)]}' { "commit": "c4fea3905617af89d1ad87319893e250f5b72dd6", "tree": "323c82e60a01a8bcb0ad8ffa4eaafeb8b688534e", "parents": [ "afc5cca0d4016f09f0d7e2683d5a920c7ecf9397" ], "author": { "name": "Amilendra Kodithuwakku", "email": "Amilendra.Kodithuwakku@arm.com", "time": "Wed Jun 21 12:48:33 2023 +0100" }, "committer": { "name": "Amilendra Kodithuwakku", "email": "Amilendra.Kodithuwakku@arm.com", "time": "Wed Jun 21 14:47:34 2023 +0100" }, "message": "[LLD][ELF] Cortex-M Security Extensions (CMSE) Support\n\nThis commit provides linker support for Cortex-M Security Extensions (CMSE).\nThe specification for this feature can be found in ARM v8-M Security Extensions:\nRequirements on Development Tools.\n\nThe linker synthesizes a security gateway veneer in a special section;\n`.gnu.sgstubs`, when it finds non-local symbols `__acle_se_\u003centry\u003e` and `\u003centry\u003e`,\ndefined relative to the same text section and having the same address. The\naddress of `\u003centry\u003e` is retargeted to the starting address of the\nlinker-synthesized security gateway veneer in section `.gnu.sgstubs`.\n\nIn summary, the linker translates input:\n\n```\n .text\n entry:\n __acle_se_entry:\n [entry_code]\n\n```\ninto:\n\n```\n .section .gnu.sgstubs\n entry:\n SG\n B.W __acle_se_entry\n\n .text\n __acle_se_entry:\n [entry_code]\n```\n\nIf addresses of `__acle_se_\u003centry\u003e` and `\u003centry\u003e` are not equal, the linker\nconsiders that `\u003centry\u003e` already defines a secure gateway veneer so does not\nsynthesize one.\n\nIf `--out-implib\u003d\u003cout.lib\u003e` is specified, the linker writes the list of secure\ngateway veneers into a CMSE import library `\u003cout.lib\u003e`. The CMSE import library\nwill have 3 sections: `.symtab`, `.strtab`, `.shstrtab`. For every secure gateway\nveneer \u003centry\u003e at address `\u003caddr\u003e`, `.symtab` contains a `SHN_ABS` symbol `\u003centry\u003e` with\nvalue `\u003caddr\u003e`.\n\nIf `--in-implib\u003d\u003cin.lib\u003e` is specified, the linker reads the existing CMSE import\nlibrary `\u003cin.lib\u003e` and preserves the entry function addresses in the resulting\nexecutable and new import library.\n\nReviewed By: MaskRay, peter.smith\n\nDifferential Revision: https://reviews.llvm.org/D139092\n", "tree_diff": [ { "type": "modify", "old_id": "79635a22df4ec93cbd1dc383a014961e18a44c38", "old_mode": 33188, "old_path": "lld/ELF/Arch/ARM.cpp", "new_id": "93e999fd2df11d3eec3dbf8d57b41051d3a063b7", "new_mode": 33188, "new_path": "lld/ELF/Arch/ARM.cpp" }, { "type": "modify", "old_id": "956530098c0f18e216bd5aecfbc04bd6c59e1041", "old_mode": 33188, "old_path": "lld/ELF/Config.h", "new_id": "699c9d31e9433922a183d28cf8c435d46c65e0cc", "new_mode": 33188, "new_path": "lld/ELF/Config.h" }, { "type": 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