Message ID | 7a4ebbee1b5d902aa1fba853d5d1735b2316452b.1701967183.git.szabolcs.nagy@arm.com |
---|---|
State | New |
Headers | show
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libgcc: aarch64: Add SME runtime
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diff --git a/libgcc/config/aarch64/__arm_za_disable.S b/libgcc/config/aarch64/__arm_za_disable.S index 7a888a98d49..f61d4255fdc 100644 --- a/libgcc/config/aarch64/__arm_za_disable.S +++ b/libgcc/config/aarch64/__arm_za_disable.S @@ -64,3 +64,8 @@ ENTRY (__arm_za_disable) L(end): ret END (__arm_za_disable) + +/* Hidden alias used by the unwinder. */ +.global __libgcc_arm_za_disable +.hidden __libgcc_arm_za_disable +.set __libgcc_arm_za_disable, __arm_za_disable diff --git a/libgcc/config/aarch64/aarch64-unwind.h b/libgcc/config/aarch64/aarch64-unwind.h index d669edd671b..9fe6c8f61c3 100644 --- a/libgcc/config/aarch64/aarch64-unwind.h +++ b/libgcc/config/aarch64/aarch64-unwind.h @@ -78,4 +78,20 @@ aarch64_demangle_return_addr (struct _Unwind_Context *context, return addr; } +/* SME runtime function local to libgcc, streaming compatible + and preserves more registers than the base PCS requires, but + we don't rely on that here. */ +__attribute__ ((visibility ("hidden"))) +void __libgcc_arm_za_disable (void); + +/* Disable the SME ZA state in case an unwound frame used the ZA + lazy saving scheme. */ +#undef _Unwind_Frames_Extra +#define _Unwind_Frames_Extra(x) \ + do \ + { \ + __libgcc_arm_za_disable (); \ + } \ + while (0) + #endif /* defined AARCH64_UNWIND_H && defined __ILP32__ */