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s390x/tcg: Utilities for vector instruction helpers 

We'll have to read/write vector elements quite frequently from helpers.
The tricky bit is properly taking care of endianess. Handle it similar
to aarch64.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190307121539.12842-4-david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
master
David Hildenbrand 2019-03-07 13:15:10 +01:00 committed by Cornelia Huck
parent b971a2fda3
commit 5b5d2090de
1 changed files with 101 additions and 0 deletions
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target/s390x/vec.h Normal file
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/*
* QEMU TCG support -- s390x vector utilitites
*
* Copyright (C) 2019 Red Hat Inc
*
* Authors:
* David Hildenbrand <david@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef S390X_VEC_H
#define S390X_VEC_H
typedef union S390Vector {
uint64_t doubleword[2];
uint32_t word[4];
uint16_t halfword[8];
uint8_t byte[16];
} S390Vector;
/*
* Each vector is stored as two 64bit host values. So when talking about
* byte/halfword/word numbers, we have to take care of proper translation
* between element numbers.
*
* Big Endian (target/possible host)
* B: [ 0][ 1][ 2][ 3][ 4][ 5][ 6][ 7] - [ 8][ 9][10][11][12][13][14][15]
* HW: [ 0][ 1][ 2][ 3] - [ 4][ 5][ 6][ 7]
* W: [ 0][ 1] - [ 2][ 3]
* DW: [ 0] - [ 1]
*
* Little Endian (possible host)
* B: [ 7][ 6][ 5][ 4][ 3][ 2][ 1][ 0] - [15][14][13][12][11][10][ 9][ 8]
* HW: [ 3][ 2][ 1][ 0] - [ 7][ 6][ 5][ 4]
* W: [ 1][ 0] - [ 3][ 2]
* DW: [ 0] - [ 1]
*/
#ifndef HOST_WORDS_BIGENDIAN
#define H1(x) ((x) ^ 7)
#define H2(x) ((x) ^ 3)
#define H4(x) ((x) ^ 1)
#else
#define H1(x) (x)
#define H2(x) (x)
#define H4(x) (x)
#endif
static inline uint8_t s390_vec_read_element8(const S390Vector *v, uint8_t enr)
{
g_assert(enr < 16);
return v->byte[H1(enr)];
}
static inline uint16_t s390_vec_read_element16(const S390Vector *v, uint8_t enr)
{
g_assert(enr < 8);
return v->halfword[H2(enr)];
}
static inline uint32_t s390_vec_read_element32(const S390Vector *v, uint8_t enr)
{
g_assert(enr < 4);
return v->word[H4(enr)];
}
static inline uint64_t s390_vec_read_element64(const S390Vector *v, uint8_t enr)
{
g_assert(enr < 2);
return v->doubleword[enr];
}
static inline void s390_vec_write_element8(S390Vector *v, uint8_t enr,
uint8_t data)
{
g_assert(enr < 16);
v->byte[H1(enr)] = data;
}
static inline void s390_vec_write_element16(S390Vector *v, uint8_t enr,
uint16_t data)
{
g_assert(enr < 8);
v->halfword[H2(enr)] = data;
}
static inline void s390_vec_write_element32(S390Vector *v, uint8_t enr,
uint32_t data)
{
g_assert(enr < 4);
v->word[H4(enr)] = data;
}
static inline void s390_vec_write_element64(S390Vector *v, uint8_t enr,
uint64_t data)
{
g_assert(enr < 2);
v->doubleword[enr] = data;
}
#endif /* S390X_VEC_H */