On 17/03/2023 14.32, Nina Schoetterl-Glausch wrote:
The EXECUTE instruction executes the instruction at the given target
address. This address must be halfword aligned, otherwise a
specification exception occurs.
Add a test for this.
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Signed-off-by: Nina Schoetterl-Glausch <nsg@xxxxxxxxxxxxx>
---
s390x/spec_ex.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/s390x/spec_ex.c b/s390x/spec_ex.c
index ab023347..b4b9095f 100644
--- a/s390x/spec_ex.c
+++ b/s390x/spec_ex.c
@@ -177,6 +177,30 @@ static int short_psw_bit_12_is_0(void)
return 0;
}
+static int odd_ex_target(void)
+{
+ uint64_t pre_target_addr;
+ int to = 0, from = 0x0dd;
+
+ asm volatile ( ".pushsection .text.ex_odd\n"
+ " .balign 2\n"
+ "pre_odd_ex_target:\n"
+ " . = . + 1\n"
+ " lr %[to],%[from]\n"
+ " .popsection\n"
+
+ " larl %[pre_target_addr],pre_odd_ex_target\n"
+ " ex 0,1(%[pre_target_addr])\n"
+ : [pre_target_addr] "=&a" (pre_target_addr),
+ [to] "+d" (to)
+ : [from] "d" (from)
+ );
+
+ assert((pre_target_addr + 1) & 1);
+ report(to != from, "did not perform ex with odd target");
+ return 0;
+}
Hi Nina,
FWIW, this fails to compile with Clang v15 here:
s390x/spec_ex.c:187:4: error: symbol 'pre_odd_ex_target' is already defined
"pre_odd_ex_target:\n"
^
<inline asm>:3:1: note: instantiated into assembly here
pre_odd_ex_target:
No clue yet why that happens ... but compiling with Clang seems to be broken
on some other spots, too, so this is not really critical right now ;-)
Thomas
