1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _ASM_IA64_SIGCONTEXT_H
3 #define _ASM_IA64_SIGCONTEXT_H
4
5 /*
6 * Copyright (C) 1998, 1999, 2001 Hewlett-Packard Co
7 * Copyright (C) 1998, 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com>
8 */
9
10 #include <asm/fpu.h>
11
12 #define IA64_SC_FLAG_ONSTACK_BIT 0 /* is handler running on signal stack? */
13 #define IA64_SC_FLAG_IN_SYSCALL_BIT 1 /* did signal interrupt a syscall? */
14 #define IA64_SC_FLAG_FPH_VALID_BIT 2 /* is state in f[32]-f[127] valid? */
15
16 #define IA64_SC_FLAG_ONSTACK (1 << IA64_SC_FLAG_ONSTACK_BIT)
17 #define IA64_SC_FLAG_IN_SYSCALL (1 << IA64_SC_FLAG_IN_SYSCALL_BIT)
18 #define IA64_SC_FLAG_FPH_VALID (1 << IA64_SC_FLAG_FPH_VALID_BIT)
19
20 # ifndef __ASSEMBLY__
21
22 /*
23 * Note on handling of register backing store: sc_ar_bsp contains the address that would
24 * be found in ar.bsp after executing a "cover" instruction the context in which the
25 * signal was raised. If signal delivery required switching to an alternate signal stack
26 * (sc_rbs_base is not NULL), the "dirty" partition (as it would exist after executing the
27 * imaginary "cover" instruction) is backed by the *alternate* signal stack, not the
28 * original one. In this case, sc_rbs_base contains the base address of the new register
29 * backing store. The number of registers in the dirty partition can be calculated as:
30 *
31 * ndirty = ia64_rse_num_regs(sc_rbs_base, sc_rbs_base + (sc_loadrs >> 16))
32 *
33 */
34
35 struct sigcontext {
36 unsigned long sc_flags; /* see manifest constants above */
37 unsigned long sc_nat; /* bit i == 1 iff scratch reg gr[i] is a NaT */
38 stack_t sc_stack; /* previously active stack */
39
40 unsigned long sc_ip; /* instruction pointer */
41 unsigned long sc_cfm; /* current frame marker */
42 unsigned long sc_um; /* user mask bits */
43 unsigned long sc_ar_rsc; /* register stack configuration register */
44 unsigned long sc_ar_bsp; /* backing store pointer */
45 unsigned long sc_ar_rnat; /* RSE NaT collection register */
46 unsigned long sc_ar_ccv; /* compare and exchange compare value register */
47 unsigned long sc_ar_unat; /* ar.unat of interrupted context */
48 unsigned long sc_ar_fpsr; /* floating-point status register */
49 unsigned long sc_ar_pfs; /* previous function state */
50 unsigned long sc_ar_lc; /* loop count register */
51 unsigned long sc_pr; /* predicate registers */
52 unsigned long sc_br[8]; /* branch registers */
53 /* Note: sc_gr[0] is used as the "uc_link" member of ucontext_t */
54 unsigned long sc_gr[32]; /* general registers (static partition) */
55 struct ia64_fpreg sc_fr[128]; /* floating-point registers */
56
57 unsigned long sc_rbs_base; /* NULL or new base of sighandler's rbs */
58 unsigned long sc_loadrs; /* see description above */
59
60 unsigned long sc_ar25; /* cmp8xchg16 uses this */
61 unsigned long sc_ar26; /* rsvd for scratch use */
62 unsigned long sc_rsvd[12]; /* reserved for future use */
63 /*
64 * The mask must come last so we can increase _NSIG_WORDS
65 * without breaking binary compatibility.
66 */
67 sigset_t sc_mask; /* signal mask to restore after handler returns */
68 };
69
70 # endif /* __ASSEMBLY__ */
71 #endif /* _ASM_IA64_SIGCONTEXT_H */