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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-10-10 22:46:52 +0900
committerRalf Baechle <ralf@linux-mips.org>2006-10-11 19:30:59 +0100
commit9b95e629eab59ee140fe2b17bbd7fea6821c6085 (patch)
treecda9a07874bd1c7ba3254addbff24bcc7f91ac7d /include/asm-mips/stackframe.h
parentdff9262ed1491a1e531dc56e687605b5e4cd488d (diff)
downloadop-kernel-dev-9b95e629eab59ee140fe2b17bbd7fea6821c6085.zip
op-kernel-dev-9b95e629eab59ee140fe2b17bbd7fea6821c6085.tar.gz
[MIPS] Optimize and cleanup get_saved_sp, set_saved_sp
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>
Diffstat (limited to 'include/asm-mips/stackframe.h')
-rw-r--r--include/asm-mips/stackframe.h64
1 files changed, 19 insertions, 45 deletions
diff --git a/include/asm-mips/stackframe.h b/include/asm-mips/stackframe.h
index 158a4cd..1fae5dc 100644
--- a/include/asm-mips/stackframe.h
+++ b/include/asm-mips/stackframe.h
@@ -59,69 +59,43 @@
.endm
#ifdef CONFIG_SMP
- .macro get_saved_sp /* SMP variation */
-#ifdef CONFIG_32BIT
#ifdef CONFIG_MIPS_MT_SMTC
- .set mips32
- 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 */
+#define PTEBASE_SHIFT 19 /* TCBIND */
#else
- mfc0 k0, CP0_CONTEXT
- lui k1, %hi(kernelsp)
- srl k0, k0, 23
-#endif
- addu k1, k0
- LONG_L k1, %lo(kernelsp)(k1)
+#define PTEBASE_SHIFT 23 /* CONTEXT */
#endif
-#ifdef CONFIG_64BIT
+ .macro get_saved_sp /* SMP variation */
#ifdef CONFIG_MIPS_MT_SMTC
- .set mips64
- 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 */
+ mfc0 k0, CP0_TCBIND
#else
- MFC0 k1, CP0_CONTEXT
- lui k0, %highest(kernelsp)
- dsrl k1, 23
- daddiu k0, %higher(kernelsp)
- dsll k0, k0, 16
- daddiu k0, %hi(kernelsp)
- dsll k0, k0, 16
-#endif /* CONFIG_MIPS_MT_SMTC */
- daddu k1, k1, k0
+ MFC0 k0, CP0_CONTEXT
+#endif
+#if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
+ lui k1, %highest(kernelsp)
+ daddiu k1, %higher(kernelsp)
+ dsll k1, 16
+ daddiu k1, %hi(kernelsp)
+ dsll k1, 16
+#else
+ lui k1, %hi(kernelsp)
+#endif
+ LONG_SRL k0, PTEBASE_SHIFT
+ LONG_ADDU k1, k0
LONG_L k1, %lo(kernelsp)(k1)
-#endif /* CONFIG_64BIT */
.endm
.macro set_saved_sp stackp temp temp2
-#ifdef CONFIG_32BIT
-#ifdef CONFIG_MIPS_MT_SMTC
- 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
MFC0 \temp, CP0_CONTEXT
- dsrl \temp, 23
-#endif
#endif
+ LONG_SRL \temp, PTEBASE_SHIFT
LONG_S \stackp, kernelsp(\temp)
.endm
#else
.macro get_saved_sp /* Uniprocessor variation */
-#ifdef CONFIG_64BIT
+#if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
lui k1, %highest(kernelsp)
daddiu k1, %higher(kernelsp)
dsll k1, k1, 16
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