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git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4440 3c298f89-4303-0410-b956-a3cf2f4a3e73
271 lines
10 KiB
Plaintext
271 lines
10 KiB
Plaintext
Note... modified my mjn3 to not conflict with the big endian arm patch.
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Warning!!! Only the linux target is aware of TARGET_ENDIAN_DEFAULT.
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Also changed
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#define SUBTARGET_EXTRA_ASM_SPEC "\
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%{!mcpu=*:-mcpu=xscale} \
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%{mhard-float:-mfpu=fpa} \
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%{!mhard-float: %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}}"
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to
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#define SUBTARGET_EXTRA_ASM_SPEC "\
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%{mhard-float:-mfpu=fpa} \
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%{!mhard-float: %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}}"
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in gcc/config/arm/linux-elf.h.
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#
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# Submitted:
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#
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# Dimitry Andric <dimitry@andric.com>, 2004-05-01
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#
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# Description:
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#
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# Nicholas Pitre released this patch for gcc soft-float support here:
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# http://lists.arm.linux.org.uk/pipermail/linux-arm/2003-October/006436.html
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#
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# This version has been adapted to work with gcc 3.4.0.
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#
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# The original patch doesn't distinguish between softfpa and softvfp modes
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# in the way Nicholas Pitre probably meant. His description is:
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#
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# "Default is to use APCS-32 mode with soft-vfp. The old Linux default for
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# floats can be achieved with -mhard-float or with the configure
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# --with-float=hard option. If -msoft-float or --with-float=soft is used then
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# software float support will be used just like the default but with the legacy
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# big endian word ordering for double float representation instead."
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#
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# Which means the following:
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#
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# * If you compile without -mhard-float or -msoft-float, you should get
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# software floating point, using the VFP format. The produced object file
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# should have these flags in its header:
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#
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# private flags = 600: [APCS-32] [VFP float format] [software FP]
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#
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# * If you compile with -mhard-float, you should get hardware floating point,
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# which always uses the FPA format. Object file header flags should be:
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#
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# private flags = 0: [APCS-32] [FPA float format]
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#
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# * If you compile with -msoft-float, you should get software floating point,
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# using the FPA format. This is done for compatibility reasons with many
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# existing distributions. Object file header flags should be:
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#
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# private flags = 200: [APCS-32] [FPA float format] [software FP]
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#
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# The original patch from Nicholas Pitre contained the following constructs:
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#
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# #define SUBTARGET_EXTRA_ASM_SPEC "%{!mcpu=*:-mcpu=xscale} \
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# %{mhard-float:-mfpu=fpa} \
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# %{!mhard-float: %{msoft-float:-mfpu=softfpa;:-mfpu=softvfp}}"
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#
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# However, gcc doesn't accept this ";:" notation, used in the 3rd line. This
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# is probably the reason Robert Schwebel modified it to:
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#
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# #define SUBTARGET_EXTRA_ASM_SPEC "%{!mcpu=*:-mcpu=xscale} \
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# %{mhard-float:-mfpu=fpa} \
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# %{!mhard-float: %{msoft-float:-mfpu=softfpa -mfpu=softvfp}}"
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#
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# But this causes the following behaviour:
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#
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# * If you compile without -mhard-float or -msoft-float, the compiler generates
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# software floating point instructions, but *nothing* is passed to the
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# assembler, which results in an object file which has flags:
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#
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# private flags = 0: [APCS-32] [FPA float format]
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#
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# This is not correct!
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#
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# * If you compile with -mhard-float, the compiler generates hardware floating
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# point instructions, and passes "-mfpu=fpa" to the assembler, which results
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# in an object file which has the same flags as in the previous item, but now
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# those *are* correct.
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#
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# * If you compile with -msoft-float, the compiler generates software floating
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# point instructions, and passes "-mfpu=softfpa -mfpu=softvfp" (in that
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# order) to the assembler, which results in an object file with flags:
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#
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# private flags = 600: [APCS-32] [VFP float format] [software FP]
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#
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# This is not correct, because the last "-mfpu=" option on the assembler
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# command line determines the actual FPU convention used (which should be FPA
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# in this case).
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#
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# Therefore, I modified this patch to get the desired behaviour. Every
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# instance of the notation:
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#
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# %{msoft-float:-mfpu=softfpa -mfpu=softvfp}
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#
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# was changed to:
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#
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# %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}
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#
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# I also did the following:
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#
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# * Modified all TARGET_DEFAULT macros I could find to include ARM_FLAG_VFP, to
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# be consistent with Nicholas' original patch.
