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ARC: dw2 unwind: switch to .eh_frame based unwinding

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So finally after almost 8 years of dealing with .debug_frame, we are
finally switching to .eh_frame. The reason being stripped kernel
binaries had non-functional unwinder as .debug_frame was gone.
Also, in general .eh_frame seems more common way of doing unwinding.

This also folds a revert of f52e126cc7 ("ARC: unwind: ensure that
.debug_frame is generated (vs. .eh_frame)") to ensure that we start
getting .eh_frame

Reported-by: Daniel Mentz <danielmentz@google.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-06-24 21:22:06 +05:30
parent d040876b4a
commit 6716dbbdef
5 changed files with 13 additions and 34 deletions
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13
arch/arc/kernel/module.c
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@ -22,13 +22,9 @@ static inline void arc_write_me(unsigned short *addr, unsigned long value)
*(addr + 1) = (value & 0xffff);
}
/* ARC specific section quirks - before relocation loop in generic loader
*
* For dwarf unwinding out of modules, this needs to
* 1. Ensure the .debug_frame is allocatable (ARC Linker bug: despite
* -fasynchronous-unwind-tables it doesn't).
* 2. Since we are iterating thru sec hdr tbl anyways, make a note of
* the exact section index, for later use.
/*
* This gets called before relocation loop in generic loader
* Make a note of the section index of unwinding section
*/
int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
char *secstr, struct module *mod)
@ -40,8 +36,7 @@ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
mod->arch.unw_info = NULL;
for (i = 1; i < hdr->e_shnum; i++) {
if (strcmp(secstr+sechdrs[i].sh_name, ".debug_frame") == 0) {
sechdrs[i].sh_flags |= SHF_ALLOC;
if (strcmp(secstr+sechdrs[i].sh_name, ".eh_frame") == 0) {
mod->arch.unw_sec_idx = i;
break;
}