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binutils-gdb/ld/testsuite/ld-x86-64/pcrel16-2.d

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x86: correct overflow checking for 16-bit PC-relative relocs The only insn requiring a truly 16-bit PC-relative relocation outside of 16-bit mode is XBEGIN (with an operand size override). For it, the relocation generated should behave similar to 8- and (for 64-bit) 32-bit PC-relatives ones, i.e. be checked for a signed value to fit the field. This same mode is also correct for 16-bit code. Outside of 16-bit code, branches with operand size overrides act in a truly PC-relative way only when living in the low 32k of address space, as they truncate rIP to 16 bits. This can't be expressed by a PC-relative relocation. Putting in place a new testcase, I'd like to note that the two existing ones (pcrel16 and pcrel16abs) appear to be pretty pointless: They don't expect any error despite supposedly checking for overflow, and in fact there can't possibly be any error for the - former since gas doesn't emit any relocation in the first place there, - latter because the way the relocation gets expressed by gas doesn't allow the linker to notice the overflow; it should be detected by gas if at all, but see above (an error would be reported here for x86-64 afaict, but this test doesn't get re-used there).
2021-04-26 16:41:35 +08:00
#name: PCREL16 overflow (2)
#source: ../ld-i386/pcrel16-2.s
#ld:
#error: .*relocation truncated to fit: R_X86_64_PC16 .*t16.*
#error: .*relocation truncated to fit: R_X86_64_PC16 .*_start.*
x86: Restore PC16 relocation overflow check The x86-64 psABI has --- A program or object file using R_X86_64_8, R_X86_64_16, R_X86_64_PC16 or R_X86_64_PC8 relocations is not conformant to this ABI, these relocations are only added for documentation purposes. --- Since x86 PC16 relocations have been used for 16-bit programs in an ELF32 or ELF64 container, PC16 relocation should wrap-around in 16-bit address space. Revert commit a7664973b24a242cd9ea17deb5eaf503065fc0bd Author: Jan Beulich <jbeulich@suse.com> Date: Mon Apr 26 10:41:35 2021 +0200 x86: correct overflow checking for 16-bit PC-relative relocs and xfail the related tests. Also revert commit 50c95a739c91ae70cf8481936611aa1f5397a384 Author: H.J. Lu <hjl.tools@gmail.com> Date: Wed May 26 12:13:13 2021 -0700 x86: Propery check PC16 reloc overflow in 16-bit mode instructions while keeping PR ld/27905 tests for PC16 relocation in 16-bit programs. bfd/ PR ld/27905 * elf32-i386.c: Don't include "libiberty.h". (elf_howto_table): Revert commits a7664973b24 and 50c95a739c9. (elf_i386_rtype_to_howto): Revert commit 50c95a739c9. (elf_i386_info_to_howto_rel): Likewise. (elf_i386_tls_transition): Likewise. (elf_i386_relocate_section): Likewise. * elf64-x86-64.c (x86_64_elf_howto_table): Revert commits a7664973b24 and 50c95a739c9. (elf_x86_64_rtype_to_howto): Revert commit 50c95a739c9. * elfxx-x86.c (_bfd_x86_elf_parse_gnu_properties): Likewise. * elfxx-x86.h (elf_x86_obj_tdata): Likewise. (elf_x86_has_code16): Likewise. binutils/ PR ld/27905 * readelf.c (decode_x86_feature_2): Revert commit 50c95a739c9. gas/ PR ld/27905 * config/tc-i386.c (set_code_flag): Revert commit 50c95a739c9. (set_16bit_gcc_code_flag): Likewise. (x86_cleanup): Likewise. * testsuite/gas/i386/code16-2.d: Updated. * testsuite/gas/i386/x86-64-code16-2.d: Likewise. include/ PR ld/27905 * elf/common.h (GNU_PROPERTY_X86_FEATURE_2_CODE16): Removed. ld/ PR ld/27905 * testsuite/ld-i386/pcrel16-2.d: xfail. * testsuite/ld-x86-64/pcrel16-2.d: Likewise.
2021-05-29 00:34:10 +08:00
#xfail: *-*-*
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