cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cmpxchg-grb.h (2869B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __ASM_SH_CMPXCHG_GRB_H
      3#define __ASM_SH_CMPXCHG_GRB_H
      4
      5static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
      6{
      7	unsigned long retval;
      8
      9	__asm__ __volatile__ (
     10		"   .align 2              \n\t"
     11		"   mova    1f,   r0      \n\t" /* r0 = end point */
     12		"   nop                   \n\t"
     13		"   mov    r15,   r1      \n\t" /* r1 = saved sp */
     14		"   mov    #-4,   r15     \n\t" /* LOGIN */
     15		"   mov.l  @%1,   %0      \n\t" /* load  old value */
     16		"   mov.l   %2,   @%1     \n\t" /* store new value */
     17		"1: mov     r1,   r15     \n\t" /* LOGOUT */
     18		: "=&r" (retval),
     19		  "+r"  (m),
     20		  "+r"  (val)		/* inhibit r15 overloading */
     21		:
     22		: "memory", "r0", "r1");
     23
     24	return retval;
     25}
     26
     27static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val)
     28{
     29	unsigned long retval;
     30
     31	__asm__ __volatile__ (
     32		"   .align  2             \n\t"
     33		"   mova    1f,   r0      \n\t" /* r0 = end point */
     34		"   mov    r15,   r1      \n\t" /* r1 = saved sp */
     35		"   mov    #-6,   r15     \n\t" /* LOGIN */
     36		"   mov.w  @%1,   %0      \n\t" /* load  old value */
     37		"   extu.w  %0,   %0      \n\t" /* extend as unsigned */
     38		"   mov.w   %2,   @%1     \n\t" /* store new value */
     39		"1: mov     r1,   r15     \n\t" /* LOGOUT */
     40		: "=&r" (retval),
     41		  "+r"  (m),
     42		  "+r"  (val)		/* inhibit r15 overloading */
     43		:
     44		: "memory" , "r0", "r1");
     45
     46	return retval;
     47}
     48
     49static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
     50{
     51	unsigned long retval;
     52
     53	__asm__ __volatile__ (
     54		"   .align  2             \n\t"
     55		"   mova    1f,   r0      \n\t" /* r0 = end point */
     56		"   mov    r15,   r1      \n\t" /* r1 = saved sp */
     57		"   mov    #-6,   r15     \n\t" /* LOGIN */
     58		"   mov.b  @%1,   %0      \n\t" /* load  old value */
     59		"   extu.b  %0,   %0      \n\t" /* extend as unsigned */
     60		"   mov.b   %2,   @%1     \n\t" /* store new value */
     61		"1: mov     r1,   r15     \n\t" /* LOGOUT */
     62		: "=&r" (retval),
     63		  "+r"  (m),
     64		  "+r"  (val)		/* inhibit r15 overloading */
     65		:
     66		: "memory" , "r0", "r1");
     67
     68	return retval;
     69}
     70
     71static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
     72					  unsigned long new)
     73{
     74	unsigned long retval;
     75
     76	__asm__ __volatile__ (
     77		"   .align  2             \n\t"
     78		"   mova    1f,   r0      \n\t" /* r0 = end point */
     79		"   nop                   \n\t"
     80		"   mov    r15,   r1      \n\t" /* r1 = saved sp */
     81		"   mov    #-8,   r15     \n\t" /* LOGIN */
     82		"   mov.l  @%3,   %0      \n\t" /* load  old value */
     83		"   cmp/eq  %0,   %1      \n\t"
     84		"   bf            1f      \n\t" /* if not equal */
     85		"   mov.l   %2,   @%3     \n\t" /* store new value */
     86		"1: mov     r1,   r15     \n\t" /* LOGOUT */
     87		: "=&r" (retval),
     88		  "+r"  (old), "+r"  (new) /* old or new can be r15 */
     89		:  "r"  (m)
     90		: "memory" , "r0", "r1", "t");
     91
     92	return retval;
     93}
     94
     95#endif /* __ASM_SH_CMPXCHG_GRB_H */