| /* Xtensa GNU/Linux native support. |
| |
| Copyright (C) 2007-2021 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 (); |
| |
| 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 == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1) |
| regcache->raw_collect (gdbarch_tdep (gdbarch)->wb_regnum, |
| ®s->windowbase); |
| if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1) |
| regcache->raw_collect (gdbarch_tdep (gdbarch)->ws_regnum, |
| ®s->windowstart); |
| if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1) |
| regcache->raw_collect (gdbarch_tdep (gdbarch)->lbeg_regnum, |
| ®s->lbeg); |
| if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1) |
| regcache->raw_collect (gdbarch_tdep (gdbarch)->lend_regnum, |
| ®s->lend); |
| if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1) |
| regcache->raw_collect (gdbarch_tdep (gdbarch)->lcount_regnum, |
| ®s->lcount); |
| if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1) |
| regcache->raw_collect (gdbarch_tdep (gdbarch)->sar_regnum, |
| ®s->sar); |
| if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1) |
| regcache->raw_collect (gdbarch_tdep (gdbarch)->threadptr_regnum, |
| ®s->threadptr); |
| if (regnum >=gdbarch_tdep (gdbarch)->ar_base |
| && regnum < gdbarch_tdep (gdbarch)->ar_base |
| + gdbarch_tdep (gdbarch)->num_aregs) |
| regcache->raw_collect (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 (gdbarch_tdep (gdbarch)->ar_base + i, |
| ®s->ar[i]); |
| } |
| if (regnum >= gdbarch_tdep (gdbarch)->a0_base |
| && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS) |
| regcache->raw_collect (regnum, |
| ®s->ar[(4 * regs->windowbase + regnum |
| - gdbarch_tdep (gdbarch)->a0_base) |
| % gdbarch_tdep (gdbarch)->num_aregs]); |
| else if (regnum == -1) |
| { |
| for (i = 0; i < C0_NREGS; ++i) |
| regcache->raw_collect (gdbarch_tdep (gdbarch)->a0_base + i, |
| (®s->ar[(4 * regs->windowbase + i) |
| % gdbarch_tdep (gdbarch)->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 (); |
| |
| 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 == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1) |
| regcache->raw_supply (gdbarch_tdep (gdbarch)->wb_regnum, |
| ®s->windowbase); |
| if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1) |
| regcache->raw_supply (gdbarch_tdep (gdbarch)->ws_regnum, |
| ®s->windowstart); |
| if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1) |
| regcache->raw_supply (gdbarch_tdep (gdbarch)->lbeg_regnum, |
| ®s->lbeg); |
| if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1) |
| regcache->raw_supply (gdbarch_tdep (gdbarch)->lend_regnum, |
| ®s->lend); |
| if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1) |
| regcache->raw_supply (gdbarch_tdep (gdbarch)->lcount_regnum, |
| ®s->lcount); |
| if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1) |
| regcache->raw_supply (gdbarch_tdep (gdbarch)->sar_regnum, |
| ®s->sar); |
| if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1) |
| regcache->raw_supply (gdbarch_tdep (gdbarch)->threadptr_regnum, |
| ®s->threadptr); |
| if (regnum >=gdbarch_tdep (gdbarch)->ar_base |
| && regnum < gdbarch_tdep (gdbarch)->ar_base |
| + gdbarch_tdep (gdbarch)->num_aregs) |
| regcache->raw_supply (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 (gdbarch_tdep (gdbarch)->ar_base + i, |
| ®s->ar[i]); |
| } |
| if (regnum >= gdbarch_tdep (gdbarch)->a0_base |
| && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS) |
| regcache->raw_supply (regnum, |
| ®s->ar[(4 * regs->windowbase + regnum |
| - gdbarch_tdep (gdbarch)->a0_base) |
| % gdbarch_tdep (gdbarch)->num_aregs]); |
| else if (regnum == -1) |
| { |
| for (i = 0; i < C0_NREGS; ++i) |
| regcache->raw_supply (gdbarch_tdep (gdbarch)->a0_base + i, |
| ®s->ar[(4 * regs->windowbase + i) |
| % gdbarch_tdep (gdbarch)->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; |
| 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 = regcache->ptid ().lwp (); |
| 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 = 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); |
| } |