* configure.tgt: Handle tic6x-*-*linux and tic6x-*-*.
* solib-dsbt.c: New file. Support DSBT shared object.
* tic6x-linux-tdep.c: New file.
* tic6x-tdep.c: New file.
* tic6x-tdep.h: New file.
+2011-08-14 Andrew Jenner <andrew@codesourcery.com>
+ Bernd Schmidt <bernds@codesourcery.com>
+ Yao Qi <yao@codesourcery.com>
+
+ * configure.tgt: Handle tic6x-*-*linux and tic6x-*-*.
+ * solib-dsbt.c: New file. Support DSBT shared object.
+ * tic6x-linux-tdep.c: New file.
+ * tic6x-tdep.c: New file.
+ * tic6x-tdep.h: New file.
+
2011-08-14 Andrew Stubbs <ams@codesourcery.com>
Yao Qi <yao@codesourcery.com>
build_gdbserver=yes
;;
+tic6x-*-*linux)
+ # Target: GNU/Linux TI C6x
+ gdb_target_obs="tic6x-tdep.o tic6x-linux-tdep.o solib-dsbt.o \
+ glibc-tdep.o corelow.o linux-tdep.o"
+ ;;
+
+tic6x-*-*)
+ # Target: TI C6X
+ gdb_target_obs="tic6x-tdep.o"
+ ;;
+
xstormy16-*-*)
# Target: Sanyo Xstormy16a processor
gdb_target_obs="xstormy16-tdep.o"
--- /dev/null
+/* Handle TIC6X (DSBT) shared libraries for GDB, the GNU Debugger.
+ Copyright (C) 2010, 2011 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 "defs.h"
+#include "gdb_string.h"
+#include "inferior.h"
+#include "gdbcore.h"
+#include "solib.h"
+#include "solist.h"
+#include "objfiles.h"
+#include "symtab.h"
+#include "language.h"
+#include "command.h"
+#include "gdbcmd.h"
+#include "elf-bfd.h"
+#include "exceptions.h"
+
+#define GOT_MODULE_OFFSET 4
+
+/* Flag which indicates whether internal debug messages should be printed. */
+static int solib_dsbt_debug = 0;
+
+/* TIC6X pointers are four bytes wide. */
+enum { TIC6X_PTR_SIZE = 4 };
+
+/* Representation of loadmap and related structs for the TIC6X DSBT. */
+
+/* External versions; the size and alignment of the fields should be
+ the same as those on the target. When loaded, the placement of
+ the bits in each field will be the same as on the target. */
+typedef gdb_byte ext_Elf32_Half[2];
+typedef gdb_byte ext_Elf32_Addr[4];
+typedef gdb_byte ext_Elf32_Word[4];
+
+struct ext_elf32_dsbt_loadseg
+{
+ /* Core address to which the segment is mapped. */
+ ext_Elf32_Addr addr;
+ /* VMA recorded in the program header. */
+ ext_Elf32_Addr p_vaddr;
+ /* Size of this segment in memory. */
+ ext_Elf32_Word p_memsz;
+};
+
+struct ext_elf32_dsbt_loadmap {
+ /* Protocol version number, must be zero. */
+ ext_Elf32_Word version;
+ /* A pointer to the DSBT table; the DSBT size and the index of this
+ module. */
+ ext_Elf32_Word dsbt_table_ptr;
+ ext_Elf32_Word dsbt_size;
+ ext_Elf32_Word dsbt_index;
+ /* Number of segments in this map. */
+ ext_Elf32_Word nsegs;
+ /* The actual memory map. */
+ struct ext_elf32_dsbt_loadseg segs[1 /* nsegs, actually */];
+};
+
+/* Internal versions; the types are GDB types and the data in each
+ of the fields is (or will be) decoded from the external struct
+ for ease of consumption. */
+struct int_elf32_dsbt_loadseg
+{
+ /* Core address to which the segment is mapped. */
+ CORE_ADDR addr;
+ /* VMA recorded in the program header. */
+ CORE_ADDR p_vaddr;
+ /* Size of this segment in memory. */
+ long p_memsz;
+};
+
+struct int_elf32_dsbt_loadmap
+{
+ /* Protocol version number, must be zero. */
+ int version;
+ CORE_ADDR dsbt_table_ptr;
+ /* A pointer to the DSBT table; the DSBT size and the index of this
+ module. */
+ int dsbt_size, dsbt_index;
+ /* Number of segments in this map. */
+ int nsegs;
+ /* The actual memory map. */
+ struct int_elf32_dsbt_loadseg segs[1 /* nsegs, actually */];
+};
+
+/* External link_map and elf32_dsbt_loadaddr struct definitions. */
+
+typedef gdb_byte ext_ptr[4];
+
+struct ext_elf32_dsbt_loadaddr
+{
+ ext_ptr map; /* struct elf32_dsbt_loadmap *map; */
+};
+
+struct ext_link_map
+{
+ struct ext_elf32_dsbt_loadaddr l_addr;
+
+ /* Absolute file name object was found in. */
+ ext_ptr l_name; /* char *l_name; */
+
+ /* Dynamic section of the shared object. */
+ ext_ptr l_ld; /* ElfW(Dyn) *l_ld; */
+
+ /* Chain of loaded objects. */
+ ext_ptr l_next, l_prev; /* struct link_map *l_next, *l_prev; */
+};
+
+/* Link map info to include in an allocated so_list entry */
+
+struct lm_info
+{
+ /* The loadmap, digested into an easier to use form. */
+ struct int_elf32_dsbt_loadmap *map;
+};
+
+/* Per pspace dsbt specific data. */
+
+struct dsbt_info
+{
+ /* The load map, got value, etc. are not available from the chain
+ of loaded shared objects. ``main_executable_lm_info'' provides
+ a way to get at this information so that it doesn't need to be
+ frequently recomputed. Initialized by dsbt_relocate_main_executable. */
+ struct lm_info *main_executable_lm_info;
+
+ /* Load maps for the main executable and the interpreter. These are obtained
+ from ptrace. They are the starting point for getting into the program,
+ and are required to find the solib list with the individual load maps for
+ each module. */
+ struct int_elf32_dsbt_loadmap *exec_loadmap;
+ struct int_elf32_dsbt_loadmap *interp_loadmap;
+
+ /* Cached value for lm_base, below. */
+ CORE_ADDR lm_base_cache;
+
+ /* Link map address for main module. */
+ CORE_ADDR main_lm_addr;
+
+ int enable_break2_done;
+
+ CORE_ADDR interp_text_sect_low;
+ CORE_ADDR interp_text_sect_high;
+ CORE_ADDR interp_plt_sect_low;
+ CORE_ADDR interp_plt_sect_high;
+};
+
+/* Per-program-space data key. */
+static const struct program_space_data *solib_dsbt_pspace_data;
+
+static void
+dsbt_pspace_data_cleanup (struct program_space *pspace, void *arg)
+{
+ struct dsbt_info *info;
+
+ info = program_space_data (pspace, solib_dsbt_pspace_data);
+ xfree (info);
+}
+
+/* Get the current dsbt data. If none is found yet, add it now. This
+ function always returns a valid object. */
+
+static struct dsbt_info *
+get_dsbt_info (void)
+{
+ struct dsbt_info *info;
+
+ info = program_space_data (current_program_space, solib_dsbt_pspace_data);
+ if (info != NULL)
+ return info;
+
+ info = XZALLOC (struct dsbt_info);
+ set_program_space_data (current_program_space, solib_dsbt_pspace_data, info);
+
+ info->enable_break2_done = 0;
+ info->lm_base_cache = 0;
+ info->main_lm_addr = 0;
+
+ return info;
+}
+
+
+static void
+dsbt_print_loadmap (struct int_elf32_dsbt_loadmap *map)
+{
+ int i;
+
+ if (map == NULL)
+ printf_filtered ("(null)\n");
+ else if (map->version != 0)
+ printf_filtered (_("Unsupported map version: %d\n"), map->version);
+ else
+ {
+ printf_filtered ("version %d\n", map->version);
+
+ for (i = 0; i < map->nsegs; i++)
+ printf_filtered ("%s:%s -> %s:%s\n",
+ print_core_address (target_gdbarch,
+ map->segs[i].p_vaddr),
+ print_core_address (target_gdbarch,
+ map->segs[i].p_vaddr
+ + map->segs[i].p_memsz),
+ print_core_address (target_gdbarch, map->segs[i].addr),
+ print_core_address (target_gdbarch, map->segs[i].addr
+ + map->segs[i].p_memsz));
+ }
+}
+
+/* Decode int_elf32_dsbt_loadmap from BUF. */
+
+static struct int_elf32_dsbt_loadmap *
+decode_loadmap (gdb_byte *buf)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+ struct ext_elf32_dsbt_loadmap *ext_ldmbuf;
+ struct int_elf32_dsbt_loadmap *int_ldmbuf;
+
+ int version, seg, nsegs;
+ int ext_ldmbuf_size, int_ldmbuf_size;
+
+ ext_ldmbuf = (struct ext_elf32_dsbt_loadmap *) buf;
+
+ /* Extract the version. */
+ version = extract_unsigned_integer (ext_ldmbuf->version,
+ sizeof ext_ldmbuf->version,
+ byte_order);
+ if (version != 0)
+ {
+ /* We only handle version 0. */
+ return NULL;
+ }
+
+ /* Extract the number of segments. */
+ nsegs = extract_unsigned_integer (ext_ldmbuf->nsegs,
+ sizeof ext_ldmbuf->nsegs,
+ byte_order);
+
+ if (nsegs <= 0)
+ return NULL;
+
+ /* Allocate space into which to put information extract from the
+ external loadsegs. I.e, allocate the internal loadsegs. */
+ int_ldmbuf_size = (sizeof (struct int_elf32_dsbt_loadmap)
+ + (nsegs - 1) * sizeof (struct int_elf32_dsbt_loadseg));
+ int_ldmbuf = xmalloc (int_ldmbuf_size);
+
+ /* Place extracted information in internal structs. */
+ int_ldmbuf->version = version;
+ int_ldmbuf->nsegs = nsegs;
+ for (seg = 0; seg < nsegs; seg++)
+ {
+ int_ldmbuf->segs[seg].addr
+ = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr,
+ sizeof (ext_ldmbuf->segs[seg].addr),
+ byte_order);
+ int_ldmbuf->segs[seg].p_vaddr
+ = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr,
+ sizeof (ext_ldmbuf->segs[seg].p_vaddr),
+ byte_order);
+ int_ldmbuf->segs[seg].p_memsz
+ = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz,
+ sizeof (ext_ldmbuf->segs[seg].p_memsz),
+ byte_order);
+ }
+
+ xfree (ext_ldmbuf);
+ return int_ldmbuf;
+}
+
+
+static struct dsbt_info *get_dsbt_info (void);
+
+/* Interrogate the Linux kernel to find out where the program was loaded.
+ There are two load maps; one for the executable and one for the
+ interpreter (only in the case of a dynamically linked executable). */
+
+static void
+dsbt_get_initial_loadmaps (void)
+{
+ gdb_byte *buf;
+ struct dsbt_info *info = get_dsbt_info ();
+
+ if (0 >= target_read_alloc (¤t_target, TARGET_OBJECT_FDPIC,
+ "exec", (gdb_byte**) &buf))
+ {
+ info->exec_loadmap = NULL;
+ error (_("Error reading DSBT exec loadmap"));
+ }
+ info->exec_loadmap = decode_loadmap (buf);
+ if (solib_dsbt_debug)
+ dsbt_print_loadmap (info->exec_loadmap);
+
+ if (0 >= target_read_alloc (¤t_target, TARGET_OBJECT_FDPIC,
+ "interp", (gdb_byte**)&buf))
+ {
+ info->interp_loadmap = NULL;
+ error (_("Error reading DSBT interp loadmap"));
+ }
+ info->interp_loadmap = decode_loadmap (buf);
+ if (solib_dsbt_debug)
+ dsbt_print_loadmap (info->interp_loadmap);
+}
+
+/* Given address LDMADDR, fetch and decode the loadmap at that address.
