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authorAl Viro <viro@zeniv.linux.org.uk>2012-10-27 00:03:41 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-11-28 22:43:40 -0500
commitf3268edbe6fe0ce56e62c6d6b14640aeb04864b7 (patch)
tree1ff80222598a1f259ab1910affe0740478090369 /arch/microblaze/kernel
parentf01aceac61ad5cc9ea463f6bb185c1f72702357f (diff)
downloadlinux-f3268edbe6fe0ce56e62c6d6b14640aeb04864b7.tar.gz
microblaze: switch to generic fork/vfork/clone
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'arch/microblaze/kernel')
-rw-r--r--arch/microblaze/kernel/entry-nommu.S8
-rw-r--r--arch/microblaze/kernel/entry.S26
-rw-r--r--arch/microblaze/kernel/process.c8
-rw-r--r--arch/microblaze/kernel/sys_microblaze.c14
-rw-r--r--arch/microblaze/kernel/syscall_table.S6
5 files changed, 6 insertions, 56 deletions
diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S
index 673a49c04a0..cb0327f204a 100644
--- a/arch/microblaze/kernel/entry-nommu.S
+++ b/arch/microblaze/kernel/entry-nommu.S
@@ -559,14 +559,6 @@ no_work_pending:
rtid r14, 0
nop
-sys_vfork:
- brid microblaze_vfork
- addk r5, r1, r0
-
-sys_clone:
- brid microblaze_clone
- addk r7, r1, r0
-
sys_rt_sigreturn_wrapper:
brid sys_rt_sigreturn
addk r5, r1, r0
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index 10f360ed82b..c217367dfc7 100644
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -442,18 +442,6 @@ TRAP_return: /* Make global symbol for debugging */
nop;
-/* These syscalls need access to the struct pt_regs on the stack, so we
- implement them in assembly (they're basically all wrappers anyway). */
-
-C_ENTRY(sys_fork_wrapper):
- addi r5, r0, SIGCHLD /* Arg 0: flags */
- lwi r6, r1, PT_R1 /* Arg 1: child SP (use parent's) */
- addik r7, r1, 0 /* Arg 2: parent context */
- add r8, r0, r0 /* Arg 3: (unused) */
- add r9, r0, r0; /* Arg 4: (unused) */
- brid do_fork /* Do real work (tail-call) */
- add r10, r0, r0; /* Arg 5: (unused) */
-
/* This the initial entry point for a new child thread, with an appropriate
stack in place that makes it look the the child is in the middle of an
syscall. This function is actually `returned to' from switch_thread
@@ -475,20 +463,6 @@ C_ENTRY(ret_from_kernel_thread):
brid ret_from_trap
add r3, r0, r0
-C_ENTRY(sys_vfork):
- brid microblaze_vfork /* Do real work (tail-call) */
- addik r5, r1, 0
-
-C_ENTRY(sys_clone):
- bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */
- lwi r6, r1, PT_R1; /* If so, use paret's stack ptr */
-1: addik r7, r1, 0; /* Arg 2: parent context */
- lwi r9, r1, PT_R8; /* parent tid. */
- lwi r10, r1, PT_R9; /* child tid. */
- /* do_fork will pick up TLS from regs->r10. */
- brid do_fork /* Do real work (tail-call) */
- add r8, r0, r0; /* Arg 3: (unused) */
-
C_ENTRY(sys_rt_sigreturn_wrapper):
brid sys_rt_sigreturn /* Do real work */
addik r5, r1, 0; /* add user context as 1st arg */
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 29768c3dc35..a5fed8db726 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -13,6 +13,7 @@
#include <linux/pm.h>
#include <linux/tick.h>
#include <linux/bitops.h>
+#include <linux/ptrace.h>
#include <asm/pgalloc.h>
#include <asm/uaccess.h> /* for USER_DS macros */
#include <asm/cacheflush.h>
@@ -120,7 +121,7 @@ void flush_thread(void)
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long arg,
- struct task_struct *p, struct pt_regs *regs)
+ struct task_struct *p, struct pt_regs *unused)
{
struct pt_regs *childregs = task_pt_regs(p);
struct thread_info *ti = task_thread_info(p);
@@ -141,8 +142,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
return 0;
}
- *childregs = *regs;
- childregs->r1 = usp;
+ *childregs = *current_pt_regs();
+ if (usp)
+ childregs->r1 = usp;
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
ti->cpu_context.r1 = (unsigned long)childregs;
diff --git a/arch/microblaze/kernel/sys_microblaze.c b/arch/microblaze/kernel/sys_microblaze.c
index a6a7bae9f5c..63647c586b4 100644
--- a/arch/microblaze/kernel/sys_microblaze.c
+++ b/arch/microblaze/kernel/sys_microblaze.c
@@ -34,20 +34,6 @@
#include <asm/syscalls.h>
-asmlinkage long microblaze_vfork(struct pt_regs *regs)
-{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1,
- regs, 0, NULL, NULL);
-}
-
-asmlinkage long microblaze_clone(int flags, unsigned long stack,
- struct pt_regs *regs)
-{
- if (!stack)
- stack = regs->r1;
- return do_fork(flags, stack, regs, 0, NULL, NULL);
-}
-
asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t pgoff)
diff --git a/arch/microblaze/kernel/syscall_table.S b/arch/microblaze/kernel/syscall_table.S
index 6a2b294ef6d..ff6431e5468 100644
--- a/arch/microblaze/kernel/syscall_table.S
+++ b/arch/microblaze/kernel/syscall_table.S
@@ -2,11 +2,7 @@ ENTRY(sys_call_table)
.long sys_restart_syscall /* 0 - old "setup()" system call,
* used for restarting */
.long sys_exit
-#ifdef CONFIG_MMU
- .long sys_fork_wrapper
-#else
- .long sys_ni_syscall
-#endif
+ .long sys_fork
.long sys_read
.long sys_write
.long sys_open /* 5 */