3c91735099
fork on UML has always somewhat subtle. The underlying cause has been the need to initialize a stack for the new process. The only portable way to initialize a new stack is to set it as the alternate signal stack and take a signal. The signal handler does whatever initialization is needed and jumps back to the original stack, where the fork processing is finished. The basic context switching mechanism is a jmp_buf for each process. You switch to a new process by longjmping to its jmp_buf. Now that UML has its own implementation of setjmp and longjmp, and I can poke around inside a jmp_buf without fear that libc will change the structure, a much simpler mechanism is possible. The jmpbuf can simply be initialized by hand. This eliminates - the need to set up and remove the alternate signal stack sending and handling a signal the signal blocking needed around the stack switching, since there is no stack switching setting up the jmp_buf needed to jump back to the original stack after the new one is set up In addition, since jmp_buf is now defined by UML, and not by libc, it can be embedded in the thread struct. This makes it unnecessary to have it exist on the stack, where it used to be. It also simplifies interfaces, since the switch jmp_buf used to be a void * inside the thread struct, and functions which took it as an argument needed to define a jmp_buf variable and assign it from the void *. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
25 lines
623 B
C
25 lines
623 B
C
/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#ifndef __SKAS_H
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#define __SKAS_H
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#include "mm_id.h"
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#include "sysdep/ptrace.h"
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extern int userspace_pid[];
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extern int proc_mm, ptrace_faultinfo, ptrace_ldt;
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extern int skas_needs_stub;
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extern int user_thread(unsigned long stack, int flags);
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extern void new_thread_handler(void);
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extern void handle_syscall(union uml_pt_regs *regs);
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extern int new_mm(unsigned long stack);
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extern void get_skas_faultinfo(int pid, struct faultinfo * fi);
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extern long execute_syscall_skas(void *r);
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extern unsigned long current_stub_stack(void);
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#endif
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