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Diffstat (limited to 'arch/sh/kernel/traps_64.c')
-rw-r--r--arch/sh/kernel/traps_64.c35
1 files changed, 5 insertions, 30 deletions
diff --git a/arch/sh/kernel/traps_64.c b/arch/sh/kernel/traps_64.c
index a85831cbf18b..267e5ebbb475 100644
--- a/arch/sh/kernel/traps_64.c
+++ b/arch/sh/kernel/traps_64.c
@@ -370,7 +370,6 @@ static int generate_and_check_address(struct pt_regs *regs,
370 return -1; 370 return -1;
371 } 371 }
372 372
373#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
374 /* Check accessible. For misaligned access in the kernel, assume the 373 /* Check accessible. For misaligned access in the kernel, assume the
375 address is always accessible (and if not, just fault when the 374 address is always accessible (and if not, just fault when the
376 load/store gets done.) */ 375 load/store gets done.) */
@@ -380,18 +379,13 @@ static int generate_and_check_address(struct pt_regs *regs,
380 } 379 }
381 /* Do access_ok check later - it depends on whether it's a load or a store. */ 380 /* Do access_ok check later - it depends on whether it's a load or a store. */
382 } 381 }
383#endif
384 382
385 *address = addr; 383 *address = addr;
386 return 0; 384 return 0;
387} 385}
388 386
389/* Default value as for sh */
390#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
391static int user_mode_unaligned_fixup_count = 10; 387static int user_mode_unaligned_fixup_count = 10;
392static int user_mode_unaligned_fixup_enable = 1; 388static int user_mode_unaligned_fixup_enable = 1;
393#endif
394
395static int kernel_mode_unaligned_fixup_count = 32; 389static int kernel_mode_unaligned_fixup_count = 32;
396 390
397static void misaligned_kernel_word_load(__u64 address, int do_sign_extend, __u64 *result) 391static void misaligned_kernel_word_load(__u64 address, int do_sign_extend, __u64 *result)
@@ -440,7 +434,6 @@ static int misaligned_load(struct pt_regs *regs,
440 } 434 }
441 435
442 destreg = (opcode >> 4) & 0x3f; 436 destreg = (opcode >> 4) & 0x3f;
443#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
444 if (user_mode(regs)) { 437 if (user_mode(regs)) {
445 __u64 buffer; 438 __u64 buffer;
446 439
@@ -470,9 +463,7 @@ static int misaligned_load(struct pt_regs *regs,
470 width_shift, (unsigned long) regs->pc); 463 width_shift, (unsigned long) regs->pc);
471 break; 464 break;
472 } 465 }
473 } else 466 } else {
474#endif
475 {
476 /* kernel mode - we can take short cuts since if we fault, it's a genuine bug */ 467 /* kernel mode - we can take short cuts since if we fault, it's a genuine bug */
477 __u64 lo, hi; 468 __u64 lo, hi;
478 469
@@ -519,7 +510,6 @@ static int misaligned_store(struct pt_regs *regs,
519 } 510 }
520 511
521 srcreg = (opcode >> 4) & 0x3f; 512 srcreg = (opcode >> 4) & 0x3f;
522#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
523 if (user_mode(regs)) { 513 if (user_mode(regs)) {
524 __u64 buffer; 514 __u64 buffer;
525 515
@@ -546,9 +536,7 @@ static int misaligned_store(struct pt_regs *regs,
546 if (__copy_user((void *)(int)address, &buffer, (1 << width_shift)) > 0) { 536 if (__copy_user((void *)(int)address, &buffer, (1 << width_shift)) > 0) {
547 return -1; /* fault */ 537 return -1; /* fault */
548 } 538 }
549 } else 539 } else {
550#endif
551 {
552 /* kernel mode - we can take short cuts since if we fault, it's a genuine bug */ 540 /* kernel mode - we can take short cuts since if we fault, it's a genuine bug */
553 __u64 val = regs->regs[srcreg]; 541 __u64 val = regs->regs[srcreg];
554 542
@@ -576,7 +564,6 @@ static int misaligned_store(struct pt_regs *regs,
576 564
577} 565}
578 566
579#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
