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[MIPS] Optimize and cleanup get_saved_sp, set_saved_sp

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If CONFIG_BUILD_ELF64 was not selected and gcc had -msym32 option
(i.e. 4.0 or newer), there is no point to use %highest, %higher for
kernel symbols.

This patch also fixes 64-bit SMTC version of get_saved_sp() which is
broken but harmless since there is no such CPUs for now.

A bonus is set_saved_sp() and SMP version of get_saved_sp() are more
readable now.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2006-10-10 22:46:52 +09:00 committed by Ralf Baechle
parent dff9262ed1
commit 9b95e629ea
1 changed files with 19 additions and 45 deletions

64
include/asm-mips/stackframe.h
View File

@ -59,69 +59,43 @@
.endm .endm
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
#ifdef CONFIG_MIPS_MT_SMTC
#define PTEBASE_SHIFT 19 /* TCBIND */
#else
#define PTEBASE_SHIFT 23 /* CONTEXT */
#endif
.macro get_saved_sp /* SMP variation */ .macro get_saved_sp /* SMP variation */
#ifdef CONFIG_32BIT
#ifdef CONFIG_MIPS_MT_SMTC #ifdef CONFIG_MIPS_MT_SMTC
.set mips32 mfc0 k0, CP0_TCBIND
mfc0 k0, CP0_TCBIND;
.set mips0
lui k1, %hi(kernelsp)
srl k0, k0, 19
/* No need to shift down and up to clear bits 0-1 */
#else #else
mfc0 k0, CP0_CONTEXT MFC0 k0, CP0_CONTEXT
lui k1, %hi(kernelsp)
srl k0, k0, 23
#endif #endif
addu k1, k0 #if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
LONG_L k1, %lo(kernelsp)(k1) lui k1, %highest(kernelsp)
#endif daddiu k1, %higher(kernelsp)
#ifdef CONFIG_64BIT dsll k1, 16
#ifdef CONFIG_MIPS_MT_SMTC daddiu k1, %hi(kernelsp)
.set mips64 dsll k1, 16
mfc0 k0, CP0_TCBIND;
.set mips0
lui k0, %highest(kernelsp)
dsrl k1, 19
/* No need to shift down and up to clear bits 0-2 */
#else #else
MFC0 k1, CP0_CONTEXT lui k1, %hi(kernelsp)
lui k0, %highest(kernelsp) #endif
dsrl k1, 23 LONG_SRL k0, PTEBASE_SHIFT
daddiu k0, %higher(kernelsp) LONG_ADDU k1, k0
dsll k0, k0, 16
daddiu k0, %hi(kernelsp)
dsll k0, k0, 16
#endif /* CONFIG_MIPS_MT_SMTC */
daddu k1, k1, k0
LONG_L k1, %lo(kernelsp)(k1) LONG_L k1, %lo(kernelsp)(k1)
#endif /* CONFIG_64BIT */
.endm .endm
.macro set_saved_sp stackp temp temp2 .macro set_saved_sp stackp temp temp2
#ifdef CONFIG_32BIT
#ifdef CONFIG_MIPS_MT_SMTC #ifdef CONFIG_MIPS_MT_SMTC
mfc0 \temp, CP0_TCBIND mfc0 \temp, CP0_TCBIND
srl \temp, 19
#else
mfc0 \temp, CP0_CONTEXT
srl \temp, 23
#endif
#endif
#ifdef CONFIG_64BIT
#ifdef CONFIG_MIPS_MT_SMTC
mfc0 \temp, CP0_TCBIND
dsrl \temp, 19
#else #else
MFC0 \temp, CP0_CONTEXT MFC0 \temp, CP0_CONTEXT
dsrl \temp, 23
#endif
#endif #endif
LONG_SRL \temp, PTEBASE_SHIFT
LONG_S \stackp, kernelsp(\temp) LONG_S \stackp, kernelsp(\temp)
.endm .endm
#else #else
.macro get_saved_sp /* Uniprocessor variation */ .macro get_saved_sp /* Uniprocessor variation */
#ifdef CONFIG_64BIT #if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
lui k1, %highest(kernelsp) lui k1, %highest(kernelsp)
daddiu k1, %higher(kernelsp) daddiu k1, %higher(kernelsp)
dsll k1, k1, 16 dsll k1, k1, 16