2005-04-16 22:20:36 +00:00
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/*
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* Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include "linux/kernel.h"
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#include "asm/errno.h"
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#include "linux/sched.h"
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#include "linux/mm.h"
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#include "linux/spinlock.h"
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#include "linux/config.h"
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#include "linux/init.h"
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#include "linux/ptrace.h"
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#include "asm/semaphore.h"
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#include "asm/pgtable.h"
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#include "asm/pgalloc.h"
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#include "asm/tlbflush.h"
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#include "asm/a.out.h"
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#include "asm/current.h"
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#include "asm/irq.h"
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2005-09-23 04:44:16 +00:00
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#include "sysdep/sigcontext.h"
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2005-04-16 22:20:36 +00:00
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#include "user_util.h"
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#include "kern_util.h"
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#include "kern.h"
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#include "chan_kern.h"
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#include "mconsole_kern.h"
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#include "mem.h"
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#include "mem_kern.h"
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2005-09-03 22:57:26 +00:00
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/* Note this is constrained to return 0, -EFAULT, -EACCESS, -ENOMEM by segv(). */
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2005-04-16 22:20:36 +00:00
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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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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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int err = -EFAULT;
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*code_out = SEGV_MAPERR;
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down_read(&mm->mmap_sem);
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vma = find_vma(mm, address);
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if(!vma)
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goto out;
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else if(vma->vm_start <= address)
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goto good_area;
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else if(!(vma->vm_flags & VM_GROWSDOWN))
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goto out;
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2005-05-07 04:30:55 +00:00
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else if(is_user && !ARCH_IS_STACKGROW(address))
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2005-04-16 22:20:36 +00:00
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goto out;
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else if(expand_stack(vma, address))
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goto out;
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2005-09-03 22:57:26 +00:00
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good_area:
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2005-04-16 22:20:36 +00:00
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*code_out = SEGV_ACCERR;
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if(is_write && !(vma->vm_flags & VM_WRITE))
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goto out;
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2005-05-20 20:59:08 +00:00
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2005-09-10 17:44:57 +00:00
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/* Don't require VM_READ|VM_EXEC for write faults! */
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if(!is_write && !(vma->vm_flags & (VM_READ | VM_EXEC)))
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2005-05-20 20:59:08 +00:00
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goto out;
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2005-04-16 22:20:36 +00:00
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do {
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2005-09-03 22:57:26 +00:00
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survive:
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2005-04-16 22:20:36 +00:00
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switch (handle_mm_fault(mm, vma, address, is_write)){
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case VM_FAULT_MINOR:
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current->min_flt++;
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break;
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case VM_FAULT_MAJOR:
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current->maj_flt++;
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break;
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case VM_FAULT_SIGBUS:
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err = -EACCES;
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goto out;
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case VM_FAULT_OOM:
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err = -ENOMEM;
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goto out_of_memory;
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default:
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BUG();
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}
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2005-09-03 22:57:26 +00:00
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pgd = pgd_offset(mm, address);
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pud = pud_offset(pgd, address);
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pmd = pmd_offset(pud, address);
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pte = pte_offset_kernel(pmd, address);
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2005-04-16 22:20:36 +00:00
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} while(!pte_present(*pte));
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err = 0;
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2005-09-10 17:44:58 +00:00
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WARN_ON(!pte_young(*pte) || (is_write && !pte_dirty(*pte)));
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2005-09-03 22:57:26 +00:00
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flush_tlb_page(vma, address);
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out:
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2005-04-16 22:20:36 +00:00
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up_read(&mm->mmap_sem);
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return(err);
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/*
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* We ran out of memory, or some other thing happened to us that made
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* us unable to handle the page fault gracefully.
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*/
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out_of_memory:
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if (current->pid == 1) {
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up_read(&mm->mmap_sem);
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yield();
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down_read(&mm->mmap_sem);
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goto survive;
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}
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goto out;
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}
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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 23:15:31 +00:00
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/*
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* We give a *copy* of the faultinfo in the regs to segv.
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* This must be done, since nesting SEGVs could overwrite
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* the info in the regs. A pointer to the info then would
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* give us bad data!
