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sh: Handle the DWARF op, DW_CFA_undefined

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Allow a DWARF register to have an undefined value. When applied to the
DWARF return address register this lets lets us label a function as
having no direct caller, e.g. kernel_thread_helper().

Signed-off-by: Matt Fleming <matt@console-pimps.org>
This commit is contained in:
Matt Fleming
2009-08-20 19:53:49 +01:00
parent 5480675dc6
commit 5580e9044d
2 changed files with 14 additions and 2 deletions
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3
arch/sh/include/asm/dwarf.h
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@ -297,6 +297,7 @@ struct dwarf_reg {
unsigned long flags;
#define DWARF_REG_OFFSET (1 << 0)
#define DWARF_VAL_OFFSET (1 << 1)
#define DWARF_UNDEFINED (1 << 2)
};
/*
@ -370,6 +371,7 @@ extern struct dwarf_frame *dwarf_unwind_stack(unsigned long,
#define CFI_DEF_CFA .cfi_def_cfa
#define CFI_REGISTER .cfi_register
#define CFI_REL_OFFSET .cfi_rel_offset
#define CFI_UNDEFINED .cfi_undefined
#else
@ -383,6 +385,7 @@ extern struct dwarf_frame *dwarf_unwind_stack(unsigned long,
#define CFI_DEF_CFA CFI_IGNORE
#define CFI_REGISTER CFI_IGNORE
#define CFI_REL_OFFSET CFI_IGNORE
#define CFI_UNDEFINED CFI_IGNORE
#ifndef __ASSEMBLY__
static inline void dwarf_unwinder_init(void)