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[Bug backtrace/14646] [x32] backtrace doesn't work before main
- From: "hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Sun, 30 Sep 2012 21:16:04 +0000
- Subject: [Bug backtrace/14646] [x32] backtrace doesn't work before main
- Auto-submitted: auto-generated
- References: <bug-14646-4717@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=14646
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2012-09-30 21:16:04 UTC ---
amd64_x32_init_abi has
tdep->sp_regnum_from_eax = AMD64_RSP_REGNUM;
tdep->pc_regnum_from_eax = AMD64_RIP_REGNUM;
But unwind frame info is based on the real RSP/RIP
registers. Pseudo sp/pc registers don't work with
frame related codes:
[hjl@gnu-tools-1 gdb]$ egrep "pc_regnum|sp_regnum" *fram*.c
dwarf2-frame.c: if (regnum == gdbarch_pc_regnum (gdbarch))
dwarf2-frame.c: else if (regnum == gdbarch_sp_regnum (gdbarch))
dwarf2-frame.c: == gdbarch_sp_regnum (gdbarch)))
dwarf2-frame-tailcall.c: if (regnum == gdbarch_pc_regnum (this_gdbarch))
dwarf2-frame-tailcall.c: else if (cache->prev_sp_p && regnum ==
gdbarch_sp_regnum (this_gdbarch))
dwarf2-frame-tailcall.c: int sp_regnum;
dwarf2-frame-tailcall.c: sp_regnum = gdbarch_sp_regnum (prev_gdbarch);
dwarf2-frame-tailcall.c: if (sp_regnum == -1)
dwarf2-frame-tailcall.c: prev_sp = frame_unwind_register_unsigned
(this_frame, sp_regnum);
frame.c: && gdbarch_pc_regnum (gdbarch) >= 0
frame.c: gdbarch_pc_regnum (gdbarch),
frame.c: gdbarch_pc_regnum (gdbarch),
frame.c: the gdbarch_sp_regnum register is meaningful. */
frame.c: if (gdbarch_sp_regnum (gdbarch) >= 0)
frame.c: gdbarch_sp_regnum (gdbarch));
[hjl@gnu-tools-1 gdb]$
It is to print
(gdb) p $sp
$1 = (void *) 0xffffd028
instead of
(gdb) p $sp
$1 = 4294955048
But it breaks frame unwind.
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