/* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB.
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/* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB.
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Copyright 2007, 2008 Free Software Foundation, Inc.
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Copyright 2007, 2008 Free Software Foundation, Inc.
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This file is part of GDB.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "server.h"
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#include "linux-low.h"
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#include "linux-low.h"
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#include <sys/ptrace.h>
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#include <sys/ptrace.h>
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#include <xtensa-config.h>
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#include <xtensa-config.h>
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#include "xtensa-xtregs.c"
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#include "xtensa-xtregs.c"
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enum regnum {
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enum regnum {
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R_PC=0, R_PS,
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R_PC=0, R_PS,
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R_LBEG, R_LEND, R_LCOUNT,
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R_LBEG, R_LEND, R_LCOUNT,
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R_SAR,
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R_SAR,
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R_WS, R_WB,
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R_WS, R_WB,
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R_A0 = 64
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R_A0 = 64
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};
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};
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static void
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static void
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xtensa_fill_gregset (void *buf)
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xtensa_fill_gregset (void *buf)
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{
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{
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elf_greg_t* rset = (elf_greg_t*)buf;
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elf_greg_t* rset = (elf_greg_t*)buf;
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int ar0_regnum;
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int ar0_regnum;
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char *ptr;
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char *ptr;
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int i;
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int i;
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/* Take care of AR registers. */
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/* Take care of AR registers. */
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ar0_regnum = find_regno ("ar0");
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ar0_regnum = find_regno ("ar0");
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ptr = (char*)&rset[R_A0];
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ptr = (char*)&rset[R_A0];
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for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
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for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
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{
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{
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collect_register (i, ptr);
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collect_register (i, ptr);
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ptr += register_size(i);
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ptr += register_size(i);
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}
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}
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/* Loop registers, if hardware has it. */
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/* Loop registers, if hardware has it. */
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#if XCHAL_HAVE_LOOP
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#if XCHAL_HAVE_LOOP
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collect_register_by_name ("lbeg", (char*)&rset[R_LBEG]);
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collect_register_by_name ("lbeg", (char*)&rset[R_LBEG]);
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collect_register_by_name ("lend", (char*)&rset[R_LEND]);
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collect_register_by_name ("lend", (char*)&rset[R_LEND]);
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collect_register_by_name ("lcount", (char*)&rset[R_LCOUNT]);
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collect_register_by_name ("lcount", (char*)&rset[R_LCOUNT]);
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#endif
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#endif
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collect_register_by_name ("sar", (char*)&rset[R_SAR]);
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collect_register_by_name ("sar", (char*)&rset[R_SAR]);
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collect_register_by_name ("pc", (char*)&rset[R_PC]);
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collect_register_by_name ("pc", (char*)&rset[R_PC]);
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collect_register_by_name ("ps", (char*)&rset[R_PS]);
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collect_register_by_name ("ps", (char*)&rset[R_PS]);
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collect_register_by_name ("windowbase", (char*)&rset[R_WB]);
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collect_register_by_name ("windowbase", (char*)&rset[R_WB]);
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collect_register_by_name ("windowstart", (char*)&rset[R_WS]);
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collect_register_by_name ("windowstart", (char*)&rset[R_WS]);
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}
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}
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static void
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static void
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xtensa_store_gregset (const void *buf)
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xtensa_store_gregset (const void *buf)
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{
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{
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const elf_greg_t* rset = (const elf_greg_t*)buf;
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const elf_greg_t* rset = (const elf_greg_t*)buf;
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int ar0_regnum;
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int ar0_regnum;
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char *ptr;
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char *ptr;
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int i;
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int i;
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/* Take care of AR registers. */
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/* Take care of AR registers. */
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ar0_regnum = find_regno ("ar0");
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ar0_regnum = find_regno ("ar0");
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ptr = (char *)&rset[R_A0];
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ptr = (char *)&rset[R_A0];
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for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
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for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
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{
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{
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supply_register (i, ptr);
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supply_register (i, ptr);
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ptr += register_size(i);
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ptr += register_size(i);
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}
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}
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/* Loop registers, if hardware has it. */
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/* Loop registers, if hardware has it. */
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#if XCHAL_HAVE_LOOP
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#if XCHAL_HAVE_LOOP
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supply_register_by_name ("lbeg", (char*)&rset[R_LBEG]);
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supply_register_by_name ("lbeg", (char*)&rset[R_LBEG]);
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supply_register_by_name ("lend", (char*)&rset[R_LEND]);
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supply_register_by_name ("lend", (char*)&rset[R_LEND]);
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supply_register_by_name ("lcount", (char*)&rset[R_LCOUNT]);
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supply_register_by_name ("lcount", (char*)&rset[R_LCOUNT]);
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#endif
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#endif
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supply_register_by_name ("sar", (char*)&rset[R_SAR]);
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supply_register_by_name ("sar", (char*)&rset[R_SAR]);
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supply_register_by_name ("pc", (char*)&rset[R_PC]);
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supply_register_by_name ("pc", (char*)&rset[R_PC]);
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supply_register_by_name ("ps", (char*)&rset[R_PS]);
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supply_register_by_name ("ps", (char*)&rset[R_PS]);
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supply_register_by_name ("windowbase", (char*)&rset[R_WB]);
