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nios2: fix r15 issue for gcc4

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The "-ffixed-r15" option doesn't work well for gcc4. Since we
don't use gp for small data with option "-G0", we can use gp
as global data pointer. This allows compiler to use r15. It
is necessary for gcc4 to work properly.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
This commit is contained in:
Thomas Chou
2010-05-21 11:08:03 +08:00
committed by Scott McNutt
parent 661ba14051
commit 0df01fd3d7
6 changed files with 20 additions and 18 deletions
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2
arch/nios2/include/asm/global_data.h
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@@ -48,6 +48,6 @@ typedef struct global_data {
#define GD_FLG_LOGINIT 0x00020 /* Log Buffer has been initialized */
#define GD_FLG_DISABLE_CONSOLE 0x00040 /* Disable console (in & out) */
#define DECLARE_GLOBAL_DATA_PTR register gd_t *gd asm ("r15")
#define DECLARE_GLOBAL_DATA_PTR register gd_t *gd asm ("gp")
#endif /* __ASM_NIOS2_GLOBALDATA_H_ */