2006-01-08 02:01:31 -07:00
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/*
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2007-10-16 02:27:00 -06:00
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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2005-04-16 16:20:36 -06:00
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* Licensed under the GPL
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*/
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#ifndef __KERN_UTIL_H__
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#define __KERN_UTIL_H__
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2012-10-07 20:27:32 -06:00
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#include <sysdep/ptrace.h>
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#include <sysdep/faultinfo.h>
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2012-08-01 16:49:17 -06:00
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struct siginfo;
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2008-02-04 23:31:08 -07:00
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extern int uml_exitcode;
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2005-04-16 16:20:36 -06:00
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extern int ncpus;
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extern int kmalloc_ok;
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#define UML_ROUND_UP(addr) \
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((((unsigned long) addr) + PAGE_SIZE - 1) & PAGE_MASK)
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2005-04-16 16:20:36 -06:00
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extern unsigned long alloc_stack(int order, int atomic);
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2008-02-04 23:30:46 -07:00
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extern void free_stack(unsigned long stack, int order);
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2015-07-03 13:44:20 -06:00
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struct pt_regs;
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extern void do_signal(struct pt_regs *regs);
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2008-02-04 23:30:46 -07:00
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extern void interrupt_end(void);
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2012-08-01 16:49:17 -06:00
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extern void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs);
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2008-02-04 23:30:46 -07:00
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[PATCH] uml: S390 preparation, abstract host page fault data
This patch removes the arch-specific fault/trap-infos from thread and
skas-regs.
It adds a new struct faultinfo, that is arch-specific defined in
sysdep/faultinfo.h.
The structure is inserted in thread.arch and thread.regs.skas and
thread.regs.tt
Now, segv and other trap-handlers can copy the contents from regs.X.faultinfo
to thread.arch.faultinfo with one simple assignment.
Also, the number of macros necessary is reduced to
FAULT_ADDRESS(struct faultinfo)
extracts the faulting address from faultinfo
FAULT_WRITE(struct faultinfo)
extracts the "is_write" flag
SEGV_IS_FIXABLE(struct faultinfo)
is true for the fixable segvs, i.e. (TRAP == 14)
on i386
UPT_FAULTINFO(regs)
result is (struct faultinfo *) to the faultinfo
in regs->skas.faultinfo
GET_FAULTINFO_FROM_SC(struct faultinfo, struct sigcontext *)
copies the relevant parts of the sigcontext to
struct faultinfo.
On SIGSEGV, call user_signal() instead of handle_segv(), if the architecture
provides the information needed in PTRACE_FAULTINFO, or if PTRACE_FAULTINFO is
missing, because segv-stub will provide the info.
The benefit of the change is, that in case of a non-fixable SIGSEGV, we can
give user processes a SIGSEGV, instead of possibly looping on pagefault
handling.
Since handle_segv() sikked arch_fixup() implicitly by passing ip==0 to segv(),
I changed segv() to call arch_fixup() only, if !is_user.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-05 17:15:31 -06:00
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extern unsigned long segv(struct faultinfo fi, unsigned long ip,
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int is_user, struct uml_pt_regs *regs);
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extern int handle_page_fault(unsigned long address, unsigned long ip,
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int is_write, int is_user, int *code_out);
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2007-10-16 02:26:58 -06:00
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extern unsigned int do_IRQ(int irq, struct uml_pt_regs *regs);
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extern int smp_sigio_handler(void);
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extern void initial_thread_cb(void (*proc)(void *), void *arg);
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extern int is_syscall(unsigned long addr);
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[PATCH] uml: clean arch_switch usage
Call arch_switch also in switch_to_skas, even if it's, for now, a no-op for
that case (and mark this in the comment); this will change soon.
Also, arch_switch for TT mode is actually useless when the PT proxy (a
complicate debugging instrumentation for TT mode) is not enabled. In fact, it
only calls update_debugregs, which checks debugregs_seq against seq (to check
if the registers are up-to-date - seq here means a "version number" of the
registers).
If the ptrace proxy is not enabled, debugregs_seq always stays 0 and
update_debugregs will be a no-op. So, optimize this out (the compiler can't
do it).
Also, I've been disappointed by the fact that it would make a lot of sense if,
after calling a successful
update_debugregs(current->thread.arch.debugregs_seq),
current->thread.arch.debugregs_seq were updated with the new debugregs_seq.
But this is not done. Is this a bug or a feature? For all purposes, it seems
a bug (otherwise the whole mechanism does not make sense, which is also a
possibility to check), which causes some performance only problems (not
correctness), since we write_debugregs when not needed.
Also, as suggested by Jeff, remove a redundant enabling of SIGVTALRM,
comprised in the subsequent local_irq_enable(). I'm just a bit dubious if
ordering matters there...
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-31 03:30:21 -07:00
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2012-08-01 16:49:17 -06:00
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extern void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
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extern int start_uml(void);
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extern void paging_init(void);
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2006-01-18 18:42:58 -07:00
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2008-02-04 23:30:46 -07:00
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extern void uml_cleanup(void);
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extern void do_uml_exitcalls(void);
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2006-06-04 03:51:46 -06:00
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2008-02-04 23:30:46 -07:00
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/*
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* Are we disallowed to sleep? Used to choose between GFP_KERNEL and
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* GFP_ATOMIC.
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*/
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2006-01-18 18:42:58 -07:00
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extern int __cant_sleep(void);
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2012-01-30 14:30:48 -07:00
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extern int get_current_pid(void);
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extern int copy_from_user_proc(void *to, void *from, int size);
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extern int cpu(void);
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extern char *uml_strdup(const char *string);
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uml: fix irqstack crash
This patch fixes a crash caused by an interrupt coming in when an IRQ stack
is being torn down. When this happens, handle_signal will loop, setting up
the IRQ stack again because the tearing down had finished, and handling
whatever signals had come in.
However, to_irq_stack returns a mask of pending signals to be handled, plus
bit zero is set if the IRQ stack was already active, and thus shouldn't be
torn down. This causes a problem because when handle_signal goes around
the loop, sig will be zero, and to_irq_stack will duly set bit zero in the
returned mask, faking handle_signal into believing that it shouldn't tear
down the IRQ stack and return thread_info pointers back to their original
values.
This will eventually cause a crash, as the IRQ stack thread_info will
continue pointing to the original task_struct and an interrupt will look
into it after it has been freed.
The fix is to stop passing a signal number into to_irq_stack. Rather, the
pending signals mask is initialized beforehand with the bit for sig already
set. References to sig in to_irq_stack can be replaced with references to
the mask.
[akpm@linux-foundation.org: use UL]
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>
2007-09-18 23:46:49 -06:00
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extern unsigned long to_irq_stack(unsigned long *mask_out);
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2008-02-04 23:30:46 -07:00
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extern unsigned long from_irq_stack(int nested);
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extern void syscall_trace(struct uml_pt_regs *regs, int entryexit);
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extern int singlestepping(void *t);
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2012-08-01 16:49:17 -06:00
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extern void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
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extern void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs);
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extern void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
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extern void fatal_sigsegv(void) __attribute__ ((noreturn));
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2005-04-16 16:20:36 -06:00
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#endif
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