#include "elf-internal.h"
#include "elf-external.h"
+#ifdef HAVE_PROCFS /* Some core file support requires host /proc files */
+#include <sys/procfs.h>
+#else
+#define bfd_prstatus(abfd, descdata, descsz, filepos) /* Define away */
+#define bfd_fpregset(abfd, descdata, descsz, filepos) /* Define away */
+#define bfd_prpsinfo(abfd, descdata, descsz, filepos) /* Define away */
+#endif
+
/* Forward data declarations */
+
extern bfd_target elf_little_vec, elf_big_vec;
+/* Currently the elf_symbol_type struct just contains the generic bfd
+ symbol structure. */
+
+typedef struct
+{
+ asymbol symbol;
+} elf_symbol_type;
+
+/* Some private data is stashed away for future use using the tdata pointer
+ in the bfd structure. This information is different for ELF core files
+ and other ELF files. */
+
+typedef struct
+{
+ void *prstatus; /* The raw /proc prstatus structure */
+ void *prpsinfo; /* The raw /proc prpsinfo structure */
+} elf_core_tdata;
+
+#define core_prpsinfo(bfd) (((elf_core_tdata *)((bfd)->tdata))->prpsinfo)
+#define core_prstatus(bfd) (((elf_core_tdata *)((bfd)->tdata))->prstatus)
+
+typedef struct
+{
+ file_ptr symtab_filepos; /* Offset to start of ELF symtab section */
+ long symtab_filesz; /* Size of ELF symtab section */
+ file_ptr strtab_filepos; /* Offset to start of ELF string tbl section */
+ long strtab_filesz; /* Size of ELF string tbl section */
+} elf_obj_tdata;
+
+#define elf_tdata(bfd) ((elf_obj_tdata *) ((bfd) -> tdata))
+#define elf_symtab_filepos(bfd) (elf_tdata(bfd) -> symtab_filepos)
+#define elf_symtab_filesz(bfd) (elf_tdata(bfd) -> symtab_filesz)
+#define elf_strtab_filepos(bfd) (elf_tdata(bfd) -> strtab_filepos)
+#define elf_strtab_filesz(bfd) (elf_tdata(bfd) -> strtab_filesz)
+
+/* Translate an ELF symbol in external format into an ELF symbol in internal
+ format. */
+
+static void
+DEFUN(elf_swap_symbol_in,(abfd, src, dst),
+ bfd *abfd AND
+ Elf_External_Sym *src AND
+ Elf_Internal_Sym *dst)
+{
+ dst -> st_name = bfd_h_get_32 (abfd, (bfd_byte *) src -> st_name);
+ dst -> st_value = bfd_h_get_32 (abfd, (bfd_byte *) src -> st_value);
+ dst -> st_size = bfd_h_get_32 (abfd, (bfd_byte *) src -> st_size);
+ dst -> st_info = bfd_h_get_8 (abfd, (bfd_byte *) src -> st_info);
+ dst -> st_other = bfd_h_get_8 (abfd, (bfd_byte *) src -> st_other);
+ dst -> st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src -> st_shndx);
+}
+
+
/* Translate an ELF header in external format into an ELF header in internal
format. */
static void
-DEFUN(bfd_swap_ehdr_in,(abfd, src, dst),
+DEFUN(elf_swap_ehdr_in,(abfd, src, dst),
bfd *abfd AND
Elf_External_Ehdr *src AND
Elf_Internal_Ehdr *dst)
ELF section header table entry in internal format. */
static void
-DEFUN(bfd_swap_shdr_in,(abfd, src, dst),
+DEFUN(elf_swap_shdr_in,(abfd, src, dst),
bfd *abfd AND
Elf_External_Shdr *src AND
Elf_Internal_Shdr *dst)
ELF program header table entry in internal format. */
static void
