| /* Native-dependent code for OpenBSD/powerpc. |
| |
| Copyright 2004, 2005 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 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "gdbcore.h" |
| #include "inferior.h" |
| #include "regcache.h" |
| |
| #include <stddef.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 "ppcobsd-tdep.h" |
| #include "inf-ptrace.h" |
| #include "bsd-kvm.h" |
| |
| /* OpenBSD/powerpc doesn't have PT_GETFPREGS/PT_SETFPREGS like |
| NetBSD/powerpc and FreeBSD/powerpc. */ |
| |
| /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
| for all registers. */ |
| |
| static void |
| ppcobsd_fetch_registers (int regnum) |
| { |
| struct reg regs; |
| |
| if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), |
| (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| perror_with_name (_("Couldn't get registers")); |
| |
| ppcobsd_supply_gregset (&ppcobsd_gregset, current_regcache, -1, |
| ®s, sizeof regs); |
| } |
| |
| /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
| this for all registers. */ |
| |
| static void |
| ppcobsd_store_registers (int regnum) |
| { |
| struct reg regs; |
| |
| if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), |
| (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| perror_with_name (_("Couldn't get registers")); |
| |
| ppcobsd_collect_gregset (&ppcobsd_gregset, current_regcache, |
| regnum, ®s, sizeof regs); |
| |
| if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), |
| (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| perror_with_name (_("Couldn't write registers")); |
| } |
| |
| |
| static int |
| ppcobsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); |
| 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, SP_REGNUM, &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, PC_REGNUM, &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; |
| add_target (t); |
| |
| /* General-purpose registers. */ |
| ppcobsd_reg_offsets.r0_offset = offsetof (struct reg, gpr); |
| 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; |
| |
| /* 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); |
| } |