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arm64/sme: Implement signal handling for ZT

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Add a new signal context type for ZT which is present in the signal frame
when ZA is enabled and ZT is supported by the system. In order to account
for the possible addition of further ZT registers in the future we make the
number of registers variable in the ABI, though currently the only possible
number is 1. We could just use a bare list head for the context since the
number of registers can be inferred from the size of the context but for
usability and future extensibility we define a header with the number of
registers and some reserved fields in it.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-arm64-sme2-v4-11-f2fa0aef982f@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown
2023-01-16 16:04:46 +00:00
committed by Catalin Marinas
parent 95fcec7132
commit ee072cf708
3 changed files with 124 additions and 3 deletions
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arch/arm64/include/uapi/asm/sigcontext.h
+19
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@@ -152,6 +152,14 @@ struct za_context {
__u16 __reserved[3];
};
#define ZT_MAGIC 0x5a544e01
struct zt_context {
struct _aarch64_ctx head;
__u16 nregs;
__u16 __reserved[3];
};
#endif /* !__ASSEMBLY__ */
#include <asm/sve_context.h>
@@ -304,4 +312,15 @@ struct za_context {
#define ZA_SIG_CONTEXT_SIZE(vq) \
(ZA_SIG_REGS_OFFSET + ZA_SIG_REGS_SIZE(vq))
#define ZT_SIG_REG_SIZE 512
#define ZT_SIG_REG_BYTES (ZT_SIG_REG_SIZE / 8)
#define ZT_SIG_REGS_OFFSET sizeof(struct zt_context)
#define ZT_SIG_REGS_SIZE(n) (ZT_SIG_REG_BYTES * n)
#define ZT_SIG_CONTEXT_SIZE(n) \
(sizeof(struct zt_context) + ZT_SIG_REGS_SIZE(n))
#endif /* _UAPI__ASM_SIGCONTEXT_H */