diff options
Diffstat (limited to 'gdb/ppc-obsd-nat.c')
| -rw-r--r-- | gdb/ppc-obsd-nat.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/gdb/ppc-obsd-nat.c b/gdb/ppc-obsd-nat.c new file mode 100644 index 0000000..eb39e7c --- /dev/null +++ b/gdb/ppc-obsd-nat.c @@ -0,0 +1,231 @@ +/* Native-dependent code for OpenBSD/powerpc. + + Copyright (C) 2004-2016 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" + +/* 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) +{ + struct gdbarch_tdep *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. */ + +static void +ppcobsd_fetch_registers (struct target_ops *ops, + struct regcache *regcache, int regnum) +{ + struct reg regs; + + if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), + (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 (get_regcache_arch (regcache), regnum)) + { + struct fpreg fpregs; + + if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid), + (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. */ + +static void +ppcobsd_store_registers (struct target_ops *ops, + struct regcache *regcache, int regnum) +{ + struct reg regs; + + if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), + (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, ptid_get_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) ®s, 0) == -1) + perror_with_name (_("Couldn't write registers")); + +#ifdef PT_GETFPREGS + if (regnum == -1 + || getfpregs_supplies (get_regcache_arch (regcache), regnum)) + { + struct fpreg fpregs; + + if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid), + (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, ptid_get_pid (inferior_ptid), + (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 = get_regcache_arch (regcache); + struct gdbarch_tdep *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 (regcache, gdbarch_sp_regnum (gdbarch), &sf.sp); + regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr); + regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2); + for (i = 0, regnum = tdep->ppc_gp0_regnum + 13; i < 19; i++, regnum++) + regcache_raw_supply (regcache, regnum, &sf.fixreg[i]); + + read_memory (sf.sp, (gdb_byte *)&cf, sizeof cf); + regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &cf.lr); + regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30); + regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31); + + return 1; +} + + +/* Provide a prototype to silence -Wmissing-prototypes. */ +void _initialize_ppcobsd_nat (void); + +void +_initialize_ppcobsd_nat (void) +{ + struct target_ops *t; + + /* Add in local overrides. */ + t = inf_ptrace_target (); + t->to_fetch_registers = ppcobsd_fetch_registers; + t->to_store_registers = ppcobsd_store_registers; + obsd_add_target (t); + + /* 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 + + /* AltiVec registers. */ + ppcobsd_reg_offsets.vr0_offset = offsetof (struct vreg, vreg); + ppcobsd_reg_offsets.vscr_offset = offsetof (struct vreg, vscr); + ppcobsd_reg_offsets.vrsave_offset = offsetof (struct vreg, vrsave); + + /* Support debugging kernel virtual memory images. */ + bsd_kvm_add_target (ppcobsd_supply_pcb); +} |