[src/trunk]: src/sys/arch/arm/include/arm32 Shrink PUSHFRAMEINSVC by 4 more i...

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

details:   https://anonhg.NetBSD.org/src/rev/d2bd9ded4e35
branches:  trunk
changeset: 780634:d2bd9ded4e35
user:      matt <matt%NetBSD.org@localhost>
date:      Wed Aug 01 05:40:20 2012 +0000

description:
Shrink PUSHFRAMEINSVC by 4 more instructions.

diffstat:

 sys/arch/arm/include/arm32/frame.h |  13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)

diffs (27 lines):

diff -r 3ea0c0ac3422 -r d2bd9ded4e35 sys/arch/arm/include/arm32/frame.h
--- a/sys/arch/arm/include/arm32/frame.h        Wed Aug 01 04:20:04 2012 +0000
+++ b/sys/arch/arm/include/arm32/frame.h        Wed Aug 01 05:40:20 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: frame.h,v 1.27 2012/07/31 15:47:58 matt Exp $  */
+/*     $NetBSD: frame.h,v 1.28 2012/08/01 05:40:20 matt Exp $  */
 
 /*
  * Copyright (c) 1994-1997 Mark Brinicombe.
@@ -371,13 +371,10 @@
        mov     r1, sp;                 /* Save xxx32 sp */                \
        mrs     r3, spsr;               /* Save xxx32 spsr */              \
        SET_CPSR_MODE(r2, PSR_SVC32_MODE);                                 \
-       mov     r2, sp;                 /* Save SVC sp */                  \
-       tst     sp, #4;                 /* check for alignment */          \
-       subne   sp, sp, #4;             /* adjust if not aligned */        \
-       str     r0, [sp, #-4]!;         /* Push return address */          \
-       str     lr, [sp, #-4]!;         /* Push SVC lr */                  \
-       str     r2, [sp, #-4]!;         /* Push SVC sp */                  \
-       sub     sp, sp, #4;             /* Keep stack aligned */           \
+       bic     r2, sp, #7;             /* Align new SVC sp */             \
+       str     r0, [r2, #-4]!;         /* Push return address */          \
+       stmdb   r2!, {sp, lr};          /* Push SVC sp, lr */              \
+       sub     sp, r2, #4;             /* Keep stack aligned */           \
        msr     spsr_all, r3;           /* Restore correct spsr */         \
        ldmdb   r1, {r0-r3};            /* Restore 4 regs from xxx mode */ \
        sub     sp, sp, #(4*15);        /* Adjust the stack pointer */     \