From d11968d37d20ed65dc9432822b83e948d95b46fe Mon Sep 17 00:00:00 2001 From: Sandra Loosemore Date: Tue, 7 May 2013 01:09:27 +0000 Subject: 2013-05-06 Sandra Loosemore Andrew Jenner Chung-Lin Tang Julian Brown Based on the nios2-elf port from Altera Corporation. gdb/ * Makefile.in (ALL_TARGET_OBS): Add nios2-tdep.o and nios2-linux-tdep.o. (HFILES_NO_SRCDIR): Add nios2-tdep.h. (ALLDEPFILES): Add nios2-tdep.c and nios2-linux-tdep.c. * configure.tgt: Add nios2*-*-linux* and nios2*-*-* targets. * nios2-tdep.h: New. * nios2-tdep.c: New. * nios2-linux-tdep.c: New. * features/Makefile (WHICH): Add nios2-linux. (nios2-linux-expedite): Set. * features/nios2-cpu.xml: New. * features/nios2.xml: New. * features/nios2-linux.xml: New. * features/nios2.c: New (autogenerated). * features/nios2-linux.c: New (autogenerated). * regformats/nios2-linux.dat: New (autogenerated). * NEWS (Changes since GDB 7.6): Add new Nios II targets and commands. gdb/doc/ * gdb.texinfo (Nios II): New section. (Nios II Features): New section. --- gdb/nios2-linux-tdep.c | 233 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 233 insertions(+) create mode 100644 gdb/nios2-linux-tdep.c (limited to 'gdb/nios2-linux-tdep.c') diff --git a/gdb/nios2-linux-tdep.c b/gdb/nios2-linux-tdep.c new file mode 100644 index 00000000000..67f400701b3 --- /dev/null +++ b/gdb/nios2-linux-tdep.c @@ -0,0 +1,233 @@ +/* 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 . */ + +#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 (); +} -- cgit v1.2.1