Hi.
Can this be related to this issue?
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292195
"arm64: panic on coredump with sve instructions"
Regards,
Ronald.
Van: Andrew Turner <[email protected]>
Datum: dinsdag, 6 januari 2026 12:04
Aan: [email protected], [email protected],
[email protected]
Onderwerp: git: a9e77eb7016d - main - arm64: Correctly align the SVE signal
context
The branch main has been updated by andrew:
URL:
https://cgit.FreeBSD.org/src/commit/?id=a9e77eb7016df70723c208fc09fbd01ec23a732d
commit a9e77eb7016df70723c208fc09fbd01ec23a732d
Author: Andrew Turner <[email protected]>
AuthorDate: 2026-01-06 10:35:55 +0000
Commit: Andrew Turner <[email protected]>
CommitDate: 2026-01-06 10:36:37 +0000
arm64: Correctly align the SVE signal context
The SVE signal context needs to be correctly aligned. Fix this by
creating a new macro to calculate the needed size to provide this
alignment, and use it when setting and checking the saved SVE signal
context.
Reported by: cperciva
Reviewed by: cperciva, markj
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D54396
---
sys/arm64/arm64/exec_machdep.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/sys/arm64/arm64/exec_machdep.c b/sys/arm64/arm64/exec_machdep.c
index 7c50dc93fdb4..207e10ede96c 100644
--- a/sys/arm64/arm64/exec_machdep.c
+++ b/sys/arm64/arm64/exec_machdep.c
@@ -60,6 +60,10 @@
#include <machine/vfp.h>
#endif
+#define CTX_SIZE_SVE(buf_size) \
+ roundup2(sizeof(struct sve_context) + (buf_size), \
+ _Alignof(struct sve_context))
+
_Static_assert(sizeof(mcontext_t) == 880, "mcontext_t size incorrect");
_Static_assert(sizeof(ucontext_t) == 960, "ucontext_t size incorrect");
_Static_assert(sizeof(siginfo_t) == 80, "siginfo_t size incorrect");
@@ -585,8 +589,7 @@ set_mcontext(struct thread *td, mcontext_t *mcp)
buf_size = sve_buf_size(td);
/* Check the size is valid */
- if (ctx.ctx_size !=
- (sizeof(sve_ctx) + buf_size))
+ if (ctx.ctx_size != CTX_SIZE_SVE(buf_size))
return (EINVAL);
memset(pcb->pcb_svesaved, 0,
@@ -729,7 +732,7 @@ sendsig_ctx_sve(struct thread *td, vm_offset_t *addrp)
{
struct sve_context ctx;
struct pcb *pcb;
- size_t buf_size;
+ size_t buf_size, ctx_size;
vm_offset_t ctx_addr;
pcb = td->td_pcb;
@@ -740,14 +743,15 @@ sendsig_ctx_sve(struct thread *td, vm_offset_t *addrp)
MPASS(pcb->pcb_svesaved != NULL);
buf_size = sve_buf_size(td);
+ ctx_size = CTX_SIZE_SVE(buf_size);
/* Address for the full context */
- *addrp -= sizeof(ctx) + buf_size;
+ *addrp -= ctx_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_ctx.ctx_size = ctx_size;
ctx.sve_vector_len = pcb->pcb_sve_len;
ctx.sve_flags = 0;
