diff options
Diffstat (limited to 'gold/powerpc.cc')
| -rw-r--r-- | gold/powerpc.cc | 122 |
1 files changed, 120 insertions, 2 deletions
diff --git a/gold/powerpc.cc b/gold/powerpc.cc index 3e9fe81..540e197 100644 --- a/gold/powerpc.cc +++ b/gold/powerpc.cc @@ -624,6 +624,13 @@ class Target_powerpc : public Sized_target<size, big_endian> do_can_check_for_function_pointers() const { return true; } + // Adjust -fsplit-stack code which calls non-split-stack code. + void + do_calls_non_split(Relobj* object, unsigned int shndx, + section_offset_type fnoffset, section_size_type fnsize, + unsigned char* view, section_size_type view_size, + std::string* from, std::string* to) const; + // Relocate a section. void relocate_section(const Relocate_info<size, big_endian>*, @@ -3175,12 +3182,15 @@ static const uint32_t addi_0_12 = 0x380c0000; static const uint32_t addi_2_2 = 0x38420000; static const uint32_t addi_3_3 = 0x38630000; static const uint32_t addi_11_11 = 0x396b0000; +static const uint32_t addi_12_1 = 0x39810000; static const uint32_t addi_12_12 = 0x398c0000; static const uint32_t addis_0_2 = 0x3c020000; static const uint32_t addis_0_13 = 0x3c0d0000; +static const uint32_t addis_2_12 = 0x3c4c0000; static const uint32_t addis_11_2 = 0x3d620000; static const uint32_t addis_11_11 = 0x3d6b0000; static const uint32_t addis_11_30 = 0x3d7e0000; +static const uint32_t addis_12_1 = 0x3d810000; static const uint32_t addis_12_2 = 0x3d820000; static const uint32_t addis_12_12 = 0x3d8c0000; static const uint32_t b = 0x48000000; @@ -3188,6 +3198,7 @@ static const uint32_t bcl_20_31 = 0x429f0005; static const uint32_t bctr = 0x4e800420; static const uint32_t blr = 0x4e800020; static const uint32_t bnectr_p4 = 0x4ce20420; +static const uint32_t cmpld_7_12_0 = 0x7fac0040; static const uint32_t cmpldi_2_0 = 0x28220000; static const uint32_t cror_15_15_15 = 0x4def7b82; static const uint32_t cror_31_31_31 = 0x4ffffb82; @@ -3204,7 +3215,7 @@ static const uint32_t ld_12_12 = 0xe98c0000; static const uint32_t lfd_0_1 = 0xc8010000; static const uint32_t li_0_0 = 0x38000000; static const uint32_t li_12_0 = 0x39800000; -static const uint32_t lis_0_0 = 0x3c000000; +static const uint32_t lis_0 = 0x3c000000; static const uint32_t lis_11 = 0x3d600000; static const uint32_t lis_12 = 0x3d800000; static const uint32_t lvx_0_12_0 = 0x7c0c00ce; @@ -4619,7 +4630,7 @@ Output_data_glink<size, big_endian>::do_write(Output_file* of) } else { - write_insn<big_endian>(p, lis_0_0 + hi(indx)), p += 4; + write_insn<big_endian>(p, lis_0 + hi(indx)), p += 4; write_insn<big_endian>(p, ori_0_0_0 + l(indx)), p += 4; } } @@ -6479,6 +6490,113 @@ Target_powerpc<size, big_endian>::do_function_location( } } +// FNOFFSET in section SHNDX in OBJECT is the start of a function +// compiled with -fsplit-stack. The function calls non-split-stack +// code. Change the function to ensure it has enough stack space to +// call some random function. + +template<int size, bool big_endian> +void +Target_powerpc<size, big_endian>::do_calls_non_split( + Relobj* object, + unsigned int shndx, + section_offset_type fnoffset, + section_size_type fnsize, + unsigned char* view, + section_size_type view_size, + std::string* from, + std::string* to) const +{ + // 32-bit not supported. + if (size == 32) + { + // warn + Target::do_calls_non_split(object, shndx, fnoffset, fnsize, + view, view_size, from, to); + return; + } + + // The function always starts with + // ld %r0,-0x7000-64(%r13) # tcbhead_t.__private_ss + // addis %r12,%r1,-allocate@ha + // addi %r12,%r12,-allocate@l + // cmpld %r12,%r0 + // but note that the addis or addi may be replaced with a nop + + unsigned char *entry = view + fnoffset; + uint32_t insn = elfcpp::Swap<32, big_endian>::readval(entry); + + if ((insn & 0xffff0000) == addis_2_12) + { + /* Skip ELFv2 global entry code. */ + entry += 8; + insn = elfcpp::Swap<32, big_endian>::readval(entry); + } + + unsigned char *pinsn = entry; + bool ok = false; + const uint32_t ld_private_ss = 0xe80d8fc0; + if (insn == ld_private_ss) + { + int32_t allocate = 0; + while (1) + { + pinsn += 4; + insn = elfcpp::Swap<32, big_endian>::readval(pinsn); + if ((insn & 0xffff0000) == addis_12_1) + allocate += (insn & 0xffff) << 16; + else if ((insn & 0xffff0000) == addi_12_1 + || (insn & 0xffff0000) == addi_12_12) + allocate += ((insn & 0xffff) ^ 0x8000) - 0x8000; + else if (insn != nop) + break; + } + if (insn == cmpld_7_12_0 && pinsn == entry + 12) + { + int extra = parameters->options().split_stack_adjust_size(); + allocate -= extra; + if (allocate >= 0 || extra < 0) + { + object->error(_("split-stack stack size overflow at " + "section %u offset %0zx"), + shndx, static_cast<size_t>(fnoffset)); + return; + } + pinsn = entry + 4; + insn = addis_12_1 | (((allocate + 0x8000) >> 16) & 0xffff); + if (insn != addis_12_1) + { + elfcpp::Swap<32, big_endian>::writeval(pinsn, insn); + pinsn += 4; + insn = addi_12_12 | (allocate & 0xffff); + if (insn != addi_12_12) + { + elfcpp::Swap<32, big_endian>::writeval(pinsn, insn); + pinsn += 4; + } + } + else + { + insn = addi_12_1 | (allocate & 0xffff); + elfcpp::Swap<32, big_endian>::writeval(pinsn, insn); + pinsn += 4; + } + if (pinsn != entry + 12) + elfcpp::Swap<32, big_endian>::writeval(pinsn, nop); + + ok = true; + } + } + + if (!ok) + { + if (!object->has_no_split_stack()) + object->error(_("failed to match split-stack sequence at " + "section %u offset %0zx"), + shndx, static_cast<size_t>(fnoffset)); + } +} + // Scan relocations for a section. template<int size, bool big_endian> |