mirror of
https://github.com/openwrt/openwrt.git
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227 lines
7.6 KiB
Diff
227 lines
7.6 KiB
Diff
GCC 4.4.x looks to be adding support for generating out-of-line register
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saves/restores based on:
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http://gcc.gnu.org/ml/gcc-patches/2008-04/msg01678.html
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This breaks the kernel build as we'd have to link with libgcc to get the
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implementation of the register save/restores.
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To workaround this issue, we just stole the save/restore code from gcc
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and simplified it down for our needs (integer only). We only do this if
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PPC32 as gcc makes believe the linker on ppc64 will deal with this and
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only if CONFIG_CC_OPTIMIZE_FOR_SIZE is set (thus -Os).
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Signed-off-by: Kumar Gala <[EMAIL PROTECTED]>
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---
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If someone using cutting edge toolchains for ppc64 could test and make
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sure if we enable CONFIG_CC_OPTIMIZE_FOR_SIZE things work that would be
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nice.
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- k
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arch/powerpc/kernel/misc_32.S | 77 +++++++++++++++++++++++++++
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arch/powerpc/kernel/ppc_ksyms.c | 111 +++++++++++++++++++++++++++++++++++++++
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2 files changed, 188 insertions(+), 0 deletions(-)
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--- a/arch/powerpc/kernel/misc_32.S
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+++ b/arch/powerpc/kernel/misc_32.S
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@@ -802,3 +802,80 @@ relocate_new_kernel_end:
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relocate_new_kernel_size:
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.long relocate_new_kernel_end - relocate_new_kernel
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#endif
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+
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+#if defined(CONFIG_PPC32) && defined(CONFIG_CC_OPTIMIZE_FOR_SIZE)
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+/* Routines for saving integer registers, called by the compiler. */
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+/* Called with r11 pointing to the stack header word of the caller of the */
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+/* function, just beyond the end of the integer save area. */
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+
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+_GLOBAL(_savegpr_14) stw 14,-72(11) /* save gp registers */
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+_GLOBAL(_savegpr_15) stw 15,-68(11)
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+_GLOBAL(_savegpr_16) stw 16,-64(11)
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+_GLOBAL(_savegpr_17) stw 17,-60(11)
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+_GLOBAL(_savegpr_18) stw 18,-56(11)
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+_GLOBAL(_savegpr_19) stw 19,-52(11)
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+_GLOBAL(_savegpr_20) stw 20,-48(11)
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+_GLOBAL(_savegpr_21) stw 21,-44(11)
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+_GLOBAL(_savegpr_22) stw 22,-40(11)
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+_GLOBAL(_savegpr_23) stw 23,-36(11)
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+_GLOBAL(_savegpr_24) stw 24,-32(11)
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+_GLOBAL(_savegpr_25) stw 25,-28(11)
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+_GLOBAL(_savegpr_26) stw 26,-24(11)
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+_GLOBAL(_savegpr_27) stw 27,-20(11)
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+_GLOBAL(_savegpr_28) stw 28,-16(11)
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+_GLOBAL(_savegpr_29) stw 29,-12(11)
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+_GLOBAL(_savegpr_30) stw 30,-8(11)
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+_GLOBAL(_savegpr_31) stw 31,-4(11)
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+ blr
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+
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+/* Routines for restoring integer registers, called by the compiler. */
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+/* Called with r11 pointing to the stack header word of the caller of the */
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+/* function, just beyond the end of the integer restore area. */
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+
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+_GLOBAL(_restgpr_14) lwz 14,-72(11) /* restore gp registers */
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+_GLOBAL(_restgpr_15) lwz 15,-68(11)
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+_GLOBAL(_restgpr_16) lwz 16,-64(11)
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+_GLOBAL(_restgpr_17) lwz 17,-60(11)
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+_GLOBAL(_restgpr_18) lwz 18,-56(11)
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+_GLOBAL(_restgpr_19) lwz 19,-52(11)
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+_GLOBAL(_restgpr_20) lwz 20,-48(11)
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+_GLOBAL(_restgpr_21) lwz 21,-44(11)
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+_GLOBAL(_restgpr_22) lwz 22,-40(11)
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+_GLOBAL(_restgpr_23) lwz 23,-36(11)
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+_GLOBAL(_restgpr_24) lwz 24,-32(11)
