From 05d0e962f08af24f18cc79b890a68176b42bcb78 Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Fri, 3 Aug 2018 16:41:22 +0930 Subject: R_PPC64_REL24_NOTOC support R_PPC64_REL24_NOTOC is used on calls like "bl foo@notoc" to tell the linker that linkage stubs for PLT calls or long branches can't use r2 for pic addressing. Instead, new stubs that generate pc-relative addresses are used. One complication is that pc-relative offsets to the PLT may need to be 64-bit in large programs, in contrast to the toc-relative addressing used by older PLT linkage stubs where a 32-bit offset is sufficient until the PLT itself exceeds 2G in size. .eh_frame info to cover the _notoc stubs is yet to be implemented. bfd/ * elf64-ppc.c (ADDI_R12_R11, ADDI_R12_R12, LIS_R12), (ADDIS_R12_R11, ORIS_R12_R12_0, ORI_R12_R12_0), (SLDI_R12_R12_32, LDX_R12_R11_R12, ADD_R12_R11_R12): Define. (ppc64_elf_howto_raw): Add R_PPC64_REL24_NOTOC entry. (ppc64_elf_reloc_type_lookup): Support R_PPC64_REL24_NOTOC. (ppc_stub_type): Add ppc_stub_long_branch_notoc, ppc_stub_long_branch_both, ppc_stub_plt_branch_notoc, ppc_stub_plt_branch_both, ppc_stub_plt_call_notoc, and ppc_stub_plt_call_both. (is_branch_reloc): Add R_PPC64_REL24_NOTOC. (build_offset, size_offset): New functions. (plt_stub_size): Support plt_call_notoc and plt_call_both. (ppc_build_one_stub, ppc_size_one_stub): Support new stubs. (toc_adjusting_stub_needed): Handle R_PPC64_REL24_NOTOC. (ppc64_elf_size_stubs): Likewise, and new stubs. (ppc64_elf_build_stubs, ppc64_elf_relocate_section): Likewise. * reloc.c: Add BFD_RELOC_PPC64_REL24_NOTOC. * bfd-in2.h: Regenerate. * libbfd.h: Regenerate. gas/ * config/tc-ppc.c (ppc_elf_suffix): Support @notoc. (ppc_force_relocation, ppc_fix_adjustable): Handle REL24_NOTOC. ld/ * testsuite/ld-powerpc/ext.d, * testsuite/ld-powerpc/ext.s, * testsuite/ld-powerpc/ext.lnk, * testsuite/ld-powerpc/notoc.d, * testsuite/ld-powerpc/notoc.s: New tests. * testsuite/ld-powerpc/powerpc.exp: Run them. --- gas/config/tc-ppc.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'gas/config/tc-ppc.c') diff --git a/gas/config/tc-ppc.c b/gas/config/tc-ppc.c index eaa866d..6135cb4 100644 --- a/gas/config/tc-ppc.c +++ b/gas/config/tc-ppc.c @@ -2085,6 +2085,7 @@ ppc_elf_suffix (char **str_p, expressionS *exp_p) MAP64 ("tprel@highera", BFD_RELOC_PPC64_TPREL16_HIGHERA), MAP64 ("tprel@highest", BFD_RELOC_PPC64_TPREL16_HIGHEST), MAP64 ("tprel@highesta", BFD_RELOC_PPC64_TPREL16_HIGHESTA), + MAP64 ("notoc", BFD_RELOC_PPC64_REL24_NOTOC), { (char *) 0, 0, 0, 0, BFD_RELOC_NONE } }; @@ -6416,6 +6417,7 @@ ppc_force_relocation (fixS *fix) case BFD_RELOC_PPC_BA26: case BFD_RELOC_PPC_B16: case BFD_RELOC_PPC_BA16: + case BFD_RELOC_PPC64_REL24_NOTOC: /* All branch fixups targeting a localentry symbol must force a relocation. */ if (fix->fx_addsy) @@ -6454,6 +6456,7 @@ ppc_fix_adjustable (fixS *fix) case BFD_RELOC_PPC_B16_BRNTAKEN: case BFD_RELOC_PPC_BA16_BRTAKEN: case BFD_RELOC_PPC_BA16_BRNTAKEN: + case BFD_RELOC_PPC64_REL24_NOTOC: if (fix->fx_addsy) { asymbol *bfdsym = symbol_get_bfdsym (fix->fx_addsy); -- cgit v1.1