From: Stas Sergeev <stsp2@yandex.ru>
To: libc-alpha@sourceware.org
Cc: Stas Sergeev <stsp2@yandex.ru>
Subject: [PATCH 08/13] elf: convert _dl_map_segments's mmap() to a callback
Date: Sat, 18 Mar 2023 21:51:05 +0500 [thread overview]
Message-ID: <20230318165110.3672749-9-stsp2@yandex.ru> (raw)
In-Reply-To: <20230318165110.3672749-1-stsp2@yandex.ru>
This only applies to file-based mmap.
Since _dl_map_segment() was converted to
anonymous mmap, only 1 place is now converted
to a callback.
The test-suite was run on x86_64/64 and showed no regressions.
Signed-off-by: Stas Sergeev <stsp2@yandex.ru>
---
elf/dl-load.c | 19 ++++++++++++++-----
elf/dl-load.h | 8 ++++++--
elf/dl-map-segments.h | 6 +++---
3 files changed, 23 insertions(+), 10 deletions(-)
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 67e4933735..17f16c7dd0 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -954,11 +954,12 @@ _dl_process_pt_gnu_property (struct link_map *l, int fd, const ElfW(Phdr) *ph)
}
static int
-_ld_map_object_1 (struct link_map *l, int fd,
+_ld_map_object_1 (struct link_map *l, void *fd,
struct filebuf *fbp,
int mode, struct link_map *loader,
void **stack_endp, int *errval_p,
- const char **errstring_p)
+ const char **errstring_p,
+ __typeof (do_mmap) *m_map)
{
const ElfW(Ehdr) *header;
const ElfW(Phdr) *phdr;
@@ -1158,7 +1159,7 @@ _ld_map_object_1 (struct link_map *l, int fd,
l_map_start, l_map_end, l_addr, l_contiguous, l_text_end, l_phdr
*/
errstring = _dl_map_segments (l, fd, header, type, loadcmds, nloadcmds,
- maplength, has_holes, loader);
+ maplength, has_holes, loader, m_map);
if (__glibc_unlikely (errstring != NULL))
{
/* Mappings can be in an inconsistent state: avoid unmap. */
@@ -1425,6 +1426,14 @@ _ld_map_object_2 (struct link_map *l, int mode,
/* Map in the shared object NAME, actually located in REALNAME, and already
opened on FD. */
+static void *
+do_mmap (void *addr, size_t length, int prot, int flags,
+ void *arg, off_t offset)
+{
+ int fd = *(const int *) arg;
+ return __mmap (addr, length, prot, flags, fd, offset);
+}
+
#ifndef EXTERNAL_MAP_FROM_FD
static
#endif
@@ -1554,8 +1563,8 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
goto lose_errno;
}
- if (_ld_map_object_1 (l, fd, fbp, mode, loader, stack_endp, &errval,
- &errstring))
+ if (_ld_map_object_1 (l, &fd, fbp, mode, loader, stack_endp, &errval,
+ &errstring, do_mmap))
goto lose;
/* We are done mapping in the file. We no longer need the descriptor. */
diff --git a/elf/dl-load.h b/elf/dl-load.h
index ecf6910c68..eff5146acd 100644
--- a/elf/dl-load.h
+++ b/elf/dl-load.h
@@ -80,6 +80,9 @@ struct loadcmd
int prot; /* PROT_* bits. */
};
+static void *
+do_mmap (void *addr, size_t length, int prot, int flags,
+ void *arg, off_t offset);
/* This is a subroutine of _dl_map_segments. It should be called for each
load command, some time after L->l_addr has been set correctly. It is
@@ -113,13 +116,14 @@ _dl_postprocess_loadcmd (struct link_map *l, const ElfW(Ehdr) *header,
The file <dl-map-segments.h> defines this function. The canonical
