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List: linux-parisc
Subject: [PATCH] parisc: Restore possibility to execute 64-bit
From: Helge Deller <deller () gmx ! de>
Date: 2018-08-16 20:39:50
Message-ID: 20180816203950.GA17558 () p100 ! box
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applications
Reply-To:
Executing 64-bit applications was broken. This patch restores this
support and cleans up some code paths.
Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/arch/parisc/include/asm/elf.h b/arch/parisc/include/asm/elf.h
index f019d3e..d00973a 100644
--- a/arch/parisc/include/asm/elf.h
+++ b/arch/parisc/include/asm/elf.h
@@ -235,6 +235,7 @@ typedef unsigned long elf_greg_t;
#define SET_PERSONALITY(ex) \
({ \
set_personality((current->personality & ~PER_MASK) | PER_LINUX); \
+ clear_thread_flag(TIF_32BIT); \
current->thread.map_base = DEFAULT_MAP_BASE; \
current->thread.task_size = DEFAULT_TASK_SIZE; \
})
@@ -243,9 +244,11 @@ typedef unsigned long elf_greg_t;
#define COMPAT_SET_PERSONALITY(ex) \
({ \
- set_thread_flag(TIF_32BIT); \
- current->thread.map_base = DEFAULT_MAP_BASE32; \
- current->thread.task_size = DEFAULT_TASK_SIZE32; \
+ if ((ex).e_ident[EI_CLASS] == ELFCLASS32) { \
+ set_thread_flag(TIF_32BIT); \
+ current->thread.map_base = DEFAULT_MAP_BASE32; \
+ current->thread.task_size = DEFAULT_TASK_SIZE32; \
+ } else clear_thread_flag(TIF_32BIT); \
})
/*
diff --git a/arch/parisc/include/asm/processor.h b/arch/parisc/include/asm/processor.h
index 2dbe558..2bd5e69 100644
--- a/arch/parisc/include/asm/processor.h
+++ b/arch/parisc/include/asm/processor.h
@@ -256,11 +256,7 @@ on downward growing arches, it looks like this:
* it in here from the current->personality
*/
-#ifdef CONFIG_64BIT
-#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
-#else
-#define USER_WIDE_MODE 0
-#endif
+#define USER_WIDE_MODE (!is_32bit_task())
#define start_thread(regs, new_pc, new_sp) do { \
elf_addr_t *sp = (elf_addr_t *)new_sp; \
diff --git a/arch/parisc/include/asm/traps.h b/arch/parisc/include/asm/traps.h
index e000132..8ecc1f0 100644
--- a/arch/parisc/include/asm/traps.h
+++ b/arch/parisc/include/asm/traps.h
@@ -2,7 +2,9 @@
#ifndef __ASM_TRAPS_H
#define __ASM_TRAPS_H
-#ifdef __KERNEL__
+#define PARISC_ITLB_TRAP 6 /* defined by architecture. Do not change. */
+
+#if !defined(__ASSEMBLY__)
struct pt_regs;
/* traps.c */
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 1b4732e..ef1402c 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -36,6 +36,7 @@
#include <asm/signal.h>
#include <asm/unistd.h>
#include <asm/ldcw.h>
+#include <asm/traps.h>
#include <asm/thread_info.h>
#include <linux/linkage.h>
@@ -692,7 +693,7 @@ ENTRY(fault_vector_20)
def 3
extint 4
def 5
- itlb_20 6
+ itlb_20 PARISC_ITLB_TRAP
def 7
def 8
def 9
@@ -735,7 +736,7 @@ ENTRY(fault_vector_11)
def 3
extint 4
def 5
- itlb_11 6
+ itlb_11 PARISC_ITLB_TRAP
def 7
def 8
def 9
@@ -1068,21 +1069,12 @@ ENTRY_CFI(intr_save) /* for os_hpmc */
save_specials %r29
/* If this trap is a itlb miss, skip saving/adjusting isr/ior */
+ cmpib,COND(=),n PARISC_ITLB_TRAP,%r26,skip_save_ior
- /*
- * FIXME: 1) Use a #define for the hardwired "6" below (and in
- * traps.c.
- * 2) Once we start executing code above 4 Gb, we need
- * to adjust iasq/iaoq here in the same way we
- * adjust isr/ior below.
- */
-
- cmpib,COND(=),n 6,%r26,skip_save_ior
-
- mfctl %cr20, %r16 /* isr */
+ mfctl %isr, %r16
nop /* serialize mfctl on PA 2.0 to avoid 4 cycle penalty */
- mfctl %cr21, %r17 /* ior */
+ mfctl %ior, %r17
#ifdef CONFIG_64BIT
@@ -1094,22 +1086,34 @@ ENTRY_CFI(intr_save) /* for os_hpmc */
extrd,u,*<> %r8,PSW_W_BIT,1,%r0
depdi 0,1,2,%r17
- /*
- * FIXME: This code has hardwired assumptions about the split
- * between space bits and offset bits. This will change
- * when we allow alternate page sizes.
- */
-
- /* adjust isr/ior. */
- extrd,u %r16,63,SPACEID_SHIFT,%r1 /* get high bits from isr for ior */
- depd %r1,31,SPACEID_SHIFT,%r17 /* deposit them into ior */
- depdi 0,63,SPACEID_SHIFT,%r16 /* clear them from isr */
+ /* adjust isr/ior: get high bits from isr and deposit in ior */
+ space_adjust %r16,%r17,%r1
#endif
STREG %r16, PT_ISR(%r29)
STREG %r17, PT_IOR(%r29)
+#if 0 && defined(CONFIG_64BIT)
+ /* Revisit when we have 64-bit code above 4Gb */
+ b,n intr_save2
skip_save_ior:
+ /* We have a itlb miss, and when executing code above 4 Gb on ILP64, we
+ * need to adjust iasq/iaoq here in the same way we adjusted isr/ior
+ * above.
+ */
+ extrd,u,* %r8,PSW_W_BIT,1,%r1
+ cmpib,COND(=),n 1,%r1,intr_save2
+ LDREG PT_IASQ0(%r29), %r16
+ LDREG PT_IAOQ0(%r29), %r17
+ /* adjust iasq/iaoq */
+ space_adjust %r16,%r17,%r1
+ STREG %r16, PT_IASQ0(%r29)
+ STREG %r17, PT_IAOQ0(%r29)
+#else
+skip_save_ior:
+#endif
+
+intr_save2:
virt_map
save_general %r29
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index 43b308c..376ea0d 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -156,11 +156,6 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
int do_color_align, last_mmap;
struct vm_unmapped_area_info info;
-#ifdef CONFIG_64BIT
- /* This should only ever run for 32-bit processes. */
- BUG_ON(!test_thread_flag(TIF_32BIT));
-#endif
-
/* requested length too big for entire address space */
if (len > TASK_SIZE)
return -ENOMEM;
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 4309ad3..ebef30a 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -557,7 +560,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
cpu_lpmc(5, regs);
return;
- case 6:
+ case PARISC_ITLB_TRAP:
/* Instruction TLB miss fault/Instruction page fault */
fault_address = regs->iaoq[0];
fault_space = regs->iasq[0];
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