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authorKevin Hilman <khilman@linaro.org>2013-08-19 13:22:10 -0400
committerKevin Hilman <khilman@linaro.org>2013-08-19 13:22:31 -0400
commit5515d9981f5f30e82d096921f86ba016911c9ea8 (patch)
tree7680a87d16e2c2c1f0ca07a8606a65b53ab10ead /arch/arm/kernel
parentf668adebf43556df9834f254479a44a20294dcf1 (diff)
parentcf470a1b1a741bca00080ebc70968b4f22d9b1ea (diff)
Merge tag 'omap-for-v3.12/dra7xx' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/soc
From Tony Lindgren: Minimal DRA7xx based SoC core support via Rajendra Nayak <rnayak@ti.com> * tag 'omap-for-v3.12/dra7xx' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap: (849 commits) ARM: DRA7: Add the build support in omap2plus ARM: DRA7: hwmod: Reuse the soc_ops used for OMAP4/5 ARM: DRA7: id: Add cpu detection support for DRA7xx based SoCs' ARM: DRA7: Kconfig: Make ARCH_NR_GPIO default to 512 ARM: DRA7: board-generic: Add basic DT support ARM: DRA7: Resue the clocksource, clockevent support ARM: DRA7: Reuse io tables and add a new .init_early ARM: DRA7: Reuse all of PRCM and MPUSS SMP infra Linux 3.11-rc5 btrfs: don't loop on large offsets in readdir Btrfs: check to see if root_list is empty before adding it to dead roots Btrfs: release both paths before logging dir/changed extents Btrfs: allow splitting of hole em's when dropping extent cache Btrfs: make sure the backref walker catches all refs to our extent Btrfs: fix backref walking when we hit a compressed extent Btrfs: do not offset physical if we're compressed Btrfs: fix extent buffer leak after backref walking Btrfs: fix a bug of snapshot-aware defrag to make it work on partial extents btrfs: fix file truncation if FALLOC_FL_KEEP_SIZE is specified dlm: kill the unnecessary and wrong device_close()->recalc_sigpending() ... Signed-off-by: Kevin Hilman <khilman@linaro.org>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/entry-armv.S103
-rw-r--r--arch/arm/kernel/entry-v7m.S2
-rw-r--r--arch/arm/kernel/fiq.c19
-rw-r--r--arch/arm/kernel/head-nommu.S1
-rw-r--r--arch/arm/kernel/head.S1
-rw-r--r--arch/arm/kernel/hyp-stub.S4
-rw-r--r--arch/arm/kernel/process.c49
-rw-r--r--arch/arm/kernel/setup.c3
-rw-r--r--arch/arm/kernel/signal.c56
-rw-r--r--arch/arm/kernel/signal.h12
-rw-r--r--arch/arm/kernel/smp_tlb.c17
-rw-r--r--arch/arm/kernel/traps.c46
-rw-r--r--arch/arm/kernel/vmlinux.lds.S17
13 files changed, 211 insertions, 119 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index a39cfc2a1f90..d40d0ef389db 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -742,6 +742,18 @@ ENDPROC(__switch_to)
742#endif 742#endif
743 .endm 743 .endm
744 744
745 .macro kuser_pad, sym, size
746 .if (. - \sym) & 3
747 .rept 4 - (. - \sym) & 3
748 .byte 0
749 .endr
750 .endif
751 .rept (\size - (. - \sym)) / 4
752 .word 0xe7fddef1
753 .endr
754 .endm
755
756#ifdef CONFIG_KUSER_HELPERS
745 .align 5 757 .align 5
746 .globl __kuser_helper_start 758 .globl __kuser_helper_start
747__kuser_helper_start: 759__kuser_helper_start:
