From: Weinan Liu <[email protected]> DWARF CFI (Call Frame Information) specifies how to recover the return address and callee-saved registers at each PC in a given function. Compilers are able to generate the CFI annotations when they compile the code to assembly language. For handcrafted assembly, we need to annotate them by hand.
Annotate CFI unwind info for assembly for interrupt and exception handlers. Signed-off-by: Weinan Liu <[email protected]> Signed-off-by: Dylan Hatch <[email protected]> --- arch/arm64/kernel/entry.S | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index f8018b5c1f9a..3148ede8c2c6 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -575,7 +575,12 @@ SYM_CODE_START_LOCAL(el\el\ht\()_\regsize\()_\label) .if \el == 0 b ret_to_user .else + .cfi_startproc + .cfi_def_cfa_offset PT_REGS_SIZE + .cfi_offset 29, S_FP - PT_REGS_SIZE + .cfi_offset 30, S_LR - PT_REGS_SIZE b ret_to_kernel + .cfi_endproc .endif SYM_CODE_END(el\el\ht\()_\regsize\()_\label) .endm @@ -889,6 +894,10 @@ SYM_FUNC_START(call_on_irq_stack) add sp, x16, #IRQ_STACK_SIZE restore_irq x9 blr x1 + .cfi_startproc + .cfi_def_cfa 29, 16 + .cfi_offset 29, -16 + .cfi_offset 30, -8 save_and_disable_daif x9 /* @@ -900,6 +909,7 @@ SYM_FUNC_START(call_on_irq_stack) scs_load_current restore_irq x9 ret + .cfi_endproc SYM_FUNC_END(call_on_irq_stack) NOKPROBE(call_on_irq_stack) -- 2.51.0.355.g5224444f11-goog
