From: Zhangjin Wu <falcon@tinylab.org>
To: thomas@t-8ch.de
Cc: arnd@arndb.de, david.laight@aculab.com, falcon@tinylab.org,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-riscv@lists.infradead.org, w@1wt.eu
Subject: Re: [PATCH v4 07/10] tools/nolibc: clean up mmap() support
Date: Fri, 23 Jun 2023 03:08:43 +0800 [thread overview]
Message-ID: <20230622190843.1189684-1-falcon@tinylab.org> (raw)
In-Reply-To: <31d85464-5731-4df6-8fcd-2b0be11eac90@t-8ch.de>
Hi, Thomas
> On 2023-06-19 23:51:20+0800, Zhangjin Wu wrote:
> > Do several cleanups together:
> >
> > - Since all supported architectures have my_syscall6() now, remove the
> > #ifdef check.
> >
> > - Move the mmap() related macros to tools/include/nolibc/types.h
> >
> > - Apply the new __sysret() to convert the calling of sys_map() to
> > oneline code
> >
> > Signed-off-by: Zhangjin Wu <falcon@tinylab.org>
> > ---
> > tools/include/nolibc/sys.h | 24 +-----------------------
> > tools/include/nolibc/types.h | 11 +++++++++++
> > 2 files changed, 12 insertions(+), 23 deletions(-)
> >
> > diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
> > index 8a6e16472d54..1c02cec3bcd9 100644
> > --- a/tools/include/nolibc/sys.h
> > +++ b/tools/include/nolibc/sys.h
> > @@ -624,26 +624,11 @@ int mknod(const char *path, mode_t mode, dev_t dev)
> > return __sysret(sys_mknod(path, mode, dev));
> > }
> >
> > -#ifndef MAP_SHARED
> > -#define MAP_SHARED 0x01 /* Share changes */
> > -#define MAP_PRIVATE 0x02 /* Changes are private */
> > -#define MAP_SHARED_VALIDATE 0x03 /* share + validate extension flags */
> > -#endif
> > -
> > -#ifndef MAP_FAILED
> > -#define MAP_FAILED ((void *)-1)
> > -#endif
> > -
> > #ifndef sys_mmap
> > static __attribute__((unused))
> > void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
> > off_t offset)
>
> This could return a plain integer type instead to save some casts.
> Not sure if API compatibility is guaranteed for the raw sys_ functions.
>
Seems musl simply not provide the sys_xxx() functions, but let the library
routines call __syscall() directly. If we can treat these sys_xxx() as internal
functions, perhaps we can simply let the return type of sys_xxx() as 'long' to.
$ grep "^void \*sys_" -ur tools/include/nolibc/sys.h
void *sys_brk(void *addr)
void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
Thanks,
Zhangjin
> > {
> > -#ifndef my_syscall6
> > - /* Function not implemented. */
> > - return (void *)-ENOSYS;
> > -#else
> > -
> > int n;
> >
> > #if defined(__NR_mmap2)
> > @@ -654,20 +639,13 @@ void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
> > #endif
> >
> > return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset);
> > -#endif
> > }
> > #endif
> >
> > static __attribute__((unused))
> > void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
> > {
> > - void *ret = sys_mmap(addr, length, prot, flags, fd, offset);
> > -
> > - if ((unsigned long)ret >= -4095UL) {
> > - SET_ERRNO(-(long)ret);
> > - ret = MAP_FAILED;
> > - }
> > - return ret;
> > + return (void *)__sysret((unsigned long)sys_mmap(addr, length, prot, flags, fd, offset));
> > }
> >
> > static __attribute__((unused))
> > diff --git a/tools/include/nolibc/types.h b/tools/include/nolibc/types.h
> > index f96e28bff4ba..f889d4e0ac7e 100644
> > --- a/tools/include/nolibc/types.h
> > +++ b/tools/include/nolibc/types.h
> > @@ -81,6 +81,17 @@
> > #define MAXPATHLEN (PATH_MAX)
> > #endif
> >
> > +/* flags for mmap */
> > +#ifndef MAP_SHARED
> > +#define MAP_SHARED 0x01 /* Share changes */
> > +#define MAP_PRIVATE 0x02 /* Changes are private */
> > +#define MAP_SHARED_VALIDATE 0x03 /* share + validate extension flags */
> > +#endif
> > +
> > +#ifndef MAP_FAILED
> > +#define MAP_FAILED ((void *)-1)
> > +#endif
> > +
