mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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631d8b674f
When compiling a MMU kernel with CPU_HAS_ADDRESS_SPACES=n (e.g. "MMU=y
allnoconfig": "echo CONFIG_MMU=y > allno.config && make KCONFIG_ALLCONFIG=1
allnoconfig"), we use plain "move" instead of "moves", and I got:
CC arch/m68k/lib/uaccess.o
{standard input}: Assembler messages:
{standard input}:47: Error: operands mismatch -- statement `move.b %a0,(%a1)' ignored
This happens because plain "move" doesn't support byte transfers between
memory and address registers, while "moves" does.
Fix the asm constraints for __generic_copy_from_user(),
__generic_copy_to_user(), and __clear_user() to only use data registers
when accessing userspace.
Also, relax the asm constraints for 16-bit userspace accesses in
__put_user() and __get_user(), as both "move" and "moves" do support
such transfers between memory and address registers.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
394 lines
10 KiB
C
394 lines
10 KiB
C
#ifndef __M68K_UACCESS_H
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#define __M68K_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <linux/compiler.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <asm/segment.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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/* We let the MMU do all checking */
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static inline int access_ok(int type, const void __user *addr,
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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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* Not all varients of the 68k family support the notion of address spaces.
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* The traditional 680x0 parts do, and they use the sfc/dfc registers and
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* the "moves" instruction to access user space from kernel space. Other
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* family members like ColdFire don't support this, and only have a single
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* address space, and use the usual "move" instruction for user space access.
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*
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* Outside of this difference the user space access functions are the same.
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* So lets keep the code simple and just define in what we need to use.
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*/
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#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
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#define MOVES "moves"
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#else
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#define MOVES "move"
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#endif
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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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{
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unsigned long insn, fixup;
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};
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extern int __put_user_bad(void);
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extern int __get_user_bad(void);
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#define __put_user_asm(res, x, ptr, bwl, reg, err) \
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asm volatile ("\n" \
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"1: "MOVES"."#bwl" %2,%1\n" \
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"2:\n" \
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" .section .fixup,\"ax\"\n" \
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" .even\n" \
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"10: moveq.l %3,%0\n" \
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" jra 2b\n" \
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" .previous\n" \
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"\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 4\n" \
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" .long 1b,10b\n" \
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" .long 2b,10b\n" \
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" .previous" \
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: "+d" (res), "=m" (*(ptr)) \
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: #reg (x), "i" (err))
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/*
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* These are the main single-value transfer routines. They automatically
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* use the right size if we just have the right pointer type.
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*/
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#define __put_user(x, ptr) \
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({ \
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typeof(*(ptr)) __pu_val = (x); \
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int __pu_err = 0; \
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__chk_user_ptr(ptr); \
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switch (sizeof (*(ptr))) { \
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case 1: \
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__put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \
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break; \
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case 2: \
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__put_user_asm(__pu_err, __pu_val, ptr, w, r, -EFAULT); \
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break; \
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case 4: \
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__put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \
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break; \
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case 8: \
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{ \
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const void __user *__pu_ptr = (ptr); \
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asm volatile ("\n" \
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"1: "MOVES".l %2,(%1)+\n" \
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"2: "MOVES".l %R2,(%1)\n" \
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"3:\n" \
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" .section .fixup,\"ax\"\n" \
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" .even\n" \
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"10: movel %3,%0\n" \
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" jra 3b\n" \
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" .previous\n" \
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"\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 4\n" \
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" .long 1b,10b\n" \
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" .long 2b,10b\n" \
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" .long 3b,10b\n" \
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" .previous" \
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: "+d" (__pu_err), "+a" (__pu_ptr) \
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: "r" (__pu_val), "i" (-EFAULT) \
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: "memory"); \
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break; \
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} \
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default: \
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__pu_err = __put_user_bad(); \
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break; \
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} \
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__pu_err; \
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})
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#define put_user(x, ptr) __put_user(x, ptr)
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#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \
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type __gu_val; \
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asm volatile ("\n" \
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"1: "MOVES"."#bwl" %2,%1\n" \
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"2:\n" \
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" .section .fixup,\"ax\"\n" \
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" .even\n" \
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"10: move.l %3,%0\n" \
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" sub.l %1,%1\n" \
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" jra 2b\n" \
