This is a workaround that emits a BTI after the function label if that is followed by a patch area. We try to remove the BTI that follows the patch area (this may fail e.g. if the first instruction is a PACIASP). So before this commit -fpatchable-function-entry=3,1 with bti generates .section __patchable_function_entries .8byte .LPFE .text .LPFE: nop foo: nop nop bti c // or paciasp ... and after this commit .section __patchable_function_entries .8byte .LPFE .text .LPFE: nop foo: bti c nop nop // may be paciasp ... and with -fpatchable-function-entry=1 (M=0) the code now is foo: bti c .section __patchable_function_entries .8byte .LPFE .text .LPFE: nop // may be paciasp ... There is a new bti insn in the middle of the patchable area users need to be aware of unless M=0 (patch area is after the new bti) or M=N (patch area is before the label, no new bti). Note: bti is not added to all functions consistently (it can be turned off per function using a target attribute or the compiler may detect that the function is never called indirectly), so if bti is inserted in the middle of a patch area then user code needs to deal with detecting it. Tested on aarch64-none-linux-gnu. gcc/ChangeLog: PR target/92424 * config/aarch64/aarch64.c (aarch64_declare_function_name): Set cfun->machine->label_is_assembled. (aarch64_print_patchable_function_entry): New. (TARGET_ASM_PRINT_PATCHABLE_FUNCTION_ENTRY): Define. * config/aarch64/aarch64.h (struct machine_function): New field, label_is_assembled. gcc/testsuite/ChangeLog: PR target/92424 * gcc.target/aarch64/pr92424-1.c: New test. * gcc.target/aarch64/pr92424-2.c: New test. * gcc.target/aarch64/pr92424-3.c: New test.
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