12c3dca25d
The MaverickCrunch support for ep93xx never made it into glibc and was removed from gcc in its 4.8 release in 2012. It is now one of the last parts of arch/arm/ that fails to build with the clang integrated assembler, which is unlikely to ever want to support it. The two alternatives are to force the use of binutils/gas when building the crunch support, or to remove it entirely. According to Hartley Sweeten: "Martin Guy did a lot of work trying to get the maverick crunch working but I was never able to successfully use it for anything. It "kind" of works but depending on the EP93xx silicon revision there are still a number of hardware bugs that either give imprecise or garbage results. I have no problem with removing the kernel support for the maverick crunch." Unless someone else comes up with a good reason to keep it around, remove it now. This touches mostly the ep93xx platform, but removes a bit of code from ARM common ptrace and signal frame handling as well. If there are remaining users of MaverickCrunch, they can use LTS kernels for at least another five years before kernel support ends. Link: https://lore.kernel.org/linux-arm-kernel/20210802141245.1146772-1-arnd@kernel.org/ Link: https://lore.kernel.org/linux-arm-kernel/20210226164345.3889993-1-arnd@kernel.org/ Link: https://github.com/ClangBuiltLinux/linux/issues/1272 Link: https://gcc.gnu.org/legacy-ml/gcc/2008-03/msg01063.html Cc: "Martin Guy" <martinwguy@martinwguy@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASMARM_UCONTEXT_H
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#define _ASMARM_UCONTEXT_H
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#include <asm/fpstate.h>
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#include <asm/user.h>
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/*
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* struct sigcontext only has room for the basic registers, but struct
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* ucontext now has room for all registers which need to be saved and
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* restored. Coprocessor registers are stored in uc_regspace. Each
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* coprocessor's saved state should start with a documented 32-bit magic
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* number, followed by a 32-bit word giving the coproccesor's saved size.
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* uc_regspace may be expanded if necessary, although this takes some
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* coordination with glibc.
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*/
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struct ucontext {
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unsigned long uc_flags;
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struct ucontext *uc_link;
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stack_t uc_stack;
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask;
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/* Allow for uc_sigmask growth. Glibc uses a 1024-bit sigset_t. */
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int __unused[32 - (sizeof (sigset_t) / sizeof (int))];
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/* Last for extensibility. Eight byte aligned because some
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coprocessors require eight byte alignment. */
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unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
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};
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#ifdef __KERNEL__
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/*
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* Coprocessor save state. The magic values and specific
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* coprocessor's layouts are part of the userspace ABI. Each one of
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* these should be a multiple of eight bytes and aligned to eight
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* bytes, to prevent unpredictable padding in the signal frame.
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*/
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/*
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* Dummy padding block: if this magic is encountered, the block should
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* be skipped using the corresponding size field.
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*/
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#define DUMMY_MAGIC 0xb0d9ed01
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#ifdef CONFIG_IWMMXT
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/* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */
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#define IWMMXT_MAGIC 0x12ef842a
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#define IWMMXT_STORAGE_SIZE (IWMMXT_SIZE + 8)
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struct iwmmxt_sigframe {
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unsigned long magic;
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unsigned long size;
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struct iwmmxt_struct storage;
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} __attribute__((__aligned__(8)));
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#endif /* CONFIG_IWMMXT */
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#ifdef CONFIG_VFP
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#define VFP_MAGIC 0x56465001
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struct vfp_sigframe
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{
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unsigned long magic;
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unsigned long size;
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struct user_vfp ufp;
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struct user_vfp_exc ufp_exc;
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} __attribute__((__aligned__(8)));
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/*
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* 8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc,
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* 4 bytes padding.
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*/
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#define VFP_STORAGE_SIZE sizeof(struct vfp_sigframe)
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#endif /* CONFIG_VFP */
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/*
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* Auxiliary signal frame. This saves stuff like FP state.
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* The layout of this structure is not part of the user ABI,
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* because the config options aren't. uc_regspace is really
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* one of these.
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*/
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struct aux_sigframe {
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#ifdef CONFIG_IWMMXT
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struct iwmmxt_sigframe iwmmxt;
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#endif
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#ifdef CONFIG_VFP
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struct vfp_sigframe vfp;
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#endif
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/* Something that isn't a valid magic number for any coprocessor. */
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unsigned long end_magic;
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} __attribute__((__aligned__(8)));
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#endif
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#endif /* !_ASMARM_UCONTEXT_H */
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