mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-06 00:34:26 +08:00
4de283e4b5
Andreas Schwab and John Baldwin pointed out some bugs in the header sorting patch; and I noticed that the output was not correct when limited to a subset of files (a bug in my script). So, I'm reverting the patch. I may try again after fixing the issues pointed out. gdb/ChangeLog 2019-04-05 Tom Tromey <tom@tromey.com> Revert the header-sorting patch. * ft32-tdep.c: Revert. * frv-tdep.c: Revert. * frv-linux-tdep.c: Revert. * frame.c: Revert. * frame-unwind.c: Revert. * frame-base.c: Revert. * fork-child.c: Revert. * findvar.c: Revert. * findcmd.c: Revert. * filesystem.c: Revert. * filename-seen-cache.h: Revert. * filename-seen-cache.c: Revert. * fbsd-tdep.c: Revert. * fbsd-nat.h: Revert. * fbsd-nat.c: Revert. * f-valprint.c: Revert. * f-typeprint.c: Revert. * f-lang.c: Revert. * extension.h: Revert. * extension.c: Revert. * extension-priv.h: Revert. * expprint.c: Revert. * exec.h: Revert. * exec.c: Revert. * exceptions.c: Revert. * event-top.c: Revert. * event-loop.c: Revert. * eval.c: Revert. * elfread.c: Revert. * dwarf2read.h: Revert. * dwarf2read.c: Revert. * dwarf2loc.c: Revert. * dwarf2expr.h: Revert. * dwarf2expr.c: Revert. * dwarf2-frame.c: Revert. * dwarf2-frame-tailcall.c: Revert. * dwarf-index-write.h: Revert. * dwarf-index-write.c: Revert. * dwarf-index-common.c: Revert. * dwarf-index-cache.h: Revert. * dwarf-index-cache.c: Revert. * dummy-frame.c: Revert. * dtrace-probe.c: Revert. * disasm.h: Revert. * disasm.c: Revert. * disasm-selftests.c: Revert. * dictionary.c: Revert. * dicos-tdep.c: Revert. * demangle.c: Revert. * dcache.h: Revert. * dcache.c: Revert. * darwin-nat.h: Revert. * darwin-nat.c: Revert. * darwin-nat-info.c: Revert. * d-valprint.c: Revert. * d-namespace.c: Revert. * d-lang.c: Revert. * ctf.c: Revert. * csky-tdep.c: Revert. * csky-linux-tdep.c: Revert. * cris-tdep.c: Revert. * cris-linux-tdep.c: Revert. * cp-valprint.c: Revert. * cp-support.c: Revert. * cp-namespace.c: Revert. * cp-abi.c: Revert. * corelow.c: Revert. * corefile.c: Revert. * continuations.c: Revert. * completer.h: Revert. * completer.c: Revert. * complaints.c: Revert. * coffread.c: Revert. * coff-pe-read.c: Revert. * cli-out.h: Revert. * cli-out.c: Revert. * charset.c: Revert. * c-varobj.c: Revert. * c-valprint.c: Revert. * c-typeprint.c: Revert. * c-lang.c: Revert. * buildsym.c: Revert. * buildsym-legacy.c: Revert. * build-id.h: Revert. * build-id.c: Revert. * btrace.c: Revert. * bsd-uthread.c: Revert. * breakpoint.h: Revert. * breakpoint.c: Revert. * break-catch-throw.c: Revert. * break-catch-syscall.c: Revert. * break-catch-sig.c: Revert. * blockframe.c: Revert. * block.c: Revert. * bfin-tdep.c: Revert. * bfin-linux-tdep.c: Revert. * bfd-target.c: Revert. * bcache.c: Revert. * ax-general.c: Revert. * ax-gdb.h: Revert. * ax-gdb.c: Revert. * avr-tdep.c: Revert. * auxv.c: Revert. * auto-load.c: Revert. * arm-wince-tdep.c: Revert. * arm-tdep.c: Revert. * arm-symbian-tdep.c: Revert. * arm-pikeos-tdep.c: Revert. * arm-obsd-tdep.c: Revert. * arm-nbsd-tdep.c: Revert. * arm-nbsd-nat.c: Revert. * arm-linux-tdep.c: Revert. * arm-linux-nat.c: Revert. * arm-fbsd-tdep.c: Revert. * arm-fbsd-nat.c: Revert. * arm-bsd-tdep.c: Revert. * arch-utils.c: Revert. * arc-tdep.c: Revert. * arc-newlib-tdep.c: Revert. * annotate.h: Revert. * annotate.c: Revert. * amd64-windows-tdep.c: Revert. * amd64-windows-nat.c: Revert. * amd64-tdep.c: Revert. * amd64-sol2-tdep.c: Revert. * amd64-obsd-tdep.c: Revert. * amd64-obsd-nat.c: Revert. * amd64-nbsd-tdep.c: Revert. * amd64-nbsd-nat.c: Revert. * amd64-nat.c: Revert. * amd64-linux-tdep.c: Revert. * amd64-linux-nat.c: Revert. * amd64-fbsd-tdep.c: Revert. * amd64-fbsd-nat.c: Revert. * amd64-dicos-tdep.c: Revert. * amd64-darwin-tdep.c: Revert. * amd64-bsd-nat.c: Revert. * alpha-tdep.c: Revert. * alpha-obsd-tdep.c: Revert. * alpha-nbsd-tdep.c: Revert. * alpha-mdebug-tdep.c: Revert. * alpha-linux-tdep.c: Revert. * alpha-linux-nat.c: Revert. * alpha-bsd-tdep.c: Revert. * alpha-bsd-nat.c: Revert. * aix-thread.c: Revert. * agent.c: Revert. * addrmap.c: Revert. * ada-varobj.c: Revert. * ada-valprint.c: Revert. * ada-typeprint.c: Revert. * ada-tasks.c: Revert. * ada-lang.c: Revert. * aarch64-tdep.c: Revert. * aarch64-ravenscar-thread.c: Revert. * aarch64-newlib-tdep.c: Revert. * aarch64-linux-tdep.c: Revert. * aarch64-linux-nat.c: Revert. * aarch64-fbsd-tdep.c: Revert. * aarch64-fbsd-nat.c: Revert. * aarch32-linux-nat.c: Revert.
552 lines
15 KiB
C
552 lines
15 KiB
C
/* BSD user-level threads support.
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Copyright (C) 2005-2019 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 "gdbcore.h"
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#include "gdbthread.h"
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#include "inferior.h"
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#include "objfiles.h"
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#include "observable.h"
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#include "regcache.h"
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#include "solib.h"
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#include "solist.h"
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#include "symfile.h"
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#include "target.h"
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#include "gdb_obstack.h"
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#include "bsd-uthread.h"
