mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-15 13:38:27 +02:00
111 lines
4.0 KiB
Diff
111 lines
4.0 KiB
Diff
|
From 911bf867eb82e28799e81578c50d82ee166cebb5 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Gabor Juhos <juhosg@openwrt.org>
|
||
|
|
Date: Tue, 6 Apr 2010 17:25:56 +0200
|
||
|
|
Subject: [PATCH] MIPS: restore INLINE_SYSCALL macro
|
||
|
|
|
||
|
|
The MIPS specific INLINE_SYSCALL macro has been renamed to
|
||
|
|
INLINE_SYSCALL_NCS with:
|
||
|
|
|
||
|
|
763bbf9e9a27426c9be8322dca5ddf2cb4dbc464
|
||
|
|
|
||
|
|
syscall: unify part 2: NCS variety
|
||
|
|
|
||
|
|
Declare common NCS (non-constant syscall) variants and convert the
|
||
|
|
existing ports over to this.
|
||
|
|
|
||
|
|
This change breaks system calls. The code generated with using of the
|
||
|
|
new macro does not obey the restartable syscall convention used by the
|
||
|
|
linux kernel. When it tries to restart the syscall the errno value is
|
||
|
|
not being replaced by the syscall number.
|
||
|
|
|
||
|
|
This causes weird behaviour of the 'ping' command in busybox for
|
||
|
|
example:
|
||
|
|
|
||
|
|
root@OpenWrt:/# ping 192.168.1.254
|
||
|
|
PING 192.168.1.254 (192.168.1.254): 56 data bytes
|
||
|
|
64 bytes from 192.168.1.254: seq=0 ttl=128 time=6.292 ms
|
||
|
|
ping: recvfrom: Function not implemented
|
||
|
|
64 bytes from 192.168.1.254: seq=1 ttl=128 time=0.719 ms
|
||
|
|
ping: recvfrom: Function not implemented
|
||
|
|
64 bytes from 192.168.1.254: seq=2 ttl=128 time=0.489 ms
|
||
|
|
ping: recvfrom: Function not implemented
|
||
|
|
64 bytes from 192.168.1.254: seq=3 ttl=128 time=0.486 ms
|
||
|
|
ping: recvfrom: Function not implemented
|
||
|
|
64 bytes from 192.168.1.254: seq=4 ttl=128 time=0.487 ms
|
||
|
|
ping: recvfrom: Function not implemented
|
||
|
|
64 bytes from 192.168.1.254: seq=5 ttl=128 time=0.939 ms
|
||
|
|
ping: recvfrom: Function not implemented
|
||
|
|
64 bytes from 192.168.1.254: seq=6 ttl=128 time=0.971 ms
|
||
|
|
ping: recvfrom: Function not implemented
|
||
|
|
64 bytes from 192.168.1.254: seq=7 ttl=128 time=0.488 ms
|
||
|
|
ping: recvfrom: Funct^C
|
||
|
|
--- 192.168.1.254 ping statistics ---
|
||
|
|
9 packets transmitted, 9 packets received, 0% packet loss
|
||
|
|
round-trip min/avg/max = 0.486/1.307/6.292 ms
|
||
|
|
root@OpenWrt:/#
|
||
|
|
|
||
|
|
Here is the relevant assembler code parts of the 'recvfrom' function:
|
||
|
|
|
||
|
|
with the current INLINE_SYSCALL_NCS:
|
||
|
|
00000000 <__GI_recvfrom>:
|
||
|
|
...
|
||
|
|
2c: 24021050 li v0,4176
|
||
|
|
30: 8fd1003c lw s1,60(s8)
|
||
|
|
34: 8fd00038 lw s0,56(s8)
|
||
|
|
38: 27bdffe0 addiu sp,sp,-32
|
||
|
|
3c: afb00010 sw s0,16(sp)
|
||
|
|
40: afb10014 sw s1,20(sp) <-- wrong
|
||
|
|
44: 0000000c syscall
|
||
|
|
48: 27bd0020 addiu sp,sp,32
|
||
|
|
...
|
||
|
|
|
||
|
|
with the old INLINE_SYSCALL:
|
||
|
|
00000000 <__libc_recvfrom>:
|
||
|
|
...
|
||
|
|
28: 8fd0003c lw s0,60(s8)
|
||
|
|
2c: 8fc20038 lw v0,56(s8)
|
||
|
|
30: 27bdffe0 addiu sp,sp,-32
|
||
|
|
34: afa20010 sw v0,16(sp)
|
||
|
|
38: afb00014 sw s0,20(sp)
|
||
|
|
3c: 24021050 li v0,4176 <-- good
|
||
|
|
40: 0000000c syscall
|
||
|
|
44: 27bd0020 addiu sp,sp,32
|
||
|
|
...
|
||
|
|
|
||
|
|
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
|
||
|
|
Cc: Mike Frysinger <vapier@gentoo.org>
|
||
|
|
---
|
||
|
|
Notes:
|
||
|
|
|
||
|
|
The ideal solution would to fix the 'internal_syscall' macros to generate
|
||
|
|
correct code for the NCS case as well. However the INLINE_SYSCALL macro
|
||
|
|
generates smaller code if the syscall number is constant, so it is
|
||
|
|
useful in such cases.
|
||
|
|
|
||
|
|
Additionally, the current INLINE_SYSCALL_NCS in the 'mips/bits/syscall.h'
|
||
|
|
is a duplicate of the one in the 'common/bits/syscalls-common.h' so it
|
||
|
|
should be removed anyway.
|
||
|
|
---
|
||
|
|
libc/sysdeps/linux/mips/bits/syscalls.h | 4 ++--
|
||
|
|
1 files changed, 2 insertions(+), 2 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/libc/sysdeps/linux/mips/bits/syscalls.h b/libc/sysdeps/linux/mips/bits/syscalls.h
|
||
|
|
index 28b0f91..944d038 100644
|
||
|
|
--- a/libc/sysdeps/linux/mips/bits/syscalls.h
|
||
|
|
+++ b/libc/sysdeps/linux/mips/bits/syscalls.h
|
||
|
|
@@ -19,9 +19,9 @@
|
||
|
|
|
||
|
|
/* Define a macro which expands into the inline wrapper code for a system
|
||
|
|
call. */
|
||
|
|
-#define INLINE_SYSCALL_NCS(name, nr, args...) \
|
||
|
|
+#define INLINE_SYSCALL(name, nr, args...) \
|
||
|
|
({ INTERNAL_SYSCALL_DECL(err); \
|
||
|
|
- long result_var = INTERNAL_SYSCALL_NCS (name, err, nr, args); \
|
||
|
|
+ long result_var = INTERNAL_SYSCALL(name, err, nr, args); \
|
||
|
|
if ( INTERNAL_SYSCALL_ERROR_P (result_var, err) ) \
|
||
|
|
{ \
|
||
|
|
__set_errno (INTERNAL_SYSCALL_ERRNO (result_var, err)); \
|
||
|
|
--
|
||
|
|
1.5.3.2
|
||
|
|
|