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Diffstat (limited to 'arch/parisc/kernel/syscall.S')
-rw-r--r--arch/parisc/kernel/syscall.S35
1 files changed, 21 insertions, 14 deletions
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 5f7e57fcaeef..f453997a7b8f 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -108,12 +108,8 @@ linux_gateway_entry:
mtsp %r0,%sr6 /* get kernel space into sr6 */
#ifdef CONFIG_64BIT
- /* for now we can *always* set the W bit on entry to the syscall
- * since we don't support wide userland processes. We could
- * also save the current SM other than in r0 and restore it on
- * exit from the syscall, and also use that value to know
- * whether to do narrow or wide syscalls. -PB
- */
+ /* Store W bit on entry to the syscall in case it's a wide userland
+ * process. */
ssm PSW_SM_W, %r1
extrd,u %r1,PSW_W_BIT,1,%r1
/* sp must be aligned on 4, so deposit the W bit setting into
@@ -227,8 +223,7 @@ 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 +326,6 @@ 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 +347,23 @@ 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
@@ -464,16 +474,13 @@ tracesys_sigexit:
lws_start:
#ifdef CONFIG_64BIT
- /* FIXME: If we are a 64-bit kernel just
- * turn this on unconditionally.
- */
ssm PSW_SM_W, %r1
extrd,u %r1,PSW_W_BIT,1,%r1
/* sp must be aligned on 4, so deposit the W bit setting into
* the bottom of sp temporarily */
or,ev %r1,%r30,%r30
- /* Clip LWS number to a 32-bit value always */
+ /* Clip LWS number to a 32-bit value for 32-bit processes */
depdi 0, 31, 32, %r20
#endif