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Make sure to initialize GPR13/GPR2 appropriately for the Small Data Area 

pointer as described in the SVR4 PPC ABI.  Though GPR2 is defined by the
SVR4 PPC ABI as system-reserved, the EABI (Embedded API) changes its use
to be the Small Data Area 2 register (const small data).  Since powerpc
under NetBSD doesn't use R2 in the kernel (yet), support it as well.
This commit is contained in:
matt 2002-04-17 13:32:42 +00:00
parent 0c52280d47
commit 036d79bb12
1 changed files with 14 additions and 2 deletions
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16
lib/csu/powerpc/crt0.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: crt0.c,v 1.18 2000/06/14 22:52:50 cgd Exp $ */
/* $NetBSD: crt0.c,v 1.19 2002/04/17 13:32:42 matt Exp $ */
/*
* Copyright (c) 1997 Jason R. Thorpe.
@ -54,6 +54,18 @@ _start(argc, argv, envp, obj, cleanup, ps_strings)
{
char *namep;
/*
* Initialize the Small Data Area registers.
* _SDA_BASE is defined in the SVR4 ABI for PPC.
* _SDA2_BASE is defined in the E[mbedded] ABI for PPC.
*/
__asm( ".weak _SDA_BASE_;"
"addis 13,0,_SDA_BASE_@ha;"
"addi 13,13,_SDA_BASE_@l;"
".weak _SDA2_BASE_;"
"addis 2,0,_SDA2_BASE_@ha;"
"addi 2,2,_SDA2_BASE_@l" );
if ((namep = argv[0]) != NULL) { /* NULL ptr if argc = 0 */
if ((__progname = _strrchr(namep, '/')) == NULL)
__progname = namep;
@ -86,7 +98,7 @@ _start(argc, argv, envp, obj, cleanup, ps_strings)
* NOTE: Leave the RCS ID _after_ __start(), in case it gets placed in .text.
*/
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: crt0.c,v 1.18 2000/06/14 22:52:50 cgd Exp $");
__RCSID("$NetBSD: crt0.c,v 1.19 2002/04/17 13:32:42 matt Exp $");
#endif /* LIBC_SCCS and not lint */
#include "common.c"