xtensa: implement NPTL helpers
These changes allow debugging multithreaded NPTL xtensa applications. 2015-08-20 Max Filippov <jcmvbkbc@gmail.com> gdb/gdbserver/ * configure.srv (xtensa*-*-linux*): Add srv_linux_thread_db=yes. * linux-xtensa-low.c (arch/xtensa.h gdb_proc_service.h): New #includes. (ps_get_thread_area): New function. 2015-08-20 Max Filippov <jcmvbkbc@gmail.com> gdb/ * arch/xtensa.h: New file. * xtensa-linux-nat.c (gdb_proc_service.h): New #include. (ps_get_thread_area): New function. * xtensa-linux-tdep.c (xtensa_linux_init_abi): Add call to set_gdbarch_fetch_tls_load_module_address to enable TLS support. * xtensa-tdep.c (osabi.h): New #include. (xtensa_gdbarch_init): Call gdbarch_init_osabi to register xtensa-specific hooks. * xtensa-tdep.h (struct xtensa_elf_gregset_t): Add threadptr member and move the structure to arch/xtensa.h.
This commit is contained in:
Max Filippov
parent
ab4e4ed5da
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40045d9181
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@ -1,3 +1,16 @@
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2015-08-20 Max Filippov <jcmvbkbc@gmail.com>
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* arch/xtensa.h: New file.
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* xtensa-linux-nat.c (gdb_proc_service.h): New #include.
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(ps_get_thread_area): New function.
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* xtensa-linux-tdep.c (xtensa_linux_init_abi): Add call to
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set_gdbarch_fetch_tls_load_module_address to enable TLS support.
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* xtensa-tdep.c (osabi.h): New #include.
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(xtensa_gdbarch_init): Call gdbarch_init_osabi to register
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xtensa-specific hooks.
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* xtensa-tdep.h (struct xtensa_elf_gregset_t): Add threadptr
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member and move the structure to arch/xtensa.h.
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2015-08-21 Pedro Alves <palves@redhat.com>
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* remote.c (struct readahead_cache): New.
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@ -0,0 +1,46 @@
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/* Common Target-dependent code for the Xtensa port of GDB, the GNU debugger.
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Copyright (C) 2003-2015 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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#ifndef XTENSA_H
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#define XTENSA_H
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/* Xtensa ELF core file register set representation ('.reg' section).
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Copied from target-side ELF header <xtensa/elf.h>. */
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typedef uint32_t xtensa_elf_greg_t;
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typedef struct
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{
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xtensa_elf_greg_t pc;
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xtensa_elf_greg_t ps;
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xtensa_elf_greg_t lbeg;
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xtensa_elf_greg_t lend;
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xtensa_elf_greg_t lcount;
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xtensa_elf_greg_t sar;
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xtensa_elf_greg_t windowstart;
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xtensa_elf_greg_t windowbase;
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xtensa_elf_greg_t threadptr;
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xtensa_elf_greg_t reserved[7+48];
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xtensa_elf_greg_t ar[64];
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} xtensa_elf_gregset_t;
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#define XTENSA_ELF_NGREG (sizeof (xtensa_elf_gregset_t) \
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/ sizeof (xtensa_elf_greg_t))
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#endif
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@ -1,3 +1,10 @@
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2015-08-20 Max Filippov <jcmvbkbc@gmail.com>
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* configure.srv (xtensa*-*-linux*): Add srv_linux_thread_db=yes.
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* linux-xtensa-low.c (arch/xtensa.h gdb_proc_service.h): New
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#includes.
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(ps_get_thread_area): New function.
