From: Helge Deller <deller@gmx.de>
Date: Thu, 16 Aug 2018 20:33:04 +0000 (+0200)
Subject: parisc: Fix ptraced 64-bit applications to call 64-bit syscalls
X-Git-Tag: v4.19-rc1~53^2~4
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b6fc0cccb6b35815a7d1cfc9279cdbfc2c61d00d;p=thirdparty%2Flinux.git

parisc: Fix ptraced 64-bit applications to call 64-bit syscalls

Fix the strace code path to call 64-bit syscalls in case we are
executing by a 64-bit application.

Signed-off-by: Helge Deller <deller@gmx.de>
---

diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 5f7e57fcaeef0..be451766e9d00 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -227,8 +227,7 @@ linux_gateway_entry:
 	or,=	%r2,%r2,%r2
 	ldo	R%sys_call_table64(%r1), %r19
 #else
-	ldil	L%sys_call_table, %r1
-	ldo     R%sys_call_table(%r1), %r19
+	load32	sys_call_table, %r19
 #endif	
 	comiclr,>>	__NR_Linux_syscalls, %r20, %r0
 	b,n	.Lsyscall_nosys
@@ -331,8 +330,6 @@ tracesys_next:
 	 *  task->thread.regs.gr[20] above.
 	 */
 	copy	%ret0,%r20
-	ldil	L%sys_call_table,%r1
-	ldo     R%sys_call_table(%r1), %r19
 
 	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
 	LDREG	TI_TASK(%r1), %r1
@@ -354,6 +351,23 @@ tracesys_next:
 	comiclr,>>	__NR_Linux_syscalls, %r20, %r0
 	b,n	.Ltracesys_nosys
 
+	/* Note!  We cannot use the syscall table that is mapped
+	nearby since the gateway page is mapped execute-only. */
+
+#ifdef CONFIG_64BIT
+	LDREG	TASK_PT_GR30(%r1), %r19		/* get users sp back */
+	extrd,u	%r19,63,1,%r2			/* W hidden in bottom bit */
+
+	ldil	L%sys_call_table, %r1
+	or,=	%r2,%r2,%r2
+	addil	L%(sys_call_table64-sys_call_table), %r1
+	ldo	R%sys_call_table(%r1), %r19
+	or,=	%r2,%r2,%r2
+	ldo	R%sys_call_table64(%r1), %r19
+#else
+	load32	sys_call_table, %r19
+#endif
+
 	LDREGX  %r20(%r19), %r19
 
 	/* If this is a sys_rt_sigreturn call, and the signal was received