+ Return NULL if there is a problem reading the target memory or if
+ there doesn't appear to be a loadmap at the given address. The
+ allocated space (representing the loadmap) returned by this
+ function may be freed via a single call to xfree. */
+
+static struct int_elf32_dsbt_loadmap *
+fetch_loadmap (CORE_ADDR ldmaddr)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+ struct ext_elf32_dsbt_loadmap ext_ldmbuf_partial;
+ struct ext_elf32_dsbt_loadmap *ext_ldmbuf;
+ struct int_elf32_dsbt_loadmap *int_ldmbuf;
+ int ext_ldmbuf_size, int_ldmbuf_size;
+ int version, seg, nsegs;
+
+ /* Fetch initial portion of the loadmap. */
+ if (target_read_memory (ldmaddr, (gdb_byte *) &ext_ldmbuf_partial,
+ sizeof ext_ldmbuf_partial))
+ {
+ /* Problem reading the target's memory. */
+ return NULL;
+ }
+
+ /* Extract the version. */
+ version = extract_unsigned_integer (ext_ldmbuf_partial.version,
+ sizeof ext_ldmbuf_partial.version,
+ byte_order);
+ if (version != 0)
+ {
+ /* We only handle version 0. */
+ return NULL;
+ }
+
+ /* Extract the number of segments. */
+ nsegs = extract_unsigned_integer (ext_ldmbuf_partial.nsegs,
+ sizeof ext_ldmbuf_partial.nsegs,
+ byte_order);
+
+ if (nsegs <= 0)
+ return NULL;
+
+ /* Allocate space for the complete (external) loadmap. */
+ ext_ldmbuf_size = sizeof (struct ext_elf32_dsbt_loadmap)
+ + (nsegs - 1) * sizeof (struct ext_elf32_dsbt_loadseg);
+ ext_ldmbuf = xmalloc (ext_ldmbuf_size);
+
+ /* Copy over the portion of the loadmap that's already been read. */
+ memcpy (ext_ldmbuf, &ext_ldmbuf_partial, sizeof ext_ldmbuf_partial);
+
+ /* Read the rest of the loadmap from the target. */
+ if (target_read_memory (ldmaddr + sizeof ext_ldmbuf_partial,
+ (gdb_byte *) ext_ldmbuf + sizeof ext_ldmbuf_partial,
+ ext_ldmbuf_size - sizeof ext_ldmbuf_partial))
+ {
+ /* Couldn't read rest of the loadmap. */
+ xfree (ext_ldmbuf);
+ return NULL;
+ }
+
+ /* Allocate space into which to put information extract from the
+ external loadsegs. I.e, allocate the internal loadsegs. */
+ int_ldmbuf_size = sizeof (struct int_elf32_dsbt_loadmap)
+ + (nsegs - 1) * sizeof (struct int_elf32_dsbt_loadseg);
+ int_ldmbuf = xmalloc (int_ldmbuf_size);
+
+ /* Place extracted information in internal structs. */
+ int_ldmbuf->version = version;
+ int_ldmbuf->nsegs = nsegs;
+ for (seg = 0; seg < nsegs; seg++)
+ {
+ int_ldmbuf->segs[seg].addr
+ = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr,
+ sizeof (ext_ldmbuf->segs[seg].addr),
+ byte_order);
+ int_ldmbuf->segs[seg].p_vaddr
+ = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr,
+ sizeof (ext_ldmbuf->segs[seg].p_vaddr),
+ byte_order);
+ int_ldmbuf->segs[seg].p_memsz
+ = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz,
+ sizeof (ext_ldmbuf->segs[seg].p_memsz),
+ byte_order);
+ }
+
+ xfree (ext_ldmbuf);
+ return int_ldmbuf;
+}
+
+static void dsbt_relocate_main_executable (void);
+static int enable_break2 (void);
+
+/* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is
+ returned and the corresponding PTR is set. */
+
+static int
+scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr)
+{
+ int arch_size, step, sect_size;
+ long dyn_tag;
+ CORE_ADDR dyn_ptr, dyn_addr;
+ gdb_byte *bufend, *bufstart, *buf;
+ Elf32_External_Dyn *x_dynp_32;
+ Elf64_External_Dyn *x_dynp_64;
+ struct bfd_section *sect;
+ struct target_section *target_section;
+
+ if (abfd == NULL)
+ return 0;
+
+ if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
+ return 0;
+
+ arch_size = bfd_get_arch_size (abfd);
+ if (arch_size == -1)
+ return 0;
+
+ /* Find the start address of the .dynamic section. */
+ sect = bfd_get_section_by_name (abfd, ".dynamic");
+ if (sect == NULL)
+ return 0;
+
+ for (target_section = current_target_sections->sections;
+ target_section < current_target_sections->sections_end;
+ target_section++)
+ if (sect == target_section->the_bfd_section)
+ break;
+ if (target_section < current_target_sections->sections_end)
+ dyn_addr = target_section->addr;
+ else
+ {
+ /* ABFD may come from OBJFILE acting only as a symbol file without being
+ loaded into the target (see add_symbol_file_command). This case is
+ such fallback to the file VMA address without the possibility of
+ having the section relocated to its actual in-memory address. */
+
+ dyn_addr = bfd_section_vma (abfd, sect);
+ }
+
+ /* Read in .dynamic from the BFD. We will get the actual value
+ from memory later. */
+ sect_size = bfd_section_size (abfd, sect);
+ buf = bufstart = alloca (sect_size);
+ if (!bfd_get_section_contents (abfd, sect,
+ buf, 0, sect_size))
+ return 0;
+
+ /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */
+ step = (arch_size == 32) ? sizeof (Elf32_External_Dyn)
+ : sizeof (Elf64_External_Dyn);
+ for (bufend = buf + sect_size;
+ buf < bufend;
+ buf += step)
+ {
+ if (arch_size == 32)
+ {
+ x_dynp_32 = (Elf32_External_Dyn *) buf;
+ dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag);
+ dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr);
+ }
+ else
+ {
+ x_dynp_64 = (Elf64_External_Dyn *) buf;
+ dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag);
+ dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr);
+ }
+ if (dyn_tag == DT_NULL)
+ return 0;
+ if (dyn_tag == dyntag)
+ {
+ /* If requested, try to read the runtime value of this .dynamic
+ entry. */
+ if (ptr)
+ {
+ struct type *ptr_type;
+ gdb_byte ptr_buf[8];
+ CORE_ADDR ptr_addr;
+
+ ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
+ ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8;
+ if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0)
+ dyn_ptr = extract_typed_address (ptr_buf, ptr_type);
+ *ptr = dyn_ptr;
+ }
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+/* An expensive way to lookup the value of a single symbol for
+ bfd's that are only temporary anyway. This is used by the
+ shared library support to find the address of the debugger
+ interface structures in the shared library.
+
+ Note that 0 is specifically allowed as an error return (no
+ such symbol). */
+
+static CORE_ADDR
+bfd_lookup_symbol (bfd *abfd, char *symname)
+{
+ long storage_needed;
+ asymbol *sym;
+ asymbol **symbol_table;
+ unsigned int number_of_symbols;
+ unsigned int i;
+ struct cleanup *back_to;
+ CORE_ADDR symaddr = 0;
+
+ storage_needed = bfd_get_symtab_upper_bound (abfd);
+
+ if (storage_needed > 0)
+ {
+ symbol_table = (asymbol **) xmalloc (storage_needed);
+ back_to = make_cleanup (xfree, symbol_table);
+ number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
+
+ for (i = 0; i < number_of_symbols; i++)
+ {
+ sym = *symbol_table++;
+ if (strcmp (sym->name, symname) == 0)
+ {
+ /* Bfd symbols are section relative. */
+ symaddr = sym->value + sym->section->vma;
+ break;
+ }
+ }
+ do_cleanups (back_to);
+ }
+
+ if (symaddr)
+ return symaddr;
+
+ /* Look for the symbol in the dynamic string table too. */
+
+ storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd);
+
+ if (storage_needed > 0)
+ {
+ symbol_table = (asymbol **) xmalloc (storage_needed);
+ back_to = make_cleanup (xfree, symbol_table);
+ number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table);
+
+ for (i = 0; i < number_of_symbols; i++)
+ {
+ sym = *symbol_table++;
+ if (strcmp (sym->name, symname) == 0)
+ {
+ /* Bfd symbols are section relative. */
+ symaddr = sym->value + sym->section->vma;
+ break;
+ }
+ }
+ do_cleanups (back_to);
+ }
+
+ return symaddr;
+}
+
+
+/* If no open symbol file, attempt to locate and open the main symbol
+ file.
+
+ If FROM_TTYP dereferences to a non-zero integer, allow messages to
+ be printed. This parameter is a pointer rather than an int because
+ open_symbol_file_object is called via catch_errors and
+ catch_errors requires a pointer argument. */
+
+static int
+open_symbol_file_object (void *from_ttyp)
+{
+ /* Unimplemented. */
+ return 0;
+}
+
+/* Given a loadmap and an address, return the displacement needed
+ to relocate the address. */
+
+static CORE_ADDR
+displacement_from_map (struct int_elf32_dsbt_loadmap *map,
+ CORE_ADDR addr)
+{
+ int seg;
+
+ for (seg = 0; seg < map->nsegs; seg++)
+ if (map->segs[seg].p_vaddr <= addr
+ && addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz)
+ return map->segs[seg].addr - map->segs[seg].p_vaddr;
+
+ return 0;
+}
+
+/* Return the address from which the link map chain may be found. On
+ DSBT, a pointer to the start of the link map will be located at the
+ word found at base of GOT + GOT_MODULE_OFFSET.
+
+ The base of GOT may be found in a number of ways. Assuming that the
+ main executable has already been relocated,
+ 1 The easiest way to find this value is to look up the address of
+ _GLOBAL_OFFSET_TABLE_.
+ 2 The other way is to look for tag DT_PLTGOT, which contains the virtual
+ address of Global Offset Table. .*/
+
+static CORE_ADDR
+lm_base (void)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+ struct minimal_symbol *got_sym;
+ CORE_ADDR addr;
+ gdb_byte buf[TIC6X_PTR_SIZE];
+ struct dsbt_info *info = get_dsbt_info ();
+
+ /* One of our assumptions is that the main executable has been relocated.
+ Bail out if this has not happened. (Note that post_create_inferior
+ in infcmd.c will call solib_add prior to solib_create_inferior_hook.
+ If we allow this to happen, lm_base_cache will be initialized with
+ a bogus value. */
+ if (info->main_executable_lm_info == 0)
+ return 0;
+
+ /* If we already have a cached value, return it. */
+ if (info->lm_base_cache)
+ return info->lm_base_cache;
+
+ got_sym = lookup_minimal_symbol ("_GLOBAL_OFFSET_TABLE_", NULL,
+ symfile_objfile);
+
+ if (got_sym != 0)
+ {
+ addr = SYMBOL_VALUE_ADDRESS (got_sym);
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "lm_base: get addr %x by _GLOBAL_OFFSET_TABLE_.\n",
+ (unsigned int) addr);
+ }
+ else if (scan_dyntag (DT_PLTGOT, exec_bfd, &addr))
+ {
+ struct int_elf32_dsbt_loadmap *ldm;
+
+ dsbt_get_initial_loadmaps ();
+ ldm = info->exec_loadmap;
+ addr += displacement_from_map (ldm, addr);
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "lm_base: get addr %x by DT_PLTGOT.\n",
+ (unsigned int) addr);
+ }
+ else
+ {
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "lm_base: _GLOBAL_OFFSET_TABLE_ not found.\n");
+ return 0;
+ }
+ addr += GOT_MODULE_OFFSET;
+
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "lm_base: _GLOBAL_OFFSET_TABLE_ + %d = %s\n",
+ GOT_MODULE_OFFSET, hex_string_custom (addr, 8));
+
+ if (target_read_memory (addr, buf, sizeof buf) != 0)
+ return 0;
+ info->lm_base_cache = extract_unsigned_integer (buf, sizeof buf, byte_order);
+
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "lm_base: lm_base_cache = %s\n",
+ hex_string_custom (info->lm_base_cache, 8));
+
+ return info->lm_base_cache;
+}
+
+
+/* Build a list of `struct so_list' objects describing the shared
+ objects currently loaded in the inferior. This list does not
+ include an entry for the main executable file.
