diff options
Diffstat (limited to 'mdk-stage1/dietlibc/ppc/clone.S')
-rw-r--r-- | mdk-stage1/dietlibc/ppc/clone.S | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/ppc/clone.S b/mdk-stage1/dietlibc/ppc/clone.S new file mode 100644 index 000000000..98f6bd4e8 --- /dev/null +++ b/mdk-stage1/dietlibc/ppc/clone.S @@ -0,0 +1,48 @@ +#include <dietfeatures.h> +#include "syscalls.h" +#include <errno.h> + +.text +.weak clone +clone: +.global __clone +__clone: + cmpwi 4,0 /* check have non null child_stack pointer */ + cmpwi cr1, 3,0 /* check have non null thread_funcion */ + cror eq,4*cr1+eq,eq /* now if eq is set one is or both are zero */ + beq .Lclone_error + + stwu 1,-32(1) /* alloc some space on the stack */ + stmw 29, 16(1) /* save r29,r30,r31 on stack */ + + rlwinm 4,4,0,0,27 /* mask out lower 4 bits */ + + /* move parameter to positions clone wants them */ + mr 29,3 /* r29 = r3 fn */ + mr 30,4 /* r30 = r4 stack */ + mr 31,6 /* r31 = r6 arg */ + mr 3, 5 /* r3 = r5 flags */ + + li 0, __NR_clone /* load syscall nr. */ + sc + + cmpwi cr1,3,0 /* compare return of syscall with 0 */ + crandc 4*cr1+eq,4*cr1+eq,so + bne .Lclone_parent /* return was non zero -> .Lclone_parent */ + + /* we are the cloned process */ + mr 1, 30 /* set stack pointer */ + mtctr 29 /* set count register to fn ? */ + mr 3, 31 /* set argument */ + bctrl /* branch trough count register and link */ + b _exit /* exit thread */ + +.Lclone_parent: + lmw 29,16(1) /* restore saved registers */ + addi 1, 1,32 /* free stack */ + bnslr+ /* had cloned a thread so return to parent */ + b error_unified_syscall + +.Lclone_error: + li 3, EINVAL + b error_unified_syscall |