@@ -832,18 +844,13 @@ kuser_cmpxchg64_fixup:
832#error "incoherent kernel configuration" 844#error "incoherent kernel configuration"
833#endif 845#endif
834 846
835 /* pad to next slot */ 847 kuser_pad __kuser_cmpxchg64, 64
836 .rept (16 - (. - __kuser_cmpxchg64)/4)
837 .word 0
838 .endr
839
840 .align 5
841 848
842__kuser_memory_barrier: @ 0xffff0fa0 849__kuser_memory_barrier: @ 0xffff0fa0
843 smp_dmb arm 850 smp_dmb arm
844 usr_ret lr 851 usr_ret lr
845 852
846 .align 5 853 kuser_pad __kuser_memory_barrier, 32
847 854
848__kuser_cmpxchg: @ 0xffff0fc0 855__kuser_cmpxchg: @ 0xffff0fc0
849 856
@@ -916,13 +923,14 @@ kuser_cmpxchg32_fixup:
916 923
917#endif 924#endif
918 925
919 .align 5 926 kuser_pad __kuser_cmpxchg, 32
920 927
921__kuser_get_tls: @ 0xffff0fe0 928__kuser_get_tls: @ 0xffff0fe0
922 ldr r0, [pc, #(16 - 8)] @ read TLS, set in kuser_get_tls_init 929 ldr r0, [pc, #(16 - 8)] @ read TLS, set in kuser_get_tls_init
923 usr_ret lr 930 usr_ret lr
924 mrc p15, 0, r0, c13, c0, 3 @ 0xffff0fe8 hardware TLS code 931 mrc p15, 0, r0, c13, c0, 3 @ 0xffff0fe8 hardware TLS code
925 .rep 4 932 kuser_pad __kuser_get_tls, 16
933 .rep 3
926 .word 0 @ 0xffff0ff0 software TLS value, then 934 .word 0 @ 0xffff0ff0 software TLS value, then
927 .endr @ pad up to __kuser_helper_version 935 .endr @ pad up to __kuser_helper_version
928 936
@@ -932,14 +940,16 @@ __kuser_helper_version: @ 0xffff0ffc
932 .globl __kuser_helper_end 940 .globl __kuser_helper_end
933__kuser_helper_end: 941__kuser_helper_end:
934 942
943#endif
944
935 THUMB( .thumb ) 945 THUMB( .thumb )
936 946
937/* 947/*
938 * Vector stubs. 948 * Vector stubs.
939 * 949 *
940 * This code is copied to 0xffff0200 so we can use branches in the 950 * This code is copied to 0xffff1000 so we can use branches in the
941 * vectors, rather than ldr's. Note that this code must not 951 * vectors, rather than ldr's. Note that this code must not exceed
942 * exceed 0x300 bytes. 952 * a page size.
943 * 953 *
944 * Common stub entry macro: 954 * Common stub entry macro:
945 * Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC 955 * Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
@@ -986,8 +996,17 @@ ENDPROC(vector_\name)
9861: 9961:
987 .endm 997 .endm
988 998
989 .globl __stubs_start 999 .section .stubs, "ax", %progbits
990__stubs_start: 1000__stubs_start:
1001 @ This must be the first word
1002 .word vector_swi
1003
1004vector_rst:
1005 ARM( swi SYS_ERROR0 )
1006 THUMB( svc #0 )
1007 THUMB( nop )
1008 b vector_und
1009
991/* 1010/*
992 * Interrupt dispatcher 1011 * Interrupt dispatcher
993 */ 1012 */
@@ -1082,6 +1101,16 @@ __stubs_start:
1082 .align 5 1101 .align 5
1083 1102
1084/*============================================================================= 1103/*=============================================================================
1104 * Address exception handler
1105 *-----------------------------------------------------------------------------
1106 * These aren't too critical.
1107 * (they're not supposed to happen, and won't happen in 32-bit data mode).
