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D43307.1794464522.diff
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diff --git a/sys/arm64/arm64/exec_machdep.c b/sys/arm64/arm64/exec_machdep.c
--- a/sys/arm64/arm64/exec_machdep.c
+++ b/sys/arm64/arm64/exec_machdep.c
@@ -570,6 +570,7 @@
sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
{
struct arm64_reg_context ctx;
+ struct pcb *pcb;
ucontext_t uc;
vm_offset_t addr;
int error;
@@ -581,6 +582,7 @@
/* Read any register contexts we find */
if (uc.uc_mcontext.mc_ptr != 0) {
addr = uc.uc_mcontext.mc_ptr;
+ pcb = td->td_pcb;
done = false;
do {
@@ -588,6 +590,28 @@
return (EFAULT);
switch(ctx.ctx_id) {
+ case ARM64_CTX_SVE: {
+ struct sve_context sve_ctx;
+ size_t buf_size;
+
+ if (pcb->pcb_svesaved == NULL)
+ return (EINVAL);
+
+ buf_size = sve_buf_size(td);
+ /* Check the size is valid */
+ if (ctx.ctx_size !=
+ (sizeof(sve_ctx) + buf_size))
+ return (EINVAL);
+
+ memset(pcb->pcb_svesaved, 0,
+ sve_max_buf_size());
+
+ /* Copy the SVE registers from userspace */
+ if (copyin((void *)(addr + sizeof(sve_ctx)),
+ pcb->pcb_svesaved, buf_size) != 0)
+ return (EINVAL);
+ break;
+ }
case ARM64_CTX_END:
done = true;
break;
@@ -603,6 +627,13 @@
if (error != 0)
return (error);
+ /*
+ * Sync the VFP and SVE registers. To be backwards compatible we
+ * use the VFP registers to restore the lower bits of the SVE
+ * register it aliases.
+ */
+ vfp_to_sve_sync(td);
+
/* Restore signal mask. */
kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
@@ -628,9 +659,47 @@
return (true);
}
+static bool
+sendsig_ctx_sve(struct thread *td, vm_offset_t *addrp)
+{
+ struct sve_context ctx;
+ struct pcb *pcb;
+ size_t buf_size;
+ vm_offset_t ctx_addr;
+
+ pcb = td->td_pcb;
+ /* Do nothing if sve hasn't started */
+ if (pcb->pcb_svesaved == NULL)
+ return (true);
+
+ MPASS(pcb->pcb_svesaved != NULL);
+
+ buf_size = sve_buf_size(td);
+
+ /* Address for the full context */
+ *addrp -= sizeof(ctx) + buf_size;
+ ctx_addr = *addrp;
+
+ memset(&ctx, 0, sizeof(ctx));
+ ctx.sve_ctx.ctx_id = ARM64_CTX_SVE;
+ ctx.sve_ctx.ctx_size = sizeof(ctx) + buf_size;
+ ctx.sve_vector_len = pcb->pcb_sve_len;
+ ctx.sve_flags = 0;
+
+ /* Copy out the header and data */
+ if (copyout(&ctx, (void *)ctx_addr, sizeof(ctx)) != 0)
+ return (false);
+ if (copyout(pcb->pcb_svesaved, (void *)(ctx_addr + sizeof(ctx)),
+ buf_size) != 0)
+ return (false);
+
+ return (true);
+}
+
typedef bool(*ctx_func)(struct thread *, vm_offset_t *);
static const ctx_func ctx_funcs[] = {
sendsig_ctx_end, /* Must be first to end the linked list */
+ sendsig_ctx_sve,
NULL,
};
diff --git a/sys/arm64/include/ucontext.h b/sys/arm64/include/ucontext.h
--- a/sys/arm64/include/ucontext.h
+++ b/sys/arm64/include/ucontext.h
@@ -62,6 +62,14 @@
};
#define ARM64_CTX_END 0xa5a5a5a5
+#define ARM64_CTX_SVE 0x00657673
+
+struct sve_context {
+ struct arm64_reg_context sve_ctx;
+ __uint16_t sve_vector_len;
+ __uint16_t sve_flags;
+ __uint16_t sve_reserved[2];
+};
struct __mcontext {
struct gpregs mc_gpregs;

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