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562 lines
17 KiB
C
562 lines
17 KiB
C
/* Target-dependent code for FreeBSD/mips.
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Copyright (C) 2017-2020 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 "osabi.h"
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#include "regset.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "fbsd-tdep.h"
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#include "mips-tdep.h"
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#include "mips-fbsd-tdep.h"
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#include "solib-svr4.h"
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/* Core file support. */
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/* Number of registers in `struct reg' from <machine/reg.h>. The
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first 38 follow the standard MIPS layout. The 39th holds
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IC_INT_REG on RM7K and RM9K processors. The 40th is a dummy for
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padding. */
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#define MIPS_FBSD_NUM_GREGS 40
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/* Number of registers in `struct fpreg' from <machine/reg.h>. The
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first 32 hold floating point registers. 33 holds the FSR. The
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34th holds FIR on FreeBSD 12.0 and newer kernels. On older kernels
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it was a zero-filled dummy for padding. */
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#define MIPS_FBSD_NUM_FPREGS 34
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/* Supply a single register. The register size might not match, so use
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regcache->raw_supply_integer (). */
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static void
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mips_fbsd_supply_reg (struct regcache *regcache, int regnum, const void *addr,
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size_t len)
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{
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regcache->raw_supply_integer (regnum, (const gdb_byte *) addr, len, true);
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}
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/* Collect a single register. The register size might not match, so use
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regcache->raw_collect_integer (). */
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static void
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mips_fbsd_collect_reg (const struct regcache *regcache, int regnum, void *addr,
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size_t len)
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{
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regcache->raw_collect_integer (regnum, (gdb_byte *) addr, len, true);
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}
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/* Supply the floating-point registers stored in FPREGS to REGCACHE.
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Each floating-point register in FPREGS is REGSIZE bytes in
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length. */
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void
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mips_fbsd_supply_fpregs (struct regcache *regcache, int regnum,
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const void *fpregs, size_t regsize)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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const gdb_byte *regs = (const gdb_byte *) fpregs;
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int i, fp0num;
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fp0num = mips_regnum (gdbarch)->fp0;
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for (i = 0; i <= 32; i++)
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if (regnum == fp0num + i || regnum == -1)
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mips_fbsd_supply_reg (regcache, fp0num + i,
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regs + i * regsize, regsize);
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if (regnum == mips_regnum (gdbarch)->fp_control_status || regnum == -1)
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mips_fbsd_supply_reg (regcache, mips_regnum (gdbarch)->fp_control_status,
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regs + 32 * regsize, regsize);
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if ((regnum == mips_regnum (gdbarch)->fp_implementation_revision
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|| regnum == -1)
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&& extract_unsigned_integer (regs + 33 * regsize, regsize,
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gdbarch_byte_order (gdbarch)) != 0)
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mips_fbsd_supply_reg (regcache,
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mips_regnum (gdbarch)->fp_implementation_revision,
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regs + 33 * regsize, regsize);
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}
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/* Supply the general-purpose registers stored in GREGS to REGCACHE.
