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Diffstat (limited to 'arch/sparc/kernel/signal_32.c')
-rw-r--r--arch/sparc/kernel/signal_32.c30
1 files changed, 25 insertions, 5 deletions
diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c
index 8ce247ac04c..d54c6e53aba 100644
--- a/arch/sparc/kernel/signal_32.c
+++ b/arch/sparc/kernel/signal_32.c
@@ -519,10 +519,26 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
siginfo_t info;
int signr;
+ /* It's a lot of work and synchronization to add a new ptrace
+ * register for GDB to save and restore in order to get
+ * orig_i0 correct for syscall restarts when debugging.
+ *
+ * Although it should be the case that most of the global
+ * registers are volatile across a system call, glibc already
+ * depends upon that fact that we preserve them. So we can't
+ * just use any global register to save away the orig_i0 value.
+ *
+ * In particular %g2, %g3, %g4, and %g5 are all assumed to be
+ * preserved across a system call trap by various pieces of
+ * code in glibc.
+ *
+ * %g7 is used as the "thread register". %g6 is not used in
+ * any fixed manner. %g6 is used as a scratch register and
+ * a compiler temporary, but it's value is never used across
+ * a system call. Therefore %g6 is usable for orig_i0 storage.
+ */
if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C))
- restart_syscall = 1;
- else
- restart_syscall = 0;
+ regs->u_regs[UREG_G6] = orig_i0;
if (test_thread_flag(TIF_RESTORE_SIGMASK))
oldset = &current->saved_sigmask;
@@ -535,8 +551,12 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
* the software "in syscall" bit, directing us to not perform
* a syscall restart.
*/
- if (restart_syscall && !pt_regs_is_syscall(regs))
- restart_syscall = 0;
+ restart_syscall = 0;
+ if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C)) {
+ restart_syscall = 1;
+ orig_i0 = regs->u_regs[UREG_G6];
+ }
+
if (signr > 0) {
if (restart_syscall)