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authorAl Viro <viro@zeniv.linux.org.uk>2012-09-19 13:18:20 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-10-01 00:53:59 -0400
commit6e75421014cd02cc66298d35c4667e493da78914 (patch)
treeb8c917bb766efc2396a7693b305e33e0c37e3a53 /arch/mn10300
parent8f1597e959a3cfeae8f5cfae26890710f9092443 (diff)
downloadlinux-linaro-stable-6e75421014cd02cc66298d35c4667e493da78914.tar.gz
mn10300: switch to generic kernel_execve()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/mn10300')
-rw-r--r--arch/mn10300/include/asm/frame.inc2
-rw-r--r--arch/mn10300/include/asm/processor.h13
-rw-r--r--arch/mn10300/include/asm/unistd.h1
-rw-r--r--arch/mn10300/kernel/Makefile2
-rw-r--r--arch/mn10300/kernel/entry.S7
-rw-r--r--arch/mn10300/kernel/kernel_execve.S37
6 files changed, 13 insertions, 49 deletions
diff --git a/arch/mn10300/include/asm/frame.inc b/arch/mn10300/include/asm/frame.inc
index 2ee58e3eb6b3..1c3eb4fda958 100644
--- a/arch/mn10300/include/asm/frame.inc
+++ b/arch/mn10300/include/asm/frame.inc
@@ -61,7 +61,7 @@
###############################################################################
.macro RESTORE_ALL
# peel back the stack to the calling frame
- # - this permits execve() to discard extra frames due to kernel syscalls
+ # - we need that when returning from interrupts to kernel mode
GET_THREAD_INFO a0
mov (TI_frame,a0),fp
mov fp,sp
diff --git a/arch/mn10300/include/asm/processor.h b/arch/mn10300/include/asm/processor.h
index 247928c9f549..0b844a254067 100644
--- a/arch/mn10300/include/asm/processor.h
+++ b/arch/mn10300/include/asm/processor.h
@@ -119,20 +119,13 @@ struct thread_struct {
/*
* do necessary setup to start up a newly executed thread
- * - need to discard the frame stacked by the kernel thread invoking the execve
- * syscall (see RESTORE_ALL macro)
*/
static inline void start_thread(struct pt_regs *regs,
unsigned long new_pc, unsigned long new_sp)
{
- struct thread_info *ti = current_thread_info();
- struct pt_regs *frame0;
-
- frame0 = thread_info_to_uregs(ti);
- frame0->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
- frame0->pc = new_pc;
- frame0->sp = new_sp;
- ti->frame = frame0;
+ regs->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
+ regs->pc = new_pc;
+ regs->sp = new_sp;
}
diff --git a/arch/mn10300/include/asm/unistd.h b/arch/mn10300/include/asm/unistd.h
index a965de47b2bd..044c770adbb6 100644
--- a/arch/mn10300/include/asm/unistd.h
+++ b/arch/mn10300/include/asm/unistd.h
@@ -383,6 +383,7 @@
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls
diff --git a/arch/mn10300/kernel/Makefile b/arch/mn10300/kernel/Makefile
index 142c12906682..561029f7fa44 100644
--- a/arch/mn10300/kernel/Makefile
+++ b/arch/mn10300/kernel/Makefile
@@ -8,7 +8,7 @@ fpu-obj-$(CONFIG_FPU) := fpu.o fpu-low.o
obj-y := process.o signal.o entry.o traps.o irq.o \
ptrace.o setup.o time.o sys_mn10300.o io.o \
- switch_to.o mn10300_ksyms.o kernel_execve.o $(fpu-obj-y) \
+ switch_to.o mn10300_ksyms.o $(fpu-obj-y) \
csrc-mn10300.o cevt-mn10300.o
obj-$(CONFIG_SMP) += smp.o smp-low.o
diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index 000f144230a5..7dee5f6a1416 100644
--- a/arch/mn10300/kernel/entry.S
+++ b/arch/mn10300/kernel/entry.S
@@ -62,6 +62,13 @@ ENTRY(ret_from_kernel_thread)
calls (a0)
jmp sys_exit
+ENTRY(ret_from_kernel_execve)
+ add -12,d0 /* pt_regs -> frame */
+ mov d0,sp
+ GET_THREAD_INFO a2
+ clr d0
+ jmp syscall_exit
+
###############################################################################
#
# system call handler
diff --git a/arch/mn10300/kernel/kernel_execve.S b/arch/mn10300/kernel/kernel_execve.S
deleted file mode 100644
index 86039f105268..000000000000
--- a/arch/mn10300/kernel/kernel_execve.S
+++ /dev/null
@@ -1,37 +0,0 @@
-/* MN10300 In-kernel program execution
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-#include <linux/linkage.h>
-#include <asm/unistd.h>
-
-###############################################################################
-#
-# Do a system call from kernel instead of calling sys_execve so we end up with
-# proper pt_regs.
-#
-# int kernel_execve(const char *filename, char *const argv[],
-# char *const envp[])
-#
-# On entry: D0/D1/8(SP): arguments to function
-# On return: D0: syscall return.
-#
-###############################################################################
- .globl kernel_execve
- .type kernel_execve,@function
-kernel_execve:
- mov a3,a1
- mov d0,a0
- mov (12,sp),a3
- mov +__NR_execve,d0
- syscall 0
- mov a1,a3
- rets
-
- .size kernel_execve,.-kernel_execve