linux-morello March 2026

linux-morello@op-lists.linaro.org

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[PATCH] kselftests/arm64: morello: Support R_MORELLO_FUNC_RELATIVE

by Jessica Clarke

Morello LLVM allows opting into distinguishing between function pointers (which may be interposed on by a compartmentalisation runtime) and code pointers (which always directly point to specific instructions, for cases like C++ landing pads and GNU C indirect goto). Supporting both relocations (which are equivalent for kselftest's non-compartmentalised purposes) will allow for Morello LLVM to make this opt-in behaviour always-on, reducing the number of ABI combinations. Signed-off-by: Jessica Clarke <jrtc27(a)jrtc27.com> --- .../selftests/arm64/morello/freestanding_init_globals.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/arm64/morello/freestanding_init_globals.c b/tools/testing/selftests/arm64/morello/freestanding_init_globals.c index 12eb0af97..2fa2aa643 100644 --- a/tools/testing/selftests/arm64/morello/freestanding_init_globals.c +++ b/tools/testing/selftests/arm64/morello/freestanding_init_globals.c @@ -38,6 +38,9 @@ #ifndef R_MORELLO_RELATIVE #define R_MORELLO_RELATIVE 59395 #endif +#ifndef R_MORELLO_FUNC_RELATIVE +#define R_MORELLO_FUNC_RELATIVE 59400 +#endif struct cap_reloc { size_t capability_location; @@ -181,7 +184,8 @@ void __morello_process_dynamic_relocs(void *auxv) for (reloc = rela_dyn_start; reloc < rela_dyn_end; ++reloc) { uintptr_t *reloc_addr, value; - if (reloc->r_info != R_MORELLO_RELATIVE) + if (reloc->r_info != R_MORELLO_RELATIVE && + reloc->r_info != R_MORELLO_FUNC_RELATIVE) continue; reloc_addr = (uintptr_t *)cheri_address_set(cap_rw, reloc->r_offset); value = morello_relative(0, cap_rx, cap_rw, reloc, reloc_addr); -- 2.34.1

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linux-morello March 2026