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*/
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unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user, void *sc)
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2005-04-16 22:20:36 +00:00
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{
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struct siginfo si;
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void *catcher;
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int err;
|
[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 23:15:31 +00:00
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int is_write = FAULT_WRITE(fi);
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unsigned long address = FAULT_ADDRESS(fi);
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2005-04-16 22:20:36 +00:00
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if(!is_user && (address >= start_vm) && (address < end_vm)){
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flush_tlb_kernel_vm();
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return(0);
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}
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else if(current->mm == NULL)
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panic("Segfault with no mm");
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2005-09-23 04:44:16 +00:00
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if (SEGV_IS_FIXABLE(&fi))
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err = handle_page_fault(address, ip, is_write, is_user, &si.si_code);
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else {
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err = -EFAULT;
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/* A thread accessed NULL, we get a fault, but CR2 is invalid.
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* This code is used in __do_copy_from_user() of TT mode. */
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address = 0;
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}
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2005-04-16 22:20:36 +00:00
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catcher = current->thread.fault_catcher;
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if(!err)
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return(0);
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else if(catcher != NULL){
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current->thread.fault_addr = (void *) address;
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do_longjmp(catcher, 1);
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}
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else if(current->thread.fault_addr != NULL)
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panic("fault_addr set but no fault catcher");
|
[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 23:15:31 +00:00
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else if(!is_user && arch_fixup(ip, sc))
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2005-04-16 22:20:36 +00:00
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return(0);
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if(!is_user)
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panic("Kernel mode fault at addr 0x%lx, ip 0x%lx",
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address, ip);
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2005-09-03 22:57:26 +00:00
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if (err == -EACCES) {
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2005-04-16 22:20:36 +00:00
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si.si_signo = SIGBUS;
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si.si_errno = 0;
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si.si_code = BUS_ADRERR;
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si.si_addr = (void *)address;
|
[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 23:15:31 +00:00
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current->thread.arch.faultinfo = fi;
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2005-04-16 22:20:36 +00:00
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force_sig_info(SIGBUS, &si, current);
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2005-09-03 22:57:26 +00:00
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} else if (err == -ENOMEM) {
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2005-04-16 22:20:36 +00:00
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printk("VM: killing process %s\n", current->comm);
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do_exit(SIGKILL);
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2005-09-03 22:57:26 +00:00
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} else {
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BUG_ON(err != -EFAULT);
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2005-04-16 22:20:36 +00:00
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si.si_signo = SIGSEGV;
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si.si_addr = (void *) address;
|
[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 23:15:31 +00:00
|
|
|
current->thread.arch.faultinfo = fi;
|
2005-04-16 22:20:36 +00:00
|
|
|
force_sig_info(SIGSEGV, &si, current);
|
|
|
|
}
|
|
|
|
return(0);
|
|
|
|
}
|
|
|
|
|
[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 23:15:31 +00:00
|
|
|
void bad_segv(struct faultinfo fi, unsigned long ip)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct siginfo si;
|
|
|
|
|
|
|
|
si.si_signo = SIGSEGV;
|
|
|
|
si.si_code = SEGV_ACCERR;
|
[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 23:15:31 +00:00
|
|
|
si.si_addr = (void *) FAULT_ADDRESS(fi);
|
|
|
|
current->thread.arch.faultinfo = fi;
|
2005-04-16 22:20:36 +00:00
|
|
|
force_sig_info(SIGSEGV, &si, current);
|
|
|
|
}
|
|
|
|
|
|
|
|
void relay_signal(int sig, union uml_pt_regs *regs)
|
|
|
|
{
|
|
|
|
if(arch_handle_signal(sig, regs)) return;
|
|
|
|
if(!UPT_IS_USER(regs))
|
|
|
|
panic("Kernel mode signal %d", sig);
|
[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 23:15:31 +00:00
|
|
|
current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);
|
2005-04-16 22:20:36 +00:00
|
|
|
force_sig(sig, current);
|
|
|
|
}
|
|
|
|
|
|
|
|
void bus_handler(int sig, union uml_pt_regs *regs)
|
|
|
|
{
|
|
|
|
if(current->thread.fault_catcher != NULL)
|
|
|
|
do_longjmp(current->thread.fault_catcher, 1);
|
|
|
|
else relay_signal(sig, regs);
|
|
|
|
}
|
|
|
|
|
|
|
|
void winch(int sig, union uml_pt_regs *regs)
|
|
|
|
{
|
|
|
|
do_IRQ(WINCH_IRQ, regs);
|
|
|
|
}
|
|
|
|
|
|
|
|
void trap_init(void)
|
|
|
|
{
|
|
|
|
}
|