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 */ 72