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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm/include/asm/ucontext.h | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | arch/arm/include/asm/ucontext.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/arm/include/asm/ucontext.h b/arch/arm/include/asm/ucontext.h new file mode 100644 index 000000000..4048c92d9 --- /dev/null +++ b/arch/arm/include/asm/ucontext.h @@ -0,0 +1,96 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASMARM_UCONTEXT_H +#define _ASMARM_UCONTEXT_H + +#include <asm/fpstate.h> +#include <asm/user.h> + +/* + * struct sigcontext only has room for the basic registers, but struct + * ucontext now has room for all registers which need to be saved and + * restored. Coprocessor registers are stored in uc_regspace. Each + * coprocessor's saved state should start with a documented 32-bit magic + * number, followed by a 32-bit word giving the coproccesor's saved size. + * uc_regspace may be expanded if necessary, although this takes some + * coordination with glibc. + */ + +struct ucontext { + unsigned long uc_flags; + struct ucontext *uc_link; + stack_t uc_stack; + struct sigcontext uc_mcontext; + sigset_t uc_sigmask; + /* Allow for uc_sigmask growth. Glibc uses a 1024-bit sigset_t. */ + int __unused[32 - (sizeof (sigset_t) / sizeof (int))]; + /* Last for extensibility. Eight byte aligned because some + coprocessors require eight byte alignment. */ + unsigned long uc_regspace[128] __attribute__((__aligned__(8))); +}; + +#ifdef __KERNEL__ + +/* + * Coprocessor save state. The magic values and specific + * coprocessor's layouts are part of the userspace ABI. Each one of + * these should be a multiple of eight bytes and aligned to eight + * bytes, to prevent unpredictable padding in the signal frame. + */ + +/* + * Dummy padding block: if this magic is encountered, the block should + * be skipped using the corresponding size field. + */ +#define DUMMY_MAGIC 0xb0d9ed01 + +#ifdef CONFIG_IWMMXT +/* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */ +#define IWMMXT_MAGIC 0x12ef842a +#define IWMMXT_STORAGE_SIZE (IWMMXT_SIZE + 8) + +struct iwmmxt_sigframe { + unsigned long magic; + unsigned long size; + struct iwmmxt_struct storage; +} __attribute__((__aligned__(8))); +#endif /* CONFIG_IWMMXT */ + +#ifdef CONFIG_VFP +#define VFP_MAGIC 0x56465001 + +struct vfp_sigframe +{ + unsigned long magic; + unsigned long size; + struct user_vfp ufp; + struct user_vfp_exc ufp_exc; +} __attribute__((__aligned__(8))); + +/* + * 8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc, + * 4 bytes padding. + */ +#define VFP_STORAGE_SIZE sizeof(struct vfp_sigframe) + +#endif /* CONFIG_VFP */ + +/* + * Auxiliary signal frame. This saves stuff like FP state. + * The layout of this structure is not part of the user ABI, + * because the config options aren't. uc_regspace is really + * one of these. + */ +struct aux_sigframe { +#ifdef CONFIG_IWMMXT + struct iwmmxt_sigframe iwmmxt; +#endif +#ifdef CONFIG_VFP + struct vfp_sigframe vfp; +#endif + /* Something that isn't a valid magic number for any coprocessor. */ + unsigned long end_magic; +} __attribute__((__aligned__(8))); + +#endif + +#endif /* !_ASMARM_UCONTEXT_H */ |