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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fsel.c (786B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/types.h>
      3#include <linux/errno.h>
      4#include <linux/uaccess.h>
      5
      6#include <asm/sfp-machine.h>
      7#include <math-emu/soft-fp.h>
      8#include <math-emu/double.h>
      9
     10int
     11fsel(u32 *frD, void *frA, u32 *frB, u32 *frC)
     12{
     13	FP_DECL_D(A);
     14	FP_DECL_EX;
     15
     16#ifdef DEBUG
     17	printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
     18#endif
     19
     20	FP_UNPACK_DP(A, frA);
     21
     22#ifdef DEBUG
     23	printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
     24	printk("B: %08x %08x\n", frB[0], frB[1]);
     25	printk("C: %08x %08x\n", frC[0], frC[1]);
     26#endif
     27
     28	if (A_c == FP_CLS_NAN || (A_c != FP_CLS_ZERO && A_s)) {
     29		frD[0] = frB[0];
     30		frD[1] = frB[1];
     31	} else {
     32		frD[0] = frC[0];
     33		frD[1] = frC[1];
     34	}
     35
     36#ifdef DEBUG
     37	printk("D: %08x.%08x\n", frD[0], frD[1]);
     38#endif
     39
     40	return 0;
     41}