For lswx in little-endian mode, an alignment interrupt occurs.
Signed-off-by: Laurent Vivier <lvivier@xxxxxxxxxx>
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
---
powerpc/emulator.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/powerpc/emulator.c b/powerpc/emulator.c
index 8d0dde2..87ef4a9 100644
--- a/powerpc/emulator.c
+++ b/powerpc/emulator.c
@@ -7,6 +7,7 @@
static int verbose;
static int volatile is_invalid;
+static int volatile alignment;
static void program_check_handler(struct pt_regs *regs, void *opaque)
{
@@ -30,6 +31,18 @@ static void program_check_handler(struct pt_regs *regs, void *opaque)
regs->nip += 4;
}
+static void alignment_handler(struct pt_regs *regs, void *opaque)
+{
+ int *data = opaque;
+
+ printf("Detected alignment exception 0x%016lx: %08x\n",
+ regs->nip, *(uint32_t*)regs->nip);
+
+ *data = 1;
+
+ regs->nip += 4;
+}
+
static void test_illegal(void)
{
report_prefix_push("invalid");
@@ -73,6 +86,8 @@ static void test_64bit(void)
* - RT <= RA or RB < RT + (n + 4) is invalid or result is undefined
* - RT == RA == 0 is invalid
*
+ * For lswx in little-endian mode, an alignment interrupt always occurs.
+ *
*/
static void test_lswx(void)
@@ -90,6 +105,7 @@ static void test_lswx(void)
/* check incomplete register filling */
+ alignment = 0;
asm volatile ("mtxer %[len];"
"li r12,-1;"
"mr r11, r12;"
@@ -103,7 +119,12 @@ static void test_lswx(void)
:
"xer", "r11", "r12", "memory");
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+ report("alignment", alignment);
+ return;
+#else
report("partial", regs[0] == 0x01020300 && regs[1] == (uint64_t)-1);
+#endif
/* check an old know bug: the number of bytes is used as
* the number of registers, so try 32 bytes.
@@ -200,6 +221,7 @@ int main(int argc, char **argv)
int i;
handle_exception(0x700, program_check_handler, (void *)&is_invalid);
+ handle_exception(0x600, alignment_handler, (void *)&alignment);
for (i = 0; i < argc; i++) {
if (strcmp(argv[i], "-v") == 0) {
--
2.5.0
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