1108 */
1109
1110vector_addrexcptn:
1111 b vector_addrexcptn
1112
1113/*=============================================================================
1085 * Undefined FIQs 1114 * Undefined FIQs
1086 *----------------------------------------------------------------------------- 1115 *-----------------------------------------------------------------------------
1087 * Enter in FIQ mode, spsr = ANY CPSR, lr = ANY PC 1116 * Enter in FIQ mode, spsr = ANY CPSR, lr = ANY PC
@@ -1094,45 +1123,19 @@ __stubs_start:
1094vector_fiq: 1123vector_fiq:
1095 subs pc, lr, #4 1124 subs pc, lr, #4
1096 1125
1097/*============================================================================= 1126 .globl vector_fiq_offset
1098 * Address exception handler 1127 .equ vector_fiq_offset, vector_fiq
1099 *-----------------------------------------------------------------------------
1100 * These aren't too critical.
1101 * (they're not supposed to happen, and won't happen in 32-bit data mode).
1102 */
1103
1104vector_addrexcptn:
1105 b vector_addrexcptn
1106
1107/*
1108 * We group all the following data together to optimise
1109 * for CPUs with separate I & D caches.
1110 */
1111 .align 5
1112
1113.LCvswi:
1114 .word vector_swi
1115
1116 .globl __stubs_end
1117__stubs_end:
1118
1119 .equ stubs_offset, __vectors_start + 0x200 - __stubs_start
1120 1128
1121 .globl __vectors_start 1129 .section .vectors, "ax", %progbits
1122__vectors_start: 1130__vectors_start:
1123 ARM( swi SYS_ERROR0 ) 1131 W(b) vector_rst
1124 THUMB( svc #0 ) 1132 W(b) vector_und
1125 THUMB( nop ) 1133 W(ldr) pc, __vectors_start + 0x1000
1126 W(b) vector_und + stubs_offset 1134 W(b) vector_pabt
1127 W(ldr) pc, .LCvswi + stubs_offset 1135 W(b) vector_dabt
1128 W(b) vector_pabt + stubs_offset 1136 W(b) vector_addrexcptn
1129 W(b) vector_dabt + stubs_offset 1137 W(b) vector_irq
1130 W(b) vector_addrexcptn + stubs_offset 1138 W(b) vector_fiq
1131 W(b) vector_irq + stubs_offset
1132 W(b) vector_fiq + stubs_offset
1133
1134 .globl __vectors_end
1135__vectors_end:
1136 1139
1137 .data 1140 .data
1138 1141
diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S
index e00621f1403f..52b26432c9a9 100644
--- a/arch/arm/kernel/entry-v7m.S
+++ b/arch/arm/kernel/entry-v7m.S
@@ -49,7 +49,7 @@ __irq_entry:
49 mov r1, sp 49 mov r1, sp
50 stmdb sp!, {lr} 50 stmdb sp!, {lr}
51 @ routine called with r0 = irq number, r1 = struct pt_regs * 51 @ routine called with r0 = irq number, r1 = struct pt_regs *
52 bl nvic_do_IRQ 52 bl nvic_handle_irq
53 53
54 pop {lr} 54 pop {lr}
55 @ 55 @
diff --git a/arch/arm/kernel/fiq.c b/arch/arm/kernel/fiq.c
index 2adda11f712f..25442f451148 100644
--- a/arch/arm/kernel/fiq.c
+++ b/arch/arm/kernel/fiq.c
@@ -47,6 +47,11 @@
47#include <asm/irq.h> 47#include <asm/irq.h>
48#include <asm/traps.h> 48#include <asm/traps.h>
