diff options
Diffstat (limited to 'ld/plugin.c')
| -rw-r--r-- | ld/plugin.c | 53 |
1 files changed, 41 insertions, 12 deletions
diff --git a/ld/plugin.c b/ld/plugin.c index a799ec7..89083db 100644 --- a/ld/plugin.c +++ b/ld/plugin.c @@ -104,6 +104,7 @@ typedef struct plugin_input_file view_buffer_t view_buffer; char *name; int fd; + bfd_boolean use_mmap; off_t offset; off_t filesize; } plugin_input_file_t; @@ -137,6 +138,11 @@ static struct bfd_link_callbacks plugin_callbacks; its own newly-added input files and libs to claim. */ bfd_boolean no_more_claiming = FALSE; +#if HAVE_MMAP && HAVE_GETPAGESIZE +/* Page size used by mmap. */ +static off_t plugin_pagesize; +#endif + /* List of tags to set in the constant leading part of the tv array. */ static const enum ld_plugin_tag tv_header_tags[] = { @@ -499,8 +505,9 @@ get_view (const void *handle, const void **viewp) plugin_input_file_t *input = (plugin_input_file_t *) handle; char *buffer; size_t size = input->filesize; -#if HAVE_GETPAGESIZE - off_t offset, bias; + off_t offset = input->offset; +#if HAVE_MMAP && HAVE_GETPAGESIZE + off_t bias; #endif ASSERT (called_plugin); @@ -513,34 +520,37 @@ get_view (const void *handle, const void **viewp) /* Check the cached view buffer. */ if (input->view_buffer.addr != NULL && input->view_buffer.filesize == size - && input->view_buffer.offset == input->offset) + && input->view_buffer.offset == offset) { *viewp = input->view_buffer.addr; return LDPS_OK; } input->view_buffer.filesize = size; - input->view_buffer.offset = input->offset; + input->view_buffer.offset = offset; #if HAVE_MMAP # if HAVE_GETPAGESIZE - bias = input->offset % getpagesize ();; - offset = input->offset - bias; + bias = offset % plugin_pagesize; + offset -= bias; size += bias; # endif buffer = mmap (NULL, size, PROT_READ, MAP_PRIVATE, input->fd, offset); -# if HAVE_GETPAGESIZE if (buffer != MAP_FAILED) - buffer += bias; - else -# else - if (buffer == MAP_FAILED) + { + input->use_mmap = TRUE; +# if HAVE_GETPAGESIZE + buffer += bias; # endif + } + else #endif { char *p; - if (lseek (input->fd, input->offset, SEEK_SET) < 0) + input->use_mmap = FALSE; + + if (lseek (input->fd, offset, SEEK_SET) < 0) return LDPS_ERR; buffer = bfd_alloc (input->abfd, size); @@ -968,6 +978,10 @@ plugin_load_plugins (void) link_info.notice_all = TRUE; link_info.lto_plugin_active = TRUE; link_info.callbacks = &plugin_callbacks; + +#if HAVE_MMAP && HAVE_GETPAGESIZE + plugin_pagesize = getpagesize ();; +#endif } /* Call 'claim file' hook for all plugins. */ @@ -1102,6 +1116,21 @@ plugin_maybe_claim (lang_input_statement_type *entry) } else { +#if HAVE_MMAP + if (input->use_mmap) + { + /* If plugin didn't claim the file, unmap the buffer. */ + char *addr = input->view_buffer.addr; + off_t size = input->view_buffer.filesize; +# if HAVE_GETPAGESIZE + off_t bias = input->view_buffer.offset % plugin_pagesize; + size += bias; + addr -= bias; +# endif + munmap (addr, size); + } +#endif + /* If plugin didn't claim the file, we don't need the dummy bfd. Can't avoid speculatively creating it, alas. */ bfd_close_all_done (abfd); |