From 81f2de00830e7d68add0c12b68a3c67778acaf6d Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kostik@pooma.home>
Date: Sat, 6 Mar 2010 18:08:44 +0200
Subject: [PATCH] Add implementation of unw_is_signal_frame for freebsd.
---
src/x86_64/Gis_signal_frame.c | 31 +++++++++++++++++++++++++++++--
1 file changed, 29 insertions(+), 2 deletions(-)
diff --git a/src/x86_64/Gis_signal_frame.c b/src/x86_64/Gis_signal_frame.c
index e51fc672..3bee93a8 100644
--- a/src/x86_64/Gis_signal_frame.c
+++ b/src/x86_64/Gis_signal_frame.c
@@ -72,8 +72,35 @@ PROTECTED int
unw_is_signal_frame (unw_cursor_t *cursor)
{
/* XXXKIB */
- printf ("%s: implement me\n", __FUNCTION__);
- return -UNW_ENOINFO;
+ struct cursor *c = (struct cursor *) cursor;
+ unw_word_t w0, w1, w2, w3, w4, ip;
+ unw_addr_space_t as;
+ unw_accessors_t *a;
+ void *arg;
+ int ret;
+
+ as = c->dwarf.as;
+ a = unw_get_accessors (as);
+ arg = c->dwarf.as_arg;
+
+ /* Check if RIP points at sigreturn sequence.
+48 8d 7c 24 10 lea SIGF_UC(%rsp),%rdi
+6a 00 pushq $0
+48 c7 c0 a1 01 00 00 movq $SYS_sigreturn,%rax
+0f 05 syscall
+f4 0: hlt
+eb fd jmp 0b
+ */
+
+ ip = c->dwarf.ip;
+ if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0
+ || (ret = (*a->access_mem) (as, ip + 8, &w1, 0, arg)) < 0
+ || (ret = (*a->access_mem) (as, ip + 16, &w2, 0, arg)) < 0)
+ return 0;
+ w2 &= 0xffffff;
+ return (w0 == 0x48006a10247c8d48 &&
+ w1 == 0x050f000001a1c0c7 &&
+ w2 == 0x0000000000fdebf4);
}
#else /* __linux__ */