580/* Never need to fix up misaligned FPU accesses within the kernel since that's a real 567/* Never need to fix up misaligned FPU accesses within the kernel since that's a real
581 error. */ 568 error. */
582static int misaligned_fpu_load(struct pt_regs *regs, 569static int misaligned_fpu_load(struct pt_regs *regs,
@@ -727,7 +714,6 @@ static int misaligned_fpu_store(struct pt_regs *regs,
727 return -1; 714 return -1;
728 } 715 }
729} 716}
730#endif
731 717
732static int misaligned_fixup(struct pt_regs *regs) 718static int misaligned_fixup(struct pt_regs *regs)
733{ 719{
@@ -735,12 +721,8 @@ static int misaligned_fixup(struct pt_regs *regs)
735 int error; 721 int error;
736 int major, minor; 722 int major, minor;
737 723
738#if !defined(CONFIG_SH64_USER_MISALIGNED_FIXUP) 724 if (!user_mode_unaligned_fixup_enable)
739 /* Never fixup user mode misaligned accesses without this option enabled. */ 725 return -1;
740 return -1;
741#else
742 if (!user_mode_unaligned_fixup_enable) return -1;
743#endif
744 726
745 error = read_opcode(regs->pc, &opcode, user_mode(regs)); 727 error = read_opcode(regs->pc, &opcode, user_mode(regs));
746 if (error < 0) { 728 if (error < 0) {
@@ -749,15 +731,12 @@ static int misaligned_fixup(struct pt_regs *regs)
749 major = (opcode >> 26) & 0x3f; 731 major = (opcode >> 26) & 0x3f;
750 minor = (opcode >> 16) & 0xf; 732 minor = (opcode >> 16) & 0xf;
751 733
752#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
753 if (user_mode(regs) && (user_mode_unaligned_fixup_count > 0)) { 734 if (user_mode(regs) && (user_mode_unaligned_fixup_count > 0)) {
754 --user_mode_unaligned_fixup_count; 735 --user_mode_unaligned_fixup_count;
755 /* Only do 'count' worth of these reports, to remove a potential DoS against syslog */ 736 /* Only do 'count' worth of these reports, to remove a potential DoS against syslog */
756 printk("Fixing up unaligned userspace access in \"%s\" pid=%d pc=0x%08x ins=0x%08lx\n", 737 printk("Fixing up unaligned userspace access in \"%s\" pid=%d pc=0x%08x ins=0x%08lx\n",
757 current->comm, task_pid_nr(current), (__u32)regs->pc, opcode); 738 current->comm, task_pid_nr(current), (__u32)regs->pc, opcode);
758 } else 739 } else if (!user_mode(regs) && (kernel_mode_unaligned_fixup_count > 0)) {
759#endif
760 if (!user_mode(regs) && (kernel_mode_unaligned_fixup_count > 0)) {
761 --kernel_mode_unaligned_fixup_count; 740 --kernel_mode_unaligned_fixup_count;
762 if (in_interrupt()) { 741 if (in_interrupt()) {
763 printk("Fixing up unaligned kernelspace access in interrupt pc=0x%08x ins=0x%08lx\n", 742 printk("Fixing up unaligned kernelspace access in interrupt pc=0x%08x ins=0x%08lx\n",
@@ -830,7 +809,6 @@ static int misaligned_fixup(struct pt_regs *regs)
830 } 809 }
831 break; 810 break;
832 811
833#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
834 case (0x94>>2): /* FLD.S */ 812 case (0x94>>2): /* FLD.S */
835 error = misaligned_fpu_load(regs, opcode, 1, 2, 0); 813 error = misaligned_fpu_load(regs, opcode, 1, 2, 0);
836 break; 814 break;
@@ -881,7 +859,6 @@ static int misaligned_fixup(struct pt_regs *regs)
881 break; 859 break;
882 } 860 }
883 break; 861 break;
884#endif
885 862
886 default: 863 default:
887 /* Fault */ 864 /* Fault */
@@ -907,7 +884,6 @@ static ctl_table unaligned_table[] = {
907 .mode = 0644, 884 .mode = 0644,
908 .proc_handler = &proc_dointvec 885 .proc_handler = &proc_dointvec
909 }, 886 },
910#if defined(CONFIG_SH64_USER_MISALIGNED_FIXUP)
911 { 887 {
912 .ctl_name = CTL_UNNUMBERED, 888 .ctl_name = CTL_UNNUMBERED,
913 .procname = "user_reports", 889 .procname = "user_reports",
@@ -923,7 +899,6 @@ static ctl_table unaligned_table[] = {
923 .maxlen = sizeof(int), 899 .maxlen = sizeof(int),
924 .mode = 0644, 900 .mode = 0644,
925 .proc_handler = &proc_dointvec}, 901 .proc_handler = &proc_dointvec},
926#endif
927 {} 902 {}
928}; 903};
929 904