LTP tests the raw (non libc) sigaction ABI to kernel such as validation
of various params.
sigaction on ARC relies on default userspace sa restorer to invoke a
sigreturn syscall when returning from a signal handler. Thus libc provides
a default sa restorer.
LTP tests the raw sigaction syscall ABI (w/o libc) hence needs the
restorer userspace infrastructure, which this patch provides for ARC.
Signed-off-by: Vineet Gupta <vgupta at synopsys.com>
---
include/lapi/rt_sigaction.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/include/lapi/rt_sigaction.h b/include/lapi/rt_sigaction.h
index 3a5a763ce094..c7fb04fc25be 100644
--- a/include/lapi/rt_sigaction.h
+++ b/include/lapi/rt_sigaction.h
@@ -145,6 +145,30 @@ static void __attribute__((used)) __sigreturn_stub(void)
# endif
#endif /* __sparc__ */
+#ifdef __arc__
+
+#undef SA_RESTORER
+#define SA_RESTORER 0x04000000
+
+/*
+ * based on uClibc/libc/sysdeps/linux/arc/sigaction.c
+ */
+static void
+__attribute__ ((optimize("Os"))) __attribute__((used)) restore_rt(void)
+{
+ __asm__ (
+ "mov r8, %0 \n\t"
+#ifdef __ARCHS__
+ "trap_s 0 \n\t"
+#else
+ "trap0 \n\t"
+#endif
+ : /* no outputs */
+ : "i" (__NR_rt_sigreturn)
+ : "r8");
+}
+#endif
+
/* This is a wrapper for __NR_rt_sigaction syscall.
* act/oact values of INVAL_SA_PTR is used to pass
* an invalid pointer to syscall(__NR_rt_sigaction)
@@ -176,8 +200,10 @@ static int ltp_rt_sigaction(int signum, const struct sigaction *act,
else if (oact)
koact_p = &koact;
+#if defined __x86_64__ || defined __arc__
#ifdef __x86_64__
sig_initial(signum);
+#endif
kact.sa_flags |= SA_RESTORER;
kact.sa_restorer = restore_rt;
#endif
--
2.5.0
