/* Xtensa GNU/Linux native support. Copyright (C) 2007-2012 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 "gdb_string.h" #include "frame.h" #include "inferior.h" #include "gdbcore.h" #include "regcache.h" #include "gdb_assert.h" #include "target.h" #include "linux-nat.h" #include <stdint.h> #include <sys/types.h> #include <sys/param.h> #include <signal.h> #include <sys/user.h> #include <sys/ioctl.h> #include "gdb_wait.h" #include <fcntl.h> #include <sys/procfs.h> #include <sys/ptrace.h> #include "gregset.h" #include "xtensa-tdep.h" /* Extended register set depends on hardware configs. Keeping these definitions separately allows to introduce hardware-specific overlays. */ #include "xtensa-xtregs.c" static int get_thread_id (ptid_t ptid) { int tid = TIDGET (ptid); if (0 == tid) tid = PIDGET (ptid); return tid; } #define GET_THREAD_ID(PTID) get_thread_id (PTID) void fill_gregset (const struct regcache *regcache, gdb_gregset_t *gregsetp, int regnum) { int i; xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp; struct gdbarch *gdbarch = get_regcache_arch (regcache); if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1) regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), ®s->pc); if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1) regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), ®s->ps); if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1) regcache_raw_collect (regcache, gdbarch_tdep (gdbarch)->wb_regnum, ®s->windowbase); if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1) regcache_raw_collect (regcache, gdbarch_tdep (gdbarch)->ws_regnum, ®s->windowstart); if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1) regcache_raw_collect (regcache, gdbarch_tdep (gdbarch)->lbeg_regnum, ®s->lbeg); if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1) regcache_raw_collect (regcache, gdbarch_tdep (gdbarch)->lend_regnum, ®s->lend); if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1) regcache_raw_collect (regcache, gdbarch_tdep (gdbarch)->lcount_regnum, ®s->lcount); if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1) regcache_raw_collect (regcache, gdbarch_tdep (gdbarch)->sar_regnum, ®s->sar); if (regnum >=gdbarch_tdep (gdbarch)->ar_base && regnum < gdbarch_tdep (gdbarch)->ar_base + gdbarch_tdep (gdbarch)->num_aregs) regcache_raw_collect (regcache,regnum, ®s->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]); else if (regnum == -1) { for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i) regcache_raw_collect (regcache, gdbarch_tdep (gdbarch)->ar_base + i, ®s->ar[i]); } } void supply_gregset_reg (struct regcache *regcache, const gdb_gregset_t *gregsetp, int regnum) { int i; xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp; struct gdbarch *gdbarch = get_regcache_arch (regcache); if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1) regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), ®s->pc); if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1) regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), ®s->ps); if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1) regcache_raw_supply (regcache, gdbarch_tdep (gdbarch)->wb_regnum, ®s->windowbase); if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1) regcache_raw_supply (regcache, gdbarch_tdep (gdbarch)->ws_regnum, ®s->windowstart); if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1) regcache_raw_supply (regcache, gdbarch_tdep (gdbarch)->lbeg_regnum, ®s->lbeg); if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1) regcache_raw_supply (regcache, gdbarch_tdep (gdbarch)->lend_regnum, ®s->lend); if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1) regcache_raw_supply (regcache, gdbarch_tdep (gdbarch)->lcount_regnum, ®s->lcount); if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1) regcache_raw_supply (regcache, gdbarch_tdep (gdbarch)->sar_regnum, ®s->sar); if (regnum >=gdbarch_tdep (gdbarch)->ar_base && regnum < gdbarch_tdep (gdbarch)->ar_base + gdbarch_tdep (gdbarch)->num_aregs) regcache_raw_supply (regcache,regnum, ®s->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]); else if (regnum == -1) { for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i) regcache_raw_supply (regcache, gdbarch_tdep (gdbarch)->ar_base + i, ®s->ar[i]); } } void supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) { supply_gregset_reg (regcache, gregsetp, -1); } void fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregsetp, int regnum) { return; } void supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) { return; } /* Fetch greg-register(s) from process/thread TID and store value(s) in GDB's register array. */ static void fetch_gregs (struct regcache *regcache, int regnum) { int tid = GET_THREAD_ID (inferior_ptid); const gdb_gregset_t regs; int areg; if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) { perror_with_name (_("Couldn't get registers")); return; } supply_gregset_reg (regcache, ®s, regnum); } /* Store greg-register(s) in GDB's register array into the process/thread specified by TID. */ static void store_gregs (struct regcache *regcache, int regnum) { int tid = GET_THREAD_ID (inferior_ptid); gdb_gregset_t regs; int areg; if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) { perror_with_name (_("Couldn't get registers")); return; } fill_gregset (regcache, ®s, regnum); if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) { perror_with_name (_("Couldn't write registers")); return; } } static int xtreg_lo; static int xtreg_high; /* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE interface provides special requests for this. */ static void fetch_xtregs (struct regcache *regcache, int regnum) { int tid = GET_THREAD_ID (inferior_ptid); const xtensa_regtable_t *ptr; char xtregs [XTENSA_ELF_XTREG_SIZE]; if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0) perror_with_name (_("Couldn't get extended registers")); for (ptr = xtensa_regmap_table; ptr->name; ptr++) if (regnum == ptr->gdb_regnum || regnum == -1) regcache_raw_supply (regcache, ptr->gdb_regnum, xtregs + ptr->ptrace_offset); } static void store_xtregs (struct regcache *regcache, int regnum) { int tid = GET_THREAD_ID (inferior_ptid); const xtensa_regtable_t *ptr; char xtregs [XTENSA_ELF_XTREG_SIZE]; if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0) perror_with_name (_("Couldn't get extended registers")); for (ptr = xtensa_regmap_table; ptr->name; ptr++) if (regnum == ptr->gdb_regnum || regnum == -1) regcache_raw_collect (regcache, ptr->gdb_regnum, xtregs + ptr->ptrace_offset); if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0) perror_with_name (_("Couldn't write extended registers")); } void xtensa_linux_fetch_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { if (regnum == -1) { fetch_gregs (regcache, regnum); fetch_xtregs (regcache, regnum); } else if ((regnum < xtreg_lo) || (regnum > xtreg_high)) fetch_gregs (regcache, regnum); else fetch_xtregs (regcache, regnum); } void xtensa_linux_store_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { if (regnum == -1) { store_gregs (regcache, regnum); store_xtregs (regcache, regnum); } else if ((regnum < xtreg_lo) || (regnum > xtreg_high)) store_gregs (regcache, regnum); else store_xtregs (regcache, regnum); } void _initialize_xtensa_linux_nat (void); void _initialize_xtensa_linux_nat (void) { struct target_ops *t; const xtensa_regtable_t *ptr; /* Calculate the number range for extended registers. */ xtreg_lo = 1000000000; xtreg_high = -1; for (ptr = xtensa_regmap_table; ptr->name; ptr++) { if (ptr->gdb_regnum < xtreg_lo) xtreg_lo = ptr->gdb_regnum; if (ptr->gdb_regnum > xtreg_high) xtreg_high = ptr->gdb_regnum; } /* Fill in the generic GNU/Linux methods. */ t = linux_target (); /* Add our register access methods. */ t->to_fetch_registers = xtensa_linux_fetch_inferior_registers; t->to_store_registers = xtensa_linux_store_inferior_registers; linux_nat_add_target (t); }