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" .previous\n" \
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"\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 4\n" \
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" .long 1b,10b\n" \
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" .previous" \
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: "+d" (res), "=&" #reg (__gu_val) \
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: "m" (*(ptr)), "i" (err)); \
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(x) = (typeof(*(ptr)))(unsigned long)__gu_val; \
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})
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#define __get_user(x, ptr) \
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({ \
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int __gu_err = 0; \
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__chk_user_ptr(ptr); \
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switch (sizeof(*(ptr))) { \
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case 1: \
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__get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \
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break; \
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case 2: \
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__get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT); \
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break; \
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case 4: \
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__get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \
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break; \
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/* case 8: disabled because gcc-4.1 has a broken typeof \
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{ \
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const void *__gu_ptr = (ptr); \
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u64 __gu_val; \
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asm volatile ("\n" \
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"1: "MOVES".l (%2)+,%1\n" \
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"2: "MOVES".l (%2),%R1\n" \
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"3:\n" \
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" .section .fixup,\"ax\"\n" \
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" .even\n" \
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"10: move.l %3,%0\n" \
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" sub.l %1,%1\n" \
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" sub.l %R1,%R1\n" \
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" jra 3b\n" \
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" .previous\n" \
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"\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 4\n" \
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" .long 1b,10b\n" \
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" .long 2b,10b\n" \
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" .previous" \
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: "+d" (__gu_err), "=&r" (__gu_val), \
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"+a" (__gu_ptr) \
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: "i" (-EFAULT) \
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: "memory"); \
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(x) = (typeof(*(ptr)))__gu_val; \
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break; \
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} */ \
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default: \
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__gu_err = __get_user_bad(); \
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break; \
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} \
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__gu_err; \
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})
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#define get_user(x, ptr) __get_user(x, ptr)
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unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n);
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unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n);
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#define __constant_copy_from_user_asm(res, to, from, tmp, n, s1, s2, s3)\
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asm volatile ("\n" \
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"1: "MOVES"."#s1" (%2)+,%3\n" \
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" move."#s1" %3,(%1)+\n" \
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"2: "MOVES"."#s2" (%2)+,%3\n" \
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" move."#s2" %3,(%1)+\n" \
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" .ifnc \""#s3"\",\"\"\n" \
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"3: "MOVES"."#s3" (%2)+,%3\n" \
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" move."#s3" %3,(%1)+\n" \
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" .endif\n" \
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"4:\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 4\n" \
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" .long 1b,10f\n" \
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" .long 2b,20f\n" \
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" .ifnc \""#s3"\",\"\"\n" \
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" .long 3b,30f\n" \
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" .endif\n" \
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" .previous\n" \
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"\n" \
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" .section .fixup,\"ax\"\n" \
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" .even\n" \
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"10: clr."#s1" (%1)+\n" \
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"20: clr."#s2" (%1)+\n" \
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" .ifnc \""#s3"\",\"\"\n" \
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"30: clr."#s3" (%1)+\n" \
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" .endif\n" \
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" moveq.l #"#n",%0\n" \
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" jra 4b\n" \
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" .previous\n" \
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: "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp) \
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: : "memory")
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static __always_inline unsigned long
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__constant_copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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unsigned long res = 0, tmp;
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switch (n) {
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case 1:
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__get_user_asm(res, *(u8 *)to, (u8 __user *)from, u8, b, d, 1);
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break;
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case 2:
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__get_user_asm(res, *(u16 *)to, (u16 __user *)from, u16, w, r, 2);
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break;
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case 3:
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__constant_copy_from_user_asm(res, to, from, tmp, 3, w, b,);
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break;
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case 4:
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__get_user_asm(res, *(u32 *)to, (u32 __user *)from, u32, l, r, 4);
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break;
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case 5:
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__constant_copy_from_user_asm(res, to, from, tmp, 5, l, b,);
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break;
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case 6:
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__constant_copy_from_user_asm(res, to, from, tmp, 6, l, w,);
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break;
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case 7:
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__constant_copy_from_user_asm(res, to, from, tmp, 7, l, w, b);
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break;
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case 8:
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__constant_copy_from_user_asm(res, to, from, tmp, 8, l, l,);