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static const target_info bsd_uthread_target_info = {
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"bsd-uthreads",
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N_("BSD user-level threads"),
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N_("BSD user-level threads")
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};
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struct bsd_uthread_target final : public target_ops
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{
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const target_info &info () const override
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{ return bsd_uthread_target_info; }
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strata stratum () const override { return thread_stratum; }
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void close () override;
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void mourn_inferior () override;
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void fetch_registers (struct regcache *, int) override;
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void store_registers (struct regcache *, int) override;
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ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
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void resume (ptid_t, int, enum gdb_signal) override;
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bool thread_alive (ptid_t ptid) override;
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void update_thread_list () override;
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const char *extra_thread_info (struct thread_info *) override;
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std::string pid_to_str (ptid_t) override;
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};
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static bsd_uthread_target bsd_uthread_ops;
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/* Architecture-specific operations. */
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/* Per-architecture data key. */
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static struct gdbarch_data *bsd_uthread_data;
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struct bsd_uthread_ops
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{
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/* Supply registers for an inactive thread to a register cache. */
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void (*supply_uthread)(struct regcache *, int, CORE_ADDR);
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/* Collect registers for an inactive thread from a register cache. */
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void (*collect_uthread)(const struct regcache *, int, CORE_ADDR);
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};
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static void *
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bsd_uthread_init (struct obstack *obstack)
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{
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struct bsd_uthread_ops *ops;
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ops = OBSTACK_ZALLOC (obstack, struct bsd_uthread_ops);
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return ops;
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}
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/* Set the function that supplies registers from an inactive thread
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for architecture GDBARCH to SUPPLY_UTHREAD. */
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void
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bsd_uthread_set_supply_uthread (struct gdbarch *gdbarch,
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void (*supply_uthread) (struct regcache *,
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int, CORE_ADDR))
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{
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struct bsd_uthread_ops *ops
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= (struct bsd_uthread_ops *) gdbarch_data (gdbarch, bsd_uthread_data);
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ops->supply_uthread = supply_uthread;
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}
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/* Set the function that collects registers for an inactive thread for
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architecture GDBARCH to SUPPLY_UTHREAD. */
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void
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bsd_uthread_set_collect_uthread (struct gdbarch *gdbarch,
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void (*collect_uthread) (const struct regcache *,
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int, CORE_ADDR))
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{
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struct bsd_uthread_ops *ops
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= (struct bsd_uthread_ops *) gdbarch_data (gdbarch, bsd_uthread_data);
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ops->collect_uthread = collect_uthread;
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}
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/* Magic number to help recognize a valid thread structure. */
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#define BSD_UTHREAD_PTHREAD_MAGIC 0xd09ba115
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/* Check whether the thread structure at ADDR is valid. */
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static void
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bsd_uthread_check_magic (CORE_ADDR addr)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
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ULONGEST magic = read_memory_unsigned_integer (addr, 4, byte_order);
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if (magic != BSD_UTHREAD_PTHREAD_MAGIC)
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error (_("Bad magic"));
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}
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/* Thread states. */
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#define BSD_UTHREAD_PS_RUNNING 0
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#define BSD_UTHREAD_PS_DEAD 18
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/* Address of the pointer to the thread structure for the running
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thread. */
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static CORE_ADDR bsd_uthread_thread_run_addr;
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/* Address of the list of all threads. */
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static CORE_ADDR bsd_uthread_thread_list_addr;
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/* Offsets of various "interesting" bits in the thread structure. */
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static int bsd_uthread_thread_state_offset = -1;
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static int bsd_uthread_thread_next_offset = -1;
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static int bsd_uthread_thread_ctx_offset;
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/* Name of shared threads library. */
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static const char *bsd_uthread_solib_name;
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/* Non-zero if the thread startum implemented by this module is active. */
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static int bsd_uthread_active;
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static CORE_ADDR
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bsd_uthread_lookup_address (const char *name, struct objfile *objfile)
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{
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struct bound_minimal_symbol sym;
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sym = lookup_minimal_symbol (name, NULL, objfile);
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if (sym.minsym)
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return BMSYMBOL_VALUE_ADDRESS (sym);
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return 0;
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}
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static int
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bsd_uthread_lookup_offset (const char *name, struct objfile *objfile)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
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CORE_ADDR addr;
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addr = bsd_uthread_lookup_address (name, objfile);
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if (addr == 0)
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return 0;
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return read_memory_unsigned_integer (addr, 4, byte_order);
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}
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static CORE_ADDR
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bsd_uthread_read_memory_address (CORE_ADDR addr)
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{
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struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
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return read_memory_typed_address (addr, ptr_type);
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}
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/* If OBJFILE contains the symbols corresponding to one of the
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supported user-level threads libraries, activate the thread stratum
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implemented by this module. */
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static int
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bsd_uthread_activate (struct objfile *objfile)
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{
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struct gdbarch *gdbarch = target_gdbarch ();
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struct bsd_uthread_ops *ops
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= (struct bsd_uthread_ops *) gdbarch_data (gdbarch, bsd_uthread_data);
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/* Skip if the thread stratum has already been activated. */
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if (bsd_uthread_active)
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return 0;
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/* There's no point in enabling this module if no
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architecture-specific operations are provided. */
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if (!ops->supply_uthread)
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return 0;
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bsd_uthread_thread_run_addr =
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bsd_uthread_lookup_address ("_thread_run", objfile);
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if (bsd_uthread_thread_run_addr == 0)
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return 0;
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bsd_uthread_thread_list_addr =
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bsd_uthread_lookup_address ("_thread_list", objfile);
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if (bsd_uthread_thread_list_addr == 0)
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return 0;
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bsd_uthread_thread_state_offset =
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bsd_uthread_lookup_offset ("_thread_state_offset", objfile);
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if (bsd_uthread_thread_state_offset == 0)
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return 0;
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bsd_uthread_thread_next_offset =
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bsd_uthread_lookup_offset ("_thread_next_offset", objfile);
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if (bsd_uthread_thread_next_offset == 0)
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return 0;
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bsd_uthread_thread_ctx_offset =
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bsd_uthread_lookup_offset ("_thread_ctx_offset", objfile);
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push_target (&bsd_uthread_ops);
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bsd_uthread_active = 1;
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return 1;
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}
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/* Cleanup due to deactivation. */
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void
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bsd_uthread_target::close ()
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{
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bsd_uthread_active = 0;
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bsd_uthread_thread_run_addr = 0;
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bsd_uthread_thread_list_addr = 0;
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bsd_uthread_thread_state_offset = 0;
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bsd_uthread_thread_next_offset = 0;
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bsd_uthread_thread_ctx_offset = 0;
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bsd_uthread_solib_name = NULL;
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}
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/* Deactivate the thread stratum implemented by this module. */
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static void
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bsd_uthread_deactivate (void)
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{
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/* Skip if the thread stratum has already been deactivated. */
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if (!bsd_uthread_active)
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return;
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unpush_target (&bsd_uthread_ops);
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}
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static void
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bsd_uthread_inferior_created (struct target_ops *ops, int from_tty)
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{
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bsd_uthread_activate (NULL);
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}
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/* Likely candidates for the threads library. */
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static const char *bsd_uthread_solib_names[] =
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{
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"/usr/lib/libc_r.so", /* FreeBSD */
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"/usr/lib/libpthread.so", /* OpenBSD */
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NULL
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};
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static void
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bsd_uthread_solib_loaded (struct so_list *so)
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{
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const char **names = bsd_uthread_solib_names;
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for (names = bsd_uthread_solib_names; *names; names++)
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{
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if (startswith (so->so_original_name, *names))
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{
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solib_read_symbols (so, 0);
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if (bsd_uthread_activate (so->objfile))
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{
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bsd_uthread_solib_name = so->so_original_name;
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return;
