[PATCH v6 04/18] powerpc/64s: Move and rename do_bad_slb_fault as it is not hash specific
From: Nicholas Piggin <npiggin@gmail.com>
Date: 2021-12-01 14:45:24
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
slb.c is hash-specific SLB management, but do_bad_slb_fault deals with segment interrupts that occur with radix MMU as well. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- arch/powerpc/include/asm/interrupt.h | 2 +- arch/powerpc/kernel/exceptions-64s.S | 4 ++-- arch/powerpc/mm/book3s64/slb.c | 16 ---------------- arch/powerpc/mm/fault.c | 24 ++++++++++++++++++++++++ 4 files changed, 27 insertions(+), 19 deletions(-)
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
index a1d238255f07..3487aab12229 100644
--- a/arch/powerpc/include/asm/interrupt.h
+++ b/arch/powerpc/include/asm/interrupt.h@@ -564,7 +564,7 @@ DECLARE_INTERRUPT_HANDLER(kernel_bad_stack); /* slb.c */ DECLARE_INTERRUPT_HANDLER_RAW(do_slb_fault); -DECLARE_INTERRUPT_HANDLER(do_bad_slb_fault); +DECLARE_INTERRUPT_HANDLER(do_bad_segment_interrupt); /* hash_utils.c */ DECLARE_INTERRUPT_HANDLER_RAW(do_hash_fault);
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index eaf1f72131a1..046c99e31d01 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S@@ -1430,7 +1430,7 @@ MMU_FTR_SECTION_ELSE ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) std r3,RESULT(r1) addi r3,r1,STACK_FRAME_OVERHEAD - bl do_bad_slb_fault + bl do_bad_segment_interrupt b interrupt_return_srr
@@ -1510,7 +1510,7 @@ MMU_FTR_SECTION_ELSE ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) std r3,RESULT(r1) addi r3,r1,STACK_FRAME_OVERHEAD - bl do_bad_slb_fault + bl do_bad_segment_interrupt b interrupt_return_srr
diff --git a/arch/powerpc/mm/book3s64/slb.c b/arch/powerpc/mm/book3s64/slb.c
index f0037bcc47a0..31f4cef3adac 100644
--- a/arch/powerpc/mm/book3s64/slb.c
+++ b/arch/powerpc/mm/book3s64/slb.c@@ -868,19 +868,3 @@ DEFINE_INTERRUPT_HANDLER_RAW(do_slb_fault) return err; } } - -DEFINE_INTERRUPT_HANDLER(do_bad_slb_fault) -{ - int err = regs->result; - - if (err == -EFAULT) { - if (user_mode(regs)) - _exception(SIGSEGV, regs, SEGV_BNDERR, regs->dar); - else - bad_page_fault(regs, SIGSEGV); - } else if (err == -EINVAL) { - unrecoverable_exception(regs); - } else { - BUG(); - } -}
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index a8d0ce85d39a..2d4a411c7c85 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c@@ -35,6 +35,7 @@ #include <linux/kfence.h> #include <linux/pkeys.h> +#include <asm/asm-prototypes.h> #include <asm/firmware.h> #include <asm/interrupt.h> #include <asm/page.h>
@@ -620,4 +621,27 @@ DEFINE_INTERRUPT_HANDLER(do_bad_page_fault_segv) { bad_page_fault(regs, SIGSEGV); } + +/* + * In radix, segment interrupts indicate the EA is not addressable by the + * page table geometry, so they are always sent here. + * + * In hash, this is called if do_slb_fault returns error. Typically it is + * because the EA was outside the region allowed by software. + */ +DEFINE_INTERRUPT_HANDLER(do_bad_segment_interrupt) +{ + int err = regs->result; + + if (err == -EFAULT) { + if (user_mode(regs)) + _exception(SIGSEGV, regs, SEGV_BNDERR, regs->dar); + else + bad_page_fault(regs, SIGSEGV); + } else if (err == -EINVAL) { + unrecoverable_exception(regs); + } else { + BUG(); + } +} #endif
--
2.23.0