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.mayd...@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