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+_GLOBAL(_restgpr_25) lwz 25,-28(11)
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+_GLOBAL(_restgpr_26) lwz 26,-24(11)
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+_GLOBAL(_restgpr_27) lwz 27,-20(11)
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+_GLOBAL(_restgpr_28) lwz 28,-16(11)
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+_GLOBAL(_restgpr_29) lwz 29,-12(11)
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+_GLOBAL(_restgpr_30) lwz 30,-8(11)
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+_GLOBAL(_restgpr_31) lwz 31,-4(11)
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+ blr
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+
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+/* Routines for restoring integer registers, called by the compiler. */
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+/* Called with r11 pointing to the stack header word of the caller of the */
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+/* function, just beyond the end of the integer restore area. */
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+
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+_GLOBAL(_restgpr_14_x) lwz 14,-72(11) /* restore gp registers */
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+_GLOBAL(_restgpr_15_x) lwz 15,-68(11)
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+_GLOBAL(_restgpr_16_x) lwz 16,-64(11)
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+_GLOBAL(_restgpr_17_x) lwz 17,-60(11)
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+_GLOBAL(_restgpr_18_x) lwz 18,-56(11)
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+_GLOBAL(_restgpr_19_x) lwz 19,-52(11)
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+_GLOBAL(_restgpr_20_x) lwz 20,-48(11)
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+_GLOBAL(_restgpr_21_x) lwz 21,-44(11)
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+_GLOBAL(_restgpr_22_x) lwz 22,-40(11)
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+_GLOBAL(_restgpr_23_x) lwz 23,-36(11)
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+_GLOBAL(_restgpr_24_x) lwz 24,-32(11)
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+_GLOBAL(_restgpr_25_x) lwz 25,-28(11)
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+_GLOBAL(_restgpr_26_x) lwz 26,-24(11)
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+_GLOBAL(_restgpr_27_x) lwz 27,-20(11)
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+_GLOBAL(_restgpr_28_x) lwz 28,-16(11)
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+_GLOBAL(_restgpr_29_x) lwz 29,-12(11)
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+_GLOBAL(_restgpr_30_x) lwz 30,-8(11)
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+_GLOBAL(_restgpr_31_x) lwz 0,4(11)
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+ lwz 31,-4(11)
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+ mtlr 0
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+ mr 1,11
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+ blr
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+#endif
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--- a/arch/powerpc/kernel/ppc_ksyms.c
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+++ b/arch/powerpc/kernel/ppc_ksyms.c
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@@ -186,3 +186,114 @@ EXPORT_SYMBOL(__mtdcr);
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EXPORT_SYMBOL(__mfdcr);
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#endif
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EXPORT_SYMBOL(empty_zero_page);
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+
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+#if defined(CONFIG_PPC32) && defined(CONFIG_CC_OPTIMIZE_FOR_SIZE)
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+void _savegpr_14(void);
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+void _savegpr_15(void);
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+void _savegpr_16(void);
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+void _savegpr_17(void);
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+void _savegpr_18(void);
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+void _savegpr_19(void);
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+void _savegpr_20(void);
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+void _savegpr_21(void);
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+void _savegpr_22(void);
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+void _savegpr_23(void);
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+void _savegpr_24(void);
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+void _savegpr_25(void);
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+void _savegpr_26(void);
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+void _savegpr_27(void);
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+void _savegpr_28(void);
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+void _savegpr_29(void);
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+void _savegpr_30(void);
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+void _savegpr_31(void);
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+void _restgpr_14(void);
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+void _restgpr_15(void);
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+void _restgpr_16(void);
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+void _restgpr_17(void);
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+void _restgpr_18(void);
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+void _restgpr_19(void);
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+void _restgpr_20(void);
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+void _restgpr_21(void);
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+void _restgpr_22(void);
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+void _restgpr_23(void);
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+void _restgpr_24(void);
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+void _restgpr_25(void);
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+void _restgpr_26(void);
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+void _restgpr_27(void);