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Each general-purpose register in GREGS is REGSIZE bytes in
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length. */
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void
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mips_fbsd_supply_gregs (struct regcache *regcache, int regnum,
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const void *gregs, size_t regsize)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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const gdb_byte *regs = (const gdb_byte *) gregs;
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int i;
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for (i = 0; i <= mips_regnum (gdbarch)->pc; i++)
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if (regnum == i || regnum == -1)
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mips_fbsd_supply_reg (regcache, i, regs + i * regsize, regsize);
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}
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/* Collect the floating-point registers from REGCACHE and store them
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in FPREGS. Each floating-point register in FPREGS is REGSIZE bytes
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in length. */
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void
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mips_fbsd_collect_fpregs (const struct regcache *regcache, int regnum,
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void *fpregs, size_t regsize)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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gdb_byte *regs = (gdb_byte *) fpregs;
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int i, fp0num;
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fp0num = mips_regnum (gdbarch)->fp0;
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for (i = 0; i < 32; i++)
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if (regnum == fp0num + i || regnum == -1)
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mips_fbsd_collect_reg (regcache, fp0num + i,
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regs + i * regsize, regsize);
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if (regnum == mips_regnum (gdbarch)->fp_control_status || regnum == -1)
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mips_fbsd_collect_reg (regcache, mips_regnum (gdbarch)->fp_control_status,
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regs + 32 * regsize, regsize);
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if (regnum == mips_regnum (gdbarch)->fp_implementation_revision
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|| regnum == -1)
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mips_fbsd_collect_reg (regcache,
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mips_regnum (gdbarch)->fp_implementation_revision,
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regs + 33 * regsize, regsize);
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}
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/* Collect the general-purpose registers from REGCACHE and store them
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in GREGS. Each general-purpose register in GREGS is REGSIZE bytes
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in length. */
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void
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mips_fbsd_collect_gregs (const struct regcache *regcache, int regnum,
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void *gregs, size_t regsize)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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gdb_byte *regs = (gdb_byte *) gregs;
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int i;
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for (i = 0; i <= mips_regnum (gdbarch)->pc; i++)
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if (regnum == i || regnum == -1)
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mips_fbsd_collect_reg (regcache, i, regs + i * regsize, regsize);
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}
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/* Supply register REGNUM from the buffer specified by FPREGS and LEN
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in the floating-point register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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mips_fbsd_supply_fpregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *fpregs, size_t len)
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{
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size_t regsize = mips_abi_regsize (regcache->arch ());
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gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);
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mips_fbsd_supply_fpregs (regcache, regnum, fpregs, regsize);
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}
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/* Collect register REGNUM from the register cache REGCACHE and store
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it in the buffer specified by FPREGS and LEN in the floating-point
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register set REGSET. If REGNUM is -1, do this for all registers in
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REGSET. */
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static void
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mips_fbsd_collect_fpregset (const struct regset *regset,
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const struct regcache *regcache,
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int regnum, void *fpregs, size_t len)
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{
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size_t regsize = mips_abi_regsize (regcache->arch ());
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gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);
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mips_fbsd_collect_fpregs (regcache, regnum, fpregs, regsize);
