linux-dev/include/asm-s390/ptrace.h, branch master

[S390] move include/asm-s390 to arch/s390/include/asm

2008-08-01T18:42:05Z

Signed-off-by: Martin Schwidefsky

[S390] Introduce user_regset accessors for s390

2008-07-14T08:02:09Z

Add the user_regset definitions for normal and compat processes, replace the dump_regs core dump cruft with the generic CORE_DUMP_USER_REGSET and replace binfmt_elf32.c with the generic compat_binfmt_elf.c implementation. Signed-off-by: Martin Schwidefsky Signed-off-by: Heiko Carstens

[S390] compat ptrace cleanup

2008-05-07T07:23:02Z

This removes redundant arch code for generic ptrace requests already handled by ptrace_request and compat_ptrace_request. It simplifies things to just have the standard entry points, and use the generic compat_sys_ptrace. Signed-off-by: Roland McGrath Signed-off-by: Martin Schwidefsky

[S390] use generic sys_ptrace

2008-04-30T11:38:48Z

After the PT_IEEE_IP hack has been removed s390 can now use the common code sys_ptrace function. Signed-off-by: Martin Schwidefsky

[S390] single-step cleanup

2008-01-26T13:11:27Z

Signed-off-by: Roland McGrath Signed-off-by: Martin Schwidefsky

[S390] Move psw_set_key.

2007-06-19T11:10:20Z

Move psw_set_key() from ptrace.h to processor.h which is a more suitable place for it. In addition the moves makes the function invisible to user space. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] noexec protection

2007-02-05T20:18:17Z

This provides a noexec protection on s390 hardware. Our hardware does not have any bits left in the pte for a hw noexec bit, so this is a different approach using shadow page tables and a special addressing mode that allows separate address spaces for code and data. As a special feature of our "secondary-space" addressing mode, separate page tables can be specified for the translation of data addresses (storage operands) and instruction addresses. The shadow page table is used for the instruction addresses and the standard page table for the data addresses. The shadow page table is linked to the standard page table by a pointer in page->lru.next of the struct page corresponding to the page that contains the standard page table (since page->private is not really private with the pte_lock and the page table pages are not in the LRU list). Depending on the software bits of a pte, it is either inserted into both page tables or just into the standard (data) page table. Pages of a vma that does not have the VM_EXEC bit set get mapped only in the data address space. Any try to execute code on such a page will cause a page translation exception. The standard reaction to this is a SIGSEGV with two exceptions: the two system call opcodes 0x0a77 (sys_sigreturn) and 0x0aad (sys_rt_sigreturn) are allowed. They are stored by the kernel to the signal stack frame. Unfortunately, the signal return mechanism cannot be modified to use an SA_RESTORER because the exception unwinding code depends on the system call opcode stored behind the signal stack frame. This feature requires that user space is executed in secondary-space mode and the kernel in home-space mode, which means that the addressing modes need to be switched and that the noexec protection only works for user space. After switching the addressing modes, we cannot use the mvcp/mvcs instructions anymore to copy between kernel and user space. A new mvcos instruction has been added to the z9 EC/BC hardware which allows to copy between arbitrary address spaces, but on older hardware the page tables need to be walked manually. Signed-off-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky

[PATCH] Add regs_return_value() helper

2006-10-02T14:57:16Z

Add the regs_return_value() macro to extract the return value in an architecture agnostic manner, given the pt_regs. Other architecture maintainers may want to add similar helpers. Signed-off-by: Ananth N Mavinakayanahalli Signed-off-by: Anil S Keshavamurthy Signed-off-by: Martin Schwidefsky Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[S390] Inline assembly cleanup.

2006-09-28T14:56:43Z

Major cleanup of all s390 inline assemblies. They now have a common coding style. Quite a few have been shortened, mainly by using register asm variables. Use of the EX_TABLE macro helps as well. The atomic ops, bit ops and locking inlines new use the Q-constraint if a newer gcc is used. That results in slightly better code. Thanks to Christian Borntraeger for proof reading the changes. Signed-off-by: Martin Schwidefsky

Don't include implementation details from asm-s390/ptrace.h and page.h

2006-04-27T03:47:10Z

Signed-off-by: David Woodhouse