+
+ Note that we only gather information directly available from the
+ inferior --- we don't examine any of the shared library files
+ themselves. The declaration of `struct so_list' says which fields
+ we provide values for. */
+
+static struct so_list *
+dsbt_current_sos (void)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+ CORE_ADDR lm_addr;
+ struct so_list *sos_head = NULL;
+ struct so_list **sos_next_ptr = &sos_head;
+ struct dsbt_info *info = get_dsbt_info ();
+
+ /* Make sure that the main executable has been relocated. This is
+ required in order to find the address of the global offset table,
+ which in turn is used to find the link map info. (See lm_base
+ for details.)
+
+ Note that the relocation of the main executable is also performed
+ by SOLIB_CREATE_INFERIOR_HOOK, however, in the case of core
+ files, this hook is called too late in order to be of benefit to
+ SOLIB_ADD. SOLIB_ADD eventually calls this function,
+ dsbt_current_sos, and also precedes the call to
+ SOLIB_CREATE_INFERIOR_HOOK. (See post_create_inferior in
+ infcmd.c.) */
+ if (info->main_executable_lm_info == 0 && core_bfd != NULL)
+ dsbt_relocate_main_executable ();
+
+ /* Locate the address of the first link map struct. */
+ lm_addr = lm_base ();
+
+ /* We have at least one link map entry. Fetch the the lot of them,
+ building the solist chain. */
+ while (lm_addr)
+ {
+ struct ext_link_map lm_buf;
+ ext_Elf32_Word indexword;
+ CORE_ADDR map_addr;
+ int dsbt_index;
+ int ret;
+
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "current_sos: reading link_map entry at %s\n",
+ hex_string_custom (lm_addr, 8));
+
+ ret = target_read_memory (lm_addr, (gdb_byte *) &lm_buf, sizeof (lm_buf));
+ if (ret)
+ {
+ warning (_("dsbt_current_sos: Unable to read link map entry."
+ " Shared object chain may be incomplete."));
+ break;
+ }
+
+ /* Fetch the load map address. */
+ map_addr = extract_unsigned_integer (lm_buf.l_addr.map,
+ sizeof lm_buf.l_addr.map,
+ byte_order);
+
+ ret = target_read_memory (map_addr + 12, (gdb_byte *) &indexword,
+ sizeof indexword);
+ if (ret)
+ {
+ warning (_("dsbt_current_sos: Unable to read dsbt index."
+ " Shared object chain may be incomplete."));
+ break;
+ }
+ dsbt_index = extract_unsigned_integer (indexword, sizeof indexword,
+ byte_order);
+
+ /* If the DSBT index is zero, then we're looking at the entry
+ for the main executable. By convention, we don't include
+ this in the list of shared objects. */
+ if (dsbt_index != 0)
+ {
+ int errcode;
+ char *name_buf;
+ struct int_elf32_dsbt_loadmap *loadmap;
+ struct so_list *sop;
+ CORE_ADDR addr;
+
+ loadmap = fetch_loadmap (map_addr);
+ if (loadmap == NULL)
+ {
+ warning (_("dsbt_current_sos: Unable to fetch load map."
+ " Shared object chain may be incomplete."));
+ break;
+ }
+
+ sop = xcalloc (1, sizeof (struct so_list));
+ sop->lm_info = xcalloc (1, sizeof (struct lm_info));
+ sop->lm_info->map = loadmap;
+ /* Fetch the name. */
+ addr = extract_unsigned_integer (lm_buf.l_name,
+ sizeof (lm_buf.l_name),
+ byte_order);
+ target_read_string (addr, &name_buf, SO_NAME_MAX_PATH_SIZE - 1,
+ &errcode);
+
+ if (errcode != 0)
+ warning (_("Can't read pathname for link map entry: %s."),
+ safe_strerror (errcode));
+ else
+ {
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog, "current_sos: name = %s\n",
+ name_buf);
+
+ strncpy (sop->so_name, name_buf, SO_NAME_MAX_PATH_SIZE - 1);
+ sop->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
+ xfree (name_buf);
+ strcpy (sop->so_original_name, sop->so_name);
+ }
+
+ *sos_next_ptr = sop;
+ sos_next_ptr = &sop->next;
+ }
+ else
+ {
+ info->main_lm_addr = lm_addr;
+ }
+
+ lm_addr = extract_unsigned_integer (lm_buf.l_next,
+ sizeof (lm_buf.l_next), byte_order);
+ }
+
+ enable_break2 ();
+
+ return sos_head;
+}
+
+/* Return 1 if PC lies in the dynamic symbol resolution code of the
+ run time loader. */
+
+static int
+dsbt_in_dynsym_resolve_code (CORE_ADDR pc)
+{
+ struct dsbt_info *info = get_dsbt_info ();
+
+ return ((pc >= info->interp_text_sect_low && pc < info->interp_text_sect_high)
+ || (pc >= info->interp_plt_sect_low && pc < info->interp_plt_sect_high)
+ || in_plt_section (pc, NULL));
+}
+
+/* Print a warning about being unable to set the dynamic linker
+ breakpoint. */
+
+static void
+enable_break_failure_warning (void)
+{
+ warning (_("Unable to find dynamic linker breakpoint function.\n"
+ "GDB will be unable to debug shared library initializers\n"
+ "and track explicitly loaded dynamic code."));
+}
+
+/* The dynamic linkers has, as part of its debugger interface, support
+ for arranging for the inferior to hit a breakpoint after mapping in
+ the shared libraries. This function enables that breakpoint.
+
+ On the TIC6X, using the shared library (DSBT), the symbol
+ _dl_debug_addr points to the r_debug struct which contains
+ a field called r_brk. r_brk is the address of the function
+ descriptor upon which a breakpoint must be placed. Being a
+ function descriptor, we must extract the entry point in order
+ to set the breakpoint.
+
+ Our strategy will be to get the .interp section from the
+ executable. This section will provide us with the name of the
+ interpreter. We'll open the interpreter and then look up
+ the address of _dl_debug_addr. We then relocate this address
+ using the interpreter's loadmap. Once the relocated address
+ is known, we fetch the value (address) corresponding to r_brk
+ and then use that value to fetch the entry point of the function
+ we're interested in. */
+
+static int
+enable_break2 (void)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+ int success = 0;
+ char **bkpt_namep;
+ asection *interp_sect;
+ struct dsbt_info *info = get_dsbt_info ();
+
+ if (exec_bfd == NULL)
+ return 0;
+
+ if (!target_has_execution)
+ return 0;
+
+ if (info->enable_break2_done)
+ return 1;
+
+ info->interp_text_sect_low = 0;
+ info->interp_text_sect_high = 0;
+ info->interp_plt_sect_low = 0;
+ info->interp_plt_sect_high = 0;
+
+ /* Find the .interp section; if not found, warn the user and drop
+ into the old breakpoint at symbol code. */
+ interp_sect = bfd_get_section_by_name (exec_bfd, ".interp");
+ if (interp_sect)
+ {
+ unsigned int interp_sect_size;
+ gdb_byte *buf;
+ bfd *tmp_bfd = NULL;
+ int status;
+ CORE_ADDR addr, interp_loadmap_addr;
+ gdb_byte addr_buf[TIC6X_PTR_SIZE];
+ struct int_elf32_dsbt_loadmap *ldm;
+ volatile struct gdb_exception ex;
+
+ /* Read the contents of the .interp section into a local buffer;
+ the contents specify the dynamic linker this program uses. */
+ interp_sect_size = bfd_section_size (exec_bfd, interp_sect);
+ buf = alloca (interp_sect_size);
+ bfd_get_section_contents (exec_bfd, interp_sect,
+ buf, 0, interp_sect_size);
+
+ /* Now we need to figure out where the dynamic linker was
+ loaded so that we can load its symbols and place a breakpoint
+ in the dynamic linker itself. */
+
+ TRY_CATCH (ex, RETURN_MASK_ALL)
+ {
+ tmp_bfd = solib_bfd_open (buf);
+ }
+ if (tmp_bfd == NULL)
+ {
+ enable_break_failure_warning ();
+ return 0;
+ }
+
+ dsbt_get_initial_loadmaps ();
+ ldm = info->interp_loadmap;
+
+ /* Record the relocated start and end address of the dynamic linker
+ text and plt section for dsbt_in_dynsym_resolve_code. */
+ interp_sect = bfd_get_section_by_name (tmp_bfd, ".text");
+ if (interp_sect)
+ {
+ info->interp_text_sect_low
+ = bfd_section_vma (tmp_bfd, interp_sect);
+ info->interp_text_sect_low
+ += displacement_from_map (ldm, info->interp_text_sect_low);
+ info->interp_text_sect_high
+ = info->interp_text_sect_low
+ + bfd_section_size (tmp_bfd, interp_sect);
+ }
+ interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt");
+ if (interp_sect)
+ {
+ info->interp_plt_sect_low =
+ bfd_section_vma (tmp_bfd, interp_sect);
+ info->interp_plt_sect_low
+ += displacement_from_map (ldm, info->interp_plt_sect_low);
+ info->interp_plt_sect_high =
+ info->interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect);
+ }
+
+ addr = bfd_lookup_symbol (tmp_bfd, "_dl_debug_addr");
+ if (addr == 0)
+ {
+ warning (_("Could not find symbol _dl_debug_addr in dynamic linker"));
+ enable_break_failure_warning ();
+ bfd_close (tmp_bfd);
+ return 0;
+ }
+
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "enable_break: _dl_debug_addr (prior to relocation) = %s\n",
+ hex_string_custom (addr, 8));
+
+ addr += displacement_from_map (ldm, addr);
+
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "enable_break: _dl_debug_addr (after relocation) = %s\n",
+ hex_string_custom (addr, 8));
+
+ /* Fetch the address of the r_debug struct. */
+ if (target_read_memory (addr, addr_buf, sizeof addr_buf) != 0)
+ {
+ warning (_("Unable to fetch contents of _dl_debug_addr "
+ "(at address %s) from dynamic linker"),
+ hex_string_custom (addr, 8));
+ }
+ addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order);
+
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "enable_break: _dl_debug_addr[0..3] = %s\n",
+ hex_string_custom (addr, 8));
+
+ /* If it's zero, then the ldso hasn't initialized yet, and so
+ there are no shared libs yet loaded. */
+ if (addr == 0)
+ {
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "enable_break: ldso not yet initialized\n");
+ /* Do not warn, but mark to run again. */
+ return 0;
+ }
+
+ /* Fetch the r_brk field. It's 8 bytes from the start of
+ _dl_debug_addr. */
+ if (target_read_memory (addr + 8, addr_buf, sizeof addr_buf) != 0)
+ {
+ warning (_("Unable to fetch _dl_debug_addr->r_brk "
+ "(at address %s) from dynamic linker"),
+ hex_string_custom (addr + 8, 8));
+ enable_break_failure_warning ();
+ bfd_close (tmp_bfd);
+ return 0;
+ }
+ addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order);
+
+ /* We're done with the temporary bfd. */
+ bfd_close (tmp_bfd);
+
+ /* We're also done with the loadmap. */
+ xfree (ldm);
+
+ /* Remove all the solib event breakpoints. Their addresses
+ may have changed since the last time we ran the program. */
+ remove_solib_event_breakpoints ();
+
+ /* Now (finally!) create the solib breakpoint. */
+ create_solib_event_breakpoint (target_gdbarch, addr);
+
+ info->enable_break2_done = 1;
+
+ return 1;
+ }
+
+ /* Tell the user we couldn't set a dynamic linker breakpoint. */
+ enable_break_failure_warning ();
+
+ /* Failure return. */
+ return 0;
+}
+
+static int
+enable_break (void)
+{
+ asection *interp_sect;
+ struct minimal_symbol *start;
+
+ /* Check for the presence of a .interp section. If there is no
+ such section, the executable is statically linked. */
+
+ interp_sect = bfd_get_section_by_name (exec_bfd, ".interp");
+
+ if (interp_sect == NULL)
+ {
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "enable_break: No .interp section found.\n");
+ return 0;
+ }
+
+ start = lookup_minimal_symbol ("_start", NULL, symfile_objfile);
+ if (start == NULL)
+ {
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "enable_break: symbol _start is not found.\n");
+ return 0;
+ }
+
+ create_solib_event_breakpoint (target_gdbarch,
+ SYMBOL_VALUE_ADDRESS (start));
+
+ if (solib_dsbt_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "enable_break: solib event breakpoint placed at : %s\n",
+ hex_string_custom (SYMBOL_VALUE_ADDRESS (start), 8));
+ return 1;
+}
+
+/* Once the symbols from a shared object have been loaded in the usual
+ way, we are called to do any system specific symbol handling that
+ is needed. */
+
+static void
+dsbt_special_symbol_handling (void)
+{
+}
+
+static void
+dsbt_relocate_main_executable (void)
+{
+ int status;
+ CORE_ADDR exec_addr, interp_addr;
+ struct int_elf32_dsbt_loadmap *ldm;
+ struct cleanup *old_chain;
+ struct section_offsets *new_offsets;
+ int changed;
+ struct obj_section *osect;
+ struct dsbt_info *info = get_dsbt_info ();
+
+ dsbt_get_initial_loadmaps ();
+ ldm = info->exec_loadmap;
+
+ xfree (info->main_executable_lm_info);
+ info->main_executable_lm_info = xcalloc (1, sizeof (struct lm_info));
+ info->main_executable_lm_info->map = ldm;
+
+ new_offsets = xcalloc (symfile_objfile->num_sections,
+ sizeof (struct section_offsets));
+ old_chain = make_cleanup (xfree, new_offsets);
+ changed = 0;
+
+ ALL_OBJFILE_OSECTIONS (symfile_objfile, osect)
+ {
+ CORE_ADDR orig_addr, addr, offset;
+ int osect_idx;
+ int seg;
+
+ osect_idx = osect->the_bfd_section->index;
+
+ /* Current address of section. */
+ addr = obj_section_addr (osect);
+ /* Offset from where this section started. */
+ offset = ANOFFSET (symfile_objfile->section_offsets, osect_idx);
+ /* Original address prior to any past relocations. */
+ orig_addr = addr - offset;
+
+ for (seg = 0; seg < ldm->nsegs; seg++)
+ {
+ if (ldm->segs[seg].p_vaddr <= orig_addr
+ && orig_addr < ldm->segs[seg].p_vaddr + ldm->segs[seg].p_memsz)
+ {
+ new_offsets->offsets[osect_idx]
+ = ldm->segs[seg].addr - ldm->segs[seg].p_vaddr;
+
+ if (new_offsets->offsets[osect_idx] != offset)
+ changed = 1;
+ break;
+ }
+ }
+ }
+
+ if (changed)
+ objfile_relocate (symfile_objfile, new_offsets);
+
+ do_cleanups (old_chain);
+
+ /* Now that symfile_objfile has been relocated, we can compute the
+ GOT value and stash it away. */
+}
+
+/* When gdb starts up the inferior, it nurses it along (through the
+ shell) until it is ready to execute it's first instruction. At this
+ point, this function gets called via expansion of the macro
+ SOLIB_CREATE_INFERIOR_HOOK.
