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toolchain/uClubc-0.9.31: fix syscalls on MIPS
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20882 3c298f89-4303-0410-b956-a3cf2f4a3e73
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From 911bf867eb82e28799e81578c50d82ee166cebb5 Mon Sep 17 00:00:00 2001
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From: Gabor Juhos <juhosg@openwrt.org>
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Date: Tue, 6 Apr 2010 17:25:56 +0200
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Subject: [PATCH] MIPS: restore INLINE_SYSCALL macro
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The MIPS specific INLINE_SYSCALL macro has been renamed to
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INLINE_SYSCALL_NCS with:
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763bbf9e9a27426c9be8322dca5ddf2cb4dbc464
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syscall: unify part 2: NCS variety
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Declare common NCS (non-constant syscall) variants and convert the
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existing ports over to this.
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This change breaks system calls. The code generated with using of the
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new macro does not obey the restartable syscall convention used by the
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linux kernel. When it tries to restart the syscall the errno value is
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not being replaced by the syscall number.
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This causes weird behaviour of the 'ping' command in busybox for
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example:
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root@OpenWrt:/# ping 192.168.1.254
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PING 192.168.1.254 (192.168.1.254): 56 data bytes
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64 bytes from 192.168.1.254: seq=0 ttl=128 time=6.292 ms
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ping: recvfrom: Function not implemented
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64 bytes from 192.168.1.254: seq=1 ttl=128 time=0.719 ms
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ping: recvfrom: Function not implemented
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64 bytes from 192.168.1.254: seq=2 ttl=128 time=0.489 ms
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ping: recvfrom: Function not implemented
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64 bytes from 192.168.1.254: seq=3 ttl=128 time=0.486 ms
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ping: recvfrom: Function not implemented
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64 bytes from 192.168.1.254: seq=4 ttl=128 time=0.487 ms
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ping: recvfrom: Function not implemented
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64 bytes from 192.168.1.254: seq=5 ttl=128 time=0.939 ms
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ping: recvfrom: Function not implemented
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64 bytes from 192.168.1.254: seq=6 ttl=128 time=0.971 ms
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ping: recvfrom: Function not implemented
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64 bytes from 192.168.1.254: seq=7 ttl=128 time=0.488 ms
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ping: recvfrom: Funct^C
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--- 192.168.1.254 ping statistics ---
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9 packets transmitted, 9 packets received, 0% packet loss
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round-trip min/avg/max = 0.486/1.307/6.292 ms
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root@OpenWrt:/#
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Here is the relevant assembler code parts of the 'recvfrom' function:
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with the current INLINE_SYSCALL_NCS:
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00000000 <__GI_recvfrom>:
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...
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2c: 24021050 li v0,4176
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30: 8fd1003c lw s1,60(s8)
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34: 8fd00038 lw s0,56(s8)
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38: 27bdffe0 addiu sp,sp,-32
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3c: afb00010 sw s0,16(sp)
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40: afb10014 sw s1,20(sp) <-- wrong
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44: 0000000c syscall
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48: 27bd0020 addiu sp,sp,32
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...
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with the old INLINE_SYSCALL:
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00000000 <__libc_recvfrom>:
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...
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28: 8fd0003c lw s0,60(s8)
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2c: 8fc20038 lw v0,56(s8)
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30: 27bdffe0 addiu sp,sp,-32
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34: afa20010 sw v0,16(sp)
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38: afb00014 sw s0,20(sp)
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3c: 24021050 li v0,4176 <-- good
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40: 0000000c syscall
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44: 27bd0020 addiu sp,sp,32
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...
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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Cc: Mike Frysinger <vapier@gentoo.org>
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---
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Notes:
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The ideal solution would to fix the 'internal_syscall' macros to generate
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correct code for the NCS case as well. However the INLINE_SYSCALL macro
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generates smaller code if the syscall number is constant, so it is
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useful in such cases.
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Additionally, the current INLINE_SYSCALL_NCS in the 'mips/bits/syscall.h'
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is a duplicate of the one in the 'common/bits/syscalls-common.h' so it
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should be removed anyway.
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---
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libc/sysdeps/linux/mips/bits/syscalls.h | 4 ++--
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1 files changed, 2 insertions(+), 2 deletions(-)
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diff --git a/libc/sysdeps/linux/mips/bits/syscalls.h b/libc/sysdeps/linux/mips/bits/syscalls.h
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index 28b0f91..944d038 100644
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--- a/libc/sysdeps/linux/mips/bits/syscalls.h
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+++ b/libc/sysdeps/linux/mips/bits/syscalls.h
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@@ -19,9 +19,9 @@
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/* Define a macro which expands into the inline wrapper code for a system
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call. */
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-#define INLINE_SYSCALL_NCS(name, nr, args...) \
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+#define INLINE_SYSCALL(name, nr, args...) \
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({ INTERNAL_SYSCALL_DECL(err); \
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- long result_var = INTERNAL_SYSCALL_NCS (name, err, nr, args); \
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+ long result_var = INTERNAL_SYSCALL(name, err, nr, args); \
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if ( INTERNAL_SYSCALL_ERROR_P (result_var, err) ) \
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{ \
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__set_errno (INTERNAL_SYSCALL_ERRNO (result_var, err)); \
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--
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1.5.3.2
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