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Ip=[4.158.2.129]; Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB5PEPF00014B9A.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR08MB5567 X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org This series fixes a GDB inferior-call issue exposed by malloc being a GNU IFUNC in glibc on AArch64. The underlying problem is not AArch64-specific: it can affect any inferior helper found through find_function_in_inferior's minimal-symbol fallback when that helper is a GNU IFUNC. GDB calls find_function_in_inferior ("malloc") when expression evaluation needs to allocate memory in the inferior, for example for string literal arguments. In the minimal-symbol fallback, GDB created a synthetic ordinary function pointer from the minimal symbol address. If the symbol was a GNU IFUNC, this lost the IFUNC marker, so call_function_by_hand did not resolve the symbol before calling it. Patch 1 checks the minimal symbol kind directly and propagates the GNU IFUNC marker to the synthetic function type for mst_text_gnu_ifunc and mst_data_gnu_ifunc symbols. The existing fallback address and return type are unchanged. Patch 2 fixes the follow-on return-type issue after IFUNC resolution. When the resolved target type, or the type inferred from the resolver return type, does not provide a usable return type, find_function_addr now keeps the original function type's return type. This preserves the synthetic fallback return type used by find_function_in_inferior ("malloc"). The tests add an internal inferior-call case using an IFUNC malloc and run it through the existing gdb.base/gnu-ifunc.exp matrix for resolver attr, resolver debug info, and resolved-target debug info. Changes since v2: * Rework the minimal-symbol fallback to check the minimal symbol kind directly as suggested by Simon. * Add coverage for both debug and no-debug IFUNC malloc variants by using the existing framework. * Preserve the original IFUNC return type when the resolved target type is unknown. Muhammad Kamran (2): gdb: Preserve IFUNC marker when finding inferior functions gdb: Keep original IFUNC return type when target type is unknown gdb/infcall.c | 12 +++- .../gdb.base/gnu-ifunc-inferior-call-final.c | 27 ++++++++ .../gnu-ifunc-inferior-call-resolver.c | 43 +++++++++++++ .../gdb.base/gnu-ifunc-inferior-call.c | 37 +++++++++++ gdb/testsuite/gdb.base/gnu-ifunc.exp | 61 +++++++++++++++++++ gdb/valops.c | 5 ++ 6 files changed, 183 insertions(+), 2 deletions(-) create mode 100644 gdb/testsuite/gdb.base/gnu-ifunc-inferior-call-final.c create mode 100644 gdb/testsuite/gdb.base/gnu-ifunc-inferior-call-resolver.c create mode 100644 gdb/testsuite/gdb.base/gnu-ifunc-inferior-call.c -- 2.43.0