+
+ For the DSBT shared library, the main executable needs to be relocated.
+ The shared library breakpoints also need to be enabled.
+ */
+
+static void
+dsbt_solib_create_inferior_hook (int from_tty)
+{
+ /* Relocate main executable. */
+ dsbt_relocate_main_executable ();
+
+ /* Enable shared library breakpoints. */
+ if (!enable_break ())
+ {
+ warning (_("shared library handler failed to enable breakpoint"));
+ return;
+ }
+}
+
+static void
+dsbt_clear_solib (void)
+{
+ struct dsbt_info *info = get_dsbt_info ();
+
+ info->lm_base_cache = 0;
+ info->enable_break2_done = 0;
+ info->main_lm_addr = 0;
+ if (info->main_executable_lm_info != 0)
+ {
+ xfree (info->main_executable_lm_info->map);
+ xfree (info->main_executable_lm_info);
+ info->main_executable_lm_info = 0;
+ }
+}
+
+static void
+dsbt_free_so (struct so_list *so)
+{
+ xfree (so->lm_info->map);
+ xfree (so->lm_info);
+}
+
+static void
+dsbt_relocate_section_addresses (struct so_list *so,
+ struct target_section *sec)
+{
+ int seg;
+ struct int_elf32_dsbt_loadmap *map;
+
+ map = so->lm_info->map;
+
+ for (seg = 0; seg < map->nsegs; seg++)
+ {
+ if (map->segs[seg].p_vaddr <= sec->addr
+ && sec->addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz)
+ {
+ CORE_ADDR displ = map->segs[seg].addr - map->segs[seg].p_vaddr;
+
+ sec->addr += displ;
+ sec->endaddr += displ;
+ break;
+ }
+ }
+}
+static void
+show_dsbt_debug (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("solib-dsbt debugging is %s.\n"), value);
+}
+
+struct target_so_ops dsbt_so_ops;
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_dsbt_solib;
+
+void
+_initialize_dsbt_solib (void)
+{
+ solib_dsbt_pspace_data
+ = register_program_space_data_with_cleanup (dsbt_pspace_data_cleanup);
+
+ dsbt_so_ops.relocate_section_addresses = dsbt_relocate_section_addresses;
+ dsbt_so_ops.free_so = dsbt_free_so;
+ dsbt_so_ops.clear_solib = dsbt_clear_solib;
+ dsbt_so_ops.solib_create_inferior_hook = dsbt_solib_create_inferior_hook;
+ dsbt_so_ops.special_symbol_handling = dsbt_special_symbol_handling;
+ dsbt_so_ops.current_sos = dsbt_current_sos;
+ dsbt_so_ops.open_symbol_file_object = open_symbol_file_object;
+ dsbt_so_ops.in_dynsym_resolve_code = dsbt_in_dynsym_resolve_code;
+ dsbt_so_ops.bfd_open = solib_bfd_open;
+
+ /* Debug this file's internals. */
+ add_setshow_zinteger_cmd ("solib-dsbt", class_maintenance,
+ &solib_dsbt_debug, _("\
+Set internal debugging of shared library code for DSBT ELF."), _("\
+Show internal debugging of shared library code for DSBT ELF."), _("\
+When non-zero, DSBT solib specific internal debugging is enabled."),
+ NULL,
+ show_dsbt_debug,
+ &setdebuglist, &showdebuglist);
+}
--- /dev/null
+/* GNU/Linux on TI C6x target support.
+ Copyright (C) 2011
+ Free Software Foundation, Inc.
+ Contributed by Yao Qi <yao@codesourcery.com>
+
+ 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 "solib.h"
+#include "osabi.h"
+#include "linux-tdep.h"
+#include "tic6x-tdep.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
+#include "gdb_assert.h"
+#include "elf-bfd.h"
+#include "elf/tic6x.h"
+
+#include "features/tic6x-c64xp-linux.c"
+#include "features/tic6x-c64x-linux.c"
+#include "features/tic6x-c62x-linux.c"
+
+/* The offset from rt_sigframe pointer to SP register. */
+#define TIC6X_SP_RT_SIGFRAME 8
+/* Size of struct siginfo info. */
+#define TIC6X_SIGINFO_SIZE 128
+/* Size of type stack_t, which contains three fields of type void*, int, and
+ size_t respectively. */
+#define TIC6X_STACK_T_SIZE (3 * 4)
+
+const gdb_byte tic6x_bkpt_illegal_opcode_be[] = { 0x56, 0x45, 0x43, 0x14 };
+const gdb_byte tic6x_bkpt_illegal_opcode_le[] = { 0x14, 0x43, 0x45, 0x56 };
+
+static const gdb_byte tic6x_bkpt_bnop_be[] = { 0x00, 0x00, 0xa1, 0x22 };
+static const gdb_byte tic6x_bkpt_bnop_le[] = { 0x22, 0xa1, 0x00, 0x00 };
+
+/* Return the offset of register REGNUM in struct sigcontext. Return 0 if no
+ such register in sigcontext. */
+
+static unsigned int
+tic6x_register_sigcontext_offset (unsigned int regnum, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (regnum == TIC6X_A4_REGNUM || regnum == TIC6X_A4_REGNUM + 2
+ || regnum == TIC6X_A4_REGNUM + 4)
+ return 4 * (regnum - TIC6X_A4_REGNUM + 2); /* A4, A6, A8 */
+ else if (regnum == TIC6X_A5_REGNUM || regnum == TIC6X_A5_REGNUM + 2
+ || regnum == TIC6X_A5_REGNUM + 4)
+ return 4 * (regnum - TIC6X_A5_REGNUM + 12); /* A5, A7, A9 */
+ else if (regnum == TIC6X_B4_REGNUM || regnum == TIC6X_B4_REGNUM + 2
+ || regnum == TIC6X_B4_REGNUM + 4)
+ return 4 * (regnum - TIC6X_B4_REGNUM + 3); /* B4, B6, B8 */
+ else if (regnum == TIC6X_B5_REGNUM || regnum == TIC6X_B5_REGNUM + 2
+ || regnum == TIC6X_B5_REGNUM + 4)
+ return 4 * (regnum - TIC6X_B5_REGNUM + 19); /* B5, B7, B9 */
+ else if (regnum >= 0 && regnum < TIC6X_A4_REGNUM)
+ return 4 * (regnum - 0 + 8); /* A0 - A3 */
+ else if (regnum >= TIC6X_B0_REGNUM && regnum < TIC6X_B4_REGNUM)
+ return 4 * (regnum - TIC6X_B0_REGNUM + 15); /* B0 - B3 */
+ else if (regnum >= 34 && regnum < 34 + 32)
+ return 4 * (regnum - 34 + 23); /* A16 - A31, B16 - B31 */
+ else if (regnum == TIC6X_PC_REGNUM)
+ return 4 * (tdep->has_gp ? 55 : 23);
+ else if (regnum == TIC6X_SP_REGNUM)
+ return 4;
+
+ return 0;
+}
+
+/* Support unwinding frame in signal trampoline. We don't check sigreturn,
+ since it is not used in kernel. */
+
+static void
+tic6x_linux_rt_sigreturn_init (const struct tramp_frame *self,
+ struct frame_info *this_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM);
+ /* The base of struct sigcontext is computed by examining the definition of
+ struct rt_sigframe in linux kernel source arch/c6x/kernel/signal.c. */
+ CORE_ADDR base = (sp + TIC6X_SP_RT_SIGFRAME
+ /* Pointer type *pinfo and *puc in struct rt_sigframe. */
+ + 4 + 4
+ + TIC6X_SIGINFO_SIZE
+ + 4 + 4 /* uc_flags and *uc_link in struct ucontext. */
+ + TIC6X_STACK_T_SIZE);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ unsigned int reg_offset;
+ unsigned int i;
+
+ for (i = 0; i < 10; i++) /* A0 - A9 */
+ {
+ reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
+ gdb_assert (reg_offset != 0);
+
+ trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
+ }
+
+ for (i = TIC6X_B0_REGNUM; i < TIC6X_B0_REGNUM + 10; i++) /* B0 - B9 */
+ {
+ reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
+ gdb_assert (reg_offset != 0);
+
+ trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
+ }
+
+ if (tdep->has_gp)
+ for (i = 34; i < 34 + 32; i++) /* A16 - A31, B16 - B31 */
+ {
+ reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
+ gdb_assert (reg_offset != 0);
+
+ trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
+ }
+
+ trad_frame_set_reg_addr (this_cache, TIC6X_PC_REGNUM,
+ base + tic6x_register_sigcontext_offset (TIC6X_PC_REGNUM,
+ gdbarch));
+ trad_frame_set_reg_addr (this_cache, TIC6X_SP_REGNUM,
+ base + tic6x_register_sigcontext_offset (TIC6X_SP_REGNUM,
+ gdbarch));
+
+ /* Save a frame ID. */
+ trad_frame_set_id (this_cache, frame_id_build (sp, func));
+}
+
+static struct tramp_frame tic6x_linux_rt_sigreturn_tramp_frame =
+{
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ {0x000045aa, 0x0fffffff}, /* mvk .S2 139,b0 */
+ {0x10000000, -1}, /* swe */
+ {TRAMP_SENTINEL_INSN}
+ },
+ tic6x_linux_rt_sigreturn_init
+};
+
+/* When FRAME is at a syscall instruction, return the PC of the next
+ instruction to be executed. */
+
+static CORE_ADDR
+tic6x_linux_syscall_next_pc (struct frame_info *frame)
+{
+ ULONGEST syscall_number = get_frame_register_unsigned (frame,
+ TIC6X_B0_REGNUM);
+ CORE_ADDR pc = get_frame_pc (frame);
+
+ if (syscall_number == 139 /* rt_sigreturn */)
+ return frame_unwind_caller_pc (frame);
+
+ return pc + 4;
+}
+
+
+extern struct target_so_ops dsbt_so_ops;
+static void
+tic6x_uclinux_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_solib_ops (gdbarch, &dsbt_so_ops);
+
+ tdep->syscall_next_pc = tic6x_linux_syscall_next_pc;
+
+#ifdef HAVE_ELF
+ /* In tic6x Linux kernel, breakpoint instructions varies on different archs.
