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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/arch/arm64/include/uapi/asm/sigcontext.h
....@@ -77,6 +77,15 @@
7777 	__uint128_t vregs[32];
7878 };
7979 
80
+/*
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+ * Note: similarly to all other integer fields, each V-register is stored in an
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+ * endianness-dependent format, with the byte at offset i from the start of the
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+ * in-memory representation of the register value containing
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+ *
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+ *    bits [(7 + 8 * i) : (8 * i)] of the register on little-endian hosts; or
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+ *    bits [(127 - 8 * i) : (120 - 8 * i)] on big-endian hosts.
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+ */
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+
8089 /* ESR_EL1 context */
8190 #define ESR_MAGIC	0x45535201
8291 
....@@ -130,29 +139,30 @@
130139 
131140 #endif /* !__ASSEMBLY__ */
132141 
142
+#include <asm/sve_context.h>
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+
133144 /*
134145  * The SVE architecture leaves space for future expansion of the
135146  * vector length beyond its initial architectural limit of 2048 bits
136147  * (16 quadwords).
137148  *
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- * See linux/Documentation/arm64/sve.txt for a description of the VL/VQ
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+ * See linux/Documentation/arm64/sve.rst for a description of the VL/VQ
139150  * terminology.
140151  */
141
-#define SVE_VQ_BYTES		16	/* number of bytes per quadword */
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+#define SVE_VQ_BYTES		__SVE_VQ_BYTES	/* bytes per quadword */
142153 
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-#define SVE_VQ_MIN		1
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-#define SVE_VQ_MAX		512
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+#define SVE_VQ_MIN		__SVE_VQ_MIN
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+#define SVE_VQ_MAX		__SVE_VQ_MAX
145156 
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-#define SVE_VL_MIN		(SVE_VQ_MIN * SVE_VQ_BYTES)
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-#define SVE_VL_MAX		(SVE_VQ_MAX * SVE_VQ_BYTES)
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+#define SVE_VL_MIN		__SVE_VL_MIN
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+#define SVE_VL_MAX		__SVE_VL_MAX
148159 
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-#define SVE_NUM_ZREGS		32
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-#define SVE_NUM_PREGS		16
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+#define SVE_NUM_ZREGS		__SVE_NUM_ZREGS
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+#define SVE_NUM_PREGS		__SVE_NUM_PREGS
151162 
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-#define sve_vl_valid(vl) \
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-	((vl) % SVE_VQ_BYTES == 0 && (vl) >= SVE_VL_MIN && (vl) <= SVE_VL_MAX)
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-#define sve_vq_from_vl(vl)	((vl) / SVE_VQ_BYTES)
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-#define sve_vl_from_vq(vq)	((vq) * SVE_VQ_BYTES)
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+#define sve_vl_valid(vl)	__sve_vl_valid(vl)
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+#define sve_vq_from_vl(vl)	__sve_vq_from_vl(vl)
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+#define sve_vl_from_vq(vq)	__sve_vl_from_vq(vq)
156166 
157167 /*
158168  * If the SVE registers are currently live for the thread at signal delivery,
....@@ -169,7 +179,7 @@
169179  * The same convention applies when returning from a signal: a caller
170180  * will need to remove or resize the sve_context block if it wants to
171181  * make the SVE registers live when they were previously non-live or
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- * vice-versa.  This may require the the caller to allocate fresh
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+ * vice-versa.  This may require the caller to allocate fresh
173183  * memory and/or move other context blocks in the signal frame.
174184  *
175185  * Changing the vector length during signal return is not permitted:
....@@ -203,36 +213,40 @@
203213  *	FFR	uint16_t[vq]			first-fault status register
204214  *
205215  * Additional data might be appended in the future.
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+ *
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+ * Unlike vregs[] in fpsimd_context, each SVE scalable register (Z-, P- or FFR)
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+ * is encoded in memory in an endianness-invariant format, with the byte at
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+ * offset i from the start of the in-memory representation containing bits
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+ * [(7 + 8 * i) : (8 * i)] of the register value.
206221  */
207222 
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-#define SVE_SIG_ZREG_SIZE(vq)	((__u32)(vq) * SVE_VQ_BYTES)
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-#define SVE_SIG_PREG_SIZE(vq)	((__u32)(vq) * (SVE_VQ_BYTES / 8))
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-#define SVE_SIG_FFR_SIZE(vq)	SVE_SIG_PREG_SIZE(vq)
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+#define SVE_SIG_ZREG_SIZE(vq)	__SVE_ZREG_SIZE(vq)
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+#define SVE_SIG_PREG_SIZE(vq)	__SVE_PREG_SIZE(vq)
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+#define SVE_SIG_FFR_SIZE(vq)	__SVE_FFR_SIZE(vq)
211226 
212227 #define SVE_SIG_REGS_OFFSET					\
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-	((sizeof(struct sve_context) + (SVE_VQ_BYTES - 1))	\
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-		/ SVE_VQ_BYTES * SVE_VQ_BYTES)
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+	((sizeof(struct sve_context) + (__SVE_VQ_BYTES - 1))	\
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+		/ __SVE_VQ_BYTES * __SVE_VQ_BYTES)
215230 
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-#define SVE_SIG_ZREGS_OFFSET	SVE_SIG_REGS_OFFSET
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+#define SVE_SIG_ZREGS_OFFSET \
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+		(SVE_SIG_REGS_OFFSET + __SVE_ZREGS_OFFSET)
217233 #define SVE_SIG_ZREG_OFFSET(vq, n) \
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-	(SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREG_SIZE(vq) * (n))
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-#define SVE_SIG_ZREGS_SIZE(vq) \
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-	(SVE_SIG_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_SIG_ZREGS_OFFSET)
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+		(SVE_SIG_REGS_OFFSET + __SVE_ZREG_OFFSET(vq, n))
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+#define SVE_SIG_ZREGS_SIZE(vq) __SVE_ZREGS_SIZE(vq)
221236 
222237 #define SVE_SIG_PREGS_OFFSET(vq) \
223
-	(SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREGS_SIZE(vq))
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+		(SVE_SIG_REGS_OFFSET + __SVE_PREGS_OFFSET(vq))
224239 #define SVE_SIG_PREG_OFFSET(vq, n) \
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-	(SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREG_SIZE(vq) * (n))
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-#define SVE_SIG_PREGS_SIZE(vq) \
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-	(SVE_SIG_PREG_OFFSET(vq, SVE_NUM_PREGS) - SVE_SIG_PREGS_OFFSET(vq))
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+		(SVE_SIG_REGS_OFFSET + __SVE_PREG_OFFSET(vq, n))
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+#define SVE_SIG_PREGS_SIZE(vq) __SVE_PREGS_SIZE(vq)
228242 
229243 #define SVE_SIG_FFR_OFFSET(vq) \
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-	(SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREGS_SIZE(vq))
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+		(SVE_SIG_REGS_OFFSET + __SVE_FFR_OFFSET(vq))
231245 
232246 #define SVE_SIG_REGS_SIZE(vq) \
233
-	(SVE_SIG_FFR_OFFSET(vq) + SVE_SIG_FFR_SIZE(vq) - SVE_SIG_REGS_OFFSET)
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+		(__SVE_FFR_OFFSET(vq) + __SVE_FFR_SIZE(vq))
234248 
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-#define SVE_SIG_CONTEXT_SIZE(vq) (SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq))
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-
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+#define SVE_SIG_CONTEXT_SIZE(vq) \
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+		(SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq))
237251 
238252 #endif /* _UAPI__ASM_SIGCONTEXT_H */