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authorSandra Loosemore <sandra@codesourcery.com>2013-05-07 01:09:27 +0000
committerSandra Loosemore <sandra@codesourcery.com>2013-05-07 01:09:27 +0000
commitd11968d37d20ed65dc9432822b83e948d95b46fe (patch)
tree1edbd0a09d422b3609ef07ae5067616d28ace92c /gdb/nios2-linux-tdep.c
parent07c04815e9ba61fb80dfa8b09c88eaabf432126e (diff)
downloadgdb-d11968d37d20ed65dc9432822b83e948d95b46fe.tar.gz
2013-05-06 Sandra Loosemore <sandra@codesourcery.com>
Andrew Jenner <andrew@codesourcery.com> Chung-Lin Tang <cltang@codesourcery.com> Julian Brown <julian@codesourcery.com> 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.
Diffstat (limited to 'gdb/nios2-linux-tdep.c')
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diff --git a/gdb/nios2-linux-tdep.c b/gdb/nios2-linux-tdep.c
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+/* 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 ();
+}