123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210 |
- /* Native-dependent code for GNU/Linux OpenRISC.
- Copyright (C) 2021-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "regcache.h"
- #include "gregset.h"
- #include "linux-nat.h"
- #include "or1k-tdep.h"
- #include "or1k-linux-tdep.h"
- #include "inferior.h"
- #include "elf/common.h"
- #include <sys/ptrace.h>
- /* OpenRISC Linux native additions to the default linux support. */
- class or1k_linux_nat_target final : public linux_nat_target
- {
- public:
- /* Add our register access methods. */
- void fetch_registers (struct regcache *regcache, int regnum) override;
- void store_registers (struct regcache *regcache, int regnum) override;
- /* Read suitable target description. */
- const struct target_desc *read_description () override;
- };
- static or1k_linux_nat_target the_or1k_linux_nat_target;
- /* Copy general purpose register REGNUM (or all gp regs if REGNUM == -1)
- from regset GREGS into REGCACHE. */
- static void
- supply_gregset_regnum (struct regcache *regcache, const prgregset_t *gregs,
- int regnum)
- {
- int i;
- const elf_greg_t *regp = *gregs;
- /* Access all registers */
- if (regnum == -1)
- {
- /* We fill the general purpose registers. */
- for (i = OR1K_ZERO_REGNUM + 1; i < OR1K_MAX_GPR_REGS; i++)
- regcache->raw_supply (i, regp + i);
- /* Supply OR1K_NPC_REGNUM from index 32. */
- regcache->raw_supply (OR1K_NPC_REGNUM, regp + 32);
- /* Fill the inaccessible zero register with zero. */
- regcache->raw_supply_zeroed (0);
- }
- else if (regnum == OR1K_ZERO_REGNUM)
- regcache->raw_supply_zeroed (0);
- else if (regnum == OR1K_NPC_REGNUM)
- regcache->raw_supply (OR1K_NPC_REGNUM, regp + 32);
- else if (regnum > OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS)
- regcache->raw_supply (regnum, regp + regnum);
- }
- /* Copy all general purpose registers from regset GREGS into REGCACHE. */
- void
- supply_gregset (struct regcache *regcache, const prgregset_t *gregs)
- {
- supply_gregset_regnum (regcache, gregs, -1);
- }
- /* Copy general purpose register REGNUM (or all gp regs if REGNUM == -1)
- from REGCACHE into regset GREGS. */
- void
- fill_gregset (const struct regcache *regcache, prgregset_t *gregs, int regnum)
- {
- elf_greg_t *regp = *gregs;
- if (regnum == -1)
- {
- /* We fill the general purpose registers. */
- for (int i = OR1K_ZERO_REGNUM + 1; i < OR1K_MAX_GPR_REGS; i++)
- regcache->raw_collect (i, regp + i);
- regcache->raw_collect (OR1K_NPC_REGNUM, regp + 32);
- }
- else if (regnum == OR1K_ZERO_REGNUM)
- /* Nothing to do here. */
- ;
- else if (regnum > OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS)
- regcache->raw_collect (regnum, regp + regnum);
- else if (regnum == OR1K_NPC_REGNUM)
- regcache->raw_collect (OR1K_NPC_REGNUM, regp + 32);
- }
- /* Transfering floating-point registers between GDB, inferiors and cores.
- Since OpenRISC floating-point registers are the same as GPRs these do
- nothing. */
- void
- supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)
- {
- }
- void
- fill_fpregset (const struct regcache *regcache,
- gdb_fpregset_t *fpregs, int regno)
- {
- }
- /* Return a target description for the current target. */
- const struct target_desc *
- or1k_linux_nat_target::read_description ()
- {
- return tdesc_or1k_linux;
- }
- /* Fetch REGNUM (or all registers if REGNUM == -1) from the target
- into REGCACHE using PTRACE_GETREGSET. */
- void
- or1k_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
- {
- int tid;
- tid = get_ptrace_pid (regcache->ptid());
- if ((regnum >= OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS)
- || (regnum == OR1K_NPC_REGNUM)
- || (regnum == -1))
- {
- struct iovec iov;
- elf_gregset_t regs;
- iov.iov_base = ®s;
- iov.iov_len = sizeof (regs);
- if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS,
- (PTRACE_TYPE_ARG3) &iov) == -1)
- perror_with_name (_("Couldn't get registers"));
- else
- supply_gregset_regnum (regcache, ®s, regnum);
- }
- /* Access to other SPRs has potential security issues, don't support them for
- now. */
- }
- /* Store REGNUM (or all registers if REGNUM == -1) to the target
- from REGCACHE using PTRACE_SETREGSET. */
- void
- or1k_linux_nat_target::store_registers (struct regcache *regcache, int regnum)
- {
- int tid;
- tid = get_ptrace_pid (regcache->ptid ());
- if ((regnum >= OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS)
- || (regnum == OR1K_NPC_REGNUM)
- || (regnum == -1))
- {
- struct iovec iov;
- elf_gregset_t regs;
- iov.iov_base = ®s;
- iov.iov_len = sizeof (regs);
- if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS,
- (PTRACE_TYPE_ARG3) &iov) == -1)
- perror_with_name (_("Couldn't get registers"));
- else
- {
- fill_gregset (regcache, ®s, regnum);
- if (ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS,
- (PTRACE_TYPE_ARG3) &iov) == -1)
- perror_with_name (_("Couldn't set registers"));
- }
- }
- /* Access to SPRs has potential security issues, don't support them for
- now. */
- }
- /* Initialize OpenRISC Linux native support. */
- void _initialize_or1k_linux_nat ();
- void
- _initialize_or1k_linux_nat ()
- {
- /* Register the target. */
- linux_target = &the_or1k_linux_nat_target;
- add_inf_child_target (&the_or1k_linux_nat_target);
- }
|