49 49
50#define FIQ_OFFSET ({ \
51 extern void *vector_fiq_offset; \
52 (unsigned)&vector_fiq_offset; \
53 })
54
50static unsigned long no_fiq_insn; 55static unsigned long no_fiq_insn;
51 56
52/* Default reacquire function 57/* Default reacquire function
@@ -80,13 +85,16 @@ int show_fiq_list(struct seq_file *p, int prec)
80void set_fiq_handler(void *start, unsigned int length) 85void set_fiq_handler(void *start, unsigned int length)
81{ 86{
82#if defined(CONFIG_CPU_USE_DOMAINS) 87#if defined(CONFIG_CPU_USE_DOMAINS)
83 memcpy((void *)0xffff001c, start, length); 88 void *base = (void *)0xffff0000;
84#else 89#else
85 memcpy(vectors_page + 0x1c, start, length); 90 void *base = vectors_page;
86#endif 91#endif
87 flush_icache_range(0xffff001c, 0xffff001c + length); 92 unsigned offset = FIQ_OFFSET;
93
94 memcpy(base + offset, start, length);
95 flush_icache_range(0xffff0000 + offset, 0xffff0000 + offset + length);
88 if (!vectors_high()) 96 if (!vectors_high())
89 flush_icache_range(0x1c, 0x1c + length); 97 flush_icache_range(offset, offset + length);
90} 98}
91 99
92int claim_fiq(struct fiq_handler *f) 100int claim_fiq(struct fiq_handler *f)
@@ -144,6 +152,7 @@ EXPORT_SYMBOL(disable_fiq);
144 152
145void __init init_FIQ(int start) 153void __init init_FIQ(int start)
146{ 154{
147 no_fiq_insn = *(unsigned long *)0xffff001c; 155 unsigned offset = FIQ_OFFSET;
156 no_fiq_insn = *(unsigned long *)(0xffff0000 + offset);
148 fiq_start = start; 157 fiq_start = start;
149} 158}
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index b361de143756..14235ba64a90 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S
@@ -87,6 +87,7 @@ ENTRY(stext)
87ENDPROC(stext) 87ENDPROC(stext)
88 88
89#ifdef CONFIG_SMP 89#ifdef CONFIG_SMP
90 .text
90ENTRY(secondary_startup) 91ENTRY(secondary_startup)
91 /* 92 /*
92 * Common entry point for secondary CPUs. 93 * Common entry point for secondary CPUs.
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 9cf6063020ae..2c7cc1e03473 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -343,6 +343,7 @@ __turn_mmu_on_loc:
343 .long __turn_mmu_on_end 343 .long __turn_mmu_on_end
344 344
345#if defined(CONFIG_SMP) 345#if defined(CONFIG_SMP)
346 .text
346ENTRY(secondary_startup) 347ENTRY(secondary_startup)
347 /* 348 /*
348 * Common entry point for secondary CPUs. 349 * Common entry point for secondary CPUs.
diff --git a/arch/arm/kernel/hyp-stub.S b/arch/arm/kernel/hyp-stub.S
index 4910232c4833..797b1a6a4906 100644
--- a/arch/arm/kernel/hyp-stub.S
+++ b/arch/arm/kernel/hyp-stub.S
@@ -56,8 +56,8 @@ ENTRY(__boot_cpu_mode)
56 ldr \reg3, [\reg2] 56 ldr \reg3, [\reg2]
57 ldr \reg1, [\reg2, \reg3] 57 ldr \reg1, [\reg2, \reg3]
58 cmp \mode, \reg1 @ matches primary CPU boot mode? 58 cmp \mode, \reg1 @ matches primary CPU boot mode?
