Home Home > GIT Browse
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorDavid S. Miller <davem@davemloft.net>2008-05-07 16:21:28 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2008-05-15 07:50:01 -0700
commitb94377177b13fd73a75b0a7cc4e5f5ea4912b71d (patch)
treee757d5c4a233ed115bf3495fff432719027cdced
parent742de58a7b519a51ea77153b6e053223eb6ccbaf (diff)
sparc: Fix fork/clone/vfork system call restart.
[ Upstream commit: 1e38c126c9252b612697e34f43b1b3371c8ee31d ] We clobber %i1 as well as %i0 for these system calls, because they give two return values. Therefore, on error, we have to restore %i1 properly or else the restart explodes since it uses the wrong arguments. This fixes glibc's nptl/tst-eintr1.c testcase. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--arch/sparc/kernel/process.c20
-rw-r--r--arch/sparc64/kernel/process.c18
2 files changed, 31 insertions, 7 deletions
diff --git a/arch/sparc/kernel/process.c b/arch/sparc/kernel/process.c
index 70c0dd22491d..709de5ec373b 100644
--- a/arch/sparc/kernel/process.c
+++ b/arch/sparc/kernel/process.c
@@ -421,14 +421,26 @@ asmlinkage int sparc_do_fork(unsigned long clone_flags,
unsigned long stack_size)
{
unsigned long parent_tid_ptr, child_tid_ptr;
+ unsigned long orig_i1 = regs->u_regs[UREG_I1];
+ long ret;
parent_tid_ptr = regs->u_regs[UREG_I2];
child_tid_ptr = regs->u_regs[UREG_I4];
- return do_fork(clone_flags, stack_start,
- regs, stack_size,
- (int __user *) parent_tid_ptr,
- (int __user *) child_tid_ptr);
+ ret = do_fork(clone_flags, stack_start,
+ regs, stack_size,
+ (int __user *) parent_tid_ptr,
+ (int __user *) child_tid_ptr);
+
+ /* If we get an error and potentially restart the system
+ * call, we're screwed because copy_thread() clobbered
+ * the parent's %o1. So detect that case and restore it
+ * here.
+ */
+ if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
+ regs->u_regs[UREG_I1] = orig_i1;
+
+ return ret;
}
/* Copy a Sparc thread. The fork() return value conventions
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index acf8c5250aa9..334e64cc6c2b 100644
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -507,6 +507,8 @@ asmlinkage long sparc_do_fork(unsigned long clone_flags,
unsigned long stack_size)
{
int __user *parent_tid_ptr, *child_tid_ptr;
+ unsigned long orig_i1 = regs->u_regs[UREG_I1];
+ long ret;
#ifdef CONFIG_COMPAT
if (test_thread_flag(TIF_32BIT)) {
@@ -519,9 +521,19 @@ asmlinkage long sparc_do_fork(unsigned long clone_flags,
child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
}
- return do_fork(clone_flags, stack_start,
- regs, stack_size,
- parent_tid_ptr, child_tid_ptr);
+ ret = do_fork(clone_flags, stack_start,
+ regs, stack_size,
+ parent_tid_ptr, child_tid_ptr);
+
+ /* If we get an error and potentially restart the system
+ * call, we're screwed because copy_thread() clobbered
+ * the parent's %o1. So detect that case and restore it
+ * here.
+ */
+ if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
+ regs->u_regs[UREG_I1] = orig_i1;
+
+ return ret;
}
/* Copy a Sparc thread. The fork() return value conventions