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/* Native-dependent code for FreeBSD/i386.
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Copyright (C) 2001-2022 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 "regcache.h"
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#include "target.h"
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include "i386-tdep.h"
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#include "i386-fbsd-tdep.h"
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#include "i387-tdep.h"
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#include "x86-nat.h"
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#include "gdbsupport/x86-xstate.h"
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#include "x86-fbsd-nat.h"
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class i386_fbsd_nat_target final : public x86_fbsd_nat_target
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{
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public:
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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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const struct target_desc *read_description () override;
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void resume (ptid_t, int, enum gdb_signal) override;
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};
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static i386_fbsd_nat_target the_i386_fbsd_nat_target;
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#ifdef PT_GETXSTATE_INFO
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static size_t xsave_len;
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#endif
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static int have_ptrace_xmmregs;
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/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
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for all registers. */
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void
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i386_fbsd_nat_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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pid_t pid = get_ptrace_pid (regcache->ptid ());
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if (fetch_register_set<struct reg> (regcache, regnum, PT_GETREGS,
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&i386_fbsd_gregset))
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{
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if (regnum != -1)
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return;
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}
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#ifdef PT_GETFSBASE
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if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
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{
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register_t base;
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if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
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perror_with_name (_("Couldn't get segment register fs_base"));
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regcache->raw_supply (I386_FSBASE_REGNUM, &base);
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if (regnum != -1)
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return;
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}
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#endif
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#ifdef PT_GETGSBASE
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if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
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{
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register_t base;
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if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
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perror_with_name (_("Couldn't get segment register gs_base"));
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regcache->raw_supply (I386_GSBASE_REGNUM, &base);
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if (regnum != -1)
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return;
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}
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#endif
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/* There is no i386_fxsave_supplies or i386_xsave_supplies.
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Instead, the earlier register sets return early if the request
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was for a specific register that was already satisified to avoid
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fetching the FPU/XSAVE state unnecessarily. */
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#ifdef PT_GETXSTATE_INFO
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if (xsave_len != 0)
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{
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void *xstateregs = alloca (xsave_len);
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if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
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perror_with_name (_("Couldn't get extended state status"));
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i387_supply_xsave (regcache, regnum, xstateregs);
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return;
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}
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#endif
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if (have_ptrace_xmmregs != 0)
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{
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char xmmregs[I387_SIZEOF_FXSAVE];
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if (ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
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perror_with_name (_("Couldn't get XMM registers"));
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i387_supply_fxsave (regcache, regnum, xmmregs);
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return;
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}
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struct fpreg fpregs;
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if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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i387_supply_fsave (regcache, regnum, &fpregs);
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}
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/* Store register REGNUM back into the inferior. If REGNUM is -1, do
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this for all registers. */
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void
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i386_fbsd_nat_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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pid_t pid = get_ptrace_pid (regcache->ptid ());
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if (store_register_set<struct reg> (regcache, regnum, PT_GETREGS, PT_SETREGS,
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&i386_fbsd_gregset))
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{
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if (regnum != -1)
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return;
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}
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#ifdef PT_SETFSBASE
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if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
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{
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register_t base;
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regcache->raw_collect (I386_FSBASE_REGNUM, &base);
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if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
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perror_with_name (_("Couldn't write segment register fs_base"));
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if (regnum != -1)
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return;
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}
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#endif
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#ifdef PT_SETGSBASE
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if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
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{
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register_t base;
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regcache->raw_collect (I386_GSBASE_REGNUM, &base);
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if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
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perror_with_name (_("Couldn't write segment register gs_base"));
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if (regnum != -1)
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return;
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}
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#endif
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/* There is no i386_fxsave_supplies or i386_xsave_supplies.
