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tcg: Improve the alignment check infrastructure

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Some architectures (e.g. ARMv8) need the address which is aligned
to a size more than the size of the memory access.
To support such check it's enough the current costless alignment
check implementation in QEMU, but we need to support
an alignment size specifying.

Signed-off-by: Sergey Sorokin <afarallax@yandex.ru>
Message-Id: <1466705806-679898-1-git-send-email-afarallax@yandex.ru>
Signed-off-by: Richard Henderson <rth@twiddle.net>
[rth: Assert in tcg_canonicalize_memop.  Leave get_alignment_bits
available for, though unused by, user-mode.  Retain logging difference
based on ALIGNED_ONLY.]
This commit is contained in:
Sergey Sorokin 2016-06-23 21:16:46 +03:00 • committed by Richard Henderson
parent 59d7c14eef
commit 1f00b27f17
9 changed files with 159 additions and 108 deletions
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14
tcg/ppc/tcg-target.inc.c
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@ -1405,6 +1405,7 @@ static TCGReg tcg_out_tlb_read(TCGContext *s, TCGMemOp opc,
int add_off = offsetof(CPUArchState, tlb_table[mem_index][0].addend);
TCGReg base = TCG_AREG0;
TCGMemOp s_bits = opc & MO_SIZE;
int a_bits = get_alignment_bits(opc);
/* Extract the page index, shifted into place for tlb index. */
if (TCG_TARGET_REG_BITS == 64) {
@ -1462,14 +1463,17 @@ static TCGReg tcg_out_tlb_read(TCGContext *s, TCGMemOp opc,
* the bottom bits and thus trigger a comparison failure on
* unaligned accesses
*/
if (a_bits < 0) {
a_bits = s_bits;
}
tcg_out_rlw(s, RLWINM, TCG_REG_R0, addrlo, 0,
(32 - s_bits) & 31, 31 - TARGET_PAGE_BITS);
} else if (s_bits) {
/* > byte access, we need to handle alignment */
if ((opc & MO_AMASK) == MO_ALIGN) {
(32 - a_bits) & 31, 31 - TARGET_PAGE_BITS);
} else if (a_bits) {
/* More than byte access, we need to handle alignment */
if (a_bits > 0) {
/* Alignment required by the front-end, same as 32-bits */
tcg_out_rld(s, RLDICL, TCG_REG_R0, addrlo,
64 - TARGET_PAGE_BITS, TARGET_PAGE_BITS - s_bits);
64 - TARGET_PAGE_BITS, TARGET_PAGE_BITS - a_bits);
tcg_out_rld(s, RLDICL, TCG_REG_R0, TCG_REG_R0, TARGET_PAGE_BITS, 0);
} else {
/* We support unaligned accesses, we need to make sure we fail