diff options
Diffstat (limited to 'arch/powerpc/math-emu/lfs.c')
-rw-r--r-- | arch/powerpc/math-emu/lfs.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/powerpc/math-emu/lfs.c b/arch/powerpc/math-emu/lfs.c new file mode 100644 index 0000000000..7fd3d0854c --- /dev/null +++ b/arch/powerpc/math-emu/lfs.c @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/uaccess.h> + +#include <asm/sfp-machine.h> +#include <math-emu/soft-fp.h> +#include <math-emu/double.h> +#include <math-emu/single.h> + +int +lfs(void *frD, void *ea) +{ + FP_DECL_D(R); + FP_DECL_S(A); + FP_DECL_EX; + float f; + +#ifdef DEBUG + printk("%s: D %p, ea %p\n", __func__, frD, ea); +#endif + + if (copy_from_user(&f, ea, sizeof(float))) + return -EFAULT; + + FP_UNPACK_S(A, f); + +#ifdef DEBUG + printk("A: %ld %lu %ld (%ld) [%08lx]\n", A_s, A_f, A_e, A_c, + *(unsigned long *)&f); +#endif + + FP_CONV(D, S, 2, 1, R, A); + +#ifdef DEBUG + printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c); +#endif + + if (R_c == FP_CLS_NAN) { + R_e = _FP_EXPMAX_D; + _FP_PACK_RAW_2_P(D, frD, R); + } else { + __FP_PACK_D(frD, R); + } + + return 0; +} |