diff options
| author | Stafford Horne <shorne@gmail.com> | 2021-12-04 01:10:18 +0300 |
|---|---|---|
| committer | Stafford Horne <shorne@gmail.com> | 2021-12-04 05:12:09 +0300 |
| commit | 433fe39f674d58bc7a3e8254a5d2ffc290b7e04e (patch) | |
| tree | 759ed1ce58ef4251ecb9e969d78ad919e0066605 /arch/openrisc | |
| parent | 07baf50ac754384b9ea996f82b9a2a8aba946aa4 (diff) | |
| download | linux-433fe39f674d58bc7a3e8254a5d2ffc290b7e04e.tar.xz | |
openrisc: Add clone3 ABI wrapper
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: 07e83dfbe16c ("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>
Diffstat (limited to 'arch/openrisc')
| -rw-r--r-- | arch/openrisc/include/asm/syscalls.h | 2 | ||||
| -rw-r--r-- | arch/openrisc/kernel/entry.S | 5 |
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/openrisc/include/asm/syscalls.h b/arch/openrisc/include/asm/syscalls.h index 3a7eeae6f56a..aa1c7e98722e 100644 --- a/arch/openrisc/include/asm/syscalls.h +++ b/arch/openrisc/include/asm/syscalls.h @@ -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 */ diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index 8cd2113057c5..3ca1b1f490b9 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S @@ -1165,6 +1165,11 @@ ENTRY(__sys_clone) l.j _fork_save_extra_regs_and_call l.ori r29,r29,lo(sys_clone) +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.j _fork_save_extra_regs_and_call |