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PPC: Use r2 instead of r29 as global data pointer

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R29 was an unlucky choice as with recent toolchains (gcc-4.2.x) gcc
will refuse to use load/store multiple insns; instead, it issues a
list of simple load/store instructions upon function entry and exit,
resulting in bigger code size, which in turn makes the build for a
few boards fail.

Use r2 instead.

Signed-off-by: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Wolfgang Denk
2008-02-14 22:43:22 +01:00
parent 3c234efa69
commit e7670f6c1e
19 changed files with 24 additions and 23 deletions
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2
include/asm-ppc/global_data.h
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@@ -163,7 +163,7 @@ typedef struct global_data {
#define GD_FLG_SILENT 0x00004 /* Silent mode */
#if 1
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r29")
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r2")
#else /* We could use plain global data, but the resulting code is bigger */
#define XTRN_DECLARE_GLOBAL_DATA_PTR extern
#define DECLARE_GLOBAL_DATA_PTR XTRN_DECLARE_GLOBAL_DATA_PTR \