diff options
Diffstat (limited to 'libctf/ctf-open.c')
| -rw-r--r-- | libctf/ctf-open.c | 56 |
1 files changed, 31 insertions, 25 deletions
diff --git a/libctf/ctf-open.c b/libctf/ctf-open.c index ecf27ee..7816fd0 100644 --- a/libctf/ctf-open.c +++ b/libctf/ctf-open.c @@ -22,7 +22,6 @@ #include <string.h> #include <sys/types.h> #include <elf.h> -#include <assert.h> #include "swap.h" #include <bfd.h> #include <zlib.h> @@ -227,7 +226,10 @@ static const ctf_dictops_t ctf_dictops[] = { symtypetabs come from the compiler, and all the linker does is iteration over all entries, which doesn't need this initialization.) - The SP symbol table section may be NULL if there is no symtab. */ + The SP symbol table section may be NULL if there is no symtab. + + If init_symtab works on one call, it cannot fail on future calls to the same + fp: ctf_symsect_endianness relies on this. */ static int init_symtab (ctf_dict_t *fp, const ctf_header_t *hp, const ctf_sect_t *sp) @@ -290,6 +292,10 @@ init_symtab (ctf_dict_t *fp, const ctf_header_t *hp, const ctf_sect_t *sp) return ECTF_SYMTAB; } + /* This call may be led astray if our idea of the symtab's endianness is + wrong, but when this is fixed by a call to ctf_symsect_endianness, + init_symtab will be called again with the right endianness in + force. */ if (ctf_symtab_skippable (&sym)) { *xp = -1u; @@ -974,28 +980,6 @@ init_types (ctf_dict_t *fp, ctf_header_t *cth) We flip everything, mindlessly, even 1-byte entities, so that future expansions do not require changes to this code. */ -/* < C11? define away static assertions. */ - -#if !defined (__STDC_VERSION__) || __STDC_VERSION__ < 201112L -#define _Static_assert(cond, err) -#endif - -/* Swap the endianness of something. */ - -#define swap_thing(x) \ - do { \ - _Static_assert (sizeof (x) == 1 || (sizeof (x) % 2 == 0 \ - && sizeof (x) <= 8), \ - "Invalid size, update endianness code"); \ - switch (sizeof (x)) { \ - case 2: x = bswap_16 (x); break; \ - case 4: x = bswap_32 (x); break; \ - case 8: x = bswap_64 (x); break; \ - case 1: /* Nothing needs doing */ \ - break; \ - } \ - } while (0); - /* Flip the endianness of the CTF header. */ static void @@ -1652,7 +1636,13 @@ ctf_bufopen_internal (const ctf_sect_t *ctfsect, const ctf_sect_t *symsect, large for the actual size of the object and function info sections: if so, ctf_nsyms will be adjusted and the excess will never be used. It's possible to do indexed symbol lookups even without a symbol table, so check - even in that case. */ + even in that case. Initially, we assume the symtab is native-endian: if it + isn't, the caller will inform us later by calling ctf_symsect_endianness. */ +#ifdef WORDS_BIGENDIAN + fp->ctf_symsect_little_endian = 0; +#else + fp->ctf_symsect_little_endian = 1; +#endif if (symsect != NULL) { @@ -1866,6 +1856,22 @@ ctf_getstrsect (const ctf_dict_t *fp) return fp->ctf_strtab; } +/* Set the endianness of the symbol table attached to FP. */ +void +ctf_symsect_endianness (ctf_dict_t *fp, int little_endian) +{ + int old_endianness = fp->ctf_symsect_little_endian; + + fp->ctf_symsect_little_endian = !!little_endian; + + /* If we already have a symtab translation table, we need to repopulate it if + our idea of the endianness has changed. */ + + if (old_endianness != fp->ctf_symsect_little_endian + && fp->ctf_sxlate != NULL && fp->ctf_symtab.cts_data != NULL) + assert (init_symtab (fp, fp->ctf_header, &fp->ctf_symtab) == 0); +} + /* Return the CTF handle for the parent CTF dict, if one exists. Otherwise return NULL to indicate this dict has no imported parent. */ ctf_dict_t * |