target-arm: Avoid buffer overrun on UNPREDICTABLE ldrd/strd

A LDRD or STRD where rd is not an even number is UNPREDICTABLE.
We were letting this fall through, which is OK unless rd is 15,
in which case we would attempt to do a load_reg or store_reg
to a nonexistent r16 for the second half of the double-word.
Catch the odd-numbered-rd cases and UNDEF them instead.

To do this we rearrange the structure of the code a little
so we can put the UNDEF catches at the top before we've
allocated TCG temporaries.

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1431348973-21315-1-git-send-email-peter.maydell@linaro.org
(cherry picked from commit 3960c336ad96c2183549c8bf32bbff93ecda7ea4)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/target-arm/translate.c b/target-arm/translate.c
index 9116529306643633752ca2965fed2d5b49339f40..f8f72bede32c62583a29e352da9d3b4055a176de 100644 (file)
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -8423,34 +8423,30 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
                 }
             } else {
                 int address_offset;
-                int load;
+                bool load = insn & (1 << 20);
+                bool doubleword = false;
                 /* Misc load/store */
                 rn = (insn >> 16) & 0xf;
                 rd = (insn >> 12) & 0xf;
+
+                if (!load && (sh & 2)) {
+                    /* doubleword */
+                    ARCH(5TE);
+                    if (rd & 1) {
+                        /* UNPREDICTABLE; we choose to UNDEF */
+                        goto illegal_op;
+                    }
+                    load = (sh & 1) == 0;
+                    doubleword = true;
+                }
+
                 addr = load_reg(s, rn);
                 if (insn & (1 << 24))
                     gen_add_datah_offset(s, insn, 0, addr);
                 address_offset = 0;
-                if (insn & (1 << 20)) {
-                    /* load */
-                    tmp = tcg_temp_new_i32();
-                    switch(sh) {
-                    case 1:
-                        gen_aa32_ld16u(tmp, addr, get_mem_index(s));
-                        break;
-                    case 2:
-                        gen_aa32_ld8s(tmp, addr, get_mem_index(s));
-                        break;
-                    default:
-                    case 3:
-                        gen_aa32_ld16s(tmp, addr, get_mem_index(s));
-                        break;
-                    }
-                    load = 1;
-                } else if (sh & 2) {
-                    ARCH(5TE);
-                    /* doubleword */
-                    if (sh & 1) {
+
+                if (doubleword) {
+                    if (!load) {
                         /* store */
                         tmp = load_reg(s, rd);
                         gen_aa32_st32(tmp, addr, get_mem_index(s));
@@ -8459,7 +8455,6 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
                         tmp = load_reg(s, rd + 1);
                         gen_aa32_st32(tmp, addr, get_mem_index(s));
                         tcg_temp_free_i32(tmp);
-                        load = 0;
                     } else {
                         /* load */
                         tmp = tcg_temp_new_i32();
@@ -8469,15 +8464,28 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
                         tmp = tcg_temp_new_i32();
                         gen_aa32_ld32u(tmp, addr, get_mem_index(s));
                         rd++;
-                        load = 1;
                     }
                     address_offset = -4;
+                } else if (load) {
+                    /* load */
+                    tmp = tcg_temp_new_i32();
+                    switch (sh) {
+                    case 1:
+                        gen_aa32_ld16u(tmp, addr, get_mem_index(s));
+                        break;
+                    case 2:
+                        gen_aa32_ld8s(tmp, addr, get_mem_index(s));
+                        break;
+                    default:
+                    case 3:
+                        gen_aa32_ld16s(tmp, addr, get_mem_index(s));
+                        break;
+                    }
                 } else {
                     /* store */
                     tmp = load_reg(s, rd);
                     gen_aa32_st16(tmp, addr, get_mem_index(s));
                     tcg_temp_free_i32(tmp);
-                    load = 0;
                 }
                 /* Perform base writeback before the loaded value to
                    ensure correct behavior with overlapping index registers.