[PATCH for-5.2 3/3] linux-user/sparc: Don't zero high half of PC, NPC, PSR in sigreturn

[Peter Maydell]

The function do_sigreturn() tries to store the PC, NPC and PSR in
uint32_t local variables, which implicitly drops the high half of
these fields for 64-bit guests.

The usual effect was that a guest which used signals would crash on
return from a signal unless it was lucky enough to take it while the
PC was in the low 4GB of the address space.  In particular, Debian
/bin/dash and /bin/bash would segfault after executing external
commands.

Use abi_ulong, which is the type these fields all have in the
__siginfo_t struct.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 linux-user/sparc/signal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/linux-user/sparc/signal.c b/linux-user/sparc/signal.c
index c315704b389..d12adc8e6ff 100644
--- a/linux-user/sparc/signal.c
+++ b/linux-user/sparc/signal.c
@@ -247,7 +247,7 @@ long do_sigreturn(CPUSPARCState *env)
 {
     abi_ulong sf_addr;
     struct target_signal_frame *sf;
-    uint32_t up_psr, pc, npc;
+    abi_ulong up_psr, pc, npc;
     target_sigset_t set;
     sigset_t host_set;
     int i;
-- 
2.20.1