[src/trunk]: src/sys/arch/aarch64/aarch64 - don't use ENTRY() for exception e...

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

details:   https://anonhg.NetBSD.org/src/rev/1f9012c4a424
branches:  trunk
changeset: 355944:1f9012c4a424
user:      nisimura <nisimura%NetBSD.org@localhost>
date:      Wed Aug 23 13:02:14 2017 +0000

description:
- don't use ENTRY() for exception entries.
- correct section definition.
- designate long pointer ldr.

diffstat:

 sys/arch/aarch64/aarch64/vectors.S |  57 +++++++++++++++++++++----------------
 1 files changed, 32 insertions(+), 25 deletions(-)

diffs (158 lines):

diff -r 859f954cadc1 -r 1f9012c4a424 sys/arch/aarch64/aarch64/vectors.S
--- a/sys/arch/aarch64/aarch64/vectors.S        Wed Aug 23 10:29:51 2017 +0000
+++ b/sys/arch/aarch64/aarch64/vectors.S        Wed Aug 23 13:02:14 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vectors.S,v 1.3 2017/08/22 18:35:09 nisimura Exp $ */
+/* $NetBSD: vectors.S,v 1.4 2017/08/23 13:02:14 nisimura Exp $ */
 
 #include <aarch64/asm.h>
 #include "assym.h"
@@ -18,6 +18,9 @@
        .macro  VECT_INVAL, el, cause, regsize = 64
        .align  7
        /* small enough to fit 32 instrunction slot */
+       .if \el == 1
+       sub     sp, sp, #TF_SIZE
+       .endif
        stp     x0, x1, [sp, #TF_X0]
        stp     x2, x3, [sp, #TF_X2]
        stp     x4, x5, [sp, #TF_X4]
@@ -37,7 +40,7 @@
        .if \el == 0
        mrs     x20, sp_el0
        .else
-       mrs     x20, sp_el1
+       mov     x20, sp
        .endif
        mrs     x21, elr_el1
        mrs     x22, spsr_el1
@@ -48,10 +51,11 @@
        mrs     x24, far_el1
        str     x23, [sp, #TF_ESR]
        str     x24, [sp, #TF_FAR]
-       adr     lr, exception_trap_exit
+       ldr     lr, =exception_trap_exit
        mov     x0, sp
        mov     x1, #\cause
        b       trap
+       /* !!! beware about remaining slot !!! */
        .endm
 
        .macro  exception_entry, el, regsize = 64
@@ -79,7 +83,7 @@
        mov     x29, xzr                /* fp pointed to user-space */
        mrs     x20, sp_el0
        .else
-       mrs     x20, sp_el1
+       mov     x20, sp
        .endif
        mrs     x21, elr_el1
        mrs     x22, spsr_el1
@@ -92,11 +96,12 @@
        str     x24, [sp, #TF_FAR]
        .endm
 
-       .pushsection ".entry.text", "ax"
+       .pushsection ".vectors", "ax"
+       .global _C_LABEL(el1_vectors)
        .p2align 11
-ENTRY(el1_vectors)
+_C_LABEL(el1_vectors):
 /*
- * A64 exception taken from current Exception Level with SP_EL1.
+ * Exception taken from current Exception Level with SP_EL1.
  * (These shouldn't happen)
  */
        VECT_INVAL      1, BAD_SYNC             /* Synchronous EL1t */
@@ -104,71 +109,73 @@
        VECT_INVAL      1, BAD_FIQ              /* FIQ EL1t */
        VECT_INVAL      1, BAD_ERROR            /* Error EL1t */
 /*
- * A64 exception taken from current Exception Level with SP.
- * EL1 (kernel exceptions)
+ * Exception taken from current Exception Level with SP.
+ * There are entries for exceptions caused in EL1 (kernel exceptions).
  */
        VECT_ENTRY      el1_sync                /* Synchronous EL1h */
        VECT_ENTRY      el1_irq                 /* IRQ EL1h */
        VECT_INVAL      1, BAD_FIQ              /* FIQ EL1h */
        VECT_INVAL      1, BAD_ERROR            /* Error EL1h */
 /*
- * A64 exception taken from lower Exception Level.
- * EL0 (native user exceptions)
+ * Exception taken from lower Exception Level which is using AArch64
+ * There are entries for exceptions caused in EL0 (native user exceptions).
  */
        VECT_ENTRY      el0_sync                /* Synchronous 64bit EL0 */
        VECT_ENTRY      el0_irq                 /* IRQ 64bit EL0 */
        VECT_INVAL      0, BAD_FIQ              /* FIQ 64bit EL0 */
        VECT_INVAL      0, BAD_ERROR            /* Error 64bit EL0 */
 /*
- * A32 exception taken from lower Exception Level.
- * EL0 (compat user exceptions)
+ * Exception taken from lower Exception Level which is using AArch32
+ * There are entries for exceptions caused in EL0 (compat user exceptions).
  */
        VECT_ENTRY      el0_32sync              /* Synchronous 32bit EL0 */
        VECT_ENTRY      el0_32irq               /* IRQ 32bit EL0 */
        VECT_INVAL      0, BAD_FIQ, 32          /* FIQ 32bit EL0 */
        VECT_INVAL      0, BAD_ERROR, 32        /* Error 32bit EL0 */
 
-ENTRY(el1_sync)
+_C_LABEL(el1_sync):
+       sub     sp, sp, #TF_SIZE
        exception_entry 1
-       adr     lr, exception_trap_exit
+       ldr     lr, =exception_trap_exit
        mov     x0, sp
        mov     x1, xzr
        b       trap
 END(el1_sync)
 
-ENTRY(el1_irq)
+_C_LABEL(el1_irq):
+       sub     sp, sp, #TF_SIZE
        exception_entry 1
-       adr     lr, exception_trap_exit
+       ldr     lr, =exception_trap_exit
        mov     x0, sp
        b       interrupt
 END(el1_irq)
 
-ENTRY(el0_sync)
+_C_LABEL(el0_sync):
        exception_entry 0
-       adr     lr, exception_trap_exit
+       ldr     lr, =exception_trap_exit
        mov     x0, sp
        mov     x1, xzr
        b       trap
 END(el0_sync)
 
-ENTRY(el0_irq)
+_C_LABEL(el0_irq):
        exception_entry 0
-       adr     lr, exception_trap_exit
+       ldr     lr, =exception_trap_exit
        mov     x0, sp
        b       interrupt
 END(el0_irq)
 
-ENTRY(el0_32sync)
+_C_LABEL(el0_32sync):
        exception_entry 0, 32
-       adr     lr, exception_trap_exit
+       ldr     lr, =exception_trap_exit
        mov     x0, sp
        mov     x1, xzr
        b       trap
 END(el0_32sync)
 
-ENTRY(el0_32irq)
+_C_LABEL(el0_32irq):
        exception_entry 0, 32
-       adr     lr, exception_trap_exit
+       ldr     lr, =exception_trap_exit
        mov     x0, sp
        b       interrupt
 END(el0_32irq)