+// 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,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ 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,
+ prelocs, reloc_count, 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));
+ }
+}
+