4cb6066af9
For whatever reason GCC isn't able to figure things out in the control flow (in particular when min() and max() expressions are involved) on sparc as well as it can on x86. So lots of useless incorrect user copy warnings get spewed and the full-on compile failure mode of the user copy checks were never usable on sparc at all. People can debug these kinds of problems on x86. Signed-off-by: David S. Miller <davem@davemloft.net>
276 lines
8.6 KiB
C
276 lines
8.6 KiB
C
#ifndef _ASM_UACCESS_H
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#define _ASM_UACCESS_H
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/*
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* User space memory access functions
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*/
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#ifdef __KERNEL__
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#include <linux/errno.h>
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#include <linux/compiler.h>
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#include <linux/string.h>
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#include <linux/thread_info.h>
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#include <asm/asi.h>
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#include <asm/system.h>
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#include <asm/spitfire.h>
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#include <asm-generic/uaccess-unaligned.h>
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#endif
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#ifndef __ASSEMBLY__
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/*
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* Sparc64 is segmented, though more like the M68K than the I386.
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* We use the secondary ASI to address user memory, which references a
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* completely different VM map, thus there is zero chance of the user
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* doing something queer and tricking us into poking kernel memory.
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*
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* What is left here is basically what is needed for the other parts of
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* the kernel that expect to be able to manipulate, erum, "segments".
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* Or perhaps more properly, permissions.
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*
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* "For historical reasons, these macros are grossly misnamed." -Linus
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*/
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#define KERNEL_DS ((mm_segment_t) { ASI_P })
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#define USER_DS ((mm_segment_t) { ASI_AIUS }) /* har har har */
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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#define get_fs() ((mm_segment_t) { get_thread_current_ds() })
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#define get_ds() (KERNEL_DS)
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#define segment_eq(a,b) ((a).seg == (b).seg)
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#define set_fs(val) \
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do { \
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set_thread_current_ds((val).seg); \
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__asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \
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} while(0)
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static inline int __access_ok(const void __user * addr, unsigned long size)
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{
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return 1;
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}
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static inline int access_ok(int type, const void __user * addr, unsigned long size)
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{
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return 1;
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}
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/*
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* The exception table consists of pairs of addresses: the first is the
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* address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out
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* what to do.
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*
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* All the routines below use bits of fixup code that are out of line
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* with the main instruction path. This means when everything is well,
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* we don't even have to jump over them. Further, they do not intrude
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* on our cache or tlb entries.
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*/
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struct exception_table_entry {
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unsigned int insn, fixup;
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};
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extern void __ret_efault(void);
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extern void __retl_efault(void);
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/* Uh, these should become the main single-value transfer routines..
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* They automatically use the right size if we just have the right
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* pointer type..
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*
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* This gets kind of ugly. We want to return _two_ values in "get_user()"
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* and yet we don't want to do any pointers, because that is too much
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* of a performance impact. Thus we have a few rather ugly macros here,
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* and hide all the ugliness from the user.
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*/
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#define put_user(x,ptr) ({ \
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unsigned long __pu_addr = (unsigned long)(ptr); \
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__chk_user_ptr(ptr); \
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__put_user_nocheck((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); })
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#define get_user(x,ptr) ({ \
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unsigned long __gu_addr = (unsigned long)(ptr); \
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__chk_user_ptr(ptr); \
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__get_user_nocheck((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); })
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#define __put_user(x,ptr) put_user(x,ptr)
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#define __get_user(x,ptr) get_user(x,ptr)
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) ((struct __large_struct *)(x))
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#define __put_user_nocheck(data,addr,size) ({ \
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register int __pu_ret; \
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switch (size) { \
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case 1: __put_user_asm(data,b,addr,__pu_ret); break; \
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case 2: __put_user_asm(data,h,addr,__pu_ret); break; \
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case 4: __put_user_asm(data,w,addr,__pu_ret); break; \
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case 8: __put_user_asm(data,x,addr,__pu_ret); break; \
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default: __pu_ret = __put_user_bad(); break; \
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} __pu_ret; })
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#define __put_user_asm(x,size,addr,ret) \
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__asm__ __volatile__( \
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"/* Put user asm, inline. */\n" \
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"1:\t" "st"#size "a %1, [%2] %%asi\n\t" \
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"clr %0\n" \
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"2:\n\n\t" \
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".section .fixup,#alloc,#execinstr\n\t" \
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".align 4\n" \
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"3:\n\t" \
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"sethi %%hi(2b), %0\n\t" \
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"jmpl %0 + %%lo(2b), %%g0\n\t" \
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" mov %3, %0\n\n\t" \
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".previous\n\t" \
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".section __ex_table,\"a\"\n\t" \
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".align 4\n\t" \
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".word 1b, 3b\n\t" \
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".previous\n\n\t" \
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: "=r" (ret) : "r" (x), "r" (__m(addr)), \
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"i" (-EFAULT))
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extern int __put_user_bad(void);
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#define __get_user_nocheck(data,addr,size,type) ({ \
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register int __gu_ret; \
