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[Bug target/45807] Lying eh_frame r2 save info causes crashes with static libgcc_eh and libstdc++
- From: "amodra at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 30 Sep 2010 23:52:39 +0000
- Subject: [Bug target/45807] Lying eh_frame r2 save info causes crashes with static libgcc_eh and libstdc++
- Auto-submitted: auto-generated
- References: <bug-45807-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45807
--- Comment #4 from Alan Modra <amodra at gmail dot com> 2010-09-30 23:52:29 UTC ---
Caught out by sign extension rules.
Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c (revision 164818)
+++ gcc/config/rs6000/rs6000.c (working copy)
@@ -20234,8 +20242,8 @@ rs6000_emit_prologue (void)
be updated if we arrived at this function via a plt call or
toc adjusting stub. */
emit_move_insn (tmp_reg_si, gen_rtx_MEM (SImode, tmp_reg));
- toc_restore_insn = ((TARGET_32BIT ? 0x80410014 : 0xE8410028)
- ^ 0x80000000) - 0x80000000;
+ toc_restore_insn = TARGET_32BIT ? 0x80410014 : 0xE8410028;
+ toc_restore_insn = (toc_restore_insn ^ 0x80000000) - 0x80000000;
emit_insn (gen_xorsi3 (tmp_reg_si, tmp_reg_si,
GEN_INT (toc_restore_insn & ~0xffff)));
compare_result = gen_rtx_REG (CCUNSmode, CR0_REGNO);