59 orrne r7, r7, #BOOT_CPU_MODE_MISMATCH 59 orrne \reg1, \reg1, #BOOT_CPU_MODE_MISMATCH
60 strne r7, [r5, r6] @ record what happened and give up 60 strne \reg1, [\reg2, \reg3] @ record what happened and give up
61 .endm 61 .endm
62 62
63#else /* ZIMAGE */ 63#else /* ZIMAGE */
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index d3ca4f6915af..536c85fe72a8 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -197,6 +197,7 @@ void machine_shutdown(void)
197 */ 197 */
198void machine_halt(void) 198void machine_halt(void)
199{ 199{
200 local_irq_disable();
200 smp_send_stop(); 201 smp_send_stop();
201 202
202 local_irq_disable(); 203 local_irq_disable();
@@ -211,6 +212,7 @@ void machine_halt(void)
211 */ 212 */
212void machine_power_off(void) 213void machine_power_off(void)
213{ 214{
215 local_irq_disable();
214 smp_send_stop(); 216 smp_send_stop();
215 217
216 if (pm_power_off) 218 if (pm_power_off)
@@ -230,6 +232,7 @@ void machine_power_off(void)
230 */ 232 */
231void machine_restart(char *cmd) 233void machine_restart(char *cmd)
232{ 234{
235 local_irq_disable();
233 smp_send_stop(); 236 smp_send_stop();
234 237
235 arm_pm_restart(reboot_mode, cmd); 238 arm_pm_restart(reboot_mode, cmd);
@@ -426,10 +429,11 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
426} 429}
427 430
428#ifdef CONFIG_MMU 431#ifdef CONFIG_MMU
432#ifdef CONFIG_KUSER_HELPERS
429/* 433/*
430 * The vectors page is always readable from user space for the 434 * The vectors page is always readable from user space for the
431 * atomic helpers and the signal restart code. Insert it into the 435 * atomic helpers. Insert it into the gate_vma so that it is visible
432 * gate_vma so that it is visible through ptrace and /proc/<pid>/mem. 436 * through ptrace and /proc/<pid>/mem.
433 */ 437 */
434static struct vm_area_struct gate_vma = { 438static struct vm_area_struct gate_vma = {
435 .vm_start = 0xffff0000, 439 .vm_start = 0xffff0000,
@@ -458,9 +462,48 @@ int in_gate_area_no_mm(unsigned long addr)
458{ 462{
459 return in_gate_area(NULL, addr); 463 return in_gate_area(NULL, addr);
460} 464}
465#define is_gate_vma(vma) ((vma) = &gate_vma)
466#else
467#define is_gate_vma(vma) 0
468#endif
461 469
462const char *arch_vma_name(struct vm_area_struct *vma) 470const char *arch_vma_name(struct vm_area_struct *vma)
463{ 471{
464 return (vma == &gate_vma) ? "[vectors]" : NULL; 472 return is_gate_vma(vma) ? "[vectors]" :
473 (vma->vm_mm && vma->vm_start == vma->vm_mm->context.sigpage) ?
474 "[sigpage]" : NULL;
475}
476
477static struct page *signal_page;
478extern struct page *get_signal_page(void);
479
480int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
481{
482 struct mm_struct *mm = current->mm;
483 unsigned long addr;
484 int ret;
485
486 if (!signal_page)
487 signal_page = get_signal_page();
488 if (!signal_page)
489 return -ENOMEM;
490
491 down_write(&mm->mmap_sem);
492 addr = get_unmapped_area(NULL, 0, PAGE_SIZE, 0, 0);
493 if (IS_ERR_VALUE(addr)) {
494 ret = addr;
495 goto up_fail;
496 }
497
498 ret = install_special_mapping(mm, addr, PAGE_SIZE,
499 VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
500 &signal_page);
501
502 if (ret == 0)
503 mm->context.sigpage = addr;
504
505 up_fail:
506 up_write(&mm->mmap_sem);
507 return ret;
465} 508}
466#endif 509#endif
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 63af9a7ae512..afc2489ee13b 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -836,6 +836,8 @@ static int __init meminfo_cmp(const void *_a, const void *_b)
836void __init hyp_mode_check(void) 836void __init hyp_mode_check(void)
837{ 837{
838#ifdef CONFIG_ARM_VIRT_EXT 838#ifdef CONFIG_ARM_VIRT_EXT
839 sync_boot_mode();
840
839 if (is_hyp_mode_available()) { 841 if (is_hyp_mode_available()) {
840 pr_info("CPU: All CPU(s) started in HYP mode.\n"); 842 pr_info("CPU: All CPU(s) started in HYP mode.\n");
841 pr_info("CPU: Virtualization extensions available.\n"); 843 pr_info("CPU: Virtualization extensions available.\n");
@@ -971,6 +973,7 @@ static const char *hwcap_str[] = {
971 "vfpv4", 973 "vfpv4",
972 "idiva", 974 "idiva",
973 "idivt", 975 "idivt",
976 "vfpd32",
974 "lpae", 977 "lpae",
975 NULL 978 NULL
976}; 979};
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 1c16c35c271a..ab3304225272 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -8,6 +8,7 @@
8 * published by the Free Software Foundation. 8 * published by the Free Software Foundation.