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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mips_fbsd_supply_gregset (const struct regset *regset,
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struct regcache *regcache, int regnum,
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const void *gregs, size_t len)
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{
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size_t regsize = mips_abi_regsize (regcache->arch ());
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gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);
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mips_fbsd_supply_gregs (regcache, regnum, gregs, regsize);
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}
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/* Collect register REGNUM from the register cache REGCACHE and store
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it in the buffer specified by GREGS and LEN in the general-purpose
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register set REGSET. If REGNUM is -1, do this for all registers in
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REGSET. */
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static void
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mips_fbsd_collect_gregset (const struct regset *regset,
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const struct regcache *regcache,
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int regnum, void *gregs, size_t len)
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{
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size_t regsize = mips_abi_regsize (regcache->arch ());
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gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);
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mips_fbsd_collect_gregs (regcache, regnum, gregs, regsize);
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}
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/* FreeBSD/mips register sets. */
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static const struct regset mips_fbsd_gregset =
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{
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NULL,
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mips_fbsd_supply_gregset,
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mips_fbsd_collect_gregset,
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};
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static const struct regset mips_fbsd_fpregset =
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{
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NULL,
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mips_fbsd_supply_fpregset,
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mips_fbsd_collect_fpregset,
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};
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/* Iterate over core file register note sections. */
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static void
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mips_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
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iterate_over_regset_sections_cb *cb,
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void *cb_data,
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const struct regcache *regcache)
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{
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size_t regsize = mips_abi_regsize (gdbarch);
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cb (".reg", MIPS_FBSD_NUM_GREGS * regsize, MIPS_FBSD_NUM_GREGS * regsize,
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&mips_fbsd_gregset, NULL, cb_data);
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cb (".reg2", MIPS_FBSD_NUM_FPREGS * regsize, MIPS_FBSD_NUM_FPREGS * regsize,
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&mips_fbsd_fpregset, NULL, cb_data);
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}
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/* Signal trampoline support. */
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#define FBSD_SYS_sigreturn 417
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#define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + FBSD_SYS_sigreturn
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#define MIPS_INST_SYSCALL 0x0000000c
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#define MIPS_INST_BREAK 0x0000000d
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#define O32_SIGFRAME_UCONTEXT_OFFSET (16)
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#define O32_SIGSET_T_SIZE (16)
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#define O32_UCONTEXT_ONSTACK (O32_SIGSET_T_SIZE)
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#define O32_UCONTEXT_PC (O32_UCONTEXT_ONSTACK + 4)
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#define O32_UCONTEXT_REGS (O32_UCONTEXT_PC + 4)
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#define O32_UCONTEXT_SR (O32_UCONTEXT_REGS + 4 * 32)
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#define O32_UCONTEXT_LO (O32_UCONTEXT_SR + 4)
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#define O32_UCONTEXT_HI (O32_UCONTEXT_LO + 4)
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#define O32_UCONTEXT_FPUSED (O32_UCONTEXT_HI + 4)
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#define O32_UCONTEXT_FPREGS (O32_UCONTEXT_FPUSED + 4)
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#define O32_UCONTEXT_REG_SIZE 4
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static void
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mips_fbsd_sigframe_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR sp, ucontext_addr, addr;
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int regnum;
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gdb_byte buf[4];
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/* We find the appropriate instance of `ucontext_t' at a
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fixed offset in the signal frame. */