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+void _restgpr_28(void);
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+void _restgpr_29(void);
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+void _restgpr_30(void);
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+void _restgpr_31(void);
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+void _restgpr_14_x(void);
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+void _restgpr_15_x(void);
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+void _restgpr_16_x(void);
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+void _restgpr_17_x(void);
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+void _restgpr_18_x(void);
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+void _restgpr_19_x(void);
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+void _restgpr_20_x(void);
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+void _restgpr_21_x(void);
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+void _restgpr_22_x(void);
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+void _restgpr_23_x(void);
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+void _restgpr_24_x(void);
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+void _restgpr_25_x(void);
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+void _restgpr_26_x(void);
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+void _restgpr_27_x(void);
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+void _restgpr_28_x(void);
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+void _restgpr_29_x(void);
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+void _restgpr_30_x(void);
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+void _restgpr_31_x(void);
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+EXPORT_SYMBOL(_savegpr_14);
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+EXPORT_SYMBOL(_savegpr_15);
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+EXPORT_SYMBOL(_savegpr_16);
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+EXPORT_SYMBOL(_savegpr_17);
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+EXPORT_SYMBOL(_savegpr_18);
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+EXPORT_SYMBOL(_savegpr_19);
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+EXPORT_SYMBOL(_savegpr_20);
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+EXPORT_SYMBOL(_savegpr_21);
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+EXPORT_SYMBOL(_savegpr_22);
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+EXPORT_SYMBOL(_savegpr_23);
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+EXPORT_SYMBOL(_savegpr_24);
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+EXPORT_SYMBOL(_savegpr_25);
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+EXPORT_SYMBOL(_savegpr_26);
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+EXPORT_SYMBOL(_savegpr_27);
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+EXPORT_SYMBOL(_savegpr_28);
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+EXPORT_SYMBOL(_savegpr_29);
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+EXPORT_SYMBOL(_savegpr_30);
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+EXPORT_SYMBOL(_savegpr_31);
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+EXPORT_SYMBOL(_restgpr_14);
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+EXPORT_SYMBOL(_restgpr_15);
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+EXPORT_SYMBOL(_restgpr_16);
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+EXPORT_SYMBOL(_restgpr_17);
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+EXPORT_SYMBOL(_restgpr_18);
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+EXPORT_SYMBOL(_restgpr_19);
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+EXPORT_SYMBOL(_restgpr_20);
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+EXPORT_SYMBOL(_restgpr_21);
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+EXPORT_SYMBOL(_restgpr_22);
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+EXPORT_SYMBOL(_restgpr_23);
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+EXPORT_SYMBOL(_restgpr_24);
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+EXPORT_SYMBOL(_restgpr_25);
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+EXPORT_SYMBOL(_restgpr_26);
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+EXPORT_SYMBOL(_restgpr_27);
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+EXPORT_SYMBOL(_restgpr_28);
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+EXPORT_SYMBOL(_restgpr_29);
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+EXPORT_SYMBOL(_restgpr_30);
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+EXPORT_SYMBOL(_restgpr_31);
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+EXPORT_SYMBOL(_restgpr_14_x);
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+EXPORT_SYMBOL(_restgpr_15_x);
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+EXPORT_SYMBOL(_restgpr_16_x);
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+EXPORT_SYMBOL(_restgpr_17_x);
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+EXPORT_SYMBOL(_restgpr_18_x);
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+EXPORT_SYMBOL(_restgpr_19_x);
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+EXPORT_SYMBOL(_restgpr_20_x);
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+EXPORT_SYMBOL(_restgpr_21_x);
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+EXPORT_SYMBOL(_restgpr_22_x);
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+EXPORT_SYMBOL(_restgpr_23_x);
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+EXPORT_SYMBOL(_restgpr_24_x);
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+EXPORT_SYMBOL(_restgpr_25_x);
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+EXPORT_SYMBOL(_restgpr_26_x);
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+EXPORT_SYMBOL(_restgpr_27_x);
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+EXPORT_SYMBOL(_restgpr_28_x);
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+EXPORT_SYMBOL(_restgpr_29_x);
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+EXPORT_SYMBOL(_restgpr_30_x);
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+EXPORT_SYMBOL(_restgpr_31_x);
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+#endif /* CONFIG_PPC32 && CONFIG_CC_OPTIMIZE_FOR_SIZE */
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