-DEFUN(bfd_swap_phdr_in,(abfd, src, dst),
+DEFUN(elf_swap_phdr_in,(abfd, src, dst),
bfd *abfd AND
Elf_External_Phdr *src AND
Elf_Internal_Phdr *dst)
return (true);
}
+#ifdef HAVE_PROCFS
+
+static void
+DEFUN(bfd_prstatus,(abfd, descdata, descsz, filepos),
+ bfd *abfd AND
+ char *descdata AND
+ int descsz AND
+ long filepos)
+{
+ asection *newsect;
+
+ if (descsz == sizeof (prstatus_t))
+ {
+ newsect = bfd_make_section (abfd, ".reg");
+ newsect -> size = sizeof (gregset_t);
+ newsect -> filepos = filepos + (long) (((prstatus_t *)0) -> pr_reg);
+ newsect -> flags = SEC_ALLOC | SEC_HAS_CONTENTS;
+ newsect -> alignment_power = 2;
+ if ((core_prstatus (abfd) = bfd_alloc (abfd, descsz)) != NULL)
+ {
+ bcopy (descdata, core_prstatus (abfd), descsz);
+ }
+ }
+}
+
+/* Stash a copy of the prpsinfo structure away for future use. */
+
+static void
+DEFUN(bfd_prpsinfo,(abfd, descdata, descsz, filepos),
+ bfd *abfd AND
+ char *descdata AND
+ int descsz AND
+ long filepos)
+{
+ asection *newsect;
+
+ if (descsz == sizeof (prpsinfo_t))
+ {
+ if ((core_prpsinfo (abfd) = bfd_alloc (abfd, descsz)) != NULL)
+ {
+ bcopy (descdata, core_prpsinfo (abfd), descsz);
+ }
+ }
+}
+
+static void
+DEFUN(bfd_fpregset,(abfd, descdata, descsz, filepos),
+ bfd *abfd AND
+ char *descdata AND
+ int descsz AND
+ long filepos)
+{
+ asection *newsect;
+
+ if (descsz == sizeof (fpregset_t))
+ {
+ newsect = bfd_make_section (abfd, ".reg2");
+ newsect -> size = sizeof (fpregset_t);
+ newsect -> filepos = filepos;
+ newsect -> flags = SEC_ALLOC | SEC_HAS_CONTENTS;
+ newsect -> alignment_power = 2;
+ }
+}
+
+#endif /* HAVE_PROCFS */
+
+/* Return a pointer to the args (including the command name) that were
+ seen by the program that generated the core dump. Note that for
+ some reason, a spurious space is tacked onto the end of the args
+ in some (at least one anyway) implementations, so strip it off if
+ it exists. */
+
+char *
+DEFUN(elf_core_file_failing_command, (abfd),
+ bfd *abfd)
+{
+#if HAVE_PROCFS
+ if (core_prpsinfo (abfd))
+ {
+ prpsinfo_t *p = core_prpsinfo (abfd);
+ char *scan = p -> pr_psargs;
+ while (*scan++) {;}
+ scan -= 2;
+ if ((scan > p -> pr_psargs) && (*scan == ' '))
+ {
+ *scan = '\000';
+ }
+ return (p -> pr_psargs);
+ }
+#endif
+ return (NULL);
+}
+
+/* Return the number of the signal that caused the core dump. Presumably,
+ since we have a core file, we got a signal of some kind, so don't bother
+ checking the other process status fields, just return the signal number.
+ */
+
+static int
+DEFUN(elf_core_file_failing_signal, (abfd),
+ bfd *abfd)
+{
+#if HAVE_PROCFS
+ if (core_prstatus (abfd))
+ {
+ return (((prstatus_t *)(core_prstatus (abfd))) -> pr_cursig);
+ }
+#endif
+ return (-1);
+}
+
+/* Check to see if the core file could reasonably be expected to have
+ come for the current executable file. Note that by default we return
+ true unless we find something that indicates that there might be a
+ problem.
