if (ptrace (PTRACE_SETHBPREGS, pid,
|
|
(PTRACE_TYPE_ARG3) ((i << 1) + 2), &bpts[i].control) < 0)
|
|
perror_with_name (_("Unexpected error setting breakpoint"));
|
|
|
|
arm_lwp_info->bpts_changed[i] = 0;
|
|
}
|
|
|
|
for (i = 0; i < arm_linux_get_hw_watchpoint_count (); i++)
|
|
if (arm_lwp_info->wpts_changed[i])
|
|
{
|
|
errno = 0;
|
|
if (arm_hwbp_control_is_enabled (wpts[i].control))
|
|
if (ptrace (PTRACE_SETHBPREGS, pid,
|
|
(PTRACE_TYPE_ARG3) -((i << 1) + 1), &wpts[i].address) < 0)
|
|
perror_with_name (_("Unexpected error setting watchpoint"));
|
|
|
|
if (wpts[i].control != 0)
|
|
if (ptrace (PTRACE_SETHBPREGS, pid,
|
|
(PTRACE_TYPE_ARG3) -((i << 1) + 2), &wpts[i].control) < 0)
|
|
perror_with_name (_("Unexpected error setting watchpoint"));
|
|
|
|
arm_lwp_info->wpts_changed[i] = 0;
|
|
}
|
|
}
|
|
|
|
/* linux_nat_new_fork hook. */
|
|
|
|
static void
|
|
arm_linux_new_fork (struct lwp_info *parent, pid_t child_pid)
|
|
{
|
|
pid_t parent_pid;
|
|
struct arm_linux_debug_reg_state *parent_state;
|
|
struct arm_linux_debug_reg_state *child_state;
|
|
|
|
/* NULL means no watchpoint has ever been set in the parent. In
|
|
that case, there's nothing to do. */
|
|
if (parent->arch_private == NULL)
|
|
return;
|
|
|
|
/* GDB core assumes the child inherits the watchpoints/hw
|
|
breakpoints of the parent, and will remove them all from the
|
|
forked off process. Copy the debug registers mirrors into the
|
|
new process so that all breakpoints and watchpoints can be
|
|
removed together. */
|
|
|
|
parent_pid = ptid_get_pid (parent->ptid);
|
|
parent_state = arm_linux_get_debug_reg_state (parent_pid);
|
|
child_state = arm_linux_get_debug_reg_state (child_pid);
|
|
*child_state = *parent_state;
|
|
}
|
|
|
|
void _initialize_arm_linux_nat (void);
|
|
|
|
void
|
|
_initialize_arm_linux_nat (void)
|
|
{
|
|
struct target_ops *t;
|
|
|
|
/* Fill in the generic GNU/Linux methods. */
|
|
t = linux_target ();
|
|
|
|
/* Add our register access methods. */
|
|
t->to_fetch_registers = arm_linux_fetch_inferior_registers;
|
|
t->to_store_registers = arm_linux_store_inferior_registers;
|
|
|
|
/* Add our hardware breakpoint and watchpoint implementation. */
|
|
t->to_can_use_hw_breakpoint = arm_linux_can_use_hw_breakpoint;
|
|
t->to_insert_hw_breakpoint = arm_linux_insert_hw_breakpoint;
|
|
t->to_remove_hw_breakpoint = arm_linux_remove_hw_breakpoint;
|
|
t->to_region_ok_for_hw_watchpoint = arm_linux_region_ok_for_hw_watchpoint;
|
|
t->to_insert_watchpoint = arm_linux_insert_watchpoint;
|
|
t->to_remove_watchpoint = arm_linux_remove_watchpoint;
|
|
t->to_stopped_by_watchpoint = arm_linux_stopped_by_watchpoint;
|
|
t->to_stopped_data_address = arm_linux_stopped_data_address;
|
|
t->to_watchpoint_addr_within_range = arm_linux_watchpoint_addr_within_range;
|
|
|
|
t->to_read_description = arm_linux_read_description;
|
|
|
|
/* Register the target. */
|
|
linux_nat_add_target (t);
|
|
|
|
/* Handle thread creation and exit. */
|
|
linux_nat_set_new_thread (t, arm_linux_new_thread);
|
|
linux_nat_set_prepare_to_resume (t, arm_linux_prepare_to_resume);
|
|
|
|
/* Handle process creation and exit. */
|
|
linux_nat_set_new_fork (t, arm_linux_new_fork);
|
|
linux_nat_set_forget_process (t, arm_linux_forget_process);
|
|
}
|