9 */ 9 */
10#include <linux/errno.h> 10#include <linux/errno.h>
11#include <linux/random.h>
11#include <linux/signal.h> 12#include <linux/signal.h>
12#include <linux/personality.h> 13#include <linux/personality.h>
13#include <linux/uaccess.h> 14#include <linux/uaccess.h>
@@ -15,12 +16,11 @@
15 16
16#include <asm/elf.h> 17#include <asm/elf.h>
17#include <asm/cacheflush.h> 18#include <asm/cacheflush.h>
19#include <asm/traps.h>
18#include <asm/ucontext.h> 20#include <asm/ucontext.h>
19#include <asm/unistd.h> 21#include <asm/unistd.h>
20#include <asm/vfp.h> 22#include <asm/vfp.h>
21 23
22#include "signal.h"
23
24/* 24/*
25 * For ARM syscalls, we encode the syscall number into the instruction. 25 * For ARM syscalls, we encode the syscall number into the instruction.
26 */ 26 */
@@ -40,11 +40,13 @@
40#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE)) 40#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE))
41#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) 41#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE))
42 42
43const unsigned long sigreturn_codes[7] = { 43static const unsigned long sigreturn_codes[7] = {
44 MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, 44 MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
45 MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN, 45 MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
46}; 46};
47 47
48static unsigned long signal_return_offset;
49
48#ifdef CONFIG_CRUNCH 50#ifdef CONFIG_CRUNCH
49static int preserve_crunch_context(struct crunch_sigframe __user *frame) 51static int preserve_crunch_context(struct crunch_sigframe __user *frame)
50{ 52{
@@ -400,14 +402,20 @@ setup_return(struct pt_regs *regs, struct ksignal *ksig,
400 __put_user(sigreturn_codes[idx+1], rc+1)) 402 __put_user(sigreturn_codes[idx+1], rc+1))
401 return 1; 403 return 1;
402 404
403 if ((cpsr & MODE32_BIT) && !IS_ENABLED(CONFIG_ARM_MPU)) { 405#ifdef CONFIG_MMU
406 if (cpsr & MODE32_BIT) {
407 struct mm_struct *mm = current->mm;
408
404 /* 409 /*
405 * 32-bit code can use the new high-page 410 * 32-bit code can use the signal return page
406 * signal return code support except when the MPU has 411 * except when the MPU has protected the vectors
407 * protected the vectors page from PL0 412 * page from PL0
408 */ 413 */
409 retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb; 414 retcode = mm->context.sigpage + signal_return_offset +
410 } else { 415 (idx << 2) + thumb;
416 } else
417#endif
418 {
411 /* 419 /*
412 * Ensure that the instruction cache sees 420 * Ensure that the instruction cache sees
413 * the return code written onto the stack. 421 * the return code written onto the stack.
@@ -608,3 +616,33 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
608 } while (thread_flags & _TIF_WORK_MASK); 616 } while (thread_flags & _TIF_WORK_MASK);
609 return 0; 617 return 0;
610} 618}
619
620struct page *get_signal_page(void)
621{
622 unsigned long ptr;
623 unsigned offset;
624 struct page *page;
625 void *addr;
626
627 page = alloc_pages(GFP_KERNEL, 0);
628
629 if (!page)
630 return NULL;
631
632 addr = page_address(page);
633
634 /* Give the signal return code some randomness */
635 offset = 0x200 + (get_random_int() & 0x7fc);
636 signal_return_offset = offset;
637
638 /*
639 * Copy signal return handlers into the vector page, and
640 * set sigreturn to be a pointer to these.
