diff options
Diffstat (limited to 'sysdeps/generic/dl-sysdep.c')
| -rw-r--r-- | sysdeps/generic/dl-sysdep.c | 92 |
1 files changed, 77 insertions, 15 deletions
diff --git a/sysdeps/generic/dl-sysdep.c b/sysdeps/generic/dl-sysdep.c index 34498a880c..1fae16efce 100644 --- a/sysdeps/generic/dl-sysdep.c +++ b/sysdeps/generic/dl-sysdep.c @@ -1,5 +1,5 @@ /* Operating system support for run-time dynamic linker. Generic Unix version. - Copyright (C) 1995-1998, 2000-2003, 2004 Free Software Foundation, Inc. + Copyright (C) 1995-1998, 2000-2003, 2004, 2005 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -39,6 +39,12 @@ #include <hp-timing.h> #include <tls.h> +#ifdef _DL_FIRST_PLATFORM +# define _DL_FIRST_EXTRA (_DL_FIRST_PLATFORM + _DL_PLATFORMS_COUNT) +#else +# define _DL_FIRST_EXTRA _DL_HWCAP_COUNT +#endif + extern char **_environ attribute_hidden; extern void _end attribute_hidden; @@ -149,7 +155,7 @@ _dl_sysdep_start (void **start_argptr, GLRO(dl_platform) = av->a_un.a_ptr; break; case AT_HWCAP: - GLRO(dl_hwcap) = av->a_un.a_val; + GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val; break; case AT_CLKTCK: GLRO(dl_clktck) = av->a_un.a_val; @@ -172,10 +178,6 @@ _dl_sysdep_start (void **start_argptr, #endif } -#ifdef DL_SYSDEP_OSCHECK - DL_SYSDEP_OSCHECK (dl_fatal); -#endif - #ifndef HAVE_AUX_SECURE if (seen != -1) { @@ -343,7 +345,7 @@ _dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz, size_t *max_capstrlen) { /* Determine how many important bits are set. */ - unsigned long int masked = GLRO(dl_hwcap) & GLRO(dl_hwcap_mask); + uint64_t masked = GLRO(dl_hwcap) & GLRO(dl_hwcap_mask); size_t cnt = platform != NULL; size_t n, m; size_t total; @@ -353,18 +355,64 @@ _dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz, char *cp; /* Count the number of bits set in the masked value. */ - for (n = 0; (~((1UL << n) - 1) & masked) != 0; ++n) - if ((masked & (1UL << n)) != 0) + for (n = 0; (~((1ULL << n) - 1) & masked) != 0; ++n) + if ((masked & (1ULL << n)) != 0) ++cnt; +#if (defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO) && defined SHARED + /* The system-supplied DSO can contain a note of type 2, vendor "GNU". + This gives us a list of names to treat as fake hwcap bits. */ + + const char *dsocaps = NULL; + size_t dsocapslen = 0; + if (GLRO(dl_sysinfo_map) != NULL) + { + const ElfW(Phdr) *const phdr = GLRO(dl_sysinfo_map)->l_phdr; + const ElfW(Word) phnum = GLRO(dl_sysinfo_map)->l_phnum; + for (uint_fast16_t i = 0; i < phnum; ++i) + if (phdr[i].p_type == PT_NOTE) + { + const ElfW(Addr) start = (phdr[i].p_vaddr + + GLRO(dl_sysinfo_map)->l_addr); + const struct + { + ElfW(Word) vendorlen; + ElfW(Word) datalen; + ElfW(Word) type; + } *note = (const void *) start; + while ((ElfW(Addr)) (note + 1) - start < phdr[i].p_memsz) + { +#define ROUND(len) (((len) + sizeof (ElfW(Word)) - 1) & -sizeof (ElfW(Word))) + if (note->type == 2 + && note->vendorlen == sizeof "GNU" + && !memcmp ((note + 1), "GNU", sizeof "GNU") + && note->datalen > 2 * sizeof (ElfW(Word)) + 2) + { + const ElfW(Word) *p = ((const void *) (note + 1) + + ROUND (sizeof "GNU")); + cnt += *p++; + ++p; /* Skip mask word. */ + dsocaps = (const char *) p; + dsocapslen = note->datalen - sizeof *p; + break; + } + note = ((const void *) (note + 1) + + ROUND (note->vendorlen) + ROUND (note->datalen)); + } + if (dsocaps != NULL) + break; + } + } +#endif + #ifdef USE_TLS /* For TLS enabled builds always add 'tls'. */ ++cnt; #else if (cnt == 0) { - /* If we have platform name and no important capability we only have - the base directory to search. */ + /* If we no have platform name and no important capability we only + have the base directory to search. */ result = (struct r_strlenpair *) malloc (sizeof (*result)); if (result == NULL) goto no_memory; @@ -380,12 +428,26 @@ _dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz, /* Create temporary data structure to generate result table. */ temp = (struct r_strlenpair *) alloca (cnt * sizeof (*temp)); m = 0; +#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO + if (dsocaps != NULL) + { + GLRO(dl_hwcap) |= ((uint64_t) ((const ElfW(Word) *) dsocaps)[-1] + << _DL_FIRST_EXTRA); + for (const char *p = dsocaps; + p < dsocaps + dsocapslen; + p += temp[m++].len + 1) + { + temp[m].str = p; + temp[m].len = strlen (p); + } + } +#endif for (n = 0; masked != 0; ++n) - if ((masked & (1UL << n)) != 0) + if ((masked & (1ULL << n)) != 0) { temp[m].str = _dl_hwcap_string (n); temp[m].len = strlen (temp[m].str); - masked ^= 1UL << n; + masked ^= 1ULL << n; ++m; } if (platform != NULL) @@ -503,8 +565,8 @@ _dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz, ++rp; } - /* The second have starts right after the first part of the string of - corresponding entry in the first half. */ + /* The second half starts right after the first part of the string of + the corresponding entry in the first half. */ do { rp[0].str = rp[-(1 << (cnt - 1))].str + temp[cnt - 1].len + 1; |