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# * Removed any "msoft-float" or "mhard-float" from all MULTILIB_DEFAULTS
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# macros I could find. I think that if you compile without any options, you
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# would like to get the defaults. :)
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# * Removed the extra -lfloat option from LIBGCC_SPEC, since it isn't needed
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# anymore. (The required functions are now in libgcc.)
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diff -urN gcc-3.4.1-old/gcc/config/arm/coff.h gcc-3.4.1/gcc/config/arm/coff.h
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--- gcc-3.4.1-old/gcc/config/arm/coff.h 2004-02-24 08:25:22.000000000 -0600
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+++ gcc-3.4.1/gcc/config/arm/coff.h 2004-09-02 21:51:15.000000000 -0500
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@@ -31,11 +31,16 @@
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#define TARGET_VERSION fputs (" (ARM/coff)", stderr)
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#undef TARGET_DEFAULT
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-#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME | ARM_FLAG_MMU_TRAPS)
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+#define TARGET_DEFAULT \
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+ ( ARM_FLAG_SOFT_FLOAT \
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+ | ARM_FLAG_VFP \
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+ | ARM_FLAG_APCS_32 \
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+ | ARM_FLAG_APCS_FRAME \
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+ | ARM_FLAG_MMU_TRAPS )
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#ifndef MULTILIB_DEFAULTS
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#define MULTILIB_DEFAULTS \
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- { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork" }
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+ { "marm", "mlittle-endian", "mapcs-32", "mno-thumb-interwork" }
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#endif
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/* This is COFF, but prefer stabs. */
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diff -urN gcc-3.4.1-old/gcc/config/arm/elf.h gcc-3.4.1/gcc/config/arm/elf.h
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--- gcc-3.4.1-old/gcc/config/arm/elf.h 2004-02-24 08:25:22.000000000 -0600
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+++ gcc-3.4.1/gcc/config/arm/elf.h 2004-09-02 21:51:15.000000000 -0500
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@@ -46,7 +46,9 @@
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#ifndef SUBTARGET_ASM_FLOAT_SPEC
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#define SUBTARGET_ASM_FLOAT_SPEC "\
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-%{mapcs-float:-mfloat} %{msoft-float:-mfpu=softfpa}"
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+%{mapcs-float:-mfloat} \
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+%{mhard-float:-mfpu=fpa} \
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+%{!mhard-float: %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}}"
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#endif
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#ifndef ASM_SPEC
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@@ -106,12 +108,17 @@
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#endif
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#ifndef TARGET_DEFAULT
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-#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME | ARM_FLAG_MMU_TRAPS)
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+#define TARGET_DEFAULT \
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+ ( ARM_FLAG_SOFT_FLOAT \
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+ | ARM_FLAG_VFP \
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+ | ARM_FLAG_APCS_32 \
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+ | ARM_FLAG_APCS_FRAME \
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+ | ARM_FLAG_MMU_TRAPS )
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#endif
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#ifndef MULTILIB_DEFAULTS
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#define MULTILIB_DEFAULTS \
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- { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
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+ { "marm", "mlittle-endian", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
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#endif
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#define TARGET_ASM_FILE_START_APP_OFF true
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diff -urN gcc-3.4.1-old/gcc/config/arm/linux-elf.h gcc-3.4.1/gcc/config/arm/linux-elf.h
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--- gcc-3.4.1-old/gcc/config/arm/linux-elf.h 2004-09-02 21:50:52.000000000 -0500
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+++ gcc-3.4.1/gcc/config/arm/linux-elf.h 2004-09-02 22:00:49.000000000 -0500
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@@ -44,12 +44,26 @@
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#define TARGET_LINKER_EMULATION "armelf_linux"
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#endif
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-/* Default is to use APCS-32 mode. */
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+/*
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+ * Default is to use APCS-32 mode with soft-vfp.
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+ * The old Linux default for floats can be achieved with -mhard-float
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+ * or with the configure --with-float=hard option.
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+ * If -msoft-float or --with-float=soft is used then software float
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+ * support will be used just like the default but with the legacy
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+ * big endian word ordering for double float representation instead.