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sp = get_frame_register_signed (this_frame,
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MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
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ucontext_addr = sp + O32_SIGFRAME_UCONTEXT_OFFSET;
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/* PC. */
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regnum = mips_regnum (gdbarch)->pc;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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ucontext_addr + O32_UCONTEXT_PC);
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/* GPRs. */
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for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + O32_UCONTEXT_REGS;
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regnum <= MIPS_RA_REGNUM; regnum++, addr += O32_UCONTEXT_REG_SIZE)
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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addr);
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regnum = MIPS_PS_REGNUM;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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ucontext_addr + O32_UCONTEXT_SR);
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/* HI and LO. */
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regnum = mips_regnum (gdbarch)->lo;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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ucontext_addr + O32_UCONTEXT_LO);
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regnum = mips_regnum (gdbarch)->hi;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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ucontext_addr + O32_UCONTEXT_HI);
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if (target_read_memory (ucontext_addr + O32_UCONTEXT_FPUSED, buf, 4) == 0
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&& extract_unsigned_integer (buf, 4, byte_order) != 0)
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{
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for (regnum = 0, addr = ucontext_addr + O32_UCONTEXT_FPREGS;
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regnum < 32; regnum++, addr += O32_UCONTEXT_REG_SIZE)
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_fp0_regnum (gdbarch),
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addr);
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trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
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addr);
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}
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trad_frame_set_id (cache, frame_id_build (sp, func));
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}
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#define MIPS_INST_ADDIU_A0_SP_O32 (0x27a40000 \
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+ O32_SIGFRAME_UCONTEXT_OFFSET)
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static const struct tramp_frame mips_fbsd_sigframe =
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{
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SIGTRAMP_FRAME,
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MIPS_INSN32_SIZE,
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{
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{ MIPS_INST_ADDIU_A0_SP_O32, ULONGEST_MAX }, /* addiu a0, sp, SIGF_UC */
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{ MIPS_INST_LI_V0_SIGRETURN, ULONGEST_MAX }, /* li v0, SYS_sigreturn */
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{ MIPS_INST_SYSCALL, ULONGEST_MAX }, /* syscall */
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{ MIPS_INST_BREAK, ULONGEST_MAX }, /* break */
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{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
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},
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mips_fbsd_sigframe_init
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};
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#define N64_SIGFRAME_UCONTEXT_OFFSET (32)
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#define N64_SIGSET_T_SIZE (16)
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#define N64_UCONTEXT_ONSTACK (N64_SIGSET_T_SIZE)
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#define N64_UCONTEXT_PC (N64_UCONTEXT_ONSTACK + 8)
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#define N64_UCONTEXT_REGS (N64_UCONTEXT_PC + 8)
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#define N64_UCONTEXT_SR (N64_UCONTEXT_REGS + 8 * 32)
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#define N64_UCONTEXT_LO (N64_UCONTEXT_SR + 8)
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#define N64_UCONTEXT_HI (N64_UCONTEXT_LO + 8)
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#define N64_UCONTEXT_FPUSED (N64_UCONTEXT_HI + 8)
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#define N64_UCONTEXT_FPREGS (N64_UCONTEXT_FPUSED + 8)
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#define N64_UCONTEXT_REG_SIZE 8
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static void
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mips64_fbsd_sigframe_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR sp, ucontext_addr, addr;
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int regnum;
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gdb_byte buf[4];
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/* We find the appropriate instance of `ucontext_t' at a
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fixed offset in the signal frame. */
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sp = get_frame_register_signed (this_frame,
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MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
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ucontext_addr = sp + N64_SIGFRAME_UCONTEXT_OFFSET;
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/* PC. */
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regnum = mips_regnum (gdbarch)->pc;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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ucontext_addr + N64_UCONTEXT_PC);
