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mn10300: switch to generic kernel_execve()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-09-19 13:18:20 -04:00
parent 8f1597e959
commit 6e75421014
6 changed files with 13 additions and 49 deletions
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2
arch/mn10300/include/asm/frame.inc
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@ -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

13
arch/mn10300/include/asm/processor.h
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@ -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;
}

1
arch/mn10300/include/asm/unistd.h
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@ -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

2
arch/mn10300/kernel/Makefile
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@ -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

7
arch/mn10300/kernel/entry.S
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@ -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

37
arch/mn10300/kernel/kernel_execve.S
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@ -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