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| author | David S. Miller <davem@davemloft.net> | 2008-05-08 01:21:28 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-05-08 01:21:28 +0200 |
| commit | 1e38c126c9252b612697e34f43b1b3371c8ee31d (patch) | |
| tree | 32f4d7635b9acb3c1210d46193ca777021fd52a3 /arch/sparc | |
| parent | sparc: Fix mmap VA span checking. (diff) | |
| download | linux-1e38c126c9252b612697e34f43b1b3371c8ee31d.tar.xz linux-1e38c126c9252b612697e34f43b1b3371c8ee31d.zip | |
sparc: Fix fork/clone/vfork system call restart.
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>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/kernel/process.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/arch/sparc/kernel/process.c b/arch/sparc/kernel/process.c index e7f35198ae34..36431f377dee 100644 --- a/arch/sparc/kernel/process.c +++ b/arch/sparc/kernel/process.c @@ -419,14 +419,26 @@ 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 |