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Instead, the earlier register sets return early if the request
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was for a specific register that was already satisified to avoid
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fetching the FPU/XSAVE state unnecessarily. */
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#ifdef PT_GETXSTATE_INFO
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if (xsave_len != 0)
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{
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void *xstateregs = alloca (xsave_len);
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if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
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perror_with_name (_("Couldn't get extended state status"));
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i387_collect_xsave (regcache, regnum, xstateregs, 0);
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if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, xsave_len)
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== -1)
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perror_with_name (_("Couldn't write extended state status"));
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return;
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}
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#endif
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if (have_ptrace_xmmregs != 0)
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{
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char xmmregs[I387_SIZEOF_FXSAVE];
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if (ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
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perror_with_name (_("Couldn't get XMM registers"));
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i387_collect_fxsave (regcache, regnum, xmmregs);
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if (ptrace (PT_SETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
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perror_with_name (_("Couldn't write XMM registers"));
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return;
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}
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struct fpreg fpregs;
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if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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i387_collect_fsave (regcache, regnum, &fpregs);
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if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't write floating point status"));
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}
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/* Resume execution of the inferior process. If STEP is nonzero,
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single-step it. If SIGNAL is nonzero, give it that signal. */
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void
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i386_fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
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{
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pid_t pid = ptid.pid ();
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int request = PT_STEP;
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if (pid == -1)
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/* Resume all threads. This only gets used in the non-threaded
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case, where "resume all threads" and "resume inferior_ptid" are
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the same. */
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pid = inferior_ptid.pid ();
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if (!step)
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{
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struct regcache *regcache = get_current_regcache ();
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ULONGEST eflags;
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/* Workaround for a bug in FreeBSD. Make sure that the trace
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flag is off when doing a continue. There is a code path
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through the kernel which leaves the flag set when it should
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have been cleared. If a process has a signal pending (such
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as SIGALRM) and we do a PT_STEP, the process never really has
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a chance to run because the kernel needs to notify the
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debugger that a signal is being sent. Therefore, the process
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never goes through the kernel's trap() function which would
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normally clear it. */
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regcache_cooked_read_unsigned (regcache, I386_EFLAGS_REGNUM,
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&eflags);
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if (eflags & 0x0100)
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regcache_cooked_write_unsigned (regcache, I386_EFLAGS_REGNUM,
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eflags & ~0x0100);
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request = PT_CONTINUE;
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}
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/* An addres of (caddr_t) 1 tells ptrace to continue from where it
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was. (If GDB wanted it to start some other way, we have already
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written a new PC value to the child.) */
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if (ptrace (request, pid, (caddr_t) 1,
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gdb_signal_to_host (signal)) == -1)
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perror_with_name (("ptrace"));
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}
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/* Support for debugging kernel virtual memory images. */
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#include <machine/pcb.h>
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#include "bsd-kvm.h"
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static int
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i386fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
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{
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/* The following is true for FreeBSD 4.7:
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The pcb contains %eip, %ebx, %esp, %ebp, %esi, %edi and %gs.
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This accounts for all callee-saved registers specified by the
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psABI and then some. Here %esp contains the stack pointer at the
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point just after the call to cpu_switch(). From this information
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we reconstruct the register state as it would look when we just
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returned from cpu_switch(). */
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/* The stack pointer shouldn't be zero. */
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if (pcb->pcb_esp == 0)
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return 0;
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pcb->pcb_esp += 4;
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regcache->raw_supply (I386_EDI_REGNUM, &pcb->pcb_edi);
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regcache->raw_supply (I386_ESI_REGNUM, &pcb->pcb_esi);
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regcache->raw_supply (I386_EBP_REGNUM, &pcb->pcb_ebp);
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regcache->raw_supply (I386_ESP_REGNUM, &pcb->pcb_esp);
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regcache->raw_supply (I386_EBX_REGNUM, &pcb->pcb_ebx);
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regcache->raw_supply (I386_EIP_REGNUM, &pcb->pcb_eip);
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regcache->raw_supply (I386_GS_REGNUM, &pcb->pcb_gs);
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return 1;
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}
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/* Implement the read_description method. */
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const struct target_desc *
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i386_fbsd_nat_target::read_description ()
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{
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#ifdef PT_GETXSTATE_INFO
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static int xsave_probed;
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static uint64_t xcr0;
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#endif
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static int xmm_probed;
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#ifdef PT_GETXSTATE_INFO
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if (!xsave_probed)
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{
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struct ptrace_xstate_info info;
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if (ptrace (PT_GETXSTATE_INFO, inferior_ptid.pid (),
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(PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
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{
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xsave_len = info.xsave_len;
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xcr0 = info.xsave_mask;
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}
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xsave_probed = 1;
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}
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if (xsave_len != 0)
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return i386_target_description (xcr0, true);
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#endif
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if (!xmm_probed)
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{
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char xmmregs[I387_SIZEOF_FXSAVE];
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if (ptrace (PT_GETXMMREGS, inferior_ptid.pid (),
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(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
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have_ptrace_xmmregs = 1;
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xmm_probed = 1;
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}
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if (have_ptrace_xmmregs)
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return i386_target_description (X86_XSTATE_SSE_MASK, true);
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return i386_target_description (X86_XSTATE_X87_MASK, true);
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}
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void _initialize_i386fbsd_nat ();
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void
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_initialize_i386fbsd_nat ()
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{
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add_inf_child_target (&the_i386_fbsd_nat_target);
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/* Support debugging kernel virtual memory images. */
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bsd_kvm_add_target (i386fbsd_supply_pcb);
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}
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