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/* GPRs. */
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for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + N64_UCONTEXT_REGS;
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regnum <= MIPS_RA_REGNUM; regnum++, addr += N64_UCONTEXT_REG_SIZE)
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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addr);
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regnum = MIPS_PS_REGNUM;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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ucontext_addr + N64_UCONTEXT_SR);
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/* HI and LO. */
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regnum = mips_regnum (gdbarch)->lo;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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ucontext_addr + N64_UCONTEXT_LO);
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regnum = mips_regnum (gdbarch)->hi;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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ucontext_addr + N64_UCONTEXT_HI);
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if (target_read_memory (ucontext_addr + N64_UCONTEXT_FPUSED, buf, 4) == 0
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&& extract_unsigned_integer (buf, 4, byte_order) != 0)
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{
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for (regnum = 0, addr = ucontext_addr + N64_UCONTEXT_FPREGS;
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regnum < 32; regnum++, addr += N64_UCONTEXT_REG_SIZE)
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_fp0_regnum (gdbarch),
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addr);
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trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
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addr);
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}
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trad_frame_set_id (cache, frame_id_build (sp, func));
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}
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#define MIPS_INST_ADDIU_A0_SP_N32 (0x27a40000 \
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+ N64_SIGFRAME_UCONTEXT_OFFSET)
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static const struct tramp_frame mipsn32_fbsd_sigframe =
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{
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SIGTRAMP_FRAME,
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MIPS_INSN32_SIZE,
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{
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{ MIPS_INST_ADDIU_A0_SP_N32, ULONGEST_MAX }, /* addiu a0, sp, SIGF_UC */
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{ MIPS_INST_LI_V0_SIGRETURN, ULONGEST_MAX }, /* li v0, SYS_sigreturn */
|
|
{ MIPS_INST_SYSCALL, ULONGEST_MAX }, /* syscall */
|
|
{ MIPS_INST_BREAK, ULONGEST_MAX }, /* break */
|
|
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
|
|
},
|
|
mips64_fbsd_sigframe_init
|
|
};
|
|
|
|
#define MIPS_INST_DADDIU_A0_SP_N64 (0x67a40000 \
|
|
+ N64_SIGFRAME_UCONTEXT_OFFSET)
|
|
|
|
static const struct tramp_frame mips64_fbsd_sigframe =
|
|
{
|
|
SIGTRAMP_FRAME,
|
|
MIPS_INSN32_SIZE,
|
|
{
|
|
{ MIPS_INST_DADDIU_A0_SP_N64, ULONGEST_MAX }, /* daddiu a0, sp, SIGF_UC */
|
|
{ MIPS_INST_LI_V0_SIGRETURN, ULONGEST_MAX }, /* li v0, SYS_sigreturn */
|
|
{ MIPS_INST_SYSCALL, ULONGEST_MAX }, /* syscall */
|
|
{ MIPS_INST_BREAK, ULONGEST_MAX }, /* break */
|
|
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
|
|
},
|
|
mips64_fbsd_sigframe_init
|
|
};
|
|
|
|
/* Shared library support. */
|
|
|
|
/* FreeBSD/mips uses a slightly different `struct link_map' than the
|
|
other FreeBSD platforms as it includes an additional `l_off'
|
|
member. */
|
|
|
|
static struct link_map_offsets *
|
|
mips_fbsd_ilp32_fetch_link_map_offsets (void)
|
|
{
|
|
static struct link_map_offsets lmo;
|
|
static struct link_map_offsets *lmp = NULL;
|
|
|
|
if (lmp == NULL)
|
|
{
|
|
lmp = &lmo;
|
|
|
|
lmo.r_version_offset = 0;
|
|
lmo.r_version_size = 4;
|
|
lmo.r_map_offset = 4;
|
|
lmo.r_brk_offset = 8;
|
|
lmo.r_ldsomap_offset = -1;
|
|
|
|
lmo.link_map_size = 24;
|
|
lmo.l_addr_offset = 0;
|
|
lmo.l_name_offset = 8;
|
|
lmo.l_ld_offset = 12;
|
|
lmo.l_next_offset = 16;
|
|
lmo.l_prev_offset = 20;
|
|
}
|
|
|
|
return lmp;
|
|
}
|
|
|
|
static struct link_map_offsets *
|
|
mips_fbsd_lp64_fetch_link_map_offsets (void)
|
|
{
|
|
static struct link_map_offsets lmo;
|
|
static struct link_map_offsets *lmp = NULL;
|
|
|
|
if (lmp == NULL)
|
|
{
|
|
lmp = &lmo;
|
|
|
|
lmo.r_version_offset = 0;
|
|
lmo.r_version_size = 4;
|
|
lmo.r_map_offset = 8;
|
|
lmo.r_brk_offset = 16;
|
|
lmo.r_ldsomap_offset = -1;
|
|
|
|
lmo.link_map_size = 48;
|
|
lmo.l_addr_offset = 0;
|
|
lmo.l_name_offset = 16;
|
|
lmo.l_ld_offset = 24;
|
|
lmo.l_next_offset = 32;
|
|
lmo.l_prev_offset = 40;
|
|
}
|
|
|
|
return lmp;
|
|
}
|
|
|
|
static void
|
|
mips_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
enum mips_abi abi = mips_abi (gdbarch);
|
|
|
|
/* Generic FreeBSD support. */
|
|
fbsd_init_abi (info, gdbarch);
|
|
|
|
set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
|
|
|
|
switch (abi)
|
|
{
|
|
case MIPS_ABI_O32:
|
|
tramp_frame_prepend_unwinder (gdbarch, &mips_fbsd_sigframe);
|
|
break;
|
|
case MIPS_ABI_N32:
|
|
tramp_frame_prepend_unwinder (gdbarch, &mipsn32_fbsd_sigframe);
|
|
break;
|
|
case MIPS_ABI_N64:
|
|
tramp_frame_prepend_unwinder (gdbarch, &mips64_fbsd_sigframe);
|
|
break;
|
|
}
|
|
|
|
set_gdbarch_iterate_over_regset_sections
|
|
(gdbarch, mips_fbsd_iterate_over_regset_sections);
|
|
|
|
/* FreeBSD/mips has SVR4-style shared libraries. */
|
|
set_solib_svr4_fetch_link_map_offsets
|
|
(gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ?
|
|
mips_fbsd_ilp32_fetch_link_map_offsets :
|
|
mips_fbsd_lp64_fetch_link_map_offsets));
|
|
}
|
|
|
|
void
|
|
_initialize_mips_fbsd_tdep (void)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_FREEBSD,
|
|
mips_fbsd_init_abi);
|
|
}
|