powerpc: Wire up clone3 syscall

Wire up the new clone3 syscall added in commit 7f192e3cd3 ("fork:
add clone3").

This requires a ppc_clone3 wrapper, in order to save the non-volatile
GPRs before calling into the generic syscall code. Otherwise we hit
the BUG_ON in CHECK_FULL_REGS in copy_thread().

Lightly tested using Christian's test code on a Power8 LE VM.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Christian Brauner <christian@brauner.io>
Link: https://lore.kernel.org/r/20190724140259.23554-1-mpe@ellerman.id.au
This commit is contained in:
Michael Ellerman 2019-07-22 22:26:56 +10:00
parent 609488bc97
commit cee3536d24
4 changed files with 15 additions and 1 deletions

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@ -49,6 +49,7 @@
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_VFORK
#define __ARCH_WANT_SYS_CLONE
#define __ARCH_WANT_SYS_CLONE3
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_UNISTD_H_ */

View File

@ -597,6 +597,14 @@ ppc_clone:
stw r0,_TRAP(r1) /* register set saved */
b sys_clone
.globl ppc_clone3
ppc_clone3:
SAVE_NVGPRS(r1)
lwz r0,_TRAP(r1)
rlwinm r0,r0,0,0,30 /* clear LSB to indicate full */
stw r0,_TRAP(r1) /* register set saved */
b sys_clone3
.globl ppc_swapcontext
ppc_swapcontext:
SAVE_NVGPRS(r1)

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@ -487,6 +487,11 @@ _GLOBAL(ppc_clone)
bl sys_clone
b .Lsyscall_exit
_GLOBAL(ppc_clone3)
bl save_nvgprs
bl sys_clone3
b .Lsyscall_exit
_GLOBAL(ppc32_swapcontext)
bl save_nvgprs
bl compat_sys_swapcontext

View File

@ -516,4 +516,4 @@
432 common fsmount sys_fsmount
433 common fspick sys_fspick
434 common pidfd_open sys_pidfd_open
# 435 reserved for clone3
435 nospu clone3 ppc_clone3