[src/trunk]: src/sys/arch/aarch64/aarch64 The vectors allow for up to 0x80 by...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/af70cbccfb1f
branches:  trunk
changeset: 930652:af70cbccfb1f
user:      maxv <maxv%NetBSD.org@localhost>
date:      Sat Apr 11 09:02:04 2020 +0000

description:
The vectors allow for up to 0x80 bytes of instructions, but we've reached
this limit already, so implement the handler functions outside, and jump
to them. This allows to add instructions in the future.

Sent to ryo@ and skrll@.

diffstat:

 sys/arch/aarch64/aarch64/vectors.S |  114 ++++++++++++++++++++++++------------
 1 files changed, 75 insertions(+), 39 deletions(-)

diffs (140 lines):

diff -r 2ebfc57cee68 -r af70cbccfb1f sys/arch/aarch64/aarch64/vectors.S
--- a/sys/arch/aarch64/aarch64/vectors.S        Sat Apr 11 06:57:32 2020 +0000
+++ b/sys/arch/aarch64/aarch64/vectors.S        Sat Apr 11 09:02:04 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vectors.S,v 1.11 2020/02/12 07:02:08 skrll Exp $       */
+/*     $NetBSD: vectors.S,v 1.12 2020/04/11 09:02:04 maxv Exp $        */
 
 #include <aarch64/asm.h>
 #include "assym.h"
@@ -16,11 +16,12 @@
 #define        TRAP_FRAMESIZE  TF_SIZE
 #endif
 
-       /*
-        * vector_entry macro must be small enough to fit 0x80 bytes!
-        */
-       .macro  vector_entry, el, label, tpidr
-       .align 7        /* aligned 0x80 */
+/*
+ * Template for the handler functions.
+ */
+.macro vector_func, func, el, label, tpidr
+ENTRY_NP(\func)
+       .align 7        /* cacheline-aligned */
 
        .if \el == 1
        /* need to allocate stack on el1 */
@@ -88,44 +89,79 @@
        mov     x29, sp                 /* for backtrace */
 #endif
        b       \label
-       .endm
-
+END(\func)
+.endm
 
-       .align 11       /* vector table must be aligned 2048 */
-ENTRY_NP(el1_vectors)
+/*
+ * The vector_entry macro must be small enough to fit 0x80 bytes! We just jump
+ * into the proper function, so this constraint is always respected.
+ */
+.macro vector_entry, func
+       .align 7        /* aligned 0x80 */
+       b       \func
+.endm
+
 /*
- * Exception taken from current Exception Level with SP_EL0.
- * (These shouldn't happen)
+ * The functions.
  */
-       vector_entry    1, trap_el1t_sync
-       vector_entry    1, trap_el1t_irq
-       vector_entry    1, trap_el1t_fiq
-       vector_entry    1, trap_el1t_error
+vector_func    el1t_sync_handler,  1, trap_el1t_sync
+vector_func    el1t_irq_handler,   1, trap_el1t_irq
+vector_func    el1t_fiq_handler,   1, trap_el1t_fiq
+vector_func    el1t_error_handler, 1, trap_el1t_error
+
+vector_func    el1h_sync_handler,  1, trap_el1h_sync
+vector_func    el1h_intr_handler,  1, interrupt
+vector_func    el1h_fiq_handler,   1, trap_el1h_fiq
+vector_func    el1h_error_handler, 1, trap_el1h_error
+
+vector_func    el0_sync_handler,  0, trap_el0_sync
+vector_func    el0_intr_handler,  0, interrupt
+vector_func    el0_fiq_handler,   0, trap_el0_fiq
+vector_func    el0_error_handler, 0, trap_el0_error
+
+vector_func    el0_32sync_handler,  0, trap_el0_32sync, ro
+vector_func    el0_32intr_handler,  0, interrupt, ro
+vector_func    el0_32fiq_handler,   0, trap_el0_32fiq, ro
+vector_func    el0_32error_handler, 0, trap_el0_32error, ro
 
 /*
- * Exception taken from current Exception Level with SP_EL1.
- * There are entries for exceptions caused in EL1 (kernel exceptions).
- */
-       vector_entry    1, trap_el1h_sync
-       vector_entry    1, interrupt
-       vector_entry    1, trap_el1h_fiq
-       vector_entry    1, trap_el1h_error
-
-/*
- * Exception taken from lower Exception Level which is using AArch64
- * There are entries for exceptions caused in EL0 (native user exceptions).
+ * The vector table. Must be aligned to 2048.
  */
-       vector_entry    0, trap_el0_sync
-       vector_entry    0, interrupt
-       vector_entry    0, trap_el0_fiq
-       vector_entry    0, trap_el0_error
+       .align 11
+ENTRY_NP(el1_vectors)
+       /*
+        * Exception taken from current Exception Level with SP_EL0.
+        * (These shouldn't happen)
+        */
+       vector_entry    el1t_sync_handler
+       vector_entry    el1t_irq_handler
+       vector_entry    el1t_fiq_handler
+       vector_entry    el1t_error_handler
 
-/*
- * Exception taken from lower Exception Level which is using AArch32
- * There are entries for exceptions caused in EL0 (compat user exceptions).
- */
-       vector_entry    0, trap_el0_32sync, ro
-       vector_entry    0, interrupt, ro
-       vector_entry    0, trap_el0_32fiq, ro
-       vector_entry    0, trap_el0_32error, ro
+       /*
+        * Exception taken from current Exception Level with SP_EL1.
+        * There are entries for exceptions caused in EL1 (kernel exceptions).
+        */
+       vector_entry    el1h_sync_handler
+       vector_entry    el1h_intr_handler
+       vector_entry    el1h_fiq_handler
+       vector_entry    el1h_error_handler
+
+       /*
+        * Exception taken from lower Exception Level which is using AArch64.
+        * There are entries for exceptions caused in EL0 (native user exceptions).
+        */
+       vector_entry    el0_sync_handler
+       vector_entry    el0_intr_handler
+       vector_entry    el0_fiq_handler
+       vector_entry    el0_error_handler
+
+       /*
+        * Exception taken from lower Exception Level which is using AArch32.
+        * There are entries for exceptions caused in EL0 (compat user exceptions).
+        */
+       vector_entry    el0_32sync_handler
+       vector_entry    el0_32intr_handler
+       vector_entry    el0_32fiq_handler
+       vector_entry    el0_32error_handler
 END(el1_vectors)