+ On C64x+ and C67x+, breakpoint instruction is 0x56454314, which is an
+ illegal opcode. On other arch, breakpoint instruction is 0x0000a122
+ (BNOP .S2 0,5). */
+ if (info.abfd)
+ switch (bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, Tag_ISA))
+ {
+ case C6XABI_Tag_ISA_C64XP:
+ case C6XABI_Tag_ISA_C67XP:
+ if (info.byte_order == BFD_ENDIAN_BIG)
+ tdep->breakpoint = tic6x_bkpt_illegal_opcode_be;
+ else
+ tdep->breakpoint = tic6x_bkpt_illegal_opcode_le;
+ break;
+ default:
+ {
+ if (info.byte_order == BFD_ENDIAN_BIG)
+ tdep->breakpoint = tic6x_bkpt_bnop_be;
+ else
+ tdep->breakpoint = tic6x_bkpt_bnop_le;
+ }
+ }
+#endif
+
+ /* Signal trampoline support. */
+ tramp_frame_prepend_unwinder (gdbarch,
+ &tic6x_linux_rt_sigreturn_tramp_frame);
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_tic6x_linux_tdep;
+
+void
+_initialize_tic6x_linux_tdep (void)
+{
+ gdbarch_register_osabi (bfd_arch_tic6x, 0, GDB_OSABI_LINUX,
+ tic6x_uclinux_init_abi);
+
+ initialize_tdesc_tic6x_c64xp_linux ();
+ initialize_tdesc_tic6x_c64x_linux ();
+ initialize_tdesc_tic6x_c62x_linux ();
+}
--- /dev/null
+/* Target dependent code for GDB on TI C6x systems.
+
+ Copyright (C) 2010, 2011.
+ Free Software Foundation, Inc.
+ Contributed by Andrew Jenner <andrew@codesourcery.com>
+ Contributed by Yao Qi <yao@codesourcery.com>
+
+ 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 "frame-unwind.h"
+#include "frame-base.h"
+#include "trad-frame.h"
+#include "dwarf2-frame.h"
+#include "symtab.h"
+#include "inferior.h"
+#include "gdbtypes.h"
+#include "gdbcore.h"
+#include "gdbcmd.h"
+#include "target.h"
+#include "dis-asm.h"
+#include "regcache.h"
+#include "value.h"
+#include "symfile.h"
+#include "arch-utils.h"
+#include "floatformat.h"
+#include "glibc-tdep.h"
+#include "infcall.h"
+#include "regset.h"
+#include "tramp-frame.h"
+#include "linux-tdep.h"
+#include "solib.h"
+#include "objfiles.h"
+#include "gdb_assert.h"
+#include "osabi.h"
+#include "tic6x-tdep.h"
+#include "language.h"
+#include "target-descriptions.h"
+
+#include "features/tic6x-c64xp.c"
+#include "features/tic6x-c64x.c"
+#include "features/tic6x-c62x.c"
+
+#define TIC6X_OPCODE_SIZE 4
+#define TIC6X_FETCH_PACKET_SIZE 32
+
+#define INST_S_BIT(INST) ((INST >> 1) & 1)
+#define INST_X_BIT(INST) ((INST >> 12) & 1)
+
+struct tic6x_unwind_cache
+{
+ /* The frame's base, optionally used by the high-level debug info. */
+ CORE_ADDR base;
+
+ /* The previous frame's inner most stack address. Used as this
+ frame ID's stack_addr. */
+ CORE_ADDR cfa;
+
+ /* The address of the first instruction in this function */
+ CORE_ADDR pc;
+
+ /* Which register holds the return address for the frame. */
+ int return_regnum;
+
+ /* The offset of register saved on stack. If register is not saved, the
+ corresponding element is -1. */
+ CORE_ADDR reg_saved[TIC6X_NUM_CORE_REGS];
+};
+
+
+/* Name of TI C6x core registers. */
+static const char *const tic6x_register_names[] =
+{
+ "A0", "A1", "A2", "A3", /* 0 1 2 3 */
+ "A4", "A5", "A6", "A7", /* 4 5 6 7 */
+ "A8", "A9", "A10", "A11", /* 8 9 10 11 */
+ "A12", "A13", "A14", "A15", /* 12 13 14 15 */
+ "B0", "B1", "B2", "B3", /* 16 17 18 19 */
+ "B4", "B5", "B6", "B7", /* 20 21 22 23 */
+ "B8", "B9", "B10", "B11", /* 24 25 26 27 */
+ "B12", "B13", "B14", "B15", /* 28 29 30 31 */
+ "CSR", "PC", /* 32 33 */
+};
+
+/* This array maps the arguments to the register number which passes argument
+ in function call according to C6000 ELF ABI. */
+static const int arg_regs[] = { 4, 20, 6, 22, 8, 24, 10, 26, 12, 28 };
+
+/* This is the implementation of gdbarch method register_name. */
+
+static const char *
+tic6x_register_name (struct gdbarch *gdbarch, int regno)
+{
+ if (regno < 0)
+ return NULL;
+
+ if (tdesc_has_registers (gdbarch_target_desc (gdbarch)))
+ return tdesc_register_name (gdbarch, regno);
+ else if (regno >= ARRAY_SIZE (tic6x_register_names))
+ return "";
+ else
+ return tic6x_register_names[regno];
+}
+
+/* This is the implementation of gdbarch method register_type. */
+
+static struct type *
+tic6x_register_type (struct gdbarch *gdbarch, int regno)
+{
+
+ if (regno == TIC6X_PC_REGNUM)
+ return builtin_type (gdbarch)->builtin_func_ptr;
+ else
+ return builtin_type (gdbarch)->builtin_uint32;
+}
+
+static void
+tic6x_setup_default (struct tic6x_unwind_cache *cache)
+{
+ int i;
+
+ for (i = 0; i < TIC6X_NUM_CORE_REGS; i++)
+ cache->reg_saved[i] = -1;
+}
+
+static unsigned long tic6x_fetch_instruction (struct gdbarch *, CORE_ADDR);
+static int tic6x_register_number (int reg, int side, int crosspath);
+
+/* Do a full analysis of the prologue at START_PC and update CACHE accordingly.
+ Bail out early if CURRENT_PC is reached. Returns the address of the first
+ instruction after the prologue. */
+
+CORE_ADDR
+tic6x_analyze_prologue (struct gdbarch *gdbarch, const CORE_ADDR start_pc,
+ const CORE_ADDR current_pc,
+ struct tic6x_unwind_cache *cache,
+ struct frame_info *this_frame)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ unsigned long inst;
+ unsigned int src_reg, base_reg, dst_reg;
+ int i;
+ CORE_ADDR pc = start_pc;
+ CORE_ADDR return_pc = start_pc;
+ int frame_base_offset_to_sp = 0;
+ /* Counter of non-stw instructions after first insn ` sub sp, xxx, sp'. */
+ int non_stw_insn_counter = 0;
+
+ if (start_pc >= current_pc)
+ return_pc = current_pc;
+
+ cache->base = 0;
+
+ /* The landmarks in prologue is one or two SUB instructions to SP.
+ Instructions on setting up dsbt are in the last part of prologue, if
+ needed. In maxim, prologue can be divided to three parts by two
+ `sub sp, xx, sp' insns. */
+
+ /* Step 1: Look for the 1st and 2nd insn `sub sp, xx, sp', in which, the
+ 2nd one is optional. */
+ while (pc < current_pc)
+ {
+ int offset = 0;
+
+ unsigned long inst = tic6x_fetch_instruction (gdbarch, pc);
+
+ if ((inst & 0x1ffc) == 0x1dc0 || (inst & 0x1ffc) == 0x1bc0
+ || (inst & 0x0ffc) == 0x9c0)
+ {
+ /* SUBAW/SUBAH/SUB, and src1 is ucst 5. */
+ unsigned int src2 = tic6x_register_number ((inst >> 18) & 0x1f,
+ INST_S_BIT (inst), 0);
+ unsigned int dst = tic6x_register_number ((inst >> 23) & 0x1f,
+ INST_S_BIT (inst), 0);
+
+ if (src2 == TIC6X_SP_REGNUM && dst == TIC6X_SP_REGNUM)
+ {
+ /* Extract const from insn SUBAW/SUBAH/SUB, and translate it to
+ offset. The constant offset is decoded in bit 13-17 in all
+ these three kinds of instructions. */
+ unsigned int ucst5 = (inst >> 13) & 0x1f;
+
+ if ((inst & 0x1ffc) == 0x1dc0) /* SUBAW */
+ frame_base_offset_to_sp += ucst5 << 2;
+ else if ((inst & 0x1ffc) == 0x1bc0) /* SUBAH */
+ frame_base_offset_to_sp += ucst5 << 1;
+ else if ((inst & 0x0ffc) == 0x9c0) /* SUB */
+ frame_base_offset_to_sp += ucst5;
+ else
+ gdb_assert_not_reached ("unexpected instruction");
+
+ return_pc = pc + 4;
+ }
+ }
+ else if ((inst & 0x174) == 0x74) /* stw SRC, *+b15(uconst) */
+ {
+ /* The y bit determines which file base is read from. */
+ base_reg = tic6x_register_number ((inst >> 18) & 0x1f,
+ (inst >> 7) & 1, 0);
+
+ if (base_reg == TIC6X_SP_REGNUM)
+ {
+ src_reg = tic6x_register_number ((inst >> 23) & 0x1f,
+ INST_S_BIT (inst), 0);
+
+ cache->reg_saved[src_reg] = ((inst >> 13) & 0x1f) << 2;
+
+ return_pc = pc + 4;
+ }
+ non_stw_insn_counter = 0;
+ }
+ else
+ {
+ non_stw_insn_counter++;
+ /* Following instruction sequence may be emitted in prologue:
+
+ <+0>: subah .D2 b15,28,b15
+ <+4>: or .L2X 0,a4,b0
+ <+8>: || stw .D2T2 b14,*+b15(56)
+ <+12>:[!b0] b .S1 0xe50e4c1c <sleep+220>
+ <+16>:|| stw .D2T1 a10,*+b15(48)
+ <+20>:stw .D2T2 b3,*+b15(52)
+ <+24>:stw .D2T1 a4,*+b15(40)
+
+ we should look forward for next instruction instead of breaking loop
+ here. So far, we allow almost two sequential non-stw instructions
+ in prologue. */
+ if (non_stw_insn_counter >= 2)
+ break;
+ }
+
+
+ pc += 4;
+ }
+ /* Step 2: Skip insn on setting up dsbt if it is. Usually, it looks like,
+ ldw .D2T2 *+b14(0),b14 */
+ inst = tic6x_fetch_instruction (gdbarch, pc);
+ /* The s bit determines which file dst will be loaded into, same effect as
+ other places. */
+ dst_reg = tic6x_register_number ((inst >> 23) & 0x1f, (inst >> 1) & 1, 0);
+ /* The y bit (bit 7), instead of s bit, determines which file base be
+ used. */
+ base_reg = tic6x_register_number ((inst >> 18) & 0x1f, (inst >> 7) & 1, 0);
+
+ if ((inst & 0x164) == 0x64 /* ldw */
+ && dst_reg == TIC6X_DP_REGNUM /* dst is B14 */
+ && base_reg == TIC6X_DP_REGNUM) /* baseR is B14 */
+ {
+ return_pc = pc + 4;
+ }
+
+ if (this_frame)
+ {
+ cache->base = get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM);
+
+ if (cache->reg_saved[TIC6X_FP_REGNUM] != -1)
+ {
+ /* If the FP now holds an offset from the CFA then this is a frame
+ which uses the frame pointer. */
+
+ cache->cfa = get_frame_register_unsigned (this_frame,
+ TIC6X_FP_REGNUM);
+ }
+ else
+ {
+ /* FP doesn't hold an offset from the CFA. If SP still holds an
+ offset from the CFA then we might be in a function which omits
+ the frame pointer. */
+
+ cache->cfa = cache->base + frame_base_offset_to_sp;
+ }
+ }
+
+ /* Adjust all the saved registers such that they contain addresses
+ instead of offsets. */
+ for (i = 0; i < TIC6X_NUM_CORE_REGS; i++)
+ if (cache->reg_saved[i] != -1)
+ cache->reg_saved[i] = cache->base + cache->reg_saved[i];
+
+ return return_pc;
+}
+
+/* This is the implementation of gdbarch method skip_prologue. */
+
+CORE_ADDR
+tic6x_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc)
+{
+ CORE_ADDR limit_pc;
+ CORE_ADDR func_addr;
+ struct tic6x_unwind_cache cache;
+
+ /* See if we can determine the end of the prologue via the symbol table.
