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From f5df01655a4b76d4fe415747de581d94ac593e6a Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Tue, 22 Mar 2016 16:19:29 +0000
Subject: [PATCH] x86: Stub out x86_local_resume()
its purpose seems
to be unwinding across signal handler boundaries, which cannot happen
in correct programs anyway. Replacing the whole function with
something like *(volatile char *)0=0; (i.e. crash), gets a working
libunwind
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
Upstream-Status: Pending
src/x86/Gos-linux.c | 22 +---------------------
1 file changed, 1 insertion(+), 21 deletions(-)
diff --git a/src/x86/Gos-linux.c b/src/x86/Gos-linux.c
index 31f83ba..3aaa34e 100644
--- a/src/x86/Gos-linux.c
+++ b/src/x86/Gos-linux.c
@@ -281,27 +281,7 @@ x86_r_uc_addr (ucontext_t *uc, int reg)
HIDDEN int
x86_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
{
- struct cursor *c = (struct cursor *) cursor;
- ucontext_t *uc = c->uc;
-
- /* Ensure c->pi is up-to-date. On x86, it's relatively common to be
- missing DWARF unwind info. We don't want to fail in that case,
- because the frame-chain still would let us do a backtrace at
- least. */
- dwarf_make_proc_info (&c->dwarf);
-
- if (unlikely (c->sigcontext_format != X86_SCF_NONE))
- {
- struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
-
- Debug (8, "resuming at ip=%x via sigreturn(%p)\n", c->dwarf.ip, sc);
- sigreturn (sc);
- }
- else
- {
- Debug (8, "resuming at ip=%x via setcontext()\n", c->dwarf.ip);
- setcontext (uc);
- }
+ *(volatile char *)0=0;
return -UNW_EINVAL;
}
#endif
--
1.8.3.1
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