| /* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB. |
| Copyright 2007, 2008 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 "server.h" |
| #include "linux-low.h" |
| |
| #include <sys/ptrace.h> |
| #include <xtensa-config.h> |
| |
| #include "xtensa-xtregs.c" |
| |
| enum regnum { |
| R_PC=0, R_PS, |
| R_LBEG, R_LEND, R_LCOUNT, |
| R_SAR, |
| R_WS, R_WB, |
| R_A0 = 64 |
| }; |
| |
| static void |
| xtensa_fill_gregset (void *buf) |
| { |
| elf_greg_t* rset = (elf_greg_t*)buf; |
| int ar0_regnum; |
| char *ptr; |
| int i; |
| |
| /* Take care of AR registers. */ |
| |
| ar0_regnum = find_regno ("ar0"); |
| ptr = (char*)&rset[R_A0]; |
| |
| for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++) |
| { |
| collect_register (i, ptr); |
| ptr += register_size(i); |
| } |
| |
| /* Loop registers, if hardware has it. */ |
| |
| #if XCHAL_HAVE_LOOP |
| collect_register_by_name ("lbeg", (char*)&rset[R_LBEG]); |
| collect_register_by_name ("lend", (char*)&rset[R_LEND]); |
| collect_register_by_name ("lcount", (char*)&rset[R_LCOUNT]); |
| #endif |
| |
| collect_register_by_name ("sar", (char*)&rset[R_SAR]); |
| collect_register_by_name ("pc", (char*)&rset[R_PC]); |
| collect_register_by_name ("ps", (char*)&rset[R_PS]); |
| collect_register_by_name ("windowbase", (char*)&rset[R_WB]); |
| collect_register_by_name ("windowstart", (char*)&rset[R_WS]); |
| } |
| |
| static void |
| xtensa_store_gregset (const void *buf) |
| { |
| const elf_greg_t* rset = (const elf_greg_t*)buf; |
| int ar0_regnum; |
| char *ptr; |
| int i; |
| |
| /* Take care of AR registers. */ |
| |
| ar0_regnum = find_regno ("ar0"); |
| ptr = (char *)&rset[R_A0]; |
| |
| for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++) |
| { |
| supply_register (i, ptr); |
| ptr += register_size(i); |
| } |
| |
| /* Loop registers, if hardware has it. */ |
| |
| #if XCHAL_HAVE_LOOP |
| supply_register_by_name ("lbeg", (char*)&rset[R_LBEG]); |
| supply_register_by_name ("lend", (char*)&rset[R_LEND]); |
| supply_register_by_name ("lcount", (char*)&rset[R_LCOUNT]); |
| #endif |
| |
| supply_register_by_name ("sar", (char*)&rset[R_SAR]); |
| supply_register_by_name ("pc", (char*)&rset[R_PC]); |
| supply_register_by_name ("ps", (char*)&rset[R_PS]); |
| supply_register_by_name ("windowbase", (char*)&rset[R_WB]); |
| supply_register_by_name ("windowstart", (char*)&rset[R_WS]); |
| } |
| |
| /* Xtensa GNU/Linux PTRACE interface includes extended register set. */ |
| |
| static void |
| xtensa_fill_xtregset (void *buf) |
| { |
| const xtensa_regtable_t *ptr; |
| |
| for (ptr = xtensa_regmap_table; ptr->name; ptr++) |
| { |
| collect_register_by_name (ptr->name, |
| (char*)buf + ptr->ptrace_offset); |
| } |
| } |
| |
| static void |
| xtensa_store_xtregset (const void *buf) |
| { |
| const xtensa_regtable_t *ptr; |
| |
| for (ptr = xtensa_regmap_table; ptr->name; ptr++) |
| { |
| supply_register_by_name (ptr->name, |
| (char*)buf + ptr->ptrace_offset); |
| } |
| } |
| |
| struct regset_info target_regsets[] = { |
| { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), |
| GENERAL_REGS, |
| xtensa_fill_gregset, xtensa_store_gregset }, |
| { PTRACE_GETXTREGS, PTRACE_SETXTREGS, XTENSA_ELF_XTREG_SIZE, |
| EXTENDED_REGS, |
| xtensa_fill_xtregset, xtensa_store_xtregset }, |
| { 0, 0, -1, -1, NULL, NULL } |
| }; |
| |
| #if XCHAL_HAVE_BE |
| #define XTENSA_BREAKPOINT {0xd2,0x0f} |
| #else |
| #define XTENSA_BREAKPOINT {0x2d,0xf0} |
| #endif |
| |
| static const unsigned char xtensa_breakpoint[] = XTENSA_BREAKPOINT; |
| #define xtensa_breakpoint_len 2 |
| |
| static CORE_ADDR |
| xtensa_get_pc (void) |
| { |
| unsigned long pc; |
| |
| collect_register_by_name ("pc", &pc); |
| return pc; |
| } |
| |
| static void |
| xtensa_set_pc (CORE_ADDR pc) |
| { |
| unsigned long newpc = pc; |
| supply_register_by_name ("pc", &newpc); |
| } |
| |
| static int |
| xtensa_breakpoint_at (CORE_ADDR where) |
| { |
| unsigned long insn; |
| |
| (*the_target->read_memory) (where, (unsigned char *) &insn, |
| xtensa_breakpoint_len); |
| return memcmp((char *)&insn, xtensa_breakpoint, xtensa_breakpoint_len) == 0; |
| } |
| |
| struct linux_target_ops the_low_target = { |
| 0, |
| 0, |
| 0, |
| 0, |
| xtensa_get_pc, |
| xtensa_set_pc, |
| xtensa_breakpoint, |
| xtensa_breakpoint_len, |
| NULL, |
| 0, |
| xtensa_breakpoint_at, |
| }; |