+ If so, then return either PC, or the PC after the prologue, whichever is
+ greater. */
+ if (find_pc_partial_function (start_pc, NULL, &func_addr, NULL))
+ {
+ CORE_ADDR post_prologue_pc
+ = skip_prologue_using_sal (gdbarch, func_addr);
+ if (post_prologue_pc != 0)
+ return max (start_pc, post_prologue_pc);
+ }
+
+ /* Can't determine prologue from the symbol table, need to examine
+ instructions. */
+ return tic6x_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache,
+ NULL);
+}
+
+/* This is the implementation of gdbarch method breakpiont_from_pc. */
+
+const unsigned char*
+tic6x_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr,
+ int *bp_size)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ *bp_size = 4;
+
+ if (tdep == NULL || tdep->breakpoint == NULL)
+ {
+ if (BFD_ENDIAN_BIG == gdbarch_byte_order_for_code (gdbarch))
+ return tic6x_bkpt_illegal_opcode_be;
+ else
+ return tic6x_bkpt_illegal_opcode_le;
+ }
+ else
+ return tdep->breakpoint;
+}
+
+/* This is the implementation of gdbarch method print_insn. */
+
+static int
+tic6x_print_insn (bfd_vma memaddr, disassemble_info *info)
+{
+ return print_insn_tic6x (memaddr, info);
+}
+
+static void
+tic6x_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
+ struct dwarf2_frame_state_reg *reg,
+ struct frame_info *this_frame)
+{
+ /* Mark the PC as the destination for the return address. */
+ if (regnum == gdbarch_pc_regnum (gdbarch))
+ reg->how = DWARF2_FRAME_REG_RA;
+
+ /* Mark the stack pointer as the call frame address. */
+ else if (regnum == gdbarch_sp_regnum (gdbarch))
+ reg->how = DWARF2_FRAME_REG_CFA;
+
+ /* The above was taken from the default init_reg in dwarf2-frame.c
+ while the below is c6x specific. */
+
+ /* Callee save registers. The ABI designates A10-A15 and B10-B15 as
+ callee-save. */
+ else if ((regnum >= 10 && regnum <= 15) || (regnum >= 26 && regnum <= 31))
+ reg->how = DWARF2_FRAME_REG_SAME_VALUE;
+ else
+ /* All other registers are caller-save. */
+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
+}
+
+/* This is the implementation of gdbarch method unwind_pc. */
+
+static CORE_ADDR
+tic6x_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ gdb_byte buf[8];
+
+ frame_unwind_register (next_frame, TIC6X_PC_REGNUM, buf);
+ return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr);
+}
+
+/* This is the implementation of gdbarch method unwind_sp. */
+
+static CORE_ADDR
+tic6x_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+ return frame_unwind_register_unsigned (this_frame, TIC6X_SP_REGNUM);
+}
+
+
+/* Frame base handling. */
+
+struct tic6x_unwind_cache*
+tic6x_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ CORE_ADDR current_pc;
+ struct tic6x_unwind_cache *cache;
+ int i;
+
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct tic6x_unwind_cache);
+ (*this_prologue_cache) = cache;
+
+ cache->return_regnum = TIC6X_RA_REGNUM;
+
+ tic6x_setup_default (cache);
+
+ cache->pc = get_frame_func (this_frame);
+ current_pc = get_frame_pc (this_frame);
+
+ /* Prologue analysis does the rest... */
+ if (cache->pc != 0)
+ tic6x_analyze_prologue (gdbarch, cache->pc, current_pc, cache, this_frame);
+
+ return cache;
+}
+
+static void
+tic6x_frame_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct tic6x_unwind_cache *cache =
+ tic6x_frame_unwind_cache (this_frame, this_cache);
+
+ /* This marks the outermost frame. */
+ if (cache->base == 0)
+ return;
+
+ (*this_id) = frame_id_build (cache->cfa, cache->pc);
+}
+
+static struct value *
+tic6x_frame_prev_register (struct frame_info *this_frame, void **this_cache,
+ int regnum)
+{
+ struct tic6x_unwind_cache *cache =
+ tic6x_frame_unwind_cache (this_frame, this_cache);
+
+ gdb_assert (regnum >= 0);
+
+ /* The PC of the previous frame is stored in the RA register of
+ the current frame. Frob regnum so that we pull the value from
+ the correct place. */
+ if (regnum == TIC6X_PC_REGNUM)
+ regnum = cache->return_regnum;
+
+ if (regnum == TIC6X_SP_REGNUM && cache->cfa)
+ return frame_unwind_got_constant (this_frame, regnum, cache->cfa);
+
+ /* If we've worked out where a register is stored then load it from
+ there. */
+ if (regnum < TIC6X_NUM_CORE_REGS && cache->reg_saved[regnum] != -1)
+ return frame_unwind_got_memory (this_frame, regnum,
+ cache->reg_saved[regnum]);
+
+ return frame_unwind_got_register (this_frame, regnum, regnum);
+}
+
+static CORE_ADDR
+tic6x_frame_base_address (struct frame_info *this_frame, void **this_cache)
+{
+ struct tic6x_unwind_cache *info
+ = tic6x_frame_unwind_cache (this_frame, this_cache);
+ return info->base;
+}
+
+static const struct frame_unwind tic6x_frame_unwind =
+{
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ tic6x_frame_this_id,
+ tic6x_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
+
+static const struct frame_base tic6x_frame_base =
+{
+ &tic6x_frame_unwind,
+ tic6x_frame_base_address,
+ tic6x_frame_base_address,
+ tic6x_frame_base_address
+};
+
+
+static struct tic6x_unwind_cache *
+tic6x_make_stub_cache (struct frame_info *this_frame)
+{
+ struct tic6x_unwind_cache *cache;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct tic6x_unwind_cache);
+
+ cache->return_regnum = TIC6X_RA_REGNUM;
+
+ tic6x_setup_default (cache);
+
+ cache->cfa = get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM);
+
+ return cache;
+}
+
+static void
+tic6x_stub_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct tic6x_unwind_cache *cache;
+
+ if (*this_cache == NULL)
+ *this_cache = tic6x_make_stub_cache (this_frame);
+ cache = *this_cache;
+
+ *this_id = frame_id_build (cache->cfa, get_frame_pc (this_frame));
+}
+
+static int
+tic6x_stub_unwind_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ CORE_ADDR addr_in_block;
+
+ addr_in_block = get_frame_address_in_block (this_frame);
+ if (in_plt_section (addr_in_block, NULL))
+ return 1;
+
+ return 0;
+}
+
+static const struct frame_unwind tic6x_stub_unwind =
+{
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ tic6x_stub_this_id,
+ tic6x_frame_prev_register,
+ NULL,
+ tic6x_stub_unwind_sniffer
+};
+
+/* Return the instruction on address PC. */
+
+static unsigned long
+tic6x_fetch_instruction (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ return read_memory_unsigned_integer (pc, TIC6X_OPCODE_SIZE, byte_order);
+}
+
+/* Compute the condition of INST if it is a conditional instruction. Always
+ return 1 if INST is not a conditional instruction. */
+
+static int
+tic6x_condition_true (struct frame_info *frame, unsigned long inst)
+{
+ int register_number;
+ int register_value;
+ static const int register_numbers[8] = { -1, 16, 17, 18, 1, 2, 0, -1 };
+
+ register_number = register_numbers[(inst >> 29) & 7];
+ if (register_number == -1)
+ return 1;
+
+ register_value = get_frame_register_signed (frame, register_number);
+ if ((inst & 0x10000000) != 0)
+ return register_value == 0;
+ return register_value != 0;
+}
+
+/* Get the register number by decoding raw bits REG, SIDE, and CROSSPATH in
+ instruction. */
+
+static int
+tic6x_register_number (int reg, int side, int crosspath)
+{
+ int r = (reg & 15) | ((crosspath ^ side) << 4);
+ if ((reg & 16) != 0) /* A16 - A31, B16 - B31 */
+ r += 37;
+ return r;
+}
+
+static int
+tic6x_extract_signed_field (int value, int low_bit, int bits)
+{
+ int mask = (1 << bits) - 1;
+ int r = (value >> low_bit) & mask;
+ if ((r & (1 << (bits - 1))) != 0)
+ r -= mask + 1;
+ return r;
+}
+
+/* Determine where to set a single step breakpoint. */
+
+static CORE_ADDR
+tic6x_get_next_pc (struct frame_info *frame, CORE_ADDR pc)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ unsigned long inst;
+ int offset;
+ int register_number;
+ int last = 0;
+
+ do
+ {
+ inst = tic6x_fetch_instruction (gdbarch, pc);
+
+ last = !(inst & 1);
+
+ if (inst == TIC6X_INST_SWE)
+ {
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (tdep->syscall_next_pc != NULL)
+ return tdep->syscall_next_pc (frame);
+ }
+
+ if (tic6x_condition_true (frame, inst))
+ {
+ if ((inst & 0x0000007c) == 0x00000010)
+ {
+ /* B with displacement */
+ pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1);
+ pc += tic6x_extract_signed_field (inst, 7, 21) << 2;
+ break;
+ }
+ if ((inst & 0x0f83effc) == 0x00000360)
+ {
+ /* B with register */
+
+ register_number = tic6x_register_number ((inst >> 18) & 0x1f,
+ INST_S_BIT (inst),
+ INST_X_BIT (inst));
+ pc = get_frame_register_unsigned (frame, register_number);
+ break;
+ }
+ if ((inst & 0x00001ffc) == 0x00001020)
+ {
+ /* BDEC */
+ register_number = tic6x_register_number ((inst >> 23) & 0x1f,
+ INST_S_BIT (inst), 0);
+ if (get_frame_register_signed (frame, register_number) >= 0)
+ {
+ pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1);
+ pc += tic6x_extract_signed_field (inst, 7, 10) << 2;
+ }
+ break;
+ }
+ if ((inst & 0x00001ffc) == 0x00000120)
+ {
+ /* BNOP with displacement */
+ pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1);
+ pc += tic6x_extract_signed_field (inst, 16, 12) << 2;
+ break;
+ }
+ if ((inst & 0x0f830ffe) == 0x00800362)
+ {
+ /* BNOP with register */
+ register_number = tic6x_register_number ((inst >> 18) & 0x1f,
+ 1, INST_X_BIT (inst));
+ pc = get_frame_register_unsigned (frame, register_number);
+ break;
+ }
+ if ((inst & 0x00001ffc) == 0x00000020)
+ {
+ /* BPOS */
+ register_number = tic6x_register_number ((inst >> 23) & 0x1f,
+ INST_S_BIT (inst), 0);
+ if (get_frame_register_signed (frame, register_number) >= 0)
+ {
+ pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1);
+ pc += tic6x_extract_signed_field (inst, 13, 10) << 2;
+ }
+ break;
+ }
+ if ((inst & 0xf000007c) == 0x10000010)
+ {
+ /* CALLP */
+ pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1);
+ pc += tic6x_extract_signed_field (inst, 7, 21) << 2;
+ break;
+ }
+ }
+ pc += TIC6X_OPCODE_SIZE;
+ }
+ while (!last);
+ return pc;
+}
+
+/* This is the implementation of gdbarch method software_single_step. */
+
+int
+tic6x_software_single_step (struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct address_space *aspace = get_frame_address_space (frame);
+ CORE_ADDR next_pc = tic6x_get_next_pc (frame, get_frame_pc (frame));
+
+ insert_single_step_breakpoint (gdbarch, aspace, next_pc);
+
+ return 1;
+}
+
+/* This is the implementation of gdbarch method frame_align. */
+
+static CORE_ADDR
+tic6x_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
+{
+ return align_down (addr, 8);
+}
+
+/* This is the implementation of gdbarch method register_to_value. */
+
+static int
+tic6x_register_to_value (struct frame_info *frame, int regnum,
+ struct type *type, gdb_byte * to,
+ int *optimizedp, int *unavailablep)
+{
+ get_frame_register (frame, regnum, (char *) to);
+ *optimizedp = *unavailablep = 0;
+ return 1;
+}
+
+/* This is the implementation of gdbarch method value_to_register. */
+
+static void
+tic6x_value_to_register (struct frame_info *frame, int regnum,
+ struct type *type, const gdb_byte *from)
+{
+ put_frame_register (frame, regnum, from);
+}
+
+/* Given a return value in REGCACHE with a type VALTYPE, extract and copy its
+ value into VALBUF. */
+
+static void
+tic6x_extract_return_value (struct type *valtype, struct regcache *regcache,
+ enum bfd_endian byte_order, gdb_byte *valbuf)
+{
+ int len = TYPE_LENGTH (valtype);
+
+ /* pointer types are returned in register A4,
+ up to 32-bit types in A4
+ up to 64-bit types in A5:A4 */
+ if (len <= 4)
+ {
+ /* In big-endian,
+ - one-byte structure or union occupies the LSB of single even register.
