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bcecc11da2
This permits reading the value of the SSTATUS CSR returned by ptrace() for live FreeBSD/riscv processes. * riscv-fbsd-nat.c (getregs_supplies): Return true for RISCV_CSR_SSTATUS_REGNUM.
137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
/* Native-dependent code for FreeBSD/riscv.
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Copyright (C) 2018 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 "target.h"
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include "fbsd-nat.h"
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#include "riscv-tdep.h"
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#include "riscv-fbsd-tdep.h"
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#include "inf-ptrace.h"
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struct riscv_fbsd_nat_target final : public fbsd_nat_target
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{
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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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};
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static riscv_fbsd_nat_target the_riscv_fbsd_nat_target;
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/* Determine if PT_GETREGS fetches REGNUM. */
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static bool
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getregs_supplies (struct gdbarch *gdbarch, int regnum)
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{
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return ((regnum >= RISCV_RA_REGNUM && regnum <= RISCV_PC_REGNUM)
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|| regnum == RISCV_CSR_SSTATUS_REGNUM);
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}
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/* Determine if PT_GETFPREGS fetches REGNUM. */
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static bool
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getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
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{
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return ((regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM)
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|| regnum == RISCV_CSR_FCSR_REGNUM);
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}
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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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riscv_fbsd_nat_target::fetch_registers (struct regcache *regcache,
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int regnum)
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{
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pid_t pid = get_ptrace_pid (regcache->ptid ());
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struct gdbarch *gdbarch = regcache->arch ();
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if (regnum == -1 || regnum == RISCV_ZERO_REGNUM)
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regcache->raw_supply_zeroed (RISCV_ZERO_REGNUM);
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if (regnum == -1 || getregs_supplies (gdbarch, regnum))
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{
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struct reg regs;
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if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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regcache->supply_regset (&riscv_fbsd_gregset, regnum, ®s,
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sizeof (regs));
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}
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if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
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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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regcache->supply_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
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sizeof (fpregs));
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}
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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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riscv_fbsd_nat_target::store_registers (struct regcache *regcache,
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int regnum)
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{
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pid_t pid = get_ptrace_pid (regcache->ptid ());
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struct gdbarch *gdbarch = regcache->arch ();
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if (regnum == -1 || getregs_supplies (gdbarch, regnum))
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{
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struct reg regs;
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if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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regcache->collect_regset (&riscv_fbsd_gregset, regnum, ®s,
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sizeof (regs));
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if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't write registers"));
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}
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if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
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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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regcache->collect_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
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sizeof (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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}
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void
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_initialize_riscv_fbsd_nat (void)
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{
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add_inf_child_target (&the_riscv_fbsd_nat_target);
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}
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