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}
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}
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}
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}
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static void
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bsd_uthread_solib_unloaded (struct so_list *so)
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{
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if (!bsd_uthread_solib_name)
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return;
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if (strcmp (so->so_original_name, bsd_uthread_solib_name) == 0)
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bsd_uthread_deactivate ();
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}
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void
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bsd_uthread_target::mourn_inferior ()
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{
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beneath ()->mourn_inferior ();
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bsd_uthread_deactivate ();
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}
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void
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bsd_uthread_target::fetch_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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struct bsd_uthread_ops *uthread_ops
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= (struct bsd_uthread_ops *) gdbarch_data (gdbarch, bsd_uthread_data);
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ptid_t ptid = regcache->ptid ();
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CORE_ADDR addr = ptid.tid ();
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CORE_ADDR active_addr;
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scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
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/* We are doing operations (e.g. reading memory) that rely on
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inferior_ptid. */
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inferior_ptid = ptid;
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/* Always fetch the appropriate registers from the layer beneath. */
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beneath ()->fetch_registers (regcache, regnum);
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/* FIXME: That might have gotten us more than we asked for. Make
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sure we overwrite all relevant registers with values from the
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thread structure. This can go once we fix the underlying target. */
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regnum = -1;
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active_addr = bsd_uthread_read_memory_address (bsd_uthread_thread_run_addr);
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if (addr != 0 && addr != active_addr)
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{
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bsd_uthread_check_magic (addr);
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uthread_ops->supply_uthread (regcache, regnum,
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addr + bsd_uthread_thread_ctx_offset);
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}
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}
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void
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bsd_uthread_target::store_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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struct bsd_uthread_ops *uthread_ops
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= (struct bsd_uthread_ops *) gdbarch_data (gdbarch, bsd_uthread_data);
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ptid_t ptid = regcache->ptid ();
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CORE_ADDR addr = ptid.tid ();
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CORE_ADDR active_addr;
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scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
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/* We are doing operations (e.g. reading memory) that rely on
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inferior_ptid. */
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inferior_ptid = ptid;
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active_addr = bsd_uthread_read_memory_address (bsd_uthread_thread_run_addr);
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if (addr != 0 && addr != active_addr)
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{
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bsd_uthread_check_magic (addr);
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uthread_ops->collect_uthread (regcache, regnum,
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addr + bsd_uthread_thread_ctx_offset);
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}
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else
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{
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/* Updating the thread that is currently running; pass the
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request to the layer beneath. */
