Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
---
powerpc/Makefile.common | 1 +
powerpc/atomics.c | 190 ++++++++++++++++++++++++++++++++++++++++
powerpc/unittests.cfg | 9 ++
3 files changed, 200 insertions(+)
create mode 100644 powerpc/atomics.c
diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common
index caa807f2..697f5735 100644
--- a/powerpc/Makefile.common
+++ b/powerpc/Makefile.common
@@ -10,6 +10,7 @@ tests-common = \
$(TEST_DIR)/spapr_hcall.elf \
$(TEST_DIR)/rtas.elf \
$(TEST_DIR)/emulator.elf \
+ $(TEST_DIR)/atomics.elf \
$(TEST_DIR)/tm.elf \
$(TEST_DIR)/smp.elf \
$(TEST_DIR)/sprs.elf \
diff --git a/powerpc/atomics.c b/powerpc/atomics.c
new file mode 100644
index 00000000..f2e7a3e3
--- /dev/null
+++ b/powerpc/atomics.c
@@ -0,0 +1,190 @@
+/*
+ * Test some powerpc instructions
+ */
+#include <stdint.h>
+#include <libcflat.h>
+#include <migrate.h>
+#include <asm/processor.h>
+
+static int verbose;
+
+#define RSV_SIZE 128
+
+static uint8_t granule[RSV_SIZE] __attribute((__aligned__(RSV_SIZE)));
+
+static void test_lwarx_stwcx(void)
+{
+ unsigned int *var = (unsigned int *)granule;
+ unsigned int old;
+ unsigned int result;
+
+ report_prefix_push("lwarx/stwcx.");
+
+ *var = 0;
+ asm volatile ("1:"
+ "lwarx %0,0,%2;"
+ "stwcx. %1,0,%2;"
+ "bne- 1b;"
+ : "=&r"(old) : "r"(1), "r"(var) : "cr0", "memory");
+ report(old == 0 && *var == 1, "simple update");
+
+ *var = 0;
+ asm volatile ("li %0,0;"
+ "stwcx. %1,0,%2;"
+ "stwcx. %1,0,%2;"
+ "bne- 1f;"
+ "li %0,1;"
+ "1:"
+ : "=&r"(result)
+ : "r"(1), "r"(var) : "cr0", "memory");
+ report(result == 0 && *var == 0, "failed stwcx. (no reservation)");
+
+ *var = 0;
+ asm volatile ("li %0,0;"
+ "lwarx %1,0,%4;"
+ "stw %3,0(%4);"
+ "stwcx. %2,0,%4;"
+ "bne- 1f;"
+ "li %0,1;"
+ "1:"
+ : "=&r"(result), "=&r"(old)
+ : "r"(1), "r"(2), "r"(var) : "cr0", "memory");
+ report(result == 0 && *var == 2, "failed stwcx. (intervening store)");
+
+ report_prefix_pop();
+}
+
+static void test_lqarx_stqcx(void)
+{
+ union {
+ __int128_t var;
+ struct {
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+ unsigned long var1;
+ unsigned long var2;
+#else
+ unsigned long var2;
+ unsigned long var1;
+#endif
+ };
+ } var __attribute__((aligned(16)));
+ register unsigned long new1 asm("r8");
+ register unsigned long new2 asm("r9");
+ register unsigned long old1 asm("r10");
+ register unsigned long old2 asm("r11");
+ unsigned int result;
+
+ var.var1 = 1;
+ var.var2 = 2;
+
+ (void)new2;
+ (void)old2;
+
+ report_prefix_push("lqarx/stqcx.");
+
+ old1 = 0;
+ old2 = 0;
+ new1 = 3;
+ new2 = 4;
+ asm volatile ("1:"
+ "lqarx %0,0,%4;"
+ "stqcx. %2,0,%4;"
+ "bne- 1b;"
+ : "=&r"(old1), "=&r"(old2)
+ : "r"(new1), "r"(new2), "r"(&var)
+ : "cr0", "memory");
+
+ report(old1 == 2 && old2 == 1 && var.var1 == 4 && var.var2 == 3,
+ "simple update");
+
+ var.var1 = 1;
+ var.var2 = 2;
+ new1 = 3;
+ new2 = 4;
+ asm volatile ("li %0,0;"
+ "stqcx. %1,0,%3;"
+ "stqcx. %1,0,%3;"
+ "bne- 1f;"
+ "li %0,1;"
+ "1:"
+ : "=&r"(result)
+ : "r"(new1), "r"(new2), "r"(&var)
+ : "cr0", "memory");
+ report(result == 0 && var.var1 == 1 && var.var2 == 2,
+ "failed stqcx. (no reservation)");
+
+ var.var1 = 1;
+ var.var2 = 2;
+ new1 = 3;
+ new2 = 4;
+ asm volatile ("li %0,0;"
+ "lqarx %1,0,%6;"
+ "std %5,0(%6);"
+ "stqcx. %3,0,%6;"
+ "bne- 1f;"
+ "li %0,1;"
+ "1:"
+ : "=&r"(result), "=&r"(old1), "=&r"(old2)
+ : "r"(new1), "r"(new2), "r"(0), "r"(&var)
+ : "cr0", "memory");
+ report(result == 0 && (var.var1 == 0 || var.var2 == 0),
+ "failed stqcx. (intervening store)");
+
+ report_prefix_pop();
+}
+
+static void test_migrate_reserve(void)
+{
+ unsigned int *var = (unsigned int *)granule;
+ unsigned int old;
+
+ /* ensure incorrect value does not succeed */
+ report_prefix_push("migrate reservation");
+
+ *var = 0x12345;
+ asm volatile ("lwarx %0,0,%1" : "=&r"(old) : "r"(var) : "memory");
+ migrate();
+ *var = 0;
+ asm volatile ("stwcx. %0,0,%1" : : "r"(0xbad), "r"(var) : "cr0", "memory");
+ report(*var == 0, "migrate reserve update fails with concurrently modified value");
+
+#if 0
+XXX this will not work with KVM and for QEMU it only works with record/replay -
+something the harness is not equipped to test.
+
+ /* ensure reservation succeds */
+ report_prefix_push("migrate reservation");
+
+ *var = 0x12345;
+ asm volatile ("lwarx %0,0,%1" : "=&r"(old) : "r"(var) : "memory");
+ migrate();
+ asm volatile ("stwcx. %0,0,%1" : : "r"(0xf070), "r"(var) : "cr0", "memory");
+ report(*var == 0xf070, "migrate reserve update succeeds with unmodified value");
+#endif
+}
+
+int main(int argc, char **argv)
+{
+ int i;
+ bool migrate = false;
+
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "-v") == 0) {
+ verbose = 1;
+ }
+ if (strcmp(argv[i], "-m") == 0) {
+ migrate = true;
+ }
+ }
+
+ report_prefix_push("atomics");
+
+ test_lwarx_stwcx();
+ test_lqarx_stqcx();
+ if (migrate)
+ test_migrate_reserve();
+
+ report_prefix_pop();
+
+ return report_summary();
+}
diff --git a/powerpc/unittests.cfg b/powerpc/unittests.cfg
index 727712bb..9f71ea93 100644
--- a/powerpc/unittests.cfg
+++ b/powerpc/unittests.cfg
@@ -80,6 +80,15 @@ smp = 2
file = smp.elf
smp = 8,threads=4
+[atomics]
+file = atomics.elf
+
+[atomics-migration]
+file = atomics.elf
+machine = pseries
+extra_params = -append '-m'
+groups = migration
+
[h_cede_tm]
file = tm.elf
machine = pseries
--
2.42.0
