[Qemu-devel] [PATCH 6/6] linux-user/signal.c: Remove unnecessary wrapper copy_siginfo_to_user

[Peter Maydell <peter.maydell@linaro.org>]

The function copy_siginfo_to_user() just calls tswap_siginfo(), so
call the latter function directly and delete the wrapper function.
The wrapper is actually misleading since it implies that the
semantics are like the kernel function with the same name which
copies the data to a guest user-space address. In fact tswap_siginfo()
just does data-structure conversion between two structures whose
addresses are host addresses (the copy to userspace is handled
in QEMU by the lock_user/unlock_user calls).

This also fixes clang complaints about the wrapper being unused
in some configs.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 linux-user/signal.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/linux-user/signal.c b/linux-user/signal.c
index fa955ef..8065710 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -732,12 +732,6 @@ int do_sigaction(int sig, const struct target_sigaction *act,
     return ret;
 }
 
-static inline void copy_siginfo_to_user(target_siginfo_t *tinfo,
-                                       const target_siginfo_t *info)
-{
-    tswap_siginfo(tinfo, info);
-}
-
 #if defined(TARGET_I386) && TARGET_ABI_BITS == 32
 
 /* from the Linux kernel */
@@ -986,7 +980,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
     __put_user(addr, &frame->pinfo);
         addr = frame_addr + offsetof(struct rt_sigframe, uc);
     __put_user(addr, &frame->puc);
-	copy_siginfo_to_user(&frame->info, info);
+    tswap_siginfo(&frame->info, info);
 
 	/* Create the ucontext.  */
     __put_user(0, &frame->uc.tuc_flags);
@@ -1353,7 +1347,7 @@ static void target_setup_frame(int usig, struct target_sigaction *ka,
     env->pc = ka->_sa_handler;
     env->xregs[30] = return_addr;
     if (info) {
-        copy_siginfo_to_user(&frame->info, info);
+        tswap_siginfo(&frame->info, info);
         env->xregs[1] = frame_addr + offsetof(struct target_rt_sigframe, info);
         env->xregs[2] = frame_addr + offsetof(struct target_rt_sigframe, uc);
     }
@@ -1770,7 +1764,7 @@ static void setup_rt_frame_v1(int usig, struct target_sigaction *ka,
 	__put_user(info_addr, &frame->pinfo);
         uc_addr = frame_addr + offsetof(struct rt_sigframe_v1, uc);
 	__put_user(uc_addr, &frame->puc);
-	copy_siginfo_to_user(&frame->info, info);
+        tswap_siginfo(&frame->info, info);
 
 	/* Clear all the bits of the ucontext we don't use.  */
 	memset(&frame->uc, 0, offsetof(struct target_ucontext_v1, tuc_mcontext));
@@ -1808,7 +1802,7 @@ static void setup_rt_frame_v2(int usig, struct target_sigaction *ka,
 
         info_addr = frame_addr + offsetof(struct rt_sigframe_v2, info);
         uc_addr = frame_addr + offsetof(struct rt_sigframe_v2, uc);
-	copy_siginfo_to_user(&frame->info, info);
+        tswap_siginfo(&frame->info, info);
 
         setup_sigframe_v2(&frame->uc, set, env);
 
@@ -3010,7 +3004,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
 
     install_sigtramp(frame->rs_code, TARGET_NR_rt_sigreturn);
 
-    copy_siginfo_to_user(&frame->rs_info, info);
+    tswap_siginfo(&frame->rs_info, info);
 
     __put_user(0, &frame->rs_uc.tuc_flags);
     __put_user(0, &frame->rs_uc.tuc_link);
@@ -3275,7 +3269,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
 	goto give_sigsegv;
 
-    copy_siginfo_to_user(&frame->info, info);
+    tswap_siginfo(&frame->info, info);
 
     /* Create the ucontext.  */
     __put_user(0, &frame->uc.tuc_flags);
@@ -3934,7 +3928,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
     __put_user(uc_addr, &frame->puc);
 
     if (ka->sa_flags & SA_SIGINFO) {
-        copy_siginfo_to_user(&frame->info, info);
+        tswap_siginfo(&frame->info, info);
     }
 
     /*err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));*/
@@ -4182,7 +4176,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
     }
 
     qemu_log("%s: 1\n", __FUNCTION__);
-    copy_siginfo_to_user(&frame->info, info);
+    tswap_siginfo(&frame->info, info);
 
     /* Create the ucontext.  */
     __put_user(0, &frame->uc.tuc_flags);
@@ -4757,7 +4751,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
     if (!lock_user_struct(VERIFY_WRITE, rt_sf, rt_sf_addr, 1))
         goto sigsegv;
 
-    copy_siginfo_to_user(&rt_sf->info, info);
+    tswap_siginfo(&rt_sf->info, info);
 
     __put_user(0, &rt_sf->uc.tuc_flags);
     __put_user(0, &rt_sf->uc.tuc_link);
@@ -5177,7 +5171,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
     uc_addr = frame_addr + offsetof(struct target_rt_sigframe, uc);
     __put_user(uc_addr, &frame->puc);
 
-    copy_siginfo_to_user(&frame->info, info);
+    tswap_siginfo(&frame->info, info);
 
     /* Create the ucontext */
 
@@ -5454,7 +5448,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
         goto give_sigsegv;
     }
 
-    copy_siginfo_to_user(&frame->info, info);
+    tswap_siginfo(&frame->info, info);
 
     __put_user(0, &frame->uc.tuc_flags);
     __put_user(0, &frame->uc.tuc_link);
-- 
1.9.1