ia64, mips, x86_64: remove no longer used parsers of sigreturn syscalls

As there is no sigreturn syscall on ia64, mips n32, mips n64, x32,
and x86_64, no longer used parsers could be safely removed.

* linux/ia64/arch_sigreturn.c: Remove.
* Makefile.am (EXTRA_DIST): Remove it.
* linux/mips/arch_sigreturn.c (arch_sigreturn): Remove [!LINUX_MIPSO32].
* linux/x86_64/arch_sigreturn.c (arch_sigreturn): Remove.

4 files changed, 4 insertions, 56 deletions

diff --git a/Makefile.am b/Makefile.am
index 61aa7ea00..c77f463f0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -462,7 +462,6 @@ EXTRA_DIST =				\
 	linux/ia64/arch_regs.c		\
 	linux/ia64/arch_regs.h		\
 	linux/ia64/arch_rt_sigframe.c	\
-	linux/ia64/arch_sigreturn.c	\
 	linux/ia64/get_error.c		\
 	linux/ia64/get_scno.c		\
 	linux/ia64/get_syscall_args.c	\
diff --git a/linux/ia64/arch_sigreturn.c b/linux/ia64/arch_sigreturn.c
deleted file mode 100644
index 32f9bc588..000000000
--- a/linux/ia64/arch_sigreturn.c
+++ /dev/null
@@ -1,12 +0,0 @@
-static void
-arch_sigreturn(struct tcb *tcp)
-{
-	/* offsetof(struct sigframe, sc) */
-#define OFFSETOF_STRUCT_SIGFRAME_SC	0xA0
-	const unsigned long addr = *ia64_frame_ptr + 16 +
-				   OFFSETOF_STRUCT_SIGFRAME_SC +
-				   offsetof(struct sigcontext, sc_mask);
-	tprints("{mask=");
-	print_sigset_addr(tcp, addr);
-	tprints("}");
-}
diff --git a/linux/mips/arch_sigreturn.c b/linux/mips/arch_sigreturn.c
index 8ce460965..522b73152 100644
--- a/linux/mips/arch_sigreturn.c
+++ b/linux/mips/arch_sigreturn.c
@@ -1,26 +1,17 @@
 static void
 arch_sigreturn(struct tcb *tcp)
 {
-#if defined LINUX_MIPSO32
+	/* 64-bit ABIs do not have old sigreturn. */
+#ifdef LINUX_MIPSO32
 	/*
 	 * offsetof(struct sigframe, sf_mask) ==
 	 * sizeof(sf_ass) + sizeof(sf_pad) + sizeof(struct sigcontext)
 	 */
 	const kernel_ulong_t addr = mips_REG_SP + 6 * 4 +
 				   sizeof(struct sigcontext);
-#else
-	/*
-	 * This decodes rt_sigreturn.
-	 * The 64-bit ABIs do not have sigreturn.
-	 *
-	 * offsetof(struct rt_sigframe, rs_uc) ==
-	 * sizeof(sf_ass) + sizeof(sf_pad) + sizeof(struct siginfo)
-	 */
-	const kernel_ulong_t addr = mips_REG_SP + 6 * 4 + 128 +
-				   offsetof(struct ucontext, uc_sigmask);
-#endif
 
 	tprints("{mask=");
 	print_sigset_addr(tcp, addr);
 	tprints("}");
+#endif
 }
diff --git a/linux/x86_64/arch_sigreturn.c b/linux/x86_64/arch_sigreturn.c
index 16cadc2ca..9f4f0d879 100644
--- a/linux/x86_64/arch_sigreturn.c
+++ b/linux/x86_64/arch_sigreturn.c
@@ -1,32 +1,2 @@
-#define	arch_sigreturn	i386_arch_sigreturn
+/* Only x86 personality has old sigreturn syscall. */
 #include "i386/arch_sigreturn.c"
-#undef arch_sigreturn
-
-static void
-arch_sigreturn(struct tcb *tcp)
-{
-	if (current_personality == 1) {
-		i386_arch_sigreturn(tcp);
-		return;
-	}
-
-	typedef struct {
-		uint32_t flags, link, stack[3], pad;
-		struct sigcontext mcontext;
-	} ucontext_x32_header;
-
-#define	X86_64_SIGMASK_OFFSET	offsetof(struct ucontext, uc_sigmask)
-#define	X32_SIGMASK_OFFSET	sizeof(ucontext_x32_header)
-
-	const kernel_ulong_t offset =
-#ifdef X32
-		X32_SIGMASK_OFFSET;
-#else
-		current_personality == 2 ? X32_SIGMASK_OFFSET :
-					   X86_64_SIGMASK_OFFSET;
-#endif
-	const kernel_ulong_t addr = (kernel_ulong_t) *x86_64_rsp_ptr + offset;
-	tprints("{mask=");
-	print_sigset_addr(tcp, addr);
-	tprints("}");
-}