> > /* whence values for lseek() */
> > #define SEEK_SET 0
> > #define SEEK_CUR 1
> > --
> > 2.25.1
> >
next prev parent reply other threads:[~2023-06-22 19:09 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-19 15:40 [PATCH v4 00/10] tools/nolibc: add a new syscall helper Zhangjin Wu
2023-06-19 15:41 ` [PATCH v4 01/10] tools/nolibc: sys.h: add a syscall return helper Zhangjin Wu
2023-06-19 15:42 ` [PATCH v4 02/10] tools/nolibc: unistd.h: apply __sysret() helper Zhangjin Wu
2023-06-19 15:44 ` [PATCH v4 03/10] tools/nolibc: sys.h: " Zhangjin Wu
2023-06-19 15:45 ` [PATCH v4 04/10] tools/nolibc: unistd.h: reorder the syscall macros Zhangjin Wu
2023-06-19 15:47 ` [PATCH v4 05/10] tools/nolibc: add missing my_syscall6() for mips Zhangjin Wu
2023-06-19 15:48 ` [PATCH v4 06/10] tools/nolibc: __sysret: support syscalls who return a pointer Zhangjin Wu
2023-06-19 15:51 ` [PATCH v4 07/10] tools/nolibc: clean up mmap() support Zhangjin Wu
2023-06-21 18:48 ` Thomas Weißschuh
2023-06-22 19:08 ` Zhangjin Wu [this message]
2023-06-19 15:52 ` [PATCH v4 08/10] selftests/nolibc: add EXPECT_PTREQ, EXPECT_PTRNE and EXPECT_PTRER Zhangjin Wu
2023-06-19 15:54 ` [PATCH v4 09/10] selftests/nolibc: add sbrk_0 to test current brk getting Zhangjin Wu
2023-06-19 15:55 ` [PATCH v4 10/10] selftests/nolibc: add mmap and munmap test cases Zhangjin Wu
2023-06-19 16:14 ` Zhangjin Wu
2023-06-21 18:58 ` Thomas Weißschuh
2023-06-22 19:32 ` Zhangjin Wu
2023-06-22 19:56 ` Thomas Weißschuh
2023-06-24 7:47 ` Zhangjin Wu
2023-06-28 13:07 ` [PATCH v5 00/14] tools/nolibc: add a new syscall helper Zhangjin Wu
2023-06-28 13:08 ` [PATCH v5 01/14] tools/nolibc: sys.h: add a syscall return helper Zhangjin Wu
2023-06-28 13:11 ` [PATCH v5 02/14] tools/nolibc: unistd.h: apply __sysret() helper Zhangjin Wu
2023-06-28 13:13 ` [PATCH v5 03/14] tools/nolibc: sys.h: " Zhangjin Wu
2023-06-28 13:14 ` [PATCH v5 04/14] tools/nolibc: unistd.h: reorder the syscall macros Zhangjin Wu
2023-06-28 13:17 ` [PATCH v5 05/14] tools/nolibc: string.h: clean up multiple whitespaces with tab Zhangjin Wu
2023-06-28 13:19 ` [PATCH v5 06/14] tools/nolibc: arch-*.h: clean up multiple whitespaces Zhangjin Wu
2023-07-02 18:44 ` Willy Tarreau
2023-07-03 14:02 ` Zhangjin Wu
2023-06-28 13:22 ` [PATCH v5 07/14] tools/nolibc: arch-loongarch.h: shrink with SYSCALL_CLOBBERLIST Zhangjin Wu
2023-07-02 18:50 ` Willy Tarreau
2023-07-03 11:28 ` Zhangjin Wu
2023-06-28 13:31 ` [PATCH v5 08/14] tools/nolibc: arch-mips.h: " Zhangjin Wu
2023-06-28 13:37 ` [PATCH v5 09/14] tools/nolibc: add missing my_syscall6() for mips Zhangjin Wu
2023-07-02 18:55 ` Willy Tarreau
2023-07-03 10:13 ` Zhangjin Wu
2023-06-28 13:39 ` [PATCH v5 10/14] tools/nolibc: __sysret: support syscalls who return a pointer Zhangjin Wu
2023-07-02 19:17 ` Willy Tarreau
2023-07-03 8:36 ` Zhangjin Wu
2023-07-03 10:03 ` Willy Tarreau
2023-07-03 11:15 ` Zhangjin Wu
2023-06-28 13:41 ` [PATCH v5 11/14] tools/nolibc: clean up mmap() support Zhangjin Wu
2023-07-02 19:23 ` Willy Tarreau
2023-07-03 6:51 ` Zhangjin Wu
2023-06-28 13:44 ` [PATCH v5 12/14] selftests/nolibc: add EXPECT_PTREQ, EXPECT_PTRNE and EXPECT_PTRER Zhangjin Wu
2023-06-28 13:46 ` [PATCH v5 13/14] selftests/nolibc: add sbrk_0 to test current brk getting Zhangjin Wu
2023-06-28 13:51 ` [PATCH v5 14/14] selftests/nolibc: add mmap and munmap test cases Zhangjin Wu
2023-07-02 19:33 ` Willy Tarreau
2023-07-03 6:03 ` Zhangjin Wu
2023-07-03 7:25 ` Willy Tarreau
2023-07-03 8:06 ` Zhangjin Wu
2023-07-03 8:20 ` Thomas Weißschuh
2023-07-03 9:15 ` Zhangjin Wu
2023-07-03 9:56 ` Willy Tarreau
2023-07-03 11:24 ` Zhangjin Wu
2023-07-02 19:34 ` [PATCH v5 00/14] tools/nolibc: add a new syscall helper Willy Tarreau
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