641 */
642 memcpy(addr + offset, sigreturn_codes, sizeof(sigreturn_codes));
643
644 ptr = (unsigned long)addr + offset;
645 flush_icache_range(ptr, ptr + sizeof(sigreturn_codes));
646
647 return page;
648}
diff --git a/arch/arm/kernel/signal.h b/arch/arm/kernel/signal.h
deleted file mode 100644
index 5ff067b7c752..000000000000
--- a/arch/arm/kernel/signal.h
+++ /dev/null
@@ -1,12 +0,0 @@
1/*
2 * linux/arch/arm/kernel/signal.h
3 *
4 * Copyright (C) 2005-2009 Russell King.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#define KERN_SIGRETURN_CODE (CONFIG_VECTORS_BASE + 0x00000500)
11
12extern const unsigned long sigreturn_codes[7];
diff --git a/arch/arm/kernel/smp_tlb.c b/arch/arm/kernel/smp_tlb.c
index a98b62dca2fa..c2edfff573c2 100644
--- a/arch/arm/kernel/smp_tlb.c
+++ b/arch/arm/kernel/smp_tlb.c
@@ -70,23 +70,6 @@ static inline void ipi_flush_bp_all(void *ignored)
70 local_flush_bp_all(); 70 local_flush_bp_all();
71} 71}
72 72
73#ifdef CONFIG_ARM_ERRATA_798181
74static int erratum_a15_798181(void)
75{
76 unsigned int midr = read_cpuid_id();
77
78 /* Cortex-A15 r0p0..r3p2 affected */
79 if ((midr & 0xff0ffff0) != 0x410fc0f0 || midr > 0x413fc0f2)
80 return 0;
81 return 1;
82}
83#else
84static int erratum_a15_798181(void)
85{
86 return 0;
87}
88#endif
89
90static void ipi_flush_tlb_a15_erratum(void *arg) 73static void ipi_flush_tlb_a15_erratum(void *arg)
91{ 74{
92 dmb(); 75 dmb();
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index cab094c234ee..ab517fcce21b 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -35,8 +35,6 @@
35#include <asm/tls.h> 35#include <asm/tls.h>
36#include <asm/system_misc.h> 36#include <asm/system_misc.h>
37 37
38#include "signal.h"
39
40static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" }; 38static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" };
41 39
42void *vectors_page; 40void *vectors_page;
@@ -800,15 +798,26 @@ void __init trap_init(void)
800 return; 798 return;
801} 799}
802 800
803static void __init kuser_get_tls_init(unsigned long vectors) 801#ifdef CONFIG_KUSER_HELPERS
802static void __init kuser_init(void *vectors)
804{ 803{
804 extern char __kuser_helper_start[], __kuser_helper_end[];
805 int kuser_sz = __kuser_helper_end - __kuser_helper_start;
806
807 memcpy(vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz);
808
805 /* 809 /*
806 * vectors + 0xfe0 = __kuser_get_tls 810 * vectors + 0xfe0 = __kuser_get_tls
807 * vectors + 0xfe8 = hardware TLS instruction at 0xffff0fe8 811 * vectors + 0xfe8 = hardware TLS instruction at 0xffff0fe8
808 */ 812 */
809 if (tls_emu || has_tls_reg) 813 if (tls_emu || has_tls_reg)
810 memcpy((void *)vectors + 0xfe0, (void *)vectors + 0xfe8, 4); 814 memcpy(vectors + 0xfe0, vectors + 0xfe8, 4);
811} 815}
816#else
817static void __init kuser_init(void *vectors)
818{
819}
820#endif
812 821
813void __init early_trap_init(void *vectors_base) 822void __init early_trap_init(void *vectors_base)
814{ 823{
@@ -816,33 +825,30 @@ void __init early_trap_init(void *vectors_base)
816 unsigned long vectors = (unsigned long)vectors_base; 825 unsigned long vectors = (unsigned long)vectors_base;
817 extern char __stubs_start[], __stubs_end[]; 826 extern char __stubs_start[], __stubs_end[];
818 extern char __vectors_start[], __vectors_end[]; 827 extern char __vectors_start[], __vectors_end[];
819 extern char __kuser_helper_start[], __kuser_helper_end[]; 828 unsigned i;
820 int kuser_sz = __kuser_helper_end - __kuser_helper_start;
821 829
822 vectors_page = vectors_base; 830 vectors_page = vectors_base;
823 831
824 /* 832 /*
833 * Poison the vectors page with an undefined instruction. This
834 * instruction is chosen to be undefined for both ARM and Thumb
835 * ISAs. The Thumb version is an undefined instruction with a
836 * branch back to the undefined instruction.
