Add a sys_clone3 wrapper (based on the INLINE_CLONE_SYSCALL macro
in glibc) for SPARC to handle its unique return call convention.
The needed handling is described in arch/sparc/kernel/process_{32|64}.c:
Parent --> %o0 == child's pid, %o1 == 0
Child --> %o0 == parent's pid, %o1 == 1
Signed-off-by: Ludwig Rydberg <[email protected]>
---
.../selftests/clone3/clone3_selftests.h | 75 +++++++++++++++++++
1 file changed, 75 insertions(+)
diff --git a/tools/testing/selftests/clone3/clone3_selftests.h
b/tools/testing/selftests/clone3/clone3_selftests.h
index a0593e8950f0..5fa33294227d 100644
--- a/tools/testing/selftests/clone3/clone3_selftests.h
+++ b/tools/testing/selftests/clone3/clone3_selftests.h
@@ -33,12 +33,87 @@ struct __clone_args {
__aligned_u64 cgroup;
};
+#if defined(__sparc__)
+#include <errno.h>
+
+#if defined(__arch64__)
+#define __SYSCALL_STRING \
+ "mov %[scn], %%g1;" \
+ "ta 0x6d;" \
+ "bcc,pt %%xcc, 1f;" \
+ " nop;" \
+ "sub %%g0, %%o0, %%o0;" \
+ "1:"
+
+#define __SYSCALL_CLOBBERS \
+ "g1", "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
+ "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
+ "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
+ "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
+ "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46", \
+ "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62", \
+ "cc", "memory"
+#else
+#define __SYSCALL_STRING \
+ "mov %[scn], %%g1;" \
+ "ta 0x10;" \
+ "bcc 1f;" \
+ " nop;" \
+ "sub %%g0, %%o0, %%o0;" \
+ "1:"
+
+#define __SYSCALL_CLOBBERS \
+ "g1", "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
+ "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
+ "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
+ "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
+ "cc", "memory"
+#endif
+
+/* A special wrapper is required to handle the return call convention
+ * on SPARC and is based on the INLINE_CLONE_SYSCALL macro in glibc.
+ *
+ * Parent --> %o0 == child's pid, %o1 == 0
+ * Child --> %o0 == parent's pid, %o1 == 1
+ */
+static inline pid_t sparc_clone3(struct __clone_args *args, size_t size)
+{
+ long _cl_args = (long) (args);
+ long _size = (long) (size);
+ long _scn = __NR_clone3;
+
+ register long o0 __asm__ ("o0") = _cl_args;
+ register long o1 __asm__ ("o1") = _size;
+
+ asm volatile (__SYSCALL_STRING
+ : "=r" (o0), "=r" (o1)
+ : [scn] "r" (_scn), "0" (o0), "1" (o1)
+ : __SYSCALL_CLOBBERS);
+
+ if ((unsigned long) (o0) > -4096UL) {
+ errno = -o0;
+ o0 = -1L;
+ } else {
+ o0 &= (o1 - 1);
+ }
+
+ return o0;
+}
+
+static pid_t sys_clone3(struct __clone_args *args, size_t size)
+{
+ fflush(stdout);
+ fflush(stderr);
+ return sparc_clone3(args, size);
+}
+#else
static pid_t sys_clone3(struct __clone_args *args, size_t size)
{
fflush(stdout);
fflush(stderr);
return syscall(__NR_clone3, args, size);
}
+#endif
static inline void test_clone3_supported(void)
{
--
2.35.3
