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linux/arch/s390/include/asm/cacheflush.h

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
#ifndef _S390_CACHEFLUSH_H
#define _S390_CACHEFLUSH_H
/* Caches aren't brain-dead on the s390. */
[S390] use asm-generic/cacheflush.h The implementation of the cache flushing interfaces on the s390 is identical with the default implementation in asm-generic. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-31 18:30:07 +08:00
#include <asm-generic/cacheflush.h>
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
s390: add no-execute support Bit 0x100 of a page table, segment table of region table entry can be used to disallow code execution for the virtual addresses associated with the entry. There is one tricky bit, the system call to return from a signal is part of the signal frame written to the user stack. With a non-executable stack this would stop working. To avoid breaking things the protection fault handler checks the opcode that caused the fault for 0x0a77 (sys_sigreturn) and 0x0aad (sys_rt_sigreturn) and injects a system call. This is preferable to the alternative solution with a stub function in the vdso because it works for vdso=off and statically linked binaries as well. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-03-22 17:54:24 +08:00
#define SET_MEMORY_RO 1UL
#define SET_MEMORY_RW 2UL
#define SET_MEMORY_NX 4UL
#define SET_MEMORY_X 8UL
int __set_memory(unsigned long addr, int numpages, unsigned long flags);
static inline int set_memory_ro(unsigned long addr, int numpages)
{
return __set_memory(addr, numpages, SET_MEMORY_RO);
}
static inline int set_memory_rw(unsigned long addr, int numpages)
{
return __set_memory(addr, numpages, SET_MEMORY_RW);
}
static inline int set_memory_nx(unsigned long addr, int numpages)
{
return __set_memory(addr, numpages, SET_MEMORY_NX);
}
static inline int set_memory_x(unsigned long addr, int numpages)
{
return __set_memory(addr, numpages, SET_MEMORY_X);
}
[S390] Write protect module text and RO data Implement write protection for kernel modules text and read-only data sections by implementing set_memory_[ro|rw] on s390. Since s390 has no execute bit in the pte's NX is not supported. set_memory_[ro|rw] will only work on normal pages and not on large pages, so in case a large page should be modified bail out with a warning. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-03-16 00:08:22 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
#endif /* _S390_CACHEFLUSH_H */