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beneath ()->store_registers (regcache, regnum);
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}
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}
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ptid_t
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bsd_uthread_target::wait (ptid_t ptid, struct target_waitstatus *status,
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int options)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
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CORE_ADDR addr;
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/* Pass the request to the layer beneath. */
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ptid = beneath ()->wait (ptid, status, options);
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/* If the process is no longer alive, there's no point in figuring
|
||
out the thread ID. It will fail anyway. */
|
||
if (status->kind == TARGET_WAITKIND_SIGNALLED
|
||
|| status->kind == TARGET_WAITKIND_EXITED)
|
||
return ptid;
|
||
|
||
/* Fetch the corresponding thread ID, and augment the returned
|
||
process ID with it. */
|
||
addr = bsd_uthread_read_memory_address (bsd_uthread_thread_run_addr);
|
||
if (addr != 0)
|
||
{
|
||
gdb_byte buf[4];
|
||
|
||
/* FIXME: For executables linked statically with the threads
|
||
library, we end up here before the program has actually been
|
||
executed. In that case ADDR will be garbage since it has
|
||
been read from the wrong virtual memory image. */
|
||
if (target_read_memory (addr, buf, 4) == 0)
|
||
{
|
||
ULONGEST magic = extract_unsigned_integer (buf, 4, byte_order);
|
||
if (magic == BSD_UTHREAD_PTHREAD_MAGIC)
|
||
ptid = ptid_t (ptid.pid (), 0, addr);
|
||
}
|
||
}
|
||
|
||
/* If INFERIOR_PTID doesn't have a tid member yet, and we now have a
|
||
ptid with tid set, then ptid is still the initial thread of
|
||
the process. Notify GDB core about it. */
|
||
if (inferior_ptid.tid () == 0
|
||
&& ptid.tid () != 0 && !in_thread_list (ptid))
|
||
thread_change_ptid (inferior_ptid, ptid);
|
||
|
||
/* Don't let the core see a ptid without a corresponding thread. */
|
||
thread_info *thread = find_thread_ptid (ptid);
|
||
if (thread == NULL || thread->state == THREAD_EXITED)
|
||
add_thread (ptid);
|
||
|
||
return ptid;
|
||
}
|
||
|
||
void
|
||
bsd_uthread_target::resume (ptid_t ptid, int step, enum gdb_signal sig)
|
||
{
|
||
/* Pass the request to the layer beneath. */
|
||
beneath ()->resume (ptid, step, sig);
|
||
}
|
||
|
||
bool
|
||
bsd_uthread_target::thread_alive (ptid_t ptid)
|
||
{
|
||
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
|
||
CORE_ADDR addr = ptid.tid ();
|
||
|
||
if (addr != 0)
|
||
{
|
||
int offset = bsd_uthread_thread_state_offset;
|
||
ULONGEST state;
|
||
|
||
bsd_uthread_check_magic (addr);
|
||
|
||
state = read_memory_unsigned_integer (addr + offset, 4, byte_order);
|
||
if (state == BSD_UTHREAD_PS_DEAD)
|
||
return false;
|
||
}
|
||
|
||
return beneath ()->thread_alive (ptid);
|
||
}
|
||
|
||
void
|
||
bsd_uthread_target::update_thread_list ()
|
||
{
|
||
pid_t pid = inferior_ptid.pid ();
|
||
int offset = bsd_uthread_thread_next_offset;
|
||
CORE_ADDR addr;
|
||
|
||
prune_threads ();
|
||
|
||
addr = bsd_uthread_read_memory_address (bsd_uthread_thread_list_addr);
|
||
while (addr != 0)
|
||
{
|
||
ptid_t ptid = ptid_t (pid, 0, addr);
|
||
|
||
thread_info *thread = find_thread_ptid (ptid);
|
||
if (thread == nullptr || thread->state == THREAD_EXITED)
|
||
{
|
||
/* If INFERIOR_PTID doesn't have a tid member yet, then ptid
|
||
is still the initial thread of the process. Notify GDB
|
||
core about it. */
|
||
if (inferior_ptid.tid () == 0)
|
||
thread_change_ptid (inferior_ptid, ptid);
|
||
else
|
||
add_thread (ptid);
|
||
}
|
||
|
||
addr = bsd_uthread_read_memory_address (addr + offset);
|
||
}
|
||
}
|
||
|
||
/* Possible states a thread can be in. */
|
||
static const char *bsd_uthread_state[] =
|
||
{
|
||
"RUNNING",
|
||
"SIGTHREAD",
|
||
"MUTEX_WAIT",
|
||
"COND_WAIT",
|
||
"FDLR_WAIT",
|
||
"FDLW_WAIT",
|
||
"FDR_WAIT",
|
||
"FDW_WAIT",
|
||
"FILE_WAIT",
|
||
"POLL_WAIT",
|
||
"SELECT_WAIT",
|
||
"SLEEP_WAIT",
|
||
"WAIT_WAIT",
|
||
"SIGSUSPEND",
|
||
"SIGWAIT",
|
||
"SPINBLOCK",
|
||
"JOIN",
|
||
"SUSPENDED",
|
||
"DEAD",
|
||
"DEADLOCK"
|
||
};
|
||
|
||
/* Return a string describing th state of the thread specified by
|
||
INFO. */
|
||
|
||
const char *
|
||
bsd_uthread_target::extra_thread_info (thread_info *info)
|
||
{
|
||
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
|
||
CORE_ADDR addr = info->ptid.tid ();
|
||
|
||
if (addr != 0)
|
||
{
|
||
int offset = bsd_uthread_thread_state_offset;
|
||
ULONGEST state;
|
||
|
||
state = read_memory_unsigned_integer (addr + offset, 4, byte_order);
|
||
if (state < ARRAY_SIZE (bsd_uthread_state))
|
||
return bsd_uthread_state[state];
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
std::string
|
||
bsd_uthread_target::pid_to_str (ptid_t ptid)
|
||
{
|
||
if (ptid.tid () != 0)
|
||
return string_printf ("process %d, thread 0x%lx",
|
||
ptid.pid (), ptid.tid ());
|
||
|
||
return normal_pid_to_str (ptid);
|
||
}
|
||
|
||
void
|
||
_initialize_bsd_uthread (void)
|
||
{
|
||
bsd_uthread_data = gdbarch_data_register_pre_init (bsd_uthread_init);
|
||
|
||
gdb::observers::inferior_created.attach (bsd_uthread_inferior_created);
|
||
gdb::observers::solib_loaded.attach (bsd_uthread_solib_loaded);
|
||
gdb::observers::solib_unloaded.attach (bsd_uthread_solib_unloaded);
|
||
}
|