fab95c55e3
do_longjmp used to be needed when UML didn't have its own implementation of setjmp and longjmp. They came from libc, and couldn't be called directly from kernel code, as the libc jmp_buf couldn't be imported there. do_longjmp was a userspace function which served to provide longjmp access to kernel code. This is gone, and a number of void * pointers can now be jmp_buf *. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include "linux/stddef.h"
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#include "linux/fs.h"
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#include "linux/smp_lock.h"
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#include "linux/ptrace.h"
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#include "linux/sched.h"
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#include "asm/current.h"
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#include "asm/processor.h"
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#include "asm/uaccess.h"
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#include "mem_user.h"
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#include "skas.h"
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#include "os.h"
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void flush_thread(void)
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{
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void *data = NULL;
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unsigned long end = proc_mm ? task_size : CONFIG_STUB_START;
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int ret;
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arch_flush_thread(¤t->thread.arch);
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ret = unmap(¤t->mm->context.skas.id, 0, end, 1, &data);
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if (ret) {
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printk(KERN_ERR "flush_thread - clearing address space failed, "
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"err = %d\n", ret);
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force_sig(SIGKILL, current);
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}
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__switch_mm(¤t->mm->context.skas.id);
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}
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void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
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{
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set_fs(USER_DS);
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PT_REGS_IP(regs) = eip;
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PT_REGS_SP(regs) = esp;
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}
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#ifdef CONFIG_TTY_LOG
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extern void log_exec(char **argv, void *tty);
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#endif
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static long execve1(char *file, char __user * __user *argv,
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char __user *__user *env)
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{
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long error;
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#ifdef CONFIG_TTY_LOG
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struct tty_struct *tty;
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mutex_lock(&tty_mutex);
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tty = get_current_tty();
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if (tty)
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log_exec(argv, tty);
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mutex_unlock(&tty_mutex);
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#endif
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error = do_execve(file, argv, env, ¤t->thread.regs);
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if (error == 0) {
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task_lock(current);
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current->ptrace &= ~PT_DTRACE;
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#ifdef SUBARCH_EXECVE1
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SUBARCH_EXECVE1(¤t->thread.regs.regs);
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#endif
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task_unlock(current);
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}
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return error;
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}
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long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
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{
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long err;
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err = execve1(file, argv, env);
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if (!err)
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UML_LONGJMP(current->thread.exec_buf, 1);
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return err;
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}
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long sys_execve(char __user *file, char __user *__user *argv,
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char __user *__user *env)
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{
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long error;
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char *filename;
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lock_kernel();
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filename = getname(file);
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error = PTR_ERR(filename);
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if (IS_ERR(filename)) goto out;
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error = execve1(filename, argv, env);
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putname(filename);
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out:
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unlock_kernel();
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return error;
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}
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