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- /* Native-dependent code for OpenBSD/powerpc.
- Copyright (C) 2004-2022 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 "gdbcore.h"
- #include "inferior.h"
- #include "regcache.h"
- #include <sys/types.h>
- #include <sys/ptrace.h>
- #include <sys/signal.h>
- #include <machine/frame.h>
- #include <machine/pcb.h>
- #include <machine/reg.h>
- #include "ppc-tdep.h"
- #include "ppc-obsd-tdep.h"
- #include "inf-ptrace.h"
- #include "obsd-nat.h"
- #include "bsd-kvm.h"
- struct ppc_obsd_nat_target final : public obsd_nat_target
- {
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- };
- static ppc_obsd_nat_target the_ppc_obsd_nat_target;
- /* OpenBSD/powerpc didn't have PT_GETFPREGS/PT_SETFPREGS until release
- 4.0. On older releases the floating-point registers are handled by
- PT_GETREGS/PT_SETREGS, but fpscr wasn't available.. */
- #ifdef PT_GETFPREGS
- /* Returns true if PT_GETFPREGS fetches this register. */
- static int
- getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
- {
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
- point registers. Traditionally, GDB's register set has still
- listed the floating point registers for such machines, so this
- code is harmless. However, the new E500 port actually omits the
- floating point registers entirely from the register set --- they
- don't even have register numbers assigned to them.
- It's not clear to me how best to update this code, so this assert
- will alert the first person to encounter the NetBSD/E500
- combination to the problem. */
- gdb_assert (ppc_floating_point_unit_p (gdbarch));
- return ((regnum >= tdep->ppc_fp0_regnum
- && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs)
- || regnum == tdep->ppc_fpscr_regnum);
- }
- #endif /* PT_GETFPREGS */
- /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
- for all registers. */
- void
- ppc_obsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
- {
- struct reg regs;
- pid_t pid = regcache->ptid ().pid ();
- if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
- perror_with_name (_("Couldn't get registers"));
- ppc_supply_gregset (&ppcobsd_gregset, regcache, -1,
- ®s, sizeof regs);
- #ifndef PT_GETFPREGS
- ppc_supply_fpregset (&ppcobsd_gregset, regcache, -1,
- ®s, sizeof regs);
- #endif
- #ifdef PT_GETFPREGS
- if (regnum == -1
- || getfpregs_supplies (regcache->arch (), regnum))
- {
- struct fpreg fpregs;
- if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
- perror_with_name (_("Couldn't get floating point status"));
- ppc_supply_fpregset (&ppcobsd_fpregset, regcache, -1,
- &fpregs, sizeof fpregs);
- }
- #endif
- }
- /* Store register REGNUM back into the inferior. If REGNUM is -1, do
- this for all registers. */
- void
- ppc_obsd_nat_target::store_registers (struct regcache *regcache, int regnum)
- {
- struct reg regs;
- pid_t pid = regcache->ptid ().pid ();
- if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
- perror_with_name (_("Couldn't get registers"));
- ppc_collect_gregset (&ppcobsd_gregset, regcache,
- regnum, ®s, sizeof regs);
- #ifndef PT_GETFPREGS
- ppc_collect_fpregset (&ppcobsd_gregset, regcache,
- regnum, ®s, sizeof regs);
- #endif
- if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
- perror_with_name (_("Couldn't write registers"));
- #ifdef PT_GETFPREGS
- if (regnum == -1
- || getfpregs_supplies (regcache->arch (), regnum))
- {
- struct fpreg fpregs;
- if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
- perror_with_name (_("Couldn't get floating point status"));
- ppc_collect_fpregset (&ppcobsd_fpregset, regcache,
- regnum, &fpregs, sizeof fpregs);
- if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
- perror_with_name (_("Couldn't write floating point status"));
- }
- #endif
- }
- static int
- ppcobsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- struct switchframe sf;
- struct callframe cf;
- int i, regnum;
- /* The following is true for OpenBSD 3.7:
- The pcb contains %r1 (the stack pointer) at the point of the
- context switch in cpu_switch(). At that point we have a stack
- frame as described by `struct switchframe', and below that a call
- frame as described by `struct callframe'. From this information
- we reconstruct the register state as it would look when we are in
- cpu_switch(). */
- /* The stack pointer shouldn't be zero. */
- if (pcb->pcb_sp == 0)
- return 0;
- read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf);
- regcache->raw_supply (gdbarch_sp_regnum (gdbarch), &sf.sp);
- regcache->raw_supply (tdep->ppc_cr_regnum, &sf.cr);
- regcache->raw_supply (tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
- for (i = 0, regnum = tdep->ppc_gp0_regnum + 13; i < 19; i++, regnum++)
- regcache->raw_supply (regnum, &sf.fixreg[i]);
- read_memory (sf.sp, (gdb_byte *)&cf, sizeof cf);
- regcache->raw_supply (gdbarch_pc_regnum (gdbarch), &cf.lr);
- regcache->raw_supply (tdep->ppc_gp0_regnum + 30, &cf.r30);
- regcache->raw_supply (tdep->ppc_gp0_regnum + 31, &cf.r31);
- return 1;
- }
- void _initialize_ppcobsd_nat ();
- void
- _initialize_ppcobsd_nat ()
- {
- add_inf_child_target (&the_ppc_obsd_nat_target);
- /* General-purpose registers. */
- ppcobsd_reg_offsets.r0_offset = offsetof (struct reg, gpr);
- ppcobsd_reg_offsets.gpr_size = 4;
- ppcobsd_reg_offsets.xr_size = 4;
- ppcobsd_reg_offsets.pc_offset = offsetof (struct reg, pc);
- ppcobsd_reg_offsets.ps_offset = offsetof (struct reg, ps);
- ppcobsd_reg_offsets.cr_offset = offsetof (struct reg, cnd);
- ppcobsd_reg_offsets.lr_offset = offsetof (struct reg, lr);
- ppcobsd_reg_offsets.ctr_offset = offsetof (struct reg, cnt);
- ppcobsd_reg_offsets.xer_offset = offsetof (struct reg, xer);
- ppcobsd_reg_offsets.mq_offset = offsetof (struct reg, mq);
- /* Floating-point registers. */
- ppcobsd_reg_offsets.f0_offset = offsetof (struct reg, fpr);
- ppcobsd_reg_offsets.fpscr_offset = -1;
- #ifdef PT_GETFPREGS
- ppcobsd_fpreg_offsets.f0_offset = offsetof (struct fpreg, fpr);
- ppcobsd_fpreg_offsets.fpscr_offset = offsetof (struct fpreg, fpscr);
- ppcobsd_fpreg_offsets.fpscr_size = 4;
- #endif
- /* Support debugging kernel virtual memory images. */
- bsd_kvm_add_target (ppcobsd_supply_pcb);
- }
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