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register unsigned long __gu_val; \
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switch (size) { \
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case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
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case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
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case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
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case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
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default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
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} data = (type) __gu_val; __gu_ret; })
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#define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \
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register unsigned long __gu_val __asm__ ("l1"); \
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switch (size) { \
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case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
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case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
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case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
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case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
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default: if (__get_user_bad()) return retval; \
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} data = (type) __gu_val; })
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#define __get_user_asm(x,size,addr,ret) \
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__asm__ __volatile__( \
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"/* Get user asm, inline. */\n" \
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"1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \
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"clr %0\n" \
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"2:\n\n\t" \
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".section .fixup,#alloc,#execinstr\n\t" \
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".align 4\n" \
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"3:\n\t" \
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"sethi %%hi(2b), %0\n\t" \
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"clr %1\n\t" \
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"jmpl %0 + %%lo(2b), %%g0\n\t" \
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" mov %3, %0\n\n\t" \
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".previous\n\t" \
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".section __ex_table,\"a\"\n\t" \
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".align 4\n\t" \
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".word 1b, 3b\n\n\t" \
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".previous\n\t" \
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: "=r" (ret), "=r" (x) : "r" (__m(addr)), \
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"i" (-EFAULT))
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#define __get_user_asm_ret(x,size,addr,retval) \
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if (__builtin_constant_p(retval) && retval == -EFAULT) \
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__asm__ __volatile__( \
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"/* Get user asm ret, inline. */\n" \
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"1:\t" "ld"#size "a [%1] %%asi, %0\n\n\t" \
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".section __ex_table,\"a\"\n\t" \
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".align 4\n\t" \
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".word 1b,__ret_efault\n\n\t" \
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".previous\n\t" \
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: "=r" (x) : "r" (__m(addr))); \
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else \
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__asm__ __volatile__( \
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"/* Get user asm ret, inline. */\n" \
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"1:\t" "ld"#size "a [%1] %%asi, %0\n\n\t" \
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".section .fixup,#alloc,#execinstr\n\t" \
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".align 4\n" \
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"3:\n\t" \
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"ret\n\t" \
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" restore %%g0, %2, %%o0\n\n\t" \
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".previous\n\t" \
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".section __ex_table,\"a\"\n\t" \
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".align 4\n\t" \
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".word 1b, 3b\n\n\t" \
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".previous\n\t" \
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: "=r" (x) : "r" (__m(addr)), "i" (retval))
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extern int __get_user_bad(void);
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extern unsigned long __must_check ___copy_from_user(void *to,
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const void __user *from,
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unsigned long size);
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extern unsigned long copy_from_user_fixup(void *to, const void __user *from,
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unsigned long size);
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static inline unsigned long __must_check
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copy_from_user(void *to, const void __user *from, unsigned long size)
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{
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unsigned long ret = ___copy_from_user(to, from, size);
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if (unlikely(ret))
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ret = copy_from_user_fixup(to, from, size);
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return ret;
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}
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#define __copy_from_user copy_from_user
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extern unsigned long __must_check ___copy_to_user(void __user *to,
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const void *from,
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unsigned long size);
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extern unsigned long copy_to_user_fixup(void __user *to, const void *from,
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unsigned long size);
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static inline unsigned long __must_check
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copy_to_user(void __user *to, const void *from, unsigned long size)
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{
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unsigned long ret = ___copy_to_user(to, from, size);
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if (unlikely(ret))
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ret = copy_to_user_fixup(to, from, size);
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return ret;
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}
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#define __copy_to_user copy_to_user
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extern unsigned long __must_check ___copy_in_user(void __user *to,
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const void __user *from,
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unsigned long size);
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extern unsigned long copy_in_user_fixup(void __user *to, void __user *from,
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unsigned long size);
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static inline unsigned long __must_check
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copy_in_user(void __user *to, void __user *from, unsigned long size)
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{
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unsigned long ret = ___copy_in_user(to, from, size);
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if (unlikely(ret))
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ret = copy_in_user_fixup(to, from, size);
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return ret;
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}
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#define __copy_in_user copy_in_user
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extern unsigned long __must_check __clear_user(void __user *, unsigned long);
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#define clear_user __clear_user
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extern long __must_check __strncpy_from_user(char *dest, const char __user *src, long count);
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#define strncpy_from_user __strncpy_from_user
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extern long __strlen_user(const char __user *);
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extern long __strnlen_user(const char __user *, long len);
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#define strlen_user __strlen_user
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#define strnlen_user __strnlen_user
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#define __copy_to_user_inatomic ___copy_to_user
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#define __copy_from_user_inatomic ___copy_from_user
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_UACCESS_H */
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