+ */
+
+static boolean
+DEFUN(elf_core_file_matches_executable_p, (core_bfd, exec_bfd),
+ bfd *core_bfd AND
+ bfd *exec_bfd)
+{
+ char *corename;
+ char *execname;
+
+ /* First, xvecs must match since both are ELF files for the same target. */
+
+ if (core_bfd->xvec != exec_bfd->xvec)
+ {
+ bfd_error = system_call_error;
+ return (false);
+ }
+
+#if HAVE_PROCFS
+
+ /* If no prpsinfo, just return true. Otherwise, grab the last component
+ of the exec'd pathname from the prpsinfo. */
+
+ if (core_prpsinfo (core_bfd))
+ {
+ corename = (((struct prpsinfo *) core_prpsinfo (core_bfd)) -> pr_fname);
+ }
+ else
+ {
+ return (true);
+ }
+
+ /* Find the last component of the executable pathname. */
+
+ if ((execname = strrchr (exec_bfd -> filename, '/')) != NULL)
+ {
+ execname++;
+ }
+ else
+ {
+ execname = (char *) exec_bfd -> filename;
+ }
+
+ /* See if they match */
+
+ return (strcmp (execname, corename) ? false : true);
+
+#else
+
+ return (true);
+
+#endif /* HAVE_PROCFS */
+}
+
+/* ELF core files contain a segment of type PT_NOTE, that holds much of
+ the information that would normally be available from the /proc interface
+ for the process, at the time the process dumped core. Currently this
+ includes copies of the prstatus, prpsinfo, and fpregset structures.
+
+ Since these structures are potentially machine dependent in size and
+ ordering, bfd provides two levels of support for them. The first level,
+ available on all machines since it does not require that the host
+ have /proc support or the relevant include files, is to create a bfd
+ section for each of the prstatus, prpsinfo, and fpregset structures,
+ without any interpretation of their contents. With just this support,
+ the bfd client will have to interpret the structures itself. Even with
+ /proc support, it might want these full structures for it's own reasons.
+
+ In the second level of support, where HAVE_PROCFS is defined, bfd will
+ pick apart the structures to gather some additional information that
+ clients may want, such as the general register set, the name of the
+ exec'ed file and its arguments, the signal (if any) that caused the
+ core dump, etc.
+
+ */
+
+static boolean
+DEFUN(elf_corefile_note, (abfd, hdr),
+ bfd *abfd AND
+ Elf_Internal_Phdr *hdr)
+{
+ Elf_External_Note *x_note_p; /* Elf note, external form */
+ Elf_Internal_Note i_note; /* Elf note, internal form */
+ char *buf = NULL; /* Entire note segment contents */
+ char *namedata; /* Name portion of the note */
+ char *descdata; /* Descriptor portion of the note */
+ char *sectname; /* Name to use for new section */
+ long filepos; /* File offset to descriptor data */
+ asection *newsect;
+
+ if (hdr -> p_filesz > 0
+ && (buf = malloc (hdr -> p_filesz)) != NULL
+ && bfd_seek (abfd, hdr -> p_offset, SEEK_SET) != -1L
+ && bfd_read ((PTR) buf, hdr -> p_filesz, 1, abfd) == hdr -> p_filesz)
+ {
+ x_note_p = (Elf_External_Note *) buf;
+ while ((char *) x_note_p < (buf + hdr -> p_filesz))
+ {
+ i_note.namesz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p -> namesz);
+ i_note.descsz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p -> descsz);
+ i_note.type = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p -> type);
+ namedata = x_note_p -> name;
+ descdata = namedata + BFD_ALIGN (i_note.namesz, 4);
+ filepos = hdr -> p_offset + (descdata - buf);
+ switch (i_note.type) {
+ case NT_PRSTATUS:
+ /* process descdata as prstatus info */
+ bfd_prstatus (abfd, descdata, i_note.descsz, filepos);
+ sectname = ".prstatus";
+ break;
+ case NT_FPREGSET:
+ /* process descdata as fpregset info */
+ bfd_fpregset (abfd, descdata, i_note.descsz, filepos);
+ sectname = ".fpregset";
+ break;
+ case NT_PRPSINFO:
+ /* process descdata as prpsinfo */
+ bfd_prpsinfo (abfd, descdata, i_note.descsz, filepos);
+ sectname = ".prpsinfo";
+ break;
+ default:
+ /* Unknown descriptor, just ignore it. */
+ sectname = NULL;
+ break;
+ }
+ if (sectname != NULL)
+ {
+ newsect = bfd_make_section (abfd, sectname);
+ newsect -> size = i_note.descsz;
+ newsect -> filepos = filepos;
+ newsect -> flags = SEC_ALLOC | SEC_HAS_CONTENTS;
+ newsect -> alignment_power = 2;
+ }
+ x_note_p = (Elf_External_Note *)
+ (descdata + BFD_ALIGN (i_note.descsz, 4));
+ }
+ }
+ if (buf != NULL)
+ {
+ free (buf);
+ }
+}
+
+
/* Begin processing a given object.
