3bec6ded28
Patch from Lennert Buytenhek This patch makes the kernel save Crunch state in userland signal frames, so that any userland signal handler can safely use the Crunch coprocessor without corrupting the Crunch state of the code it preempted. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
#ifndef _ASMARM_UCONTEXT_H
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#define _ASMARM_UCONTEXT_H
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#include <asm/fpstate.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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#ifdef CONFIG_CRUNCH
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#define CRUNCH_MAGIC 0x5065cf03
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#define CRUNCH_STORAGE_SIZE (CRUNCH_SIZE + 8)
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struct crunch_sigframe {
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unsigned long magic;
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unsigned long size;
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struct crunch_state storage;
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} __attribute__((__aligned__(8)));
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#endif
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#ifdef CONFIG_IWMMXT
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/* iwmmxt_area is 0x98 bytes long, preceeded 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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#if __LINUX_ARM_ARCH__ < 6
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/* For ARM pre-v6, we use fstmiax and fldmiax. This adds one extra
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* word after the registers, and a word of padding at the end for
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* alignment. */
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#define VFP_MAGIC 0x56465001
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#define VFP_STORAGE_SIZE 152
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#else
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#define VFP_MAGIC 0x56465002
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#define VFP_STORAGE_SIZE 144
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#endif
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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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union vfp_state storage;
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};
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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_CRUNCH
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struct crunch_sigframe crunch;
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#endif
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#ifdef CONFIG_IWMMXT
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struct iwmmxt_sigframe iwmmxt;
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#endif
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#if 0 && defined CONFIG_VFP /* Not yet saved. */
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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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