linux-user: Split out helpers for sigsuspend

Two new functions: process_sigsuspend_mask and finish_sigsuspend_mask.
Move the size check and copy-from-user code.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220315084308.433109-3-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

1 files changed, 23 insertions, 0 deletions

diff --git a/linux-user/signal.c b/linux-user/signal.c
index 2a3f3cc23f..092e70b80c 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -1199,3 +1199,26 @@ void process_pending_signals(CPUArchState *cpu_env)
     }
     ts->in_sigsuspend = 0;
 }
+
+int process_sigsuspend_mask(sigset_t **pset, target_ulong sigset,
+                            target_ulong sigsize)
+{
+    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    sigset_t *host_set = &ts->sigsuspend_mask;
+    target_sigset_t *target_sigset;
+
+    if (sigsize != sizeof(*target_sigset)) {
+        /* Like the kernel, we enforce correct size sigsets */
+        return -TARGET_EINVAL;
+    }
+
+    target_sigset = lock_user(VERIFY_READ, sigset, sigsize, 1);
+    if (!target_sigset) {
+        return -TARGET_EFAULT;
+    }
+    target_to_host_sigset(host_set, target_sigset);
+    unlock_user(target_sigset, sigset, 0);
+
+    *pset = host_set;
+    return 0;
+}