First we validate the file by reading in the ELF header and checking
goto wrong;
}
+ /* Allocate an instance of the elf_obj_tdata structure and hook it up to
+ the tdata pointer in the bfd. */
+
+ if ((abfd -> tdata = bfd_zalloc (abfd, sizeof (elf_obj_tdata))) == NULL)
+ {
+ bfd_error = no_memory;
+ return (NULL);
+ }
+
/* Now that we know the byte order, swap in the rest of the header */
- bfd_swap_ehdr_in (abfd, &x_ehdr, &i_ehdr);
+ elf_swap_ehdr_in (abfd, &x_ehdr, &i_ehdr);
/* If there is no section header table, we're hosed. */
if (i_ehdr.e_shoff == 0)
bfd_error = system_call_error;
return (NULL);
}
- bfd_swap_shdr_in (abfd, x_shdr + shindex, i_shdr + shindex);
+ elf_swap_shdr_in (abfd, x_shdr + shindex, i_shdr + shindex);
}
/* Read in the string table containing the names of the sections. We
/* Once all of the section headers have been read and converted, we
can start processing them. Note that the first section header is
- a dummy placeholder entry, so we ignore it. */
+ a dummy placeholder entry, so we ignore it.
+
+ We also watch for the symbol table section and remember the file
+ offset and section size for both the symbol table section and the
+ associated string table section. */
for (shindex = 1; shindex < i_ehdr.e_shnum; shindex++)
{
- bfd_section_from_shdr (abfd, i_shdr + shindex, shstrtab);
+ Elf_Internal_Shdr *hdr = i_shdr + shindex;
+ bfd_section_from_shdr (abfd, hdr, shstrtab);
+ if (hdr -> sh_type == SHT_SYMTAB)
+ {
+ elf_symtab_filepos(abfd) = hdr -> sh_offset;
+ elf_symtab_filesz(abfd) = hdr -> sh_size;
+ elf_strtab_filepos(abfd) = (i_shdr + hdr -> sh_link) -> sh_offset;
+ elf_strtab_filesz(abfd) = (i_shdr + hdr -> sh_link) -> sh_size;
+ }
}
return (abfd->xvec);
the file using the execution view of the file (program header table)
rather than the linking view. In fact, there is no section header
table in a core file.
+
+ The process status information (including the contents of the general
+ register set) and the floating point register set are stored in a
+ segment of type PT_NOTE. We handcraft a couple of extra bfd sections
+ that allow standard bfd access to the general registers (.reg) and the
+ floating point registers (.reg2).