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2015-08-19 Gary Benson <gbenson@redhat.com>
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* hostio.c (handle_pread): Do not attempt to read more data
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@ -352,6 +352,7 @@ case "${target}" in
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xtensa*-*-linux*) srv_regobj=reg-xtensa.o
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srv_tgtobj="$srv_linux_obj linux-xtensa-low.o"
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srv_linux_regsets=yes
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srv_linux_thread_db=yes
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;;
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tilegx-*-linux*) srv_regobj=reg-tilegx.o
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srv_regobj="${srv_regobj} reg-tilegx32.o"
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@ -26,6 +26,8 @@ extern const struct target_desc *tdesc_xtensa;
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#include <asm/ptrace.h>
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#include <xtensa-config.h>
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#include "arch/xtensa.h"
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#include "gdb_proc_service.h"
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#include "xtensa-xtregs.c"
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@ -179,6 +181,25 @@ xtensa_breakpoint_at (CORE_ADDR where)
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xtensa_breakpoint, xtensa_breakpoint_len) == 0;
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}
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/* Called by libthread_db. */
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ps_err_e
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ps_get_thread_area (const struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base)
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{
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xtensa_elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, lwpid, NULL, ®s) != 0)
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return PS_ERR;
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/* IDX is the bias from the thread pointer to the beginning of the
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thread descriptor. It has to be subtracted due to implementation
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quirks in libthread_db. */
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*base = (void *) ((char *) regs.threadptr - idx);
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return PS_OK;
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}
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static struct regsets_info xtensa_regsets_info =
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{
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xtensa_regsets, /* regsets */
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@ -37,6 +37,9 @@
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#include "gregset.h"
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#include "xtensa-tdep.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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/* Extended register set depends on hardware configs.
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Keeping these definitions separately allows to introduce
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hardware-specific overlays. */
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@ -280,6 +283,25 @@ xtensa_linux_store_inferior_registers (struct target_ops *ops,
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store_xtregs (regcache, regnum);
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}
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/* Called by libthread_db. */
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ps_err_e
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ps_get_thread_area (const struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base)
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{
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xtensa_elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, lwpid, NULL, ®s) != 0)
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return PS_ERR;
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/* IDX is the bias from the thread pointer to the beginning of the
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thread descriptor. It has to be subtracted due to implementation
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quirks in libthread_db. */
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*base = (void *) ((char *) regs.threadptr - idx);
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return PS_OK;
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}
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void _initialize_xtensa_linux_nat (void);
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void
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@ -106,6 +106,10 @@ xtensa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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xtensa_linux_gdb_signal_from_target);
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set_gdbarch_gdb_signal_to_target (gdbarch,
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xtensa_linux_gdb_signal_to_target);
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/* Enable TLS support. */
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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@ -28,6 +28,7 @@
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#include "value.h"
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#include "dis-asm.h"
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#include "inferior.h"
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#include "osabi.h"
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#include "floatformat.h"
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#include "regcache.h"
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#include "reggroups.h"
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@ -3273,6 +3274,9 @@ xtensa_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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/* Hook in the ABI-specific overrides, if they have been registered. */
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gdbarch_init_osabi (info, gdbarch);
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return gdbarch;
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}
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@ -18,6 +18,8 @@
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "arch/xtensa.h"
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/* XTENSA_TDEP_VERSION can/should be changed along with XTENSA_CONFIG_VERSION
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whenever the "tdep" structure changes in an incompatible way. */
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@ -81,28 +83,6 @@ typedef enum
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} xtensa_target_flags_t;
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/* Xtensa ELF core file register set representation ('.reg' section).
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Copied from target-side ELF header <xtensa/elf.h>. */
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typedef uint32_t xtensa_elf_greg_t;
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typedef struct
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{
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xtensa_elf_greg_t pc;
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xtensa_elf_greg_t ps;
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xtensa_elf_greg_t lbeg;
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xtensa_elf_greg_t lend;
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xtensa_elf_greg_t lcount;
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xtensa_elf_greg_t sar;
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xtensa_elf_greg_t windowstart;
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xtensa_elf_greg_t windowbase;
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xtensa_elf_greg_t reserved[8+48];
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xtensa_elf_greg_t ar[64];
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} xtensa_elf_gregset_t;
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#define XTENSA_ELF_NGREG (sizeof (xtensa_elf_gregset_t) \
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/ sizeof (xtensa_elf_greg_t))
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/* Mask. */
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typedef struct
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