+ - for two-byte structure or union, the first byte occupies byte 1 of
+ register and the second byte occupies byte 0.
+ so, we read the contents in VAL from the LSBs of register. */
+ if (len < 3 && byte_order == BFD_ENDIAN_BIG)
+ regcache_cooked_read_part (regcache, TIC6X_A4_REGNUM, 4 - len, len,
+ valbuf);
+ else
+ regcache_cooked_read (regcache, TIC6X_A4_REGNUM, valbuf);
+ }
+ else if (len <= 8)
+ {
+ /* For a 5-8 byte structure or union in big-endian, the first byte
+ occupies byte 3 (the MSB) of the upper (odd) register and the
+ remaining bytes fill the decreasingly significant bytes. 5-7
+ byte structures or unions have padding in the LSBs of the
+ lower (even) register. */
+ if (byte_order == BFD_ENDIAN_BIG)
+ {
+ regcache_cooked_read (regcache, TIC6X_A4_REGNUM, valbuf + 4);
+ regcache_cooked_read (regcache, TIC6X_A5_REGNUM, valbuf);
+ }
+ else
+ {
+ regcache_cooked_read (regcache, TIC6X_A4_REGNUM, valbuf);
+ regcache_cooked_read (regcache, TIC6X_A5_REGNUM, valbuf + 4);
+ }
+ }
+}
+
+/* Write into appropriate registers a function return value
+ of type TYPE, given in virtual format. */
+
+static void
+tic6x_store_return_value (struct type *valtype, struct regcache *regcache,
+ enum bfd_endian byte_order, const gdb_byte *valbuf)
+{
+ int len = TYPE_LENGTH (valtype);
+
+ /* return values of up to 8 bytes are returned in A5:A4 */
+
+ if (len <= 4)
+ {
+ if (len < 3 && byte_order == BFD_ENDIAN_BIG)
+ regcache_cooked_write_part (regcache, TIC6X_A4_REGNUM, 4 - len, len,
+ valbuf);
+ else
+ regcache_cooked_write (regcache, TIC6X_A4_REGNUM, valbuf);
+ }
+ else if (len <= 8)
+ {
+ if (byte_order == BFD_ENDIAN_BIG)
+ {
+ regcache_cooked_write (regcache, TIC6X_A4_REGNUM, valbuf + 4);
+ regcache_cooked_write (regcache, TIC6X_A5_REGNUM, valbuf);
+ }
+ else
+ {
+ regcache_cooked_write (regcache, TIC6X_A4_REGNUM, valbuf);
+ regcache_cooked_write (regcache, TIC6X_A5_REGNUM, valbuf + 4);
+ }
+ }
+}
+
+/* This is the implementation of gdbarch method return_value. */
+
+static enum return_value_convention
+tic6x_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ if (TYPE_LENGTH (type) > 8)
+ return RETURN_VALUE_STRUCT_CONVENTION;
+
+ if (readbuf)
+ tic6x_extract_return_value (type, regcache,
+ gdbarch_byte_order (gdbarch), readbuf);
+ if (writebuf)
+ tic6x_store_return_value (type, regcache,
+ gdbarch_byte_order (gdbarch), writebuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
+/* This is the implementation of gdbarch method dummy_id. */
+
+static struct frame_id
+tic6x_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+ return frame_id_build
+ (get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM),
+ get_frame_pc (this_frame));
+}
+
+/* Get the alignment requirement of TYPE. */
+
+static int
+tic6x_arg_type_alignment (struct type *type)
+{
+ int len = TYPE_LENGTH (check_typedef (type));
+ enum type_code typecode = TYPE_CODE (check_typedef (type));
+
+ if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)
+ {
+ /* The stack alignment of a structure (and union) passed by value is the
+ smallest power of two greater than or equal to its size.
+ This cannot exceed 8 bytes, which is the largest allowable size for
+ a structure passed by value. */
+
+ if (len <= 2)
+ return len;
+ else if (len <= 4)
+ return 4;
+ else if (len <= 8)
+ return 8;
+ else
+ gdb_assert_not_reached ("unexpected length of data");
+ }
+ else
+ {
+ if (len <= 4)
+ return 4;
+ else if (len == 8)
+ {
+ if (typecode == TYPE_CODE_COMPLEX)
+ return 4;
+ else
+ return 8;
+ }
+ else if (len == 16)
+ {
+ if (typecode == TYPE_CODE_COMPLEX)
+ return 8;
+ else
+ return 16;
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("unexpected length %d of type"),
+ len);
+ }
+}
+
+/* This is the implementation of gdbarch method push_dummy_call. */
+
+static CORE_ADDR
+tic6x_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr,
+ int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
+{
+ int argreg = 0;
+ int argnum;
+ int len = 0;
+ int stack_offset = 4;
+ int references_offset = 4;
+ CORE_ADDR func_addr = find_function_addr (function, NULL);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct type *func_type = value_type (function);
+ /* The first arg passed on stack. Mostly the first 10 args are passed by
+ registers. */
+ int first_arg_on_stack = 10;
+ /* If this inf-call is a cpp method call, and return value is passed by
+ reference, this flag is set to 1, otherwise set to 0. We need this flag
+ because computation of the return location in
+ infcall.c:call_function_by_hand is wrong for C6000 ELF ABI. In
+ call_function_by_hand, the language is considered first, and then
+ target ABI is considered. If language_pass_by_reference returns true,
+ the return location is passed as the first parameter to the function,
+ which is conflict with C6000 ELF ABI. If this flag is true, we should
+ adjust args and return locations accordingly to comply with C6000 ELF
+ ABI. */
+ int cplus_return_struct_by_reference = 0;
+
+ if (current_language->la_language == language_cplus)
+ {
+ struct type *values_type;
+
+ find_function_addr (function, &values_type);
+
+ if (values_type)
+ {
+ CHECK_TYPEDEF (values_type);
+ if (language_pass_by_reference (values_type))
+ cplus_return_struct_by_reference = 1;
+ }
+
+ }
+ /* Set the return address register to point to the entry point of
+ the program, where a breakpoint lies in wait. */
+ regcache_cooked_write_unsigned (regcache, TIC6X_RA_REGNUM, bp_addr);
+
+ /* The caller must pass an argument in A3 containing a destination address
+ for the returned value. The callee returns the object by copying it to
+ the address in A3. */
+ if (struct_return)
+ regcache_cooked_write_unsigned (regcache, 3, struct_addr);
+ else if (cplus_return_struct_by_reference)
+ /* When cplus_return_struct_by_reference is 1, means local variable
+ lang_struct_return in call_function_by_hand is 1, so struct is
+ returned by reference, even STRUCT_RETURN is 0. Note that STRUCT_ADDR
+ is still valid in this case. */
+ regcache_cooked_write_unsigned (regcache, 3, struct_addr);
+
+ /* Determine the type of this function. */
+ func_type = check_typedef (func_type);
+ if (TYPE_CODE (func_type) == TYPE_CODE_PTR)
+ func_type = check_typedef (TYPE_TARGET_TYPE (func_type));
+
+ gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC
+ || TYPE_CODE (func_type) == TYPE_CODE_METHOD);
+
+ /* For a variadic C function, the last explicitly declared argument and all
+ remaining arguments are passed on the stack. */
+ if (TYPE_VARARGS (func_type))
+ first_arg_on_stack = TYPE_NFIELDS (func_type) - 1;
+
+ /* Now make space on the stack for the args. If
+ cplus_return_struct_by_reference is 1, means GDB pass an extra parameter
+ in ARGS, which is useless here, skip it. */
+ for (argnum = cplus_return_struct_by_reference; argnum < nargs; argnum++)
+ {
+ int len = align_up (TYPE_LENGTH (value_type (args[argnum])), 4);
+ if (argnum >= 10 - argreg)
+ references_offset += len;
+ stack_offset += len;
+ }
+ sp -= stack_offset;
+ /* SP should be 8-byte aligned, see C6000 ABI section 4.4.1
+ Stack Alignment. */
+ sp = align_down (sp, 8);
+ stack_offset = 4;
+
+ /* Now load as many as possible of the first arguments into
+ registers, and push the rest onto the stack. Loop through args
+ from first to last. */
+ for (argnum = cplus_return_struct_by_reference; argnum < nargs; argnum++)
+ {
+ const gdb_byte *val;
+ struct value *arg = args[argnum];
+ struct type *arg_type = check_typedef (value_type (arg));
+ int len = TYPE_LENGTH (arg_type);
+ enum type_code typecode = TYPE_CODE (arg_type);
+
+ val = value_contents (arg);
+
+ /* Copy the argument to general registers or the stack in
+ register-sized pieces. */
+ if (argreg < first_arg_on_stack)
+ {
+ if (len <= 4)
+ {
+ if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)
+ {
+ /* In big-endian,
+ - one-byte structure or union occupies the LSB of single
+ even register.
+ - for two-byte structure or union, the first byte
+ occupies byte 1 of register and the second byte occupies
+ byte 0.
+ so, we write the contents in VAL to the lsp of
+ register. */
+ if (len < 3 && byte_order == BFD_ENDIAN_BIG)
+ regcache_cooked_write_part (regcache, arg_regs[argreg],
+ 4 - len, len, val);
+ else
+ regcache_cooked_write (regcache, arg_regs[argreg], val);
+ }
+ else
+ {
+ /* The argument is being passed by value in a single
+ register. */
+ CORE_ADDR regval = extract_unsigned_integer (val, len,
+ byte_order);
+
+ regcache_cooked_write_unsigned (regcache, arg_regs[argreg],
+ regval);
+ }
+ }
+ else
+ {
+ if (len <= 8)
+ {
+ if (typecode == TYPE_CODE_STRUCT
+ || typecode == TYPE_CODE_UNION)
+ {
+ /* For a 5-8 byte structure or union in big-endian, the
+ first byte occupies byte 3 (the MSB) of the upper (odd)
+ register and the remaining bytes fill the decreasingly
+ significant bytes. 5-7 byte structures or unions have
+ padding in the LSBs of the lower (even) register. */
+ if (byte_order == BFD_ENDIAN_BIG)
+ {
+ regcache_cooked_write (regcache,
+ arg_regs[argreg] + 1, val);
+ regcache_cooked_write_part (regcache,
+ arg_regs[argreg], 0,
+ len - 4, val + 4);
+ }
+ else
+ {
+ regcache_cooked_write (regcache, arg_regs[argreg],
+ val);
+ regcache_cooked_write_part (regcache,
+ arg_regs[argreg] + 1, 0,
+ len - 4, val + 4);
+ }
+ }
+ else
+ {
+ /* The argument is being passed by value in a pair of
+ registers. */
+ ULONGEST regval = extract_unsigned_integer (val, len,
+ byte_order);
+
+ regcache_cooked_write_unsigned (regcache,
+ arg_regs[argreg],
+ regval);
+ regcache_cooked_write_unsigned (regcache,
+ arg_regs[argreg] + 1,
+ regval >> 32);
+ }
+ }
+ else
+ {
+ /* The argument is being passed by reference in a single
+ register. */
+ CORE_ADDR addr;
+
+ /* It is not necessary to adjust REFERENCES_OFFSET to
+ 8-byte aligned in some cases, in which 4-byte alignment
+ is sufficient. For simplicity, we adjust
+ REFERENCES_OFFSET to 8-byte aligned. */
+ references_offset = align_up (references_offset, 8);
+
+ addr = sp + references_offset;
+ write_memory (addr, val, len);
+ references_offset += align_up (len, 4);
+ regcache_cooked_write_unsigned (regcache, arg_regs[argreg],
+ addr);
+ }
+ }
+ argreg++;
+ }
+ else
+ {
+ /* The argument is being passed on the stack. */
+ CORE_ADDR addr;
+
+ /* There are six different cases of alignment, and these rules can
+ be found in tic6x_arg_type_alignment:
+
+ 1) 4-byte aligned if size is less than or equal to 4 byte, such
+ as short, int, struct, union etc.
