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OpenCloudOS-Kernel
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sh: Consolidate addr/access_ok across mmu/nommu on 32bit. 

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2008-06-03 19:38:22 +09:00
parent 85247285ea
commit 31f6a11fe7
1 changed files with 3 additions and 36 deletions
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39
include/asm-sh/uaccess_32.h
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@ -19,26 +19,8 @@
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#if !defined(CONFIG_MMU)
/* NOMMU is always true */
#define __addr_ok(addr) (1)
/*
* __access_ok: Check if address with size is OK or not.
*
* If we don't have an MMU (or if its disabled) the only thing we really have
* to look out for is if the address resides somewhere outside of what
* available RAM we have.
*/
static inline int __access_ok(unsigned long addr, unsigned long size)
{
return 1;
}
#else /* CONFIG_MMU */
#define __addr_ok(addr) \
((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
/*
* __access_ok: Check if address with size is OK or not.
@ -48,23 +30,8 @@ static inline int __access_ok(unsigned long addr, unsigned long size)
* sum := addr + size; carry? --> flag = true;
* if (sum >= addr_limit) flag = true;
*/
static inline int __access_ok(unsigned long addr, unsigned long size)
{
unsigned long flag, sum;
__asm__("clrt\n\t"
"addc %3, %1\n\t"
"movt %0\n\t"
"cmp/hi %4, %1\n\t"
"rotcl %0"
:"=&r" (flag), "=r" (sum)
:"1" (addr), "r" (size),
"r" (current_thread_info()->addr_limit.seg)
:"t");
return flag == 0;
}
#endif /* CONFIG_MMU */
#define __access_ok(addr, size) \
(__addr_ok((addr) + (size)))
#define access_ok(type, addr, size) \
(__chk_user_ptr(addr), \
__access_ok((unsigned long __force)(addr), (size)))