| /* Target-dependent code for GNU/Linux on Nios II. |
| Copyright (C) 2012-2013 Free Software Foundation, Inc. |
| Contributed by Mentor Graphics, 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 "gdb_assert.h" |
| #include "gdb_string.h" |
| #include "osabi.h" |
| #include "solib-svr4.h" |
| #include "trad-frame.h" |
| #include "tramp-frame.h" |
| #include "symtab.h" |
| #include "regset.h" |
| #include "regcache.h" |
| #include "linux-tdep.h" |
| #include "glibc-tdep.h" |
| #include "nios2-tdep.h" |
| |
| #include "features/nios2-linux.c" |
| |
| /* Core file and register set support. */ |
| |
| /* Map from the normal register enumeration order to the order that |
| registers appear in core files, which corresponds to the order |
| of the register slots in the kernel's struct pt_regs. */ |
| |
| static const int reg_offsets[NIOS2_NUM_REGS] = |
| { |
| -1, 8, 9, 10, 11, 12, 13, 14, /* r0 - r7 */ |
| 0, 1, 2, 3, 4, 5, 6, 7, /* r8 - r15 */ |
| 23, 24, 25, 26, 27, 28, 29, 30, /* r16 - r23 */ |
| -1, -1, 19, 18, 17, 21, -1, 16, /* et bt gp sp fp ea ba ra */ |
| 21, /* pc */ |
| -1, 20, -1, -1, -1, -1, -1, -1, /* status estatus ... */ |
| -1, -1, -1, -1, -1, -1, -1, -1 |
| }; |
| |
| /* Implement the supply_regset hook for core files. */ |
| |
| static void |
| nios2_supply_gregset (const struct regset *regset, |
| struct regcache *regcache, |
| int regnum, const void *gregs_buf, size_t len) |
| { |
| const gdb_byte *gregs = gregs_buf; |
| int regno; |
| static const gdb_byte zero_buf[4] = {0, 0, 0, 0}; |
| |
| for (regno = NIOS2_Z_REGNUM; regno <= NIOS2_MPUACC_REGNUM; regno++) |
| if (regnum == -1 || regnum == regno) |
| { |
| if (reg_offsets[regno] != -1) |
| regcache_raw_supply (regcache, regno, |
| gregs + 4 * reg_offsets[regno]); |
| else |
| regcache_raw_supply (regcache, regno, zero_buf); |
| } |
| } |
| |
| static struct regset nios2_core_regset = |
| { |
| NULL, |
| nios2_supply_gregset, |
| NULL, |
| NULL |
| }; |
| |
| /* Implement the regset_from_core_section gdbarch method. */ |
| |
| static const struct regset * |
| nios2_regset_from_core_section (struct gdbarch *gdbarch, |
| const char *sect_name, size_t sect_size) |
| { |
| if (strcmp (sect_name, ".reg") == 0) |
| return &nios2_core_regset; |
| |
| return NULL; |
| } |
| |
| /* Initialize a trad-frame cache corresponding to the tramp-frame. |
| FUNC is the address of the instruction TRAMP[0] in memory. */ |
| |
| static void |
| nios2_linux_sigreturn_init (const struct tramp_frame *self, |
| struct frame_info *next_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func) |
| { |
| CORE_ADDR base = func + 16; |
| int i; |
| |
| for (i = 0; i < 8; i++) |
| trad_frame_set_reg_addr (this_cache, i + 8, base + i * 4); |
| for (i = 0; i < 7; i++) |
| trad_frame_set_reg_addr (this_cache, i + 1, base + (i + 8) * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 16 * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 17 * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 18 * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 19 * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_ESTATUS_REGNUM, base + 20 * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 21 * 4); |
| |
| /* Save a frame ID. */ |
| trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| } |
| |
| /* Initialize a trad-frame cache corresponding to the tramp-frame. |
| FUNC is the address of the instruction TRAMP[0] in memory. */ |
| |
| static void |
| nios2_linux_rt_sigreturn_init (const struct tramp_frame *self, |
| struct frame_info *next_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func) |
| { |
| CORE_ADDR base = func + 41 * 4; |
| int i; |
| |
| for (i = 0; i < 23; i++) |
| trad_frame_set_reg_addr (this_cache, i + 1, base + i * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 23 * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 24 * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 25 * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 27 * 4); |
| trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 28 * 4); |
| |
| /* Save a frame ID. */ |
| trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| } |
| |
| static struct tramp_frame nios2_linux_sigreturn_tramp_frame = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0x00800004 | (119 << 6), -1 }, /* movi r2,__NR_sigreturn */ |
| { 0x003b683a, -1 }, /* trap */ |
| { TRAMP_SENTINEL_INSN } |
| }, |
| nios2_linux_sigreturn_init |
| }; |
| |
| static struct tramp_frame nios2_linux_rt_sigreturn_tramp_frame = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0x00800004 | (173 << 6), -1 }, /* movi r2,__NR_rt_sigreturn */ |
| { 0x003b683a, -1 }, /* trap */ |
| { TRAMP_SENTINEL_INSN } |
| }, |
| nios2_linux_rt_sigreturn_init |
| }; |
| |
| /* When FRAME is at a syscall instruction, return the PC of the next |
| instruction to be executed. */ |
| |
| static CORE_ADDR |
| nios2_linux_syscall_next_pc (struct frame_info *frame) |
| { |
| CORE_ADDR pc = get_frame_pc (frame); |
| ULONGEST syscall_nr = get_frame_register_unsigned (frame, NIOS2_R2_REGNUM); |
| |
| /* If we are about to make a sigreturn syscall, use the unwinder to |
| decode the signal frame. */ |
| if (syscall_nr == 119 /* sigreturn */ |
| || syscall_nr == 173 /* rt_sigreturn */) |
| return frame_unwind_caller_pc (frame); |
| |
| return pc + NIOS2_OPCODE_SIZE; |
| } |
| |
| /* Hook function for gdbarch_register_osabi. */ |
| |
| static void |
| nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| linux_init_abi (info, gdbarch); |
| |
| /* Shared library handling. */ |
| set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); |
| |
| set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| svr4_ilp32_fetch_link_map_offsets); |
| /* Enable TLS support. */ |
| set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| svr4_fetch_objfile_link_map); |
| /* Core file support. */ |
| set_gdbarch_regset_from_core_section (gdbarch, |
| nios2_regset_from_core_section); |
| /* Linux signal frame unwinders. */ |
| tramp_frame_prepend_unwinder (gdbarch, |
| &nios2_linux_sigreturn_tramp_frame); |
| tramp_frame_prepend_unwinder (gdbarch, |
| &nios2_linux_rt_sigreturn_tramp_frame); |
| |
| tdep->syscall_next_pc = nios2_linux_syscall_next_pc; |
| |
| /* Index of target address word in glibc jmp_buf. */ |
| tdep->jb_pc = 10; |
| } |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| |
| extern initialize_file_ftype _initialize_nios2_linux_tdep; |
| |
| void |
| _initialize_nios2_linux_tdep (void) |
| { |
| gdbarch_register_osabi (bfd_arch_nios2, 0, GDB_OSABI_LINUX, |
| nios2_linux_init_abi); |
| |
| initialize_tdesc_nios2_linux (); |
| } |