/* Xtensa GNU/Linux native support. Copyright (C) 2007-2022 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 "frame.h" #include "inferior.h" #include "gdbcore.h" #include "regcache.h" #include "target.h" #include "linux-nat.h" #include <sys/types.h> #include <signal.h> #include <sys/user.h> #include <sys/ioctl.h> #include "gdbsupport/gdb_wait.h" #include <fcntl.h> #include <sys/procfs.h> #include "nat/gdb_ptrace.h" #include <asm/ptrace.h> #include "gregset.h" #include "xtensa-tdep.h" /* Defines ps_err_e, struct ps_prochandle. */ #include "gdb_proc_service.h" /* Extended register set depends on hardware configs. Keeping these definitions separately allows to introduce hardware-specific overlays. */ #include "xtensa-xtregs.c" class xtensa_linux_nat_target final : public linux_nat_target { public: /* Add our register access methods. */ void fetch_registers (struct regcache *, int) override; void store_registers (struct regcache *, int) override; }; static xtensa_linux_nat_target the_xtensa_linux_nat_target; 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 = regcache->arch (); xtensa_gdbarch_tdep *tdep = (xtensa_gdbarch_tdep *) gdbarch_tdep (gdbarch); if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1) regcache->raw_collect (gdbarch_pc_regnum (gdbarch), ®s->pc); if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1) regcache->raw_collect (gdbarch_ps_regnum (gdbarch), ®s->ps); if (regnum == tdep->wb_regnum || regnum == -1) regcache->raw_collect (tdep->wb_regnum, ®s->windowbase); if (regnum == tdep->ws_regnum || regnum == -1) regcache->raw_collect (tdep->ws_regnum, ®s->windowstart); if (regnum == tdep->lbeg_regnum || regnum == -1) regcache->raw_collect (tdep->lbeg_regnum, ®s->lbeg); if (regnum == tdep->lend_regnum || regnum == -1) regcache->raw_collect (tdep->lend_regnum, ®s->lend); if (regnum == tdep->lcount_regnum || regnum == -1) regcache->raw_collect (tdep->lcount_regnum, ®s->lcount); if (regnum == tdep->sar_regnum || regnum == -1) regcache->raw_collect (tdep->sar_regnum, ®s->sar); if (regnum == tdep->threadptr_regnum || regnum == -1) regcache->raw_collect (tdep->threadptr_regnum, ®s->threadptr); if (regnum >=tdep->ar_base && regnum < tdep->ar_base + tdep->num_aregs) regcache->raw_collect (regnum, ®s->ar[regnum - tdep->ar_base]); else if (regnum == -1) { for (i = 0; i < tdep->num_aregs; ++i) regcache->raw_collect (tdep->ar_base + i, ®s->ar[i]); } if (regnum >= tdep->a0_base && regnum < tdep->a0_base + C0_NREGS) regcache->raw_collect (regnum, ®s->ar[(4 * regs->windowbase + regnum - tdep->a0_base) % tdep->num_aregs]); else if (regnum == -1) { for (i = 0; i < C0_NREGS; ++i) regcache->raw_collect (tdep->a0_base + i, (®s->ar[(4 * regs->windowbase + i) % tdep->num_aregs])); } } static 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 = regcache->arch (); xtensa_gdbarch_tdep *tdep = (xtensa_gdbarch_tdep *) gdbarch_tdep (gdbarch); if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1) regcache->raw_supply (gdbarch_pc_regnum (gdbarch), ®s->pc); if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1) regcache->raw_supply (gdbarch_ps_regnum (gdbarch), ®s->ps); if (regnum == tdep->wb_regnum || regnum == -1) regcache->raw_supply (tdep->wb_regnum, ®s->windowbase); if (regnum == tdep->ws_regnum || regnum == -1) regcache->raw_supply (tdep->ws_regnum, ®s->windowstart); if (regnum == tdep->lbeg_regnum || regnum == -1) regcache->raw_supply (tdep->lbeg_regnum, ®s->lbeg); if (regnum == tdep->lend_regnum || regnum == -1) regcache->raw_supply (tdep->lend_regnum, ®s->lend); if (regnum == tdep->lcount_regnum || regnum == -1) regcache->raw_supply (tdep->lcount_regnum, ®s->lcount); if (regnum == tdep->sar_regnum || regnum == -1) regcache->raw_supply (tdep->sar_regnum, ®s->sar); if (regnum == tdep->threadptr_regnum || regnum == -1) regcache->raw_supply (tdep->threadptr_regnum, ®s->threadptr); if (regnum >=tdep->ar_base && regnum < tdep->ar_base + tdep->num_aregs) regcache->raw_supply (regnum, ®s->ar[regnum - tdep->ar_base]); else if (regnum == -1) { for (i = 0; i < tdep->num_aregs; ++i) regcache->raw_supply (tdep->ar_base + i, ®s->ar[i]); } if (regnum >= tdep->a0_base && regnum < tdep->a0_base + C0_NREGS) regcache->raw_supply (regnum, ®s->ar[(4 * regs->windowbase + regnum - tdep->a0_base) % tdep->num_aregs]); else if (regnum == -1) { for (i = 0; i < C0_NREGS; ++i) regcache->raw_supply (tdep->a0_base + i, ®s->ar[(4 * regs->windowbase + i) % tdep->num_aregs]); } } 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 = regcache->ptid ().lwp (); gdb_gregset_t regs; 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 = regcache->ptid ().lwp (); gdb_gregset_t regs; 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 = regcache->ptid ().lwp (); 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 (ptr->gdb_regnum, xtregs + ptr->ptrace_offset); } static void store_xtregs (struct regcache *regcache, int regnum) { int tid = regcache->ptid ().lwp (); 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 (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_nat_target::fetch_registers (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_nat_target::store_registers (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); } /* Called by libthread_db. */ ps_err_e ps_get_thread_area (struct ps_prochandle *ph, lwpid_t lwpid, int idx, void **base) { xtensa_elf_gregset_t regs; if (ptrace (PTRACE_GETREGS, lwpid, NULL, ®s) != 0) return PS_ERR; /* IDX is the bias from the thread pointer to the beginning of the thread descriptor. It has to be subtracted due to implementation quirks in libthread_db. */ *base = (void *) ((char *) regs.threadptr - idx); return PS_OK; } void _initialize_xtensa_linux_nat (); void _initialize_xtensa_linux_nat () { 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; } linux_target = &the_xtensa_linux_nat_target; add_inf_child_target (&the_xtensa_linux_nat_target); }