implementation in elf/dl-map-segments.h might be replaced by a sysdeps
version. */
-static const char *_dl_map_segments (struct link_map *l, int fd,
+static const char *_dl_map_segments (struct link_map *l, void *fd,
const ElfW(Ehdr) *header, int type,
const struct loadcmd loadcmds[],
size_t nloadcmds,
const size_t maplength,
bool has_holes,
- struct link_map *loader);
+ struct link_map *loader,
+ __typeof (do_mmap) *m_map);
/* All the error message strings _dl_map_segments might return are
listed here so that different implementations in different sysdeps
diff --git a/elf/dl-map-segments.h b/elf/dl-map-segments.h
index 9af8cae188..a5c041c740 100644
--- a/elf/dl-map-segments.h
+++ b/elf/dl-map-segments.h
@@ -78,11 +78,11 @@ _dl_map_segment (ElfW(Addr) mappref, size_t maplength, size_t mapalign)
other use of those parts of the address space). */
static __always_inline const char *
-_dl_map_segments (struct link_map *l, int fd,
+_dl_map_segments (struct link_map *l, void *fd,
const ElfW(Ehdr) *header, int type,
const struct loadcmd loadcmds[], size_t nloadcmds,
const size_t maplength, bool has_holes,
- struct link_map *loader)
+ struct link_map *loader, __typeof (do_mmap) *m_map)
{
const struct loadcmd *c = loadcmds;
@@ -142,7 +142,7 @@ _dl_map_segments (struct link_map *l, int fd,
{
if (c->mapend > c->mapstart
/* Map the segment contents from the file. */
- && (__mmap ((void *) (l->l_addr + c->mapstart),
+ && (m_map ((void *) (l->l_addr + c->mapstart),
c->mapend - c->mapstart, c->prot,
MAP_FIXED|MAP_COPY|MAP_FILE,
fd, c->mapoff)
--
2.37.2
next prev parent reply other threads:[~2023-03-18 16:51 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-18 16:50 [PATCH v9 0/13] implement dlmem() function Stas Sergeev
2023-03-18 16:50 ` [PATCH 01/13] elf: strdup() l_name if no realname [BZ #30100] Stas Sergeev
2023-03-29 13:54 ` Adhemerval Zanella Netto
2023-03-29 14:12 ` stsp
2023-03-29 14:19 ` Adhemerval Zanella Netto
2023-03-29 14:28 ` stsp
2023-03-29 14:30 ` Adhemerval Zanella Netto
2023-03-29 14:33 ` stsp
2023-03-18 16:50 ` [PATCH 02/13] elf: switch _dl_map_segment() to anonymous mapping Stas Sergeev
2023-03-29 17:01 ` Adhemerval Zanella Netto
2023-03-29 18:00 ` stsp
2023-03-29 18:29 ` Adhemerval Zanella Netto
2023-03-29 18:46 ` stsp
2023-03-29 19:17 ` Adhemerval Zanella Netto
2023-03-29 19:43 ` stsp
2023-03-18 16:51 ` [PATCH 03/13] elf: dont pass fd to _dl_process_pt_xx Stas Sergeev
2023-03-29 17:10 ` Adhemerval Zanella Netto
2023-03-30 16:08 ` stsp
2023-03-30 20:46 ` Adhemerval Zanella Netto
2023-03-31 12:02 ` Szabolcs Nagy
2023-03-31 12:54 ` Adhemerval Zanella Netto
2023-03-31 14:04 ` stsp
2023-03-18 16:51 ` [PATCH 04/13] elf: split _dl_map_object_from_fd() into reusable parts Stas Sergeev
2023-03-18 16:51 ` [PATCH 05/13] elf: split open_verify() " Stas Sergeev
2023-03-18 16:51 ` [PATCH 06/13] elf: load elf hdr fully in open_verify() Stas Sergeev
2023-03-18 16:51 ` [PATCH 07/13] elf: convert pread64 to callback in do_open_verify() Stas Sergeev
2023-03-18 16:51 ` Stas Sergeev [this message]
2023-03-18 16:51 ` [PATCH 09/13] elf: call _dl_map_segment() via premap callback Stas Sergeev
2023-03-18 16:51 ` [PATCH 10/13] elf: convert _dl_map_object to a callback Stas Sergeev
2023-03-18 16:51 ` [PATCH 11/13] elf: split _dl_check_loaded() from _dl_map_object Stas Sergeev
2023-03-18 16:51 ` [PATCH 12/13] dlfcn,elf: implement dlmem() [BZ #11767] Stas Sergeev
2023-03-29 13:45 ` Carlos O'Donell
2023-03-29 13:51 ` stsp
2023-03-29 14:10 ` Jonathon Anderson
2023-03-29 14:20 ` stsp
2023-03-29 14:31 ` Adhemerval Zanella Netto
2023-03-29 15:01 ` stsp
2023-03-29 14:35 ` Carlos O'Donell
2023-03-29 14:50 ` stsp
2023-03-29 15:20 ` Carlos O'Donell
2023-03-29 15:34 ` stsp
2023-03-30 8:09 ` stsp
2023-03-18 16:51 ` [PATCH 13/13] dlfcn,elf: impl DLMEM_DONTREPLACE dlmem() flag Stas Sergeev
2023-03-29 12:32 ` [PATCH v9 0/13] implement dlmem() function Adhemerval Zanella Netto
2023-03-29 13:10 ` stsp
2023-03-29 13:18 ` stsp
2023-03-31 12:20 ` Szabolcs Nagy
2023-03-31 13:51 ` stsp
2023-03-31 14:49 ` Rich Felker
2023-03-31 14:56 ` stsp
2023-03-31 14:58 ` Rich Felker
2023-03-31 15:03 ` stsp
2023-03-31 14:44 ` stsp
2023-03-31 15:12 ` stsp
2023-03-31 17:12 ` Szabolcs Nagy
2023-03-31 17:36 ` stsp
2023-04-01 9:28 ` stsp
2023-04-03 10:04 ` Szabolcs Nagy
2023-04-03 10:43 ` stsp
2023-04-03 12:01 ` Szabolcs Nagy
2023-04-03 13:07 ` stsp
2023-04-05 7:29 ` stsp
2023-04-05 8:51 ` Szabolcs Nagy
2023-04-05 9:26 ` stsp
2023-04-05 9:31 ` Florian Weimer
2023-04-12 17:23 ` stsp
2023-04-12 18:00 ` stsp
2023-04-12 18:20 ` Rich Felker
2023-04-12 18:46 ` stsp
2023-04-12 19:52 ` Zack Weinberg
2023-04-12 19:07 ` stsp
2023-04-13 10:01 ` stsp
2023-04-13 12:38 ` Szabolcs Nagy
2023-04-13 15:59 ` stsp
2023-04-13 18:09 ` Adhemerval Zanella Netto
2023-04-13 18:59 ` stsp
2023-04-13 19:12 ` Adhemerval Zanella Netto
2023-04-13 19:29 ` stsp
2023-04-13 20:02 ` Adhemerval Zanella Netto
2023-04-13 20:21 ` stsp
2023-04-13 20:57 ` stsp
2023-04-14 7:07 ` stsp
2023-04-14 7:36 ` stsp
2023-04-14 11:30 ` stsp
2023-04-14 19:04 ` proof for dlmem() (Re: [PATCH v9 0/13] implement dlmem() function) stsp
2023-05-01 23:11 ` Zack Weinberg
2023-05-02 5:48 ` stsp
2023-05-08 16:00 ` stsp
2023-05-02 6:24 ` stsp
2023-05-08 15:10 ` [PATCH v9 0/13] implement dlmem() function stsp
2023-03-31 18:47 ` stsp
2023-03-31 19:00 ` stsp
2023-03-29 13:17 ` Carlos O'Donell
2023-03-29 13:26 ` stsp
2023-03-29 17:03 ` stsp
2023-03-29 18:13 ` Carlos O'Donell
2023-03-29 18:29 ` stsp
2023-03-31 11:04 ` stsp
2023-04-13 21:17 ` Carlos O'Donell
2023-04-13 21:58 ` stsp
2023-04-13 22:08 ` stsp
2023-04-13 22:50 ` stsp
2023-04-14 16:15 ` Autoconf maintenance (extremely tangential to Re: [PATCH v9 0/13] implement dlmem() function) Zack Weinberg
2023-04-14 20:24 ` Carlos O'Donell
2023-04-14 20:40 ` Zack Weinberg
2023-05-08 15:05 ` [PATCH v9 0/13] implement dlmem() function stsp
2023-05-19 7:26 ` stsp
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230318165110.3672749-9-stsp2@yandex.ru \
--to=stsp2@yandex.ru \
--cc=libc-alpha@sourceware.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).