linux-user: Correct definition of stack_t

Some platforms used the wrong definition of stack_t where the flags and
size fields were swapped or where the flags field had type ulong instead
of int.

Due to the presence of padding space in the structure and the prevalence
of little-endian machines this problem went unnoticed for a long time.

The type definitions have been cross-checked with the ones defined in
the Linux kernel v5.9, plus some older versions for a few architecture
that have been removed and Xilinx's kernel fork for NiosII [1].

The bsd-user headers remain unchanged as I don't know if they are wrong
or not.

[1] https://github.com/Xilinx/linux-xlnx/blob/master/arch/nios2/include/uapi/asm/signal.h

Signed-off-by: Giuseppe Musacchio <thatlemon@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <e9d47692-ee92-009f-6007-0abc3f502b97@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/alpha/target_signal.h

@@ -42,8 +42,7 @@
 
 typedef struct target_sigaltstack {
     abi_ulong ss_sp;
-    int32_t ss_flags;
-    int32_t dummy;
+    abi_int ss_flags;
     abi_ulong ss_size;
 } target_stack_t;
 

linux-user/arm/target_signal.h

@@ -4,9 +4,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_ulong ss_sp;
-	abi_long ss_flags;
-	abi_ulong ss_size;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
 } target_stack_t;
 
 

linux-user/cris/target_signal.h

@@ -4,9 +4,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_ulong ss_sp;
-	abi_ulong ss_size;
-	abi_long ss_flags;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
 } target_stack_t;
 
 

linux-user/hppa/target_signal.h

@@ -44,7 +44,7 @@
 
 typedef struct target_sigaltstack {
     abi_ulong ss_sp;
-    int32_t ss_flags;
+    abi_int ss_flags;
     abi_ulong ss_size;
 } target_stack_t;
 

linux-user/i386/target_signal.h

@@ -4,9 +4,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_ulong ss_sp;
-	abi_long ss_flags;
-	abi_ulong ss_size;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
 } target_stack_t;
 
 

linux-user/m68k/target_signal.h

@@ -4,9 +4,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_ulong ss_sp;
-	abi_long ss_flags;
-	abi_ulong ss_size;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
 } target_stack_t;
 
 

linux-user/microblaze/target_signal.h

@@ -4,9 +4,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_ulong ss_sp;
-	abi_ulong ss_size;
-	abi_long ss_flags;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
 } target_stack_t;
 
 

linux-user/mips/target_signal.h

@@ -45,9 +45,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_long ss_sp;
-	abi_ulong ss_size;
-	abi_long ss_flags;
+    abi_ulong ss_sp;
+    abi_ulong ss_size;
+    abi_int ss_flags;
 } target_stack_t;
 
 

linux-user/mips64/target_signal.h

@@ -45,12 +45,11 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_long ss_sp;
-	abi_ulong ss_size;
-	abi_int ss_flags;
+    abi_ulong ss_sp;
+    abi_ulong ss_size;
+    abi_int ss_flags;
 } target_stack_t;
 
-
 /*
  * sigaltstack controls
  */

linux-user/nios2/target_signal.h

@@ -4,11 +4,12 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-    abi_long ss_sp;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
     abi_ulong ss_size;
-    abi_long ss_flags;
 } target_stack_t;
 
+
 /* sigaltstack controls  */
 #define TARGET_SS_ONSTACK     1
 #define TARGET_SS_DISABLE     2

linux-user/ppc/target_signal.h

@@ -4,9 +4,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_ulong ss_sp;
-	int ss_flags;
-	abi_ulong ss_size;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
 } target_stack_t;
 
 

linux-user/s390x/target_signal.h

@@ -3,7 +3,7 @@
 
 typedef struct target_sigaltstack {
     abi_ulong ss_sp;
-    int ss_flags;
+    abi_int ss_flags;
     abi_ulong ss_size;
 } target_stack_t;
 

linux-user/sh4/target_signal.h

@@ -4,9 +4,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_ulong ss_sp;
-	abi_long ss_flags;
-	abi_ulong ss_size;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
 } target_stack_t;
 
 

linux-user/sparc/target_signal.h

@@ -42,9 +42,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_ulong ss_sp;
-	abi_long ss_flags;
-	abi_ulong ss_size;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
 } target_stack_t;
 
 

linux-user/x86_64/target_signal.h

@@ -4,9 +4,9 @@
 /* this struct defines a stack used during syscall handling */
 
 typedef struct target_sigaltstack {
-	abi_ulong ss_sp;
-	abi_long ss_flags;
-	abi_ulong ss_size;
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
 } target_stack_t;