Drop struct pt_regs * argument in compat_sys_execve()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/tile/include/asm/compat.h

@@ -275,9 +275,6 @@ extern int compat_setup_rt_frame(int sig, struct k_sigaction *ka,
 struct compat_sigaction;
 struct compat_siginfo;
 struct compat_sigaltstack;
-long compat_sys_execve(const char __user *path,
-		       compat_uptr_t __user *argv,
-		       compat_uptr_t __user *envp, struct pt_regs *);
 long compat_sys_rt_sigaction(int sig, struct compat_sigaction __user *act,
 			     struct compat_sigaction __user *oact,
 			     size_t sigsetsize);
@@ -304,9 +301,6 @@ long compat_sys_sched_rr_get_interval(compat_pid_t pid,
 				      struct compat_timespec __user *interval);
 
 /* These are the intvec_64.S trampolines. */
-long _compat_sys_execve(const char __user *path,
-			const compat_uptr_t __user *argv,
-			const compat_uptr_t __user *envp);
 long _compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
 			    struct compat_sigaltstack __user *uoss_ptr);
 long _compat_sys_rt_sigreturn(void);

arch/tile/include/asm/processor.h

@@ -239,6 +239,9 @@ unsigned long get_wchan(struct task_struct *p);
 #define KSTK_TOP(task)	(task_ksp0(task) - STACK_TOP_DELTA)
 #define task_pt_regs(task) \
   ((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
+#define current_pt_regs()                                   \
+  ((struct pt_regs *)((stack_pointer | (THREAD_SIZE - 1)) - \
+                      (KSTK_PTREGS_GAP - 1)) - 1)
 #define task_sp(task)	(task_pt_regs(task)->sp)
 #define task_pc(task)	(task_pt_regs(task)->pc)
 /* Aliases for pc and sp (used in fs/proc/array.c) */

arch/tile/kernel/compat.c

@@ -103,7 +103,6 @@ long compat_sys_sched_rr_get_interval(compat_pid_t pid,
 #define compat_sys_readahead sys32_readahead
 
 /* Call the trampolines to manage pt_regs where necessary. */
-#define compat_sys_execve _compat_sys_execve
 #define compat_sys_sigaltstack _compat_sys_sigaltstack
 #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
 #define sys_clone _sys_clone

arch/tile/kernel/intvec_64.S

@@ -1194,7 +1194,6 @@ PTREGS_SYSCALL(sys_execve, r3)
 PTREGS_SYSCALL(sys_sigaltstack, r2)
 PTREGS_SYSCALL_SIGRETURN(sys_rt_sigreturn, r0)
 #ifdef CONFIG_COMPAT
-PTREGS_SYSCALL(compat_sys_execve, r3)
 PTREGS_SYSCALL(compat_sys_sigaltstack, r2)
 PTREGS_SYSCALL_SIGRETURN(compat_sys_rt_sigreturn, r0)
 #endif

arch/tile/kernel/process.c

@@ -614,8 +614,7 @@ SYSCALL_DEFINE4(execve, const char __user *, path,
 #ifdef CONFIG_COMPAT
 long compat_sys_execve(const char __user *path,
 		       compat_uptr_t __user *argv,
-		       compat_uptr_t __user *envp,
-		       struct pt_regs *regs)
+		       compat_uptr_t __user *envp)
 {
 	long error;
 	struct filename *filename;
@@ -624,7 +623,8 @@ long compat_sys_execve(const char __user *path,
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		goto out;
-	error = compat_do_execve(filename->name, argv, envp, regs);
+	error = compat_do_execve(filename->name, argv, envp,
+				 current_pt_regs());
 	putname(filename);
 	if (error == 0)
 		single_step_execve();

include/linux/compat.h

@@ -286,10 +286,8 @@ asmlinkage ssize_t compat_sys_pwritev(unsigned long fd,
 
 int compat_do_execve(const char *filename, const compat_uptr_t __user *argv,
 		     const compat_uptr_t __user *envp, struct pt_regs *regs);
-#ifdef __ARCH_WANT_SYS_EXECVE
 asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
 		     const compat_uptr_t __user *envp);
-#endif
 
 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
 		compat_ulong_t __user *outp, compat_ulong_t __user *exp,