)]}'
{
  "commit": "0b1bf2fc98e2f657a5f259f369446caf39cda786",
  "tree": "016ebf8199b399524adf8a484913cf3e3989ee37",
  "parents": [
    "c915c2c95a3b38749d5a2f455ad5c91a20cb4794"
  ],
  "author": {
    "name": "Indu Bhagat",
    "email": "indu.bhagat@oracle.com",
    "time": "Sun Jul 06 12:47:05 2025 -0700"
  },
  "committer": {
    "name": "Indu Bhagat",
    "email": "indu.bhagat@oracle.com",
    "time": "Sun Jul 06 12:53:03 2025 -0700"
  },
  "message": "bfd: gas: ld: libsframe: adopt new encoding for FDE func start addr field\n\nThis patch convenes a set of changes in bfd, gas, ld, libsframe towards\nmoving to the new encoding for the \u0027sfde_func_start_address\u0027 field in\nSFrame FDE.\n\nFirst, gas must now mark all SFrame sections with the new flag\nSFRAME_F_FDE_FUNC_START_PCREL.  gas was already emitting the field\nin the said encoding.\n\n\t* gas/gen-sframe.c (output_sframe_internal): Emit the flag\n\tSFRAME_F_FDE_FUNC_START_PCREL.\n\nSimilarly for ld, adopt the new semantics of sfde_func_start_address\nconsistently.  This means:\n  - When merging SFrame sections, check that all input SFrame sections\n    have the SFRAME_F_FDE_FUNC_START_PCREL flag set.  If the check\n    fails, ld errors out.\n  - When merging SFrame sections, keep even the in-memory contents of\n    the FDE function start address (buffer passed to libsframe\n    sframe_encoder_write () for writing out) encoded in the new\n    semantics.  While it is, in theory, possible that instead of doing this\n    change here, we adjust the value of sfde_func_start_address at the final\n    write (sframe_encoder_write) time.  But latter is not favorable for\n    maintenanance and may be generally confusing for developers.\n  - When creating SFrame for PLT entries, emit flag\n    SFRAME_F_FDE_FUNC_START_PCREL.\n\ninclude/\n        * sframe-api.h (SFRAME_F_LD_MUSTHAVE_FLAGS): New definition.\nbfd/\n\t* elf-sframe.c (_bfd_elf_merge_section_sframe): Check for flag\n\tcombinatation SFRAME_F_LD_MUSTHAVE_FLAGS set for all input and\n\toutput SFrame sections.  If not, error out.  Also, adopt the new\n        semantics of function start address encoding.\n\t* bfd/elfxx-x86.c (_bfd_x86_elf_create_sframe_plt): Emit flag\n\tSFRAME_F_FDE_FUNC_START_PCREL.\n\nNext, for dumping SFrame sections, now that we are emitting the same\nencoding in GAS, non-relocatable and relocatable SFrame links, it is the\ntime to set relocate to TRUE in debug_displays[].\n\nbinutils/\n\t* dwarf.c (struct dwarf_section_display): Allow sframe sections\n\t  to now be relocated.\ngas/testsuite/\n\t* gas/cfi-sframe/cfi-sframe-aarch64-pac-ab-key-1.d: Update the\n\ttest.  Relocatable SFrame sections now display non-zero value\n\t(appropriate function start address).\n\nNow, as the SFrame sections on-disk and in-memory use the new semantics of\nsfde_func_start_address encoding (i.e., function start address is the\noffset from the sfde_func_start_address field to the start PC), the\ncalculation to make it human readable (i.e., relatable to the addresses\nin .text sections) needs adjustment.\n\nlibsframe/\n\t* sframe-dump.c (dump_sframe_func_with_fres): Adjust the\n\tfunction start address for dumping.\n\nNow that both the emission of the new encoding, and the relocation of\nsections before dumping them is in place, it is time to adjust the\ntestcases.\n\ngas/testsuite/\n\t* gas/cfi-sframe/cfi-sframe-aarch64-1.d: Update expected output\n\tto include SFRAME_F_FDE_FUNC_START_PCREL instead of NONE.\n\t* gas/cfi-sframe/cfi-sframe-aarch64-2.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-aarch64-3.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-aarch64-4.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-1.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-10.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-11.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-2.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-3.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-4.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-5.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-6.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-7.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-8.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-common-9.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-x86_64-1.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-x86_64-2.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-x86_64-empty-1.