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openrisc: Add clone3 ABI wrapper

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[ Upstream commit 433fe39f67 ]

Like fork and clone the clone3 syscall needs a wrapper to save callee
saved registers, which is required by the OpenRISC ABI.  This came up
after auditing code following a discussion with Rob Landley and Arnd
Bergmann [0].

Tested with the clone3 kselftests and there were no issues.

[0] https://lore.kernel.org/all/41206fc7-f8ce-98aa-3718-ba3e1431e320@landley.net/T/#m9c0cdb2703813b9df4da04cf6b30de1f1aa89944

Fixes: 07e83dfbe1 ("openrisc: Enable the clone3 syscall")
Cc: Rob Landley <rob@landley.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Stafford Horne 2021-12-04 07:10:18 +09:00 committed by Greg Kroah-Hartman
parent 7a9ad4aceb
commit 37fb3dec66
2 changed files with 7 additions and 0 deletions
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2
arch/openrisc/include/asm/syscalls.h
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@ -22,9 +22,11 @@ asmlinkage long sys_or1k_atomic(unsigned long type, unsigned long *v1,
asmlinkage long __sys_clone(unsigned long clone_flags, unsigned long newsp,
void __user *parent_tid, void __user *child_tid, int tls);
asmlinkage long __sys_clone3(struct clone_args __user *uargs, size_t size);
asmlinkage long __sys_fork(void);
#define sys_clone __sys_clone
#define sys_clone3 __sys_clone3
#define sys_fork __sys_fork
#endif /* __ASM_OPENRISC_SYSCALLS_H */

5
arch/openrisc/kernel/entry.S
View File

@ -1170,6 +1170,11 @@ ENTRY(__sys_clone)
l.j _fork_save_extra_regs_and_call
l.nop
ENTRY(__sys_clone3)
l.movhi r29,hi(sys_clone3)
l.j _fork_save_extra_regs_and_call
l.ori r29,r29,lo(sys_clone3)
ENTRY(__sys_fork)
l.movhi r29,hi(sys_fork)
l.ori r29,r29,lo(sys_fork)