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Use macros from <machine/asm.h>. s/r15/sp/. Use cpp-safe label 

names.  Add comments.  Same object code is generated.
This commit is contained in:
uwe 2006-01-04 19:13:48 +00:00
parent 55ad9313a6
commit 8238ccbbf0
1 changed files with 25 additions and 33 deletions
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58
lib/libc/arch/sh3/gen/swapcontext.S
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@ -1,4 +1,4 @@
/* $NetBSD: swapcontext.S,v 1.3 2003/07/01 14:35:44 marcus Exp $ */
/* $NetBSD: swapcontext.S,v 1.4 2006/01/04 19:13:48 uwe Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
@ -38,42 +38,34 @@
#include <machine/asm.h>
#if defined(SYSLIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: swapcontext.S,v 1.3 2003/07/01 14:35:44 marcus Exp $")
RCSID("$NetBSD: swapcontext.S,v 1.4 2006/01/04 19:13:48 uwe Exp $")
#endif /* SYSLIBC_SCCS and not lint */
/*
* int
* swapcontext(ucontext_t * restrict oucp, ucontext_t * restrict ucp);
*/
ENTRY(swapcontext)
mov.l r5, @-r15
sts.l pr, @-r15
mov.l _L._getcontext, r0
#ifdef PIC
bsrf r0
#else
jsr @r0
#endif
mov.l r4, @-r15
2:
mov.l @r15+, r1
mov.l r5, @-sp
sts.l pr, @-sp
mov.l .L__getcontext, r0
1: CALL r0 /* _getcontext(oucp) */
mov.l r4, @-sp
mov.l @sp+, r1
tst r0, r0
bf 1f
mov.l @r15, r0
mov.l r0, @(36 + 1 * 4, r1) /* saved pc <- pr */
mov.l _L.setcontext, r2
#ifdef PIC
bsrf r2
#else
jsr @r2
#endif
mov.l @(4, r15), r4
1:
lds.l @r15+, pr
bf 3f /* return error from getcontext */
mov.l @sp, r0
mov.l r0, @(36 + 1 * 4, r1) /* _UC_MACHINE_PC(oucp) = pr */
mov.l .L_setcontext, r2
2: CALL r2 /* setcontext(ucp) */
mov.l @(4, sp), r4
/* if we get here, return error from setcontext */
3:
lds.l @sp+, pr
rts
add #4, r15
add #4, sp
.align 2
#ifdef PIC
_L._getcontext: .long _C_LABEL(_getcontext)-2b
_L.setcontext: .long _C_LABEL(setcontext)-1b
#else
_L._getcontext: .long _C_LABEL(_getcontext)
_L.setcontext: .long _C_LABEL(setcontext)
#endif
.L__getcontext: CALL_DATUM_LOCAL(_C_LABEL(_getcontext), 1b)
.L_setcontext: CALL_DATUM_LOCAL(_C_LABEL(setcontext), 2b)