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-x86_64-empty-2.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-x86_64-empty-3.d: Likewise.\n\t* gas/cfi-sframe/cfi-sframe-x86_64-empty-4.d: Likewise.\n\t* gas/cfi-sframe/common-empty-1.d: Likewise.\n\t* gas/cfi-sframe/common-empty-2.d: Likewise.\n\t* gas/cfi-sframe/common-empty-3.d: Likewise.\n\t* gas/scfi/x86_64/scfi-cfi-sections-1.d: Likewise.\n\t* gas/scfi/x86_64/scfi-dyn-stack-1.d: Likewise.\nld/testsuite/\n\t* ld-aarch64/sframe-simple-1.d: Update expected output to\n\tinclude SFRAME_F_FDE_FUNC_START_PCREL.\n\t* ld-x86-64/sframe-ibt-plt-1.d: Likewise.\n\t* ld-x86-64/sframe-plt-1.d: Likewise.\n\t* ld-x86-64/sframe-pltgot-1.d: Likewise.\n\t* ld-x86-64/sframe-pltgot-2.d: Likewise.\n\t* ld-x86-64/sframe-simple-1.d: Likewise.\n\nNaturally, the change of semantics for \u0027SFrame FDE function start address\u0027\nhas consequences on the implementation in libsframe.  As per the new\nsemantics:\n  - Function start address in the SFrame FDE (sfde_func_start_address)\n    is an offset from the FDE function start address field to the start\n    PC of the associated function.\n\nNote that, the libsframe library brings the SFrame section contents into\nits own memory to create a sframe_decoder_ctx object via sframe_decode\n().  Many internal and user-interfacing APIs then may use\nsframe_decoder_ctx object to interact and fulfill the work.\n\nIn context of changing semantics for sfde_func_start_address, following\nrelevant examples may help understand the impact:\n  - sframe_find_fre () finds a the SFrame stack trace data (SFrame FRE)\n    given a lookup offset (offset of lookup_pc from the start of SFrame\n    section).  Now that the sfde_func_start_address includes the\n    distance from the sfde_func_start_address field to the start of\n    SFrame section itself, the comparison checks of\n    sfde_func_start_address with the incoming lookup offset need\n    adjustment.\n  - Some internal functions (sframe_get_funcdesc_with_addr_internal ()\n    finds SFrame FDE by using binary seach comparing\n    sfde_func_start_address fields, etc.) need adjustments.\n  - sframe_encoder_write () sorts the SFrame FDEs before writing out\n    the SFrame data.  Sorting of SFrame FDE via the internal function\n    sframe_sort_funcdesc() needs adjustments: the new encoding of\n    sfde_func_start_address means the distances are not from the same\n    anchor, so cannot be sorted directly.\n\nThis patch takes the approach of adding a new internal function:\n  - sframe_decoder_get_secrel_func_start_addr (): This function returns\n    the offset of the start PC of the function from the start of SFrame\n    section, i.e., it gives a section-relative offset.\n\nAs the sframe_decoder_get_secrel_func_start_addr () API needs the value\nof the function index in the FDE list, another internal API needs\nsframe_fre_check_range_p () adjustments too.\n\nSorting the FDEs (via sframe_sort_funcdesc ()) is done by first bringing\nall offsets in sfde_func_start_address relative to start of SFrame\nsection, followed by sorting, and then readjusting the offsets accroding\nto the new position in the FDE list.\n\nlibsframe/\n\t* sframe.c (sframe_decoder_get_secrel_func_start_addr): New\n\tstatic function.\n        (sframe_fre_check_range_p): Adjust the interface a bit.\n\t(sframe_get_funcdesc_with_addr_internal): Use\n\tsframe_decoder_get_secrel_func_start_addr () when comparing\n\tsfde_func_start_address with user input offset.\n        (sframe_find_fre): Adopt the new semantics.\n        (sframe_sort_funcdesc): Likewise.\n\nFor the libsframe testsuite, use the new encoding for FDE func start\naddr: distance between the FDE sfde_func_start_address field and the\nstart PC of the function itself.\n\nUse SFRAME_F_FDE_FUNC_START_PCREL flag, though the sframe_encode ()\ninterface in libsframe applies no sanity checks for the encoding itself.\n\nlibsframe/testsuite/\n\t* libsframe.find/findfre-1.c: Adjust to use the new\n\tSFRAME_F_FDE_FUNC_START_PCREL specific encoding.\n\t* libsframe.find/findfunc-1.c: Likewise.\n\t* libsframe.find/plt-findfre-1.c: Likewise.\n\t* libsframe/testsuite/libsframe.decode/DATA2: Update data file\n\tdue to usage of new SFRAME_F_FDE_FUNC_START_PCREL flag.\n\t* libsframe/testsuite/libsframe.encode/encode-1.c: Use flag\n\tSFRAME_F_FDE_FUNC_START_PCREL.\n",
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