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sparc: share process creation helpers between sparc and sparc64

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As promised in the previous patch, this moves the process creation
helpers into a common process.c file that is shared between sparc and
sparc64. It allows us to get rid of quite a bit custom assembler and the
to remove the separe 32bit specific sparc_do_fork() call.

One thing to note, is that when clone() was called with a separate stack
for the child the assembler would align it. But copy_thread() has always
been doing that too so that line wasn't needed and can thus simply be
removed.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Guo Ren <guoren@kernel.org>
Cc: linux-csky@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Link: https://lore.kernel.org/r/20200512171527.570109-3-christian.brauner@ubuntu.com
This commit is contained in:
Christian Brauner
2020-05-12 19:15:26 +02:00
parent dcad2a62bc
commit a4261d4bb4
6 changed files with 123 additions and 149 deletions
Download Patch File Download Diff File Expand all files Collapse all files

94
arch/sparc/kernel/process_64.c
View File

@@ -572,100 +572,6 @@ barf:
force_sig(SIGSEGV);
}
asmlinkage long sparc_fork(struct pt_regs *regs)
{
unsigned long orig_i1 = regs->u_regs[UREG_I1];
long ret;
struct kernel_clone_args args = {
.exit_signal = SIGCHLD,
/* Reuse the parent's stack for the child. */
.stack = regs->u_regs[UREG_FP],
};
ret = _do_fork(&args);
/* If we get an error and potentially restart the system
* call, we're screwed because copy_thread_tls() 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;
}
asmlinkage long sparc_vfork(struct pt_regs *regs)
{
unsigned long orig_i1 = regs->u_regs[UREG_I1];
long ret;
struct kernel_clone_args args = {
.flags = CLONE_VFORK | CLONE_VM,
.exit_signal = SIGCHLD,
/* Reuse the parent's stack for the child. */
.stack = regs->u_regs[UREG_FP],
};
ret = _do_fork(&args);
/* If we get an error and potentially restart the system
* call, we're screwed because copy_thread_tls() 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;
}
asmlinkage long sparc_clone(struct pt_regs *regs)
{
unsigned long orig_i1 = regs->u_regs[UREG_I1];
unsigned int flags = lower_32_bits(regs->u_regs[UREG_I0]);
long ret;
struct kernel_clone_args args = {
.flags = (flags & ~CSIGNAL),
.exit_signal = (flags & CSIGNAL),
.tls = regs->u_regs[UREG_I3],
};
#ifdef CONFIG_COMPAT
if (test_thread_flag(TIF_32BIT)) {
args.pidfd = compat_ptr(regs->u_regs[UREG_I2]);
args.child_tid = compat_ptr(regs->u_regs[UREG_I4]);
args.parent_tid = compat_ptr(regs->u_regs[UREG_I2]);
} else
#endif
{
args.pidfd = (int __user *)regs->u_regs[UREG_I2];
args.child_tid = (int __user *)regs->u_regs[UREG_I4];
args.parent_tid = (int __user *)regs->u_regs[UREG_I2];
}
/* Did userspace setup a separate stack for the child or are we
* copying the parent's?
*/
if (regs->u_regs[UREG_I1])
args.stack = regs->u_regs[UREG_I1];
else
args.stack = regs->u_regs[UREG_FP];
ret = _do_fork(&args);
/* If we get an error and potentially restart the system
* call, we're screwed because copy_thread_tls() 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
* under SunOS are nothing short of bletcherous:
* Parent --> %o0 == childs pid, %o1 == 0