* [PATCH] LoongArch: Add syscall.c for getting correct return value
@ 2022-11-23 1:57 Xing Li
2022-11-23 3:40 ` Xi Ruoyao via Libc-alpha
0 siblings, 1 reply; 4+ messages in thread
From: Xing Li @ 2022-11-23 1:57 UTC (permalink / raw)
To: adhemerval.zanella
Cc: libc-alpha, i.swmail, xry111, caiyinyu, wanghongliang, hejinyang,
Xing Li
The __SYS_mmap syscall should return 47bits value. If we use
the common syscall interface which defined in
sysdeps/unix/sysv/linux/syscall.c, the syscall return value
is 32bits with sign extend, which lead to mmap failure.
Testcase:
#include <sys/syscall.h>
#include <sys/mman.h>
#include <stdio.h>
void main()
{
long int ret;
ret = syscall(SYS_mmap, NULL, 0x801000, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
printf("map address is %lx\n",ret);
}
Result:
[lixing@Sunhaiyong test]$ ./mmap
map address is fffffffff008c000
* sysdeps/unix/sysv/linux/loongarch/syscall.c: New file
---
sysdeps/unix/sysv/linux/loongarch/syscall.c | 34 +++++++++++++++++++++
1 file changed, 34 insertions(+)
create mode 100644 sysdeps/unix/sysv/linux/loongarch/syscall.c
diff --git a/sysdeps/unix/sysv/linux/loongarch/syscall.c b/sysdeps/unix/sysv/linux/loongarch/syscall.c
new file mode 100644
index 0000000000..fe9672a403
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/syscall.c
@@ -0,0 +1,34 @@
+/* system call interface. Linux/LoongArch version.
+ Copyright (C) 2001-2022 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
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+long int
+syscall (long int syscall_number, long int arg1, long int arg2, long int arg3,
+ long int arg4, long int arg5, long int arg6, long int arg7)
+{
+ long int ret;
+
+ ret = INTERNAL_SYSCALL_NCS_CALL (syscall_number, arg1, arg2, arg3, arg4,
+ arg5, arg6, arg7);
+
+ if (INTERNAL_SYSCALL_ERROR_P (ret))
+ return __syscall_error (ret);
+
+ return ret;
+}
--
2.37.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] LoongArch: Add syscall.c for getting correct return value
2022-11-23 1:57 [PATCH] LoongArch: Add syscall.c for getting correct return value Xing Li
@ 2022-11-23 3:40 ` Xi Ruoyao via Libc-alpha
2022-11-23 13:36 ` Adhemerval Zanella Netto via Libc-alpha
0 siblings, 1 reply; 4+ messages in thread
From: Xi Ruoyao via Libc-alpha @ 2022-11-23 3:40 UTC (permalink / raw)
To: Xing Li, adhemerval.zanella
Cc: libc-alpha, i.swmail, caiyinyu, wanghongliang, hejinyang
On Wed, 2022-11-23 at 09:57 +0800, Xing Li wrote:
> The __SYS_mmap syscall should return 47bits value. If we use
> the common syscall interface which defined in
> sysdeps/unix/sysv/linux/syscall.c, the syscall return value
> is 32bits with sign extend, which lead to mmap failure.
Could we just change
int r = INTERNAL_SYSCALL_NCS_CALL (number, a0, a1, a2, a3, a4, a5);
in sysdeps/unix/sysv/linux/syscall.c to "long r = ..." instead?
>
> Testcase:
>
> #include <sys/syscall.h>
> #include <sys/mman.h>
> #include <stdio.h>
>
> void main()
> {
> long int ret;
> ret = syscall(SYS_mmap, NULL, 0x801000, PROT_READ |
> PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
> printf("map address is %lx\n",ret);
> }
>
> Result:
> [lixing@Sunhaiyong test]$ ./mmap
> map address is fffffffff008c000
>
> * sysdeps/unix/sysv/linux/loongarch/syscall.c: New file
> ---
> sysdeps/unix/sysv/linux/loongarch/syscall.c | 34
> +++++++++++++++++++++
> 1 file changed, 34 insertions(+)
> create mode 100644 sysdeps/unix/sysv/linux/loongarch/syscall.c
>
> diff --git a/sysdeps/unix/sysv/linux/loongarch/syscall.c
> b/sysdeps/unix/sysv/linux/loongarch/syscall.c
> new file mode 100644
> index 0000000000..fe9672a403
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/loongarch/syscall.c
> @@ -0,0 +1,34 @@
> +/* system call interface. Linux/LoongArch version.