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supply_register_by_name ("windowbase", (char*)&rset[R_WB]);
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supply_register_by_name ("windowstart", (char*)&rset[R_WS]);
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supply_register_by_name ("windowstart", (char*)&rset[R_WS]);
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}
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}
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/* Xtensa GNU/Linux PTRACE interface includes extended register set. */
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/* Xtensa GNU/Linux PTRACE interface includes extended register set. */
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static void
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static void
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xtensa_fill_xtregset (void *buf)
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xtensa_fill_xtregset (void *buf)
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{
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{
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const xtensa_regtable_t *ptr;
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const xtensa_regtable_t *ptr;
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for (ptr = xtensa_regmap_table; ptr->name; ptr++)
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for (ptr = xtensa_regmap_table; ptr->name; ptr++)
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{
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{
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collect_register_by_name (ptr->name,
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collect_register_by_name (ptr->name,
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(char*)buf + ptr->ptrace_offset);
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(char*)buf + ptr->ptrace_offset);
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}
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}
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}
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}
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static void
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static void
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xtensa_store_xtregset (const void *buf)
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xtensa_store_xtregset (const void *buf)
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{
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{
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const xtensa_regtable_t *ptr;
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const xtensa_regtable_t *ptr;
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for (ptr = xtensa_regmap_table; ptr->name; ptr++)
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for (ptr = xtensa_regmap_table; ptr->name; ptr++)
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{
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{
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supply_register_by_name (ptr->name,
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supply_register_by_name (ptr->name,
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(char*)buf + ptr->ptrace_offset);
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(char*)buf + ptr->ptrace_offset);
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}
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}
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}
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}
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struct regset_info target_regsets[] = {
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struct regset_info target_regsets[] = {
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{ PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
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{ PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
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GENERAL_REGS,
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GENERAL_REGS,
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xtensa_fill_gregset, xtensa_store_gregset },
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xtensa_fill_gregset, xtensa_store_gregset },
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{ PTRACE_GETXTREGS, PTRACE_SETXTREGS, XTENSA_ELF_XTREG_SIZE,
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{ PTRACE_GETXTREGS, PTRACE_SETXTREGS, XTENSA_ELF_XTREG_SIZE,
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EXTENDED_REGS,
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EXTENDED_REGS,
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xtensa_fill_xtregset, xtensa_store_xtregset },
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xtensa_fill_xtregset, xtensa_store_xtregset },
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{ 0, 0, -1, -1, NULL, NULL }
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{ 0, 0, -1, -1, NULL, NULL }
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};
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};
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#if XCHAL_HAVE_BE
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#if XCHAL_HAVE_BE
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#define XTENSA_BREAKPOINT {0xd2,0x0f}
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#define XTENSA_BREAKPOINT {0xd2,0x0f}
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#else
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#else
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#define XTENSA_BREAKPOINT {0x2d,0xf0}
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#define XTENSA_BREAKPOINT {0x2d,0xf0}
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#endif
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#endif
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static const unsigned char xtensa_breakpoint[] = XTENSA_BREAKPOINT;
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static const unsigned char xtensa_breakpoint[] = XTENSA_BREAKPOINT;
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#define xtensa_breakpoint_len 2
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#define xtensa_breakpoint_len 2
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static CORE_ADDR
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static CORE_ADDR
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xtensa_get_pc (void)
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xtensa_get_pc (void)
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{
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{
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unsigned long pc;
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unsigned long pc;
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collect_register_by_name ("pc", &pc);
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collect_register_by_name ("pc", &pc);
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return pc;
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return pc;
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}
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}
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static void
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static void
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xtensa_set_pc (CORE_ADDR pc)
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xtensa_set_pc (CORE_ADDR pc)
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{
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{
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unsigned long newpc = pc;
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unsigned long newpc = pc;
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supply_register_by_name ("pc", &newpc);
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supply_register_by_name ("pc", &newpc);
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}
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}
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static int
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static int
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xtensa_breakpoint_at (CORE_ADDR where)
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xtensa_breakpoint_at (CORE_ADDR where)
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{
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{
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unsigned long insn;
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unsigned long insn;
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(*the_target->read_memory) (where, (unsigned char *) &insn,
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(*the_target->read_memory) (where, (unsigned char *) &insn,
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xtensa_breakpoint_len);
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xtensa_breakpoint_len);
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return memcmp((char *)&insn, xtensa_breakpoint, xtensa_breakpoint_len) == 0;
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return memcmp((char *)&insn, xtensa_breakpoint, xtensa_breakpoint_len) == 0;
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}
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}
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struct linux_target_ops the_low_target = {
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struct linux_target_ops the_low_target = {
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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xtensa_get_pc,
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xtensa_get_pc,
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xtensa_set_pc,
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xtensa_set_pc,
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xtensa_breakpoint,
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xtensa_breakpoint,
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xtensa_breakpoint_len,
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xtensa_breakpoint_len,
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NULL,
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NULL,
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0,
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0,
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xtensa_breakpoint_at,
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xtensa_breakpoint_at,
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};
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};
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