42859eea96
Pull generic execve() changes from Al Viro: "This introduces the generic kernel_thread() and kernel_execve() functions, and switches x86, arm, alpha, um and s390 over to them." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (26 commits) s390: convert to generic kernel_execve() s390: switch to generic kernel_thread() s390: fold kernel_thread_helper() into ret_from_fork() s390: fold execve_tail() into start_thread(), convert to generic sys_execve() um: switch to generic kernel_thread() x86, um/x86: switch to generic sys_execve and kernel_execve x86: split ret_from_fork alpha: introduce ret_from_kernel_execve(), switch to generic kernel_execve() alpha: switch to generic kernel_thread() alpha: switch to generic sys_execve() arm: get rid of execve wrapper, switch to generic execve() implementation arm: optimized current_pt_regs() arm: introduce ret_from_kernel_execve(), switch to generic kernel_execve() arm: split ret_from_fork, simplify kernel_thread() [based on patch by rmk] generic sys_execve() generic kernel_execve() new helper: current_pt_regs() preparation for generic kernel_thread() um: kill thread->forking um: let signal_delivered() do SIGTRAP on singlestepping into handler ...
55 lines
1.3 KiB
C
55 lines
1.3 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/module.h>
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#include <linux/fs.h>
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#include <linux/ptrace.h>
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#include <linux/sched.h>
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#include <linux/slab.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 <as-layout.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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int ret;
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arch_flush_thread(¤t->thread.arch);
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ret = unmap(¤t->mm->context.id, 0, STUB_START, 0, &data);
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ret = ret || unmap(¤t->mm->context.id, STUB_END,
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host_task_size - STUB_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.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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get_safe_registers(regs->regs.gp, regs->regs.fp);
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PT_REGS_IP(regs) = eip;
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PT_REGS_SP(regs) = esp;
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current->ptrace &= ~PT_DTRACE;
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#ifdef SUBARCH_EXECVE1
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SUBARCH_EXECVE1(regs->regs);
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#endif
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}
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EXPORT_SYMBOL(start_thread);
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void __noreturn ret_from_kernel_execve(struct pt_regs *unused)
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{
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UML_LONGJMP(current->thread.exec_buf, 1);
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}
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