837 */
838 for (i = 0; i < PAGE_SIZE / sizeof(u32); i++)
839 ((u32 *)vectors_base)[i] = 0xe7fddef1;
840
841 /*
825 * Copy the vectors, stubs and kuser helpers (in entry-armv.S) 842 * Copy the vectors, stubs and kuser helpers (in entry-armv.S)
826 * into the vector page, mapped at 0xffff0000, and ensure these 843 * into the vector page, mapped at 0xffff0000, and ensure these
827 * are visible to the instruction stream. 844 * are visible to the instruction stream.
828 */ 845 */
829 memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start); 846 memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start);
830 memcpy((void *)vectors + 0x200, __stubs_start, __stubs_end - __stubs_start); 847 memcpy((void *)vectors + 0x1000, __stubs_start, __stubs_end - __stubs_start);
831 memcpy((void *)vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz);
832 848
833 /* 849 kuser_init(vectors_base);
834 * Do processor specific fixups for the kuser helpers
835 */
836 kuser_get_tls_init(vectors);
837
838 /*
839 * Copy signal return handlers into the vector page, and
840 * set sigreturn to be a pointer to these.
841 */
842 memcpy((void *)(vectors + KERN_SIGRETURN_CODE - CONFIG_VECTORS_BASE),
843 sigreturn_codes, sizeof(sigreturn_codes));
844 850
845 flush_icache_range(vectors, vectors + PAGE_SIZE); 851 flush_icache_range(vectors, vectors + PAGE_SIZE * 2);
846 modify_domain(DOMAIN_USER, DOMAIN_CLIENT); 852 modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
847#else /* ifndef CONFIG_CPU_V7M */ 853#else /* ifndef CONFIG_CPU_V7M */
848 /* 854 /*
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index fa25e4e425f6..7bcee5c9b604 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -148,6 +148,23 @@ SECTIONS
148 . = ALIGN(PAGE_SIZE); 148 . = ALIGN(PAGE_SIZE);
149 __init_begin = .; 149 __init_begin = .;
150#endif 150#endif
151 /*
152 * The vectors and stubs are relocatable code, and the
153 * only thing that matters is their relative offsets
154 */
155 __vectors_start = .;
156 .vectors 0 : AT(__vectors_start) {
157 *(.vectors)
158 }
159 . = __vectors_start + SIZEOF(.vectors);
160 __vectors_end = .;
161
162 __stubs_start = .;
163 .stubs 0x1000 : AT(__stubs_start) {
164 *(.stubs)
165 }
166 . = __stubs_start + SIZEOF(.stubs);
167 __stubs_end = .;
151 168
152 INIT_TEXT_SECTION(8) 169 INIT_TEXT_SECTION(8)
153 .exit.text : { 170 .exit.text : {