+
*/
static bfd_target *
}
/* Now that we know the byte order, swap in the rest of the header */
- bfd_swap_ehdr_in (abfd, &x_ehdr, &i_ehdr);
+ elf_swap_ehdr_in (abfd, &x_ehdr, &i_ehdr);
/* If there is no program header, or the type is not a core file, then
we are hosed. */
if (i_ehdr.e_phoff == 0 || i_ehdr.e_type != ET_CORE)
goto wrong;
+ /* Allocate an instance of the elf_core_tdata structure and hook it up to
+ the tdata pointer in the bfd. */
+
+ if ((abfd -> tdata = bfd_zalloc (abfd, sizeof (elf_core_tdata))) == NULL)
+ {
+ bfd_error = no_memory;
+ return (NULL);
+ }
+
/* Allocate space for copies of the program header table in external
and internal form, seek to the program header table in the file,
read it in, and convert it to internal form. As a simple sanity
bfd_error = system_call_error;
return (NULL);
}
- bfd_swap_phdr_in (abfd, x_phdr + phindex, i_phdr + phindex);
+ elf_swap_phdr_in (abfd, x_phdr + phindex, i_phdr + phindex);
}
/* Once all of the program headers have been read and converted, we
for (phindex = 0; phindex < i_ehdr.e_phnum; phindex++)
{
bfd_section_from_phdr (abfd, i_phdr + phindex, phindex);
+ if ((i_phdr + phindex) -> p_type == PT_NOTE)
+ {
+ elf_corefile_note (abfd, i_phdr + phindex);
+ }
}
return (abfd->xvec);
return (false);
}
+/* Given an index of a section, retrieve a pointer to it. Note
+ that for our purposes, sections are indexed by {1, 2, ...} with
+ 0 being an illegal index. */
+
+static struct sec *
+DEFUN (section_from_bfd_index, (abfd, index),
+ bfd *abfd AND
+ int index)
+{
+ if (index > 0)
+ {
+ struct sec *answer = abfd -> sections;
+ while (--index > 0)
+ {
+ answer = answer -> next;
+ }
+ return (answer);
+ }
+ return (NULL);
+}
+
+static boolean
+DEFUN (elf_slurp_symbol_table, (abfd), bfd *abfd)
+{
+ int symcount; /* Number of external ELF symbols */
+ char *strtab; /* Buffer for raw ELF string table section */
+ asymbol *sym; /* Pointer to current bfd symbol */
+ asymbol *symbase; /* Buffer for generated bfd symbols */
+ asymbol **vec; /* Pointer to current bfd symbol pointer */
+ Elf_Internal_Sym i_sym;
+ Elf_External_Sym x_sym;
+
+ if (bfd_get_outsymbols (abfd) != NULL)
+ {
+ return (true);
+ }
+
+ /* Slurp in the string table. We will keep it around permanently, as
+ long as the bfd is in use, since we will end up setting up pointers
+ into it for the names of all the symbols. */
+
+ if (bfd_seek (abfd, elf_strtab_filepos (abfd), SEEK_SET) == -1)
+ {
+ bfd_error = system_call_error;
+ return (false);
+ }
+ if ((strtab = bfd_alloc (abfd, elf_strtab_filesz (abfd))) == NULL)
+ {
+ bfd_error = system_call_error;
+ return (false);
+ }
+ if (bfd_read ((PTR) strtab, elf_strtab_filesz (abfd), 1, abfd) !=
+ elf_strtab_filesz (abfd))
+ {
+ bfd_error = system_call_error;
+ return (false);
+ }
+
+ /* Read each raw ELF symbol, converting from external ELF form to
+ internal ELF form, and then using the information to create a
+ canonical bfd symbol table entry.