> + Copyright (C) 2001-2022 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
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be
> useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <sysdep.h>
> +
> +long int
> +syscall (long int syscall_number, long int arg1, long int arg2, long
> int arg3,
> + long int arg4, long int arg5, long int arg6, long int arg7)
> +{
> + long int ret;
> +
> + ret = INTERNAL_SYSCALL_NCS_CALL (syscall_number, arg1, arg2, arg3,
> arg4,
> + arg5, arg6, arg7);
> +
> + if (INTERNAL_SYSCALL_ERROR_P (ret))
> + return __syscall_error (ret);
> +
> + return ret;
> +}
--
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] LoongArch: Add syscall.c for getting correct return value
2022-11-23 3:40 ` Xi Ruoyao via Libc-alpha
@ 2022-11-23 13:36 ` Adhemerval Zanella Netto via Libc-alpha
2022-11-25 2:37 ` XingLi
0 siblings, 1 reply; 4+ messages in thread
From: Adhemerval Zanella Netto via Libc-alpha @ 2022-11-23 13:36 UTC (permalink / raw)
To: Xi Ruoyao, Xing Li
Cc: libc-alpha, i.swmail, caiyinyu, wanghongliang, hejinyang
On 23/11/22 00:40, Xi Ruoyao wrote:
> On Wed, 2022-11-23 at 09:57 +0800, Xing Li wrote:
>> The __SYS_mmap syscall should return 47bits value. If we use
>> the common syscall interface which defined in
>> sysdeps/unix/sysv/linux/syscall.c, the syscall return value
>> is 32bits with sign extend, which lead to mmap failure.
>
> Could we just change
>
> int r = INTERNAL_SYSCALL_NCS_CALL (number, a0, a1, a2, a3, a4, a5);
>
> in sysdeps/unix/sysv/linux/syscall.c to "long r = ..." instead?
>
Yes, afaik INTERNAL_SYSCALL_NCS on all architecture returns long int.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] LoongArch: Add syscall.c for getting correct return value
2022-11-23 13:36 ` Adhemerval Zanella Netto via Libc-alpha
@ 2022-11-25 2:37 ` XingLi
0 siblings, 0 replies; 4+ messages in thread
From: XingLi @ 2022-11-25 2:37 UTC (permalink / raw)
To: Adhemerval Zanella Netto, Xi Ruoyao
Cc: libc-alpha, i.swmail, caiyinyu, wanghongliang, hejinyang
在 2022/11/23 下午9:36, Adhemerval Zanella Netto 写道:
>
>
> On 23/11/22 00:40, Xi Ruoyao wrote:
>> On Wed, 2022-11-23 at 09:57 +0800, Xing Li wrote:
>>> The __SYS_mmap syscall should return 47bits value. If we use
>>> the common syscall interface which defined in
>>> sysdeps/unix/sysv/linux/syscall.c, the syscall return value
>>> is 32bits with sign extend, which lead to mmap failure.
>>
>> Could we just change
>>
>> int r = INTERNAL_SYSCALL_NCS_CALL (number, a0, a1, a2, a3, a4, a5);
>>
>> in sysdeps/unix/sysv/linux/syscall.c to "long r = ..." instead?
>>
>
> Yes, afaik INTERNAL_SYSCALL_NCS on all architecture returns long int.
>
Yes, the __SYSCALL_DEFINEx all returns long in linux kernel.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-11-25 2:37 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-11-23 1:57 [PATCH] LoongArch: Add syscall.c for getting correct return value Xing Li
2022-11-23 3:40 ` Xi Ruoyao via Libc-alpha
2022-11-23 13:36 ` Adhemerval Zanella Netto via Libc-alpha
2022-11-25 2:37 ` XingLi
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).