diff options
| author | Vincent Chen <vincent.chen@sifive.com> | 2021-03-22 22:26:05 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2021-04-26 08:24:57 -0700 |
| commit | 800149a77c2cb8746a94457939b1ba1e37d2c14e (patch) | |
| tree | a31cd1e131fc9259b2d7a12b62fe5958587b420b /arch/riscv/kernel/entry.S | |
| parent | 1a0e5dbd3723e1194cc549def69fe7b557d4c72b (diff) | |
| download | linux-800149a77c2cb8746a94457939b1ba1e37d2c14e.tar.bz2 | |
riscv: sifive: Apply errata "cip-453" patch
Add sign extension to the $badaddr before addressing the instruction page
fault and instruction access fault to workaround the issue "cip-453".
To avoid affecting the existing code sequence, this patch will creates two
trampolines to add sign extension to the $badaddr. By the "alternative"
mechanism, these two trampolines will replace the original exception
handler of instruction page fault and instruction access fault in the
excp_vect_table. In this case, only the specific SiFive CPU core jumps to
the do_page_fault and do_trap_insn_fault through these two trampolines.
Other CPUs are not affected.
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/kernel/entry.S')
| -rw-r--r-- | arch/riscv/kernel/entry.S | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 744f3209c48d..60d0a2f1cd88 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -12,6 +12,7 @@ #include <asm/unistd.h> #include <asm/thread_info.h> #include <asm/asm-offsets.h> +#include <asm/errata_list.h> #if !IS_ENABLED(CONFIG_PREEMPTION) .set resume_kernel, restore_all @@ -450,7 +451,7 @@ ENDPROC(__switch_to) /* Exception vector table */ ENTRY(excp_vect_table) RISCV_PTR do_trap_insn_misaligned - RISCV_PTR do_trap_insn_fault + ALT_INSN_FAULT(RISCV_PTR do_trap_insn_fault) RISCV_PTR do_trap_insn_illegal RISCV_PTR do_trap_break RISCV_PTR do_trap_load_misaligned @@ -461,7 +462,8 @@ ENTRY(excp_vect_table) RISCV_PTR do_trap_ecall_s RISCV_PTR do_trap_unknown RISCV_PTR do_trap_ecall_m - RISCV_PTR do_page_fault /* instruction page fault */ + /* instruciton page fault */ + ALT_PAGE_FAULT(RISCV_PTR do_page_fault) RISCV_PTR do_page_fault /* load page fault */ RISCV_PTR do_trap_unknown RISCV_PTR do_page_fault /* store page fault */ |