+
+ Note that be allocate the initial bfd canonical symbol buffer
+ based on a one-to-one mapping of the ELF symbols to canonical
+ symbols. However, it is likely that not all the ELF symbols will
+ be used, so there will be some space leftover at the end. Once
+ we know how many symbols we actual generate, we realloc the buffer
+ to the correct size and then build the pointer vector. */
+
+ if (bfd_seek (abfd, elf_symtab_filepos (abfd), SEEK_SET) == -1)
+ {
+ bfd_error = system_call_error;
+ return (false);
+ }
+
+ symcount = elf_symtab_filesz(abfd) / sizeof (Elf_External_Sym);
+ sym = symbase = (asymbol *) bfd_zalloc (abfd, symcount * sizeof (asymbol));
+
+ while (symcount-- > 0)
+ {
+ if (bfd_read ((PTR) &x_sym, sizeof (x_sym), 1, abfd) != sizeof (x_sym))
+ {
+ bfd_error = system_call_error;
+ return (false);
+ }
+ elf_swap_symbol_in (abfd, &x_sym, &i_sym);
+ if (i_sym.st_name > 0)
+ {
+ sym -> the_bfd = abfd;
+ sym -> name = strtab + i_sym.st_name;
+ sym -> value = i_sym.st_value;
+ if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERV)
+ {
+ /* Note: This code depends upon there being an ordered
+ one-for-one mapping of ELF sections to bfd sections. */
+ sym -> section = section_from_bfd_index (abfd, i_sym.st_shndx);
+ }
+ else if (i_sym.st_shndx == SHN_ABS)
+ {
+ sym -> flags |= BSF_ABSOLUTE;
+ }
+ else if (i_sym.st_shndx == SHN_COMMON)
+ {
+ sym -> flags |= BSF_FORT_COMM;
+ }
+ switch (ELF_ST_BIND (i_sym.st_info))
+ {
+ case STB_LOCAL:
+ sym -> flags |= BSF_LOCAL;
+ break;
+ case STB_GLOBAL:
+ sym -> flags |= (BSF_GLOBAL | BSF_EXPORT);
+ break;
+ case STB_WEAK:
+ sym -> flags |= BSF_WEAK;
+ break;
+ }
+ sym++;
+ }
+ }
+
+ bfd_get_symcount(abfd) = symcount = sym - symbase;
+ sym = symbase = (asymbol *)
+ bfd_realloc (abfd, symbase, symcount * sizeof (asymbol));
+ bfd_get_outsymbols(abfd) = vec = (asymbol **)
+ bfd_alloc (abfd, symcount * sizeof (asymbol *));
+
+ while (symcount-- > 0)
+ {
+ *vec++ = sym++;
+ }
+
+ return (true);
+}
+
+/* Return the number of bytes required to hold the symtab vector.
+
+ Note that we base it on the count plus 1, since we will null terminate
+ the vector allocated based on this size. */
+
static unsigned int
-elf_get_symtab_upper_bound(abfd)
-bfd *abfd;
+DEFUN (elf_get_symtab_upper_bound, (abfd), bfd *abfd)
{
- fprintf (stderr, "elf_get_symtab_upper_bound unimplemented\n");
- fflush (stderr);
- abort ();
- return (0);
+ unsigned int symtab_size = 0;
+
+ if (elf_slurp_symbol_table (abfd))
+ {
+ symtab_size = (bfd_get_symcount (abfd) + 1) * (sizeof (asymbol));
+ }
+ return (symtab_size);
}
static unsigned int
}
static unsigned int
-elf_get_symtab (abfd, alocation)
-bfd *abfd;
-asymbol **alocation;
+DEFUN (elf_get_symtab, (abfd, alocation),
+ bfd *abfd AND
+ asymbol **alocation)
{
- fprintf (stderr, "elf_get_symtab unimplemented\n");
- fflush (stderr);
- abort ();
- return (0);
+ unsigned int symcount;
+ asymbol **vec;
+
+ if (!elf_slurp_symbol_table (abfd))
+ {
+ return (0);
+ }
+ else
+ {
+ symcount = bfd_get_symcount (abfd);
+ vec = bfd_get_outsymbols (abfd);
+ while (symcount-- > 0)
+ {
+ *alocation++ = *vec++;
+ }
+ *alocation++ = NULL;
+ return (bfd_get_symcount (abfd));
+ }
}
static asymbol *
There are two such structures here: one for big-endian machines and
one for little-endian machines. */
-#define elf_core_file_failing_command _bfd_dummy_core_file_failing_command
-#define elf_core_file_failing_signal _bfd_dummy_core_file_failing_signal
-#define elf_core_file_matches_executable_p _bfd_dummy_core_file_matches_executable_p
-
/* Archives are generic or unimplemented. */
#define elf_slurp_armap bfd_false
#define elf_slurp_extended_name_table _bfd_slurp_extended_name_table
projects / binutils-gdb.git / commitdiff