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Faster/shorter way of aligning something.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15909 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2006-01-11 14:14:50 +00:00
parent b7ba8a182f
commit b33f1804ea
1 changed files with 2 additions and 4 deletions
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6
src/system/kernel/arch/ppc/arch_exceptions.S
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@ -197,8 +197,7 @@ FUNCTION(ppc_exception_tail):
mtcrf 0xff, %r0
/* align r1 to 8 bytes, so the iframe will be aligned too */
li %r0, 0xfffffff8
and %r1, %r1, %r0
rlwinm %r1, %r1, 0, 0, 28
/* save the registers */
bl __save_regs
@ -210,8 +209,7 @@ FUNCTION(ppc_exception_tail):
/* adjust the stack pointer for ABI compatibility */
subi %r1, %r1, 8 /* make sure there's space for the previous
frame pointer and the return address */
li %r2, 0xfffffff0
and %r1, %r1, %r2 /* 16 byte align the stack pointer */
rlwinm %r1, %r1, 0, 0, 27 /* 16 byte align the stack pointer */
li %r0, 0
stw %r0, 0(%r1) /* previous frame pointer: NULL */
/* 4(%r1) is room for the return address to be filled in by the