From e8bb2a2a1d51511e6b3f7e08125d52ec73c11139 Mon Sep 17 00:00:00 2001 From: Kars de Jong Date: Sun, 24 Nov 2019 20:52:25 +0100 Subject: m68k: Wire up clone3() syscall Wire up the clone3() syscall for m68k. The special entry point is done in assembler as was done for clone() as well. This is needed because all registers need to be saved. The C wrapper then calls the generic sys_clone3() with the correct arguments. Tested on A1200 using the simple test program from: https://lore.kernel.org/lkml/20190716130631.tohj4ub54md25dys@brauner.io/ Signed-off-by: Kars de Jong Link: https://lore.kernel.org/r/20191124195225.31230-1-jongk@linux-m68k.org Signed-off-by: Geert Uytterhoeven --- arch/m68k/kernel/entry.S | 7 +++++++ arch/m68k/kernel/process.c | 13 ++++++++++++- arch/m68k/kernel/syscalls/syscall.tbl | 2 +- 3 files changed, 20 insertions(+), 2 deletions(-) (limited to 'arch/m68k/kernel') diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S index 97cd3ea5f10b..9dd76fbb7c6b 100644 --- a/arch/m68k/kernel/entry.S +++ b/arch/m68k/kernel/entry.S @@ -69,6 +69,13 @@ ENTRY(__sys_vfork) lea %sp@(24),%sp rts +ENTRY(__sys_clone3) + SAVE_SWITCH_STACK + pea %sp@(SWITCH_STACK_SIZE) + jbsr m68k_clone3 + lea %sp@(28),%sp + rts + ENTRY(sys_sigreturn) SAVE_SWITCH_STACK movel %sp,%sp@- | switch_stack pointer diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c index 4e77a06735c1..22e6b8f4f958 100644 --- a/arch/m68k/kernel/process.c +++ b/arch/m68k/kernel/process.c @@ -30,8 +30,9 @@ #include #include #include - +#include #include + #include #include #include @@ -119,6 +120,16 @@ asmlinkage int m68k_clone(struct pt_regs *regs) (int __user *)regs->d3, (int __user *)regs->d4); } +/* + * Because extra registers are saved on the stack after the sys_clone3() + * arguments, this C wrapper extracts them from pt_regs * and then calls the + * generic sys_clone3() implementation. + */ +asmlinkage int m68k_clone3(struct pt_regs *regs) +{ + return sys_clone3((struct clone_args __user *)regs->d1, regs->d2); +} + int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, struct task_struct *p) { diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl index a88a285a0e5f..a00a5d0db602 100644 --- a/arch/m68k/kernel/syscalls/syscall.tbl +++ b/arch/m68k/kernel/syscalls/syscall.tbl @@ -434,4 +434,4 @@ 432 common fsmount sys_fsmount 433 common fspick sys_fspick 434 common pidfd_open sys_pidfd_open -# 435 reserved for clone3 +435 common clone3 __sys_clone3 -- cgit v1.2.3