system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-11-05 18:23:50 +00:00
Code Issues Projects Releases Packages Wiki Activity

[MIPS] Fix futex_atomic_op_inuser.

Browse source 
I found that NPTL's pthread_cond_signal() does not work properly on
kernels compiled by gcc 4.1.x.  I suppose inline asm for
__futex_atomic_op() was wrong.  I suppose:

1. "=&r" constraint should be used for oldval.
2. Instead of "r" (uaddr), "=R" (*uaddr) for output and "R" (*uaddr)
   for input should be used.
3. "memory" should be added to the clobber list.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2006-06-11 23:25:43 +09:00 committed by Ralf Baechle
parent e1701fb2e2
commit 0307e8d024
1 changed files with 17 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

32
include/asm-mips/futex.h
View file

@ -22,51 +22,53 @@
" .set push \n" \
" .set noat \n" \
" .set mips3 \n" \
"1: ll %1, (%3) # __futex_atomic_op \n" \
"1: ll %1, %4 # __futex_atomic_op \n" \
" .set mips0 \n" \
" " insn " \n" \
" .set mips3 \n" \
"2: sc $1, (%3) \n" \
"2: sc $1, %2 \n" \
" beqzl $1, 1b \n" \
__FUTEX_SMP_SYNC \
"3: \n" \
" .set pop \n" \
" .set mips0 \n" \
" .section .fixup,\"ax\" \n" \
"4: li %0, %5 \n" \
"4: li %0, %6 \n" \
" j 2b \n" \
" .previous \n" \
" .section __ex_table,\"a\" \n" \
" "__UA_ADDR "\t1b, 4b \n" \
" "__UA_ADDR "\t2b, 4b \n" \
" .previous \n" \
: "=r" (ret), "=r" (oldval) \
: "0" (0), "r" (uaddr), "Jr" (oparg), "i" (-EFAULT)); \
: "=r" (ret), "=&r" (oldval), "=R" (*uaddr) \
: "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT) \
: "memory"); \
} else if (cpu_has_llsc) { \
__asm__ __volatile__( \
" .set push \n" \
" .set noat \n" \
" .set mips3 \n" \
"1: ll %1, (%3) # __futex_atomic_op \n" \
"1: ll %1, %4 # __futex_atomic_op \n" \
" .set mips0 \n" \
" " insn " \n" \
" .set mips3 \n" \
"2: sc $1, (%3) \n" \
"2: sc $1, %2 \n" \
" beqz $1, 1b \n" \
__FUTEX_SMP_SYNC \
"3: \n" \
" .set pop \n" \
" .set mips0 \n" \
" .section .fixup,\"ax\" \n" \
"4: li %0, %5 \n" \
"4: li %0, %6 \n" \
" j 2b \n" \
" .previous \n" \
" .section __ex_table,\"a\" \n" \
" "__UA_ADDR "\t1b, 4b \n" \
" "__UA_ADDR "\t2b, 4b \n" \
" .previous \n" \
: "=r" (ret), "=r" (oldval) \
: "0" (0), "r" (uaddr), "Jr" (oparg), "i" (-EFAULT)); \
: "=r" (ret), "=&r" (oldval), "=R" (*uaddr) \
: "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT) \
: "memory"); \
} else \
ret = -ENOSYS; \
}
@ -89,23 +91,23 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
switch (op) {
case FUTEX_OP_SET:
__futex_atomic_op("move $1, %z4", ret, oldval, uaddr, oparg);
__futex_atomic_op("move $1, %z5", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ADD:
__futex_atomic_op("addu $1, %1, %z4",
__futex_atomic_op("addu $1, %1, %z5",
ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_OR:
__futex_atomic_op("or $1, %1, %z4",
__futex_atomic_op("or $1, %1, %z5",
ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ANDN:
__futex_atomic_op("and $1, %1, %z4",
__futex_atomic_op("and $1, %1, %z5",
ret, oldval, uaddr, ~oparg);
break;
case FUTEX_OP_XOR:
__futex_atomic_op("xor $1, %1, %z4",
__futex_atomic_op("xor $1, %1, %z5",
ret, oldval, uaddr, oparg);
break;
default: