--- Makefile | 8 +++++ clone_ppc64.c | 1 + clone_ppc64_.S | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 105 insertions(+), 0 deletions(-) create mode 100644 clone_ppc64.c create mode 100644 clone_ppc64_.S diff --git a/Makefile b/Makefile index 35188f9..11db11f 100644 --- a/Makefile +++ b/Makefile @@ -45,6 +45,14 @@ endif # on powerpc, need also assembly file ifeq ($(SUBARCH),ppc) +CFLAGS += -m32 +ASFLAGS += -m32 +restart: clone_$(SUBARCH)_.o +nsexeccwp: clone_$(SUBARCH)_.o +endif +ifeq ($(SUBARCH),ppc64) +CFLAGS += -m64 +ASFLAGS += -m64 restart: clone_$(SUBARCH)_.o nsexeccwp: clone_$(SUBARCH)_.o endif diff --git a/clone_ppc64.c b/clone_ppc64.c new file mode 100644 index 0000000..5aec466 --- /dev/null +++ b/clone_ppc64.c @@ -0,0 +1 @@ +#include "clone_ppc.c" diff --git a/clone_ppc64_.S b/clone_ppc64_.S new file mode 100644 index 0000000..9fa71e7 --- /dev/null +++ b/clone_ppc64_.S @@ -0,0 +1,96 @@ +/* + * clone_ppc64_.S: ppc64 support for eclone() + * + * Author: Nathan Lynch <ntl@xxxxxxxxx> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of the Linux + * distribution for more details. + */ + +#include <asm/unistd.h> +#include "powerpc_asm.h" + +#ifndef __powerpc64__ +#error This code is 64-bit only! +#endif + +#ifndef __NR_eclone +#define __NR_eclone 323 +#endif + +/* int [r3] eclone(int (*fn)(void *arg) [r3], + * int flags [r4], + * void *fn_arg [r5], + * struct clone_args *args [r6], + * size_t args_size [r7], + * pid_t *pids [r8]); + * Creates a child task with the pids specified by pids. + * Returns to parent only, child execution and exit is handled here. + * On error, returns negated errno. On success, returns the pid of the child + * created. + */ + +.text + .global __eclone + .section ".opd","aw" + .align 3 +__eclone: + .quad .__eclone,.TOC.@tocbase,0 + .previous + .global .__eclone +.__eclone: + /* Set up parent's stack frame. */ + stdu r1,-80(r1) + + /* Save non-volatiles */ + std r30,64(r1) + std r31,72(r1) + + /* Save fn and fn_arg across system call */ + mr r30,r3 + mr r31,r5 + + /* Set up arguments for system call. */ + mr r3,r4 /* flags */ + mr r4,r6 /* clone_args */ + mr r5,r7 /* clone_args' size */ + mr r6,r8 /* pids */ + + /* Do the system call */ + li r0,__NR_eclone + sc + + /* Parent or child? */ + cmpdi cr1,r3,0 + crandc 4*cr1+eq,4*cr1+eq,4*cr0+so + bne cr1,eclone_parent + + /* Child. Call fn. */ + std r2,40(r1) /* save TOC base */ + ld r0,0(r30) /* extract fn pointer from descriptor */ + ld r2,8(r30) /* extract TOC base from descriptor */ + mtctr r0 + mr r3,r31 /* fn argument */ + bctrl + ld r2,40(r1) /* restore TOC base */ + + /* Assume result of fn in r3 and exit. */ + li r0,__NR_exit + sc + +eclone_parent: + /* Restore non-volatiles. */ + ld r31,72(r1) + ld r30,64(r1) + + addi r1,r1,80 + + /* Return to caller on success. */ + bnslr + + /* Handle error. Negate the return value to signal an error + * to the caller, which must set errno. + */ + neg r3,r3 + blr -- 1.6.0.6 _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