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+ */
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#undef TARGET_DEFAULT
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-#define TARGET_DEFAULT \
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- ( ARM_FLAG_APCS_32 | \
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- ARM_FLAG_MMU_TRAPS | \
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- TARGET_ENDIAN_DEFAULT )
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+#define TARGET_DEFAULT \
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+ ( ARM_FLAG_APCS_32 \
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+ | ARM_FLAG_SOFT_FLOAT \
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+ | TARGET_ENDIAN_DEFAULT \
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+ | ARM_FLAG_VFP \
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+ | ARM_FLAG_MMU_TRAPS )
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+
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+#undef SUBTARGET_EXTRA_ASM_SPEC
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+#define SUBTARGET_EXTRA_ASM_SPEC "\
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+%{mhard-float:-mfpu=fpa} \
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+%{!mhard-float: %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}}"
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#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
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@@ -57,7 +71,7 @@
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#undef MULTILIB_DEFAULTS
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#define MULTILIB_DEFAULTS \
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- { "marm", TARGET_ENDIAN_OPTION, "mhard-float", "mapcs-32", "mno-thumb-interwork" }
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+ { "marm", TARGET_ENDIAN_OPTION, "mapcs-32", "mno-thumb-interwork" }
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#define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
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@@ -72,7 +86,7 @@
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%{shared:-lc} \
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%{!shared:%{profile:-lc_p}%{!profile:-lc}}"
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-#define LIBGCC_SPEC "%{msoft-float:-lfloat} -lgcc"
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+#define LIBGCC_SPEC "-lgcc"
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/* Provide a STARTFILE_SPEC appropriate for GNU/Linux. Here we add
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the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
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diff -urN gcc-3.4.1-old/gcc/config/arm/t-linux gcc-3.4.1/gcc/config/arm/t-linux
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--- gcc-3.4.1-old/gcc/config/arm/t-linux 2003-09-20 16:09:07.000000000 -0500
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+++ gcc-3.4.1/gcc/config/arm/t-linux 2004-09-02 21:51:15.000000000 -0500
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@@ -4,7 +4,10 @@
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LIBGCC2_DEBUG_CFLAGS = -g0
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LIB1ASMSRC = arm/lib1funcs.asm
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-LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx
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+LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx \
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+ _negdf2 _addsubdf3 _muldivdf3 _cmpdf2 _unorddf2 _fixdfsi _fixunsdfsi \
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+ _truncdfsf2 _negsf2 _addsubsf3 _muldivsf3 _cmpsf2 _unordsf2 \
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+ _fixsfsi _fixunssfsi
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# MULTILIB_OPTIONS = mhard-float/msoft-float
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# MULTILIB_DIRNAMES = hard-float soft-float
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diff -urN gcc-3.4.1-old/gcc/config/arm/unknown-elf.h gcc-3.4.1/gcc/config/arm/unknown-elf.h
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--- gcc-3.4.1-old/gcc/config/arm/unknown-elf.h 2004-02-24 08:25:22.000000000 -0600
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+++ gcc-3.4.1/gcc/config/arm/unknown-elf.h 2004-09-02 21:51:15.000000000 -0500
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@@ -30,7 +30,12 @@
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/* Default to using APCS-32 and software floating point. */
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#ifndef TARGET_DEFAULT
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-#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME | ARM_FLAG_MMU_TRAPS)
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+#define TARGET_DEFAULT \
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+ ( ARM_FLAG_SOFT_FLOAT \
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+ | ARM_FLAG_VFP \
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+ | ARM_FLAG_APCS_32 \
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+ | ARM_FLAG_APCS_FRAME \
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+ | ARM_FLAG_MMU_TRAPS )
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#endif
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/* Now we define the strings used to build the spec file. */
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diff -urN gcc-3.4.1-old/gcc/config/arm/xscale-elf.h gcc-3.4.1/gcc/config/arm/xscale-elf.h
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--- gcc-3.4.1-old/gcc/config/arm/xscale-elf.h 2003-07-01 18:26:43.000000000 -0500
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+++ gcc-3.4.1/gcc/config/arm/xscale-elf.h 2004-09-02 21:51:15.000000000 -0500
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@@ -49,11 +49,12 @@
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endian, regardless of the endian-ness of the memory
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system. */
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-#define SUBTARGET_EXTRA_ASM_SPEC "%{!mcpu=*:-mcpu=xscale} \
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- %{mhard-float:-mfpu=fpa} \
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- %{!mhard-float: %{msoft-float:-mfpu=softfpa;:-mfpu=softvfp}}"
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+#define SUBTARGET_EXTRA_ASM_SPEC "\
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+%{!mcpu=*:-mcpu=xscale} \
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+%{mhard-float:-mfpu=fpa} \
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+%{!mhard-float: %{msoft-float:-mfpu=softfpa} %{!msoft-float:-mfpu=softvfp}}"
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#ifndef MULTILIB_DEFAULTS
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#define MULTILIB_DEFAULTS \
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- { "mlittle-endian", "mno-thumb-interwork", "marm", "msoft-float" }
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+ { "mlittle-endian", "mno-thumb-interwork", "marm" }
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#endif
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