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break;
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case 9:
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__constant_copy_from_user_asm(res, to, from, tmp, 9, l, l, b);
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break;
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case 10:
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__constant_copy_from_user_asm(res, to, from, tmp, 10, l, l, w);
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break;
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case 12:
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__constant_copy_from_user_asm(res, to, from, tmp, 12, l, l, l);
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break;
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default:
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/* we limit the inlined version to 3 moves */
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return __generic_copy_from_user(to, from, n);
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}
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return res;
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}
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#define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3) \
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asm volatile ("\n" \
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" move."#s1" (%2)+,%3\n" \
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"11: "MOVES"."#s1" %3,(%1)+\n" \
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"12: move."#s2" (%2)+,%3\n" \
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"21: "MOVES"."#s2" %3,(%1)+\n" \
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"22:\n" \
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" .ifnc \""#s3"\",\"\"\n" \
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" move."#s3" (%2)+,%3\n" \
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"31: "MOVES"."#s3" %3,(%1)+\n" \
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"32:\n" \
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" .endif\n" \
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"4:\n" \
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"\n" \
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" .section __ex_table,\"a\"\n" \
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" .align 4\n" \
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" .long 11b,5f\n" \
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" .long 12b,5f\n" \
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" .long 21b,5f\n" \
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" .long 22b,5f\n" \
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" .ifnc \""#s3"\",\"\"\n" \
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" .long 31b,5f\n" \
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" .long 32b,5f\n" \
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" .endif\n" \
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" .previous\n" \
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"\n" \
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" .section .fixup,\"ax\"\n" \
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" .even\n" \
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"5: moveq.l #"#n",%0\n" \
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" jra 4b\n" \
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" .previous\n" \
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: "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp) \
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: : "memory")
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static __always_inline unsigned long
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__constant_copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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unsigned long res = 0, tmp;
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switch (n) {
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case 1:
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__put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1);
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break;
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case 2:
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__put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, r, 2);
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break;
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case 3:
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__constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,);
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break;
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case 4:
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__put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4);
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break;
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case 5:
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__constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,);
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break;
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case 6:
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__constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,);
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break;
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case 7:
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__constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b);
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break;
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case 8:
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__constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,);
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break;
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case 9:
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__constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b);
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break;
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case 10:
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__constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w);
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break;
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case 12:
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__constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l);
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break;
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default:
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/* limit the inlined version to 3 moves */
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return __generic_copy_to_user(to, from, n);
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}
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return res;
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}
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#define __copy_from_user(to, from, n) \
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(__builtin_constant_p(n) ? \
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__constant_copy_from_user(to, from, n) : \
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__generic_copy_from_user(to, from, n))
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#define __copy_to_user(to, from, n) \
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(__builtin_constant_p(n) ? \
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__constant_copy_to_user(to, from, n) : \
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__generic_copy_to_user(to, from, n))
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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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#define copy_from_user(to, from, n) __copy_from_user(to, from, n)
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#define copy_to_user(to, from, n) __copy_to_user(to, from, n)
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#define user_addr_max() \
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(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
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extern long strncpy_from_user(char *dst, const char __user *src, long count);
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extern __must_check long strlen_user(const char __user *str);
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extern __must_check long strnlen_user(const char __user *str, long n);
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unsigned long __clear_user(void __user *to, unsigned long n);
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#define clear_user __clear_user
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#endif /* _M68K_UACCESS_H */
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