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From 6149b73d6ebd878d1b3ca8f0a044acd306ab1367 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Alex=20Benn=C3=A9e?= <alex.bennee@linaro.org>
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Date: Mon, 23 Dec 2013 23:27:28 +0000
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Subject: [PATCH 052/158] target-arm: A64: add support for ld/st unsigned imm
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This adds support for the forms of ld/st with a 12 bit
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unsigned immediate offset.
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Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Richard Henderson <rth@twiddle.net>
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target-arm/translate-a64.c | 89 +++++++++++++++++++++++++++++++++++++++++++++-
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1 file changed, 88 insertions(+), 1 deletion(-)
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diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
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index 0c3b994..0edcee1 100644
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--- a/target-arm/translate-a64.c
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+++ b/target-arm/translate-a64.c
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@@ -901,10 +901,97 @@ static void disas_ldst_pair(DisasContext *s, uint32_t insn)
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+ * C3.3.13 Load/store (unsigned immediate)
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+ * 31 30 29 27 26 25 24 23 22 21 10 9 5
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+ * +----+-------+---+-----+-----+------------+-------+------+
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+ * |size| 1 1 1 | V | 0 1 | opc | imm12 | Rn | Rt |
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+ * +----+-------+---+-----+-----+------------+-------+------+
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+ * size: 00-> byte, 01 -> 16 bit, 10 -> 32bit, 11 -> 64bit
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+ * opc: 00 -> store, 01 -> loadu, 10 -> loads 64, 11 -> loads 32
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+ * size is opc<1>:size<1:0> so 100 -> 128 bit; 110 and 111 unallocated
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+ * opc<0>: 0 -> store, 1 -> load
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+ * Rn: base address register (inc SP)
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+ * Rt: target register
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+static void disas_ldst_reg_unsigned_imm(DisasContext *s, uint32_t insn)
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+ int rt = extract32(insn, 0, 5);
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+ int rn = extract32(insn, 5, 5);
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+ unsigned int imm12 = extract32(insn, 10, 12);
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+ bool is_vector = extract32(insn, 26, 1);
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+ int size = extract32(insn, 30, 2);
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+ int opc = extract32(insn, 22, 2);
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+ unsigned int offset;
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+ bool is_signed = false;
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+ bool is_extended = false;
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+ size |= (opc & 2) << 1;
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+ unallocated_encoding(s);
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+ is_store = !extract32(opc, 0, 1);
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+ if (size == 3 && opc == 2) {
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+ /* PRFM - prefetch */
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+ if (opc == 3 && size > 1) {
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+ unallocated_encoding(s);
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+ is_store = (opc == 0);
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+ is_signed = extract32(opc, 1, 1);
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+ is_extended = (size < 3) && extract32(opc, 0, 1);
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+ gen_check_sp_alignment(s);
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+ tcg_addr = read_cpu_reg_sp(s, rn, 1);
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+ offset = imm12 << size;
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+ tcg_gen_addi_i64(tcg_addr, tcg_addr, offset);
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+ do_fp_st(s, rt, tcg_addr, size);
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+ do_fp_ld(s, rt, tcg_addr, size);
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+ TCGv_i64 tcg_rt = cpu_reg(s, rt);
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+ do_gpr_st(s, tcg_rt, tcg_addr, size);
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+ do_gpr_ld(s, tcg_rt, tcg_addr, size, is_signed, is_extended);
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/* Load/store register (all forms) */
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static void disas_ldst_reg(DisasContext *s, uint32_t insn)
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- unsupported_encoding(s, insn);
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+ switch (extract32(insn, 24, 2)) {
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+ unsupported_encoding(s, insn);
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+ disas_ldst_reg_unsigned_imm(s, insn);
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+ unallocated_encoding(s);
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/* AdvSIMD load/store multiple structures */