+ 2) 8-byte aligned if size is less than or equal to 8-byte, such
+ as double, long long,
+ 3) 4-byte aligned if it is of type _Complex float, even its size
+ is 8-byte.
+ 4) 8-byte aligned if it is of type _Complex double or _Complex
+ long double, even its size is 16-byte. Because, the address of
+ variable is passed as reference.
+ 5) struct and union larger than 8-byte are passed by reference, so
+ it is 4-byte aligned.
+ 6) struct and union of size between 4 byte and 8 byte varies.
+ alignment of struct variable is the alignment of its first field,
+ while alignment of union variable is the max of all its fields'
+ alignment. */
+
+ if (len <= 4)
+ ; /* Default is 4-byte aligned. Nothing to be done. */
+ else if (len <= 8)
+ stack_offset = align_up (stack_offset,
+ tic6x_arg_type_alignment (arg_type));
+ else if (len == 16)
+ {
+ /* _Complex double or _Complex long double */
+ if (typecode == TYPE_CODE_COMPLEX)
+ {
+ /* The argument is being passed by reference on stack. */
+ CORE_ADDR addr;
+ references_offset = align_up (references_offset, 8);
+
+ addr = sp + references_offset;
+ /* Store variable on stack. */
+ write_memory (addr, val, len);
+
+ references_offset += align_up (len, 4);
+
+ /* Pass the address of variable on stack as reference. */
+ store_unsigned_integer ((gdb_byte *) val, 4, byte_order,
+ addr);
+ len = 4;
+
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("unexpected type %d of arg %d"),
+ typecode, argnum);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("unexpected length %d of arg %d"), len, argnum);
+
+ addr = sp + stack_offset;
+ write_memory (addr, val, len);
+ stack_offset += align_up (len, 4);
+ }
+ }
+
+ regcache_cooked_write_signed (regcache, TIC6X_SP_REGNUM, sp);
+
+ /* Return adjusted stack pointer. */
+ return sp;
+}
+
+/* This is the implementation of gdbarch method in_function_epilogue_p. */
+
+static int
+tic6x_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ unsigned long inst = tic6x_fetch_instruction (gdbarch, pc);
+ /* Normally, the epilogue is composed by instruction `b .S2 b3'. */
+ if ((inst & 0x0f83effc) == 0x360)
+ {
+ unsigned int src2 = tic6x_register_number ((inst >> 18) & 0x1f,
+ INST_S_BIT (inst),
+ INST_X_BIT (inst));
+ if (src2 == TIC6X_RA_REGNUM)
+ return 1;
+ }
+
+ return 0;
+}
+
+/* This is the implementation of gdbarch method get_longjmp_target. */
+
+static int
+tic6x_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR jb_addr;
+ char buf[4];
+
+ /* JMP_BUF is passed by reference in A4. */
+ jb_addr = get_frame_register_unsigned (frame, 4);
+
+ /* JMP_BUF contains 13 elements of type int, and return address is stored
+ in the last slot. */
+ if (target_read_memory (jb_addr + 12 * 4, buf, 4))
+ return 0;
+
+ *pc = extract_unsigned_integer (buf, 4, byte_order);
+
+ return 1;
+}
+
+static struct gdbarch *
+tic6x_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch *gdbarch;
+ struct gdbarch_tdep *tdep;
+ struct tdesc_arch_data *tdesc_data = NULL;
+ const struct target_desc *tdesc = info.target_desc;
+ int has_gp = 0;
+
+ /* Check any target description for validity. */
+ if (tdesc_has_registers (tdesc))
+ {
+ const struct tdesc_feature *feature;
+ int valid_p, i;
+
+ feature = tdesc_find_feature (tdesc, "org.gnu.gdb.tic6x.core");
+
+ if (feature == NULL)
+ return NULL;
+
+ tdesc_data = tdesc_data_alloc ();
+
+ valid_p = 1;
+ for (i = 0; i < 32; i++) /* A0 - A15, B0 - B15 */
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
+ tic6x_register_names[i]);
+
+ /* CSR */
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i++,
+ tic6x_register_names[TIC6X_CSR_REGNUM]);
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i++,
+ tic6x_register_names[TIC6X_PC_REGNUM]);
+
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+
+ feature = tdesc_find_feature (tdesc, "org.gnu.gdb.tic6x.gp");
+ if (feature)
+ {
+ int j = 0;
+ static const char *const gp[] =
+ {
+ "A16", "A17", "A18", "A19", "A20", "A21", "A22", "A23",
+ "A24", "A25", "A26", "A27", "A28", "A29", "A30", "A31",
+ "B16", "B17", "B18", "B19", "B20", "B21", "B22", "B23",
+ "B24", "B25", "B26", "B27", "B28", "B29", "B30", "B31",
+ };
+
+ has_gp = 1;
+ valid_p = 1;
+ for (j = 0; j < 32; j++) /* A16 - A31, B16 - B31 */
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i++,
+ gp[j]);
+
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+ }
+
+ feature = tdesc_find_feature (tdesc, "org.gnu.gdb.tic6x.c6xp");
+ if (feature)
+ {
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i++, "TSR");
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i++, "ILC");
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i++, "RILC");
+
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+ }
+
+ }
+
+ /* Find a candidate among extant architectures. */
+ for (arches = gdbarch_list_lookup_by_info (arches, &info);
+ arches != NULL;
+ arches = gdbarch_list_lookup_by_info (arches->next, &info))
+ {
+ tdep = gdbarch_tdep (arches->gdbarch);
+
+ if (has_gp != tdep->has_gp)
+ continue;
+
+ if (tdep && tdep->breakpoint)
+ return arches->gdbarch;
+ }
+
+ tdep = xcalloc (1, sizeof (struct gdbarch_tdep));
+
+ tdep->has_gp = has_gp;
+ gdbarch = gdbarch_alloc (&info, tdep);
+
+ /* Data type sizes. */
+ set_gdbarch_ptr_bit (gdbarch, 32);
+ set_gdbarch_addr_bit (gdbarch, 32);
+ set_gdbarch_short_bit (gdbarch, 16);
+ set_gdbarch_int_bit (gdbarch, 32);
+ set_gdbarch_long_bit (gdbarch, 32);
+ set_gdbarch_long_long_bit (gdbarch, 64);
+ set_gdbarch_float_bit (gdbarch, 32);
+ set_gdbarch_double_bit (gdbarch, 64);
+
+ set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
+ set_gdbarch_double_format (gdbarch, floatformats_ieee_double);
+
+ /* The register set. */
+ set_gdbarch_num_regs (gdbarch, TIC6X_NUM_REGS);
+ set_gdbarch_sp_regnum (gdbarch, TIC6X_SP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, TIC6X_PC_REGNUM);
+
+ set_gdbarch_register_name (gdbarch, tic6x_register_name);
+ set_gdbarch_register_type (gdbarch, tic6x_register_type);
+
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+
+ set_gdbarch_skip_prologue (gdbarch, tic6x_skip_prologue);
+ set_gdbarch_breakpoint_from_pc (gdbarch, tic6x_breakpoint_from_pc);
+
+ set_gdbarch_unwind_pc (gdbarch, tic6x_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, tic6x_unwind_sp);
+
+ /* Unwinding. */
+ dwarf2_append_unwinders (gdbarch);
+
+ frame_unwind_append_unwinder (gdbarch, &tic6x_stub_unwind);
+ frame_unwind_append_unwinder (gdbarch, &tic6x_frame_unwind);
+
+ dwarf2_frame_set_init_reg (gdbarch, tic6x_dwarf2_frame_init_reg);
+
+ /* Single stepping. */
+ set_gdbarch_software_single_step (gdbarch, tic6x_software_single_step);
+
+ set_gdbarch_print_insn (gdbarch, tic6x_print_insn);
+
+ /* Call dummy code. */
+ set_gdbarch_frame_align (gdbarch, tic6x_frame_align);
+
+ set_gdbarch_register_to_value (gdbarch, tic6x_register_to_value);
+ set_gdbarch_value_to_register (gdbarch, tic6x_value_to_register);
+
+ set_gdbarch_return_value (gdbarch, tic6x_return_value);
+
+ set_gdbarch_dummy_id (gdbarch, tic6x_dummy_id);
+
+ /* Enable inferior call support. */
+ set_gdbarch_push_dummy_call (gdbarch, tic6x_push_dummy_call);
+
+ set_gdbarch_get_longjmp_target (gdbarch, tic6x_get_longjmp_target);
+
+ set_gdbarch_in_function_epilogue_p (gdbarch, tic6x_in_function_epilogue_p);
+
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
+
+ if (tdesc_data)
+ tdesc_use_registers (gdbarch, tdesc, tdesc_data);
+
+ return gdbarch;
+}
+
+void
+_initialize_tic6x_tdep (void)
+{
+ register_gdbarch_init (bfd_arch_tic6x, tic6x_gdbarch_init);
+
+ initialize_tdesc_tic6x_c64xp ();
+ initialize_tdesc_tic6x_c64x ();
+ initialize_tdesc_tic6x_c62x ();
+}
--- /dev/null
+/* GNU/Linux on TI C6x target support.
+ Copyright (C) 2011
+ Free Software Foundation, Inc.
+ Contributed by Yao Qi <yao@codesourcery.com>
+
+ 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/>. */
+
+enum
+{
+ TIC6X_A4_REGNUM = 4,
+ TIC6X_A5_REGNUM = 5,
+ TIC6X_FP_REGNUM = 15, /* Frame Pointer: A15 */
+ TIC6X_B0_REGNUM = 16,
+ TIC6X_RA_REGNUM = 19, /* Return address: B3 */
+ TIC6X_B4_REGNUM = 20,
+ TIC6X_B5_REGNUM = 21,
+ TIC6X_DP_REGNUM = 30, /* Data Page Pointer: B14 */
+ TIC6X_SP_REGNUM = 31, /* Stack Pointer: B15 */
+ TIC6X_CSR_REGNUM = 32,
+ TIC6X_PC_REGNUM = 33,
+ TIC6X_NUM_CORE_REGS = 33, /* The number of core registers */
+ TIC6X_RILC_REGNUM = 68,
+ TIC6X_NUM_REGS /* The number of registers */
+};
+
+#define TIC6X_INST_SWE 0x10000000
+
+extern const gdb_byte tic6x_bkpt_illegal_opcode_be[];
+extern const gdb_byte tic6x_bkpt_illegal_opcode_le[];
+
+/* Target-dependent structure in gdbarch. */
+struct gdbarch_tdep
+{
+ /* Return the expected next PC if FRAME is stopped at a syscall
+ instruction. */
+ CORE_ADDR (*syscall_next_pc) (struct frame_info *frame);
+
+ const char *breakpoint; /* Breakpoint instruction. */
+
+ int has_gp; /* Has general purpose registers A16 - A31 and B16 - B31. */
+};
projects / platform / upstream / binutils.git / commitdiff