sh: Teach the DWARF unwinder about modules

Pass a module's .eh_frame section to the DWARF unwinder at module load
time so that the section's FDEs and CIEs can be registered with the
DWARF unwinder. This allows us to unwind the stack through module code
when generating backtraces.

Signed-off-by: Matt Fleming <matt@console-pimps.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/sh/include/asm/dwarf.h b/arch/sh/include/asm/dwarf.h
index c367ed3373c5..aacdc746d07c 100644
--- a/arch/sh/include/asm/dwarf.h
+++ b/arch/sh/include/asm/dwarf.h
@@ -241,6 +241,12 @@ struct dwarf_cie {
 
         unsigned long flags;
 #define DWARF_CIE_Z_AUGMENTATION        (1 << 0)
+
+        /*
+         * 'mod' will be non-NULL if this CIE came from a module's
+         * .eh_frame section.
+         */
+        struct module *mod;
 };
 
 /**
@@ -255,6 +261,12 @@ struct dwarf_fde {
         unsigned char *instructions;
         unsigned char *end;
         struct list_head link;
+
+        /*
+         * 'mod' will be non-NULL if this FDE came from a module's
+         * .eh_frame section.
+         */
+        struct module *mod;
 };
 
 /**
@@ -364,6 +376,9 @@ static inline unsigned int DW_CFA_operand(unsigned long insn)
 
 extern struct dwarf_frame *dwarf_unwind_stack(unsigned long,
                                               struct dwarf_frame *);
+extern int dwarf_parse_section(char *, char *, struct module *);
+extern void dwarf_module_unload(struct module *);
+
 #endif /* !__ASSEMBLY__ */
 
 #define CFI_STARTPROC   .cfi_startproc